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Sample records for caffer teleostei gobiidae

  1. Evidence for panmixia despite barriers to gene flow in the southern African endemic, Caffrogobius caffer (Teleostei: Gobiidae

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    von der Heyden Sophie

    2008-12-01

    Full Text Available Abstract Background Oceanography and life-history characteristics are known to influence the genetic structure of marine species, however the relative role that these factors play in shaping phylogeographic patterns remains unresolved. The population genetic structure of the endemic, rocky shore dwelling Caffrogobius caffer was investigated across a known major oceanographic barrier, Cape Agulhas, which has previously been shown to strongly influence genetic structuring of South African rocky shore and intertidal marine organisms. Given the variable and dynamic oceanographical features of the region, we further sought to test how the pattern of gene flow between C. caffer populations is affected by the dominant Agulhas and Benguela current systems of the southern oceans. Results The variable 5' region of the mtDNA control region was amplified for 242 individuals from ten localities spanning the distributional range of C. caffer. Fifty-five haplotypes were recovered and in stark contrast to previous phylogeographic studies of South African marine species, C. caffer showed no significant population genetic structuring along 1300 km of coastline. The parsimony haplotype network, AMOVA and SAMOVA analyses revealed panmixia. Coalescent analyses reveal that gene flow in C. caffer is strongly asymmetrical and predominantly affected by the Agulhas Current. Notably, there was no gene flow between the east coast and all other populations, although all other analyses detect no significant population structure, suggesting a recent divergence. The mismatch distribution suggests that C. caffer underwent a population expansion at least 14 500 years ago. Conclusion We propose several possible life-history adaptations that could have enabled C. caffer to maintain gene flow across its distributional range, including a long pelagic larval stage. We have shown that life-history characteristics can be an important contributing factor to the phylogeography of marine

  2. The importance of gobies (Gobiidae, Teleostei) as hosts and transmitters of parasites in the SW Baltic

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    Zander, C. D.; Strohbach, U.; Groenewold, S.

    1993-02-01

    The parasite fauna of five goby species (Gobiidae, Teleostei) was investigated in the Baltic Sea during the period 1987 to 1990. 13 parasite species were found in samples from the Lübeck Bight: Bothriocephalus scorpii, Schistocephalus sp. (Cestoda); Cryptocotyle concavum, Cryptocotyle lingua, Podocotyle atomon, Derogenes varicus (Digenea); Hysterothylacium sp. (cf. auctum), Contracaecum sp., Anisakis simplex (Nematoda); Corynosoma sp., Echinorhynchus gadi, Neoechinorhynchus rutili, Pomphorhynchus laevis (Acanthocephala). The number of parasite species were: 10 in the sand goby Pomatoschistus minutus, 8 in the black goby Gobius niger, 7 in the two-spotted goby Gobiusculus flavescens, 6 in the common goby Pomatoschistus microps, and 5 in the painted goby Pomatoschistus pictus. Neoechinorhynchus rutili occurred only in P. minutus, and Corynosoma sp. only in G. niger. The extent to which the gobies were parasitized clearly depended on the respective ways of life and, moreover, on the kind of prey ingested by the hosts. Additionally, the age of the hosts might be important. The highest rate of parasitism, more than 60%, was reached by Hysterothylacium sp. in G. niger and by Cryptocotyle concavum in P. microps. Infestation incidence lay mostly below 40% which means a satellite species status (Holmes, 1991). The number of parasite species was highest in summer; the highest intensities of single parasites occurred in spring ( Podocotyle atomon) or autumn ( Crytocotyle concavum). Bothriocephalus scorpii, Hysterothylacium sp. and Podocotyle infested their juvenile hosts very early, but only Hysterothylacium was accumulated by G. niger during its whole life span, whereas Bothriocephalus persisted also in older gobies in low intensities. The cercariae of Cryptocotyle spp. penetrate actively into their hosts; all the other parasites named were transmitted in larval form by prey organisms which consisted mainly of planktonic and benthic crustaceans. The gobies were final hosts

  3. Evolution of microhabitat association and morphology in a diverse group of cryptobenthic coral reef fishes (Teleostei: Gobiidae: Eviota)

    KAUST Repository

    Tornabene, Luke

    2013-01-01

    Gobies (Teleostei: Gobiidae) are an extremely diverse and widely distributed group and are the second most species rich family of vertebrates. Ecological drivers are key to the evolutionary success of the Gobiidae. However, ecological and phylogenetic data are lacking for many diverse genera of gobies. Our study investigated the evolution of microhabitat association across the phylogeny of 18 species of dwarfgobies (genus Eviota), an abundant and diverse group of coral reef fishes. In addition, we also explore the evolution of pectoral fin-ray branching and sensory head pores to determine the relationship between morphological evolution and microhabitat shifts. Our results demonstrate that Eviota species switched multiple times from a facultative hard-coral association to inhabiting rubble or mixed sand/rubble habitat. We found no obvious relationship between microhabitat shifts and changes in pectoral fin-ray branching or reduction in sensory pores, with the latter character being highly homoplasious throughout the genus. The relative flexibility in coral-association in Eviota combined with the ability to move into non-coral habitats suggests a genetic capacity for ecological release in contrast to the strict obligate coral-dwelling relationship commonly observed in closely related coral gobies, thus promoting co-existence through fine scale niche partitioning. The variation in microhabitat association may facilitate opportunistic ecological speciation, and species persistence in the face of environmental change. This increased speciation opportunity, in concert with a high resilience to extinction, may explain the exceptionally high diversity seen in Eviota compared to related genera in the family. © 2012 Elsevier Inc.

  4. A NEW FRESHWATER GOBY (TELEOSTEI: GOBIIDAE) FROM THE ...

    African Journals Online (AJOL)

    M. pongoiensis fits with the following characters in the description of this genus as given by Koumans (1931), and Roxas & Ablan. (1940): D VI + 18; Al8; body elongate; 27-37 ctenoid scales laterally. Head scaled above behind eyes and on upper parts of opercles. Eyes on anterior half of head. Anterior nostril in a short tube.

  5. The systematic position of Unio Caffer

    African Journals Online (AJOL)

    but have concentric beak sculpture (Ortmann 1916; Woodward 1965; personally verified). Unlike those of Unio caffer, however, the glochidia of those species of Hyriopsis Conrad,. Lamellidens Simpson and Uniandra Haas, all of the Oriental region, are of subovate shape. (height always greater than length) and lack hooks.

  6. Listeric septicaemia and abotion in African buffalo ( Syncerus caffer ...

    African Journals Online (AJOL)

    Listeria monocytogenes infection is insidious in mammals and systemic cases have been reported. We report an unusual clinical case and manifestation of Listeria monocytogenes infection in an African buffalo (Syncerus caffer) culminating in septicemia and abortion. The infection was unsuspected but only diagnosed by ...

  7. Study of Loma acerinae (Microsporidia) detected from three Ponto-Caspian gobies (Gobiidae) in Ukraine.

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    Ovcharenko, Mykola; Wróblewski, Piotr; Kvach, Yuriy; Drobiniak, Oleksandra

    2017-05-01

    A previously recognized Glugea-belonging Microsporidia (G. melanostomi, G. markievichi, G. naidenovi) were found in the intestinal mucosa of Neogobius melanostomus, N. fluviatilis, and Proterorhinchus semilunaris (Teleostei, Gobiidae) from lower Dnieper River and Black Sea coastal inlets, Ukraine. Light microscope observations demonstrated small spherical xenomes about 0.35 mm in diameter filled by developmental stages of parasites. Mature spores were ellipsoidal, slightly narrowed at anterior pole, sometimes ovoid or elongate in shape approximately 3.1-4.5 × 2.0-2.9 μm in size. The stained spores were elongate ovoid that are measured about 2.3-4.3 × 1.6-3.4 μm. Ultrastructural study showed that xenoma wall consisted of finely granular layer up to 350 nm wide. Numerous host-derived collagenous fibers adhered to the xenoma wall were noticed. Microtubular inclusions about 40 nm in diameter occupied the episporontal space. Mature spores displayed the polar filament arranged in one row. One to two last turns of polar filament were sharply tapered to half of diameter. The number of polar filament turns varied depending of host infected from 10 (9 + 1) in N. melanostomus to 13 (11 + 2) in N. fluviatilis and 14 (13 + 1) in P. semilunaris. The endospore thickness varied depending of host infected from 30-35 nm in case of N. fluviatiis to 40-50 nm in P. semilunaris and 60-80 nm in N. melanostomus. SSU 16S rRNA sequence analysis, blast searches, and ultrastuctural data revealed similarity of all studied microsporidians with Loma acerinae (Jirovec, 1930).

  8. Larval development of Evermannia zosterura (Perciformes: Gobiidae).

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    González-Navarro, Enrique; Saldierna-Martínez, Ricardo Javier; Aceves-Medina, Gerardo

    2014-06-01

    Gobiidae is the most specious fish family in the world with almost 2 000 species, however only 11% of them have been described for their larval stages. The entire life cycle information is essential to understand the biology and ecology of this important fish group. Previous studies on zooplankton samples from Ensenada de La Paz, México, have shown the presence of several Gobiidae larvae and juveniles which were identified as Evermania zosterura. The main objective of this work was to describe the larval stages of this species, widely distributed in the Eastern tropical Pacific. The development of E. zosterura larvae was described based on 66 specimens. A total of 53 specimens were used to describe morphometrics and pigmentation patterns, while 13 specimens were cleared and stained, to obtain meristic characteristics. Cleared specimens had 30 to 31 total vertebrae; dorsal-fin elements: IV; 1, 13-14, anal-fin elements: 1, 13-14, and most had pterygiophore formula 4-111100. The combination of these characteristics confirmed these specimens as E. zosterura. The pigment pattern is similar throughout ontogeny. Larvae are characterized by having three to five dendritic melanophores along the post-anal ventral margin, four to nine smaller melanophores along the ventral margin between the isthmus and anus, and one on the midpoint of the dorsal margin of the tail. There is one small pigment spot on the angle of the jaw, and other on the tip of lower lip. There is an elongated internal pigment under the notochord, between the head and gas bladder. Notochord flexion starts near 3.5mm BL and ends at 4.6mm BL; transformalion to the juvenile stage is at about 13.6mm BL. Our conclusion is that the most useful characters to distinguish this species early-larval stages from those of similar species in the area, are the number of myomeres, the large melanophores (approximately uniformly in size) on the post anal ventral margin, and the elongate internal pigment under the notochord

  9. Do invasive bighead goby Neogobius kessleri and round goby N. melanostomus (Teleostei, Gobiidae compete for food?

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    Števove B.

    2013-08-01

    Full Text Available Bighead goby (Neogobius kessleri and round goby (Neogobius melanostomus have been invading new non-native areas about two decades successfully. In this study, diet spectrum, seasonal variation, feeding strategy and diet overlap between these two invasive species were assessed. Materials were collected from the Danube at Bratislava by fishing rods and/or electrofishing. The diet spectrum of both species was diverse: a total of 46 food types in bighead goby and 51food types in round goby were observed. Dikerogammarus sp., chironomid larvae and Corophium sp. were the most predominant food types in bighead goby, whereas in round goby, chironomid larvae, Corophium sp., bryozoans and Cladocera predominated. The diet varied over seasons. In the Slovak part of the Danube, bighead goby and round goby have adapted to local food resources, consuming diverse food from small to large items, both with soft and/or hard body. This enhances the capability of these invasive species to spread successfully. It appears that even if both exploit similar food resources, their proportional content differs. Further differences between these gobies were also found in their food behaviour and feeding strategy. Both species tend to be specialists where possible, but round goby demonstrates higher flexibility towards general feeding strategy.

  10. Lebetus scorpioides and Buenia jeffreysii (Teleostei: Gobiidae found north of the Arctic Circle

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    Ingvar Byrkjedal

    2016-05-01

    Full Text Available Two gobiid species, Lebetus scorpioides and Buenia jeffreysii, were recorded in northern Norway, for the first time north of the Arctic Circle. While both species were found on the continental shelf west of the Lofoten islands, one of them, L. scorpioides, was found north of 70°N off western Finnmark. The records represent a considerable northward extension of the distribution of these species. Being well within the size of reproductive individuals, the specimens appear to belong to resident populations most probably missed by earlier samplings.

  11. Eviota santanai, a new Dwarfgoby from Timor-Leste (Teleostei: Gobiidae).

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    Greenfield, David W; Erdmann, Mark V

    2013-11-29

    Eviota santanai is described based on four specimens from Timor-Leste, taken in 5-8 m depth. In general coloration pattern, the species is most similar to E. latifasciata, but differs in the cephalic sensory-pore system pattern, the absence of an occipital spot, and live color including pinkish-mauve bars. Eviota santanai has a dorsal/anal fin-ray formula of 8/8, 5th pelvic-fin ray absent, some lower pectoral-fin rays branched, and IT and PITO pores absent.

  12. Diet of Ctenogobius shufeldti (Jordan and Eigenmann, 1887 (Teleostei, Gobiidae in Guaratuba Bay, subtropical west Atlantic

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    Diego Zanlorenzi

    2011-02-01

    Full Text Available The diet composition of the American freshwater goby, Ctenogobius shufeldti, was investigated in an estuarine area and two of its tributaries. 397 individuals, total length from 21 to 70mm, were sampled over a period of 12 months and their stomach contents were analysed by the Frequency of Occurrence and Number of Points methods. According to the Alimentary Index, diet was constituted mainly by Ostracoda (IA=50.51 and Tanaidacea (IA=40.85, and secondarily by Gastropoda (IA=1.21, Amphipoda (IA=0.10, Isopoda (IA=0.01, Cirripedia (IA=0.01, Decapoda larvae (IA=0.01, Insecta (IA=0.01, Chlorophyta (IA=2.15 and Rodophyta (IA=0.15 filamentous algae, and plants (IA=4.99. Diversity of diet was higher in rivers than in the Bay. Except for Decapoda larvae, items found in the two rivers were the same. In the Bay, Amphipoda and Cirripedia were not found. Previous to this research, the filamentous algae Chlorophyta and Rodophyta had not been noted in the diet of this species in estuaries close to Guaratuba. In view of this, and regarding the possible roles played by cryptobenthic fish species in aquatic communities (Depczynski and Bellwood, 2003, it is concluded that C. shufeldti takes part in trophic dynamics feeding on benthic organisms as well as on algae, a behaviour that can result from both marine and continental influences existing in the region.

  13. In vitro production of cattlexbuffalo hybrid embryos using cattle oocytes and African buffalo (Syncerus caffer caffer) epididymal sperm.

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    Owiny, O D; Barry, D M; Agaba, M; Godke, R A

    2009-04-01

    Interspecies hybridization of bovids occurs between domestic cattle and at least three other species; American bison (Bison bison), yak (Bos grunniens) and banteng (Bos banteng). Birth of a cattlexbuffalo (Bubalus bubalis) hybrid has reportedly occurred in Russia and in China, but these reports were not authenticated. Such hybrids could be important in improving livestock production and management of diseases that impede production in tropical Africa. This study investigated hybridization between cattle and its closest African wild bovid relative, the African buffalo (Syncerus caffer caffer). In an attempt to produce cattlexbuffalo hybrid embryos in vitro, matured cattle oocytes were subjected to a standard in vitro fertilization (IVF) procedure with either homologous cattle (n=1166 oocytes) or heterologous African buffalo (n=1202 oocytes) frozen-thawed epididymal sperm. After IVF, 67.2% of the oocytes inseminated with the homologous cattle sperm cleaved. In contrast, fertilization with buffalo sperm resulted in only a 4.6% cleavage rate. The cleavage intervals were also slower in hybrid embryos than in the IVF-derived cattle embryos. Of the cleaved homologous cattle embryos 52.2% progressed to the morula stage compared with 12.7% for the buffalo hybrid embryos. No hybrid embryos developed beyond the early morula stage, while 40.1% of the cleaved cattlexcattle embryos developed to the blastocyst stage. Transfer of buffalo hybrid IVF embryos to domestic cattle surrogates resulted in no pregnancies at 60 days post-transfer. This study indicates that interspecies fertilization of cattle oocytes with African buffalo epididymal sperm can occur in vitro, and that a barrier to hybridization occurs in the early stages of embryonic development. Chromosomal disparity is likely the cause of the fertilization abnormalities, abnormal development and subsequent arrest impairing the formation of hybrid embryos beyond the early morula stage. Transfer of the buffalo hybrid embryos

  14. The adrenal gland of the African buffalo, Syncerus caffer: a light and ...

    African Journals Online (AJOL)

    1992-02-13

    Feb 13, 1992 ... Although the histology of the adrenal gland of many mammals, particularly domestic animals, is known, the histology of that of the African buffalo, SyncenJs caffer, has not been described previously. Tissue from seven male and female adult buffalo was processed for light and electron microscopy.

  15. Complete mitochondrial genome of the mudskipper Boleophthalmus boddarti (Perciformes, Gobiidae).

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    Zhang, Yu Ting; Ghaffar, Mazlan Abd; Li, Zhe; Chen, Wei; Chen, Shi Xi; Hong, Wan Shu

    2016-01-01

    The Boddart's goggle-eyed mudskipper, Boleophthalmus boddarti (Perciformes, Gobiidae) is an amphibious fish, inhabiting brackish waters of estuaries and builds burrows in soft mud along the intertidal zone. In this paper, the complete mitochondrial genome sequence of B. boddarti was firstly determined. The circle genome (16,727 bp) comprises 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes and 1 control region. The overall base composition of B. boddarti is 29.1% for C, 28.9% for A, 25.9% for T, and 16.0% for G, with a slight A + T bias of 54.8%. The termination-associated sequence, conserved sequence block domains, and a 131-bp tandem repeat were found in the control region. It has the typical vertebrate mitochondrial gene arrangement.

  16. Pollution biomonitoring in the Bizerte lagoon (Tunisia), using combined chemical and biomarker analyses in grass goby, Zosterisessor ophiocephalus (Teleostei, Gobiidae).

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    Barhoumi, Badreddine; Clérandeau, Christelle; Gourves, Pierre-Yves; Le Menach, Karyn; El Megdiche, Yassine; Peluhet, Laurent; Budzinski, Hélène; Baudrimont, Magalie; Driss, Mohamed Ridha; Cachot, Jérôme

    2014-10-01

    In this study, biological responses and contaminant levels in biological tissues were investigated in grass goby fish specimens (Zosterisessor ophiocephalus) collected from five stations in a moderately polluted ecosystem, namely the Bizerte lagoon on the north coast of Tunisia. The following biomarkers were measured: muscular acetylcholinesterase (AChE), hepatic ethoxyresorufin-O-deethylase (EROD), glutathione-S-transferase (GST), catalase (CAT), lipoperoxidation (TBARS), condition factor (CF), and hepatosomatic index (HSI). These measurements were taken in parallel with the content of Organochlorine pesticides (OCPs), Polychlorinated biphenyls (PCBs), Polycyclic aromatic hydrocarbons (PAHs) and trace metals (As, Cr, Cu, Mn, Pb, V, Zn, Ag, Cd, Co and Ni) in muscle tissue. Total PAH concentrations ranged from 20.09 ± 0.68 to 105.77 ± 42.58 ng g(-1) dw, PCB from 33.19 ± 6.25 to 126.28 ± 7.37 ng g(-1) dw, OCP from 11.26 ± 1.62 to 19.17 ± 2.06 ng g(-1) dw, and metals from 107.83 ± 1.83 to 187.21 ± 2.00 mg/kg dw. The highest levels of pollutants and biomarkers were observed at station S1, located in the Bizerte channel. Elevated EROD, GST and CAT activities, as well as TBARS levels in liver were positively correlated with tissue contaminant levels at station S1. Significant negative correlations were also found between hexachlorobenzene (HCB) and dichlorodiphenyltrichloroethane (DDTs) body burden with AChE activity in muscle at station S2. The integration of biological responses and contaminant tissue content indicated that certain areas of the Bizerte lagoon, notably station S1, are significantly impacted by various human activities, which likely represent a threat for aquatic wildlife. On the basis of these results, and due to its ecological characteristics, the grass goby appears a suitable indicator species for pollution biomonitoring in coastal marine areas along the Mediterranean Sea. Copyright © 2014 Elsevier Ltd. All rights reserved.

  17. First evidence for interspecific hybridization between invasive goby species Neogobius fluviatilis and Neogobius melanostomus (Teleostei: Gobiidae: Benthophilinae).

    Science.gov (United States)

    Lindner, K; Cerwenka, A F; Brandner, J; Gertzen, S; Borcherding, J; Geist, J; Schliewen, U K

    2013-06-01

    Two hybrids between the monkey goby Neogobius fluviatilis and the round goby Neogobius melanostomus from the Rhine River were identified by genotyping and morphological comparison. These are the first records of goby-hybrids outside the parent species' native ranges worldwide. © 2013 The Authors. Journal of Fish Biology © 2013 The Fisheries Society of the British Isles.

  18. Age and growth of Crystallogobius linearis (von Düben, 1845 (Teleostei: Gobiidae from the Adriatic Sea

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    M. La Mesa

    2001-12-01

    Full Text Available Age and growth of the crystal goby Crystallogobius linearis (von Düben, 1845 were investigated by means of daily growth increment counts on the sagittal otoliths. Samples of C. linearis, obtained as by-catch of the Aphia minuta fishery, were collected in a coastal area of the central Adriatic Sea between March and September 1996. Otolith age-readings were carried out on 167 specimens, ranged from 14 to 41 mm of total length, and indicated that the population was composed of individuals from two to seven months old. Growth of both males and females appeared practically linear over the whole size range studied, although in females a slight decrease in growth rate of older specimens was observed. Furthermore, the hatch date distribution of C. linearis, obtained by the backcalculation of the ageing data, indicated a long breeding season of at least eight months. The results of this study indicated that, as reported from literature for most nektonic gobies, the crystal goby is also characterised by a short life span, during which a high reproductive effort is displayed throughout a long breeding season.

  19. Taxonomical and morphological notes on two species of mudskippers, Periophthalmus walailakae and Periophthalmodon schlosseri (Teleostei: Gobiidae) from Singapore.

    Science.gov (United States)

    Jaafar, Zeehan; Lim, Kelvin K P; Chou, Loke Ming

    2006-11-01

    The mudskipper Periophthalmus walailakae is recorded from Singapore, where it was previously misidentified as Periophthalmodon schlosseri, with which it is syntopic. Periophthalmus walailakae is distinguished from its congeners by the following combination of characters: pelvic fins completely united and shaped like a disk, and first dorsal fin dark brown or black, with a rounded posterior edge and a white distal margin. This species most closely resembles Pn. schlosseri but has one row of teeth on the upper jaw, scales on the isthmus, and a different upper lip and jaw morphology. Contrary to an earlier report, scales are present on the snout, interorbital, and isthmus of Ps. walailakae. The two species can also be distinguished by size, external morphology, and body color patterns.

  20. Varicus lacerta, a new species of goby (Teleostei, Gobiidae, Gobiosomatini, Nes subgroup) from a mesophotic reef in the southern Caribbean.

    Science.gov (United States)

    Tornabene, Luke; Robertson, D Ross; Baldwin, Carole C

    2016-01-01

    We describe a new species of goby, Varicus lacerta sp. n., which was collected from a mesophotic reef at Curacao, southern Caribbean. The new species is the tenth species of Varicus, all of which occur below traditional SCUBA depths in the wider Caribbean area. Its placement in the genus Varicus is supported by a molecular phylogenetic analysis of three nuclear genes and the mitochondrial gene cytochrome b. In addition, the new species has one anal-fin pterygiophore inserted anterior to the first haemal spine, which distinguishes Varicus species from most species in the closely related and morphologically similar genus Psilotris. Varicus lacerta sp. n. is distinguished from all other named species of Varicus by the absence of scales, having highly branched, feather-like pelvic-fin rays, and in its live coloration. We provide the cytochrome c oxidase I DNA barcode of the holotype and compare color patterns of all species of Varicus and Psilotris for which color photographs or illustrations are available. This study is one of several recent studies demonstrating the utility of manned submersibles in exploring the diversity of poorly studied but species-rich deep-reef habitats.

  1. A new mesophotic goby, Palatogobius incendius (Teleostei: Gobiidae, and the first record of invasive lionfish preying on undescribed biodiversity.

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    Luke Tornabene

    Full Text Available A new species of deep-reef fish in the goby genus Palatogobius is described from recent submersible collections off Curaçao and Dominica. Video footage of schools of this species reveal predation by the invasive Indo-Pacific lionfish (Pterois spp., the first record of undescribed fauna potentially being eaten by lionfish outside of its native range. We present molecular phylogenetic data for all valid species of Palatogobius and related genera, as well as a taxonomic key to the species of Palatogobius and a generic key to Palatogobius and related genera in the western Atlantic. Lastly, we discuss ecological and behavioral aspects of some deep-reef fishes in light of potential threats from invasive lionfish.

  2. A new mesophotic goby, Palatogobius incendius (Teleostei: Gobiidae), and the first record of invasive lionfish preying on undescribed biodiversity.

    Science.gov (United States)

    Tornabene, Luke; Baldwin, Carole C

    2017-01-01

    A new species of deep-reef fish in the goby genus Palatogobius is described from recent submersible collections off Curaçao and Dominica. Video footage of schools of this species reveal predation by the invasive Indo-Pacific lionfish (Pterois spp.), the first record of undescribed fauna potentially being eaten by lionfish outside of its native range. We present molecular phylogenetic data for all valid species of Palatogobius and related genera, as well as a taxonomic key to the species of Palatogobius and a generic key to Palatogobius and related genera in the western Atlantic. Lastly, we discuss ecological and behavioral aspects of some deep-reef fishes in light of potential threats from invasive lionfish.

  3. Taxonomic and ecological notes on Buenia affinis Iljin 1930 (Pisces: Gobiidae)

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    Costa, F.; Giacobbe, S.; Salpietro, L. [S. Agata, Messina, Univ. (Italy). Facolta` di Scienze. Dipt. di Biologia Animale ed Ecologia Marina

    1996-12-31

    Taxonomic and ecological notes on Buenia affinis Iljin 1930 (Pisces: Gobiidae). A population of the rare Teleost Buenia affinis Iljin 1930 has been sampled in a brackish pool along the Sicilian Tyrrhenic coastline. A description of the taxonomic features as well as first observations on the ecology of the species are given in detail.

  4. Pan-African Genetic Structure in the African Buffalo (Syncerus caffer): Investigating Intraspecific Divergence

    Science.gov (United States)

    Smitz, Nathalie; Berthouly, Cécile; Cornélis, Daniel; Heller, Rasmus; Van Hooft, Pim; Chardonnet, Philippe; Caron, Alexandre; Prins, Herbert; van Vuuren, Bettine Jansen; De Iongh, Hans; Michaux, Johan

    2013-01-01

    The African buffalo (Syncerus caffer) exhibits extreme morphological variability, which has led to controversies about the validity and taxonomic status of the various recognized subspecies. The present study aims to clarify these by inferring the pan-African spatial distribution of genetic diversity, using a comprehensive set of mitochondrial D-loop sequences from across the entire range of the species. All analyses converged on the existence of two distinct lineages, corresponding to a group encompassing West and Central African populations and a group encompassing East and Southern African populations. The former is currently assigned to two to three subspecies (S. c. nanus, S. c. brachyceros, S. c. aequinoctialis) and the latter to a separate subspecies (S. c. caffer). Forty-two per cent of the total amount of genetic diversity is explained by the between-lineage component, with one to seventeen female migrants per generation inferred as consistent with the isolation-with-migration model. The two lineages diverged between 145 000 to 449 000 years ago, with strong indications for a population expansion in both lineages, as revealed by coalescent-based analyses, summary statistics and a star-like topology of the haplotype network for the S. c. caffer lineage. A Bayesian analysis identified the most probable historical migration routes, with the Cape buffalo undertaking successive colonization events from Eastern toward Southern Africa. Furthermore, our analyses indicate that, in the West-Central African lineage, the forest ecophenotype may be a derived form of the savanna ecophenotype and not vice versa, as has previously been proposed. The African buffalo most likely expanded and diverged in the late to middle Pleistocene from an ancestral population located around the current-day Central African Republic, adapting morphologically to colonize new habitats, hence developing the variety of ecophenotypes observed today. PMID:23437100

  5. Field application of immunoassays for the detection of Mycobacterium bovis infection in the African buffalo (Syncerus caffer)

    NARCIS (Netherlands)

    van der Heijden, E.M.D.L.; Jenkins, A.; Cooper, D.; Rutten, V.P.M.G.; Michel, A.L.

    2016-01-01

    The African buffalo (Syncerus caffer) is considered the most important maintenance host of bovine tuberculosis (BTB) in wildlife in Southern Africa. The diagnosis of Mycobacterium bovis infection in this species mostly relies on the single intradermal comparative tuberculin test (SICTT). As an

  6. Complete mitochondrial genome sequence of Tridentiger bifasciatus and Tridentiger barbatus (Perciformes, Gobiidae): a mitogenomic perspective on the phylogenetic relationships of Gobiidae.

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    Jin, Xiaoxiao; Wang, Rixin; Wei, Tao; Tang, Da; Xu, Tianjun

    2015-01-01

    The fishes of suborder Gobioidei is the largest group of those in present living Perciformes, which contains about 2,200 species belonging to 270 genera of 9 families in the world. The monophyly and phylogenetic relationships of gobies have been controversial and disputable for a long time. In the present study, the complete mitochondrial genome of the shimofuri goby Tridentiger bifasciatus (T. bifasciatus) and shokihaze goby Tridentiger barbatus (T. barbatus) were firstly determined. The two mitochondrial genomes were both consisted of 2 ribosomal RNA (rRNA) genes, 13 protein-coding genes, 22 transfer RNA (tRNA) genes, and one major control region (CR). They shared similar features with those of other gobies in terms of gene arrangement, base composition, and tRNA structures. The CR was absence of typical conserved blocks (CSB-E, and CSB-F) respectively for the T. bifasciatus and T. barbatus. Phylogenomic analyses, which based on 12 concatenated protein-coding genes and complete mitochondrial genome sequences, revealed that there were two groups within the Gobiidae. A large group consisted of the Amblyopinae, Gobionellinae, Oxudercinae and Sicydiinae, and Amblyopinae was nested in Oxudercinae and they were both paraphyletic to Sicydiinae. The other group was the Gobiinae. As a whole, our phylogenetic data was different from the traditionally classification of Gobiidae, but supported the new phylogenetic taxonomy view of Thacker (Copeia 2009:93-104, 2009).

  7. Competitive relationship between members of the Gobiidae family and other fish species of waters of Pridneprovye region

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    V. V. Khobot

    2014-09-01

    Full Text Available The paper analyzes the species’ composition of Gobiidae, their quantitative and qualitative parameters in the coastal zone of the Pridneproovye water bodies. The structural and functional features of organization of coastal Gobies groups in the explored territory have been investigated, as well as characteristics of spatial arrangement of Gobiidae family representatives in water bodies and rivers and their role in the coastal groups of fishes. In the waters of Dnipropetrovsk region there were recorded 8 species of the Gobies family: round goby Neogobius melanostomus (Pallas, 1814, big-headed goby N. kessleri (Gunter, 1861, monkey goby N. fluviatilis (Pallas, 1814, goad goby N. gymnotrachelus (Kessler, 1857, toad goby Mesogobius batrachocephalus (Pallas, 1814, tube-nosed goby Proterorhinus marmoratus (Pallas, 1814, starry goby Benthophilus stellatus (Sauvage, 1874, Brauner’s tadpole goby Benthophiloides brauneri (Beling et Iljin, 1927. The gobies are quickly settled in various water bodies. The highest numbers of Gobiidae were registered in Dneprovsky water basin – 113.8 specimens/100 m2. The dominant among the Gobiidae is monkey goby, and subdominant is round goby. The main food competitor of monkey goby are juveniles of commercial fish. In Samara river the index of trophic niche overlap between goby and roach reaches 0.95, between goby and silver bream – 0.91, between goby and crucian carp – 0.88, between goby and rudd – 0.87, between goby and common bream – 0.62. The number and biomass indicators in Samara river have fallen due to trophic competition between new aggressive fish species – pumpkinseed and Gobiidae. In the Ingulets river the total overlap of trophic niches is observed between N. fluviatilis and black-striped pipefish (1.0, almost complete overlap is recorded between monkey goby and pumpkinseed (0.97. It is found that native species of Dnipropetrovsk region (including commercial species undergo intense trophic

  8. Disease constraints for utilization of the African buffalo (Syncerus caffer) on game ranches in Zambia.

    Science.gov (United States)

    Munang'andu, Hetron M; Munag'andu, Hetron M; Siamudaala, Victor M; Nambota, Andrew; Bwalya, John M; Munyeme, Musso; Mweene, Aaron S; Takada, Ayato; Kida, Hiroshi

    2006-05-01

    Eco-tourism depending on wildlife is becoming increasingly profitable and landowners are beginning to favor game farming and ecotourism. In these areas, large-scale translocation of wildlife involves a diversity of species and large populations. The African buffalo (Syncerus caffer) is one of the major tourist attractions in Zambia. It accounts for 8.7% and 12.4% of the total animal species hunted in the Game Management Areas and the total hunting revenue earned in Zambia, respectively. It is ecologically an important animal species essential for the purpose of habitat control and facilitating the provision of suitable grazing pastures. However, the rearing of the African buffalo on game ranches has been hampered by its carrier state of the Southern Africa Terroritory (SAT) serotypes of foot and mouth disease virus (FMD). The African buffalo is also known to be a carrier of Theileria parva lawrencei, the causative agent of corridor disease (CD) that continues to have devastating effects on the livestock industry in Zambia. In addition, the importation of buffaloes from countries with populations endemic to bovine tuberculosis is highly restricted. Veterinary regulations in Zambia, strongly advocate against the translocation of buffaloes from protected areas to private ranches for disease control purposes thereby mounting a considerable constraint on the economic and ecological viability of the industry. It is hoped that this review will motivate the relevant government authorities in exploiting ways in which this animal species play a central role in eco-tourism.

  9. Food and feeding ecology of Tylochromis jentinki (Teleostei ...

    African Journals Online (AJOL)

    Food and feeding ecology of Tylochromis jentinki (Teleostei: Cichlidae) in Ebrié Lagoon, Ivory Coast, with emphasis on spatial, size and temporal variation in fish ... being mostly insectivorous, while subadults (97–122 mm SL) and adults (>122 mm SL) were mainly omnivorous, with larger individuals feeding on larger prey.

  10. Histological changes in the gills of Clarias gariepinus (Teleostei ...

    African Journals Online (AJOL)

    Histological changes in the gills of Clarias gariepinus (Teleostei: Clariidae) from a polluted South African urban aquatic system. ... A semi-quantitative histological assessment was used to investigate histological changes in the gills of Clarias gariepinus from Marais Dam and Rietvlei Dam near Pretoria, which receive ...

  11. The role of African buffalos (Syncerus caffer) in the maintenance of foot-and-mouth disease in Uganda

    DEFF Research Database (Denmark)

    Ayebazibwe, C.; Mwiine, F. N.; Tjørnehøj, Kirsten

    2010-01-01

    Background To study the role of African buffalos (Syncerus caffer) in the maintenance of foot-and-mouth disease in Uganda, serum samples were collected from 207 African buffalos, 21 impalas (Aepyceros melampus), 1 giraffe (Giraffa camelopardalis), 1 common eland (Taurotragus oryx), 7 hartebeests...... (Alcelaphus buselaphus) and 5 waterbucks (Kobus ellipsiprymnus) from four major National Parks in Uganda between 2005 and 2008. Serum samples were screened to detect antibodies against foot-and-mouth disease virus (FMDV) non-structural proteins (NSP) using the Ceditest FMDV NS ELISA. Solid Phase Blocking...

  12. Midazolam / ketamine induction and isoflurane maintenance of anaesthesia in a 2-month-old, hand-raised African buffalo (Syncerus caffer : clinical communication

    Directory of Open Access Journals (Sweden)

    G.F. Stegmann

    2004-06-01

    Full Text Available The use of a midazolam / ketamine combination for induction of anaesthesia in a 2-month-old, hand-raised buffalo calf (Syncerus caffer described to allow endotracheal intubation for the maintenance of anaesthesia with isoflurane and oxygen. Intraoperative complications were hypotension and hypothermia. For postoperative analgesia meloxicam and butorphanol was administered intramuscularly.

  13. Antibodies Against Foot-and-mouth Disease (FMD) Virus in African Buffalos (Syncerus caffer) in Selected National Parks in Uganda (2001–2003)

    DEFF Research Database (Denmark)

    Ayebazibwe, C.; Mwiine, F. N.; Balinda, S. N.

    2010-01-01

    In East Africa, the foot-and-mouth disease (FMD) virus (FMDV) isolates have over time included serotypes O, A, C, Southern African Territories (SAT) 1 and SAT 2, mainly from livestock. SAT 3 has only been isolated in a few cases and only in African buffalos (Syncerus caffer). To investigate...

  14. Potential effects of prescribed savannah burning on the diet selection of forest buffalo (Syncerus caffer nanus) in Lopé National Park, Gabon

    NARCIS (Netherlands)

    Hoek, van der Y.; Lustenhouwer, I.; Jeffery, K.J.; Hooft, van W.F.

    2013-01-01

    Seasonality and management are factors that may affect the diet selection of the forest buffalo (Syncerus caffer nanus). Fire is considered a major driving force in savannah systems and prescribed burning is a commonly applied conservation tool in protected areas such as Lopé National Park, Gabon.

  15. Multi-locus sequence data reveal a new species of coral reef goby (Teleostei: Gobiidae: Eviota), and evidence of Pliocene vicariance across the Coral Triangle.

    Science.gov (United States)

    Tornabene, L; Valdez, S; Erdmann, M V; Pezold, F L

    2016-05-01

    Here, multi-locus sequence data are coupled with observations of live colouration to recognize a new species, Eviota punyit from the Coral Triangle, Indian Ocean and Red Sea. Relaxed molecular clock divergence time estimation indicates a Pliocene origin for the new species, and the current distribution of the new species and its sister species Eviota sebreei supports a scenario of vicariance across the Indo-Pacific Barrier, followed by subsequent range expansion and overlap in the Coral Triangle. These results are consistent with the 'centre of overlap' hypothesis, which states that the increased diversity in the Coral Triangle is due in part to the overlapping ranges of Indian Ocean and Pacific Ocean faunas. These findings are discussed in the context of other geminate pairs of coral reef fishes separated by the Indo-Pacific Barrier. © 2016 The Fisheries Society of the British Isles.

  16. Evaluation of genotoxicity using the micronucleus assay and nuclear abnormalities in the tropical sea fish Bathygobius soporator (Valenciennes, 1837 (Teleostei, Gobiidae

    Directory of Open Access Journals (Sweden)

    Toni P. Galindo

    2009-01-01

    Full Text Available The micronucleus and nuclear abnormalities assays have been used increasingly to evaluate genotoxicity of many compounds in polluted aquatic ecossystems. The aim of this study is to verify the efficiency of the micronucleus assay and nuclear abnormality assay in field and laboratory work, when using erythrocytes of the tropical marine fish Bathygobius soporator as genotoxicity biomarkers. Gill peripheral blood samples were obtained from specimens of Bathygobius soporator. In order to investigate the frequencies of micronuclei and to assess the sensitivity of species, the results were compared with samples taken at the reference site and maintained in the laboratory, and fish treated with cyclophosphamide. The micronucleus assay was efficient in demonstrating field pollution and reproducing results in the labotatory. There were significant higher frequencies of micronuclei in two sites subject to discharge of urban and industrial effluents. The nuclear abnormality assay did not appear to be an efficient tool for genotoxicity evaluation when compared with field samples taken at a reference site in laboratory, with a positive control.

  17. Anticipation of Artemia sp. supply in the larviculture of the barber goby Elacatinus figaro (Gobiidae: Teleostei influenced growth, metamorphosis and alkaline protease activity

    Directory of Open Access Journals (Sweden)

    Maria Fernanda da Silva-Souza

    2015-09-01

    Full Text Available The barber goby Elacatinus figaro is considered endangered due to overexploitation by the ornamental industry. Farming marine ornamental fishes, especially the threatened ones, can be one of the measures to minimize the pressure on the natural stocks. Among the priority issues for their production is the determination of the most appropriate feeding management. The feeding protocol commonly used in the larviculture of barber goby, when the start of Artemia sp. offer occurred at the 18th DAH (days after hatching (treatment T18, was modified, by anticipating brine shrimp supply in 6 days (treatment T12. Alkaline proteases activity, growth and metamorphosis of larvae were evaluated in both protocols. Juveniles at T12 showed higher weight (0.04 ± 0.001 g and lower activity of total alkaline proteases (1.3 ± 0.2 mU mg-1 protein compared to T18 (0.02 ± 0.001 g; 2.8 ± 0.4 mU mg-1 protein, respectively. With anticipation of brine shrimp, the commencing and end of larval transformation was observed earlier (at 24 and 34 DAH, respectively in comparison to those with the supply of Artemia sp. at 18 DAH (27 and 41 DAH, respectively. Thus, the Artemia sp. anticipation was beneficial during the larviculture of the barber goby, considering that larvae reached metamorphosis earlier.

  18. A new, mesophotic Coryphopterus goby (Teleostei, Gobiidae) from the southern Caribbean, with comments on relationships and depth distributions within the genus.

    Science.gov (United States)

    Baldwin, Carole C; Robertson, D Ross

    2015-01-01

    A new species of western Atlantic Coryphopterus is described from mesophotic depths off Curaçao, southern Caribbean. Coryphopteruscurasub sp. n., is similar to Coryphopterusdicrus in, among other features, having two prominent pigment spots of roughly equal intensity on the pectoral-fin base, the pelvic fins fused to form a disk, and no pelvic frenum. The two species can be differentiated by body depth (shallower in Coryphopteruscurasub at origin of dorsal fin and caudal peduncle); differences in the pigmentation on the head, trunk, and basicaudal region; and usually by total number of rays (spinous plus soft) in the second dorsal fin (10-11, usually 11, in Coryphopteruscurasub, 10 in Coryphopterusdicrus). Coryphopteruscurasub differs from other Coryphopterus species that have a prominent pigment spot on the lower portion of the pectoral-fin base (Coryphopteruspunctipectophorus and Coryphopterusvenezuelae) in, among other features, lacking a pelvic frenum. Coryphopteruscurasub was collected between 70 and 80 m, the deepest depth range known for the genus. Collections of Coryphopterusvenezuelae at depths of 65-69 m extend the depth range of that species by approximately 50 m. Mitochondrial cytochrome c oxidase subunit I (COI) data corroborate the recognition of Coryphopteruscurasub as a distinct species but do not rigorously resolve its relationships within the genus. A revised key to the western Atlantic species of Coryphopterus is presented.

  19. A new, mesophotic Coryphopterus goby (Teleostei, Gobiidae from the southern Caribbean, with comments on relationships and depth distributions within the genus

    Directory of Open Access Journals (Sweden)

    Carole C. Baldwin

    2015-07-01

    Full Text Available A new species of western Atlantic Coryphopterus is described from mesophotic depths off Curaçao, southern Caribbean. Coryphopterus curasub sp. n., is similar to C. dicrus in, among other features, having two prominent pigment spots of roughly equal intensity on the pectoral-fin base, the pelvic fins fused to form a disk, and no pelvic frenum. The two species can be differentiated by body depth (shallower in C. curasub at origin of dorsal fin and caudal peduncle; differences in the pigmentation on the head, trunk, and basicaudal region; and usually by total number of rays (spinous plus soft in the second dorsal fin (10–11, usually 11, in C. curasub, 10 in C. dicrus. Coryphopterus curasub differs from other Coryphopterus species that have a prominent pigment spot on the lower portion of the pectoral-fin base (C. punctipectophorus and C. venezuelae in, among other features, lacking a pelvic frenum. Coryphopterus curasub was collected between 70 and 80 m, the deepest depth range known for the genus. Collections of C. venezuelae at depths of 65–69 m extend the depth range of that species by approximately 50 m. Mitochondrial cytochrome c oxidase subunit I (COI data corroborate the recognition of C. curasub as a distinct species but do not rigorously resolve its relationships within the genus. A revised key to the western Atlantic species of Coryphopterus is presented.

  20. Tick-borne haemoparasites in African buffalo (Syncerus caffer) from two wildlife areas in Northern Botswana.

    Science.gov (United States)

    Eygelaar, Dewald; Jori, Ferran; Mokopasetso, Mokganedi; Sibeko, Kgomotso P; Collins, Nicola E; Vorster, Ilse; Troskie, Milana; Oosthuizen, Marinda C

    2015-01-15

    The African buffalo (Syncerus caffer) is a host for many pathogens known to cause economically important diseases and is often considered an important reservoir for livestock diseases. Theileriosis, heartwater, babesiosis and anaplasmosis are considered the most important tick-borne diseases of livestock in sub-Saharan Africa, resulting in extensive economic losses to livestock farmers in endemic areas. Information on the distribution of tick-borne diseases and ticks is scarce in Northern Botswana. Nevertheless, this data is necessary for targeting surveillance and control measures in livestock production at national level. In order to address this gap, we analyzed 120 blood samples from buffalo herds for the presence of common tick-borne haemoparasites causing disease in livestock, collected in two of the main wildlife areas of Northern Botswana: the Chobe National Park (CNP, n=64) and the Okavango Delta (OD, n=56). Analysis of the reverse line blot (RLB) hybridization assay results revealed the presence of Theileria, Babesia, Anaplasma and Ehrlichia species, either as single or mixed infections. Among the Theileria spp. present, T. parva (60%) and T. mutans (37%) were the most prevalent. Other species of interest were Anaplasma marginale subsp. centrale (30%), A. marginale (20%), Babesia occultans (23%) and Ehrlichia ruminantium (6%). The indirect fluorescent antibody test (IFAT) indicated 74% of samples to be positive for the presence of T. parva antibodies. Quantitative real-time PCR (qPCR) detected the highest level of animals infected with T. parva (81% of the samples). The level of agreement between the tests for detection of T. parva positive animals was higher between qPCR and IFAT (kappa=0.56), than between qPCR and RLB (kappa=0.26) or the latter and IFAT (kappa=0.15). This is the first report of tick-borne haemoparasites in African buffalo from northern Botswana, where animals from the CNP showed higher levels of infection than those from OD. Considering

  1. Nematodes of the small intestine of African buffaloes, Syncerus caffer, in the Kruger National Park, South Africa

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    William A. Taylor

    2013-03-01

    Full Text Available The abundance and distribution of parasitic helminths in populations of African buffaloes, Syncerus caffer, have not been well documented. A total of 28 buffaloes of different ages and sexeswere sampled in the Kruger National Park, South Africa, for nematodes of the small intestine. Three nematode species were identified, namely Cooperia fuelleborni, Cooperia hungi and Trichostrongylus deflexus, with C. hungi being a new country record for African buffalo in South Africa. The overall prevalence was 71%and the average number of worms was 2346 (range: 0–15 980. This is a small burden for such a large mammal. Sex, age and body condition of the buffaloes had no significant effect on worm occurrence.

  2. Seasonal habitat selection by African buffalo Syncerus caffer in the Savuti–Mababe–Linyanti ecosystem of northern Botswana

    Directory of Open Access Journals (Sweden)

    Keoikantse Sianga

    2017-05-01

    Full Text Available This study aimed to establish seasonal movement and habitat selection patterns of African buffalo Syncerus caffer in relation to a detailed habitat map and according to seasonal changes in forage quality and quantity in the Savuti–Mababe–Linyanti ecosystem (Botswana. Two buffalo were collared in November 2011 and another in October 2012. All three buffalo had greater activities in the mopane–sandveld woodland mosaic during the wet season, which provided high-quality leafy grasses and ephemeral water for drinking, but moved to permanent water and reliable forage of various wetlands (swamps and floodplains and riverine woodlands during the dry season. Wetlands had higher grass greenness, height and biomass than woodlands during the dry season. Buffalo had similar wet season concentration areas in the 2011–2012 and 2012–2013 wet seasons and similar dry season concentration areas over the 2012 and 2013 dry seasons. However, their dry season location of collaring in 2011 differed dramatically from their 2012 and 2013 dry season concentration areas, possibly because of the exceptionally high flood levels in 2011, which reduced accessibility to their usual dry season concentration areas. The study demonstrates that extremely large and heterogeneous landscapes are needed to conserve buffalo in sandy, dystrophic ecosystems with variable rainfall.Conservation implications: This study emphasises the importance of large spatial scale available for movement, which enables adaptation to changing conditions between years and seasons.

  3. A preliminary investigation of tuberculosis and other diseases in African buffalo (Syncerus caffer in Queen Elizabeth National Park, Uganda

    Directory of Open Access Journals (Sweden)

    G. Kalema-Zikusoka

    2005-09-01

    Full Text Available A survey to determine the prevalence of bovine tuberculosis caused by Mycobacterium bovis and certain other infectious diseases was conducted on 42 free-ranging African buffaloes, (Syncerus caffer from May to June 1997 in the Queen Elizabeth National Park, Uganda. Using the gamma interferon test, exposure to M. bovis was detected in 21.6 % of the buffaloes. One dead buffalo and an emaciated warthog (Phacochoerus aethiopicus that was euthanased, were necropsied; both had miliary granulomas from which M. bovis was isolated. None of the buffaloes sampled in Sector A of the park, which has no cattle interface, tested positive for bovine tuberculosis (BTB exposure. The prevalence and distribution of BTB does not appear to have changed significantly since the 1960s, but this may be due to fluxes in the buffalo population. Serological testing for foot-and-mouth disease (FMD demonstrated positive exposure of 57.1% of the buffaloes sampled, with types A, O and SAT 1-3, which is the first known report of FMD antibodies to A and O types in free ranging African buffaloes. Foot-and-mouth disease virus types SAT 1 and SAT 3 were isolated from buffalo probang samples. Two percent of the buffaloes had been exposed to brucellosis. None of the buffaloes tested had antibodies to rinderpest, leptospirosis or Q fever.

  4. Characterisation of recent foot-and-mouth disease viruses from African buffalo ( Syncerus caffer )and cattle in Kenya is consistent with independent virus populations

    DEFF Research Database (Denmark)

    Nabalayo Wekesa, Sabenzia; Kiprotich Sangula, Abraham; Belsham, Graham

    2015-01-01

    Background Understanding the epidemiology of foot-and-mouth disease (FMD), including roles played by different hosts, is essential for improving disease control. The African buffalo (Syncerus caffer) is a reservoir for the SAT serotypes of FMD virus (FMDV). Large buffalo populations commonly...... intermingle with livestock in Kenya, yet earlier studies have focused on FMD in the domestic livestock, hence the contribution of buffalo to disease in livestock is largely unknown. This study analysed 47 epithelia collected from FMD outbreaks in Kenyan cattle between 2008 and 2012, and 102 probang and serum...

  5. Annual reproductive cycle and fecundity of Scorpaena notata (Teleostei, Scorpaenidae

    Directory of Open Access Journals (Sweden)

    Marta Muñoz

    2005-12-01

    Full Text Available Scorpaena notata (Teleostei: Scorpaenidae is an oviparous species with external fertilisation that shows some unusual features in its gonadal morphology and gametogenesis. In this work we analyse the annual reproductive cycle and the fecundity of this species by studying the monthly histological changes in the gonads and of various indices related to reproduction. Sexual dimorphism does not occur in the population we studied, which is clearly dominated by males. Multiple spawning takes place between July and October, consisting of between 6,000 and 33,000 eggs per female, each of about 500 µm in diameter. The fecundity of the species is determined by the size and weight of the individuals

  6. Parasites gastro-intestinaux d'antilopes et de buffles (Syncerus caffer brachyceros du ranch de gibier de Nazinga au Burkina Faso

    Directory of Open Access Journals (Sweden)

    Belem AMG.

    2009-01-01

    Full Text Available Gastro-intestinal parasites of antelopes and buffalos (Syncerus caffer brachyceros from the Nazinga game ranch in Burkina Faso. Parasitological survey done on the digestive tracts of antelopes [roans (Hippotragus equinus koba, hartebeests (Alcelaphus buselaphus major, defassa waterbucks (Kobus ellipsiprymnus defassa, oribis (Ourebia ourebi quadriscopa] and buffalos (Syncerus caffer brachyceros from the Nazinga game ranch in Burkina Faso allowed the identification of gastrointestinal parasites and the estimation of their prevalence and load. Nine different nematode species and three cestode species were found. Females and larvae of Cooperia were not identified up to the species level and were recognized as Cooperia spp. The nematode species found were: Haemonchus contortus, Trichostrongylus axei, Cooperia curticei, Cooperia spatulata, Skrjabinema sp., Trichostrongylus colubriformis, Trichuris ovis, Bunostomum phlebotomum, and Oesophagostomum sp. Cestodes’ species were: Moniezia expansa, Avitellina centripunctata, and Stilesia globipunctata. It was also noted without a thorough investigation the presence of Setaria labiato-papillosa in the abdominal cavity and paramphistomes in the rumen. In spite of the presence of parasites on the antelopes and buffalos, their killing out percentages (47.5 to 54.7% indicated a good physical status.

  7. Global Journal of Pure and Applied Sciences - Vol 16, No 4 (2010)

    African Journals Online (AJOL)

    linnaeus 1760) (teleostei, Gobiidae) in the estuarine swamps of the Imo river, Nigeria · EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. L Etim, FN Olele, MT Udo, II Brownson, 395-400 ...

  8. Sahyadria, a new genus of barbs (Teleostei: Cyprinidae from Western Ghats of India

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    R. Raghavan

    2013-11-01

    Full Text Available Redline Torpedo Barbs (Teleostei: Cyprinidae, comprising of two species, Puntius denisonii and P. chalakkudiensis, and six evolutionarily distinct lineages are endemic to the streams of the Western Ghats freshwater ecoregion in peninsular India. Based on molecular and osteological evidence, we demonstrate that these barbs comprise a distinct genus, for which we propose the name Sahyadria.

  9. A new genus and species of Bythitidae (Teleostei: Ophidiiformes) from northwestern Australia

    DEFF Research Database (Denmark)

    Nielsen, Jørgen; Schwarzhans, Werner

    2011-01-01

    A new genus and species of bathyal bythitid fish (Teleostei: Ophidiiformes) is described based on a single specimen caught at a depth of 392 m in the Timor Sea off the coast of northwestern Australia. Timorichthys disjunctus gen. nov., sp. nov. differs from all other bythitid genera by the position...

  10. A new species of the Genus Microbrotula (Teleostei: Bythitidae) from Cenderawasih Bay, New Guinea, Indonesia

    DEFF Research Database (Denmark)

    Schwarzhans, Werner; Nielsen, Jørgen

    2012-01-01

    Following the recent revision of Microbrotula (Schwarzhans Nielsen, 2011), an additional nine specimens of the viviparous genus Microbrotula (Teleostei: Bythitidae), all caught in the Cenderawasih Bay, Irian Jaya, New Guinea, Indonesia, were made available to us. These specimens represent a new...

  11. A new species of Gobius (Perciformes: Gobiidae) from the Mediterranean Sea and the redescription of Gobius bucchichi.

    Science.gov (United States)

    Kovačić, M; Šanda, R

    2016-03-01

    A new species of the gobiid genus Gobius (Gobiidae, Perciformes), Gobius incognitus sp. nov. is described from the Mediterranean Sea, and its most morphologically similar species Gobius bucchichi is redescribed. The new species is distinguished from its congeners by: scales in lateral series 51-59; predorsal scales 25-35; opercle scaled in adults with 10-16 scales present; pectoral fin with ray count 18-20 and free tips on upper rays well developed and on the first ray longer than two thirds of the entire ray length; pelvic disc complete and with well-developed anterior membrane without lateral lobes; anterior oculoscapular canal with pore α at rear of orbit; oculoscapular row x(1) not extending forwards to pore β; suborbital row d discontinuous with large gap below suborbital rows 3 and 4; eye diameter 1·08-1·32 in snout length; by pigment rows on cheek and pigmentation on pectoral-fin base. © 2016 The Fisheries Society of the British Isles.

  12. A new species of Anchistrotos Brian, 1906 (Copepoda: Cyclopoida: Taeniacanthidae) from the filamentous shrimpgoby Myersina filifer (Valenciennes) (Perciformes: Gobiidae) in Korean waters.

    Science.gov (United States)

    Moon, Seong Yong; Lee, Jeong-Hoon; Kim, Doo Nam

    2015-10-01

    A new species of Anchistrotos Brian, 1906 (Copepoda: Cyclopoida: Taeniacanthidae), parasitic in the branchial cavities of the filamentous shrimpgoby Myersina filifer (Valenciennes) (Perciformes: Gobiidae) from Korea is described. The new species is most closely related to A. tangi Venmathi Maran, Moon & Adday, 2014, but differs from it by the following combination of characters in the adult female: the U-shaped rostrum, the distal margin of the anal somite lacks patches of spinules, the proximal segment of the maxilliped is without seta, and the maxilliped claw is armed with long and small naked setae. This is the tenth species of the genus and a key is provided to distinguish all nominal species.

  13. A digenean parasite in a mudskipper: Opegaster ouemoensis sp. n. (Digenea: Opecoelidae) in Periophthalmus argentilineatus Valenciennes (Perciformes: Gobiidae) in the mangroves of New Caledonia.

    Science.gov (United States)

    Bray, Rodney A; Justine, Jean-Lou

    2013-02-01

    Opegaster ouemoensis sp. n. is described from Periophthalmus argentilineatus Valenciennes (Gobiidae). Distinctive features included the weak or undetectable papillae of the ventral sucker and the small, but distinct cirrus-sac. The new species is compared with 25 marine species of Opegaster for which a table of measurements and ratios is presented. The new combination Opegaster queenslandicus (Aken'Ova, 2007) (originally in Opecoelus) is formed. Fifteen mudskippers were intensively examined for parasites; larval anisakid nematodes and acanthocephalans were found, but no monogeneans, cestodes, copepods, isopods, hirudineans or adult nematodes. A brief summary of the helminth parasites of mudskippers is included.

  14. Molecular phylogeny and biogeography of percocypris (Cyprinidae, Teleostei.

    Directory of Open Access Journals (Sweden)

    Mo Wang

    Full Text Available Fierce predatory freshwater fishes, the species of Percocypris (Cyprinidae, Teleostei inhabit large rivers or lakes, and have a specific distribution pattern. Only a single species or subspecies occurs in each large-scale drainage basin of the Southeastern Tibetan Plateau. In this study, the molecular phylogenetic relationships for all but one of the described subspecies/species of Percocypris were investigated based on three mitochondrial genes (16S; COI; Cyt b and one nuclear marker (Rag2. The results of Maximum Likelihood and Bayesian Inference analyses show that Percocypris is a strongly supported monophyletic group and that it is the sister group of Schizothorax. Combined with analyses of morphological characters, our results suggest that Percocypris needs to be reclassified, and we propose that six species be recognized, with corresponding distributions in five main drainages (including one lake. In addition, based on the results of the estimation of divergence times and ancestral drainages, we hypothesize that Percocypris likely originated in the early Miocene from a paleo-connected drainage system containing the contemporary main drainages of the Southeastern Tibetan Plateau. This study suggests that vicariance (due to the uplift of the Tibetan Plateau modifying the large-scale morphologies of drainage basins in the Southeastern Tibetan Plateau has played an important role in the speciation of the genus. Furthermore, external morphological characters (such as the length of the fins and an internal trait (the position of pterygiophore appear to be correlated with different habitats in rivers and the lake.

  15. The epidemiology of tuberculosis in free-ranging African buffalo (Syncerus caffer) in the Kruger National Park, South Africa.

    Science.gov (United States)

    De Vos, V; Bengis, R G; Kriek, N P; Michel, A; Keet, D F; Raath, J P; Huchzermeyer, H F

    2001-06-01

    The presence of bovine tuberculosis (Mycobacterium bovis) in the Kruger National Park (KNP) was determined for the first time in 1990. It was diagnosed in an African buffalo (Syncerus caffer) bull, which was found recumbent and in an emaciated and moribund state near the south-western boundary fence. This prompted an investigation into the bovine tuberculosis (BTB) status of the KNP, with emphasis on its epidemiological determinants and risk factors. This report documents the findings of surveys that were conducted from 1990 to 1996. It was found that BTB had entered the KNP ecosystem relatively recently (+/- 1960), and has found favourable circumstances for survival and propagation in a fully susceptible and immunologically naive buffalo population. Indications are that it entered the KNP from across the southern river boundary, where the presence of infected domestic cattle herds had been documented. From there the infection spread through the southern buffalo population and is currently spreading in a northward direction. It was estimated that this northward spread took place at a rate of about 6 km per year; the prospect being that, if this rate of spread is maintained, the entire KNP may be affected in less than 30 years from now. Spillover from buffalo had already occurred in species such as chacma baboon (Papio ursinus), lion (Panthera leo), cheetah (Acinonyx jubatus), kudu (Tragelaphus strepsiceros) and leopard (Panthera pardus). Although there is no indication yet that these species act as maintenance hosts, the possibility is raised that these, or an as yet overlooked species, might assume such a role in future. In the KNP, BTB manifests itself as a chronic and predominantly subclinical disease in buffalo. It may take years for clinical signs to develop, and then only at a terminal stage, when emaciation is a constant feature. It is suspected that the time from infection to death is variable and dependent on the animal's immune response, which can be

  16. Revision of the genus 'Microbrotula' (Teleostei: Bythitidae), with description of two new species and a related new genus

    DEFF Research Database (Denmark)

    Schwarzhans, Werner; Nielsen, Jørgen

    2011-01-01

    Following recent systematic revisions of Anderson (2005, 2007), seven species of the viviparous genus Microbrotula (Teleostei: Bythitidae) have been described, all from the Indo-west Pacific Ocean. Six of these species are here recognised as valid: M. bentleyi, M. greenfieldi, M. punicea, M. quee...

  17. The use of thiafentanil oxalate and azaperone for reversible immobilisation of African buffalo (Syncerus caffer) within a nature reserve - Short communication.

    Science.gov (United States)

    Szabó, Zoltán; Venter, Diederik Jacobus; Luyt, Eustatius Du Chavoux; Raath, Cobus

    2015-03-01

    Although thiafentanil oxalate has been widely used for wildlife immobilisation on different species, no report has been published about its usefulness on African buffalo (Syncerus caffer). Thirty-four African buffaloes were successfully immobilised at Loskop Dam Nature Reserve, South Africa in July 2013. The animals were kept in bomas of the nature reserve. The purpose of the immobilisation was to provide opportunity for microchip implantation, ear tag placement, intradermal tuberculin test and blood sampling. All animals were immobilised with thiafentanil oxalate 6 mg/animal (0.007-0.01 mg/kg) and azaperone 40 mg/animal (0.07-0.04 mg/kg) using Dan-inject darts and gun. The opioid reversal agent naltrexone hydrochloride 60 mg/animal (0.07-0.1 mg/kg) was given intravenously to the ear vein. The mean induction time was 3.9 ± 0.2 min, the recovery time was 1.65 ± 0.87 min. The results of the present study indicate that thiafentanil oxalate, this low-volume, high-potency, reversible drug combined with azaperone provides fast induction and smooth recovery. The authors recommend this drug combination as a reliable immobilising regimen for African buffalo.

  18. Comparative Intradermal Tuberculin Testing of Free-Ranging African Buffaloes (Syncerus caffer Captured for Ex Situ Conservation in the Kafue Basin Ecosystem in Zambia

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    Hetron Mweemba Munang'andu

    2011-01-01

    Full Text Available Bovine tuberculosis (BTB is endemic in African buffaloes (Syncerus caffer in some National Parks in Southern Africa, whilst no studies have been conducted on BTB on buffalo populations in Zambia. The increased demand for ecotourism and conservation of the African buffalo on private owned game ranches has prompted the Zambian Wildlife Authority (ZAWA and private sector in Zambia to generate a herd of “BTB-free buffaloes” for ex situ conservation. In the present study, 86 African buffaloes from four different herds comprising a total of 530 animals were investigated for the presence of BTB for the purpose of generating “BTB free” buffalo for ex-situ conservation. Using the comparative intradermal tuberculin test (CIDT the BTB status at both individual animal and herd level was estimated to be 0.0% by the CIDT technique. Compared to Avian reactors only, a prevalence of 5.8% was determined whilst for Bovine-only reactors a prevalence of 0.0% was determined. These results suggest the likelihood of buffalo herds in the Kafue National Park being free of BTB.

  19. Habitat selection by African buffalo (Syncerus caffer in response to landscape-level fluctuations in water availability on two temporal scales.

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    Emily Bennitt

    Full Text Available Seasonal fluctuations in water availability cause predictable changes in the profitability of habitats in tropical ecosystems, and animals evolve adaptive behavioural and spatial responses to these fluctuations. However, stochastic changes in the distribution and abundance of surface water between years can alter resource availability at a landscape scale, causing shifts in animal behaviour. In the Okavango Delta, Botswana, a flood-pulsed ecosystem, the volume of water entering the system doubled between 2008 and 2009, creating a sudden change in the landscape. We used African buffalo (Syncerus caffer to test the hypotheses that seasonal habitat selection would be related to water availability, that increased floodwater levels would decrease forage abundance and affect habitat selection, and that this would decrease buffalo resting time, reduce reproductive success and decrease body condition. Buffalo selected contrasting seasonal habitats, using habitats far from permanent water during the rainy season and seasonally-flooded habitats close to permanent water during the early and late flood seasons. The 2009 water increase reduced forage availability in seasonally-flooded habitats, removing a resource buffer used by the buffalo during the late flood season, when resources were most limited. In response, buffalo used drier habitats in 2009, although there was no significant change in the time spent moving or resting, or daily distance moved. While their reproductive success decreased in 2009, body condition increased. A protracted period of high water levels could prove detrimental to herbivores, especially to smaller-bodied species that require high quality forage. Stochastic annual fluctuations in water levels, predicted to increase as a result of anthropogenically-induced climate change, are likely to have substantial impacts on the functioning of water-driven tropical ecosystems, affecting environmental conditions within protected areas

  20. Sarcoptes mite epidemiology and treatment in African buffalo (Syncerus caffer calves captured for translocation from the Kafue game management area to game ranches

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    Munyeme Musso

    2010-06-01

    Full Text Available Abstract Background In Zambia, translocation of wildlife from National Parks to private owned game ranches demands that only animals free of infectious diseases that could adversely affect the expansion of the wildlife industry should be translocated to game ranches. Sarcoptes mange (Sarcoptes scarbiei has been involved in the reduction of wildlife populations in some species. Results Sarcoptes mange (Sarcoptes scarbiei was detected and eradicated from two herds of African buffalo (Syncerus caffer calves captured in the Kafue GMA in July 2004 and August 2005. The overall prevalence was estimated at 89.5% (77/86. Sex had no influence on the occurrence and severity of the disease. Of the 86 calves used in the study, 72.1% had good body condition scores, 20.9% were fair and 7.0% were poor. Of the 77 infected calves, 53.2% were mildly infected, 28.6% were moderately and 18.2% were severely infected. Body condition score was correlated to the severity of the infection (r = 0.72, p n = 86 at capture. Eradication of Sarcoptes mites from the entire herd using ivermetcin was dependant on the severity of the infection. The overall ability of ivermectin to clear the infection after the first treatment was estimated at 81.8% (n = 77. It increased to 94.8% and 100% after the second and third treatments respectively. Conclusion This is the first report on the epidemiology and treatment of Sarcoptes mange in African buffaloes in Zambia. This study improves our understanding about Sarcoptes scabiei epidemiology and treatment which will have further applications for the safe animal translocation.

  1. Description of Events Where African Buffaloes (Syncerus caffer) Strayed from the Endemic Foot-and-Mouth Disease Zone in South Africa, 1998-2008.

    Science.gov (United States)

    van Schalkwyk, O L; Knobel, D L; De Clercq, E M; De Pus, C; Hendrickx, G; Van den Bossche, P

    2016-06-01

    African buffaloes (Syncerus caffer) are reservoir hosts of Southern African Territories (SAT) foot-and-mouth disease (FMD) virus strains. In South Africa, infected buffaloes are found in the FMD-infected zone comprising the Kruger National Park (KNP) and its adjoining reserves. When these buffaloes stray into livestock areas, they pose a risk of FMD transmission to livestock. We assessed 645 records of stray buffalo events (3124 animals) from the FMD infected zone during 1998-2008 for (i) their temporal distribution, (ii) group size, (iii) age and gender composition, (iv) distance from the infected zone fence and (v) outcome reported for each event. A maximum entropy model was developed to evaluate spatial predictors of stray buffalo events and assess current disease control zones. Out of all buffaloes recorded straying, 38.5% escaped from the FMD infected zone during 2000/2001, following floods that caused extensive damage to wildlife fences. Escape patterns were not apparently influenced by season. The median size of stray groups was a single animal (IQR [1-2]). Adult animals predominated, comprising 90.4% (620/686) of the animals for which age was recorded. Of the 315 events with accurate spatial information, 204 (64.8%) were recorded within 1 km from the FMD infected zone. During late winter/spring (June-October), stray buffaloes were found significantly closer to the FMD infected zone (median = 0.3 km, IQR [0.1-0.6]). Less than 13% (40/315) of stray groups reached the FMD protection zone without vaccination, posing a higher risk of spreading FMD to these more susceptible livestock. Model outputs suggest that distance from the FMD infected zone, urban areas and permanent water sources contributed almost 85% to the spatial probability of stray buffalo events. Areas with a high probability for stray buffalo events were well covered by current disease control zones, although FMD risk mitigation could be improved by expanding the vaccination zone in certain areas

  2. Distribution of Trematodes Cryptokotyle (Trematoda, Heterophyidae, in Fish of the Family Gobiidae in the Estuary Waters and the Black Sea in Southern Ukraine

    Directory of Open Access Journals (Sweden)

    Goncharov S. L.

    2017-10-01

    Full Text Available The article describes occurrence and distribution of Cryptocotyle trematodes in fish in the waters of the Dnipro-Buh estuary and the Black Sea in Mykolaiv and Odesa Region. Study was conducted in 2015-2016. Two trematode species were found in natural waters of these regions: Cryptocotyle cancavum Crepli, 1825 and Cryptocotyle jejuna Nicoll, 1907. Th e latter species has not been previously registered in this region in southern Ukraine. Varying intensity of infection with Cryptocotyle metacercariae was observed in fish of Gobiidae family: Mesogobius batrachocephalus Pallas, 1814, Neogobius melanostomum Pallas, 1814, N. fluviatialis Pallas, 1814. Th e most affected species was N. melanostomum, with the prevalence of infection 59.2 %. Less infected were N. fluviatialis and M. batrachocephalus, with the prevalence of infection 30.4 % and 17 % respectively. The intensity of infection was the highest in N. melanostomum - 211 metacercariae per fish, followed by N. fluviatialis and M. batrachocephalu - 124 and 89 metacercariae respectively. Cryptocotyle was the most prevalent in the Dnipro-Buh estuary (cape Adzhigol, Mykolaiv Region and much less prevalent in the waters of the Black Sea in Mykolaiv and Odesa Regions. Mean prevalence of infection was 31.4 %.

  3. OLDEST STEM TELEOSTEI FROM THE LATE LADINIAN (MIDDLE TRIASSIC OF SOUTHERN CHINA

    Directory of Open Access Journals (Sweden)

    ANDREA TINTORI

    2015-11-01

    Full Text Available The origin of the largest modern vertebrate group, the Teleostei, saw major refinements in the last decades, thanks to newly discovered and stratigraphically closely spaced Triassic Lagerstätten. Here we report the oldest Pholidophoriformes (stem teleosts that were collected during a large scale yet detailed excavation of Upper Ladinian (Middle Triassic marine deposits in Xingyi City, Guizhou Province, China. Taxonomic comparisons support the erection of a new pholidophorid genus, Malingichthys gen. nov., with two species. The new genus shows a partially fused skull roof, a preopercular bone with a hockey-stick shape and, for the first time in Pholidophoridae, supraneural elements. Most Triassic marine vertebrate clades (fishes and reptiles, Malingichthys included first emerged in the South China Block, with Late Ladinian most showing an important faunal transformation that was strengthened by our last findings. The material here described is about 2 million years older than the previous records for pholidophorids. 

  4. Identification of Theileria parva and Theileria sp. (buffalo) 18S rRNA gene sequence variants in the African Buffalo (Syncerus caffer) in southern Africa.

    Science.gov (United States)

    Chaisi, Mamohale E; Sibeko, Kgomotso P; Collins, Nicola E; Potgieter, Fred T; Oosthuizen, Marinda C

    2011-12-15

    Theileria parva is the causative agent of Corridor disease in cattle in South Africa. The African buffalo (Syncerus caffer) is the reservoir host, and, as these animals are important for eco-tourism in South Africa, it is compulsory to test and certify them disease free prior to translocation. A T. parva-specific real-time polymerase chain reaction (PCR) test based on the small subunit ribosomal RNA (18S rRNA) gene is one of the tests used for the diagnosis of the parasite in buffalo and cattle in South Africa. However, because of the high similarity between the 18S rRNA gene sequences of T. parva and Theileria sp. (buffalo), the latter is also amplified by the real-time PCR primers, although it is not detected by the T. parva-specific hybridization probes. Preliminary sequencing studies have revealed a small number of sequence differences within the 18S rRNA gene in both species but the extent of this sequence variation is unknown. The aim of the current study was to sequence the 18S rRNA genes of T. parva and Theileria sp. (buffalo), and to determine whether all identified genotypes can be correctly detected by the real-time PCR assay. The reverse line blot (RLB) hybridization assay was used to identify T. parva and Theileria sp. (buffalo) positive samples from buffalo blood samples originating from the Kruger National Park, Hluhluwe-iMfolozi Park, the Greater Limpopo Transfrontier Park, and a private game ranch in the Hoedspruit area. T. parva and Theileria sp. (buffalo) were identified in 42% and 28%, respectively, of 252 samples, mainly as mixed infections. The full-length 18S rRNA gene of selected samples was amplified, cloned and sequenced. From a total of 20 sequences obtained, 10 grouped with previously published T. parva sequences from GenBank while 10 sequences grouped with a previously published Theileria sp. (buffalo) sequence. All these formed a monophyletic group with known pathogenic Theileria species. Our phylogenetic analyses confirm the

  5. Atlas of marine bony fish otoliths (sagittae of Southeastern-Southern Brazil Part V: Perciformes (Sparidae, Sciaenidae, Polynemidae, Mullidae, Kyphosidae, Chaetodontidae, Mugilidae, Scaridae, Percophidae, Pinguipedidae, Blenniidae, Gobiidae, Ephippidae, Sphyraenidae, Gempylidae, Trichiuridae, Scombridae, Ariommatidae, Stromateidae and Caproidae

    Directory of Open Access Journals (Sweden)

    Cesar Santificetur

    Full Text Available ABSTRACT This publication is part of a series prepared with the purpose to constitute an Atlas of Teleostei Otoliths for the Southeastern-Southern Brazilian area. Here we present the results of 15 morphological features and six shape indices for 33 Perciformes species of 20 families. Whenever available in out collection, three otoliths of each species were illustrated and photographed. The frequency of occurrence of each feature was calculated inside and among total length classes being the differences analyzed through multiple χ2 tests (significance level 0.05. Based on otoliths measurements, six shape indices values were obtained being the minimum, maximum, mean and standard deviations values presented.

  6. Support for a 'Center of Origin' in the Coral Triangle: cryptic diversity, recent speciation, and local endemism in a diverse lineage of reef fishes (Gobiidae: Eviota).

    Science.gov (United States)

    Tornabene, Luke; Valdez, Samantha; Erdmann, Mark; Pezold, Frank

    2015-01-01

    The Coral Triangle is widely regarded as the richest marine biodiversity hot-spot in the world. One factor that has been proposed to explain elevated species-richness within the Coral Triangle is a high rate of in situ speciation within the region itself. Dwarfgobies (Gobiidae: Eviota) are a diverse genus of diminutive cryptobenthic reef fishes with limited dispersal ability, and life histories and ecologies that increase potential for speciation. We use molecular phylogenetic and biogeographic data from two clades of Eviota species to examine patterns, processes and timing associated with species origination within the Coral Triangle. Sequence data from mitochondrial and nuclear DNA were used to generate molecular phylogenies and median-joining haplotype networks for the genus Eviota, with emphasis on the E. nigriventris and E. bifasciata complexes - two species groups with distributions centered in the Coral Triangle. The E. nigriventris and E. bifasciata complexes both contain multiple genetically distinct, geographically restricted color morphs indicative of recently-diverged species originating within the Coral Triangle. Relaxed molecular-clock dating estimates indicate that most speciation events occurred within the Pleistocene, and the geographic pattern of genetic breaks between species corresponds well with similar breaks in other marine fishes and sessile invertebrates. Regional isolation due to sea-level fluctuations may explain some speciation events in these species groups, yet other species formed with no evidence of physical isolation. The timing of diversification events and present day distributions of Eviota species within the Coral Triangle suggest that both allopatric speciation (driven by ephemeral and/or 'soft' physical barriers to gene flow) and sympatric speciation (driven by niche partitioning and assortative mating) may be driving diversification at local scales within the Coral Triangle. The presence of multiple young, highly

  7. Hyphessobrycon ocasoensis sp. n. (Teleostei, Characidae una nueva especie para el Alto Cauca, Colombia

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    García-Alzate, C. A.

    2008-12-01

    Full Text Available Hyphessobrycon ocasoensis n. sp. (Teleostei, Characidae a new species from the Alto Cauca, Colombia Hyphessobrycon ocasoensis n. sp. (Characiformes, Characidae from heterorhabdus group (Gery, 1977 is described from the upper Cauca River in Colombia. The new species is distinguished from all other known species by the following combination of characters: three unbranched and eight branched fins in the dorsal fin; short maxillary bone with one or no teeth; four small foramens in the maxillary bone, and five in the premaxillary; 5-17 scales with pores in the lateral line, six between the lateral line and anal-fin origin, six between the lateral line and pelvic-fin origin, and nine predorsals; depth of the caudal peduncle has a mean of 16.7% in standard length; interorbital width 50.6% in head; a dark spot on caudal peduncle and a dark lateral band that extends vertically from the dorsal–fin origin to the tips of the middle caudal fin rays. Physical and chemical data of their habitat are included.

  8. A new allocreadiid (Trematoda) species from freshwater fish Heterandria bimaculata (Teleostei: Poeciliidae) in Southeastern Mexico.

    Science.gov (United States)

    Salgado-Maldonado, Guillermo; Caspeta-Mandujano, Juan Manuel; Vázquez, Gabriela

    2012-04-01

    Paracreptotrema heterandriae n. sp. (Trematoda: Allocreadiidae) is described from the intestine of the freshwater fish Heterandria bimaculata (Teleostei: Poeciliidae) from the upper basin of Río La Antigua, in Veracruz, Mexico. The new species is distinguished from the 3 others in the Paracreptotrema Choudhury, Pérez-Ponce de León, Brooks, and Daverdin, 2006 , mainly by having a feeble membranous cirrus sac containing an uncoiled seminal vesicle, instead of a well-developed muscular cirrus sac that encloses coiled seminal vesicle, pars prostatica, and ejaculatory duct as in the previously 3 nominal species. Moreover, eggs of the new species are larger than all others ([measurements in micrometers] eggs of P. heterandriae n. sp. 72.5 [70-75] × 40 [35-41]; P. blancoi 55.4 [52.5-62.5] × 38.5 [32.5-42.5]; P. mendezi 46 × 37; P. profundulusi 57 [52-60] × 27.8 [25-30]).

  9. Clave ilustrada de los peces chilenos de la familia Serranidae (Teleostei: Perciformes

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    Germán Pequeño

    2011-03-01

    Full Text Available Se presenta una clave para reconocer especies de la familia Serranidae de Chile, que se agrupan en las subfamilias Epinephelinae, Serraninae y Anthiinae. Se proporcionan antecedentes básicos referidos a la taxonomía del grupo, para mayor facilidad del reconocimiento. En cada caso específico, se indica la distribución geográfica e ilustraciones reducidas de las 13 especies de la familia Serranidae que en la actualidad son consideradas en la ictiofauna de Chile.Illustrated key for the Chilean fishes of the family Serranidae (Teleostei: Perciformes. A taxonomic key for identification of fish species of the family Serranidae of Chile, grouped in the subfamilies Epinephelinae, Serraninae and Anthiinae is presented. Basic data about the taxonomic of the group to facilitate the identification is given. In each specific case, the geographical distribution is showed. Reduced illustrations for the currently 13 serranid species considered in the Chilean ichthyofauna are included. Rev. Biol. Trop. 59 (1: 247-253. Epub 2011 March 01.

  10. Phylogenetic Relationships of Pseudorasbora, Pseudopungtungia, and Pungtungia (Teleostei; Cypriniformes; Gobioninae Inferred from Multiple Nuclear Gene Sequences

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    Keun-Yong Kim

    2013-01-01

    Full Text Available Gobionine species belonging to the genera Pseudorasbora, Pseudopungtungia, and Pungtungia (Teleostei; Cypriniformes; Cyprinidae have been heavily studied because of problems on taxonomy, threats of extinction, invasion, and human health. Nucleotide sequences of three nuclear genes, that is, recombination activating protein gene 1 (rag1, recombination activating gene 2 (rag2, and early growth response 1 gene (egr1, from Pseudorasbora, Pseudopungtungia, and Pungtungia species residing in China, Japan, and Korea, were analyzed to elucidate their intergeneric and interspecific phylogenetic relationships. In the phylogenetic tree inferred from their multiple gene sequences, Pseudorasbora, Pseudopungtungia and Pungtungia species ramified into three phylogenetically distinct clades; the “tenuicorpa” clade composed of Pseudopungtungia tenuicorpa, the “parva” clade composed of all Pseudorasbora species/subspecies, and the “herzi” clade composed of Pseudopungtungia nigra, and Pungtungia herzi. The genus Pseudorasbora was recovered as monophyletic, while the genus Pseudopungtungia was recovered as polyphyletic. Our phylogenetic result implies the unstable taxonomic status of the genus Pseudopungtungia.

  11. Author Details

    African Journals Online (AJOL)

    Brownson, II. Vol 16, No 4 (2010) - Articles The reproductive characteristics of mudskipper Periophthalmus barbarus (linnaeus 1760) (teleostei, Gobiidae) in the estuarine swamps of the Imo river, Nigeria Abstract. ISSN: 1118-0579. AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians ...

  12. Author Details

    African Journals Online (AJOL)

    Parkinson, MC. Vol 36, No 2 (2011) - Articles Short Note Effect of turbidity on the foraging success of Glossogobius callidus (Teleostei: Gobiidae) Abstract. ISSN: 1727-9364. AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors · FAQ's · More about AJOL · AJOL's Partners · Terms ...

  13. Variación morfológica de las especies de Astyanax, subgénero Zygogaster (Teleostei, Characidae

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    Ruiz-C., R. I.

    2011-06-01

    Full Text Available Morphological variation of Astyanax species, subgenus Zygogaster (Teleostei, Characidae The diverse Neotropical fish genus Astyanax inhabits a variety of aquatic environments. As with other species in this genus, the taxonomic status and phylogenetic relationships of species of this subgenus remain largely undetermined. Based on 354 individuals, we analyzed the morphological variation of four species of the subgenus Zygogaster (A. atratoensis, A. caucanus, A. filiferus, and A. magdalenae using procrustes analysis and compared findings with two species of the sister group: subgenus Poecilurichthys (A. orthodus and A. superbus. The PCA (Principal Component Analysis and CVA (Canonical Variates Analysis showed morphological affinity between the subgenera and indicated variance in body depth, anterior trend of dorsal fin origin and humeral spot, depression on the dorsal surface of the skull, and ventral displacement of the orbit and snout. The variation in these structures may provide evidence supporting adaptive speciation as an alternative to speciation driven by geographical isolation.

  14. Nematode larvae of hygienic importance infecting Chaetodipterus faber (Broussonet, 1782 and Trachinotus carolinus (Linnaeus, 1766 (Pisces: Teleostei in Brazil

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    Janaina Ribeiro

    2014-06-01

    Full Text Available ABSTRACT. Ribeiro J., São Clemente S.C., Lopes L.M.S. & Knoff M. Nematode larvae of hygienic importance infecting Chaetodipterus faber (Broussonet, 1782 and Trachinotus carolinus (Linnaeus, 1766 (Pisces: Teleostei in Brazil. [Larvas de nematóides de importância higiênica-sanitária em Chaetodipterus faber (Broussonet, 1782 e Trachinotus carolinus (Linnaeus, 1766 (Pisces: Teleostei no Brasil.] Revista Brasileira de Medicina Veterinária, 36(2: 121-124, 2014. Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz, Fiocruz, Avenida Brasil 4365, Manguinhos, Rio de Janeiro, RJ, 21045-900, Brasil. E-mail: knoffm@ioc.fiocruz.br From March 2010 to Aprill 2011, thirty-five specimens of the Atlantic spadefish Chaetodipterus faber, and thirty specimens of the Florida pompano Trachinotus carolinus, were purchased from a fish market of municipality of Niterói, Rio de Janeiro State, Brazil. The fishes were measured, fileted and further had their organs investigated for helminths. In the both species were parasitized by Hysterothylacium sp. third-stage larvae nematodes with prevalence of 17.1% and 40%, mean intensity of 2 and 9.6, range of infection of 1-2 and 1-28 and mean abundance of 0.23 and 3.83,respectively. The sites of infection to C. faber were piloric cecum, liver, and abdominal cavity, and to T. carolinus, piloric cecum, liver, seroses of liver and ovarian, and abdominal cavity. Hysterothylacium sp. larvae were reported in C. faber for the first time, and is the first report in T. carolinus by these nematodes for Brazil, presenting considerations on the sanitary aspects due to the importance in the fish hygiene and public health programs.

  15. TELEOSTEI; MUGILIDAE

    African Journals Online (AJOL)

    The macro-morphology and the histology of the testis of Liza dumerili are described with special reference to the various types of spermatogenic cells. L. dumerili possesses typical teleost testes. The only peculiarity is the conspicuous main sperm duct, which runs on the surface (medio-ventral) along the entire length of ...

  16. TELEOSTEI: SPARIDAE

    African Journals Online (AJOL)

    were recorded to the nearest O,5°C at each station, being the average of three readings (morning, noon, and night). R ep ..... occur in estuaries. This leech is known to be parasitic on amphibians, although it may use fresh- ...... Conversely, Romer (1966) maintains that the fossil records of the late Silurian and early. Devonian ...

  17. TELEOSTEI: SPARIDAE

    African Journals Online (AJOL)

    the actual dominant macroscopic sex, based on the presence or absence of Barr bodies in a sample of steenbras liver sections proved very accurate. This is the first record of sex-chromatin occurring in teleost tissue. There was no indication of sex-reversal, the steenbras remaining permanently hermaphroditic throughout ...

  18. Two new species of Monogenea (Platyhelminthes: Cercomeridea parasitic on Chaetodipterus faber (Teleostei: Ephippidae from the Brazilian coastal zone

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    A. D. Cezar

    1999-09-01

    Full Text Available Metazoan parasites were extracted for 110 Chaetodipterus faber (Broussonet, 1782 (Teleostei: Ephippidae specimens from the coastal zone of the State of Rio de Janeiro, Brazil (nearly 21-23° S, 41-45° W. Two new species of monogeneans belonging to genera Sprostoniella and Parancylodiscoides are described and illustrated. The new species of Sprostoniella, differ from S. multitestis, the only known species of the genus, by: 1. the arrangement of septa (with 17 septa, two of them bifid and two incomplet in the new species; 17 septa, two of them trifid in S. multitestis. 2. the new species showed two central loculi, while S. multitestis only one, and 3. the first pair of anchors of the new species is small and poorly developed, while in S. multitestis is well developed and strong. The new species of Parancylodiscoides differs from P. chaetodipteri, the only known species of the genus, by: 1. the testis shape (bilobated in the new species, not bilobated in P. chaetodipteri, and 2. by the presence of accessory prostatic reservoir at the copulatory organ base (absent in P. chaetodipteri.Se extrajeron metazoos parásitos de 110 Chaetodipterus faber (Broussonet, 1782 (Teleostei: Ephippidae del litoral del Estado de Rio de Janeiro, Brasil (aprox. 21-23° S, 41-45° W. Se describe e ilustra dos nuevas especies de monogéneos de los géneros Sprostoniella y Parancylodiscoides. La nueva especie de Sprostoniella difiere de S. multitestis, la otra especie del género, por 1. la disposición de los septos (con 17 septos, dos de ellos bífidos y dos incompletos en la nueva especie; 17 septos, dos de ellos trífidos en S. multitestis, 2. la nueva especie muestra dos lóculos centrales, mientras S. multitestis sólo uno, y 3. el primer par de ganchos en la nueva especie es pequeño y poco desarrollado, mientras que en S. multitestis es robusto y bien desarrollado. La nueva especie de Parancylodiscoides difiere de P. chaetodipteri, la otra especie del género, por

  19. Gonadal maturation and histological observations of the grey triggerfish Balistes capriscus Gmelin, 1789 (Teleostei: Balistidae in the Gulf of Gabès, Tunisia

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    Hichem Kacem

    2015-05-01

    Full Text Available Objective: To determine the spawning activity using gonadosomatic index (GSI and gonad histology the Balistes capriscus (Teleostei: Balistidae of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea. Methods: The reproductive biology of the species, based on 756 (480 females and 276 males, collected from commercial catches at several fishing ports including Chebba, Kerkennah and Zarzis at respective GPS coordinates (34°14' N, 11°06' E, (34°45' N, 11°17' E, (33°41' N, 11°48' E was studied over 28 months (January 2008-April 2010 using GSI and gonad histology. Sizes used in this study ranged from 11.30 to 45.60 cm in fork length. Results: Both GSI and gonad histology suggest that spawning activity occurred mainly between July and mid-September with a peak in July, coinciding with summer time. The first maturation occurred at 20.26 cm fork length for females and 21.30 cm fork length for males. The monthly values of hepatosomatic index and condition factor (K indicated that the liver is the main organ responsible for the mobilization process of the energizing reserves during the sexual cycle. Conclusions: It is the first inventory of gonadal maturation and histological observations of the grey triggerfish Balistes capriscus Gmelin, 1789 (Teleostei: Balistidae in the Gulf of Gabès, (Southern Tunisia, Central Mediterranean Sea.

  20. Molecular taxonomy and identification within the Antarctic genus Trematomus (Notothenioidei, Teleostei): How valuable is barcoding with COI?

    Science.gov (United States)

    Lautredou, A.-C.; Bonillo, C.; Denys, G.; Cruaud, C.; Ozouf-Costaz, C.; Lecointre, G.; Dettai, A.

    2010-08-01

    The Trematominae are a particularly interesting subfamily within the antarctic suborder Notothenioidei (Teleostei). The 14 closely related species occupy a large range of ecological of niches, extremely useful for evolutionary and biogeography studies in the Antarctic Ocean. But some Trematomus species can be difficult to identify by using morphological criteria, specially young stages and damaged specimens. Molecular identification would therefore be highly useful, however the suitability of the cytochrome oxidase I gene in a barcoding approach needs to be assessed. We evaluated species delineation within the genus Trematomus comparing morphological identification, nuclear markers (the rhodopsin retrogene and a new nuclear marker pkd1: polycystic kidney disease 1) and COI. We show that Trematomus vicarius is not distinguishable from Trematomus bernacchii with the molecular markers used, and neither is Trematomus loennbergii from Trematomus lepidorhinus. We suggest that until this is investigated further, studies including these species list them as T. loennbergii/ T. lepidorhinus group, and keep voucher samples and specimens. Generally, COI gives a congruent result with the rhodopsin retrogene, and except for the previously cited species pairs, COI barcoding is efficient for identification in this group. Moreover pkd1 might not be suitable for a phylogenetic study at this scale for this group.

  1. Comparative morphology and cytology of the male sperm-transmission organs in viviparous species of clinid fishes (Clinidae: Teleostei, Perciformes).

    Science.gov (United States)

    Fishelson, Lev; Gon, Ofer; Holdengreber, Vered; Delarea, Yakob

    2006-12-01

    This work comprises the first comparative study of the morphology and cytology of the sperm transmission organs in males of 14 species of viviparous clinid fishes (Clinidae, Blennioidei, Teleostei). The form and dimensions of these organs differ among the various species studied. The organs are composed of intra-abdominal ampullae, into which the sperm ducts and urinary bladder anchor, and an external protruding intromittent papilla used for insemination. The form of the ampullae differs among the various species, from pear-shaped to horseshoe-shaped. It increases in dimensions with increasing length of the male. In all the species this organ is covered by a connective-tissue tunic that encompasses both circular and longitudinal striated muscle bundles. The lumina of the ampullae harbor the epididymis, a strongly convoluted and plicated duct, which becomes filled with spermatozeugmata during reproduction. From here, the epididymis continues into the protruding intromittent papillae, where its folds gradually straighten at the apical part of the intromittent organ. The form and dimensions of this copulatory organ also differ in the various species. Papillae bearing taste buds are found on the apical parts of the intromittent organ, and it is probable that these, together with the difference in forms of the organ, help to prevent interspecific copulation. Copyright 2006 Wiley-Liss, Inc.

  2. Mortality of Juvenile So-iuy Mullet, Liza Haematocheilus (Teleostei, Mugilidae, in the Sea of Azov Associated With Metacercaria (Digenea

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    Sarabeev V.

    2015-12-01

    Full Text Available Mortality of Juvenile So-iuy Mullet, Liza haematocheilus (Teleostei, Mugilidae, in the Sea of Azov Associated with Metacercariae (Digenea. Sarabeev, V. - Age-dependent patterns, including yearly variations of digenean metacercariae infestations of the introduced species, Liza haematocheilus (Temminck & Schlegel, 1845, were studied. We evaluated the impacts of three metacercaria species, Timoniella imbutiforme (Molin, 1859 Brooks, 1980, Diplostomum spp. and Ascocotyle (Phagicola longa Ransom, 1920, on juvenile fish in age from one month to 2+ years old from the Molochny Estuary and neighboring waters of the Sea of Azov by applying Croft on’s negative binomial truncation technique, epidemiologic and aggregation indices. Parasite surveys executed in 1997-2014 revealed significant yearly differences in the infection dynamics of studied metacercariae in juvenile fish of L. haematocheilus. Metacercariae were absent or fish harboured several times less parasites in 2005-2013 than in 1997-1999. T. imbutiforme infection exhibits a convex that was observed in a decline of the parasite load aft er an initial increase. The infection load of Diplostomum spp. increased asymptotically with the fish age reaching maximum value in two years old juveniles. Both the abundance and the prevalence of A. (P. longa were low in juveniles of two month and two years old but relatively high and more or less constant during the rest of the juvenile period. Results of the present study suggest that metacercariae, especially, T. imbutiforme, are associated with mortality of juvenile Liza haematocheilus.

  3. Catálogo dos Peixes Marinhos do Laboratório de Ictiologia da Universidade Federal do Rio de Janeiro. Parte I: Chondrichthyes (Rajiformes). Teleostei (Elopiformes a Dactylopteriformes)

    OpenAIRE

    Paulo Roberto Duarte Lopes

    1989-01-01

    The present paper is the first part of the catalogue of marine fishes belonging to the collection of the Laboratory of Ichthyology (Universidade Federal do Rio de Janeiro-RJ) to be published. Here are included Chondrichthyes (Rajiformes) and part of Osteichthyes, Teleostei (Elopiformes to Dactylopteriformes) in a total amount of 30 families, 52 genera and 62 species. The most part of the material have been collected at the littoral of the State of Rio de Janeiro. For each species considered i...

  4. (Syncerus caffer) in the Kruger National Park

    African Journals Online (AJOL)

    Unknown

    nutritional mineral levels, and may be an indication of soil mineral levels and/or the ability of the forage plants to assimilate minerals from the soil. The aim of this paper is to report on the mineral status of the African buffalo in the Kruger National Park (KNP). Materials and Methods. Liver samples were taken from 666 buffalo.

  5. Description de trois Monogènes nouveaux, parasites branchiaux de Mormyrus rume (Teleostei : Mormyridae en Côte d’Ivoire

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    Blahoua K.G.

    2009-03-01

    Full Text Available L’étude de la parasitofaune branchiale d’un Mormyridae, Mormyrus rume Valenciennes, 1846 (Teleostei : Mormyridae, capturé dans le lac de retenue d’Ayamé I en Côte d’Ivoire (Afrique de l’Ouest a révélé la présence de trois Monogènes nouveaux du genre Bouixella Euzet & Dossou, 1976, qui se différencient des autres espèces du genre par la taille et la morphologie des pièces haptoriales (anchor dorsal et ventral, barre dorsale et ventrale et de l’appareil génital mâle. Nous décrivons dans ce travail ces trois nouvelles espèces : Bouixella gorei n. sp., Bouixella yaoi n. sp. et Bouixella koutouani n. sp.

  6. Length-weight and length-length relationships of seven loach species (Teleostei: Cypriniformes from five localities in northern Western Ghats, India

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    Ashwini Keskar

    2015-12-01

    Full Text Available Length-weight (LWR and length-length (LLR relationships of seven loach species (Teleostei: Cypriniformes: Botia striata, Lepidocephalichthys thermalis, Paracanthocobitis mooreh, Indoreonectes evezardi, Nemacheilus anguilla, Nemachilichthys rueppelli and Schistura denisoni were studied from five localities within the Krishna River system of the Indian Western Ghats: Lonawala (Indrayani River, Paud (Mula River, Warje (Mutha River, Bhor (Nira River and Patan (Koyna River.  With the exception of L. thermalis all species are endemic to peninsular India, and to our knowledge this is the first presentation of LWR and LLR data for them.  New maximum lengths are also reported for I. evezardi, N. anguilla, N. rueppelli and S. denisoni. 

  7. Influence of season, size and sex on the dynamic of gill metazoan parasite infesting the Balistes capriscus (Teleostei: Balistidae of the Gulf of Gabès (Tunisia

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    Hichem Kacem

    2015-04-01

    Full Text Available Objective: To investigate the effects of season, size and sex on the dynamic of gill metazoan parasite infesting the Balistes capriscus (Gmelin, 1788 (Teleostei: Balistidae (B. capriscus of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea. Methods: A parasitological survey of the grey triggerfish B. capriscus from the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea was conducted monthly from June 2011 to June 2012. A total of 1080 fish were collected from commercial catches by pelagic trawl net at different fishing ports at Chebba (34°14' N, 11°06' E, Kerkennah (34°45' N, 11°17' E and Zarzis (33°41' N, 11°48' E. The weight, size, sex, date and area of capture of each specimen were recorded. Then, B. capriscus was examined to search for ectoparasites. For each parasite species, parasitological indices were calculated. Results: The parasite species are indentified as two copepods: Naobranchia variabilis, Taneacanthus ballistae and a monogenean: Ancyrocephalus balisticus. The parasitological indices depend significantly on seasonality; the highest prevalence of Naobranchia variabilis, Taneacanthus ballistae and Ancyrocephalus balisticus (28.89%, 35.93% and 55.56% respectively was recorded during summer season (June–August, while the lowest prevalence of each (6.3%, 4.44%, 8.15% recorded during winter season (December–February. Furthermore the parasitological indices depend significantly on the host size but not on host sex. Conclusions: Our data suggest that the dynamic of gill metazoan parasite infesting B. capriscus is a result of a complex of biotic and abiotic factors. It is the first study on the effects of season, size and sex on the dynamic of gill metazoan parasite infesting B. capriscus (Teleostei: Balistidae of the Gulf of Gabès (Southern Tunisia, Central Mediterranean Sea.

  8. Crecimiento y mortalidad natural del pez Haemulon aurolineatum (Teleostei: Haemulidae del suroeste de la isla de Margarita, Venezuela

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    Edwis Bravo

    2009-09-01

    Full Text Available Se determinó el crecimiento y la mortalidad natural del cují (Haemulon aurolineatum del suroeste de la isla de Margarita, entre julio 2005 hasta junio 2006, para lo cual se analizó una muestra de 2 541 ejemplares colectados de la pesca artesanal de Boca del Río. La relación talla-peso entre machos y hembras no mostró diferencias significativas en las pendientes "b" (p>0.05, ts = -1.69 ni en los interceptos "a" (p>0.05, ts = -1.01, por lo que se estableció una relación común para ambos sexos, expresada mediante el modelo P = 0.038*LT2.87. A partir de los datos de distribución de frecuencia de tallas se estimó la longitud asintótica (L∞ con la rutina de Powell-Wetherall, y el coeficiente de crecimiento (k con la rutina ELEFAN I (Gayanilo et al.1996. Se empleó el análisis de la progresión modal, previa descomposición de la frecuencia de longitudes de acuerdo al método de Bhattacharya (1967, y se optimizaron las estimaciones de L∞ y k según Gulland y Holt (1959. Los parámetros de crecimiento estimados (L∞ = 24.2 cm y k = 0.48 año-1 mostraron un crecimiento moderadamente rápido. Los datos de frecuencias de longitudes fueron ajustados al modelo de von Bertalanffy (1960, mostrando una tendencia de tipo exponencial, donde se observó un crecimiento acelerado hasta los 2 años de edad, que luego se hizo lento a medida que el pez alcanzó la longitud máxima. La tasa de mortalidad natural fue alta (M = 1.15 año-1, probablemente causada por alta depredación.Growth and natural mortality of the fish Haemulon aurolineatum (Teleostei: Haemulidae in the Southwest of Margarita Island, Venezuela. We analyzed the growth and natural mortality of the cují (Haemulon aurolineatum in the southwest of Margarita Island, from July 2005 through June 2006. A sample of 1 378 males and 1 143 females collected from Boca del Río artisanal fishing vessels was analyzed. The common relation for both sexes was expressed by the equation P=0.038*L2

  9. Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia, a hyperparasite of Podocotyloides magnatestis (Trematoda, a parasite of Parapristipoma octolineatum (Teleostei

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    Toguebaye Bhen Sikina

    2014-01-01

    Full Text Available Nosema podocotyloidis n. sp. (Microsporidia, Nosematidae is described from Podocotyloides magnatestis (Trematoda: Opecoelidae, a parasite of the fish Parapristipoma octolineatum (Teleostei in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast. The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1–4.0 × 2.58 (1.8–3.3 μm. Their wall is 100–300 nm thick. The polar tube is isofilar with 11–16 coils, 130–155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes.

  10. Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia), a hyperparasite of Podocotyloides magnatestis (Trematoda), a parasite of Parapristipoma octolineatum (Teleostei).

    Science.gov (United States)

    Toguebaye, Bhen Sikina; Quilichini, Yann; Diagne, Papa Mbagnick; Marchand, Bernard

    2014-01-01

    Nosema podocotyloidis n. sp. (Microsporidia, Nosematidae) is described from Podocotyloides magnatestis (Trematoda: Opecoelidae), a parasite of the fish Parapristipoma octolineatum (Teleostei) in the Atlantic Ocean. Electron microscopy reveals that all the stages of the cycle (merogony and sporogony) are diplokaryotic and in direct contact with the cytoplasm of host cells. There is no sporophorous vesicle (pansporoblast). The earliest stages observed are meronts, which have a simple plasmic membrane. Their cytoplasm is granular, rich in ribosomes and contains some sacculi of endoplasmic reticulum. They divide by binary fission into diplokaryotic sporonts. The sporonts have a thick electron-dense wall. Their diplokaryon is slightly less electron-dense than the cytoplasm. The cytoplasm of more advanced sporonts has numerous electron-lucent vesicles. Sporonts with two diplokarya divide by binary fission into diplokaryotic sporoblasts. The older sporoblasts are irregular or elongate and the polar filament is in formation. Their cytoplasm is denser, with ribosomes and lamellae of granular endoplasmic reticulum. The sporoblasts evolve into spores. The mature spores are broadly oval and measure 3.6 (3.1-4.0) × 2.58 (1.8-3.3) μm. Their wall is 100-300 nm thick. The polar tube is isofilar with 11-16 coils, 130-155 nm in diameter and arranged in many layers in the centre of the spore. The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs. The posterior vacuole, with an amorphous electron-dense content, is present. The new species is compared with other species of Nosema from trematodes. B.S. Toguebaye et al., published by EDP Sciences, 2014

  11. Integrative taxonomy identifies a new species of Phyllodistomum (Digenea: Gorgoderidae) from the twospot livebearer, Heterandria bimaculata (Teleostei: Poeciliidae), in Central Veracruz, Mexico.

    Science.gov (United States)

    Razo-Mendivil, Ulises; Pérez-Ponce de León, Gerardo; Rubio-Godoy, Miguel

    2013-12-01

    Phyllodistomum inecoli n. sp. is described from the twospot livebearer, Heterandria bimaculata (Teleostei: Poeciliidae), collected in the Río La Antigua basin, Veracruz, Mexico. The new species is described and characterised by using a combination of morphology, scanning electron microscopy, and sequences of nuclear and mitochondrial genes. Diagnostic characters of the new species of Phyllodistomum include a genital pore opening at the level of the caecal bifurcation; oval vitellarium, situated just posterior to the ventral sucker and not extended laterally and anterior extracaecal uterine loops variable in extension (reaching the anterior, median or posterior margin of the ventral sucker). P. inecoli n. sp. most closely resembles P. brevicecum, a species described as a parasite of the central mudminnow, Umbra limi, in other parts of North America; however, the genital pore in P. brevicecum is situated between the caecal bifurcation and the ventral sucker, the ovary is larger, the vitellarium is lobed and extended laterally and the anterior portion of the uterus extends to the posterior margin of the ventral sucker. Comparison of about 1,500–2,200 nucleotides of cox1 and 28S rDNA and ITS1 strongly supports the status of P. inecoli as a new species. Bayesian inference analysis of combined datasets of 28S rDNA and cox1 sequences showed that P. inecoli n. sp. and the other species found in freshwater fishes of Mexico, including the species complex of P. lacustri, are not sister species. Phylogenetic analysis based on 28S rDNA sequences of several gorgoderid taxa revealed the close relationship of P. inecoli n. sp. with several species of Phyllodistomum, Gorgodera and Gorgoderina with cystocercous cercariae developing in sphaeriid bivalves. Dot-plot analysis of ITS1 sequences of P. inecoli n. sp. revealed the presence of eight repetitive elements with different length, which together represent almost half the length of ITS1.

  12. Catálogo dos Peixes Marinhos do Laboratório de Ictiologia da Universidade Federal do Rio de Janeiro. Parte I: Chondrichthyes (Rajiformes. Teleostei (Elopiformes a Dactylopteriformes

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Duarte Lopes

    1989-01-01

    Full Text Available The present paper is the first part of the catalogue of marine fishes belonging to the collection of the Laboratory of Ichthyology (Universidade Federal do Rio de Janeiro-RJ to be published. Here are included Chondrichthyes (Rajiformes and part of Osteichthyes, Teleostei (Elopiformes to Dactylopteriformes in a total amount of 30 families, 52 genera and 62 species. The most part of the material have been collected at the littoral of the State of Rio de Janeiro. For each species considered is given the vulgar name (when known in Southeastern Brazil, the known distribution (in Western Atlantic Ocean and some data as collecting locality, total number of collected specimens and the register number in the collection. Scorpaena isthmensis Meek & Hildebrand, 1928 (Scorpaenidae is for the first time mentioned for the Southern littoral of Brazil.

  13. Gyrodactylus salinae n. sp. (Platyhelminthes: Monogenea infecting the south European toothcarp Aphanius fasciatus (Valenciennes (Teleostei, Cyprinodontidae from a hypersaline environment in Italy

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    Huyse Tine

    2011-06-01

    Full Text Available Abstract Background Historically, non-native species of Gambusia (Poeciliidae have been used to control larval stages of the Asian tiger mosquito, Stegomyia albopicta Reinert, Harbach et Kitching, 2004 throughout Italy. The potential utility of indigenous populations of Aphanius fasciatus (Valenciennes (Teleostei: Cyprinodontidae as an appropriate alternative biological control is currently being explored. A sub-sample of ten fish collected from Cervia Saline, Italy (salinity 65 ppt; 30°C to assess their reproductive capability in captivity, harboured a moderate infection of Gyrodactylus von Nordmann, 1832 (Platyhelminthes, Monogenea. A subsequent morphological and molecular study identified this as being a new species. Results Gyrodactylus salinae n. sp. is described from the skin, fins and gills of A. fasciatus. Light and scanning electron microscopical (SEM examination of the opisthaptoral armature and their comparison with all other recorded species suggested morphological similarities to Gyrodactylus rugiensoides Huyse et Volckaert, 2002 from Pomatoschistus minutus (Pallas. Features of the ventral bar, however, permit its discrimination from G. rugiensoides. Sequencing of the nuclear ribosomal DNA internal transcribed spacers 1 and 2 and the 5.8S rRNA gene and a comparison with all species listed in GenBank confirmed they are unique and represent a new species (most similar to Gyrodactylus anguillae Ergens, 1960, 8.3% pair-wise distance based on 5.8S+ITS2. This represents the first species of Gyrodactylus to be described from Aphanius and, to date, has the longest ITS1 (774 bp sequenced from any Gyrodactylus. Additional sampling of Cervia Saline throughout the year, found G. salinae n. sp. to persist in conditions ranging from 35 ppt and 5°C in December to 65 ppt and 30°C in July, while in captivity a low level of infection was present, even in freshwater conditions (0 ppt. Conclusions The ability of G. salinae n. sp. to tolerate a wide

  14. Daily feeding periodicity of the intertidal goby Caffrogobius caffer

    African Journals Online (AJOL)

    Hobson (1965) noted that some species of inshore fish in the Gulf of California were nocturnal, while others were diurnal or crepuscular in habits. Domm & Domm (1973) found that light intensity affected the activity of tropical reef fish. These latter authors examined the dawn and dusk behaviour of reef fish and their results ...

  15. Listeric septicaemia and abotion in African buffalo ( Syncerus caffer ...

    African Journals Online (AJOL)

    ... this L. monocytogenesacquisition is possible cause of the septicemia and abortion in the African buffalo. Consequently listeriosis in wildlife deserves further investigation in Nigeria. Keywords: Listeria monocytogenes, listeriosis, African buffalo, septicemia, abortion > Animal Production Research Advances Vol. 2 (4) 2006: ...

  16. Paracreptotrema profundulusi n. sp. and P. blancoi Choudhury, Pérez-Ponce De León, Brooks, and Daverdin, 2006 (Trematoda: Allocreadiidae) from freshwater fishes of the genus Profundulus (Teleostei: Profundulidae) in southern México.

    Science.gov (United States)

    Salgado-Maldonado, Guillermo; Caspeta-Mandujano, Juan Manuel; Martínez-Ramírez, Emilio

    2011-08-01

    Paracreptotrema profundulusi n. sp. (Trematoda: Allocreadiidae) is described from the intestine of the freshwater fishes Profundulus punctatus and P. balsanus (Teleostei: Profundulidae) from the Tehuantepec and the Atoyac-Verde River basins, in Oaxaca, México, in the western extreme of Central America. The new species is distinguished from Paracreptotrema blancoi Choudhury, Pérez-Ponce de León, Brooks, and Daverdin, 2006 , to which it is most similar, and from P. mendezi (Sogandares-Bernal, 1955) Choudhury, Pérez-Ponce de León, Brooks, and Daverdin, 2006 , by the caeca extending beyond the testes, vitelline follicles that invade the postesticular area, and uterus with transverse loops located mainly between the testes and the genital pore. Paracreptotrema blancoi was collected from the same host species and also from Profundulus oaxacae. Here, we provide data that show its broad distribution in several river basins of Neotropical southern México, including the Papagayo River basin, Guerrero, México, and the Atoyac-Verde and Tehuantepec river basins, and other rivers in Oaxaca, México. Freshwater fishes of the Profundulidae are endemic to Central America and host a helminth fauna that includes at least 4 species found only in these hosts.

  17. COMPARAÇÃO ENTRE OS MÉTODOS DE EXTRAÇÃO DE METACERCÁRIAS DE ASCOCOTYLE SP (TREMATODA: DIGENEA DOS TECIDOS DE MUGIL LIZA VALENCIENNES, 1836 (TELEOSTEI: MUGILIDAE

    Directory of Open Access Journals (Sweden)

    Renato Ribeiro Nogueira Ferraz

    2014-09-01

    Full Text Available The demand and consumption of fish and their derivatives has increased considerably in recent years. However, fish are ideal hosts of numerous parasites, highlighting the need to develop new research methodologies for its detection. The aim of present study was to compare the efficacy of Ascocotyle metacercariae (Trematoda: Digenea extraction from visceral tissues of Mugil liza Valenciennes, 1836 (Teleostei: Mugilidae by two methods: homogenization by blender or mixer. Twentysix samples of M. liza were collected, being 16 liver samples and 10 samples of muscle tissue. Approximately 5g of each sample were processed by blender and mixer techniques homogenization for metacercariae extraction. In liver samples, up to 46 metacercariae were found in samples homogenized in blender. The lowest amount found was 2 metacercariae for blender and mixer techniques. In samples of muscle tissue, 4 metacercariae were observed in the mixer extraction. The lowest amount was found to be 2 parasites to blender and mixer. The mean metacercariae found and extracted from muscle tissue were 0.2 (+0.357 and 1.2 (+0.963 for blender and mixer, respectively. The averages of metacercariae found and extracted from fish liver, in blender and mixer, were 24 (+15.145 and 18 (+8.246, respectively. The homogenization techniques for blender and mixer were effective for the extraction of metacercariae of mullet fish tissues, suggesting that they may be directly applicable in the field of study, especially due to the ease of testing.

  18. A specimen of Paralycoptera Chang & Chou 1977 (Teleostei: Osteoglossoidei from Hong Kong (China with a potential Late Jurassic age that extends the temporal and geographical range of the genus

    Directory of Open Access Journals (Sweden)

    Tze-Kei Tse

    2015-03-01

    Full Text Available We describe a Mesozoic fish Paralycoptera sp. (Teleostei: Osteoglossoidei, on the basis of a postcranial skeleton collected from the volcaniclastic mudstones of the Lai Chi Chong Formation of Hong Kong, China. The new finding—representing the city’s first Mesozoic fish—extends the geographical distribution of Paralycoptera from eastern mainland China into Hong Kong, demonstrating a wider distribution than previously appreciated for this genus. A radiometric age for the Lai Chi Chong Formation of 146.6 ± 0.2 Ma implies a temporal range expansion for Paralycoptera of approximately 40 million years back from the Early Cretaceous (∼110 Ma. However, spores found in the Formation suggest an Early Cretaceous age that is consistent with the existing age assignment to Paralycoptera. We argue that the proposed temporal range extension is genuine because it is based on recent high precision radiometric age data, but given the discrepancies with the biostratigraphic ages further investigation is needed to confirm this. This study provides an important step towards revealing Hong Kong’s Mesozoic vertebrate fauna and understanding its relationship to well-studied mainland Chinese ones.

  19. Cryptic Ponto-Caspian Bighead Gobies (genus Ponticola, Gobiidae, Perciformes

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    Dmitry Alexandrovich Medvedev

    2015-11-01

    In this way, P. iljini, P. gorlap, and P. kessleri represent a group of distinct allopatric cryptic species with very low morphological divergence. The start of the divergence between P. kessleri and the Caspian species can be dated no earlier than the end of the Miocene (5.8-5.0 million years ago when the Pontian sea-lake has divided into two separate brackish pools: the later Pontian sea-lake basin and Babadzhanskoe sea-lake in the southern part of the Caspian depression. But, at the same time, it can be dated not later than Pleistocene (2.0-0.7 Ma, when the last connection of the Caspian and the Black Sea through the Manych has been stopped. The ancestors of P. iljini could penetrate to the east coast of the Caspian Sea during the period of the largest transgressions, Akchagyl (2.5-2.0 Ma or Apsheron (2.0-0.7 Ma. Their isolation in the Mangyshlak Peninsula region from other Caspian Bighead goby populations has been provided by two hypersaline bays, limiting the peninsula from the north (Mërtvyj Kultuk and Kajdak bays with salinity of 30 ‰ and above and from the south (Kara-Bogaz-Gol Bay with salinity of 300-350 ‰ and above, as well as the lack of a network of rivers on the peninsula.

  20. Genetic and phylogenetic analysis of ten Gobiidae species in China ...

    African Journals Online (AJOL)

    Administrator

    2011-09-07

    Sep 7, 2011 ... 10532 Afr. J. Biotechnol. Table 1. Sampling information of gobioid fishes including sampling sites, date of collection and sample size. Species. ID. Sampling site. Date of collection. Sample size .... to “eel gobioid fishes” or “worm gobioid fishes” because of their elongate bodies with a continuous dorsal fin.

  1. Genetic and phylogenetic analysis of ten Gobiidae species in China ...

    African Journals Online (AJOL)

    To study the genetic and phylogenetic relationship of gobioid fishes in China, the representatives of 10 gobioid fishes from 2 subfamilies in China were examined by amplified fragment length polymorphism (AFLP) analysis. We established 220 AFLP bands for 45 individuals from the 10 species, and the percentage of ...

  2. Genetic and phylogenetic analysis of ten Gobiidae species in China ...

    African Journals Online (AJOL)

    Administrator

    2011-09-07

    Sep 7, 2011 ... To study the genetic and phylogenetic relationship of gobioid fishes in China, the representatives of 10 ... In recent studies, molecular markers have been proved to ... fragments of mitochondrial DNA have been success.

  3. Life cycle of the pelagic goby Aphia minuta (Pisces: Gobiidae

    Directory of Open Access Journals (Sweden)

    M. Iglesias

    2001-09-01

    Full Text Available Reproductive aspects of the transparent goby Aphia minuta (n=2977, 14-45 mm total length (TL were studied in Majorcan waters, western Mediterranean, during the fishing season (December to April from 1985 to 1993. Male:female sex ratio was 1:1. Size at first maturity was 38 mm TL for females and 34 mm TL for males. Oocyte size-frequency distribution indicated that A. minuta is a single spawner. Fecundity of A. minuta ranged from 935 to 2648 oocytes. The breeding season extended from December to April with a peak in March. After a single reproduction at 5-6 months of age, most of the specimens disappeared from the fishing areas. Recruitment to the fishing area occurred in late December and early January (14-24 mm TL, age 2-3 months. On the other hand, the hatch date back-calculated from the age in days and the date of capture of individuals of A. minuta during the fishing season, indicated a spawning peak in autumn (September-October, six months after the peak of observed spawning. Schools of A. minuta were detected by acoustic methods, during the fishing season (winter-spring in fishing areas (5-40 m depth, principally inside bays, and during the rest of the year (summer and autumn in deeper areas (40-90 m, outside bays, with water temperatures between 13 and 16ºC and a high seasonal productivity in each depth range. Therefore, we propose that A. minuta has two annual cohorts in the western Mediterranean, corresponding to two main spawning in spring and autumn, respectively. Life history pattern indicated that we only know the winter cohort resulting from the autumn spawning. Meanwhile the summer cohort (spring spawning grows and reproduces in deeper areas not being targeted by the fishery. Indirect validation is provided from information from other areas. The relevance of the life cycle is discussed in relation to fishery management.

  4. cus Smith, 1961 (Teleostei, Apogonidae)

    African Journals Online (AJOL)

    1992-01-13

    Jan 13, 1992 ... drainages of the Santa Margarita, Sweetwater, and Tijuana. Rivers. In California, X. laevis form dense populations (McCoid. & Fritts I 980b). A contributing factor to the species' success in California appears to be reproductive strategies. Breeding in X. laevis is opportunistic and ovulation asyn- chronous ...

  5. Notes on rumen contents of Cape Buffalo Syncerus Caffer in the Addo Elephant National Park

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    G. de Graaf

    1973-07-01

    Full Text Available The oesophagus and rumen contents of 18 Capebuffalo that died during the 1969/70 drought in the Addo Elephant National Park near Port Elizabeth were analysedand are discussed as regards a description, based on quantitativedata, of the main vegetation types in the Park. Notes on plantspecies that were observed being utilised by buffalo are also given.

  6. Captive breeding of the white rhinoceros, Ceratotherium simum, and the Cape buffalo, Syncerus caffer : research communication

    Directory of Open Access Journals (Sweden)

    J.D. Skinner

    2006-09-01

    Full Text Available Breeding records of 40 white rhinoceros and 155 Cape buffalo were analysed. Three rhinoceros cows bred in captivity, themselves conceived for the first time at 84, 87 and 95 months of age, respectively. Rhinoceros cows breed throughout the year. There is no evidence of a relationship between calving interval and month of birth. Calving intervals were normally distributed about the mean of 34 months and there were no significant differences between bulls, cows or sex of calf. There was no difference in the sex ratio of calves born to young cows nor older cows. The male:female ratio of the calves was Younger cows did not have shorter birth intervals. Although captive Cape buffaloes breed throughout the year, there is a preponderance of births in midsummer. There was some evidence that larger cows produce heavier calves and that season of birth may influence birth weight. Male calves weighed 41.20 + 0.68 kg vs 39.00 + 0.73 kg (range 24-60 kg for female calves but this difference was not significant. Calving intervals were normally distributed about the mean of 395 days and the male:female ratio of the calves was 1:1.2.

  7. Sex and age data from cropping of Buffalo Syncerus caffer in the Kruger National Park

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    D.R Mason

    1984-12-01

    Full Text Available Sex and age classifications of buffalo cropped in the Kruger National Park suggest that cropping is biased towards females, and prime breeding individuals of both sexes are apparently under-represented. The implications are discussed in relation to buffalo social organisation and comparative data on population structure.

  8. Variation of mitochondrial DNA in the Hipposideros caffer complex (Chiroptera: Hipposideridae) and its taxonomic implications

    Czech Academy of Sciences Publication Activity Database

    Vallo, Peter; Guillén-Servent, A.; Benda, P.; Pires, D. B.; Koubek, Petr

    2008-01-01

    Roč. 10, č. 2 (2008), s. 193-206 ISSN 1508-1109 R&D Projects: GA AV ČR IAA6093404 Institutional research plan: CEZ:AV0Z60930519 Keywords : leaf-nosed bats * Africa * cryptic species * cytochrome b * molecular systematics * phylogeny Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 0.825, year: 2008

  9. (Teleostei; Clinidae) in intertidal rock pools

    African Journals Online (AJOL)

    Factors affecting species richness and abundance of clinid fish(Fam. Clinidae)in 19 intertidal rock pools near Muizenberg, South Africa, were investigated. Some measure of cover is the most important predictor of clinid species richness, abundance and biomass. Intraspecific partitioning of habitat by Clinus superciliosus ...

  10. (Teleostei: Cyprinid) from the Koukoum River, Cameroon

    African Journals Online (AJOL)

    SARAH

    2016-05-31

    May 31, 2016 ... Methodology and Results: After host sampling and parasites mounting, determination of various monogenean ... The impact of host sex was observed forD. amieti and Dogielius njinei parasite load. ..... Interactions durables.

  11. Management advice for the Diplotaxodon limnothrissa (Teleostei ...

    African Journals Online (AJOL)

    Diplotaxodon limnothrissa is a widely distributed species occurring throughout Lake Malawi and is probably the most abundant cichlid in the pelagic zone of the lake. The species is exploited commercially in the south-east arm of the lake, but since the fishery's inception the resource has never been assessed. Per-recruit ...

  12. A new sandperch, Parapercis maritzi (Teleostei: Pinguipedidae ...

    African Journals Online (AJOL)

    1992-01-15

    Jan 15, 1992 ... m, Mr Willie Maritz aboard Playa de Galicia, 14-20 June. 1990. Paratypes: RUSI 37319, (5; 131-167 mm SL), SAM 32442,. (2; 128-134 mm SL), BPBM 34911. (2; 130 & 158 mm. SL), all collected with holotype. RUSI 37043, 81 mm SL, juvenile, Natal, ofT Cape Vidal, 28008.3'S/32~6.9'E, dredge in 200 m, ...

  13. Nothobranchius cooperi (Teleostei: Cyprinodontiformes): a new ...

    African Journals Online (AJOL)

    Males of Nothobranchius cooperi are distinguished from congeners by the following unique combination of characters: body scales with broad orange posterior margin, forming a highly irregular cross-barred pattern; anal fin fairly uniform orange-red with irregular to regular, light blue-green zone close to the base; caudal ...

  14. Biologia do jundiá Rhamdia quelen (Teleostei, Pimelodidae Biology of Rhamdia quelen (Teleostei, Pemelodidae

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    Levy de Carvalho Gomes

    2000-03-01

    Full Text Available O jundiá, Rhamdia quelen, é encontrado desde o centro da Argentina até o sul do México, e seu cultivo está aumentando no sul do Brasil. Portanto, o objetivo desta revisão é apresentar os dados existentes até o momento sobre a biologia dessa espécie. R. quelen pode atingir 50cm de comprimento e 3kg de peso, possui hábito noturno e habita locais calmos e profundos dos rios. Os alevinos suportam água do mar a 10%o, até 9,0g/l de sal comum e pH na faixa de 4,0 a 8,5, com melhor crescimento das larvas na faixa de pH de 8,0 a 8,5. É uma espécie euritérmica. Esse peixe é omnívoro, com tendência piscívora. A maturidade sexual é atingida no primeiro ano de vida. É uma espécie ovulípara e, na natureza, os cardumes desovam em locais com água limpa, calma e de fundo pedregoso. Não apresenta cuidado parental. Possui dois picos reprodutivos por ano (um no verão e outro na primavera e desova múltipla. A indução da desova apresentou bons resultados com gonadotrofina coriônica humana (HCG ou extrato hipofisário. O desenvolvimento embrionário de R. quelen é rápido e se dá entre 3 a 5 dias. O melhor alimento artificial para larvas de R. quelen é baseado em lecitina de soja, fígado bovino e levedura. Várias bactérias patogênicas e trematódeos digenéticos já foram identificados em R. quelen. Para um melhor aproveitamento dessa espécie na piscicultura, são necessários mais estudos relacionados ao efeito de parâmetros físicoquímicos da água, alimentação artificial e crescimento em cativeiro.The jundiá, Rhamdia quelen, occurs from Southern Mexico to Central Argentina, and the husbandry of this species is spreading in Southern Brazil. Consequently, the aim of this review is to present the available data of the biology of this species. R. quelen can reach 50cm of length and 3kg of weight, presents a nocturnal habit and lives in placid and deep waters of the rivers. Fingerlings support 10‰ seawater, up to 9g/l table salt and 4.0 - 8.5 pH range, with best growth at 8.0 - 8.5 pH range. It is an eurytermal species. This fish is omnivorous, but prefers fish. The sexual maturity is reached in the first year of life, and it is ovuliparous and in the natural environment the schools spawn in clean and calm waters with rocky bottom. There is no parental care. This species shows two reproductive peaks/year (spring and summer and multiple spawning. The induced spawning had good results with human chorionic gonadotrofin (HCG or pituitary extract. The embriological development of R. quelen is fast, and the larval development occurs in three to five days. The best feeding ration to the larvae of R. quelen is based on soybean lecithin, cattle liver and yeast. Several pathogenic bacteria and digenetic trematoda were identified in R. quelen. To improve the use of this species in fish culture, additional studies about physico-chemical parameters of the water, feeding rations and growth in captivity are essential.

  15. Age and growth of Aphia minuta (Pisces, Gobiidae from the central Adriatic Sea

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    M. La Mesa

    1999-06-01

    Full Text Available Aphia minuta (Risso, 1810 is by far the most common pelagic gobiid of the Adriatic Sea and it is seasonally exploited by some local small-scale fishing fleets. Despite this, very few data on its biology in this area have been reported to date. Accordingly, age and growth of A. minuta were investigated by counting microincrements (daily rings in the sagittal otoliths of 262 specimens caught in the central Adriatic between May 1996 and March 1997. Age of fish from 14 to 55 mm total length ranged between 42 and 275 days, confirming the short life span of this species. The von Bertalanffy growth parameters estimated by the age-length data pairs for the whole population were: L = 68.7 mm; K = 1.55 year-1; t0 = 0.077 year. The analysis of the monthly length-frequency distributions showed the simultaneous presence in late spring-early summer of two main cohorts which, together with the back-calculated hatch date distribution, indicated a more extended spawning period than previously reported in the literature. Because the fishery for A. minuta in the central Adriatic exploits the spawning stock it should be monitored and, if necessary, regulated.

  16. Feeding ecology of the transparent goby Aphia minuta (Pisces, Gobiidae in the northwestern Adriatic Sea

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    Mario La Mesa

    2008-03-01

    Full Text Available The feeding ecology of the transparent goby Aphia minuta was examined in spring (May 2003 in the coastal waters off Comacchio, in the northwestern Adriatic Sea. Stomach content analysis indicated A. minuta to be a planktivorous species, feeding exclusively on pelagic invertebrates. The diet composition was dominated by the calanoid copepods Acartia clausi and Temora longicornis, followed in decreasing order of importance by other copepods (especially calanoids and Oncaea spp. and larvae of decapods, polychaetes and bivalves. A. minuta exhibited a generalistic feeding strategy with a relatively broad niche width. Abundant taxa in the environment, such as A. clausi and T. longicornis, were seldom selected, whereas rare taxa, such as larvae of polychaetes and decapods, were highly selected. According to the observed ontogenetic shift in diet, small-size individuals relied preferentially on juvenile T. longicornis and Oncaea spp., whereas large-sized specimens consumed preferably A. clausi and calanoids. The positive relationship found between prey and fish size may help to mitigate the intraspecific competition for food resources.

  17. The Review of Ecological and Genetic Research of Ponto-Caspian Gobies (Pisces, Gobiidae in Europe

    Directory of Open Access Journals (Sweden)

    Jakšić Goran

    2016-09-01

    Full Text Available Invasive Ponto-Caspian gobies (monkey goby Neogobius fluviatilis, round goby Neogobius melanostomus and bighead goby Ponticola kessleri have recently caused dramatic changes in fish assemblage structure throughout European river systems. This review provides summary of recent research on their dietary habits, age and growth, phylogenetic lineages and gene diversity. The principal food of all three species is invertebrates, and more rarely fish, which depends on the type of habitat, part of the year, as well as the morphological characteristics of species. According to the von Bertalanffy growth model, size at age is specific for the region, but due to its disadvantages it is necessary to test other growth models. Phylogenetic analysis of monkey goby and round goby indicates separation between the Black Sea and the Caspian Sea haplotypes. The greatest genetic diversity is found among populations of the Black Sea, and the lowest among European invaders. The lack of molecular research on bighead goby requires further studies.

  18. Reproductive biology of the striped goby, Gobius vittatus (Gobiidae in the northern Adriatic Sea

    Directory of Open Access Journals (Sweden)

    Marcelo Kovacic

    2007-03-01

    Full Text Available The striped goby, Gobius vittatus Vinciguerra, 1883 is a Mediterranean gobiid species considered to be rare and lacking in data on its reproduction. Sex ratio, length and age at first maturity, annual cycle of gonad development, spawning period and fecundity of G. vittatus were studied on 704 specimens collected by SCUBA diving in the northern Adriatic Sea (Kvarner area from April 2001 to March 2002. The monthly sex ratio did not differ significantly, except during the spawning season, when it was strongly biased in favour of females. The estimated length at first maturity was 32.8 and 35.4 mm for females and males, respectively. In both sexes gonad development started in the first year of life. All specimens were mature by the third year. The spawning season was from April to July. Total fecundity ranged from 560 to 3045, with an average of 1426 ± 89 ripe eggs/fish. The simultaneous presence of three clearly distinct sizes of oocytes in ripe ovaries indicate that this species is a multiple spawner.

  19. First Record of Two Gobiid Fishes, Luciogobius elongatus, L. platycephalus (Perciformes: Gobiidae from Korea

    Directory of Open Access Journals (Sweden)

    Seung-Ho Choi

    2014-01-01

    Full Text Available Two species of small gobiid fishes genus Luciogobius, i.e., L. elongatus, L. platycephalus were described as the first records from Korea based on specimens collected from gravel beaches of Gijang-gun, Busan-si, Korea. Luciogobius elongatus is distinguished from congeners by very elongated and naked body, 42-44 vertebrae, 6-7 dorsal soft rays, and no free rays on pectoral fin, and L. platycephalus is characterized by having very depressed head, naked body, 40-41 vertebrae, 10-11 dorsal soft rays, and pectoral fin with only upper 2-4 free rays. We propose the new Korean name “Ga-neun-mi-kkeun-mang-dug”, “Nab-jak-mi-kkeunmang- dug” for L. elongatus and L. platycephalus, respectively.

  20. Description of a small goby, Trimma grammistes (Perciformes: Gobiidae), from Jeju Island, Korea

    Science.gov (United States)

    Kim, Byung Jik; Choi, Seung-Ho; Kim, Sung

    2013-06-01

    A small goby, Trimma grammistes, was described in detail as the first reliable record from Korea based on 10 specimens (27.8˜34.0 mm SL) collected from the coastal waters of Jeju Island. The species is easily differentiated from congeners by having no scales on the predorsal region, VI-I, 10 dorsal fin rays modally, I, 10 anal fin rays, 18 pectoral fin rays, 27˜30 longitudinal scales as well as two dark longitudinal bands on the body.

  1. Corrections and clarifications to the descriptions of Biendongella and Sovvityazius (Perciformes: Gobiidae).

    Science.gov (United States)

    Murdy, Edward O

    2017-06-09

    Prokofiev (2015a) described two new genera and species of Amblyopinae and reported new amblyopine records from waters off Indonesia, the Philippines, and Vietnam. In reviewing Prokofiev's figures and reading the descriptions of his new genera, Biendongella Prokofiev, 2015 and Sovvityazius Prokofiev, 2015, it appeared likely that these new taxa were based on species also under examination by Koichi Shibukawa and me. However, some differences existed between our specimens and those described by Prokofiev in the pterygiophore formula (DF), the presence/absence of hypural 5, and the number of epurals. The data and information on these characters were not abundantly clear from the text and clarification was needed. For example, on page 786 of Prokofiev (2015a) the following diagnostic feature of Biendongella was provided, "DF 3 1221, vacant interneural gap between spined and soft parts of D present; two first pterygiophores of soft part of D each located in its interneural gap…". Similar wording exists for Sovvityazius on page 789, "DF 3 1221, vacant gap between spined and soft parts of D present; two first pterygiophores of soft part of D each in its interneural space…". As for hypural 5 and the number of epurals, the same statement is given for both Biendongella and Sovvityazius on pages 786 and 789, respectively, "Hypural 5 and epural 2 absent." These character states struck me as remarkable as they are atypical for amblyopines. With respect to the DF character above, amblyopine gobies with a pterygiophore formula of 3-1221 have no interneural gap and the interneural space immediately posterior to the pterygiophore of the ultimate spinous ray contains two pterygiophores (Murdy 2011). As for the latter characters, hypural 5 and two epurals are present in amblyopine gobies (Shibukawa and Murdy 2012). In a detailed email to Prokofiev, I asked for clarification of these discrepancies and whether Biendongella and Sovvityazius have the amblyopine synapomorphy of the ultimate pterygiophore supporting a single ray (Murdy & Shibukawa 2001), which was not mentioned in the description of either genus.

  2. A new species of Hetereleotris (Perciformes: Gobiidae) from the Red Sea.

    Science.gov (United States)

    Kovačić, Marcelo; Bogorodsky, Sergey V

    2014-02-12

    A new species of the genus Hetereleotris is described from the Gulf of Aqaba, Red Sea, on the basis of two specimens. Hetereleotris psammophila sp. nov. is unique among the species of the genus Hetereleotris, except for H. diademata, in lacking scales and head pores. The new species differs from the morphologically similar H. diademata in having fewer rays in the second dorsal and anal fins, and in coloration. The habitat preference of the new species for open sand area close to coral reefs in 8-21 m and its nocturnal habits are unusual for species of the genus Hetereleotris.

  3. Air breathing of aquatic burrow-dwelling eel goby, Odontamblyopus lacepedii (Gobiidae: Amblyopinae).

    Science.gov (United States)

    Gonzales, Tomas T; Katoh, Masaya; Ishimatsu, Atsushi

    2006-03-01

    Odontamblyopus lacepedii is an eel goby that inhabits both coastal waters and intertidal zones in East Asia, including Japan. The fish excavates burrows in mudflats but, unlike the sympatric amphibious mudskippers, it does not emerge but stays in the burrows filled with hypoxic water during low tide. Endoscopic observations of the field burrows demonstrated that the fish breathed air in the burrow opening; air breathing commenced 1.3 h following burrow emersion, when water P(O2) was approximately 2.8 kPa, with an air-breathing frequency (f(AB)) of 7.3+/-2.9 breaths h(-1) (mean +/- s.d., N=5). Laboratory experiments revealed that the fish is a facultative air breather. It never breathed air in normoxic water (P(O2)=20.7 kPa) but started bimodal respiration when water P(O2) was reduced to 1.0-3.1 kPa. The fish held air inside the mouth and probably used the gills as gas-exchange surfaces since no rich vascularization occurred in the mouth linings. As is known for other air-breathing fishes, f(AB) increased with decreasing water P(O2). Both buccal gas volume (V(B)) and inspired volume (V(I)) were significantly correlated with body mass (M(b)). At a given M(b), V(I) was nearly always equal to V(B), implying almost complete buccal gas renewal in every breathing cycle. A temporal reduction in expired volume (V(E)) was probably due to a low aerial gas exchange ratio (CO2) elimination/O2 uptake). Air breathing appears to have evolved in O. lacepedii as an adaptation to aquatic hypoxia in the burrows. The acquisition of the novel respiratory capacity enables this species to stay in the burrows during low tide and extends the resident time in the mudflat, thereby increasing its chances of tapping the rich resources of the area.

  4. Phylogeography and demographic history of two widespread Indo-Pacific mudskippers (Gobiidae: Periophthalmus).

    Science.gov (United States)

    Polgar, G; Zane, L; Babbucci, M; Barbisan, F; Patarnello, T; Rüber, L; Papetti, C

    2014-04-01

    This study provides a first description of the phylogeographic patterns and evolutionary history of two species of the mudskipper genus Periophthalmus. These amphibious gobies are distributed throughout the whole Indo-Pacific region and Atlantic coast of Africa, in peritidal habitats of soft-bottom coastal ecosystems. Three sequence datasets of two widely distributed species, Periophthalmus argentilineatus and P. kalolo, were obtained by amplifying and sequencing two mtDNA markers (D-loop and 16S rDNA) and the nDNA rag1 region. The three datasets were then used to perform phylogeographic, demographic and population genetic analyses. Our results indicate that tectonic events and past climatic oscillations strongly contributed to shape present genetic differentiation, phylogeographic and demographic patterns. We found support for the monophyly of P. kalolo, and only shallow genetic differentiation between East-African and Indo-Malayan populations of this species. However, our collections of the morphospecies P. argentilineatus include three molecularly distinct lineages, one of them more closely related to P. kalolo. The presence of Miocenic timings for the most recent common ancestors of some of these morphologically similar clades, suggests the presence of strong stabilising selection in mudskippers' habitats. At population level, demographic analyses and palaeoecological records of mangrove ecosystems suggest that Pleistocene bottlenecks and expansion plus secondary contact events of the studied species were associated with recurrent sea transgressions during interglacials, and sea regressions or stable regimes during glacials, respectively. Copyright © 2014 Elsevier Inc. All rights reserved.

  5. Length-weight relationship of mudskippers (Gobiidae: Oxudercinae) in the coastal areas of Selangor, Malaysia

    OpenAIRE

    Khaironizam, M.Z.; Norma-Rashid, Y.

    2002-01-01

    Parameters a and b of the length-weight relationship (LWR) were estimated for eleven species of mudskippers caught in the coastal areas of Selangor, Malaysia. The values of b ranged from 2.56 to 3.50 with the mean b equal to 2.95 (n=11; sd=0.302). A normal distribution of the calculated LWR exponent (b) was obtained.

  6. Gross and fine anatomy of the respiratory vasculature of the mudskipper, Periophthalmodon schlosseri (Gobiidae: Oxudercinae).

    Science.gov (United States)

    Gonzales, Tomas T; Katoh, Masaya; Ghaffar, Mazlan Abd; Ishimatsu, Atsushi

    2011-05-01

    To illustrate vascular modification accompanying transition from aquatic to amphibious life in gobies, we investigated the respiratory vasculatures of the gills and the bucco-opercular cavities in one of the most terrestrially-adapted mudskippers, Periophthalmodon schlosseri, using the corrosion casting technique. The vascular system of Pn. schlosseri retains the typical fish configuration with a serial connection of the gills and the systemic circuits, suggesting a lack of separation of O(2)-poor systemic venous blood and O(2)-rich effluent blood from the air-breathing surfaces. The gills appear to play a limited role in gas exchange, as evidenced from the sparsely-spaced short filaments and the modification of secondary lamellar vasculature into five to eight parallel channels that are larger than red blood cell size, unlike the extensive sinusoidal system seen in purely water-breathing fishes. In contrast, the epithelia of the bucco-opercular chamber, branchial arches, and leading edge of the filaments are extensively laden with capillaries having a short (<10 μm) diffusion distance, which strongly demonstrate the principal respiratory function of these surfaces. These capillaries form spiral coils of three to five turns as they approach the epithelial surface. The respiratory capillaries of the bucco-opercular chamber are supplied by efferent blood from the gills and drained by the systemic venous pathway. We also compared the degree of capillarization in the bucco-opercular epithelia of Pn. schlosseri with that of the three related intertidal-burrowing gobies (aquatic, non-air-breathing Acanthogobius hasta; aquatic, facultative air-breathing Odontamblyopus lacepedii; amphibious air-breathing Periophthalmus modestus) through histological analysis. The comparison revealed a clear trend of wider distribution of denser capillary networks in these epithelia with increasing reliance on air breathing, consistent with the highest aerial respiratory capacity of Pn. schlosseri among the four species. Copyright © 2011 Wiley-Liss, Inc.

  7. Two new species of Trimma (Pisces; Gobiidae) from Fiji, south-western Pacific Ocean.

    Science.gov (United States)

    Winterbottom, Richard

    2017-05-24

    Two new species of Trimma are described from Fiji. Trimma bathum n. sp. lacks scales on the cheeks, opercle and predorsal midline, has 18-19 unbranched pectoral fin rays, an unbranched 5th pelvic fin ray that is 40-56% the length of the 4th ray, 17-18 gill rakers on the outer surface of the first gill arch, a U-shaped interorbital and a narrow slit-like postorbital trench, a low, median fleshy ridge extending half-way towards the orbit from the origin of the first dorsal fin, and, when freshly collected, a pink head and body with most body scales having an orange-brown spot or short bar at their centres. The species is currently known only from off Suva Harbour, Viti Levu, Fiji. Trimma finistrinum n. sp. has a bony interorbital equal to the pupil diameter, a fully scaled nape of 12-14 scales, a second dorsal spine that may reach posteriorly to the middle of the second dorsal fin, the papillae in the longitudinal row immediately below the eye either single or with two papillae in a vertical row, unbranched pectoral fin rays, usually a branched fifth pelvic-fin ray that is about half length of the fourth ray, and a large diffuse dark blotch on the posterior part of the caudal peduncle. A colour pattern of a brownish body with most body scales having golden- to greenish-yellow (pale in preservative) centres is unique among species of the genus. The species is currently recorded only from off the north and east coasts of Viti Levu, Fiji.

  8. Enige metingen over het standaard metabolisme en het actief metabolisme bij Gobiidae

    NARCIS (Netherlands)

    Penning de Vries, F.W.T.

    1969-01-01

    An attempt was made to determine the "scope for activity" -maximal active metabolism minus basal metabolism and its relation to temperature in the three species Pomatoschistus minutus,P.lozanoi and P. microps, in order to find a possible explanation for the difference in their

  9. Ecological Plasticity of Apollonia melanostomus (Pisces, Gobiidae from its Main Habitat Types in Bulgaria

    Directory of Open Access Journals (Sweden)

    Apostolos Apostolou

    2016-12-01

    Full Text Available Three native populations of A. melanostomus from different Bulgarian habitats were analysed, in view to their morphologic, biochemical-genetic variability and resistance in salinity alterations. Freshwater specimens can survive when fresh water (0‰ is changed rapidly by Black Sea water (16-18‰ and marine vice-versa. In view of the salinity resistance A. melanostomus is evaluated as tolerant. Eleven non-enzymatic and 16 enzymatic loci were tested as genetic markers for population identification. Most of them were monomorphic for all populations analysed, with exception of esterases and malate dehydrogenase. These two polymorphic enzyme systems could be used for further analyses of population structure of A. melanostomus. The genetic diversity DNeicompared between three populations was low - 0.005-0.016 and the sample from Durankulak occurred to be more genetically divergent. The morphological and biochemical-genetic variability characteristics of the studied populations do not show correlation, but independently vary according to different environmental factors.

  10. Innate immunity in free-ranging African buffalo (Syncerus caffer): associations with parasite infection and white blood cell counts.

    Science.gov (United States)

    Beechler, Brianna R; Broughton, Heather; Bell, Austin; Ezenwa, Vanessa O; Jolles, Anna E

    2012-01-01

    Mammalian immunology has been studied in great detail in laboratory animals, but few of the tools and less of the insight derived from these studies have been placed in the context of natural, outbred wildlife populations subject to variable environments. We investigated patterns of innate immunity in free-ranging African buffalo in relation to host traits (age, reproductive status, body condition, white blood cell counts) and disease status (bovine tuberculosis [BTB], gastrointestinal nematodes, coccidia, ticks). We evaluated and used an in vitro assay measuring bactericidal competence of blood to assess a component of innate immunity in 200 female buffalo captured at Kruger National Park, South Africa, in June/July and October 2008. Animals with BTB had higher bactericidal competence of blood. Animals with higher neutrophil counts had higher bactericidal competence, whereas animals with lower lymphocyte counts had higher bactericidal competence. This pattern was driven by animals captured at the end of the dry season (October) and may be evidence of immune polarization, whereby individuals are unable to upregulate multiple components of immunity simultaneously. Bactericidal competence did not vary with host pregnancy status, body condition, age, lactation, tick infestation, nematode egg count, or coccidia oocyst count. Overall, we demonstrate that the bactericidal competence assay is practical and informative for field-based studies in wild bovids. Our results also show a correlation between bactericidal competence and bovine tuberculosis infection and reveal possible functional polarizations between different types of immune response in a free-ranging mammal.

  11. Prevalence and spectrum of helminths in free-ranging African buffaloes (Syncerus caffer in wildlife protected areas, Tanzania

    Directory of Open Access Journals (Sweden)

    Emanuel Senyael Swai

    2013-09-01

    Full Text Available Objective: To determine the prevalence and spectrum of helminths in free-ranging African buffaloes in Tanzania by a cross-sectional study. Methods: Faecal samples (n=1 23 from Arusha National Park and Ngorongoro Crater were examined for helminth eggs using sedimentation and floatation techniques during the period of March to June 2012. Results: Coprological examination revealed that 34.1% (n=42 of the buffaloes excreted nematodes and trematodes eggs and protozoan oocyst in their faces. The pattern of infection was either single or mixed. Single (52.4% and concurrent infections with two, three, four and five parasites were recorded in 19.0%, 11.9%, 14.3% and 2.3% respectively of the cases. The nematode eggs encountered were those of Trichostrongylus sp. (20.3%, Oesophagostomum sp. (7.3%, Strongyle sp. (4.1%, Bunostomum sp. (4.1%, Ostertegia sp. (3.3% and Toxocara sp. (2.4%. The trematode eggs encountered were those of Fasciola sp. (9.8%, Paramphistomum sp. (4.9%, Gastrothylax sp. (1.6%, Ornithobilharzia sp. (0.81% and Fischoederius sp (0.81%. The protozoan oocyst recorded was that of Eimeria sp. (8.1%. Geographical location of buffaloes had significant influence on the prevalence of infection with Trichostrongylus (P=0.046 and Fasciola (P=0.001, and the mean prevalances in Arusha National Park are significantly higher than those in Ngorongoro Crater. Age had significant influence on infection with Fasciola (P=0.036, and juvenile recorded higher levels of infection than sub-adults. Health status, body condition score and sex-wise prevalence of helminths were not significant (P>0.05. Conclusions: This study indicates that helminths species are numerous and highly prevalent in the two protected areas and may be one of the contributing factors to lower buffalo productivity.

  12. Rift Valley fever virus infection in African Buffalo (Syncerus caffer) herds in rural South Africa: Evidence of interepidemic transmission

    Science.gov (United States)

    LaBeaud, A.D.; Cross, P.C.; Getz, W.M.; Glinka, A.; King, C.H.

    2011-01-01

    Rift Valley fever virus (RVFV) is an emerging biodefense pathogen that poses significant threats to human and livestock health. To date, the interepidemic reservoirs of RVFV are not well defined. In a longitudinal survey of infectious diseases among African buffalo during 2000-2006, 550 buffalo were tested for antibodies against RVFV in 820 capture events in 302 georeferenced locations in Kruger National Park, South Africa. Overall, 115 buffalo (21%) were seropositive. Seroprevalence of RVFV was highest (32%) in the first study year, and decreased progressively in subsequent years, but had no detectable impact on survival. Nine (7%) of 126 resampled, initially seronegative animals seroconverted during periods outside any reported regional RVFV outbreaks. Seroconversions for RVFV were detected in significant temporal clusters during 2001-2003 and in 2004. These findings highlight the potential importance of wildlife as reservoirs for RVFV and interepidemic RVFV transmission in perpetuating regional RVFV transmission risk. Copyright ?? 2011 by The American Society of Tropical Medicine and Hygiene.

  13. The life history and fishery potential of Labeo umbratus (Teleostei ...

    African Journals Online (AJOL)

    The life histories of five populations of moggel, Labeo umbratus, inhabiting small Eastern Cape reservoirs were compared and the differences related to environmental parameters. A significant positive correlation between fish growth and chlorophyll a was noted in four cases. In the eutrophic Dimbaza Reservoir, slow ...

  14. Cryopreservation of spermatozoa of black marlin, Makaira indica (Teleostei: Istiophoridae).

    Science.gov (United States)

    van der Straten, K M; Leung, L K-P; Rossini, R; Johnston, S D

    2006-01-01

    As a first step towards the development of a method for the cryopreservation of black marlin spermatozoa, this study investigated the effect of dimethylsulfoxide (DMSO) concentration and pellet size on post-thaw spermatozoal motility. Spermatozoa were recovered from the spermatic duct of testes retrieved post-mortem from four adult black marlin caught in the Coral Sea spawning grounds of Australia. Undiluted spermatozoa were stored on ice for 4 to 10 hours during transport to shore, then evaluated for motility after activation in seawater (1:10 v:v). Spermatozoa were prepared for cryopreservation in pellets by extension (1:3 v:v) in a defined fish Ringer's solution to give two final DMSO concentrations of 2.5% or 5.0%. Diluted spermatozoa were frozen directly on a dry ice block in pellet sizes of either 0.25 ml or 0.50 ml. Frozen pellets were thawed in a water bath at 40 degrees C for 60 seconds and assessed for post-thaw motility following activation in seawater. Spermatozoa recovered within 50 minutes of death and chilled on ice for 4 to 10 hours showed a mean (+/- SEM) motility immediately following activation of 91.6 +/- 7.9%. 50% of the spermatozoa remained motile for approximately 4 to 5 minutes. Following cryopreservation, mean motility declined significantly across all cryoprotectant and pellet size combinations (P < 0.001) but spermatozoa frozen in 2.5% DMSO showed higher motility than those frozen in 5.0% DMSO (P = 0.014). Pellet size had no effect on post-thaw motility (P = 0.179).

  15. (Teleostei: Mormyridae), a mormyrid fish from the Namib desert

    African Journals Online (AJOL)

    We critically compared Marcusenius specimens from the mouth of the Cunene River on the Namibia/Angola border, a harsh desert environment on the Atlantic Ocean coast virtually devoid of aerial insects with ... Keywords: ecology, electric organ discharges, genetic differentiation, morphology, phylogeography, speciation ...

  16. THE BREEDING CYCLE OF MALE LIZA DUMERILI (TELEOSTEI ...

    African Journals Online (AJOL)

    The breeding cycle of male Liza dumerili was studied in the Swartkops Estuary using a visual index, a gonosomatic index and a histological index. Histological studies were superior to any other means of establishing the breeding cycle in detail. Male fISh were in the inactive or non-breeding state during the winter months.

  17. Molecular cytogenetic of the Amoy croaker, Argyrosomus amoyensis (Teleostei, Sciaenidae)

    Science.gov (United States)

    Liao, Mengxiang; Zheng, Jiao; Wang, Zhiyong; Wang, Yilei; Zhang, Jing; Cai, Mingyi

    2017-08-01

    The family Sciaenidae is remarkable for its species richness and economic importance. However, the cytogenetic data available in this fish group are still limited, especially those obtained using fluorescence in situ hybridization (FISH). In the present study, the chromosome characteristics of a sciaenid species, Argyrosomus amoyensis, were examined with several cytogenetic methods, including dual-FISH with 18S and 5S rDNA probes, and a self-genomic in situ hybridization procedure (Self-GISH). The karyotype of A. amoyensis comprised 2n=48 acrocentric chromosomes. A single pair of nucleolar organizer regions (NORs) was located at the proximal position of chromosome 1, which was positive for silver nitrate impregnation (AgNO3) staining and denaturation-propidium iodide (DPI) staining but negative for Giemsa staining and 4',6-diamidino-2-phenylindole (DAPI) staining, and was confirmed by FISH with 18S rDNA probes. The 5S rDNA sites were located at the centromeric region of chromosome 3. Telomeric FISH signals were detected at all chromosome ends with different intensities, but internal telomeric sequences (ITSs) were not found. Self-GISH resulted in strong signals distributed at the centromeric regions of all chromosomes. C-banding revealed not only centromeric heterochromatin, but also heterochromatin that located on NORs, in interstitial and distal telomeric regions of specific chromosomes. These results suggest that the karyotype of Amoy croaker was relatively conserved and primitive. By comparison with the reported cytogenetic data of other sciaenids, it can be deduced that although the karyotypic macrostructure and chromosomal localization of 18S rDNA are conserved, the distribution of 5S rDNA varies dynamically among sciaenid species. Thus, the 5S rDNA sites may have different evolutionary dynamics in relation to other chromosomal regions, and have the potential to be effective cytotaxonomic markers in Sciaenidae.

  18. The complete mitochondrial genome of the Epinephelus polyphekadion (Teleostei, Serranidae).

    Science.gov (United States)

    Zhang, Guoqing; Chen, Mengmeng; Luo, Jian; Chen, Guohua

    2016-07-01

    In this study, the complete mitochondrial genome of the Epinephelus polyphekadion has been sequenced by the next-generation sequencing (NGS) techniques strategy. The mitochondrial genome is 16,691 bp in length and consists of 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and a control region. The nucleotide compositions of the light strand are 27.90% A, 29.05% T, 27.48% G and 15.58% C. With the exception of ND6 and eight tRNA genes, all other mitochondrial genes are encoded on the heavy-strand (H-strand). All the tRNAs have clover secondary structure with conservative anticodon arm, TΨC arm and D arm except for tRNA-Ser(GCT) and tRNA-Pro(TGG), which D arm consists of 13 bp and 7 bp single-base, respectively. Phylogenetic tree showed that E. latifasciatus, E. polyphekadion, E. epistictus, E. akaara and E. stictus of the Epinephelus formed a monophyletic group, whereas E. latifasciatus, E. polyphekadion and E. epistictus formed a sister group.

  19. Karyosystematics of Kol tooth-carp, Aphanius darabensis (Teleostei: Cyprinodontidae

    Directory of Open Access Journals (Sweden)

    Azam Mansoori

    2016-09-01

    Full Text Available The karyological and cytological characteristics of an endemic cyprinodont fish of Iran, Aphanius darabensis Esmaeili, Teimori, Gholami & Reichenbacher, 2014 have been investigated for the first time by examining metaphase chromosomes spreads obtained from gill epithelial and kidney cells. The diploid chromosome number of A. darabensis is 48. The karyotype consisted of five submetacentric and 19 subtelocentric pairs of chromosomes (5sm+19st. The fundamental number (FN is 58. Sex chromosomes were cytologically indistinguishable in this tooth-carp. According to this study and previous karyological reports from other cyprinodont species, it can be suggested that the diploid number (2n=48 is common amongst cyprinodont fishes. These results can be used as basic informations in population studies and management and conservation programs.

  20. Systematics of the neotropical fish subfamily Glandulocaudinae (Teleostei: Characiformes: Characidae

    Directory of Open Access Journals (Sweden)

    Naércio A. Menezes

    Full Text Available The systematics of the Glandulocaudinae is reviewed in detail and justification for the recognition of the group as a subfamily is discussed. The subfamily Glandulocaudinae consists of three genera: Lophiobrycon with one species plesiomorphic in some anatomical features but some others exclusively derived relative to the species in the other genera; Glandulocauda with two species intermediate in phylogenetic derivation; and Mimagoniates with seven species (one new, all more phylogenetically derived concerning their pheromone producing caudal-fin organs and with other anatomical characters presumably more derived than in the species of the other genera. Glandulocauda melanogenys Eigenmann, 1911, is considered a junior synonym of Hyphessobrycon melanopleurus Ellis, 1911. A replacement name, Glandulocauda caerulea Menezes & Weitzman, is proposed for G. melanopleura Eigenmann, 1911. Gland cells found in the caudal-fin organs of all species are histologically indistinguishable from club cells and probably secrete a pheromone during courtship. The club cells are associated with somewhat modified to highly derived caudal scales forming a pheromone pumping organ in the more derived genera and species. This subfamily is distributed in freshwaters of eastern and southern Brazil, Paraguay, and northeastern Uruguay.

  1. Leptolepis, Paraleptolepis (Teleostei and a New Fish Name

    Directory of Open Access Journals (Sweden)

    G. Arratia

    2003-01-01

    Full Text Available A new genus and species, Paraleptolepis wiedenrothi Arratia & Thies, 2001 was recently described from the Lower Jurassic Posidonia shale of northern Germany. Unfortunately, the name Paraleptolepis is currently occupied by a Japanese fish genus of Early Cretaceous age, which is unrelated to the so-called leptolepiforms. A new name, Longileptolepis, is proposed for the German Toarcian genus. Differences between both genera are discussed. Eine neue Gattung und Art, Paraleptolepis wiedenrothi Arratia & Thies. 2001 wurde kürzlich aus den unterjurassischen Posidonienschiefern Norddeutschlands beschrieben. Leider ist der Name Paraleptolelpis für eine japanische Fischgattung frühkretazischen Alters präokkupiert; diese Form ist nicht mit den sogenannten Leptolepiformen verwandt. Ein neuer Name, Longileptolepis, wird für die Gattung aus dem deutschen Toarcium vorgeschlagen. Die Unterschiede zwischen beiden Gattungen werden diskutiert. doi:10.1002/mmng.20030060108

  2. Role of Brycinus lateralis (Teleostei: Alestidae) in dispersal and ...

    African Journals Online (AJOL)

    Seed passage through the gut of vertebrates can be important for seed dispersal, but might influence seed viability. The ability of seeds to germinate after ingestion by seed-eating fish is important for the population dynamics of some plant species, and significant in the evolution of plant–fish interactions. Certain fish in the ...

  3. Horabagrus melanosoma: a junior synonym of Horabagrus brachysoma (Teleostei: Horabagridae).

    Science.gov (United States)

    Ali, Anvar; Katwate, Unmesh; Philip, Siby; Dhaneesh, K V; Bijukumar, A; Raghavan, Rajeev; Dahanukar, Neelesh

    2014-11-06

    Horabagrus melanosoma was described from West Venpala in the lower reaches of the Manimala River, in the state of Kerala, India. It was distinguished from its nearest congener, H. brachysoma based on a combination of characters including darker body colour, shorter pelvic fin and greater number of anal fin rays. Examination of the type material revealed significant morphometric and meristic discrepancies with the original description. Based on multivariate morphometric, and genetic analysis of topotypical specimens, we propose that H. melanosoma should be treated as a junior synonym of H. brachysoma.

  4. Ontogeny and homology of the claustra in otophysan Ostariophysi (Teleostei).

    Science.gov (United States)

    Britz, Ralf; Hoffmann, Matthias

    2006-08-01

    We studied the ontogeny of the claustrum comparatively in representatives of all otophysan subgroups. The claustrum of cypriniforms has a cartilaginous precursor, the claustral cartilage, which subsequently ossifies perichondrally at its anterior face and develops an extensive lamina of membrane bone. The membrane bone component of the claustrum and its close association with the atrium sinus imparis, a perilymphatic space of the Weberian apparatus, are both synapomorphies of cypriniforms. The characiform claustrum is not preformed in cartilage and originates as a membrane bone ossification, a putative synapomorphy of that taxon. Among siluriforms, the claustrum is present only in more basal groups and originates as an elongate cartilage that ossifies in a characteristic ventrodorsal direction, possibly a synapomorphy of catfishes. Gymnotiforms lack the claustral cartilage and claustrum. We review all previous hypothesis of claustrum homology in light of the above findings and conclude that the most plausible hypothesis is the one originally proposed by Bloch ([1900] Jen Z Naturw 34:1-64) that claustra are homologs of the supradorsals of the first vertebra. Copyright 2006 Wiley-Liss, Inc.

  5. The biology of Barbus mattozi Guimaraes (Teleostei, Cyprinidae) in ...

    African Journals Online (AJOL)

    increase from June 1975 and these were most likely the cohort spawned during the good rains of 1973–1974. Fluvial fishes in semi-arid parts of southern. Africa are likely to experience wide variations in numbers determined by the success or failure of spawning in wet or dry years. African Journal of Aquatic Science 2004 ...

  6. Low allozyme variation in tigerfish Hydrocynus vittatus (Teleostei ...

    African Journals Online (AJOL)

    Mean heterozygosity was 1% in the Okavango, as compared to 1.9% in the Upper Zambezi and 5.6% in the Olifants River systems. Possible reasons for this anomaly, in terms of the Hardy-Weinberg principle, include the founder effect caused when the Okavango and Zambezi rivers became separated, and/or that the ...

  7. THE BREEDING CYCLE OF MALE LIZA DUMERILI (TELEOSTEI ...

    African Journals Online (AJOL)

    Active. spermatocytogenesis, meiosis and spermiogenesis All testis lobules filled with cysts of primary and secondary spermato- cytes and spermatids. Sperm content of testis and main sperm duct varying from few sperm present to packed with sperm. Stage 6: Late spermiogenesis. More than 90% of testis filled with sperm.

  8. Plasma Proteins Of Barbus holubi and Clarias Gariepinus (Teleostei ...

    African Journals Online (AJOL)

    The plasma proteins of the teleosts, Barbus holubi and Clarias gariepinus were investigated by means of cellulose-acetate and polyacrylamide gel electrophoresis. Characteristic patterns were obtained with both methods for each species. It was found that the application of human nomenclature to the patterns obtained in ...

  9. Parallel speciation in Astyanax cave fish (Teleostei) in Northern Mexico.

    Science.gov (United States)

    Strecker, Ulrike; Hausdorf, Bernhard; Wilkens, Horst

    2012-01-01

    We investigated differentiation processes in the Neotropical fish Astyanax that represents a model system for examining adaptation to caves, including regressive evolution. In particular, we analyzed microsatellite and mitochondrial data of seven cave and seven surface populations from Mexico to test whether the evolution of the cave fish represents a case of parallel evolution. Our data revealed that Astyanax invaded northern Mexico across the Trans-Mexican Volcanic Belt at least three times and that populations of all three invasions adapted to subterranean habitats. Significant differentiation was found between the cave and surface populations. We did not observe gene flow between the strongly eye and pigment reduced old cave populations (Sabinos, Tinaja, Pachon) and the surface fish, even when syntopically occurring like in Yerbaniz cave. Little gene flow, if any, was found between cave populations, which are variable in eye and pigmentation (Micos, Chica, Caballo Moro caves), and surface fish. This suggests that the variability is due to their more recent origin rather than to hybridization. Finally, admixture of the young Chica cave fish population with nuclear markers from older cave fish demonstrates that gene flow between populations that independently colonized caves occurs. Thus, all criteria of parallel speciation are fulfilled. Moreover, the microsatellite data provide evidence that two co-occurring groups with small sunken eyes and externally visible eyes, respectively, differentiated within the partly lightened Caballo Moro karst window cave and might represent an example for incipient sympatric speciation. Copyright © 2011 Elsevier Inc. All rights reserved.

  10. Movement patterns of Lichia amia (Teleostei: Carangidae): results ...

    African Journals Online (AJOL)

    Understanding fish movement patterns and migrations is important for fisheries management as well as the identification and conservation of critical habitats. Data collected by the Oceanographic Research Institute's Cooperative Fish Tagging Project (ORI-CFTP) were used to describe the large-scale movement patterns of ...

  11. A Time-Calibrated Mitogenome Phylogeny of Catfish (Teleostei: Siluriformes).

    Science.gov (United States)

    Kappas, Ilias; Vittas, Spiros; Pantzartzi, Chrysoula N; Drosopoulou, Elena; Scouras, Zacharias G

    2016-01-01

    A very significant part of the world's freshwater ichthyofauna is represented by ancient, exceptionally diverse and cosmopolitan ray-finned teleosts of the order Siluriformes. Over the years, catfish have been established as an exemplary model for probing historical biogeography at various scales. Yet, several tantalizing gaps still exist in their phylogenetic history, timeline and mode of diversification. Here, we re-examine the phylogeny of catfish by assembling and analyzing almost all publicly available mitogenome data. We constructed an ingroup matrix of 62 full-length mitogenome sequences from 20 catfish families together with four cypriniform outgroups, spanning 15,557 positions in total. Partitioned maximum likelihood analyses and Bayesian relaxed clock dating using fossil age constraints provide some useful and novel insights into the evolutionary history of this group. Loricarioidei are recovered as the first siluriform group to diversify, rendering Neotropics the cradle of the order. The next deepest clade is the South American Diplomystoidei placed as a sister group to all the remaining Siluroidei. The two multifamilial clades of "Big Asia" and "Big Africa" are also recovered, albeit nodal support for the latter is poor. Within "Big Asia", Bagridae are clearly polyphyletic. Other interfamilial relationships, including Clariidae + Heteropneustidae, Doradidae + Auchenipteridae and Ictaluridae + Cranoglanididae are robustly resolved. Our chronogram shows that siluriforms have a Pangaean origin, at least as far back as the Early Cretaceous. The inferred timeline of the basal splits corroborates the "Out-of-South America" hypothesis and accords well with the fossil record. The divergence of Siluroidei most likely postdated the final separation of Africa and South America. An appealing case of phylogenetic affinity elaborated by biogeographic dispersal is exemplified by the Early Paleogene split between the Southeast Asian Cranoglanididae and Ictaluridae, with the latter radiating into North America's freshwater realm by Eocene. The end of Cretaceous probably concludes the major bout of diversification at the family level while with the dawn of the Cenozoic a prolific radiation is evident at the generic level.

  12. Does Serranochromis altus (Teleostei: Cichlidae) exist in the ...

    African Journals Online (AJOL)

    Two possibly synonymous fish species in the Okavango Delta, Botswana, Serranochromis altus and S. angusticeps, were compared. Ecological data, morphometrics, meristics, allozymes, and genomic fingerprints — generated with six Inter-Simple Sequence Repeat (ISSR) analyses, and DNA barcoding primers — were ...

  13. A profile of the introduced Oreochromis niloticus (Pisces: Teleostei ...

    African Journals Online (AJOL)

    STORAGESEVER

    2008-06-03

    Jun 3, 2008 ... 1Department of Fisheries Resources, P.O. Box 4 Entebbe, Uganda. 2Department of Evolution, Ecology and Organismal Biology, 1735 Neil Avenue, Columbus Ohio 43210, U.S.A.. 3Boston University Marine Program, Department of Biology, Boston University 5th Cunninng Street, Massachusetts. U.S.A..

  14. Anaemia in the freshwater catfish Clarias albopunctatus (Teleostei ...

    African Journals Online (AJOL)

    Haematological changes were studied in freshwater catfish Clarias albopunctatus exposed for 20 days to 25%, 50% and 100% concentrations of brewery wastewater prepared by dilution using tap water. Haemoglobin, haematocrit and erythrocyte counts in fish exposed to wastewater were significantly lower than in a ...

  15. Careproctus kidoi, a new Arctic species of snailfish (Teleostei

    DEFF Research Database (Denmark)

    Knudsen, Steen Wilhelm; Møller, Peter Rask

    2008-01-01

    and 1,487 m. It differs from Arctic and North Atlantic congeners in the combination of the characters: pectoral fin rays 21-26, dorsal fin rays 54-60, anal fin rays 50-54, vertebrae 61-64; sucking disc oval, 4.2-6.6% SL; teeth simple; pyloric coeca 3-12; head pore formula (2-6-7-1); color light to dark...

  16. A morphological study on species of African Mormyrus (Teleostei ...

    African Journals Online (AJOL)

    Five species of Mormyrus Linné 1758, three from West Africa and one each from East and southern Africa, were compared morphologically, and their electric organ discharges (EODs) recorded in the field. The five species were morphologically well differentiated in terms of principal components analysis and discriminant ...

  17. The biology of Barnard's dentex, Dentex barnardi (Teleostei: Sparidae)

    African Journals Online (AJOL)

    Barnard's dentexDentex barnardiis a relatively slow-growing, late-maturing species with an intermediate longevity (maximum recorded age = 13 years). The length and age structures of the population were similar for males and females; however, the sex ratio was female biased at 1:1.6. Growth was described by the ...

  18. The biology of the bronze bream, Pachymetopon grande (Teleostei ...

    African Journals Online (AJOL)

    1991-05-02

    May 2, 1991 ... (1981) also states that P. grande attains sexual maturity between 40-45 cm caudal-fork length and breeds during .... Size at sexual maturity was determined by recording the proportion of reproductively active fish (developing, ...... Sex reversal in the sparid fish. Chrysoblephus laticeps. Koedoe 15: 135-139.

  19. Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae

    Directory of Open Access Journals (Sweden)

    José Carlos Pansonato Alves

    Full Text Available Karyotypes of seven fish species of the genus Characidium, three of them studied for the first time, were characterized using conventional cytogenetic techniques (Giemsa staining, Ag-NOR, and C-banding. All species presented a diploid number of 2n=50, with only metacentric and submetacentric chromosomes, as observed in all Characidium species studied. In two species cells with one to three B chromosomes were observed. All species analyzed have a single NOR-bearing chromosome pair with morphological differences among them. Characidium cf. zebra shows heterochromatic blocks restricted to the pericentromeric regions of all chromosomes denoting the absence of a sex chromosome system. On the other hand, the species Characidium lanei, C. pterostictum, C. lauroi, C. oiticicai, C. schubarti, and Characidium sp., besides presenting pericentromeric heterochromatic blocks, exhibited large interstitial and/or terminal heterochromatic blocks, and a ZZ/ZW sex chromosome system. The constitutive heterochromatin seems to play a relevant role in the chromosome differentiation process of the studied species, mainly in relation to the sex chromosomes. The geographical isolation of the rivers in which the species were sampled, associated with their way of life restricted to headwaters environments, may have favored the process of fixation of different karyotypes found in each of the analyzed species.

  20. Quest for the sex chromosomes in Squalius pyrenaicus (Teleostei, Cyprinidae

    Directory of Open Access Journals (Sweden)

    Carla Sofia A. Pereira

    2015-10-01

    Full Text Available In teleosts, evolutionary proximity does not dictate similarity in the sex determining systems. Hybridization, even among closely related species, often results in a huge shock. A good example of such deviation is the cyprinid species complex of Squalius alburnoides with unique characteristics that make this a very interesting model of study regarding the differentiation of sex chromosomes in a hybrid context. This complex endemic to the Iberian Peninsula resulted from the hybridization of Squalius pyrenaicus females (P genome with males from an unknown species closely related to Anaecypris hispanica (A genome. The complex comprises males and females with different levels of ploidy and genome combinations (genomotypes intertwined by altered modes of reproduction, ranging from normal meiosis to meiotic hybridogenesis. Sex ratio in nature is clearly biased towards the prevalence of triploid females but the complex also comprises an allegedly all-male lineage. Overall, sex chromosomes are very similar with X and Z having euchromatic regions while Y and W are completely heterochromatic. The accumulation of heterochromatin and the potential loss of genes on Y and W chromosomes are considered convergent traits in the process of sex chromosome differentiation. Bearing in mind S. pyrenaicus as the maternal lineage of S. alburnoides and the possibility of a ZW sex determining system in this complex, GISH (genomic in situ hybridization experiments were performed in 6 specimens (3 males, 3 females; Cheleiros tributary, Portugal trying to identify polymorphisms that could be associated with differentiating sex chromosomes in S. pyrenaicus. No differences could be found suggesting that either sex determining genes are scattered throughout the genome of this species or that, if present, sex chromosomes remain in a relatively undifferentiated state (morphological and structural. This investigation requires higher resolution cytogenetic tools like repetitive-free chromosome-specific probes, single-copy gene mapping (sex related genes and chromosome-specific anchoring probes/markers.

  1. Recruitment and growth of two small-bodied resident fish species (Gobiidae and Atherinidae) in oligohaline, seasonally open lagoons.

    Science.gov (United States)

    Close, P G; Davies, P M; Trayler, K

    2010-04-01

    Spatio-temporal recruitment patterns, growth and survival of the Swan River goby Pseudogobius olorum and western hardyhead Leptatherina wallacei are described from two small, coastal lagoons on the south coast of Western Australia. In these lagoons, estuarine salinity dynamics were relatively stable over much of the autumn-spring period when freshwater inputs from rivers were reduced and there was no oceanic connection. Preflexion and flexion stages of both fish species contributed strongly to population size structure in downstream reaches, whereas upstream reaches were dominated by postflexion larvae and juvenile stages. Spawning of both species was protracted and largely asynchronous, although the episodic presence of stronger preflexion and flexion cohorts suggested some synchronized spawning had occurred. Comparison with estuarine conditions over this period provided evidence that synchronized spawning may be related to temperature and salinity variations from a combination of freshwater inputs and periods of marine exchange. Uninterrupted growth and the progression of cohorts through to juvenile stages were consistent with the generally stable estuarine conditions. Larval and juvenile stages of both species were also tolerant of abrupt changes in salinity and temperature, which occurred due to a non-seasonal oceanic connection. These findings were consistent with the euryhaline nature of adults of both species.

  2. A new species of Coryogalops (Perciformes: Gobiidae) and the first adult record of Feia nympha from the Red Sea.

    Science.gov (United States)

    Kovačić, Marcelo; Bogorodsky, Sergey V; Mal, Ahmad O

    2016-03-31

    A new species of the gobiid genus Coryogalops, C. nanus sp. nov. is described from the Red Sea. Coryogalops nanus sp. nov. is distinguished from congeners in having dorsal-fin rays VI + I,10; anal-fin rays I,9; pectoral-fin rays 12-14 (lowest count known for the genus), two upper rays with free tips; pelvic fins I,5, joined to form an emarginate disc, no pelvic frenum; predorsal area and narrow area at base of first dorsal fin naked; longitudinal scale series 26-29; transverse scale rows counted forward 6-7; transverse scale rows counted backward 7-8; circumpeduncular scale rows 11-12; seven transverse suborbital rows of sensory papillae; no tentacle above upper eye margin; anterior nostril tubular, without flap at its tip, posterior nostril pore-like; body semitranslucent, covered with small scattered orange-yellow spots and speckles, those in predorsal area contain black dots; an internal row of white spots along ventral part of body above anal-fin base and on caudal peduncle; head with small scattered orange to yellowish brown spots; first dorsal fin with two broad white bands at base of fin and distally, and with hyaline area densely dotted with melanophores in the middle of fin; preserved specimens opaque white to yellowish with sparse melanophores. An adult specimen of Feia nympha is recorded for the first time in the Red Sea and the lateral line system of this species is described.

  3. Two new records of Valenciennea helsdingenii (Perciformes: Gobiidae) and Chromis margaritifer (Perciformes: Pomacentridae) from Jeju Island, Korea

    Science.gov (United States)

    Myoung, Jung-Goo; Myoung, Se Hun; Hwang, In-Seo; Kim, Byung-il; Kim, Jin-Koo

    2014-03-01

    Two specimens of Valenciennea helsdingenii and one specimen of Chromis margaritifer were collected on scuba in October 2011 from Jeju Island, Korea. V. helsdingenii is characterized by a body with two dark stripes that connect the head and caudal fin, and a large dark spot between the third and sixth dorsal fin spines. C. margaritifer is characterized by a body that is dark brown anteriorly but white posteriorly at the boundary between the fifth dorsal fin soft ray and the ninth anal fin soft ray. The Korean name `Bok-gi-mang-duk-sok' is proposed for the genus Valenciennea, the name `Du-jul-bok-gi-mang-duk' is proposed for the species V. helsdingenii, and the name `Huinggo-ri-ja-ri-dom' is proposed for C. margaritifer.

  4. Current status of the mudskipper Periophthalmus modestus (family: Gobiidae) in Hiroshima Prefecture, Seto Inland Sea, Japan

    OpenAIRE

    清水, 則雄; 内藤, 順一; 大塚, 攻; 坂井, 陽一; 橋本, 博明

    2011-01-01

    The Japanese mudskipper, Periophthalmus modestus, is classified as a semi-endangered species on the red list (2007) for estuarine and freshwater fishes published by the Ministry of the Environment. Information on the mudskipper in Hiroshima Prefecture is extremely scarce and it is not published in the red data book (2004) on Hiroshima Prefecture. To determine the current habitat of P. modestus, we surveyed 9 mudflat areas (including areas where the mudskipper had lived in the past) in Hiroshi...

  5. Cryptic species of Ponto-Caspian bighead goby of the genus Ponticola (Gobiidae)

    DEFF Research Database (Denmark)

    Vasil'eva, E. D.; Schwarzhans, Werner; Medvedev, D. A.

    2016-01-01

    Based on karyological data, the validity of the species Ponticola iljini is re-established; its distribution is limited to the coast of the Mangyshlak Peninsula. The morphological characteristics and the basic color pattern of P. iljini are very similar to P. kessleri from the Black Sea basin and P...

  6. Diet composition and feeding ecology of the naked goby Gobiosoma bosc (Gobiidae) from four western Atlantic estuaries.

    Science.gov (United States)

    D'Aguillo, M C; Harold, A S; Darden, T L

    2014-08-01

    The feeding ecology of the small-bodied benthic naked goby Gobiosoma bosc, a western Atlantic species that occurs in estuaries and other inshore habitats from Connecticut to Texas U.S.A., was investigated in a total of four estuaries spanning South Carolina, North Carolina, Maryland and New Jersey. Gut content analysis of 391 individuals revealed that G. bosc is a benthic microcarnivore that feeds primarily on polychaetes, gammarid amphipods and harpacticoid copepods. Diet composition varied with body size, tidal creek within an estuary and geographic region. Analyses of gut fullness suggest that G. bosc is a daytime visual predator and that nest and egg guarding during the reproductive season reduce foraging activity in mature males. Additionally, G. bosc infected with adult digenean parasites of the gut foraged more intensely than uninfected individuals, a relationship that was strongest for reproductively mature males. Regionally, significant variation in dietary breadth was documented and may reflect a foraging response to a decrease in prey diversity moving from estuaries of higher salinity and lower latitude to estuaries of lower salinity and higher latitude. These results contribute to an understanding of the life history of G. bosc and the role played by this common species in estuarine food webs. © 2014 The Fisheries Society of the British Isles.

  7. Behaviour and orcadian rhythm of the fish bathygobius soporator Valenciennes (Gobiidae under the influence of environmental salinity and temperature

    Directory of Open Access Journals (Sweden)

    Edith Fanta

    1997-01-01

    Full Text Available The behavioural patterns and their cireadian rhythms may be adaptive to the peculiar environmental conditions of subtropical brackish waters where Ba-thygobius soporator Valenciennes, 1837 live. Adult fish were caught at the southern Brazilian coast from mangrove rivers and rocky shores in a bay, where temperature and water salinity vary during the day and through the year. Observation on the behaviour of the animals was undertaken in salinity 8.5ppt, 17.0ppt, 25.5ppt and 34.0ppt, each one in temperatures of 18ºC and 28ºC. Temperature and salinity affect the frequency and intensity of some of the behavioural events, more than its pattern or rhythm. Swimming is rare, decreasing along the day and with temperature increase, being even lower at low salinity; aggressiveness is the highest in the morning being not affected by temperature, but by salinity, being higher the higher it is; territory defence decreases along the day and is lower at high temperature and extreme salinities; fish hide more at high temperature and with the decrease of salinity, but this is not rhythmical; a higher proportion of fish rest in vertical position when salinity and temperature are high, increasing slightly at the beginning of the afternoon; respiratory frequency increases with temperature, salinity and in the afternoon; the colour of the fish is mainly light with spots in all hours of the day and in all temperatures and different levels of salinity, but with a tendency of the presence of some dark fish during the morning and some light ones in the afternoon, showing a higher variability of colours at low temperature and extreme salinities. Besides temperature, salinity and light, feeding seems to be one of the determinant factors for the performance of the typical behaviour of B. soporator.

  8. Prevalence and distribution of non-tuberculous mycobacteria (NTM) in cattle, African buffaloes (Syncerus caffer) and their environments in South Africa.

    Science.gov (United States)

    Gcebe, N; Rutten, V; Gey van Pittius, N C; Michel, A

    2013-11-01

    It has been hypothesized that a variety of non-tuberculous mycobacteria (NTM) species to which livestock and wildlife species are naturally exposed induce broadly cross-reactive anti-mycobacterial immune responses which interfere with current standard diagnostic assays. Non-tuberculous mycobacteria have also been implicated in Mycobacterium bovis-specific immune responsiveness, hence potentially the development of tuberculosis. Cattle and African buffaloes are both maintenance hosts of bovine tuberculosis (BTB) in South Africa, yet the effective diagnosis and control in these species may be hampered by adverse effects of NTM. As part of an investigation of the role of NTM in the immune responsiveness of cattle and African buffaloes to NTM, we conducted a countrywide survey to establish the prevalent NTM species and their distribution in the natural environments of these animals. A total of 1123 samples (water, soil, nasal and pharyngeal swabs) were collected for mycobacterium isolation. In addition, NTM isolated from tissue samples between 1991 and 2011 were included in the analysis. Mycobacteria were isolated from 56% of the samples from the countrywide survey. A total of 420 NTM isolates from soil, water, animal tissues and animal-derived swab samples were genotyped with the following results: 302 belonged to 40 known NTM species, 79 were found to be closely related to 23 known NTM species, and 38 isolates were found to be potentially novel species that are not currently listed in the RIDOM and NCBI BLAST databases. The four NTM species or closely related groups most frequently isolated in this survey included Mycobacterium terrae (11.2% of isolates), a group of mycobacteria closely related to Mycobacterium moriokaense (referred to as M. moriokaense-like) (8.1% of isolates), Mycobacterium nonchromogenicum (7.4% of isolates) and Mycobacterium vaccae/M. vanbaalenii (5.2% of isolates). The phylogenetic analysis of the M. moriokaense-like isolates, based on the 16S rRNA sequences, revealed at least eight clusters, possibly associated with eight different NTM species. Our findings provide account of NTM species diversity and associated prevalences in cattle and African buffaloes and their environments in South Africa. The identification of the most prevalent NTM species in this study will allow for a targeted investigation of their effects on host immune responses. © 2013 Blackwell Verlag GmbH.

  9. Characterisation of recent foot-and-mouth disease viruses from African buffalo ( Syncerus caffer )and cattle in Kenya is consistent with independent virus populations

    DEFF Research Database (Denmark)

    Nabalayo Wekesa, Sabenzia; Kiprotich Sangula, Abraham; Belsham, Graham

    2015-01-01

    samples collected from buffalo in three different Kenyan ecosystems; Maasai-Mara (MME) (n = 40), Tsavo (TSE) (n = 33), and Meru (ME) (n = 29). Results Antibodies against FMDV non-structural proteins were found in 65 of 102 (64%) sera from buffalo with 44/102 and 53/102 also having neutralising antibodies...

  10. Feeding niches of four large herbivores in the Hluhluwe Game ...

    African Journals Online (AJOL)

    ... communities; connochaetes taurinus taurinus; discriminant function analysis; equus burchelli burchelli; feeding; grass; grasses; habitat; herbivores; hluhluwe game reserve; kwazulu-natal; large herbivores; latent roots; natal; niche; niche overlap; niche separation; south africa; syncerus caffer caffer; white rhinoceros; ...

  11. Reproductive apparatus and gametogenesis of Lophiosilurus alexandri Steindachner (Pisces, Teleostei, Siluriformes Aparelho reprodutor e gametogênese de Lophiosilurus alexandri Steindachner (Pisces, Teleostei, Siluriformes

    Directory of Open Access Journals (Sweden)

    Marcelo D. M. Barros

    2007-03-01

    Full Text Available The gonad morphology and gametogenesis of Lophiosilurus alexandri Steindachner, 1877 from Santo Antônio river (Minas Gerais, Brazil were studied through anatomical and histological techniques. Examination of the testis revealed that they were paired, fringed organs with two distinct regions: cranial spermatogenic and caudal spermatogenic and secretory. The cranial region represents ca. 60% of the mature/maturing testis, containing 41 to 73 fringes, while the caudal portion represents ca. 40% and contains 44 to 68 fringes. At the cranial portion the length of the fringes was 3.70 ± 1.70 mm and in the caudal portion was 0.20 ± 0.10 mm. The spermatogenesis was cystic, synchronic, and occurred throughout the whole extension of the seminiferous tubules. The ovaries were saculiforms, paired organs, which present ovigerous lamellae containing cells of the oogenic lineage. The oocytes were classified into four developmental stages according to their cytological characteristics and the characteristics of the cell layers that surround them.A morfologia das gônadas e a gametogênese de Lophiosilurus alexandri Steindachner, 1877 do rio Santo Antônio, bacia do rio Doce, Minas Gerais, foram estudadas através de técnicas anatômicas e histológicas. Os testículos são órgãos pares, franjados e apresentam regiões cranial espermatogênica e caudal espermatogênica e secretora. A região cranial corresponde aproximadamente a 60% do comprimento do testículo em maturação/maduro e contém de 41 a 73 franjas e a região caudal representa 40% e possui de 44 a 68 franjas. Na região cranial o comprimento das franjas é 3,70 ± 1,70 mm e na região caudal 0,20 ± 0,10 mm. A espermatogênese ocorre de forma sincrônica, em cistos, e em toda a extensão da parede dos túbulos seminíferos. Os ovários são órgãos pares, saculiformes e, histologicamente, apresentam lamelas ovígeras que contém as células da linhagem ovogênica. Os ovócitos foram classificados em quatro fases de desenvolvimento, com base em suas características histológicas e das camadas que os circundam.

  12. Revisión taxonómica y geográfica de Bryconamericus peruanus (Teleostei, Characidae Taxonomic and geographic revision of Bryconamericus peruanus (Teleostei, Characidae

    Directory of Open Access Journals (Sweden)

    César Román-Valencia

    2011-09-01

    Full Text Available Se efectúa un análisis taxonómico y geográfico de Bryconamericus peruanus y se compara con las especies de este género presentes en las vertientes del Pacífico sur en Colombia, Ecuador y Perú. Bryconamericus peruanus restringe su distribución al sistema hidrográfico del Pacífico en Perú y se plantea que algunas formas del Pacífico y Amazonas de Ecuador son especies por describir. Los caracteres asociados al dimorfismo sexual, como ganchos en todas las aletas con radios excepto la aleta caudal, son útiles en la diferenciación de B. peruanus y Bryconamericus sp.1 con respecto a B. brevirostris, B. dahli, B. guaytarae, B. miraensis, Bryconamericus sp. 2 y Bryconamericus sp. 3. De acuerdo con la forma (de la mandíbula superior, longitud aleta dorsal-hipurales y longitud pedúnculo caudal, el análisis de componentes principales distingue 2 grupos de especies: I B. peruanus, B. brevirostris, B. guaytarae, B. miraensis y Bryconamericus sp. 3 y II B. dahli, Bryconamericus sp. 1 y Bryconamericus sp. 2.Axonomic and geographic status of Bryconamericus peruanus were analyzed and compared with species belonging to the genus Bryconamericus that occurs in the Pacific basin from Colombia, Ecuador and Peru. Distribution range of B. peruanus is restricted to Peruvian drainages and the populations from the Pacific basin and those located at the Amazons in Ecuador are regarded new species. The presence of hooks on all the fins, except on the caudal fin, was the most reliable character to separate populations of B. peruanus and Bryconamericus sp.1 from B. brevirostris, B. dahli, B. guaytarae, B. miraensis, Bryconamericus sp. 2 and Bryconamericus sp. 3. According to the form upper jaw, dorsal fin-hypurals distance and caudal peduncle length from the principal component analysis, 2 groups are distinguished: I B. peruanus, B. brevirostris, B.guaytarae, B. miraensis y Bryconamericus sp. 3, and II B. dahli, Bryconamericus sp. 1 and Bryconamericus sp. 2.

  13. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae = Dusky grouper Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae gastrintestinal anatomy and histology.

    Directory of Open Access Journals (Sweden)

    José Roberto Machado Cunha da Silva

    2010-10-01

    Full Text Available A garoupa-verdadeira (Epinephelus marginatus é uma espécie de serranídeo com grande importância ecológica e boas perspectivas para o cultivo. A investigação da morfologia do trato digestório, associada à atividade alimentar, é fundamental para a compreensão da biologia dessa espécie e premissa básica para pesquisas sobrerequerimentos nutricionais, desenvolvimento de rações e práticas adequadas de manejo alimentar. O presente trabalho descreve a anatomia e, por meio da microscopia de luz, as variações histológicas ao longo do tubo digestório de juvenis de Epinephelus marginatus, correlacionando a histologia de cada seguimento com as respectivas funções e o hábito alimentar. Verificou-se que essa espécie possui elevado número de tipos celulares ao longo do tubo digestório que estão intimamente relacionados com a resposta imunológica inata e adaptativa, permitindo o hábito alimentar detritívoro.

  14. Revisión taxonómica y geográfica de Bryconamericus peruanus (Teleostei, Characidae) Taxonomic and geographic revision of Bryconamericus peruanus (Teleostei, Characidae)

    OpenAIRE

    César Román-Valencia; María Dolly García; Hernán Ortega

    2011-01-01

    Se efectúa un análisis taxonómico y geográfico de Bryconamericus peruanus y se compara con las especies de este género presentes en las vertientes del Pacífico sur en Colombia, Ecuador y Perú. Bryconamericus peruanus restringe su distribución al sistema hidrográfico del Pacífico en Perú y se plantea que algunas formas del Pacífico y Amazonas de Ecuador son especies por describir. Los caracteres asociados al dimorfismo sexual, como ganchos en todas las aletas con radios excepto la aleta caudal...

  15. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834) (Teleostei, Serranidae) = Dusky grouper Epinephelus marginatus (Lowe, 1834) (Teleostei, Serranidae) gastrintestinal anatomy and histology.

    OpenAIRE

    José Roberto Machado Cunha da Silva; Eduardo Gomes Sanches; Marcos Silva de Oliveira; João Carlos Shimada Borges

    2010-01-01

    A garoupa-verdadeira (Epinephelus marginatus) é uma espécie de serranídeo com grande importância ecológica e boas perspectivas para o cultivo. A investigação da morfologia do trato digestório, associada à atividade alimentar, é fundamental para a compreensão da biologia dessa espécie e premissa básica para pesquisas sobrerequerimentos nutricionais, desenvolvimento de rações e práticas adequadas de manejo alimentar. O presente trabalho descreve a anatomia e, por meio da microscopia de luz, as ...

  16. Karyotype divergence and spreading of 5S rDNA sequences between genomes of two species: darter and emerald gobies ( Ctenogobius , Gobiidae).

    Science.gov (United States)

    Lima-Filho, P A; Bertollo, L A C; Cioffi, M B; Costa, G W W F; Molina, W F

    2014-01-01

    Karyotype analyses of the cryptobenthic marine species Ctenogobius boleosoma and C. smaragdus were performed by means of classical and molecular cytogenetics, including physical mapping of the multigene 18S and 5S rDNA families. C. boleosoma has 2n = 44 chromosomes (2 submetacentrics + 42 acrocentrics; FN = 46) with a single chromosome pair each carrying 18S and 5S ribosomal sites; whereas C. smaragdus has 2n = 48 chromosomes (2 submetacentrics + 46 acrocentrics; FN = 50), also with a single pair bearing 18S rDNA, but an extensive increase in the number of GC-rich 5S rDNA sites in 21 chromosome pairs. The highly divergent karyotypes among Ctenogobius species contrast with observations in several other marine fish groups, demonstrating an accelerated rate of chromosomal evolution mediated by both chromosomal rearrangements and the extensive dispersion of 5S rDNA sequences in the genome. © 2014 S. Karger AG, Basel.

  17. Description of a new species of Priolepis (Perciformes: Gobiidae) from the Red Sea, a new record of Priolepis compita, and a distributional range extension of Trimma fishelsoni.

    Science.gov (United States)

    Bogorodsky, Sergey V; Suzuki, Toshiyuki; Mal, Ahmad O

    2016-08-11

    A new species of Reefgoby, Priolepis melanops, is described from Al Lith, central Saudi Arabian coast of the Red Sea, on the basis of a single adult specimen. It is a distinctive species, and can distinguish from its congeners by the following characters: dorsal-fin rays VI + I,9, no elongate spines in first dorsal fin; anal-fin rays I,8; pectoral-fin rays 14-15, all unbranched; longitudinal scale series 25; no scales on the head or predorsal midline, sides of the nape scaled; a developed transverse pattern of the sensory papillae below the eye; fifth pelvic-fin ray unbranched, its length 47% length of fourth ray; body and most of head brownish orange, densely covered with melanophores; snout, lips, chin and chest black; iris black; fins translucent with narrow black stripe along base of each dorsal fin. Placement of the new species in Priolepis is based on the presence of characteristics currently associated with Priolepis rather than with Trimma. An individual of Priolepis compita Winterbottom was photographed in very shallow water on a reef flat at Sharm el Sheikh, at the entrance of the Gulf of Aqaba, and represents a new record for the Red Sea. The endemic Red Sea species Trimma filamentosus Winterbottom and T. fishelsoni Goren, previously know as far south as Jeddah, were collected at Al Lith, central Saudi Arabia, and represents the southernmost record for both species. Variation of P. compita and T. fishelsoni is noted and the cephalic sensory system of the latter is described for the first time. In addition, we report that records of Trimma tevegae Cohen & Davis from the Red Sea are based on misidentification. A key to distinguish the species of Priolepis and Trimma known from the Red Sea is provided.

  18. DNA barcoding of Gobiid fishes (Perciformes: Gobiidae) from eastern and northeastern India with new record of a Gobionellinae species for the region.

    Science.gov (United States)

    Laskar, Boni Amin; Kumar, Vikas; Kundu, Shantanu; Tyagi, Kaomud; Singha, Devkant; Chakraborty, Rajasree; Chatterjee, Sumantika; Saha, Soumitra

    2017-07-01

    The study attempted identification of Gobiid fishes from freshwaters in the east and northeast India on a collection of 20 specimens. The DNA barcode data delineated the collected samples into three species clades in the neighbor-joining tree. The results confirmed the identification of five sample sequences belonging to the subfamily Gobionellinae due to cohesive cladding with Awaous congeners. This is a new subfamily record for the northeastern region. Another 15 sample sequences showed conspecific cladding with Glossogobius giuris in the database. Among the 15 sample sequences, 14 sequences cladded with G. giuris sequences of Indian specimens while one sample sequence cladded with G. giuris sequences of South African specimens. This indicated the presence of either a hidden species or a previously synonymized species in the G. giuris complex.

  19. Application of otolith shape analysis for stock discrimination and species identification of five goby species (Perciformes: Gobiidae) in the northern Chinese coastal waters

    Science.gov (United States)

    Yu, Xin; Cao, Liang; Liu, Jinhu; Zhao, Bo; Shan, Xiujuan; Dou, Shuozeng

    2014-09-01

    We tested the use of otolith shape analysis to discriminate between species and stocks of five goby species ( Ctenotrypauchen chinensis, Odontamblyopus lacepedii, Amblychaeturichthys hexanema, Chaeturichthys stigmatias, and Acanthogobius hasta) found in northern Chinese coastal waters. The five species were well differentiated with high overall classification success using shape indices (83.7%), elliptic Fourier coefficients (98.6%), or the combination of both methods (94.9%). However, shape analysis alone was only moderately successful at discriminating among the four stocks (Liaodong Bay, LD; Bohai Bay, BH; Huanghe (Yellow) River estuary HRE, and Jiaozhou Bay, JZ stocks) of A. hasta (50%-54%) and C. stigmatias (65.7%-75.8%). For these two species, shape analysis was moderately successful at discriminating the HRE or JZ stocks from other stocks, but failed to effectively identify the LD and BH stocks. A large number of otoliths were misclassified between the HRE and JZ stocks, which are geographically well separated. The classification success for stock discrimination was higher using elliptic Fourier coefficients alone (70.2%) or in combination with shape indices (75.8%) than using only shape indices (65.7%) in C. stigmatias whereas there was little difference among the three methods for A. hasta. Our results supported the common belief that otolith shape analysis is generally more effective for interspecific identification than intraspecific discrimination. Moreover, compared with shape indices analysis, Fourier analysis improves classification success during inter- and intra-species discrimination by otolith shape analysis, although this did not necessarily always occur in all fish species.

  20. Changes in the Ratio of the Sulcus Acusticus Area to the Sagitta Area of Pomatoschistus-Minutus and P-Lozanoi (Pisces, Gobiidae)

    NARCIS (Netherlands)

    Arellano, R.V.; Hamerlynck, O.; Vincx, M.; Mees, J.; Hostens, K.; Gijselinck, W.

    1995-01-01

    The Pomatoschistus minutus (Pallas) and P. lozanoi (de Buen) stock of the ebb-tidal delta of the former Grevelingen estuary was sampled monthly from September 1992 to October 1993. Sagittae were extracted and the areas of the sagitta and sulcus acusticus were measured with a digitizer. The frequency

  1. Molecular Phylogeny and Zoogeography of the Capoeta damascina Species Complex (Pisces: Teleostei: Cyprinidae.

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    Nisreen Alwan

    Full Text Available Capoeta damascina was earlier considered by many authors as one of the most common freshwater fish species found throughout the Levant, Mesopotamia, Turkey, and Iran. However, owing to a high variation in morphological characters among and within its various populations, 17 nominal species were described, several of which were regarded as valid by subsequent revising authors. Capoeta damascina proved to be a complex of closely related species, which had been poorly studied. The current study aims at defining C. damascina and the C. damascina species complex. It investigates phylogenetic relationships among the various members of the C. damascina complex, based on mitochondrial and nuclear DNA sequences. Phylogenetic relationships were projected against paleogeographical events to interpret the geographic distribution of the taxa under consideration in relation to the area's geological history. Samples were obtained from throughout the geographic range and were subjected to genetic analyses, using two molecular markers targeting the mitochondrial cytochrome oxidase I (n = 103 and the two adjacent divergence regions (D1-D2 of the nuclear 28S rRNA genes (n = 65. Six closely related species were recognized within the C. damascina complex, constituting two main lineages: A western lineage represented by C. caelestis, C. damascina, and C. umbla and an eastern lineage represented by C. buhsei, C. coadi, and C. saadii. The results indicate that speciation of these taxa is rather a recent event. Dispersal occurred during the Pleistocene, resulting in present-day distribution patterns. A coherent picture of the phylogenetic relationships and evolutionary history of the C. damascina species complex is drawn, explaining the current patterns of distribution as a result of paleogeographic events and ecological adaptations.

  2. Diet of Lipophrys pholis (L.) (Teleostei, Blenniidae) in Cantabrian coastal waters (Spain)

    Science.gov (United States)

    Mazé, Raquel A.; Domínguez, Josefa; Pérez-Cardenal, David

    1999-07-01

    Between February and December 1988, a total of 261 specimens of Lipophrys pholis were caught in eleven intertidal pools on the western coast of Asturias. This blenniid species mainly feeds on different groups of invertebrates, although algal remains also appear. Mollusca is the most highly represented taxon with the largest number of prey being Gastropoda, followed by Bivalvia and, to a lesser degree, Polyplacophora. Crustacea is well represented by Cirripedia. Isopoda also stands out and Amphipoda, Tanaidacea and Decapoda appear sporadically. Temporal diet analysis throughout the year shows no great differences. Likewise, a great similarity was observed among the feeding of L. pholis specimens collected in pools at a different tidal level, of variable size and with different algal cover. Changes in diet are appreciable as size increases, especially from a length of 6 cm on.

  3. New insights on early evolution of spiny-rayed fishes (Teleostei: Acanthomorpha

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    Wei-Jen eChen

    2014-10-01

    Full Text Available The Acanthomorpha is the largest group of teleost fishes with about one third of extant vertebrate species. In the course of its evolution this lineage experienced several episodes of radiation, leading to a large number of descendant lineages differing profoundly in morphology, ecology, distribution and behavior. Although Acanthomorpha was recognized decades ago, we are only now beginning to decipher its large-scale, time-calibrated phylogeny, a prerequisite to test various evolutionary hypotheses explaining the tremendous diversity of this group. In this study, we provide new insights into the early evolution of the acanthomorphs and the euteleost allies based on the phylogenetic analysis of a newly developed dataset combining nine nuclear and mitochondrial gene markers. Our inferred tree is time-calibrated using 15 fossils, some of which have not been used before. While our phylogeny strongly supports a monophyletic Neoteleostei, Ctenosquamata (i.e., Acanthomorpha plus Myctophiformes, and Acanthopterygii, we find weak support (bootstrap value < 48% for the traditionally defined Acanthomorpha, as well as evidence of non-monophyly for the traditional Paracanthopterygii, Beryciformes, and Percomorpha. We corroborate the new Paracanthopterygii sensu Miya et al. (2005 including Polymixiiformes, Zeiformes, Gadiformes, Percopsiformes, and likely the enigmatic Stylephorus chordatus. Our timetree largely agrees with other recent studies based on nuclear loci in inferring an Early Cretaceous origin for the acanthomorphs followed by a Late Cretaceous/Early Paleogene radiation of major lineages. This is in contrast to mitogenomic studies mostly inferring Jurassic or even Triassic ages for the origin of the acanthomorphs. We compare our results to those of previous studies, and attempt to address some of the issues that may have led to incongruence between the fossil record and the molecular clock studies, as well as between the different molecular timetrees.

  4. Nematode larvae infecting Priacanthus arenatus Cuvier, 1829 (Pisces: Teleostei in Brazil

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    BIANCA P. KURAIEM

    2016-06-01

    Full Text Available From July to December, 2013, thirty Priacanthus arenatus specimens commercialized in the cities of Niterói and Rio de Janeiro, State of Rio de Janeiro, were acquired. The fish were necropsied and filleted to investigate the presence of nematode larvae. Twenty fish (66.7% out of the total were parasitized by nematode larvae. A total of 2024 larvae were collected; among them, 30 third-instar larvae of Anisakis sp. showed prevalence (P = 20%, mean abundance (MA = 1, and the mean intensity (MI = 5, and infection sites (IS = caecum, stomach, liver, and mesentery; and 1,994 third-instar larvae (1,757 encysted and 237 free of Hysterothylacium deardorffoverstreetorum with P = 66.7%, MA = 66.5, and MI = 99.7, and IS = spleen, caecum, stomach, liver, mesentery, and abdominal muscle. This is the first study to report H. deardorffoverstreetorum and Anisakis sp. larvae parasitizing P. arenatus.

  5. Two new species of Oxynoemacheilus from the Tigris drainage in Iraqi Kurdistan (Teleostei: Nemacheilidae).

    Science.gov (United States)

    Freyhof, Jörg; Abdullah, Younis Sabir

    2017-03-02

    Two new species of Oxynoemacheilus are described from the Sirvan River drainage in Iraqi Kurdistan. Oxynoemacheilus gyndes, new species, is distinguished by having a very short lateral line, reaching behind the pectoral-fin base, no scales except on the posteriormost part of the caudal peduncle, a slightly emarginate caudal fin and no suborbital groove in males. Oxynoemacheilus hanae, new species, is distinguished by having a midlateral row of elongated blotches, isolated patches of dark-brown spots or blotches on lower flank, a deeply emarginate caudal fin and a suborbital groove in males.

  6. Diet of Astyanax species (Teleostei, Characidae in an Atlantic Forest River in Southern Brazil

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    Fábio Silveira Vilella

    2002-06-01

    Full Text Available Feeding habits of six species of Astyanax from river Maquiné are described. Fishes were sampled bi-monthly from November/95 to September/96 in two zones of the river. Items were identified, counted and had their abundance estimated according to a semi-quantitative scale. Frequency of occurrence, alimentary importance index (IFI values and a similarity analysis of diets for each species-river zone sample were examined. All the species were considered typically omnivorous, with insects and vegetal matter being the most important items in their diet. These species could act as seed dispersers, particularly for macrophytes. Intra-specific spatial differences were not observed in comparisons of samples from two diferent regions of the river, except for A. fasciatus. The presence of Podostemaceae macrophytes in the mid-course of the river seemed to be important both as an autochthonous food resource and as habitat for several organisms preyed by the Astyanax species.Seis espécies do gênero Astyanax, presentes no rio Maquiné, RS, foram estudadas quanto aos seus hábitos alimentares. Os exemplares foram amostrados bimensalmente de novembro de 1995 a setembro de 1996 nas zonas ritral e potamal do rio. Os itens alimentares foram identificados e quantificados de acordo com uma escala semi-quantitativa de abundância, utilizando-se para análise a frequência de ocorrência e um índice de importância alimentar para cada espécie e zona do rio. Análises multivariadas de agrupamento e ordenação foram utilizadas para comparar as dietas intra e interespecíficas. Todas as espécies foram consideradas onivoras, sendo que os itens mais importantes foram os insetos e restos de vegetais superiores. Sugere-se que as espécies estudadas possam atuar como dispersoras de sementes, particularmente para macrófitas. Diferenças espaciais intraespecíficas não foram encontradas, exceto para A. fasciatus. A presença de Podostemaceae no curso médio do rio parece ser uma fonte importante de alimento para as espécies, além de servir de refúgio para diversos organismos que são predados por Astyanax sp.

  7. Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Siluriformes

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    Américo Moraes Neto

    Full Text Available Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs and the chromosomal location of ribosomal genes by fluorescent in situ hybridization (FISH, with 18S and 5S probes, showing only one chromosome pair marked bearer of ribosomal genes, the only exception was Pimelodus britskii that presented multiple NORs and syntenic location of the 18S and 5S probes. Non-Robertsonian events, as pericentric inversion and NORs duplication are requested to explain the karyotype diversification in Pseudoplatystoma from the rio Paraguay (MS, Pimelodus from the rio Iguaçu (PR, Sorubim from the rio Paraguay (MS and Steindachneridion from the rio Paraíba do Sul (SP. The obtained data for the karyotype macrostructure of these species corroborates a conserved pattern observed in Pimelodidae. On the other hand, interspecific variations detected by molecular cytogenetics markers made possible cytotaxonomic inferences and differentiation of the species here analyzed.

  8. Preliminary results of morhological varability of the genus (teleostei, cyprinidae) in Tunisia freshwaters

    OpenAIRE

    Dkhil-Abbes, T.; Kraeim, M.M.

    2008-01-01

    L’analyse de la variabilité bioécologique des populations de poissons du genre Pseudophoxinus a été réalisée par deux méthodes statistiques. La première univariée basée sur les tests de Fisher et de Duncan et a permis de distinguer l’espèce Pseudophoxinus punicus qui s’individualise par des valeurs très élevées de nombre de branchiospines au premier arc branchial gauche et d’écailles à la ligne latérale par rapport aux autres formant un groupe biologiquement homogène. La deuxième méthode, mu...

  9. Feeding ecology of Lutjanus analis (Teleostei: Lutjanidae from Abrolhos Bank, Eastern Brazil

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    Matheus Oliveira Freitas

    2011-06-01

    Full Text Available Diet and feeding ecology of the mutton snapper Lutjanus analis were investigated in the Abrolhos Bank, Eastern Brazil, the largest and richest coral reefs in the South Atlantic, where about 270 species of reef and shore fishes occur. To evaluate seasonal and ontogenetic shifts in the diet, specimens of L. analis were obtained through a fish monitoring program in four cities in southern Bahia State, from June 2005 to March 2007. Stomachs from 85 mutton snappers that ranged in size from 18.1 to 74.0 cm TL were examined. Prey were identified to the lowest possible taxon and assessed by the frequency of occurrence and volumetric methods. Variations in volume prey consumption were evaluated using non-metric multi-dimensional scaling ordination, analysis of similarity, and similarity percentage methods. Significant differences in diet composition among size classes were registered, whereas non significant differences between seasons were observed. Considering size-classes, food items consumption showed important variations: juveniles (50.1 cm TL consumed basically fish, mostly Anguiliformes. Lutjanus analis is an important generalist reef predator, with a broad array of food resources and ontogenetic changes in the diet. This snapper species plays an important role on the trophic ecology of the Abrolhos Bank coral reefs.Foram avaliadas a dieta e a ecologia alimentar da cioba Lutjanus analis no Banco dos Abrolhos, Leste do Brasil. O Banco dos Abrolhos abrange os maiores e mais diversos recifes de corais do Atlântico Sul, onde cerca de 270 espécies de peixes recifais e costeiros ocorrem. Para a avaliação das variações sazonais e ontogênicas na dieta, exemplares de L. analis foram obtidos através de um programa de monitoramento em quatro cidades do extremo sul da Bahia, entre junho de 2005 e março de 2007. Estômagos de 85 exemplares com comprimento total variando entre 18,1 e 74,0 cm foram examinados. Os itens alimentares foram identificados até o menor nível taxonômico possível e avaliados através dos métodos de frequência de ocorrência e volumétrico. Variações no consumo das presas foram avaliadas através do método de escalonamento multidimensional não-métrico e métodos de análise de similaridade e percentagem de similaridade. Diferenças significativas na dieta foram observadas entre as classes de tamanho, porém estas não foram detectadas entre as estações do ano. Considerando as classes de tamanho, os itens consumidos apresentaram importantes variações: os juvenis (50,1 cm CT consumiram basicamente peixes, principalmente Anguiliformes. Lutjanus analis é um importante predador recifal generalista, que consome um amplo espectro de presas, apresentando mudanças ontogênicas na dieta. Esse lutjanídeo desempenha um importante papel na ecologia trófica dos recifes de corais do Banco dos Abrolhos.

  10. Corrigendum: Redescription of Nemachilichthys rueppelli, a senior synonym of N. shimogensis (Teleostei: Nemacheilidae).

    Science.gov (United States)

    Keskar, Ashwini; Kumkar, Pradeep; Katwate, Unmesh; Ali, Anvar; Raghavan, Rajeev; Dahanukar, Neelesh

    2016-05-12

    In Keskar et al. (2015) we emended the original name Cobitis rupelli Sykes, 1839, because Sykes (1839) specifically mentions that the species was named after Rüppell. The specific epithet 'rupelli', with a single 'p', is an incorrect original spelling and should be emended into 'ruppelli' as required by Article 32.5 (International Commission on Zoological Nomenclature, 1999). However, citing Art 32.5.2.1, we also suggested that because Sykes (1839) named the species after Rüppell, the umlaut 'ü' should be corrected to 'ue' and that the specific epithet should thus be 'rueppelli'. This is an error. Sykes (1839) did not use 'ü' in the original spelling of the species epithet rupelli: hence changing it to 'ue' is incorrect. Therefore, the correct spelling for the species should be 'Nemachilichthys ruppelli', a change that should be reflected in the title and in the rest of the text of Keskar et al. (2015).

  11. Acute copper toxicity in juvenile fat snook Centropomus parallelus (Teleostei: Centropomidae in sea water

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    Bruno L. Oliveira

    Full Text Available Three experiments were designed to assess the accumulation and acute toxicity of copper (Cu in juvenile fat snook Centropomusparallelus. The first experiment was performed to determine the 96-h lethal concentration (LC50 of Cu. The second experiment was designed to assess the effects of sublethal concentrations of Cu (0.47 and 0.94 mg/L, while the third one allowed us to test the recovery capacity of fish exposed to the sublethal concentrations Cu and kept in sea water without Cu addition. The LC50value for Cu was found to be 1.88 mg/L Cu. Fish exposed to the sublethal concentrations of Cu showed a significant accumulation of Cu in gills at 96 h respect to the control ones (0.43 µg/g Cu. No significant difference was observed in the accumulation of Cu in gills between fish exposed to 0.47 mg/L (1.09 µg/g Cu and 0.94 mg/L (1.26 µg/g Cu. Exposure (24 and 96 h to the sublethal concentrations of Cu tested induced DNA damage in the erythrocytes. The results show that acute exposure to sublethal concentrations induces Cu accumulation and DNA damage in fish, these effects being recovered after 240 h in sea water without Cu addition.

  12. Tooth morphology, implantation and replacement system of Hoplias malabaricus (Teleostei, Characiformes, Erythrinidae

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    RM. Hassunuma

    Full Text Available The oropharyngeal cavity of Hoplias malabaricus, an ichthyophagous freshwater fish, is anatomically adapted to predation. Macroscopic and microscopic analyses were conducted in order to study the morphology and system of implantation and replacement of teeth. The results showed that this teleost has conical and caniniform teeth, with an orthodentin crown covered by an enameloid cap and a vascularised orthodentin in the root. With regard to the implantation system, there is a junction between the tooth and the bone tissue, as a typical physiological dental ankylosis. The teeth are replaced by a resorption process of multinucleated giant cells that actively eliminate the dentin and bone tissue.

  13. Local ecological knowledge on the goliath grouper epinephelus itajara (teleostei: serranidae in southern Brazil

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    Leopoldo Cavaleri Gerhardinger

    Full Text Available The goliath grouper Epinephelus itajara is a large sized (> 400 kg and critically endangered marine fish, which is protected in many countries, including Brazil. Through the application of semi-structured interviews, we investigated the local ecological knowledge of seven fishermen specialist on catching E. itajara from the Babitonga bay, Santa Catarina, Brazil. Local long-line fisheries for E. itajara seemed to be a disappearing tradition in the studied site, with a detailed inherent local ecological knowledge system, which is also being lost. Our study also showed that fishermen engaged in recent fisheries, such as spear-fishing, can also possess a detailed local ecological knowledge system. Through the analysis of fishermen local ecological knowledge, several aspects of E. itajara life history were registered. This species is found in the inner and outer Babitonga bay, from saline waters to areas with a large input of freshwater, and inhabits submerged wooden substrates and artificial reefs such as shipwrecks, mooring pillars and cargo containers. It is known to spawn in December and subsequent summer months in the studied area. Spawning aggregations are usually seen in December (during full moon, being also eventually observed in January and February by our informants. While lobsters, spadefishes and octopuses seem to constitute the most important food items of inner bay E. itajara, outer bay individuals may feed on catfishes, crustaceans and other fish species. The goliath grouper is regarded as pacific and curious fish, but frequently display agonistic behavior in the presence of divers. Based on the perception of well experienced spear fishermen, we hypothesize that E. itajara undertakes seasonal migrations from the inner to the outer bay during summer, and that the studied population is suffering from growth over-fishing. Our data provides a practical evidence of how joining scientific and local ecological knowledge will likely benefit E. itajara local conservation and management practices by adding important new biological data into the decision-making process.

  14. MATE CHOICE IN AIDABLENNIUS-SPHYNX (TELEOSTEI, BLENNIIDAE) - FEMALES PREFER NESTS CONTAINING MORE EGGS

    NARCIS (Netherlands)

    KRAAK, SBM; VIDELER, JJ

    1991-01-01

    Criteria for female mate choice were investigated in a natural population of a Mediterranean blenny, Aidablennius sphynx. Removable test tubes in concrete blocks were offered as nests. Each tube was guarded by a male and females laid eggs in the tubes. Nests with larger broods received significantly

  15. Female preference and filial cannibalism in Aidablennius sphynx (Teleostei, Blenniidae); A combined field and laboratory study

    NARCIS (Netherlands)

    Kraak, SBM

    In the fish Aidablennius sphynx, in which males continuously care for up to 7000 eggs throughout the breeding season, females prefer to mate with males that already guard eggs, The present study shows that this preference appears to be adaptive because the probability of eggs being cannibalized

  16. The reproductive biology of the plata pompano, Trachinotus marginatus (Teleostei: Carangidae, in southern Brazil

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    Valéria M. Lemos

    2011-10-01

    Full Text Available The Plata pompano, Trachinotus marginatus (Cuvier, 1832, is an endemic carangid of the Southwestern Atlantic Ocean, occurring from Rio de Janeiro to Uruguay. This study describes the reproductive period, spawning type, the size at first gonadal maturation and the length-weight relationship of individuals sampled from landings of the artisanal and commercial fishing fleets in Rio Grande that operate along the coast of Rio Grande do Sul state, southern Brazil (~ 32ºS to the Uruguayan border (~ 34ºS. Monthly collections from September 2008 through January 2010 yielded 274 individuals ranging from 142 to 444 mm in total length (TL. The gonadal development stages were defined according to the histological examination of the ovaries and the testes. The relationship between TL (mm and total weight TW (g was statistically different between males (TW = 0.000463*TL2.7655 and females (TW = 0.000361*TL2.8131, showing negative allometric growth for both sexes. The sizes at first maturity were 187.2 mm and 254.9 mm for females and males, respectively. The presence of two modal groups of oocyte diameters suggested that total spawning occurred. The interpretation of the monthly variations of the condition factor and gonadosomatic index, which are associated with higher frequencies of the more advanced stages of gonadal development, identified the spring and summer months as the reproductive period, with a peak in the reproductive activity during November and January. These results suggested that the species has an opportunistic reproductive strategy.

  17. Parasites in sexual and asexual mollies (Poecilia, Poeciliidae, Teleostei): a case for the Red Queen?

    Science.gov (United States)

    Tobler, Michael; Schlupp, Ingo

    2005-06-22

    The maintenance of sexual reproduction in the face of its supposed costs is a major paradox in evolutionary biology. The Red Queen hypothesis, which states that sex is an adaptation to fast-evolving parasites, is currently one of the most recognized explanations for the ubiquity of sex and predicts that asexual lineages should suffer from a higher parasite load if they coexist with closely related sexuals. We tested this prediction using four populations of the sexual fish species Poecilia latipinna and its asexual relative Poecilia formosa. Contrary to expectation, no differences in parasite load could be detected between the two species.

  18. Cytogenetic analysis of two locariid species (Teleostei, Siluriformes from Iguatemi River (Parana River drainage in Brazil

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    Carlos Alexandre Fernandes

    2015-03-01

    Full Text Available Fishes of the Loricariidae family, known as “cascudos”, constitute an endemic group in Neotropical freshwaters. In this study, were cytogenetically examined two species of Loricariidae (Pterygoplichthys anisitsi Eigenmann & Kennedy, 1903 and Farlowella amazonum (Günther, 1864 belonging to Hypostominae and Loricariinae subfamilies respectively from Iguatemi River. Our study provide the first description regarding C-band and fluorochromic analysis in F. amazonum. In Farlowella amazonum, diploid number was 58 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric regions of some chromosomes and large subtelomeric blocks were evidenced on the long arm of the pair 27, being this region CMA3+/DAPI-. The Pterygoplichthys anisitsi showed diploid number equal 52 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric and telomeric regions of some chromosomes and conspicuous large telomeric blocks on the long arm of the pair 10, being this region CMA3+/DAPI-. The results show that karyotype formula is nonconservative in P. anisitsi and F. amazonum.

  19. Diversity of neotropical electric fish Microsternarchus (Teleostei: Gymnotiformes: Hypopomidae: an electrophysiological and geometric morphometric approach

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    Adília Nogueira

    2015-11-01

    Full Text Available The South American hypopomid electric fish tribe Microsternarchini includes three small species from the Upper Orinoco and Negro rivers. These are placed in monotypic genera: Microsternarchus, Racenisia and Procerusternarchus. Recent collections from tributaries in Negro, Solimões and Amazonas Basins have revealed new specimens of Microsternarchus with significant variations in external morphology and in Electric Organ Discharge parameters (EOD. In order to estimate the diversity within the genus a previous molecular study was done using DNA barcoding, that suggested the presence of multiple Microsternarchus's lineages with high levels of genetic divergence between them. Here we try to determine if the variation in morphology and EOD parameters in the new specimens meet the genetic divergence found. To test the presence of differences in shape among the different lineages we performed a geometric morphometric analysis, which included a relative warp and multivariate analysis on distances between 14 anatomical landmarks defined on the basis of external morphology and homologous among the lineages. The EOD variations were also explored using multivariate analyses of 20 electrophysiological parameters calculated through an algorithm developed in Matlab. The results show that there are significant differences in body shape and EOD in three lineages of Microsternarchus, and the features that contributed most were related to the shape of the head, the coefficient of variation of the signal and the duration and area of the different phases of the pulse. The discrimination of the three lineages confirms the occurrence of new species in the group that are currently being described.

  20. Intersexuality of Scomberomorus niphonius from the Coastal Area around Jeju Island, Korea (Teleostei: Scombridae)

    Science.gov (United States)

    Kim, Jong Bin; Chang, Dae Soo; Kim, Hyejin; Jeon, Mi Ae; Ku, Kayeon; Lee, Jung Sick

    2013-01-01

    This study histologically describes the intersexuality of Scomberomorus niphonius collected from the coastal area near Jeju Island. A total of 126 S. niphonius, collected from March to July 2012 with a total length of 62.4 cm (±17.5) and a total weight of 1,701.9 g (±1,528.9) were used for analyses. From a histological perspective, two types of intersex were confirmed. One type had scattered germ cells from the opposite sex within the gonad. The second type developed germ cells from the opposite sex in the connective tissue of the outer gonadal membrane. The intersexuality was 14.3% (n=18/126), with females (21.3%; n=16/75) exhibiting a higher rate than males (3.9%; n=2/51). There was no displayed correlation between intersexuality and the total length and weight. PMID:25949123

  1. Juvenile Thalassoma amblycephalum Bleeker (Labridae, Teleostei) dwelling among the tentacles of sea anemones

    DEFF Research Database (Denmark)

    Arvedlund, Michael; Iwao, Kenji; Brolund, Thea Marie

    2006-01-01

    each) of the juvenile wrasse Thalassoma amblycephalum dwelling among the tentacles of the two sea anemones Entacmaea quadricolor (clonal type), and Heteractis magnifica at a coral reef in southern Japan during 16 months in daylight hours. There are only two past records of this facultative association......, one from east Africa and one from Indonesia. The wrasse remained close to and was occasionally in physical contact with the host when foraging amongst the tentacles. When frightened, they took shelter among corals, away from the host anemone. The wrasse co-existed with the anemonefishes Amphiprion...

  2. Embryonic Developmental Stages of African Giant Catfish Heterobranchus longifilis (Valenciennes, 1840) (Teleostei, Clariidae)

    Science.gov (United States)

    Wilfred-Ekprikpo, P. C.

    2016-02-01

    One of the major challenges confronting the globe is the issue of food insecurity. This problem results from inadequate protein intake by humans especially those people from the third world countries. In order to arrest this ugly situation, there is the need to increase protein production by intensifying aquaculture. In sub-saharan Africa, particularly Nigeria, the major aquaculture species is African mud catfish (Clarias gariepinus) and its production has increase protein output but the protein deficit is still wide. Thus, necessitating the need to develop other aquaculture species endemic to the region. One of these species is Heterobranchus and there successful breeding depending on a good understanding of their biology. The embryonic developmental stages of Heterobranchus longifilis in freshwater tanks were determined. The first cleavage cell division occurred 30 minutes after fertilization of eggs while, the morula stage was observed within 2 hours. The blastula stage occurred between 2 and 8 hours, while the gastrula stage occurred between 12 and 18 hours. Thereafter, neurulation period, and embryonic body formation appeared. The optical vesicle and auditory vesicle formed. Finally muscular contraction, tail formation, heartbeat and hatching occurred. The embryonic developmental stage of H. longifilis started immediately the oocyte (egg) was fertilized and terminated when the embryo hatched from the chorion membranous wall. The young larva emerged from the embryonic membrane at 24.46 hrs with vigorous lashing of the caudal region against the chorion membrane. The average weight and length of the yolk larvae were 0.005g and 0.43 cm respectively. The percentage fertilization and hatchability rates were 82.50 and 65.10% respectively. The experiment revealed that Heterobranchus longifilis could be a good aquaculture species.

  3. Higher and lower-level relationships of the deep-sea fish order alepocephaliformes (Teleostei

    DEFF Research Database (Denmark)

    Poulsen, Jan Y.; Møller, Peter R.; Lavoué, Sébastien

    2009-01-01

    , Cypriniformes, Characiformes, Siluriformes and Gymnotiformes). The disputed family Bathylaconidae was found to be an artificial assemblage of the two genera Bathylaco and Herwigia, with the former as the sister group of the family Alepocephalidae and the latter nested within Alepocephalidae. Platytroctidae...

  4. Parasitofauna study of the brown trout, Salmo trutta (Pisces, Teleostei from Corsica (Mediterranean island rivers

    Directory of Open Access Journals (Sweden)

    Quilichini Y.

    2007-09-01

    Full Text Available Corsica is a mediterranean island characterised by a great number of rivers. Salmonides are the main fishes which populate these rivers. Very appreciated by fishermen, Salmonides are represented by three species in the insular hydrographical network, among which an autochthonous species, the brown trout (Salmo trutta. In the present work, we have analysed the parasitofauna of this species. According to our knowledge, this research has never been carried out in Corsica. In a first step, we drew up an inventory of the parasites found in this freshwater fish. In a second step, we studied the differences which appeared in the composition of parasite communities of this species.

  5. Ureotelism is inducible in the neotropical freshwater Hoplias malabaricus (Teleostei, Erythrinidae

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    G. Moraes

    Full Text Available Increased environmental pH decreases ammonia transport through the gills, impairing nitrogenous waste. The consequent toxicity is usually drastic to most fishes. A few species are able to synthesize urea as a way to detoxify plasma ammonia. We studied three teleosts of the family Erythrinidae living in distinct environments, and assumed the biochemical behaviors would be different in spite of their being closely related species. Adult fish collected in the wild were submitted to alkaline water and the urea excretion rate was determined. The specific activity of urea cycle enzymes was determined in liver samples of fish from neutral waters. The studied species Hoplias lacerdae, Hoplerithrynus unitaeniatus, and Hoplias malabaricus are ureogenic. Urea synthesis is not a metabolic way to detoxify ammonia in H. lacerdae and Hoplerithrynus unitaeniatus exposed to an alkaline environment. The plasma ammonia profile of both species showed two distinct biochemical responses. Urea excretion of H. malabaricus was high in alkaline water, and the transition to ureotelism is proposed. The nitrogen excretion rate of H. malabaricus was among the highest values reported and the high urea excretion leads us to include this species as ureotelic in alkaline water.

  6. Genetic differentiation among natural populations of the Nile tilapia Oreochromis niloticus (Teleostei, cichlidae).

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    Agnèse, J F; Adépo-Gourène, B; Abban, E K; Fermon, Y

    1997-07-01

    We analysed the genetic differentiation among 17 natural populations of the Nile tilapia Oreochromis niloticus (Linnaeus, 1758) using allozymes and restriction fragment length polymorphism (RFLP) of mitochondrial DNA (mtDNA). The populations studied, from the River Senegal to Lake Tana and from Lake Manzalla to Lake Baringo, represent all subspecies which have been previously described. Sixteen variable nuclear loci showed that these populations can be clustered in three groups: (1) West African populations (Senegal, Niger, Volta and Chad drainages), (2) Ethiopian Rift Valley populations (Lakes Awasa, Ziway, Koka and the Awash River) and (3) Nile drainage (Manzalla, Cairo, Lake Edward) and Kenyan Rift Valley populations (Lakes Turkana, Baringo and River Suguta). Nine different mtDNA haplotypes were found in the RFLP analysis of a 1 kb portion of the D-loop region. The network obtained showed that there are three geographically distinct groups; all West African populations and O. aureus are clustered, the two Ethiopian Rift Valley populations are distinct and between these two groups are the Kenyan and Ugandan Rift Valley populations. Nile populations show affinities both with West African populations and with specimens from Lakes Tana and Turkana. Taxonomic and biogeographical implications of these results are discussed.

  7. Garra sindhi, a new species from the Jebel Samhan Nature Reserve in Oman (Teleostei: Cyprinidae).

    Science.gov (United States)

    Lyon, Robert Gary; Geiger, Matthias F; Freyhof, Jörg

    2016-08-18

    Garra sindhi, new species, is described from Wadi Andhur in the Dhofar province of the Sultanate of Oman. It is closely related to G. dunsirei and G. smarti, two other species from the same Omani province. It differs from these species by the following combination of characters: breast covered by scales, a shallow hump on back, eyes normally developed and 8-12 gill rakers on the lower limb of the first gill arch.

  8. Pethia sanjaymoluri, a new species of barb (Teleostei: Cyprinidae) from the northern Western Ghats, India.

    Science.gov (United States)

    Katwate, U; Jadhav, S; Kumkar, P; Raghavan, R; Dahanukar, N

    2016-05-01

    Pethia sanjaymoluri, a new cyprinid, is described from the Pavana and Nira tributaries of Bhima River, Krishna drainage, Maharashtra, India. It can be distinguished from congeners by a combination of characteristics that includes an incomplete lateral line, absence of barbels, upper lip thick and fleshy, 23-25 lateral series scales, 7-12 lateral-line pored scales, 10 predorsal scales, 11-14 prepelvic scales, 17-20 pre-anal scales, 4½ scales between dorsal-fin origin and lateral line, four scales between lateral line and pelvic-fin origin, 8-15 pairs of serrae on distal half of dorsal-fin spine, 12-14 branched pectoral-fin rays, 4 + 26 total vertebrae, 4 + 5 predorsal vertebrae, 4 + 13 abdominal vertebrae, 13 caudal vertebrae and a unique colour pattern comprising a humeral spot positioned below the lateral line and encompassing the third and fourth lateral-line scales and one scale below, one caudal spot on 17th-21st lateral-line scales with a yellow hue on its anterior side and apical half of dorsal fin studded with melanophores making the fin tip appear black. Genetic analysis based on the mitochondrial cytochrome b gene sequence suggests that the species is distinct from other known species of Pethia for which data are available. © 2016 The Fisheries Society of the British Isles.

  9. Reproduction and food habits of the lined seahorse, Hippocampus erectus (Teleostei: Syngnathidae) of Chesapeake Bay, Virginia

    OpenAIRE

    TEIXEIRA R. L.; Musick, J A

    2001-01-01

    The reproductive and feeding biology of the lined seahorse, Hippocampus erectus, was studied in Chesapeake Bay. Seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). Females do not play any parental care after mating. Total sex ratio and the operational sex ratio was strongly skewed toward females. Males and females had similar number of eggs/embryos and hydrated oocytes, respectively. The number of eggs/embryos found in the male br...

  10. Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy

    OpenAIRE

    Mirande, Juan Marcos

    2010-01-01

    The family Characidae is the most diverse among Neotropical fishes. Systematics of this family are mainly based on pre-cladistic papers, and only recently a phylogenetic hypothesis for Characidae was proposed by the author. That phylogeny was based on 360 morphological characters studied for 160 species, including representatives of families related to Characidae. This paper is based on that phylogenetic analysis, with the analyzed characters described herein and documented, accompanied by co...

  11. [Effects of thyroid hormone level alterations on the Weberian apparatus ontogeny of cyprinids (Cyprinidae; Teleostei)].

    Science.gov (United States)

    Kapitanova, D V; Shkil', F N

    2014-01-01

    Effects of thyroid hormone (TH) level alterations on the development and definitive morphology of the Weberian apparatus (WA, morphofunctional complex, providing transmission of sound signals from the gas bladder to the labyrinth of inner ear) were experimentally assessed in cyprinid fishes (Labeobarbus intermedius and Danio rerio). Alterations of TH-level were shown to lead to heterochronies, changes of timing and rates of ontogenetic events resulting in changes of definitive morphology of some structures as well as of the WA as a whole. Differences, in reaction of WA structures to the TH-level alterations, and inter- and intraspecific variability of TH-responsiveness were revealed.

  12. Osteology of Priocharax and remarkable developmental truncation in a miniature Amazonian fish (Teleostei: Characiformes: Characidae).

    Science.gov (United States)

    Mattox, George M T; Britz, Ralf; Toledo-Piza, Mônica

    2016-01-01

    Establishing phylogenetic relationships of miniature fishes is challenging in taxa with developmental truncation. Within the Characiformes, developmental truncation appears to be relatively rare, with the Neotropical genus Priocharax being an example. Priocharax includes three miniature species among the smallest of the order and has been hypothesized to belong to the Heterocharacinae. The pronounced reduction in its skeleton, however, prevented a clearer evaluation of its relationships. The present detailed osteological study was designed to address this question and revealed that 21 bones are absent and nine other skeletal structures are simplified in Priocharax when compared to other characids. Comparison of the skeleton of adult Priocharax with early developmental stages of other characids demonstrated that most of the absences and simplifications can be interpreted as developmental truncations. The most striking developmental truncations are in the pectoral girdle, in which the endoskeleton remains entirely cartilaginous. Other interesting truncations are in the ethmoid region of the skull, infraorbital series, and Weberian apparatus, in which the claustrum is absent. Our study also revealed some unusual sexual dimorphisms in the pelvic girdle. Two cladistic analyses were performed to assess the relationships of Priocharax within the Heterocharacinae. The first consisted of a traditional analysis in which all absences and reductions of Priocharax were coded in the same way as in the remaining taxa. This resulted in three equally most parsimonious topologies, all of which have Priocharax as the most basal taxon of the Heterocharacinae. The second analysis incorporated ontogenetic information, and most absences and reductions of Priocharax were reinterpreted as apomorphic conditions and thus, coded differently from similar conditions in outgroups. This resulted in a single phylogenetic hypothesis with Priocharax and Gnathocharax as sister groups based on seven synapomorphies. Our approach demonstrates the importance of developmental studies to better understand morphological evolution of miniaturized, truncated taxa, and to generate hypotheses of their relationships. © 2015 Wiley Periodicals, Inc.

  13. A new clupavidae (teleostei, ostariophysi) from the Cenomanian of Daoura (Morocco)

    Science.gov (United States)

    Cavin, Lionel

    1999-11-01

    Lusitanichthys africanus n. sp. from Daoura, an Upper Cenomanian locality situated about 100 km south of Erfoud (southeastern Morocco), is described. L. africanus is very similar to L. characiformis. Lusitanichthys shows modifications of the first vertebral elements indicating the presence of a primitive Weberian apparatus. Clupavus maroccanus and Lusitanichthys belong to the clupavids. Anatomical characters of L. africanus from the Weberian apparatus and the caudal skeleton allow us to include it in Otophysi without sure indications of ordinal affinities.

  14. Discovering Hidden Diversity of Characins (Teleostei: Characiformes) in Ecuador’s Yasuní National Park

    Science.gov (United States)

    Escobar-Camacho, Daniel; Barriga, Ramiro; Ron, Santiago R.

    2015-01-01

    Background Management and conservation of biodiversity requires adequate species inventories. The Yasuní National Park is one of the most diverse regions on Earth and recent studies of terrestrial vertebrates, based on genetic evidence, have shown high levels of cryptic and undescribed diversity. Few genetic studies have been carried out in freshwater fishes from western Amazonia. Thus, in contrast with terrestrial vertebrates, their content of cryptic diversity remains unknown. In this study, we carried out genetic and morphological analyses on characin fishes at Yasuní National Park, in eastern Ecuador. Our goal was to identify cryptic diversity among one of the most speciose fish families in the Amazon region. This is the first time that genetic evidence has been used to assess the species content of the Napo Basin, one of the richest regions in vertebrate diversity. Results Phylogenetic analyses of partial mitochondrial 16S ribosomal RNA gene (∼600 pb) DNA sequences from 232 specimens of the family Characidae and its closest groups revealed eight candidate new species among 33 species sampled, representing a 24% increase in species number. Analyses of external morphology allowed us to confirm the species status of six of the candidate species. Conclusions Our results show high levels of cryptic diversity in Amazonian characins. If this group is representative of other Amazonian fish, our results would imply that the species richness of the Amazonian ichthyofauna is highly underestimated. Molecular methods are a necessary tool to obtain more realistic inventories of Neotropical freshwater fishes. PMID:26275041

  15. Revision of the jawfish genus Lonchopisthus with description of a new Atlantic species (Teleostei: Opistognathidae)

    Science.gov (United States)

    Smith-Vaniz, William F.; Walsh, Stephen J.

    2017-01-01

    Synonymies, diagnoses, descriptions, illustrations, an identification key, and meristic frequency tables are provided for all species of Lonchopisthus. Most of the skeletal anatomy of L. higmani is also illustrated. A new jawfish, Lonchopisthus ancistrus n. sp., is described from the Gulf of Mexico and off Honduras based on 21 specimens 41–89 mm SL. The new species differs from other congeners by the following combination of characters: the posterior end of the maxilla strongly hooked; the membrane connecting the maxilla and premaxilla and the inner membrane covering the posterior part of the dentary pale; segmented dorsal-fin rays 11–13, with unbranched rays 2–5; longitudinal body-scale rows 33–39; and very long pelvic fins, 39.4–75.3% SL. Lonchopisthus lemur (and its synonym L. meadi) shares most characters with L. ancistrus, but differs in having shorter pelvic fins, 19.2–29.9% SL; fewer longitudinal body-scale rows, 26–33; and 5 infraorbitals (vs. 4). Both are relatively deep-water species, occurring from 100 m to at least 375 m (vs. 3–139 m in the other species). Lonchopisthus micrognathus is unique in having no branched caudal-fin rays at any size and the middle caudal-fin rays with free tips that may be used to maintain tactile contact with the substrate while hovering over its burrow. The western Atlantic Lonchopisthus higmani and eastern Pacific L. sinuscalifornicus are sister species that differ from the other Atlantic species in having the posterior end of the maxilla with a notch instead of a strong hook, the opercle with a large dark blotch, and one supraneural (vs. no supraneural).

  16. Characteristics of infection of Diplectanum sp. (Monogenea: Monopisthocolytea: Diplectanidae in Cynoscion analis Jenyns (Pisces: teleostei: Scianidae

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    José Iannacone

    2014-06-01

    Full Text Available 120 Cynoscion analis Jenyns were collected from Chorrillos fishmarket, Lima, Perú, between January and February 2000 and necropsied to study ectoparasite monogenean Diplectanum sp. from branchial filaments. This parasite was considered a core specie, because it parasites 2/3 hosts examined. Of the fishes collected 80 were female and 40 male. Females and males showed a standard length between 16,4-27,0 cm (mean = 21,08 ± 2,24 and 16,5-26,3 cm (mean = 20,47 ± 2,06, respectively. The prevalence of infection of Diplectanurn was 72,5%, mean intensity and abundance were 3,16 ± 2,84 and 2,29 ± 2,80 respectively. This monogenean showed an overclispersal spatial distribution (2,55 at level of fish hosts. We observed a correlation between mean intensity of infestation and standard length of C. analis. Males (4,14 ± 3,75 showed a higher mean intensity than females (2,67 ± 2,14. A high prevalence, intensity and abundance of Diplectanum to 11 gill was found. However, we did not find neither preference when we separated each gill in three parts (fore, middle and hind respectively. Finally, we compared our results of population assemblages of other ectoparasite monogeneans in marine fishes. Diplectanurn sp. is a new record to C. analis and to Peru.

  17. Neoniphon pencei , a new species of holocentrid ( Teleostei : Beryciformes ) from Rarotonga, Cook Islands

    OpenAIRE

    Copus, Joshua M.; Pyle, Richard L.; Earle, John L.

    2015-01-01

    Abstract Neoniphon pencei , n. sp., is described from thirteen specimens, 132-197 mm standard length (SL) collected from mesophotic coral ecosystems (MCEs) at Rarotonga, Cook Islands by divers using mixed-gas closed-circuit rebreathers. It differs from all other species of the genus in number of lateral line scales, scales above and below lateral line, elements of life color, and in COI and cytochrome b DNA sequences. Of the five other known species of Neoniphon , it is most similar to the In...

  18. Neoniphonpencei, a new species of holocentrid (Teleostei: Beryciformes) from Rarotonga, Cook Islands.

    Science.gov (United States)

    Copus, Joshua M; Pyle, Richard L; Earle, John L

    2015-01-01

    Neoniphonpencei, n. sp., is described from thirteen specimens, 132-197 mm standard length (SL) collected from mesophotic coral ecosystems (MCEs) at Rarotonga, Cook Islands by divers using mixed-gas closed-circuit rebreathers. It differs from all other species of the genus in number of lateral line scales, scales above and below lateral line, elements of life color, and in COI and cytochrome b DNA sequences. Of the five other known species of Neoniphon, it is most similar to the Indo-Pacific N.aurolineatus and the western Atlantic N.marianus both morphologically and genetically.

  19. Neoniphon pencei, a new species of holocentrid (Teleostei: Beryciformes from Rarotonga, Cook Islands

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    Joshua Copus

    2015-01-01

    Full Text Available Neoniphon pencei, n. sp., is described from thirteen specimens, 132-197 mm standard length (SL collected from mesophotic coral ecosystems (MCEs at Rarotonga, Cook Islands by divers using mixed-gas closed-circuit rebreathers. It differs from all other species of the genus in number of lateral line scales, scales above and below lateral line, elements of life color, and in COI and cytochrome b DNA sequences. Of the five other known species of Neoniphon, it is most similar to the Indo-Pacific N. aurolineatus and the western Atlantic N. marianus both morphologically and genetically.

  20. Reproduction and food habits of the lined seahorse, Hippocampus erectus (Teleostei: Syngnathidae) of Chesapeake Bay, Virginia.

    Science.gov (United States)

    Teixeira, R L; Musick, J A

    2001-02-01

    The reproductive and feeding biology of the lined seahorse, Hippocampus erectus, was studied in Chesapeake Bay. Seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). Females do not play any parental care after mating. Total sex ratio and the operational sex ratio was strongly skewed toward females. Males and females had similar number of eggs/embryos and hydrated oocytes, respectively. The number of eggs/embryos found in the male brood pouch varied from 97 to 1,552 (fish from 80 to 126 mm TL), whereas the number of hydrated oocytes in female varied from 90 to 1,313 (fish from 60 to 123 mm TL). Both, the number of eggs/embryos and hydrated oocytes were better linearly correlated to total weight than to total length. The small snout and mouth size limits the feeding of the lined seahorse to small prey size. Amphypods were the predominant food items found in the guts, especially Ampithoe longimana, Gammarus mucronatus, and Caprella penantis. The lined seahorse is not abundant in Chesapeake Bay, but keeps a breeding population which is probably brought inside the bay by currents on drifting vegetation. Chances to find a partner may be difficult because of its low abundance, due to turbid waters, and its sedentary behavior.

  1. Stable isotope evidence for trophic overlap of sympatric Mexican Lake Chapala silversides (Teleostei: Atherinopsidae: Chirostoma spp.

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    Norman Mercado-Silva

    Full Text Available We explore the trophic role that a diverse sympatric group of fishes in the genus Chirostoma play in a large, shallow lake in central Mexico, Lake Chapala. We use δ13C and δ15N stable isotope - based food web analyses to explore how they relate to other components of the Lake Chapala ecosystem. We find five Chirostoma species in top trophic levels of the Chapala food web compared to other fishes, relying on a combination of zooplankton, fish and benthic resources as energy sources. Food web metric analyses showed generally overlapping trophic niches for members of Chirostoma, especially in terms of δ13C. However, C. jordani had lower mean δ15N isotopic values than C. promelas. As a group, "pescados blancos" (C. sphyraena and C. promelas also had higher δ15N signatures than "charales" (C. consocium, C. jordani and C. labarcae reflecting greater piscivory, but these differences were not strong for all food web metrics used. Trophic overlap among species of Chirostoma in Lake Chapala raises questions about the forces that might have led to a morphologically diverse but functionally similar and monophyletic group of species.

  2. Gonad maturation of Haemulon plumieri (Teleostei: Haemulidae in Ceará state, Northeastern Brazil

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    RA Shinozaki-Mendes

    Full Text Available To elucidate the reproductive cycle of any animal, it is first necessary to understand the development of the germ cells and how this process occurs throughout the reproductive tract. Thus, the aim of the present study was to understand the oogenesis and spermatogenesis, as well as the ovarian and testis maturation and type of spawning, of Haemulon plumieri. A total of 119 females and 136 males were analysed. Based on micro and macroscopic characteristics of gonads, the following stages of maturation for females were determined: immature, maturing, ripe, partially spawning, spawning and resting. For males, only the stages immature, maturing, ripe and spent were observed. We can conclude that the ovarian development occurs cyclically, in which the female can spawn more than two times during the reproductive season with the spawning “synchronous in more than two groups”. Since males do not present the “rest” stage after copulation, the maturation process is continuous.

  3. Multiple invasions into freshwater by pufferfishes (teleostei: tetraodontidae: a mitogenomic perspective.

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    Yusuke Yamanoue

    Full Text Available Pufferfishes of the Family Tetraodontidae are the most speciose group in the Order Tetraodontiformes and mainly inhabit coastal waters along continents. Although no members of other tetraodontiform families have fully discarded their marine lives, approximately 30 tetraodontid species spend their entire lives in freshwaters in disjunct tropical regions of South America, Central Africa, and Southeast Asia. To investigate the interrelationships of tetraodontid pufferfishes and thereby elucidate the evolutionary origins of their freshwater habitats, we performed phylogenetic analysis based on whole mitochondrial genome sequences from 50 tetraodontid species and closely related species (including 31 newly determined sequences. The resulting phylogenies reveal that the family is composed of four major lineages and that freshwater species from the different continents are independently nested in two of the four lineages. A monophyletic origin of the use of freshwater habitats was statistically rejected, and ancestral habitat reconstruction on the resulting tree demonstrates that tetraodontids independently entered freshwater habitats in different continents at least three times. Relaxed molecular-clock Bayesian divergence time estimation suggests that the timing of these invasions differs between continents, occurring at 0-10 million years ago (MA in South America, 17-38 MA in Central Africa, and 48-78 MA in Southeast Asia. These timings are congruent with geological events that could facilitate adaptation to freshwater habitats in each continent.

  4. Electric signals in the social behavior of sympatric elephantfish (Mormyridae, Teleostei) from the upper Zambezi River.

    Science.gov (United States)

    Scheffel, A; Kramer, B

    2000-03-01

    Electrocommunication in mormyrid fish from African freshwaters is a challenging research field in neuroethology (Turner et al. 1999). However, virtually nothing is known about electrocommunication within natural mormyrid populations involving sympatric, syntopic species. Here we report on the nocturnal activities and electrocommunication among three syntopic species in a spacious laboratory setting resembling the natural one. Petrocephalus catostoma, Cyphomyrus discorhynchus, and Hippopotamyrus sp. nov. differ characteristically in their behavior, such as in territorial defense, schooling, and joining members of other species during foraging. Comparing social encounters within and between species, the first evidence for interspecific electrocommunication among syntopic species was found.

  5. A molecular phylogeny of the Percidae (Teleostei, Perciformes) based on mitochondrial DNA sequence.

    Science.gov (United States)

    Sloss, Brian L; Billington, Neil; Burr, Brooks M

    2004-08-01

    The family Percidae is among the most speciose families of northern hemisphere fishes with > 178 178 North American species and 14 Eurasian species. Previous phylogenetic studies have been hampered by a lack of informative characters, inadequate taxonomic sampling, and conflicting data. We estimated phylogenetic relationships among 54 percid species (9 of 10 genera and all but one subgenus of darters) and four outgroup taxa using mitochondrial DNA data from the 12S rRNA and cytochrome b genes. Four primary evolutionary lineages were consistently recovered: Etheostomatinae (Ammocrypta, Crystallaria, Etheostoma, and Percina), Perca, Luciopercinae (Romanichthys, Sander, and Zingel), and Gymnocephalus. Except Etheostoma and Zingel, all polytypic genera were monophyletic. The Etheostoma subgenus Nothonotus failed to resolve with other members of the genus resulting in a paraphyletic Etheostoma. The subfamily Percinae (Gymnocephalus and Perca) was not recovered in phylogenetic analyses with Gymnocephalus sister to Luciopercinae. Etheostomatinae and Romanichthyini were never resolved as sister groups supporting convergent evolution as the cause of small, benthic, stream-inhabiting percids in North American and Eurasian waters.

  6. Laimosemion leticia (Teleostei: Cyprinodontiformes: Rivulidae), a new species from the upper Rio Amazonas, Southern Colombia.

    Science.gov (United States)

    Valdesalici, Stefano

    2016-03-02

    Laimosemion leticia is described from the Rio Tacana drainage, upper Rio Amazonas basin, Southern Colombia. The new species was found in a shallow swamp within a tropical rainforest in the vicinity of Leticia, capital of the department of Amazonas and southernmost municipality of Colombia. This miniature species is considered to be a member of the Owiyeye subgenus, which is diagnosed by a unique frontal squamation. Laimosemion leticia can be distinguished from all other species of the genus by the unique colour pattern on the unpaired fins. The new species appears related to L. jauaperi, L. uatuman and L. ubim due to the similar flank colour pattern in males, but is easy distinguished by coloration of the unpaired fins and morphological characters.

  7. Molecular Phylogeny and Biogeography of the Amphidromous Fish Genus Dormitator Gill 1861 (Teleostei: Eleotridae)

    Science.gov (United States)

    Galván-Quesada, Sesángari; Doadrio, Ignacio; Alda, Fernando; Perdices, Anabel; Reina, Ruth Gisela; García Varela, Martín; Hernández, Natividad; Campos Mendoza, Antonio; Bermingham, Eldredge; Domínguez-Domínguez, Omar

    2016-01-01

    Species of the genus Dormitator, also known as sleepers, are representatives of the amphidromous freshwater fish fauna that inhabit the tropical and subtropical coastal environments of the Americas and Western Africa. Because of the distribution of this genus, it could be hypothesized that the evolutionary patterns in this genus, including a pair of geminate species across the Central American Isthmus, could be explained by vicariance following the break-up of Gondwana. However, the evolutionary history of this group has not been evaluated. We constructed a time-scaled molecular phylogeny of Dormitator using mitochondrial (Cytochrome b) and nuclear (Rhodopsin and β-actin) DNA sequence data to infer and date the cladogenetic events that drove the diversification of the genus and to relate them to the biogeographical history of Central America. Two divergent lineages of Dormitator were recovered: one that included all of the Pacific samples and another that included all of the eastern and western Atlantic samples. In contrast to the Pacific lineage, which showed no phylogeographic structure, the Atlantic lineage was geographically structured into four clades: Cameroon, Gulf of Mexico, West Cuba and Caribbean, showing evidence of potential cryptic species. The separation of the Pacific and Atlantic lineages was estimated to have occurred ~1 million years ago (Mya), whereas the four Atlantic clades showed mean times of divergence between 0.2 and 0.4 Mya. The splitting times of Dormitator between ocean basins are similar to those estimated for other geminate species pairs with shoreline estuarine preferences, which may indicate that the common evolutionary histories of the different clades are the result of isolation events associated with the closure of the Central American Isthmus and the subsequent climatic and oceanographic changes. PMID:27074006

  8. Evolution and phylogenetic application of the MC1R gene in the Cobitoidea (Teleostei: Cypriniformes).

    Science.gov (United States)

    Tang, Qiong-Ying; Shi, Li-Xia; Liu, Fei; Yu, Dan; Liu, Huan-Zhang

    2016-09-18

    Fish of the superfamily Cobitoidea sensu stricto (namely loaches) exhibit extremely high diversity of color patterns, but so far little is known about their evolutionary mechanism. Melanocortin 1 receptor gene (MC1R) plays an important role during the synthesis of melanin and formation of animal body color patterns. In this study, we amplified and sequenced the partial MC1R gene for 44 loach individuals representing 31 species of four families. Phylogenetic analyses yielded a topology congruent with previous studies using multiple nuclear loci, showing that each of the four families was monophyletic with sister relationships of Botiidae+ (Cobitidae+(Balitoridae+Nemacheilidae)). Gene evolutionary analyses indicated that MC1R in loaches was under purifying selection pressure, with various sites having different dN/dS values. Both Botiidae and Cobitidae had lower dN/dS values than those of background lineages, suggesting their evolution might be strongly affected by purifying selection pressure. For Balitoridae and Nemacheilidae, both had larger dN/dS values than those of background lineages, suggesting they had a faster evolutionary rate under more relaxed selection pressure. Consequently, we inferred that the relatively stable color patterns in Botiidae and Cobitidae might result from the strong purifying selection pressure on the MC1R gene, whereas the complicated and diverse color patterns in Balitoridae and Nemacheilidae might be associated with the relaxed selection pressure. Given the easy experimental procedure for the partial MC1R gene and its excellent performance in reconstructing phylogeny, we suggest this gene could be used as a good molecular marker for the phylogenetic study of fish species.

  9. Population characteristics, space use and habitat associations of the seahorse Hippocampus reidi (Teleostei: Syngnathidae

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    Ierecê Lucena Rosa

    Full Text Available This paper provides a case study of a threatened seahorse species, Hippocampus reidi, highlighting the importance of using ecological information to assist conservation and management initiatives. Underwater visual sighting data (50 x 2m transect gathered along the NE, SE and S portions of the Brazilian coast revealed an unequal distribution across localities, perhaps related to harvesting pressure, and a mean density of 0.026 ind.m-2. Our findings suggest some restricted spatial use by H. reidi, which was consistent with its estimated home range, and with re-sighting of specimens. Reproduction was recorded year-round, however productive peaks may exist. Components of habitat structure mostly used as anchoring points were mangrove plants, macroalgae, cnidarians, seagrass, sponges, and bryozoans. Conservation recommendations include: further characterization and mapping of habitats; assessment of availability and condition of microhabitats in selected areas, and studies on dispersal routes during initial life stages.

  10. A new species of torrent catfish, Liobagrus hyeongsanensis (Teleostei: Siluriformes: Amblycipitidae), from Korea.

    Science.gov (United States)

    Kim, Su-Hwan; Kim, Hyeong-Su; Park, Jong-Young

    2015-08-27

    A new species of torrent catfish, Liobargus hyeongsanensis, is described from rivers and tributaries of the southeastern coast of Korea. The new species can be differentiated from its congeners by the following characteristics: a small size with a maximum standard length (SL) of 90 mm; body and fins entirely brownish-yellow without distinct markings; a relatively short pectoral spine (3.7-6.5 % SL); a reduced body-width at pectoral-fin base (15.5-17.9 % SL); 50-54 caudal-fin rays; 6-8 gill rakers; 2-3 (mostly 3) serrations on pectoral fin; 60-110 eggs per gravid female.

  11. Aspidoras mephisto, new species: The first troglobitic Callichthyidae (Teleostei: Siluriformes) from South America.

    Science.gov (United States)

    Tencatt, Luiz Fernando Caserta; Bichuette, Maria Elina

    2017-01-01

    Aspidoras mephisto n. sp. is described from the Anésio-Russão cave system, upper Tocantins River basin, Goiás, Brazil. The species can be readily distinguished from its congeners by troglomorphic features and also by presenting the following combination of features: infraorbital 1 generally with well-developed ventral laminar; or moderately developed; poorly-developed serrations on posterior margin of pectoral spine; nuchal plate not externally visible; dorsal fin, even in conspicuously colored specimens, with only dark brown or black chromatophores concentrated on rays, forming spots in some specimens; membranes hyaline; or sparse dark brown or black chromatophores on membranes, not forming any conspicuous pattern; and inner laminar expansion of infraorbital 1 moderately developed. Information about its habitat, ecology, behaviour and conservation status are provided and also a brief description of the juvenile stage.

  12. Leptobotia micra, a new species of loach (Teleostei: Botiidae) from Guilin, southern China

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Šlechtová, Vendula

    2017-01-01

    Roč. 4250, č. 1 (2017), s. 90-100 ISSN 1175-5326 R&D Projects: GA ČR GA13-37277S Institutional support: RVO:67985904 Keywords : Cypriniformes * Cobitoidea * taxonomy Subject RIV: EG - Zoology Impact factor: 0.972, year: 2016

  13. Population characteristics, space use and habitat associations of the seahorse Hippocampus reidi (Teleostei: Syngnathidae)

    OpenAIRE

    Ierecê Lucena Rosa; Oliveira,Tacyana P. R; Castro, André L. C.; Luiz E. de Souza Moraes; Xavier,Josias H. A.; Nottingham, Mara C; Dias, Thelma L. P.; Bruto-Costa,Leonardo V.; Maria E. Araújo; Birolo, Alesandra B.; Ana C. G. Mai; Cassiano Monteiro-Neto

    2007-01-01

    This paper provides a case study of a threatened seahorse species, Hippocampus reidi, highlighting the importance of using ecological information to assist conservation and management initiatives. Underwater visual sighting data (50 x 2m transect) gathered along the NE, SE and S portions of the Brazilian coast revealed an unequal distribution across localities, perhaps related to harvesting pressure, and a mean density of 0.026 ind.m-2. Our findings suggest some restricted spatial use by H. r...

  14. Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba.

    Science.gov (United States)

    Silva, Rodet Rodriguez

    2015-04-24

    Rivulus berovidesi, a new killifish species, is described from a small stream in Sierra de Cajalbana, northwestern Cuba. It is readily distinguished from Rivulus cylindraceus Poey by the combination of an exclusive color pattern and meristic characters such as a d-type frontal scalation pattern (versus e-type pattern in Rivulus cylindraceus). The current diagnosis of Rivulus berovidesi based on chromatic, morphological and meristic characters is consistent with a recent molecular analysis of this genus in Cuba.

  15. [Growth and mortality of the fish Haemulon aurolineatum (Teleostei: Haemulidae) from southwest of Margarita Island, Venezuela].

    Science.gov (United States)

    Bravo, Edwis; Eslava, Nora; González, Leo

    2009-01-01

    We analyzed the growth and natural mortality of the fish known locally as cuji (H. aurolineatum) in the southwest of Margarita Island, July 2005 to June 2006. A sample of 1,378 males and 1,143 females from artisanal fishing vessels of Boca del Río was analyzed. The common relation for both sexes was expressed by the equation P=0.038*L(2.87). The asymptotic length (L(infinity)) was estimated with Powell's (1979) routine and Wetherall (1986), and the growth coefficient (k) with ELEFAN I - FISAT II (FAO-ICLARM). The modal progression analysis was used after decomposition of lengths frequency according to Bhattacharya, and the estimations of L(infinity), and k optimized according to Gulland and Holt (1959). The growth curve was fitted to von Bertalanffy (1960); it is exponential, with accelerated growth in the first two years and less growth as the fish approaches maximal length. The rate of natural mortality was high (M=1.15 year(-1)), and probably was caused by high depredation.

  16. Cytogenetic analysis of three species of the genus Haemulon (Teleostei: Haemulinae) from Margarita Island, Venezuela.

    Science.gov (United States)

    Nirchio, Mauro; Gaviria, Juan I; Oliveira, Claudio; Ferreira, Irani Alves; Martins, Cesar

    2007-10-01

    This paper describes the karyotype analysis of Haemulon aurolineatum, Haemulon bonariensis and Haemulon plumierii, by Giemsa staining, C-banding, Ag-staining and fluorescent in situ hybridization (FISH), to locate the 18S and 5S rRNA genes. Diploid modal count in the three species was 2n = 48 acrocentric elements. Except for pair 24, which exhibited an unmistakable secondary constriction in all three species, it was not possible to classify them as homologous to each other because differences in chromosome size were too slight between adjacent pairs within a size-graded series. Ag-NOR clusters were located in pair 24 in the three species with signal located on the secondary constriction of these chromosomes. C-banding demonstrated that the three species share the same distribution pattern of the constitutive heterochromatin with centromeric heterochromatic blocks in the 23 chromosome pairs and a pericentromeric block in pair 24 which is coincident with the NORs. FISH experiments showed that 18S rDNA sequences were located coincident with the Ag-NOR site in the three species; however, differences in both the number and chromosome distribution of 5S-rDNA cluster were detected among them. Our data suggest that chromosome evolution of Haemulon has been preserved from major changes in the karyotypic macrostructure, whereas microstructural changes have occurred.

  17. Etologia social e endocrinologia comportamental da tilapia oreochromis mossambicus (teleostei, cichlidae)

    OpenAIRE

    Oliveira, Rui Filipe

    1995-01-01

    Tese de Doutoramento apresentada à Faculdade de Ciências, Universidade de Lisboa Com a presente dissertação pretende-se estudar os aspectos funcionais e causais envolvidos no comportamento social dos Ciclídeos africanos incubadores bucais, sobretudo no que diz respeito às interacções entre as hormonas e o comportamento, e ao seu significado funcional, tendo sido escolhida como modelo para estudo a Tilápia de Moçambique Oreochromis mossambicus (Peters 1852). Nesta perspectiva, a presente di...

  18. Peroxisomes in intestinal and gallbladder epithelial cells of the stickleback, Gasterosteus aculeatus L. (Teleostei)

    NARCIS (Netherlands)

    Ruiter, A.J.H. de; Veenhuis, M.; Wendelaar Bonga, S.E.

    1988-01-01

    The occurrence of microbodies in the epithelial cells of the intestine and gallbladder of the stickleback, Gasterosteus aculeatus L., is described. In the intestine the organelles are predominantly located in the apical and perinuclear zone of the cells and may contain small crystalline cores. In

  19. Clave ilustrada de los peces chilenos de la familia Serranidae (Teleostei: Perciformes

    Directory of Open Access Journals (Sweden)

    Germán Pequeño

    2011-03-01

    Full Text Available Se presenta una clave para reconocer especies de la familia Serranidae de Chile, que se agrupan en las subfamilias Epinephelinae, Serraninae y Anthiinae. Se proporcionan antecedentes básicos referidos a la taxonomía del grupo, para mayor facilidad del reconocimiento. En cada caso específico, se indica la distribución geográfica e ilustraciones reducidas de las 13 especies de la familia Serranidae que en la actualidad son consideradas en la ictiofauna de Chile.

  20. The oldest fossil cichlids (Teleostei: Perciformes): indication of a 45 million-year-old species flock.

    Science.gov (United States)

    Murray, A. M.

    2001-01-01

    Five closely related species of fossil cichlids collected from an Eocene site in Tanzania, East Africa, represent the oldest known cichlids. The specimens are whole-body, articulated fishes that are extremely well preserved and, therefore, have the potential to add to our knowledge of the history of this family. Modern cichlids are particularly well known for the numerous species flocks of the East African Great Lakes. A great deal of research is ongoing regarding all aspects of the fishes in these flocks, including their evolutionary history The new collection of fossils reported here is interpreted as representing a species flock that arose in a small crater lake. These fossils indicate that cichlids' ability to form species flocks evolved early in the history of this family. PMID:11321055

  1. World-wide species distributions in the family Kyphosidae (Teleostei: Perciformes).

    Science.gov (United States)

    Knudsen, Steen Wilhelm; Clements, Kendall D

    2016-08-01

    Sea chubs of the family Kyphosidae are major consumers of macroalgae on both temperate and tropical reefs, where they can comprise a significant proportion of fish biomass. However, the relationships and taxonomic status of sea chubs (including the junior synonyms Hermosilla, Kyphosus, Neoscorpis and Sectator) worldwide have long been problematical due to perceived lack of character differentiation, complicating ecological assessment. More recently, the situation has been further complicated by publication of conflicting taxonomic treatments. Here, we resolve the relationships, taxonomy and distribution of all known species of sea chubs through a combined analysis of partial fragments from mitochondrial markers (12s, 16s, cytb, tRNA -Pro, -Phe, -Thr and -Val) and three nuclear markers (rag1, rag2, tmo4c4). These new results provide independent evidence for the presence of several junior synonyms among Atlantic and Indo-Pacific taxa, demonstrating that several sea chub species are more widespread than previously thought. In particular, our results can reject the hypothesis of endemic species in the Atlantic Ocean. At a higher taxonomic level, our results shed light on the relationships between Girellidae, Kuhliidae, Kyphosidae, Microcanthidae, Oplegnathidae and Scorpididae, with Scorpididae resolved as the sister group to Kyphosidae. Copyright © 2016 Elsevier Inc. All rights reserved.

  2. Taxonomic revision and stratigraphic provenance of 'Histiophorus rotundu' Woodward 1901 (Teleostei, Perciformes)

    Science.gov (United States)

    Monsch, K.A.; Fierstine, H.L.; Weems, R.E.

    2005-01-01

    Until recently, Histiophorus rotundus Woodward 1901, was known from a single, poorly preserved rostrum from the Tertiary phosphate beds near Charleston, South Carolina, an area from which many fossils have been described. The specimen is relatively featureless externally; its internal anatomy is unknown and the documentation of its geological provenance was poor. In an earlier revision the species was transferred to the fossil billfish genus Xiphiorhynchus Van Beneden, 1871. Here we confirm this designation, supported by new morphological studies of the holotype, recently found specimens of Xiphiorhynchus rotundus (Woodward, 1901), and the stratigraphic record of Xiphiorhynchus. The systematic paleontology we present is a contribution to the taxonomic revision of billfishes world-wide. Because the holotype is heavily phosphatized and the type locality was vaguely described, we discuss the geology of the phosphate mining districts of the Charleston region. Based on our studies, we can narrow the possible age of the holotype to late Oligocene or early Miocene. We suggest X. rotundus was extinct by the Burdigalian. 

  3. Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae

    Directory of Open Access Journals (Sweden)

    Júlia Giora

    2009-06-01

    Full Text Available This study described the reproductive biology of a population of the weakly electric fish Eigenmannia trilineata from southern Brazil, providing the information on the estimation of reproductive period, fecundity, spawning type, first maturation size, and analysis of gonadal morphology and histology of the species, relating these data to alimentary and abiotic characters. The species showed a relatively long reproductive period, a relative fecundity of 0.27 oocytes per mg of total weight and a parcelled spawning type. First maturation size estimated for the females was 80.5 mm and for the males 63.5 mm of total length. Sex ratio did not differ from 1:1 under a X²test (α= 0.01 during all the sampled months. Sexual dimorphism was related to total length, and males had larger total length than females. The abiotic factors photoperiod and water conductivity presented significant correlations with female GSI, while male GSI presented a significant correlation only with photoperiod.Este trabalho descreve a biologia reprodutiva de uma população do peixe elétrico Eigenmannia trilineata do Sul do Brasil. São apresentadas informações a respeito do período reprodutivo, fecundidade, tipo de desova, tamanho de primeira maturação, morfologia e histologia das gônadas da espécie, relacionando estes dados a caracteres alimentares e abióticos. A espécie apresentou período reprodutivo relativamente longo, com fecundidade relativa de 0,27 ovócito por miligrama do peso da fêmea e desova do tipo parcelada. O tamanho de primeira maturação gonadal estimado para fêmeas foi 80,5 mm e para machos, 63,5 mm de comprimento total. A proporção sexual, testada pelo teste X² (Α= 0.01, foi de 1:1 durante todos os meses amostrados; dimorfismo sexual relacionado ao comprimento total foi detectado, possuindo os machos um maior comprimento total. Dos fatores abióticos testados, fotoperíodo e condutividade da água mostraram correlação significativa com o IGS das fêmeas, enquanto somente fotoperíodo apresentou-se relacionado ao IGS dos machos.

  4. Genus-level taxonomic changes implied by the mitochondrial phylogeny of grey mullets (Teleostei: Mugilidae).

    Science.gov (United States)

    Durand, Jean-Dominique; Chen, Wei-Jen; Shen, Kang-Ning; Fu, Cuizhang; Borsa, Philippe

    2012-01-01

    A comprehensive mitochondrial phylogeny of the family Mugilidae (Durand et al., Mol. Phylogenet. Evol. 64 (2012) 73-92) demonstrated the polyphyly or paraphyly of a proportion of the 20 genera in the family. Based on these results, here we propose a revised classification with 25 genera, including 15 genera currently recognized as valid (Agonostomus, Aldrichetta, Cestraeus, Chaenomugil, Chelon, Crenimugil, Ellochelon, Joturus, Mugil, Myxus, Neomyxus, Oedalechilus, Rhinomugil, Sicamugil and Trachystoma), 7 resurrected genera [Dajaus (for Agonostomus monticola), Gracilimugil (for Liza argentea), Minimugil (for Sicamugil cascasia), Osteomugil (for several species currently under Moolgarda and Valamugil, including M. cunnesius, M. engeli, M. perusii, and V. robustus), Planiliza (for Indo-Pacific Chelon spp., Indo-Pacific Liza spp., and Paramugil parmatus), Plicomugil (for Oedalechilus labiosus), and Squalomugil (for Rhinomugil nasutus)] and 3 new genera: Neochelon gen. nov. (for Liza falcipinnis), Parachelon gen. nov. (for L. grandisquamis) and Pseudomyxus gen. nov. (for Myxus capensis). Genus Chelon was shown to include exclusively Chelon spp. and Liza spp. from the Atlantic and the Mediterranean, and Liza spp. species endemic to eastern southern Africa. Genus Crenimugil should now include C. crenilabis, Moolgarda seheli and V. buchanani. Genus names Liza, Moolgarda, Paramugil, Valamugil and Xenomugil should be abandoned because they are no longer valid. Further genetic evidence is required to confirm or infirm the validity of the genus Paracrenimugil Senou 1988. The mitochondrial phylogeny of the 25 genera from the present revision is the following: [(Sicamugil, (Minimugil, Rhinomugil)); Trachystoma; ((Myxus, Neomyxus), (Cestraeus, Chaenomugil, (Agonostomus, Dajaus, Joturus), Mugil)); (Aldrichetta, Gracilimugil); Neochelon gen. nov.; (Pseudomyxus gen. nov., (Chelon, Oedalechilus, Planiliza, Parachelon gen. nov.)); ((Squalomugil, (Ellochelon, Plicomugil)), (Crenimugil, Osteomugil))]. Agonostomus monticola and several species with large distribution ranges (including Moolgarda seheli, Mugil cephalus and M. curema) consist of separate lineages whose geographic distribution suggests they are cryptic species, thus warranting further taxonomic work in the Mugilidae at the infra-generic level. Copyright © 2012 Académie des sciences. Published by Elsevier SAS. All rights reserved.

  5. The Glyptothorax of the Bolaven Plateau, Laos (Teleostei: Sisoridae): new and endangered.

    Science.gov (United States)

    Ng, Heok Hee; Kottelat, Maurice

    2017-03-05

    Glyptothorax forabilis, new species, and G. porrectus, new species, are described from the Bolaven Plateau in southern Laos. Both species closely resemble G. laosensis, but can be distinguished from it and other Indochinese congeners by combinations of color pattern, morphometry (with particular regards to the eye, body depth, and caudal peduncle) and thoracic adhesive apparatus morphology. Both species are endemic to the Bolaven Plateau, have a very limited distribution and are threatened by hydropower and agricultural activities.

  6. Conhecimento e conservacao dos peixes marinhos e estuarinos (Chondrichthyes e Teleostei) da costa norte do Brasil

    OpenAIRE

    Marceniuk,Alexandre Pires; Caires,Rodrigo Antunes; Wosiacki,Wolmar Benjamin; Dario,Fabio Di

    2013-01-01

    The tropical western South Atlantic, which includes a substantial portion of the Brazilian Exclusive Economic Zone, is a region of endemism broadly recognized as being of prime importance for the conservation of the marine biodiversity. The north coast of Brazil, which comprises the states of Amapá, Pará and Maranhão from the mouth of the rio Oiapoque to the mouth of the rio Parnaíba, harbors the largest continuous mangrove in the world, with approximately 8,900 km2. The h...

  7. Phylogeography and RAPD-PCR variation in Hoplias malabaricus (Bloch, 1794 (Pisces, Teleostei in southeastern Brazil

    Directory of Open Access Journals (Sweden)

    Dergam Jorge A.

    2002-01-01

    Full Text Available In the Rio Doce basin of southeastern Brazil, the freshwater fish Hoplias malabaricus (trahira is a widespread predatory characin and one of the few resilient native fishes in a highly impacted lake system. In order to test for genetic differentiation in populations within this basin and for biogeographic relationships among populations of this species in other basins, a study was conducted using RAPD-PCR analysis of Rio Doce samples (N = 63 and phylogeographic analyses with mitochondrial DNA (mtDNA haplotypes, including the Rio Grande and Macacu river basins. In the Rio Doce basin, the patterns of genetic similarity of RAPD-PCR markers (individual fingerprinting and Nei?s genetic distance suggest the existence of two genetically different groups, one composed of the lacustrine populations Carioca and Dom Helvécio, and the other of riverine and the remaining lacustrine populations. The differences in the RAPD-PCR patterns may be explained by the existence of sub-basins within this lacustrine system. A maximum parsimony tree of cytochrome b fragment (383 base pairs supports the view that trahiras of the Rio Doce share a complex biogeographic history with those of neighboring basins. The phylogeographic patterns may be explained by a common history of the watersheds of the Rio Doce, Paraíba do Sul, and Rio Grande basins, corroborating the hypothesis of a Plio-Pleistocene separation of these drainage systems, forming the Mantiqueira "divortium aquarium".

  8. Un caso de xantismo parcial en Aplodactylus punctatus (Teleostei: Aplodactylidae del sur de Perú

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    Philippe Béarez

    2006-10-01

    Full Text Available Se reporta por primera vez en Ilo, sur del Perú, una jerguilla amarilla (Aplodactylus punctatus. Esa condición de tener una piel de color amarillo se denomina xantismo. Este registro, único, corresponde probablemente a una extensión hacia el norte del rango de distribución de la «jerguilla reina», conocida de la costa central de Chile.

  9. Lycodes adolfi Nielsen and Fosså, 1993 (Teleostei: Zoarcidae) found in the Arctic Ocean

    OpenAIRE

    Byrkjedal, Ingvar; Langhelle, Gunnar; de Lange Wenneck, Thomas; Wienerroither, Rupert

    2010-01-01

    Adolf’s eelpout, Lycodes adolW, was found at Wve bottom trawl stations in 2007–2009, on the slope towards the SoWa Deep north of Spitsbergen, at depths of 970–1,220 m and water temperatures below 0°C. Previously, the species has been known from cold and deep waters south of 74°N to both sides of Greenland and in the Norwegian Sea. The present material represents the Wrst records from the Arctic Ocean and may indicate a wider arctic distribution of this species.

  10. Nuclear DNA content in 20 species of Siluriformes (Teleostei: Ostariophysi from the Neotropical region

    Directory of Open Access Journals (Sweden)

    Paulo César Fenerich

    2004-01-01

    Full Text Available In the present study, 20 species of Siluriformes fish were analyzed in order to determine their nuclear DNA content and compare these data with their diploid number. In addition, the extension and importance of the changes that occurred during the process of diversification in the group of Neotropical freshwater catfish were investigated. The only species studied of the family Doradidae, Rhinodoras d'orbignyi (2n = 58, presented 3.46 ± 0.13 pg of DNA. Among the species of the family Heptapteridae, the values of nuclear DNA content and the diploid numbers ranged from 1.13 ± 0.09 pg of DNA in Pimelodella sp. (2n = 46 to 2.38 ± 0.07 pg of DNA in Imparfinis mirini (2n = 58. The family Loricariidae showed the widest variation in diploid number and nuclear DNA content values, ranging from 2n = 52 and 3.96 ± 0.22 pg of DNA in Liposarcus anisitsi to 2n = 76 and 4.90 ± 0.12 pg of DNA in Hypostomus sp. 4. In this group, two local samples of Pimelodus maculatus (Pimelodidae were analyzed, and both exhibited 2n = 56, but different nuclear DNA content values (2.68 ± 0.22 pg and 2.82 ± 0.20 pg, respectively. Among the Pseudopimelodidae species analyzed, Pseudopimelodus mangurus (2n = 54 showed 2.23 ± 0.15 pg and Microglanis cottoides (2n = 54 exhibited 2.50 ± 0.18 pg of DNA. Two species of Trichomycterus (Trichomycteridae also presented the same diploid number, 2n = 54 chromosomes, but, while the species from the Quinta stream presented a DNA content of 2.62 ± 0.19 pg, in the sample from the Capivara river this value was 2.30 ± 0.23 pg. In the analyzed species, the results showed that the changes in DNA content were frequently not followed by changes in the diploid number. This fact permits to suggest that, in addition to structural chromosome rearrangements, other mechanisms, including deletions, duplications and polyploidy, could be involved in the process of species differentiation in the representatives of the fish order Siluriformes.

  11. A new Pseudophoxinus (Teleostei, Cyprinidae) species from Asi River Drainage (Turkey).

    Science.gov (United States)

    Küçük, Fahrettin; Güçlü, Salim Serkan

    2014-01-01

    Pseudophoxinus turani sp. n. is described from the İncesu Spring (Hassa-Hatay) drainage of Asi River, Turkey. It is distinguished from other Eastern Mediterranean Region Pseudophoxinus species by a combination of characters: lateral line incomplete, with 12-25 (commonly 16-21) perforated scales and 38-46+2-3 scales in lateral series (commonly 41-44+2-3); 10-11 scale rows between the lateral line and dorsal-fin origin; 3-4 scale rows between the lateral line and the pelvic-fin origin; dorsal fin with 7½ branched rays; anal fin commonly with 7½ branched rays; 8-11gill rakers on the first branchial arch; dorsal profile markedly convex with marked hump at the nape, ventral profile less convex than dorsal profile; a small, irregular, black blotch on the base of the caudal fin; mouth terminal, with slightly distinct chin, its corner not reaching vertical through anterior margin of eye; snout somewhat long, with rounded tip; and its length greater than eye diameter.

  12. Nuclear DNA content determination in Characiformes fish (Teleostei, Ostariophysi from the Neotropical region

    Directory of Open Access Journals (Sweden)

    Carvalho Margarida Lima

    2002-01-01

    Full Text Available In the present study, nuclear DNA content was analyzed in 53 species of Characiformes fish from the Neotropical region. Diploid number ranged from 2n = 48 in Astyanax fasciatus, Gymnocorymbus ternetzi and Hyphessobrycon griemi to 2n = 102 in Potamorhina squamoralevis, with a modal number of 54 chromosomes. Nuclear DNA content ranged from 1.70 ± 0.04 pg of DNA per diploid nucleus in Acestrorhynchus pantaneiro to 3.94 ± 0.09 pg in Tetragonopterus chalceus. A general analysis showed a mean value of 2.9 pg of DNA per diploid nucleus. Very similar DNA content values were observed in the species of the family Cynodontidae which showed a variation of 3% between the two genera studied. Small variations were observed between populations of Gymnocorymbus ternetzi, Astyanax fasciatus and Moenkhausia sanctaefilomenae (Characidae, Tetragonopterinae. The subfamilies Tetragonopterinae and Acestrorhynchinae (Characidae presented the widest range, about 96%. Even in those families in which diploid number and karyotypic formulae were conserved such as the families Anostomidae, Curimatidae, and Prochilodontidae, episodes leading to losses or gains of genetic material became fixed in their evolutionary history.

  13. Monophyly of Heterandriini (Teleostei: Poeciliidae revisited: a critical review of the data

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    Alfy Morales-Cazan

    Full Text Available The systematics and taxonomy of poeciliid fishes (guppies and allies remain poorly understood despite the relative importance of these species as model systems in the biological sciences. This study focuses on testing the monophyly of the nominal poeciliine tribe Heterandriini and the genus Heterandria, through examination of the morphological characters on which the current classification is based. These characters include aspects of body shape (morphometrics, scale and fin-ray counts (meristics, pigmentation, the cephalic laterosensory system, and osteological features of the neurocranium, oral jaws and suspensorium, branchial basket, pectoral girdle, and the gonopodium and its supports. A Maximum Parsimony analysis was conducted of 150 characters coded for 56 poeciliid and outgroup species, including 22 of 45 heterandriin species (from the accounted in Parenti & Rauchenberger, 1989, or seven of nine heterandriin species (from the accounted in Lucinda & Reis, 2005. Multistate characters were analyzed as both unordered and ordered, and iterative a posteriori weighting was used to improve tree resolution. Tree topologies obtained from these analyses support the monophyly of the Middle American species of "Heterandria," which based on available phylogenetic information, are herein reassigned to the genus Pseudoxiphophorus. None of the characters used in previous studies to characterize the nominal taxon Heterandriini are found to be unambiguously diagnostic. Some of these characters are shared with species in other poeciliid tribes, and others are reversed within the Heterandriini. These results support the hypothesis that Pseudoxiphophorus is monophyletic, and that this clade is not the closest relative of H. formosa (the type species from southeastern North America. Available morphological data are not sufficient to assess the phylogenetic relationships of H. formosa with respect to other members of the Heterandriini. The results further suggest that most tribe-level taxa of the Poeciliinae are not monophyletic, and that further work remains to resolve the evolutionary relationships of this group.

  14. Uncovering the Ancestry of B Chromosomes in Moenkhausia sanctaefilomenae (Teleostei, Characidae.

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    Ricardo Utsunomia

    Full Text Available B chromosomes constitute a heterogeneous mixture of genomic parasites that are sometimes derived intraspecifically from the standard genome of the host species, but result from interspecific hybridization in other cases. The mode of origin determines the DNA content, with the B chromosomes showing high similarity with the A genome in the first case, but presenting higher similarity with a different species in the second. The characid fish Moenkhausia sanctaefilomenae harbours highly invasive B chromosomes, which are present in all populations analyzed to date in the Parana and Tietê rivers. To investigate the origin of these B chromosomes, we analyzed two natural populations: one carrying B chromosomes and the other lacking them, using a combination of molecular cytogenetic techniques, nucleotide sequence analysis and high-throughput sequencing (Illumina HiSeq2000. Our results showed that i B chromosomes have not yet reached the Paranapanema River basin; ii B chromosomes are mitotically unstable; iii there are two types of B chromosomes, the most frequent of which is lightly C-banded (similar to euchromatin in A chromosomes (B1, while the other is darkly C-banded (heterochromatin-like (B2; iv the two B types contain the same tandem repeat DNA sequences (18S ribosomal DNA, H3 histone genes, MS3 and MS7 satellite DNA, with a higher content of 18S rDNA in the heterochromatic variant; v all of these repetitive DNAs are present together only in the paracentromeric region of autosome pair no. 6, suggesting that the B chromosomes are derived from this A chromosome; vi the two B chromosome variants show MS3 sequences that are highly divergent from each other and from the 0B genome, although the B2-derived sequences exhibit higher similarity with the 0B genome (this suggests an independent origin of the two B variants, with the less frequent, B2 type presumably being younger; and vii the dN/dS ratio for the H3.2 histone gene is almost 4-6 times higher for B chromosomes than for A chromosome sequences, suggesting that purifying selection is relaxed for the DNA sequences located on the B chromosomes, presumably because they are mostly inactive.

  15. Microsatellite Development for an Endangered Bream Megalobrama pellegrini (Teleostei, Cyprinidae Using 454 Sequencing

    Directory of Open Access Journals (Sweden)

    Zuogang Peng

    2012-03-01

    Full Text Available Megalobrama pellegrini is an endemic fish species found in the upper Yangtze River basin in China. This species has become endangered due to the construction of the Three Gorges Dam and overfishing. However, the available genetic data for this species is limited. Here, we developed 26 polymorphic microsatellite markers from the M. pellegrini genome using next-generation sequencing techniques. A total of 257,497 raw reads were obtained from a quarter-plate run on 454 GS-FLX titanium platforms and 49,811 unique sequences were generated with an average length of 404 bp; 24,522 (49.2% sequences contained microsatellite repeats. Of the 53 loci screened, 33 were amplified successfully and 26 were polymorphic. The genetic diversity in M. pellegrini was moderate, with an average of 3.08 alleles per locus, and the mean observed and expected heterozygosity were 0.47 and 0.51, respectively. In addition, we tested cross-species amplification for all 33 loci in four additional breams: M. amblycephala, M. skolkovii, M. terminalis, and Sinibrama wui. The cross-species amplification showed a significant high level of transferability (79%–97%, which might be due to their dramatically close genetic relationships. The polymorphic microsatellites developed in the current study will not only contribute to further conservation genetic studies and parentage analyses of this endangered species, but also facilitate future work on the other closely related species.

  16. Molecular Evidence for Multiple Origins of the European Spined Loaches (Teleostei, Cobitidae)

    Science.gov (United States)

    Perdices, Anabel; Bohlen, Joerg; Šlechtová, Vendula; Doadrio, Ignacio

    2016-01-01

    We present a phylogenetic investigation of the Northern Clade, the major monophyletic clade within the freshwater fish family Cobitidae, one of the most prominent families of freshwater fishes found in Asian and European waters. Phylogenetic reconstructions based on the cytochrome b and RAG-1 genes show the genera Microcobitis, Sabanejewia, Koreocobitis and Kichulchoia as monophyletic groups. These reconstructions also show a Cobitis sensu lato and a Misgurnus sensu lato group. The Cobitis sensu lato group includes all species of Cobitis, Iksookimia, Niwaella and Kichulchoia, while the Misgurnus sensu lato group includes Misgurnus, Paramisgurnus and Koreocobitis. Although the monophyly of both the Cobitis sensu lato and Misgurnus sensu lato groups is supported, relationships within the groups are incongruent with current generic definitions. The absence of monophyly of most genera included in the Cobitis sensu lato group (Cobitis, Iksookimia and Niwaella) or their low genetic differentiation (Kichuchoia) supports their consideration as synonyms of Cobitis. Molecular phylogenies indicate that the Asian species of Misgurnus experienced a mitochondrial introgression from a lineage of Cobitis. We also find two nuclear haplotypes in the same Cobitis species from the Adriatic area that, in the absence of morphological differentiation, may indicate molecular introgression. Most lineages within the Northern Clade consist of species found in East Asia. However, some lineages also contain species from Europe and Asia Minor. The phylogenetic relationships presented here are consistent with previous studies suggesting an East Asian origin of the Northern Clade. According to the current distributions and phylogenetic relationships of the Misgurnus sensu lato and Cobitis clade lineages, particularly of M. fossilis and C. melanoleuca, the range expansion of East Asian species into Europe was most likely via Siberia into Northern and Central Europe. Phylogenetic analyses also show that the Cobitis sensu lato group consists of two clear subgroups (I and II), each presenting geographical differences. Subgroup I is distributed exclusively in East Asian drainages with an Eastern European offshoot (C. melanoleuca), whereas Subgroup II includes species widespread throughout Europe (including the Mediterranean), Asia Minor, the Black Sea and the Caucasus, with some lineages related to species restricted to East Asia. PMID:26727121

  17. Amblyceps accari, a new species of torrent catfish (Teleostei: Amblycipitidae) from the Western Ghats of India.

    Science.gov (United States)

    Dahanukar, Neelesh; Raghavan, Rajeev; Ali, Anvar; Britz, Ralf

    2016-05-06

    A new species of torrent catfish, Amblyceps accari, is described from the central region of the Western Ghats of India. The new species differs from all its congeners by having 12 branched anal-fin rays (vs. 7-10 in other Amblyceps, rarely 11 in A. tuberculatum). It differs further from all other species of the genus except A. murraystuarti and A. torrentis in having the adipose fin confluent with the dorsal procurrent part of the caudal fin and by the following combination of characters from all its congeners: jaws unequal with lower jaw weakly-projecting, pectoral spine smooth, adipose-fin origin opposite anal-fin origin, dorsal fin to adipose-fin distance more than one fourth of standard length, adipose fin long with its base more than one-fourth of standard length, and deeply forked caudal fin with minute, poorly developed, centrally projecting hooks on the proximal lepidotrichia of central caudal-fin rays. The discovery of the new species represents the first record of this genus from peninsular India.

  18. Description of a ZZ/ZW sex chromosome system in Thoracocharax cf. stellatus (Teleostei, Characiformes, Gasteropelecidae

    Directory of Open Access Journals (Sweden)

    Carvalho Margarida Lima

    2002-01-01

    Full Text Available The family Gasteropelecidae is composed of three genera and eight species. This study shows that Thoracocharax cf. stellatus has 2n = 52 chromosomes for both sexes. The five males studied showed 8 metacentric, 16 submetacentric, 4 subtelocentric, and 24 acrocentric chromosomes; the seven females showed only one submetacentric chromosome, belonging to pair 11, and one extra acrocentric chromosome, smaller than all the other chromosomes, characterizing the presence of a ZZ/ZW sex chromosome system in this species. Nucleolus organizing regions (NORs were detected on the short arms of the subtelocentric chromosome pair 13. Constitutive heterochromatin was identified at pericentromeric and terminal positions in almost all chromosomes. The W chromosome was almost entirely heterochromatic, except for a small terminal euchromatic segment. The analyses of the amount of nuclear DNA found 2.18 ± 0.09 pg of DNA per diploid nucleus, without significant differences between sexes. A discussion about the evolution of the sex chromosomes in this group is presented.

  19. The complete mitochondrial genome of the Zig-zag eel Mastacembelus armatus (Teleostei, Mastacembelidae).

    Science.gov (United States)

    Li, Qiang; Xu, Ruilin; Shu, Hu; Chen, Qian; Huang, Jianrong

    2016-01-01

    In this paper, the complete mitochondrial DNA (mtDNA) sequence of Mastacembelus armatus was determined. The mitochondrial genome is 16,486 bp in length, including 13 protein-coding genes, 2 ribosomal RNAs (rRNAs), 22 transfer RNAs (tRNAs) and a noncoding control region as those found in other vertebrates, with the gene identical to that of typical vertebrates. The overall base composition of the heavy strand are 25.28% of A, 29.13% of T, 14.65% of C and 30.93% of G, with a slight AT bias of 54.41%. With the exception of ND6 and eight tRNA genes, all other mitochondrial genes are encoded on the heavy strand.

  20. Roa rumsfeldi, a new butterflyfish (Teleostei, Chaetodontidae) from mesophotic coral ecosystems of the Philippines.

    Science.gov (United States)

    Rocha, Luiz A; Pinheiro, Hudson T; Wandell, Matt; Rocha, Claudia R; Shepherd, Bart

    2017-01-01

    A new species of the butterflyfish genus Roa is herein described from the Verde Island Passage in the Philippines, West Pacific Ocean. Roa rumsfeldisp. n. was found on mesophotic coral ecosystems at Puerto Galera and Batangas, and sampled through technical mixed-gas rebreather diving at 100-130 m depth. This represents the fifth known species of Roa. The main differences between Roa rumsfeldisp. n. and its congeners are the lower number of pored scales in the lateral line, longer snout, longer caudal peduncle, shorter caudal fin, pelvic fin color (dark first spine vs. white in all other Roa), and genetics (8.4% divergence from its closest relative Roa modesta in the mitochondrial COI gene). Roa spp. are usually seen in pairs, but the two specimens we collected were solitary individuals. We have kept one of the specimens alive in the California Academy of Sciences' Twilight Zone exhibit for more than one year, where it thrives and is feeding on a variety of dried and fresh food.

  1. Uncovering the Ancestry of B Chromosomes in Moenkhausia sanctaefilomenae (Teleostei, Characidae).

    Science.gov (United States)

    Utsunomia, Ricardo; Silva, Duílio Mazzoni Zerbinato de Andrade; Ruiz-Ruano, Francisco J; Araya-Jaime, Cristian; Pansonato-Alves, José Carlos; Scacchetti, Priscilla Cardim; Hashimoto, Diogo Teruo; Oliveira, Claudio; Trifonov, Vladmir A; Porto-Foresti, Fábio; Camacho, Juan Pedro M; Foresti, Fausto

    2016-01-01

    B chromosomes constitute a heterogeneous mixture of genomic parasites that are sometimes derived intraspecifically from the standard genome of the host species, but result from interspecific hybridization in other cases. The mode of origin determines the DNA content, with the B chromosomes showing high similarity with the A genome in the first case, but presenting higher similarity with a different species in the second. The characid fish Moenkhausia sanctaefilomenae harbours highly invasive B chromosomes, which are present in all populations analyzed to date in the Parana and Tietê rivers. To investigate the origin of these B chromosomes, we analyzed two natural populations: one carrying B chromosomes and the other lacking them, using a combination of molecular cytogenetic techniques, nucleotide sequence analysis and high-throughput sequencing (Illumina HiSeq2000). Our results showed that i) B chromosomes have not yet reached the Paranapanema River basin; ii) B chromosomes are mitotically unstable; iii) there are two types of B chromosomes, the most frequent of which is lightly C-banded (similar to euchromatin in A chromosomes) (B1), while the other is darkly C-banded (heterochromatin-like) (B2); iv) the two B types contain the same tandem repeat DNA sequences (18S ribosomal DNA, H3 histone genes, MS3 and MS7 satellite DNA), with a higher content of 18S rDNA in the heterochromatic variant; v) all of these repetitive DNAs are present together only in the paracentromeric region of autosome pair no. 6, suggesting that the B chromosomes are derived from this A chromosome; vi) the two B chromosome variants show MS3 sequences that are highly divergent from each other and from the 0B genome, although the B2-derived sequences exhibit higher similarity with the 0B genome (this suggests an independent origin of the two B variants, with the less frequent, B2 type presumably being younger); and vii) the dN/dS ratio for the H3.2 histone gene is almost 4-6 times higher for B chromosomes than for A chromosome sequences, suggesting that purifying selection is relaxed for the DNA sequences located on the B chromosomes, presumably because they are mostly inactive.

  2. Infection of the heart of Pimelodus ornatus (Teleostei, Pimelodidae, by Myxobolus sp. (Myxozoa, Myxobolidae

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    Edilson Matos

    2014-12-01

    Full Text Available The phylum Myxozoa Grassé, 1970, consists of a heterogenous group of around 50 genera that are worldwide disseminated in a wide variety of aquatic media. In the present study, 43 specimens of Pimelodus ornatus were collected from an adjacent area to the Cachoeira do Arari municipality on Marajó Island, in the Brazilian state of Pará, in 2013. Macroscopic analysis showed the presence of whitened plasmodia located in the cardiac muscle and also in the region between the bulbus arteriosus and atrium cordis. Microscopic analysis on the parasitized tissues revealed spores that were typically piriform, with the anterior portion slightly narrower than the posterior end. The spore valves were symmetrical. The present species is placed in the genus Myxobolus Butschli, 1882, because of the presence of a pair of equal polar capsules in each spore. The prevalence of parasitism observed was 13.9% (6/43. This research note reports the first occurrence of Myxobolus as a parasite of the heart in the teleostean fish P. ornatus in the Amazon region and confirms the occurrence of secondary myocarditis in this fish, caused by parasitism by Myxobolus sp. The rarity of this parasitic species of Myxobolus at this tissue site, associated with other spore morphology characteristics in the fish, suggests that it is an undescribed species.

  3. Organization of the ampullary organs of the African knife fish Xenomystus nigri (Teleostei: Notopteridae).

    Science.gov (United States)

    Jørgensen, J M; Bullock, T H

    1987-06-01

    Ampullary organs are found on the head and body of the African knife fish Xenomystus nigri. Each organ consists of a duct connecting the basally located sensory cells with the surrounding water. The sensory epithelium is found in a chamber situated in the basal part of the epidermis, which most often is somewhat depressed into the dermis. Each organ contains four to eight sensory cells separated from each other by supporting cells. Both sensory and supporting cells are surrounded by mantle cells. Apically, the pear-shaped sensory cells have a tuft of 40 to 60 microvilli and between these a short cilium; basally they are innervated by one large afferent nerve ending. No efferent endings have been observed.

  4. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Teleostei, Serranidae)

    National Research Council Canada - National Science Library

    Shimada Borges, Joao Carlos; Gomes Sanches, Eduardo; Silva de Oliveira, Marcos; Machado Cunha da Silva, Jose Roberto

    2010-01-01

    .... A investigacao da morfologia do trato digestorio, associada a atividade alimentar, e fundamental para a compreensao da biologia dessa especie e premissa basica para pesquisas sobre requerimentos...

  5. Development of free neuromasts in Engraulis ringens and Strangomera bentincki (Teleostei, Clupeiformes early larvae

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    Alejandra Llanos-Rivera

    2014-03-01

    Full Text Available Neuromast morphology and distribution are characterized during early ontogeny of anchoveta (Engraulis ringens and common sardine (Strangomera bentincki. Although both species share morphological features, they show several differences during their early ontogeny, such as size at hatching and yolk absorption. Larvae were obtained from incubation of planktonic eggs (at 12°C, collected during the spawning season 2001 (August-September at Coliumo Bay. The neuromasts were observed from hatching to 25 days, and the pattern of neuromast appearance, in newly hatched larva, until yolk absorption, was determined using Janus Green staining and scanning electronic microscope. Results showed a similar pattern of neuromast development in both species. At hatching, two pairs of neuromasts were observed in the cephalic area and 8-9 in the rest of the body, which increased to 19 pairs and to 30-39 pairs at a larval size of 11 mm, respectively. On the average, 12 hair cells per neuromast were counted, with little variation among neuromasts. The polarity of these hair cells was closest to multiple polarity. Neuromast positioning for both species, anchoveta and common sardine larvae, are similar to those of Engraulis mordax and Clupea harengus, respectively. The similar development pattern of these species seems to be related to similar functional constraints and close taxonomic affinity.

  6. Discovering Hidden Diversity of Characins (Teleostei: Characiformes) in Ecuador's Yasuní National Park

    National Research Council Canada - National Science Library

    Escobar-Camacho, Daniel; Barriga, Ramiro; Ron, Santiago R

    2015-01-01

    .... The Yasuní National Park is one of the most diverse regions on Earth and recent studies of terrestrial vertebrates, based on genetic evidence, have shown high levels of cryptic and undescribed diversity...

  7. Gaidropsarus (Gadidae, Teleostei) of the North Atlantic Ocean: a brief phylogenetic review.

    Science.gov (United States)

    Francisco, S M; Robalo, J I; Stefanni, S; Levy, A; Almada, V C

    2014-08-01

    The phylogenetic relationships among the North Atlantic Gaidropsarus and between the three Gaidropsarinae genera Gaidropsarus, Ciliata and Enchelyopus are reviewed with the hitherto most comprehensive taxonomic sampling of this group. Phylogenetic results (maximum parsimony, maximum likelihood and Bayesian inference) based on nuclear (rhodopsin) and concatenated mitochondrial (12s, 16s and cytb) markers clearly support this subfamily. For the north-eastern Atlantic species of Gaidropsarus, two previously unreported clades were strongly supported, clarifying the relationships within the genus, and revealing fewer distinct taxa in the north Atlantic Gaidropsarus than previously stipulated. The data challenge the specific status of Gaidropsarus mediterraneus and Gaidropsarus guttatus and raise doubts concerning the distinctiveness of other species. A taxonomic revision of the genus is suggested. © 2014 The Fisheries Society of the British Isles.

  8. Mitochondrial molecular clocks and the origin of the major Otocephalan clades (Pisces: Teleostei)

    DEFF Research Database (Denmark)

    Peng, Zuogang; He, Shunping; Wang, Jun

    2006-01-01

    The Otocephala, a clade including ostariophysan and clupeomorph teleosts, represents about a quarter of total fish species diversity, with about 1000 genera and more than 7000 species. A series of recent papers have defended that the origin of this clade and of its major groups may be significantly....... The present study is thus, among the studies dealing with molecular divergence times of teleosts, the one in which a greater number of otocephalan species are included. The divergence times obtained support that the major otocephalan groups had a much older origin than the oldest fossil records available...

  9. Identification and chromosome mapping of repetitive elements in the Astyanax scabripinnis (Teleostei: Characidae) species complex.

    Science.gov (United States)

    Barbosa, Patrícia; de Oliveira, Luiz Antonio; Pucci, Marcela Baer; Santos, Mateus Henrique; Moreira-Filho, Orlando; Vicari, Marcelo Ricardo; Nogaroto, Viviane; de Almeida, Mara Cristina; Artoni, Roberto Ferreira

    2015-02-01

    Most part of the eukaryotic genome is composed of repeated sequences or multiple copies of DNA, which were considered as "junk DNA", and may be associated to the heterochromatin. In this study, three populations of Astyanax aff. scabripinnis from Brazilian rivers of Guaratinguetá and Pindamonhangaba (São Paulo) and a population from Maringá (Paraná) were analyzed concerning the localization of the nucleolar organizer regions (Ag-NORs), the As51 satellite DNA, the 18S ribosomal DNA (rDNA), and the 5S rDNA. Repeated sequences were also isolated and identified by the Cot - 1 method, which indicated similarity (90%) with the LINE UnaL2 retrotransposon. The fluorescence in situ hybridization (FISH) showed the retrotransposon dispersed and more concentrated markers in centromeric and telomeric chromosomal regions. These sequences were co-localized and interspaced with 18S and 5S rDNA and As51, confirmed by fiber-FISH essay. The B chromosome found in these populations pointed to a conspicuous hybridization with LINE probe, which is also co-located in As51 sequences. The NORs were active at unique sites of a homologous pair in the three populations. There were no evidences that transposable elements and repetitive DNA had influence in the transcriptional regulation of ribosomal genes in our analyses.

  10. Roa rumsfeldi, a new butterflyfish (Teleostei, Chaetodontidae from mesophotic coral ecosystems of the Philippines

    Directory of Open Access Journals (Sweden)

    Luiz A. Rocha

    2017-10-01

    Full Text Available A new species of the butterflyfish genus Roa is herein described from the Verde Island Passage in the Philippines, West Pacific Ocean. Roa rumsfeldi sp. n. was found on mesophotic coral ecosystems at Puerto Galera and Batangas, and sampled through technical mixed-gas rebreather diving at 100–130 m depth. This represents the fifth known species of Roa. The main differences between Roa rumsfeldi sp. n. and its congeners are the lower number of pored scales in the lateral line, longer snout, longer caudal peduncle, shorter caudal fin, pelvic fin color (dark first spine vs. white in all other Roa, and genetics (8.4% divergence from its closest relative Roa modesta in the mitochondrial COI gene. Roa spp. are usually seen in pairs, but the two specimens we collected were solitary individuals. We have kept one of the specimens alive in the California Academy of Sciences’ Twilight Zone exhibit for more than one year, where it thrives and is feeding on a variety of dried and fresh food.

  11. Spontaneous behavior of basal Copionodontinae cave catfishes from Brazil (Teleostei, Siluriformes, Trichomycteridae

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    Bianca Rantin

    2015-08-01

    Full Text Available Cave animals are particularly interesting due to their behavioral specializations, resultant from evolution in isolation. We present data from a spontaneous behavior study (spatial distribution and preference for microhabitats of two troglobitic catfish from Brazil: Glaphyropoma spinosum and a new species of Copionodon. We compared the data with those obtained of a sympatric epigean species, Copionodon pecten. These Trichomycteridae species belong to a basal and apparently monophyletic subfamily – Copionodontinae, endemic to Chapada Diamantina, central Bahia state, eastern Brazil. We observed the fishes in natural and laboratory conditions through ad libitum and focal animal methods. Each spatial behavioral category (hidden, bottom, midwater, surface and wall swimming and stationary in the bottom was timed individually, with a sample of 12 specimens per species. Unlike most troglobitic fishes, cave copionodontines tested herein did not extend exploratory behavior to midwater, with benthonic and thigmotactic-related exploratory behavior. This behavior is possibly related to its feeding behavior specializations, strong territorialism and photophobic behavior. The epigean Copionodon species is also benthonic. The spatial behavior of the cave Copionodontinae could be interpreted as a retained and plesiomorphic character-state in relation to other trichomycterid catfishes.

  12. Stages in the early and larval development of the African catfish Clarias gariepinus (Teleostei, Clariidae).

    Science.gov (United States)

    Olaniyi, Wasiu Adekunle; Omitogun, Ofelia Galman

    2014-08-01

    The African catfish Clarias gariepinus Burchell 1822 is a favourite aquaculture fish in many parts of Africa and Asia because of its hardiness and fast growth rate. In this study, early, post-embryonic and larval developmental stages of C. gariepinus were examined chronologically and described. Photomicrographs of unfertilized matured oocytes from 0 min of fertilization through all cell stages to alevin, to complete yolk absorption, to free swimming larval stages are shown and documented live from lateral and top views, with the aid of a light microscope. Extruded oocytes had a mean diameter of 1 ± 0.1 mm, and possessed a thin perivitelline membrane whose space was filled with a protoplasmic layer. Heartbeat was in the range of 115-160/min prior to hatching. Hatchability rate was 85% and hatching occurred at 17 h at a controlled temperature of 28.5 ± 0.5°C, while ontogeny of the eyes and other organs were discernible. At day 4, larvae mean length was 9.3 ± 0.5 mm, exogenous feeding had commenced fully and melanophores spread cephalocaudally but were concentrated significantly on the head parts. This paper, for the first time, presents the significant chronological developmental stages of C. gariepinus embryology that will have significant implications for genetic manipulation and catfish seed production for aquaculture.

  13. Revisão taxonômica do gênero Homodiaetus (Teleostei, Siluriformes, Trichomycteridae

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    Koch Walter Rudolf

    2002-01-01

    Full Text Available The genus Homodiaetus Eigenmann & Ward, 1907 is revised and four species are recognized. Its distribution is restricted to southeastern South America, from Uruguay to Paraguay river at west to the coastal drainages of Rio de Janeiro State, Brazil. Homodiaetus is currently distinguished from other genus of Stegophilinae by the combination of the following characters: origin of ventral-fin at midlength between the snout tip and the caudal-fin origin; opercle with three or more odontodes; and gill membranes confluent with the istmus. Homodiaetus anisitsi Eigenmann & Ward, 1907, is diagnosed by the caudal-fin with black middle rays, margin of upper and lower procurrent caudal-fin rays with dark stripes extending to the caudal-fin, and 3-6 opercular odontodes; H. passarellii (Ribeiro, 1944 with 6-7 opercular odontodes, 21-24 lower procurrent caudal-fin rays and 23-26 upper procurrent caudal-fin rays; H. banguela sp. nov. with 9 opercular odontodes, 17-19 lower procurrent caudal-fin rays, 17-22 upper procurrent caudal-fin rays, reduction of fourth pharyngobranchial with only three teeth and untoothed fifth ceratobranchial; and H. graciosa sp. nov. with 5-6 dentary rows, 7-9 opercular odontodes and 16-23 upper procurrent caudal-fin rays.

  14. Molecular Evidence for Multiple Origins of the European Spined Loaches (Teleostei, Cobitidae.

    Directory of Open Access Journals (Sweden)

    Anabel Perdices

    Full Text Available We present a phylogenetic investigation of the Northern Clade, the major monophyletic clade within the freshwater fish family Cobitidae, one of the most prominent families of freshwater fishes found in Asian and European waters. Phylogenetic reconstructions based on the cytochrome b and RAG-1 genes show the genera Microcobitis, Sabanejewia, Koreocobitis and Kichulchoia as monophyletic groups. These reconstructions also show a Cobitis sensu lato and a Misgurnus sensu lato group. The Cobitis sensu lato group includes all species of Cobitis, Iksookimia, Niwaella and Kichulchoia, while the Misgurnus sensu lato group includes Misgurnus, Paramisgurnus and Koreocobitis. Although the monophyly of both the Cobitis sensu lato and Misgurnus sensu lato groups is supported, relationships within the groups are incongruent with current generic definitions. The absence of monophyly of most genera included in the Cobitis sensu lato group (Cobitis, Iksookimia and Niwaella or their low genetic differentiation (Kichuchoia supports their consideration as synonyms of Cobitis. Molecular phylogenies indicate that the Asian species of Misgurnus experienced a mitochondrial introgression from a lineage of Cobitis. We also find two nuclear haplotypes in the same Cobitis species from the Adriatic area that, in the absence of morphological differentiation, may indicate molecular introgression. Most lineages within the Northern Clade consist of species found in East Asia. However, some lineages also contain species from Europe and Asia Minor. The phylogenetic relationships presented here are consistent with previous studies suggesting an East Asian origin of the Northern Clade. According to the current distributions and phylogenetic relationships of the Misgurnus sensu lato and Cobitis clade lineages, particularly of M. fossilis and C. melanoleuca, the range expansion of East Asian species into Europe was most likely via Siberia into Northern and Central Europe. Phylogenetic analyses also show that the Cobitis sensu lato group consists of two clear subgroups (I and II, each presenting geographical differences. Subgroup I is distributed exclusively in East Asian drainages with an Eastern European offshoot (C. melanoleuca, whereas Subgroup II includes species widespread throughout Europe (including the Mediterranean, Asia Minor, the Black Sea and the Caucasus, with some lineages related to species restricted to East Asia.

  15. Preliminary observations on the feeding habits of the Mediterranean needlefish Tylosurus acus imperialis (Teleostei: Belonidae

    Directory of Open Access Journals (Sweden)

    Manel Châari

    2016-06-01

    Full Text Available Objective: To present the first information on the feeding habits of the Mediterranean needlefish Tylosurus acus imperialis (T. a. imperialis of Tunisia and to examine the diet variation in relation to the fish size, maturity and sex. Methods: Gut contents of 92 specimens of T. a. imperialis, collected mainly from May 2004 to July 2006 off the Gulf of Gabès, Southeastern Tunisian coast, were analyzed. Results: The results showed that 55.4% of them had empty guts and 44.6% contained food in their guts. The emptiness index did not vary significantly according to size classes or sexes of T. a. imperialis. Basic food consisted of teleosts (Mugilidae, Gobidae and Belonidae (62.6% followed by crustaceans (37.3%, mostly decapods Sycionia carinata (5.4%. A decrease in the feeding rate at the peak of the spawning season was observed for both sexes. A diet variation among juvenile and adult specimens of T. a. imperialis was found. Conclusions: This study enhances our knowledge on the biology of the Mediterranean needlefish T. a. imperialis. This fish is an active predator and an opportunistic feeder but the feeding rate declines at the peak of the spawning season.

  16. The diversity of chromosome structure of males in Cobitis (Teleostei, Cobitidae populations

    Directory of Open Access Journals (Sweden)

    Alicja Boron

    2015-10-01

    Full Text Available The populations of Cobitis distributed in Poland are usually composed of the spined loach C. taenia Linnaeus, 1758 (2n=48 or the danubian loach C. elongatoides Bacescu & Maier, 1969 (2n=50, triploid hybrid females (3n=73, 3n=74, 3n=75 and tetraploid (4n=98, 4n=99 hybrids of both sexes. The results of our experimental studies reveal that c. 60% of eggs of allotriploid females dominating in these populations may be fertilized by C. taenia males whereas the tetraploid Cobitis males are sterile. The aim of this study was to show the chromosome structure of diploid and polyploid Cobitis males distributed in diploid and diploid-polyploid populations in Polish water bodies. Chromosomes of C. taenia and C. elongatoides males (each of 10 individuals and of tetraploid Cobitis males (12 individuals were examined using double-colour fluorescence in situ hybridisation (FISH with 28S and 5S rDNA probes. In the karyotype of C. taenia and C. elongatoides respectively the modal number of nine and six, and seven and two, respectively of 28S rDNA and 5S rDNA sites were detected. C. taenia and C. elongatoides characterized respectively by four and two chromosomes containing hybridization sites of both rDNA probes (co-localizations. The chromosome sets of 4n males were composed of the C. taenia, C. elongatoides and C. tanaitica genomes. The pattern of rDNA sites distribution indicated that apart others the karyotypes of 4n males were composed of one or two haploid chromosome set of C. elongatoides. The presented data give an important insight into the structure of chromosomes of two Cobitis species and into the genome structure of allotetraploid Cobitis males. The obtained result is discussed with previously published studies.

  17. Effects of temperature and salinity on resting metabolism in two ...

    African Journals Online (AJOL)

    Effects of temperature and salinity on resting metabolism in two South African rock pool fish: the resident gobiid Caffrogobius caffer and the transient sparid Diplodus sargus ... A significant positive relationship (P =0.03) between salinity and oxygen consumption was determined for D. sargus capensis, but not for C. caffer.

  18. Ultraestrutura da espermatogênese do tamoatá, Hoplosternum littorale (Hancock (Teleostei, Callichthyidae do rio Amazonas Ultrastructure of the spermatogenesis of the fish, Hoplosternum littorale (Hancock (Teleostei, Callichthyidae of the Amazon river

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    E Matos

    1993-01-01

    Full Text Available Sequential cytological modifications of Hoplosternum littorale (Hancock spermatogenesis were studied with electron microscopy from the spermatocyte to the mature spermatozoon. Five stages of spermatical maturation were described. The spermatozoon is one of the primitive tupe, with head without acrosome and a tail with a type pattern.

  19. Aspectos biológicos del pleco invasor Pterygoplichthys pardalis (Teleostei: Loricariidae en el río Palizada, Campeche, México Biological aspects of the invasor plecos Pterygoplichthys pardalis (Teleostei: Loricariidae from Palizada River, Campeche, Mexico

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    Armando T. Wakida-Kusunoki

    2011-09-01

    Full Text Available Se analizó el comportamiento de la abundancia, la relación peso-longitud y el índice gonadosomático de Pterygoplichthys pardalis en el río Palizada en Campeche, México. Se realizaron muestreos mensuales de junio de 2008 a mayo de 2009 con redes agalleras. Se colectaron 118 plecos cuyas tallas estuvieron entre 222 y 422.5 mm de longitud total (LT y un peso de 72.8 a 385.4 g. El periodo de mayor abundancia se presentó de junio a agosto, no hubo diferencias significativas de la abundancia en diferentes periodos del día (p≤ 0.05. Se observó que el índice de abundancia está correlacionado con el nivel del río y el índice gonadosomático. El índice gonadosomático muestra que la época de reproducción se presenta de mayo a agosto; sin embargo, se encontraron hembras con gónadas bien desarrolladas durante todo el año de muestreo. Los parámetros de la relación peso-longitud para ambos sexos son: b= 2.78 y a= 0.0003. La comparación de esta relación entre ambos sexos no resultó significativa (p≤ 0.05. Es necesario realizar esfuerzos para la erradicación de este pez por medio de incentivos a pescadores durante el periodo de mayor vulnerabilidad y de mayor actividad reproductiva.Abundance, length-weight relationship and gonad somatic index of Pterygoplichthys pardalis in Palizada River, Mexico were analyzed. Monthly samplings were carried out from June 2008 to May 2009 with gill nets. A total of 118 plecos were catched; theirs sizes were between 222 and 422.5 mm of total longitude (TL and weight between 72.8 to 385.4 g. The highest abundance period was found from June to August, with not statistical differences between their values in the different periods of the day (p≤ 0.05. The abundance index was correlationed with river level and gonad somatic index. The gonad somatic index showed that the spawning season occurs from May to August; however, females with well developed gonads were observed during all sampling period. The parameters of the length-weight relationship for both sexes are: b= 2.78 and a= 0.0003. The comparison of this relationship between both sexes is not significant (p≤ 0.05. It is necessary that efforts be made to eradicate this species through incentives to fishermen during bigger vulnerability and of more reproductive activity period.

  20. Condição reprodutiva da betara preta, Menticirrhus americanus (Teleostei, Sciaenidae, na pesca realizada no litoral norte de Santa Catarina, Brasil = Reproductive status of Menticirrhus americanus (Teleostei, Sciaenidae in fisheries performed on the Southern coast of Brazil

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    Elneison da Rosa Muniz

    2008-10-01

    Full Text Available No litoral brasileiro, a legislação costuma regular as práticas pesqueiras segundo o ciclo de vida das espécies-alvo, mas o fato deste não ser coincidente entre as espécies dominantesnas capturas dificulta o manejo em pescarias multiespecíficas. No litoral de Santa Catarina, o defeso aplica-se apenas à pesca de arrasto, e para tal considera o período reprodutivo do camarãosete-barbas, Xyphopenaeus kroyeri. O presente trabalho investiga a incidência da atividade pesqueira sobre indivíduos em reprodução da betara preta, Menticirrhus americanus, espécie comercialmenteapreciada e frequente nas pescarias. As amostragens ocorreram em 2006 e 2007, em desembarques do município de Itapoá, norte do Estado (26°00’S; 48°36’W. Calcularam-se os valores de proporção sexual, frequência de estádios de maturação, índice gonadossomático etamanho de primeira maturação, e relacionou-se a captura de indivíduos em reprodução com a época do ano e a arte de pesca utilizada. Concluiu-se que a atividade pesqueira incide sobre umaparcela populacional que compreende indivíduos em atividade reprodutiva durante, ao menos, duas estações do ano. Há diferenças entre as artes de pesca: a de arrasto não atinge indivíduos emreprodução; a de caceio atua majoritariamente sobre jovens e em maturação; e a de fundeio, principalmente sobre indivíduos em atividade reprodutiva, sobretudo na primavera e no verão.Fisheries rules usually take into account the life cycle of target species. But as these species differ, multi-specific fisheries provedifficult to be managed. In the southern coast of Brazil (26°00’S, 48°36’W, an annual closed fishing season is exclusive to trawling only, which target species such as the shrimp Xyphopenaeuskroyeri. In this region, the consequences of trawling and gillnets on the life cycles of fish remain unknown. The present work has surveyed the incidence of small-scale fisheries on the reproductive cycle of the Sciaenidae Menticirrhus americanus. Landings were sampled in 2006 and 2007, and sexual ratio, seasonal distribution of gonadal stages, gonadossomatic index and length at first maturity were estimated. Catches of reproductive individuals were analyzed according tothe fishing season and fishing gears employed. Resultes showed that catches of Menticirrhus americanus include, at least during two seasons per year, individuals in breeding activity. Trawlingdoes not catch maturing, mature or ripe specimens; gillnets of the caceio type act mainly on young and maturing individuals; and gillnets of the fundeio type act mainly on mature and ripeindividuals, in spring and summer.

  1. Inoculação de suspensão bacteriana de Plesiomonas shigelloides em Jundiá, Rhamdia quelen (Teleostei: Pimelodidae Inoculation of bacterial suspension of Plesiomonas shigelloides in jundiá, Rhamdia quelen (Teleostei: Pimelodidae

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    Cheila de Lima Boijink

    2001-06-01

    Full Text Available Com o crescimento da aqüicultura mundial e intensificação da criação de peixes, os animais ficam sujeitos às enfermidades bacterianas e outras. Com o objetivo de avaliar a patogenicidade da Plesiomonas shigelloides para jundiás (Rhamdia quelen, diferentes concentrações bacterianas (3 x 10(8 e 9 x 10(8 UFC - Unidade Formadora de Colônia/ml foram inoculadas por via intraperitoneal. Foram utilizados 84 jundiás juvenis com peso e comprimento médios de 24,37 ± 4,28g e 14,42 ± 1,62cm, respectivamente. Os animais inoculados foram mantidos durante 21 dias, em caixas d'agua de amianto, em condições semelhantes de temperatura, pH, alcalinidade e dureza. Os jundiás foram sacrificados a cada dois dias para contagem de UFC/ml de tecido renal. Por observações diárias, constatou-se que a inoculação intraperitoneal de Plesiomonas shigelloides não ocasionou nenhuma alteração nos jundiás, independente da concentração inoculada. As contagens das bactérias nos rins dos jundiás mantiveram-se entre 10(5 e 10(6UFC/ml até o 21º dia, quando o experimento foi finalizado.As worldwide aquaculture has grown, and intensification in fish raising, the animals are subject to bacterial diseases and others. With the aim of evaluating pathogenicity of Plesiomonas shigelloides for "jundiá" (Rhamdia quelen, different bacterial concentrations (3 x 10(8 e 9 x 10(8 CFU - Colony Former Unit/ml were inoculated via peritoneum. Eigthy four juvenile "jundiá" averaging 24.37 ± 4,28g of weight and 14.42 ± 1,62cm of length were utilized. The inoculated animals were maintained for 21 days, in asbestos water tanks, at similar temperature, pH, alkalinity and hardness conditions. The "jundiás" were slaughtered every other day for counting UFC/ml renal tissue. For daily inspections, it was observed that intraperitoneal inoculation of Plesiomonas shigelloides did not cause any change in the catfishes, regardless inoculated concentration. Bacteria counting in "jundiás" kidneys was maintained between 10(5 and 10(6 UFC/ml until the 21st day, when the experiment was ended.

  2. A mathematical model for growth in weight of silver catfish (Rhamdia quelen (Heptapteridae, Siluriformes, Teleostei Modelo matemático para crescimento em peso de jundiá (Rhamdia quelen (Heptapteridae, Siluriformes, Teleostei

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    Ana Paula da Silva Benaduce

    2006-10-01

    Full Text Available The use of a mathematical model applied to biological science helps to predict the specific data. Based on biological data (weight and age of silver catfish, Rhamdia quelen, a mathematical model was elaborated based on a nonlinear difference equation to demonstrate the relationship between age and growth in weight. Silver catfish growth was described following the Beverton-Holt model Pt+1 = (r Pt / (1+ a Pt , where r > 0 is the maximum growth rate and a > 0 is a constant of growth inhibition. The solution of this equation is Pt= 1 /{[1/P0 - a / (r-1] 1/r t + a/ (r-1}, were P0 is the initial weight of the fish. Through this model it was observed that the female reaches the theoretical maximum weight approximately at the age of 18 years and the male at the age of 12 years in a natural environment.A formulação de modelos matemáticos aplicado às ciências biológicas auxilia na previsão de dados específicos. Fundamentado em dados biológicos (peso e idade de jundiá, Rhamdia quelen, elaborou-se um modelo matemático com base em equações a diferenças não lineares para demonstrar a relação entre idade e crescimento em peso. O crescimento do jundiá foi descrito segundo o modelo de Beverton-Holt Pt+1 = (r Pt / (1+ a Pt, onde r > 0 é a taxa de crescimento máxima e a > 0 é uma constante de inibição do crescimento. A solução dessa equação é Pt= 1 / {[1/P0 - a / (r-1] 1/r t + a/ (r-1}, onde P0 é o peso inicial do peixe. Por esse modelo foi observado que fêmeas alcançam o peso máximo aproximadamente aos 18 anos e os machos aos 12 anos, em ambiente natural.

  3. Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes Estrutura gonadal e gametogênese de Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes

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    Rodrigo J. Guimarães-Cruz

    2005-09-01

    Full Text Available The gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker, 1979 were studied through anatomical and histological techniques. Forty two males and ten females in maturation/mature stage were captured in the reservoir of Porto Colombia, Paraná river basin, Minas Gerais, using gill nets, from November 2001 to October 2002 (tri-monthly captures. Examination of the testes revealed that they were paired, elongated and not fringed organs. Histologically, the testes presented three distinct regions: cranial espermatogenic; transistion espermatogenic and secretory; and caudal exclusively secretory. Standard histochemical techniques detected neutral glycoproteins from the secretion of the tubules of the caudal region. Espermatogenesis occurred in cysts throughout the whole extension of the wall of the seminiferous tubules, which anastomosis themselves and liberated the spermatozoa into the lumen of the espermatic ducts. The ovaries were paired, saculiformes and, histologically, they presented ovigerous lamellae that contained the cells of ovogenic ancestry. The oocytes were classified into four stages, based on their cytological characteristics and the cell layers that surrounded them. Post-ovulatory follicles and vitelogenic oocytes in the follicular atresia process also were observed.A estrutura gonadal e a gametogênese de Loricaria lentiginosa Isbrücker, 1979 foram estudadas através de técnicas anatômicas e histológicas. Capturaram-se, trimestralmente, no reservatório de Porto Colômbia, bacia do rio Paraná, Minas Gerais, quarenta e dois machos e dez fêmeas nos estádios em maturação/maduro, utilizando-se redes de emalhar, no período de novembro de 2001 a outubro de 2002. Os testículos são órgãos pares, alongados e não franjados. Histologicamente, os testículos apresentam três regiões distintas: cranial espermatogênica, transição espermatogênica e secretora e caudal exclusivamente secretora. Na secreção dos túbulos da região caudal detectaram-se glicoproteínas neutras. A espermatogênese ocorre em cistos em toda a extensão da parede dos túbulos seminíferos, os quais anastomosam-se e liberam os espermatozóides no lume dos ductos espermáticos. Os ovários são órgãos pares, saculiformes e, histologicamente, apresentam lamelas ovulígeras que contém as células da linhagem ovogênica. Os ovócitos foram classificados em quatro estádios, baseando-se em suas características citológicas e nas camadas que os circundam. Folículos pós-ovulatórios e ovócitos vitelogênicos em processo de atresia folicular foram também observados.

  4. Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes Sobreposición de nicho alimentario de dos especies endémicas chilenas de Trichomycterus (Teleostei: Siluriformes

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    SERGIO SCOTT

    2007-12-01

    Full Text Available Trichomycterus areolatus and Trichomycterus chiltoni are endemic siluriform fishes of Chile. They are the only Chilean species of this genus that live in sympatry and coexist in the Biobio basin. High trophic niche overlap between both species was found. Horn's index varied from 0.668 to 0.885 among seasons, without significant differences, and Schoener's index varied from 0.639 to 0.912. Also the discriminant analysis showed no significant differences in prey item between the two species. Trophic composition of T. chiltoni and T. areolatus consisted mainly in chironomid larvae and other aquatic invertebrates. At all seasons T. chiltoni showed the greatest prey richness. Principal component analysis (PCA showed a high similarity between diets of T. areolatus and T. chiltoni. These diet scores were significantly related with body size in T. chiltoni whereas T. areolatus showed a significant relationship with seasons. This may indicate a generalist strategy in T. areolatus by varying its diet in function of available prey items in each season, whereas T. chiltoni would be specialized in relation to individual size and intraspecific habitat partitioningTrichomycterus areolatus y Trichomycterus chiltoni son peces Siluriformes endémicos de Chile, siendo las únicas especies chilenas conocidas de este género que coexisten en simpatría. Se encontró alta sobreposición de nicho trófico entre estas dos especies. El índice de Horn varió de 0,668 a 0,885 entre estaciones, sin diferencias significativas, y el índice de Schoener varió de 0,639 a 0,912. Además el análisis discriminante no mostró diferencias significativas en las presas entre las dos especies. La composición de la dieta de T. chiltoni y T. areolatus consistió principalmente en larvas de chironómidos y otros invertebrados acuáticos. En todas las estaciones estudiadas T. chiltoni mostró una riqueza de presas mayor. El análisis de componentes principales (PCA mostró una gran similitud entre las dietas de T. areolatus y T. chiltoni. Estos resultados se relacionaron significativamente con las medidas de tamaño corporal en T. chiltoni mientras que T. areolatus mostró una relación significativa con las estaciones. Esto podría indicar una estrategia generalista en T. areolatus, variando su dieta en función de las presas disponibles en cada estación, mientras que T. chiltoni estaría especializado en función del tamaño individual

  5. Morfologia e crescimento do músculo estriado esquelético no pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae = Morphology and skeletal muscle growth in pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae

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    Fernanda Regina Carani

    2008-04-01

    Full Text Available O objetivo deste trabalho foi avaliar as características morfológicas e de crescimento do músculo estriado esquelético no pirarucu (Arapaima gigas. Foram utilizados animais em duas fases de crescimento: alevinos, com 50 dias de idade, e juvenis, com umano de idade. Após eutanásia dos animais, fragmentos musculares das regiões dorsal, lateral cranial e lateral caudal foram coletados e congelados em nitrogênio líquido. Cortes histológicos (10 mm foram submetidos às colorações HE e Tricrômico de Gomori, para a análise morfológica, e NADH-TR, para a análise do metabolismo oxidativo das fibras musculares. Foi calculado o menor diâmetro das fibras musculares brancas nas regiões dorsal e lateral cranial. A musculatura dorsal branca mostrou-se mais desenvolvida e, namusculatura lateral, observaram-se compartimentos distintos: superficial vermelho e profundo branco. Nos alevinos, o crescimento muscular ocorreu predominantemente por hiperplasia das fibras e, nos juvenis, predominou o crescimento muscular por hipertrofia.The aim of this work was to evaluate the morphological and growth characteristics of skeletal muscle tissue in pirarucu (Arapaimagigas using alevins (50 days old and juveniles (1 year old. Muscle samples were collected from dorsal, lateral cranial and lateral caudal regions, and then frozen in liquid nitrogen. Histological frozen sections (10μm were stained with HE and Gomori Trichrome formorphological analysis, and NADH-TR to evaluate muscle fiber oxidative metabolism. Morphometric analysis samples were obtained from dorsal and lateral cranial regions, and the smallest-diameter white fibers were measured. White dorsal muscle was thicker, andtwo muscle fiber compartments were identified in the lateral cranial region: red (superficial and white (deep muscle. Hyperplasia muscle growth predominated in alevins and hypertrophy in juveniles.

  6. Desenvolvimento gonadal do jundiá, Rhamdia quelen (Teleostei, Siluriformes, em viveiros de terra, na região sul do Brasil = Gonadal development of jundiá, Rhamdia quelen (Teleostei, Siluriformes, in earthen ponds in southern Brazil

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    Luciana Ghiraldelli

    2007-10-01

    Full Text Available O presente estudo caracterizou o desenvolvimento gonadal de jundiá até a maturação sexual, quando cultivados em viveiros de terra, visando subsidiar o desenvolvimento de tecnologia de cultivo para esta espécie na região sul do Brasil. Alevinos de jundiá (peso médio 8 ± 3,73 g foram estocados em três viveiros, na densidade de 0,6indivíduos m-2. Catorze indivíduos foram amostrados mensalmente, de setembro de 2001 a outubro de 2002. Os estádios de maturação gonadal foram caracterizados macroscopicamente, e fragmentos de ovários e testículos de alguns exemplares foram fixados em formalina 4% para análise histológica. Foram analisados 118 exemplares: 60 machos e 58 fêmeas. Os machos apresentaram atividade reprodutiva precoce, quandocomparados às fêmeas. Testículos e ovários apresentaram morfologia similar a de outras espécies de Siluriformes. De acordo com a análise microscópica, as gônadas foram classificadas em quatro estádios de desenvolvimento: imaturo, em maturação inicial, em maturação final e maduro. A relação gonadossomática variou de 0,29 a 9,16 para os machose de 0,11 a 13,03 para as fêmeas. Indivíduos maduros foram observados nos meses de verão (dezembro/2001 e janeiro/2002, outono (abril e maio/2002 e primavera (setembro e outubro/2002, acompanhando o aumento de temperatura.The study characterized the gonadal development of jundiá from approximately 8 g until gonadal maturation, to provide further knowledge for farming jundiá in Southern Brazil. Jundiá fingerlings(average weight 8.00 ± 3.73 g were stocked in three ponds at 0.6 fish m-2. Fourteen fish were sampled each month from September 2001 to October 2002. Gonadal maturation stages were characterized macroscopically, and samples of ovaries and testicles were fixedin 4-%-buffered formalin for histological examination. One hundred and eighteen fish were analyzed: 60 males e 58 females. Jundiá males matured earlier than females. Testicles and ovaries presented similar morphology to other Siluriformes species. Gonads were classified in four development phases of the ovarian follicle, according to histology: immature, initial maturation, final maturation and mature. The gonadosomatic index varied from 0.29 to 9.16 for males and from 0.11 to 13.03 for females. Mature individuals were observed during summer (December/2001 and January/2002, fall (April and May/2002 and spring (September and October/2002, following the increase in water temperature.

  7. Tolerância de juvenis do pampo Trachinotus marginatus (Teleostei, Carangidae ao choque agudo de salinidade em laboratório Acute salinity tolerance of juvenile pompano Trachinotus marginatus (Teleostei, Carangidae under laboratory conditions

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    Luís André Sampaio

    2003-08-01

    Full Text Available O pampo Trachinotus marginatus é uma espécie com potencial para piscicultura, mas a sua utilização pode ser limitada pelas variações de salinidade comuns em estuários ou em ambientes super-salinos. Este trabalho foi realizado com o objetivo de determinar a tolerância à salinidade de juvenis de T. marginatus em laboratório. Foram testadas 12 salinidades em duplicata (0, 6, 8, 10, 15, 25, 45, 55, 58, 61, 65 e 75‰ e um tratamento controle (35‰. Dez peixes (comprimento total: 20,7±2,3mm e peso úmido: 427±113mg foram colocados em tanques plásticos de 3L. A temperatura da água foi mantida em 24ºC com um banho termostatisado, aeração constante e, a cada 24 horas, os meios experimentais foram completamente renovados. Após 96 horas de exposição, as salinidades letais médias inferior e superior, com os respectivos intervalos de confiança (IC 95%, foram estimadas em 6,99‰ (IC 95% = 6,86-7,13‰ e 58,50‰ (IC 95% = 56,81-60,24‰, respectivamente. Estes resultados permitem caracterizar esta espécie como eurialina. O estudo da influência da salinidade sobre T. marginatus deve ser aprofundado, buscando avaliar principalmente os efeitos sobre o crescimento, de modo que seja possível determinar o potencial do seu cultivo em ambientes com diferentes salinidades.The pompano Trachinotus marginatus shows good potential for aquaculture, but the success of its culture might be limited by the salinity fluctuations common in estuaries or in hyper-saline environments. The objective of this work was to establish the salinity tolerance of juvenile T. marginatus under laboratory conditions. Twelve salinities (0, 6, 8, 10, 15, 25, 45, 55, 58, 61, 65, and 75‰ plus a control (35‰ were tested in duplicate. Groups of ten fish (total length: 20.7±2,3mm and wet weight: 427±113mg were placed in plastic tanks with 3L of water. A water bath was set to control the temperature at 24ºC, water was continuously aerated, and completely exchanged every 24h. After 96 hours, lower and upper medium lethal salinities and their respective confidence intervals (CI 95% were estimated as 6.99‰ (CI 95% = 6.86-7.13‰, and 58.50‰ (CI 95% = 56.81-60.24‰, respectively. These results allow the characterization of this species as euryhaline. The influence of salinity on T. marginatus should be studied with more detail, with special attention to its effects on growth, in order to determine the potential for T. marginatus culture in different salinities.

  8. Atividade reprodutiva de peixes (Teleostei e o defeso da pesca de arrasto no litoral norte de Santa Catarina, Brasil Reproductive activity of fish (Teleostei and closed season to shrimp trawling off ther northern coast of Santa Catarina, Brazil

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    Leda M. de Souza

    2007-12-01

    Full Text Available Desembarques de arrasto visando à pesca do camarão sete-barbas, Xiphopenaeus kroyeri, foram acompanhados de 2005 a 2007 no município de São Francisco do Sul, Santa Catarina. Setenta e seis espécies de teleósteos foram registradas como captura incidental e seus indivíduos foram avaliados quanto ao estádio de maturação e Índice de Atividade Reprodutiva. Constatou-se que indivíduos de metade das espécies são capturados com gônadas maduras, em estações que variaram conforme a espécie. Em Isopisthus parvipinnis a atividade enquadrou-se na categoria "muito intensa" na primavera de 2005 e no verão de 2007; em Menticirrhus americanus, Stellifer sp., Pomadasys corvinaeformis, Stellifer brasiliensis, Syacium papillosum, Larimus breviceps, Diapterus rhombeus, Symphurus tessellatus, Chirocentrodon bleekerianus, Pellona harroweri, Anchoa tricolor e Selene setapinnis apenas em uma estação, dependendo da espécie. O verão de 2007, seguido da primavera de 2005, foram as estações em que o arrasto incidiu sobre maior número de espécies em atividade reprodutiva "intensa" ou "muito intensa". No verão de 2007 o arrasto camaroeiro incidiu sobre um conjunto de espécies em atividade reprodutiva maior que na mesma estação em 2006. Atribui-se esse fato à proibição legal do arrasto de camarão no trimestre de outubro-dezembro de 2006, favorecendo a atividade reprodutiva das espécies na estação subseqüente. Recomenda-se que a gestão da pesca camaroeira na região mantenha o defeso de arrasto na primavera, assim beneficiando não apenas as espécies de peixes que desovam nesta estação, mas também aquelas que se preparam para a desova no verão.Shrimp trawling was monitored in southern Brazil in order to study the reproductive status of teleosts occurring as by-catch. From 2005 to 2007 seventy-six fish species were found in this kind of fisheries. Gonad stages were evaluated and the Reproductive Activity Index was calculated. Mature individuals were 50% of the total caught as by-catch. Breeding activity in Isopisthus parvipinnis was "very high" in spring 2005 and summer 2007, and in a particular season (depending on the species in Menticirrhus americanus, Stellifer sp., Pomadasys corvinaeformis, Stellifer brasiliensis, Syacium papillosum, Larimus breviceps, Diapterus rhombeus, Symphurus tessellatus, Chirocentrodon bleekerianus, Pellona harroweri, Anchoa tricolor, and Selene setapinnis. In the summer of 2007, followed by the spring of 2005, trawling caught more species in "high" or "very high" breeding activity. In the summer of 2007 a larger number of species was in reproductive activity than the same season of 2006, due to a closed season in October-December 2006. Aiming to improve the fish breeding activity in this region, it is recommended to close this area for shrimp trawling during the spring. This measure could be positive for both species that spawn in spring and those preparing to spawn in the summer.

  9. Relação peso-comprimento de Orthopristis ruber (Cuvier (Teleostei, Haemulidae na Baia de Sepetiba, Rio de Janeiro, Brasil Length-weight relationship of Orthopristis ruber (Cuvier (Teleostei, Haemulidae in the Sepetiba Bay, Rio de Janeiro, Brazil

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    André L. B. dos Santos

    2004-06-01

    Full Text Available A relação peso-comprimento de Orthopristis ruber (Cuvier, 1830 na Baia de Sepetiba (22º54'-23º04'S; 43º34'-44º10'W, Rio de Janeiro foi determinada. Este trabalho objetiva contribuir com o conhecimento sobre a morfometria desta espécie na baía e fornecer bases para comparações com outros ambientes. Os peixes foram coletados em programas de amostragens de arrasto de praia (juvenis e arrasto de fundo (adultos entre outubro de 1998 e setembro de 1999. A equação encontrada foi W = 0,000006 L3,1368 para machos e W = 0,000006 L3,14º3 para fêmeas. Alometria positiva foi encontrada para machos e fêmeas e a proporção sexual foi de 1:1. Os altos valores para o coeficiente alométrico indicam alto investimento no crescimento, que pode ser devido ao pequeno tamanho relativo dos espécimes da população analisada, ou ser um mecanismo para suportar as condições de estresse nesta área.The lenght-weight relationship of Orthopristis rubber (Cuvier, 1830 in the Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W, Rio de Janeiro was determined. It aims to contribute to morphometrics knowledge of this species in a semi-closed coastal area and to supply basis for comparisons with others environment. Fishes were collected by beach seine (juveniles and otter trawl (adults from October 1998 to September 1999. The equation found was W = 0,000006 L3,1368 for males and W = 0,000006 L3,14º3 for females. Positive allometry was found for both sexes and sex rate was 1:1. The comparatively high values for allometric coefficient indicate high investment in growth, which can be due to relatively small size of the examined fish populations, or a mechanism to overcome stress conditions in the area.

  10. Biologia reprodutiva de Astyanax henseli (Teleostei, Characidae do curso superior do Rio dos Sinos, RS, Brasil Reproductive biology of Astyanax henseli (Teleostei, Characidae in the upper Rio dos Sinos, RS, Brazil

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    Renato B Dala-Corte

    2010-09-01

    Full Text Available No presente estudo é descrita a biologia reprodutiva de uma população de Astyanax henseli Melo & Buckup, 2006 do curso superior do rio dos Sinos, Caraá, Rio Grande do Sul, Brasil. Foram analisados 336 exemplares, sendo 169 machos, 154 fêmeas e 13 cujo sexo não foi possível ser determinado. O período reprodutivo teve aproximadamente cinco meses de duração, ocorrendo entre agosto e dezembro, com pico do índice gonadossomático (IGS em outubro, correspondendo ao final do inverno e a primavera no hemisfério sul. Não houve correlação estatisticamente significativa do IGS com os fatores abióticos (temperatura, precipitação e fotoperíodo. No entanto, sugere-se que estes fatores estejam atuando como desencadeadores da maturação gonadal. Fatores bióticos como o índice de repleção estomacal (IR e índice hepatossomático (IHS, também não mostraram correlação estatisticamente significativa com o IGS. Apesar disso, os valores de IR indicam que A. henseli continua se alimentando ativamente durante o período reprodutivo, enquanto que os baixos valores de IHS durante do pico reprodutivo sugerem um maior gasto das reservas hepáticas neste período. A proporção sexual de 1:1 foi encontrada ao longo dos meses do ano, nas classes de comprimento e na população como um todo. O comprimento de primeira maturação gonadal foi estabelecido em 69 mm para os machos e 60 mm para as fêmeas. A média da fecundidade absoluta foi de 3.038 ovócitos e a da fecundidade relativa 0,13 ovócitos mg-1. O desenvolvimento ovocitário indicou uma desova total.This study describes the reproductive biology of a population of Astyanax henseli Melo & Buckup, 2006 from the upper Rio dos Sinos, Caraá, Rio Grande do Sul, Brazil. A total of 336 specimens was analyzed, comprising 169 males, 154 females and 13 individuals of undetermined sex. The reproductive season lasted approximately five months, from August to December, gonadossomatic index (GSI peaked of in October, corresponding to the end of winter and the spring in the southern hemisphere. No correlation was found between the GSI and abiotic factors (temperature, rainfall and photoperiod. However, these factors may trigger gonad maturation. Also, no correlation was observed between biotic variables, such as stomach repletion index (RI and hepatosomatic index (HSI, and GSI. Despite that, high RI values during the reproductive period may indicate that A. henseli maintains its feeding activity throughout the reproductive months, while low HSI values during the peak of GSI suggest a higher energy expenditure of the liver during this period. The sex ratio in the population was 1:1 for the total number of individuals sampled, among different classes of length, and among the different months of the year. The size at first gonadal maturation was 69 mm for males and 60 mm for females. The absolute fecundity mean was 3,038 oocytes and the relative fecundity mean was 0.13 oocytes mg-1. The oocyte development indicated that A. henseli is a total spawner.

  11. Description of a new species of Trimma (Perciformes: Gobiidae) from the Red Sea, with a discussion of the generic separation of Trimma and Priolepis, with discussion of sensory papillae terminology.

    Science.gov (United States)

    Hoese, Douglass F; Bogorodsky, Sergey V; Mal, Ahmad O

    2015-10-06

    A new species of Pygmygoby, Trimma quadrimaculatum, n. sp., is described from the Saudi Arabian coast of the Red Sea on the basis of 16 adult specimens. It is small-sized species, with the largest examined specimen reaching only 16.8 mm SL. The new species has characteristics of both Priolepis and Trimma, and easily may be confused with Priolepis randalli and Trimma mendelssohni; it can distinguish from other species by combination of characters: dorsal-fin rays D VI + I,8; anal-fin rays I,7; longitudinal scale series 23-25; median predorsal scales 6-8 (usually 7 or 8); head naked; a pair of modified elongate papillae on nape; fifth pelvic-fin ray with 2 dichotomous branches; body with broad, irregular, brown bars, last bar posteriorly on caudal peduncle extending basally on to rays of caudal fin; head with three dark brown bars below eye; four subcutaneous dark brown spots ventrally on posterior half of body; and basal quarter of second and third membranes of first dorsal fin with diffuse dark blotch. Placement of the new species in Trimma is based on the presence of more characteristics currently associated with Trimma than with Priolepis. The generic separation of the two genera is discussed, suggesting that further work is needed to clarify the separation of these two genera.

  12. Rhabdosargus holubi Rhabdosargus globiceps

    African Journals Online (AJOL)

    M.Sc. thesis, University of Miami. CYRUS, D.P. 1980. The biology of Gerreidae Bleeker, 1859. (Teleostei) in Natal Estuaries. M.Sc. thesis, University of Natal,. Pietermaritzburg. CYRUS, D.P. & BLABER, S.J.M. 1982. Mouthpart structure and function and feeding mechanisms of Gerres (Teleostei) QUoy &. Gaimard, 1824.

  13. More new deep-reef basslets (Teleostei, Grammatidae, Lipogramma, with updates on the eco-evolutionary relationships within the genus

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    Carole C. Baldwin

    2018-01-01

    Full Text Available Two new Lipogramma basslets are described, L. barrettorum and L. schrieri, captured during submersible diving to 300 m depth off Curaçao, southern Caribbean. Superficially resembling L. robinsi in having 11–12 bars of pigment on the trunk, L. barrettorum is distinct from L. robinsi in having a stripe of blue-white pigment along the dorsal midline of the head (vs. a cap of yellow pigment, in patterns of pigment on the median fins, and in having 8–10 gill rakers on the lower limb of the first arch (vs. 11–12. Lipogramma schrieri is distinct from all congeners in having seven or eight dark bars of pigment on the trunk and broad, irregular, whitish blue markings on the dorsal portion of the head. The new species are genetically distinct from one another and from seven other Lipogramma species for which genetic data are available. A phylogenetic hypothesis derived from mitochondrial and nuclear genes suggests that the new species belong to a clade that also comprises L. evides and L. haberi. Collectively those four species are the deepest-living members of the genus, occurring at depths predominantly below 140 m. This study thus provides further evidence of eco-evolutionary correlations between depth and phylogeny in Caribbean reef fishes. Tropical deep reefs are globally underexplored ecosystems, and further investigation of Caribbean deep reefs undoubtedly will provide samples of species for which no genetic material currently exists and reveal more cryptic species diversity in the genus.

  14. General characteristics of the diet of Trachinotus paitensis (Teleostei: Carangidae) from San Ignacio Lagoon, Baja California Sur, Mexico

    OpenAIRE

    V.H. Cruz Escalona; L.A. Abitia Cárdenas

    2004-01-01

    The food habits of Trachinotus paitensis, in San Ignacio Lagoon B.C.S., Mexico, were investigated. We observed that T. paitensis is carnivorous, feeding mainly on benthic invertebrates (the gastropods Anachis spp., Bittium spp., and the crustacean larvae). We concluded that T. paitensis is an opportunist predator that impacts mainly on epibenthic invertebratesFueron investigados los hábitos alimenticios de Trachinotus paitensis, en la laguna San Ignacio B.C.S., México. Se observó que T. paite...

  15. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae, from the Iberian Peninsula

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    Catarina Nabais

    2013-03-01

    Full Text Available In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998 is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3-fluorescence, Silver-impregnation (Ag-NORs and molecular (fluorescence in situ hybridization (FISH with 18S rDNA probe protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species.

  16. Biflagellate spermatozoon structure of the hermaphrodite fish Satanoperca jurupari (Heckel, 1840 (Teleostei, Cichlidae from the Amazon River

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    MATOS E.

    2002-01-01

    Full Text Available The ultrastructural features of the sperm were studied in the hermaphroditic teleost Satanoperca jurupari HECKEL, 1840 from Amazon River. Spermatocytes, spermatids and sperm develop in the testicular cysts among the different oocyte stages. Different stages of early spermatocyte development, mainly the ones with synaptonemal complexes were often observed. The mature spermatozoa belong to the introsperm type, with a short head (~ 3 mm long and 1.3 mum wide without acrosome, short midpiece (~ 1.2 mum long and 1.8 mum wide containing several mitochondria surrounding two centrioles and forming a mitochondrial collar. They have two flagella (each ~15 mum long each of which has a common 9 + 2 microtubular pattern. Each flagellum has two opposite lateral cytoplasmic extensions that begin about 3 mum the midpiece still close to the end piece of flagellum.

  17. A complex of species related to Paradiscogaster glebulae (Digenea: Faustulidae) in chaetodontid fishes (Teleostei: Perciformes) of the Great Barrier Reef.

    Science.gov (United States)

    Diaz, Pablo E; Bray, Rodney A; Cutmore, Scott C; Ward, Selina; Cribb, Thomas H

    2015-10-01

    A total of 1523 individuals of 34 species of chaetodontids from the Great Barrier Reef were examined for faustulid trematodes. Specimens resembling Paradiscogaster glebulae Bray, Cribb & Barker, 1994 were found in nine chaetodontid species at three localities. These specimens are shown, on the basis of combined morphological and molecular analyses, to comprise a complex of morphologically similar and partly cryptic species. The complex may comprise as many as six distinct species of which three are resolved here. The true P. glebulae is identified in Chaetodon ornatissimus Cuvier, 1831, Chaetodon aureofasciatus Macleay, 1878, Chaetodon plebeius Cuvier, 1831, Chaetodon rainfordi McCulloch, 1923 and Chaetodon speculum Cuvier, 1831. Two new species are described, Paradiscogaster munozae n. sp. from Heniochus varius (Cuvier, 1829), Heniochus chrysostomus Cuvier, 1831 and Chaetodon citrinellus Cuvier, 1831 and Paradiscogaster melendezi n. sp. from Chaetodon kleinii Bloch, 1790. In terms of morphology the three species differ most clearly in the development of the appendages on the ventral sucker. The three species differ at 3-6consistent bp of ITS2 rDNA. The host-specificity of the three species differs strikingly. P. melendezi n. sp. infects just one fish species, P. glebulae infects species of only one clade of Chaetodon, and P. munozae n. sp. infects quite unrelated species. The basis of this unusual pattern of host-specificity requires further exploration. Two of the species recognised here, P. glebulae and P. munozae n. sp., showed apparent intra-individual variation in the ITS2 rDNA sequences as demonstrated by clear, replicated double peaks in the electropherograms. Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.

  18. Atherinella blackburni (Schultz, 1949 at Itamambuca Beach, Ubatuba, SP: ecological characterization and distribution on the Brazilian coast (Teleostei: Atheriniformes: Atherinopsidae

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    GMT. Mattox

    Full Text Available Atherinella blackburni is a silverside species whose occurrence on the Brazilian coast was not properly registered until recently. So far, records of its distribution along the Brazilian shore were limited to Itaparica Island, Bahia State, and Porto Inhaúma, Rio de Janeiro State. In a recent survey of the ichthyofauna of Itamambuca Beach, Ubatuba, São Paulo State, 100 specimens of this species were collected, yielding a considerable source of information regarding its ecology and a new southern limit of its distribution. A detailed survey of an ichthyological collection revealed lots of this species from regions of the Brazilian Northeast, resulting in a northward expansion of the occurrence of A. blackburni in Brazilian waters. Besides the populations found on the Brazilian coast, the species also occurs discontinuously in the Atlantic coasts of Costa Rica, Panama and Venezuela. Meristic and morphometric analysis showed overlapped values between Brazilian populations and the ones closer to the Caribbean. An ecological study of A. blackburni at Itamambuca Beach revealed that it is a predominantly diurnal species with preference for warm and salty waters, often occurring in sandy-bottom environments. It was more abundant in Summer and Winter, when individuals with smaller values of length and weight also occurred.

  19. Comparison of the Nasal Olfactory Organs of Various Species of Lizardfishes (Teleostei: Aulopiformes: Synodontidae with Additional Remarks on the Brain

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    L. Fishelson

    2010-01-01

    Full Text Available The olfactory organs of lizardfishes (Synodontidae are situated in two capsules connected to the outside by incurrent and excurrent openings. The olfactory epithelium is in form of petal rosettes each composed of lamellae and a rephe, and bear olfactory receptor neurons, supporting cells and cells with kinocillia. The dimension of rosettes and lamellae, as well as the number of lamellae, increase with growth of the fish; until in adult fish these parameters remaine constant, species specific. In adult Synodus spp. and Trachinocephalus myops the rosettes are 3.5–4.0 mm long, with 5–8 lamellae, whereas in Saurida spp. they are 8.0 mm and possess up tp 22 lamellae. The number of ORN ranges from 2,600 on the smaller lamellae to 20,000 on the largest ones. The number of ORN/mm2 of olfactory is ca. 30,000 in Saurida spp. Thus the rosettes of S. macrolepis with 20 lamellae possess a total of ca. 170,000 ORN, whereas those of Sy. variegatus and T. myops with the average of six lamellae possess only ca. 50,000–65,000 ORN. The olfactory nerves lead from the rosettes to the olfactory balbs situated on the olfactory lobes. The differences among the species in olfactory organs are discussed in correlation with their distribution.

  20. Temporal and ontogenetic variations in feeding habits of Hollandichthys multifasciatus (Teleostei: Characidae in coastal Atlantic rainforest streams, southern Brazil

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    Vinícius Abilhoa

    2009-09-01

    Full Text Available Feeding habits of the characin Hollandichthys multifasciatus were investigated. Samplings were made between March 2004 and February 2005 in two black water streams of the coastal Atlantic rainforest in southern Brazil. The diet, evaluated by qualitative and quantitative methods, included aquatic and terrestrial insects, decapods, oligochaetes, plants and spiders. Large individuals feed mainly on plants, terrestrial insects, and spiders, whereas small fish feed basically on plants and oligochaetes. The species showed an omnivorous feeding habit, and its diet was composed of autochthonous (mainly oligochaetes and allochthonous (plants and terrestrial insects material.Neste estudo foram investigados os hábitos alimentares do caracídeo Hollandichthys multifasciatus. Amostras foram obtidas entre março de 2004 e fevereiro de 2005, em dois riachos de água escura da Floresta Atlântica Costeira do Sul do Brasil. A dieta, avaliada por métodos quantitativos e qualitativos, inclui insetos aquáticos e terrestres, decápodes, oligoquetos aquáticos, plantas e aranhas. Os maiores indivíduos alimentaram-se principalmente de plantas, insetos terrestres e aranhas, enquanto que os menores indivíduos alimentaram-se basicamente de plantas e oligoquetos aquáticos. A espécie apresentou hábito alimentar onívoro, e sua dieta no riacho estudado foi composta por material autóctone (principalmente oligoquetos aquáticos e alóctone (plantas e insetos terrestres.

  1. Temporal and ontogenetic variations in feeding habits of Hollandichthys multifasciatus (Teleostei: Characidae in coastal Atlantic rainforest streams, southern Brazil

    Directory of Open Access Journals (Sweden)

    Vinícius Abilhoa

    Full Text Available Feeding habits of the characin Hollandichthys multifasciatus were investigated. Samplings were made between March 2004 and February 2005 in two black water streams of the coastal Atlantic rainforest in southern Brazil. The diet, evaluated by qualitative and quantitative methods, included aquatic and terrestrial insects, decapods, oligochaetes, plants and spiders. Large individuals feed mainly on plants, terrestrial insects, and spiders, whereas small fish feed basically on plants and oligochaetes. The species showed an omnivorous feeding habit, and its diet was composed of autochthonous (mainly oligochaetes and allochthonous (plants and terrestrial insects material.

  2. Fishery of the Goliath grouper, Epinephelus itajara (Teleostei: Epinephelidae based on local ecological knowledge and fishery records in Yucatan, Mexico

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    Alfonso Aguilar-Perera

    2009-09-01

    Full Text Available The Goliath grouper, Epinephelus itajara, a large-bodied (~ 2.5 m TL, > 400 kg and critically endangered fish (Epinephelidae, is highly vulnerable to overfishing. Although protected from fishing in many countries, its exploitation in Mexico is unregulated; a situation that puts its populations at risk. Fishery records of E. itajara are scarce, which prevents determination of its fishery status. This work aimed to elucidate the E. itajara fishery in the northern Yucatan Peninsula by 1 analyzing available catch records and 2 interviewing veteran fishermen (local ecological knowledge from two traditional landing sites: Dzilam de Bravo and Puerto Progreso. Historic fishery records from two fishing cooperatives were analyzed in order to elucidate the current situation and offer viable alternatives for conservation and management. Catches have decreased severely. Local knowledge obtained from fishermen represented a very important source of information for reconstructing the fisheries history of this species. Conservation measures that incorporate regional and international regulations on critically endangered fish species are suggested. Rev. Biol. Trop. 57 (3: 557-566. Epub 2009 September 30.La cherna, Epinephelus itajara, un mero (Epinephelidae corpulento (~ 2.5 m TL, > 400 kg y amenazado, es altamente vulnerable a la sobrepesca. Si bien es protegido en varios países, en México su explotación no está regulada; situación que pone a su población en riesgo. Sus registros pesqueros son escasos, lo que impide determinar su condición pesquera. Este trabajo intentó ilustrar la pesquería en el norte de la Península de Yucatán usando procedimientos que involucraron analizar registros y entrevistar a pescadores veteranos (conocimiento ecológico tradicional de dos sitios de desembarque: Dzilam de Bravo y Puerto Progreso. Se analizaron registros pesqueros históricos de dos cooperativas pesqueras para determinar la situación actual y ofrecer alternativas viables para conservación y manejo. Las capturas han disminuido drásticamente. El conocimiento local obtenido de los pescadores representa una fuente muy importante de información para ayudar a reconstruir la historia pesquera de esta especie. Se sugieren medidas de conservación que incorporen regulaciones nacionales e internacionales para especies de peces.

  3. Three sympatric karyomorphs in the fish Astyanax fasciatus (Teleostei, Characidae do not seem to hybridize in natural populations

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    Maressa Ferreira-Neto

    2012-01-01

    Full Text Available Ninety individuals of the characid fish Astyanax fasciatus (Cuvier, 1819 were collected at Água da Madalena stream (Botucatu, São Paulo, Brazil and analyzed for diploid chromosome number 2n and karyotype composition as well as for the chromosomal location of the 5S and 18S ribosomal DNA (rDNA. Whereas no chromosome differences were associated with sex, three different karyomorphs with diploid chromosome numbers 2n=46, 2n=48 and 2n=50 were found. No intermediate 2n numbers were discovered. The 2n=50 karyomorph showed some differences in 18S rDNA location compared to the two other karyomorphs. Finally, all specimens with the 2n=46 karyomorph showed the presence of a partly heterochromatic macro supernumerary chromosome, which was absent in all individuals with the two other karyomorphs. All these results suggest that indviduals of the three different karyomorphs are not likely to hybridize in the examined populations. Our findings strongly suggest the presence of three separate species (sensu biological species concept easily diagnosed on the basis of differences in the diploid chromosome numbers and other chromosomal markers.

  4. Extensive hybridization and associated geographic trends between two rockfishes Sebastes vulpes and S. zonatus (Teleostei: Scorpaeniformes: Sebastidae).

    Science.gov (United States)

    Muto, N; Kai, Y; Noda, T; Nakabo, T

    2013-08-01

    Interspecific hybridization is an important evolutionary process, which has significant influence on the diversity within and between participating taxa. Although interspecific hybridization in terrestrial and freshwater organisms has been subjected to many detailed studies, studies in marine realm have been limited in terms of both numbers and detail. In this study, the potential for interspecific hybridization between two rockfishes, Sebastes vulpes and S. zonatus, occurring in the western North Pacific, was assessed on the basis of 177 specimens collected from three sampling localities within the main geographic distribution of both species, and analysed using a combination of amplified fragment length polymorphisms (AFLP), mitochondrial DNA (mtDNA) markers and morphometric characters. Bayesian-based individual genetic assignment based on 364 AFLP loci detected a total of 63 (35.6%) hybrid specimens in the data set, the presence of interspecific hybrids also being rigorously supported by mtDNA analysis using partial sequences from the control region and morphological analysis based on 31 morphometric characters. Hybrids from all three localities were found, showing a common pattern of biased introgression across the localities whereby hybrids were more closely related to S. zonatus than to S. vulpes. Apart from this common pattern, rates of hybridization varied considerably among the localities, being greater in the northern localities. Variations in the local rates of hybridization were associated with variations in habitat segregation and thermal regime, implying that vertical water temperature regimes determined the extent of habitat segregation of the two species and, accordingly, the opportunity for hybridization. © 2013 The Authors. Journal of Evolutionary Biology © 2013 European Society For Evolutionary Biology.

  5. General characteristics of the diet of Trachinotus paitensis (Teleostei: Carangidae) from San Ignacio Lagoon, Baja California Sur, Mexico

    OpenAIRE

    Cruz Escalona, V H.; Abitia Cárdenas, L A.

    2014-01-01

    The food habits of Trachinotus paitensis, in San Ignacio Lagoon B.C.S., Mexico, were investigated. We observed that T. paitensis is carnivorous, feeding mainly on benthic invertebrates (the gastropods Anachis spp., Bittium spp., and the crustacean larvae). We concluded that T. paitensis is an opportunist predator that impacts mainly on epibenthic invertebrates. Fueron investigados los hábitos alimenticios de Trachinotus paitensis, en la laguna San Ignacio B.C.S., México. Se observó que T. ...

  6. Cryptomyrus: a new genus of Mormyridae (Teleostei, Osteoglossomorpha) with two new species from Gabon, West-Central Africa

    OpenAIRE

    Sullivan,John P.; Lavoue,Sebastien; Hopkins,Carl

    2016-01-01

    Abstract We use mitochondrial and nuclear sequence data to show that three weakly electric mormyrid fish specimens collected at three widely separated localities in Gabon, Africa over a 13-year period represent an unrecognized lineage within the subfamily Mormyrinae and determine its phylogenetic position with respect to other taxa. We describe these three specimens as a new genus containing two new species. Cryptomyrus , new genus, is readily distinguished from all other mormyrid genera by a...

  7. A new record of a flathead fish (Teleostei: Platycephalidae) from China based on morphological characters and DNA barcoding

    Science.gov (United States)

    Qin, Yan; Song, Na; Zou, Jianwei; Zhang, Zhaohui; Cheng, Guangping; Gao, Tianxiang; Zhang, Xiumei

    2013-05-01

    A new record of Platycephalus sp.1 (sensu Nakabo, 2002) was documented based on morphological characters and DNA barcoding. We collected 174 specimens of the genus Platycephalus from Chinese coastal waters of Dongying, Qingdao, Zhoushan, and Beihai. Samples were identified as Platycephalus sp.1 morphologically. The coloration, meristic traits, and morphometric measurements are consistent with previously published records. In brief, it is an orange-brown flathead fish with dark brown spots scattered on head and body, lateral line scales 83 to 99 with one or two spine-bearing anteriormost pored scale, no yellow blotch on the caudal fin. Cytochrome oxidase I subunit (COI) gene fragments were sequenced for phylogenetic analysis. The mean evolutionary distance within the species Platycephalus sp.1 was 0.1%. Net evolutionary distances between Platycephalus sp.1 and other species of Platycephalus ranged from 10.8% to 19.7%, which is much greater than the threshold for species delimitation. The COI sequence analysis strongly supports the validity of Platyceohalus sp.1 at genetic level.

  8. Differentiation and growth of myotomal muscles in a non-model tropical fish Pterophyllum scalare (Teleostei: Cichlidae).

    Science.gov (United States)

    Kacperczyk, A; Jędrzejowska, I; Daczewska, M

    2011-12-01

    Somite differentiation, muscle fibres formation and growth were analysed in a non-model tropical fish Pterophyllum scalare. In this study, it was found that during somite differentiation, a primary myotome appears. The primary myotome is filled with multinucleated myotubes that constitute the major part of the somite. Subsequently, Pax-3 (paired-box protein)-positive cells, located externally to the myotomes, appear. In post-hatching stages, mononucleated proliferating cell nuclear antigen-positive cells are observed in the inter-myotomal spaces and within the myotomes. The mononucleated cells, situated in the myotomes, first express desmin in their cytoplasm and then Pax-7 (paired-box protein) in their nuclei. Expression of desmin indicates that they will enter myogenic pathway, whereas expression of Pax-7 suggests their role of satellite cells. We assume that mononucleated intramyotomal cells are myogenic precursors involved in muscle growth. In advanced (post-hatching) stages of myogenesis, myotomes contain both primary and new muscle fibres. Morphometric analyses show that in Pterophyllum scalare, growth of muscle fibres is mainly a result of hypertrophy. © 2011 Blackwell Verlag GmbH.

  9. Description of males of Phallotorynus pankalos Lucinda, Rosa & Reis, 2005 and reappraisal of Phallotorynus species relationships (Teleostei: Cyprinodontiformes: Poeciliidae

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    Paulo H. F. Lucinda

    Full Text Available Recently discovered male specimens of Phallotorynus pankalos are described and diagnosed from males of congener species on the basis of gonopodial morphology, color pattern and number of dorsal and anal-fin rays. The phylogenetic hypothesis of relationships among Phallotorynus species is reappraised with the inclusion of P. pankalos. Phallotorynus pankalos is hypothesized as sister to P. jucundus, a clade sister to P. victoriae or to a clade composed of P. dispilos and P. psittakos. Biogeography of Phallotorynus species is discussed, and it is suggested: (1 an early basal split between the rio Paraíba do Sul drainage and the Paraná-Paraguay system, separating P. fasciolatus from the ancestor of the remaining Phallotorynus species followed by a dispersal to rio Paraíba do Sul; (2 that the formation of the Sete Quedas falls may have isolated the ancestors of P. psittakos and P. dispilos. However, the sequence of events associated with the evolutionary history of Phallotorynus remains unclear and unsatisfactory.

  10. Abundance and behavioural ecology of the blenny Ophioblennius trinitatis (Teleostei: Blenniidae at an oceanic archipelago of Brazil (Atlantic

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    Paulo R. Medeiros

    2014-06-01

    Full Text Available Local patterns of fish density, microhabitat use, feeding behaviour, bite rate, territory area and agonistic interactions were recorded for Ophioblennius trinitatis at an oceanic archipelago (southwestern Atlantic. Rugosity, number of crevices and benthic diversity positively predicted the distribution of O. trinitatis. Turf algae was the preferred food item at all sites, but given its high availability inside and outside territory boundaries, it did not seem to be a limiting factor on the density of this blenny, as opposed to substrate heterogeneity. Bite rate was higher in the afternoon and for smaller individuals (juveniles. Territory size showed local variation and, although larger territories may be an effect of density-dependent conditions (more available space in low-density areas, we propose that individuals expand territories to compensate for residing in areas of lower quality (i.e. of low structural complexity. Larger individuals defended larger territories and residents responded differently to intruders, with higher rates of agonistic interactions towards potential competitors. Higher agonistic rates were also observed in larger territories and at low-complexity sites.

  11. Embryonic and larval development of Jundiá (Rhamdia quelen, Quoy & Gaimard, 1824, Pisces, Teleostei, a South American Catfish

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    C. R. Pereira

    Full Text Available The jundiá (Rhamdia quelen, Quoy & Gaimard is an endemic South American fish species. Because this species supports cold winters and grows faster during warm months, it has begun to be viewed as an ideal species for fish production in southern South America. In the present study, jundiá oocytes used were obtained by extrusion from females after hormone injection. Soon after hydration, the eggs were transferred to 50 L conic glass incubators, with constant and controlled water influx. Samples of fertilized eggs were transferred to Petri dishes and, examined under a stereoscopic microscope, were spherical, demersal, and non-adhesive with defined perivitelline space and resistant chorion. Cleavage stages occurred during the first 3.5 h. After hatching, larvae were transferred to 200 L glass fiber incubators. First signs of embryo movement were observed 21 h after fertilization; larval eclosion occurred 30.5 h after fertilization. Present findings may provide a basis for studies aimed at determining the complete ontogeny of jundiá and may be useful in eco-toxicological studies.

  12. On Gonorynchus, Gonorhynchus, Gonorinchus, Gonorhinchus and Gonorrhynchus, and some other names of labeonine fishes (Teleostei: Gonorynchidae and Cyprinidae).

    Science.gov (United States)

    Kottelat, Maurice

    2016-10-25

    The supposed cyprinid genus 'Gonorhynchus McClelland, 1838' does not exist; the name refers to Gonorhynchus Cuvier, 1816, which is a junior objective synonym of Gonorynchus Scopoli, 1777. The correct family-group name, authorship and date are: Gonorynchidae Fowler, 1941 (1848). Tariqilabeo Mirza & Saboohi, 1990 is the valid genus name for the South Asian species earlier placed in Crossocheilus or 'Gonorhynchus'. The family-group names Garrae Bleeker, 1863 and Labeonini Bleeker, 1859 are declared nomina protecta and Platycarinae Macleay, 1841 is declared nomen oblitum.

  13. Growth parameters estimates of Maurolicus stehmanni Parin & Kobyliansky 1996 (Teleostei, Sternoptichydae from south and southeastern Brazilian waters

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    Andre Bellucco

    2004-12-01

    Full Text Available This paper on the otolith microstructure analysis of Maurolicus stehmanni presents estimates of the species growth parameters and longevity. The species inhabits the outer shelf and slope of the southern and southeastern Brazilian Exclusive Economic Zone (EEZ. Growth parameters are important for the knowledge of the species' life history and rational management. M. stehmanni constitutes an important link between the initial and final components of the alimentary chain of the open sea ecosystem, being one of the main food items for squids and large pelagic fish. Among the various applied methods those which presented the most coherent values for growth parameters and were best adapted to the von Bertallanfy's equation were: Li= 55mm K= 0.0088/day and to= 5.5 days Maurolicus stehmanni's longevity is of less than one year (around 220 days and the sagita daily otolith rings are useful for the determination of its age.Este estudo, baseado na análise da microestrutura dos otólitos de Maurolicus stehmanni, apresenta estimativas dos parâmetros de crescimento e longevidade para esta espécie que habita a plataforma externa e o talude da ZEE sul-sudeste do Brasil. Estes parâmetros são importantes para o conhecimento da estratégia de vida da espécie e para o manejo deste recurso, que constitui um importante elo entre os componentes iniciais e finais da teia alimentar no ecossistema de mar aberto, sendo um dos principais itens na dieta das lulas e grandes peixes pelágicos. Dentre os vários métodos aplicados, os valores dos parâmetros de crescimento mais coerentes com a estratégia da espécie e que melhor se ajustaram à equação de von Bertallanfy foram: Li= 55mm K= 0.0088/dia e to= 5.5 dias. A espécie vive cerca de 220 dias e as marcas diárias nos otólitos sagita são apropriadas para a determinação da idade.

  14. Cryptic clonal lineages and genetic diversity in the loach Misgurnus anguillicaudatus (Teleostei: Cobitidae) inferred from nuclear and mitochondrial DNA analyses.

    Science.gov (United States)

    Morishima, Kagayaki; Nakamura-Shiokawa, Yuka; Bando, Etsuko; Li, Ya-Juan; Boroń, Alicja; Khan, Md Mukhlesur Rahman; Arai, Katsutoshi

    2008-02-01

    In the loach Misgurnus anguillicaudatus, the asexual lineage, which produces unreduced clonal diploid eggs, has been identified. Among 833 specimens collected from 54 localities in Japan and two localities in China, 82 candidates of other lineage(s) of cryptic clones were screened by examining RFLP (restriction fragment length polymorphism)-PCR haplotypes in the control region of mtDNA. This analysis was performed because triploid loaches arise from the accidental incorporation of the sperm nucleus into unreduced diploid eggs of a clone. The categorization of members belonging to three newly identified lineages (clones 2-4) and the previously identified clonal lineage (clone 1) was verified by evaluating the genetic identity between two or more individuals from each clonal lineage based on RAPD (random amplified polymorphic DNA)-PCR and multilocus DNA fingerprints. We detected 75 haplotypes by observing the nucleotide status at variable sites from the control region of mtDNA. Phylogenic trees constructed from such sequences showed two highly diversified clades, A and B, that were beyond the level common for interspecific genetic differentiation. That result suggests that M. anguillicaudatus in Japan is not a single species entity. Two clone-specific mtDNA sequences were included in clade A, and the loaches with such sequences may be the maternal origin of the clones.

  15. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae), from the Iberian Peninsula

    Science.gov (United States)

    Nabais, Catarina; Rampin, Massimiliano; Collares-Pereira, Maria João

    2013-01-01

    Abstract In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3)-fluorescence, Silver-impregnation (Ag-NORs)) and molecular (fluorescence in situ hybridization (FISH) with 18S rDNA probe) protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species. PMID:24260688

  16. A quantitative description of the reproductive biology of the Mediterranean blenny Aidablennius sphynx (Teleostei, Blenniidae) in its natural habitat

    NARCIS (Netherlands)

    Kraak, SBM

    This paper describes the reproductive behaviour of Aidablennius sphynx, which was studied in the field during four breeding seasons. Artificial nest sites were used for the determination of nest contents. The breeding season started at the end of April, when water temperature had just reached 14-15

  17. A new species of sea urchin associating clingfish of the genus Dellichthys from New Zealand (Teleostei, Gobiesocidae

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    Kevin W. Conway

    2018-02-01

    Full Text Available A new species of clingfish, Dellichthys trnskii sp. n. is described on the basis of 27 specimens, 11.9–46.0 mm SL, collected from intertidal and shallow coastal waters of New Zealand. It is distinguished from its only congener, D. morelandi Briggs, 1955 by characters of the cephalic sensory system and oral jaws, snout shape, and colouration in life. A rediagnosis is provided for D. morelandi, which is shown to exhibit sexual dimorphism in snout shape.

  18. Reproductive biology of Ilisha elongata (Teleostei: Pristigasteridae) in Ariake Sound, Japan: Implications for estuarine fish conservation in Asia

    Science.gov (United States)

    Zhang, Jie; Takita, Toru; Zhang, Chunguang

    2009-01-01

    Elongate ilisha ( Ilisha enlongata) is a commercially important species that contributes to clupeoid fisheries in Asian countries. In the present study, the reproductive biology of I. elongata in Ariake Sound, Japan is determined for the first time. Six maturity stages were described using ovarian and testicular histology throughout the annual cycle. The spawning season in Ariake Sound lasts from May to July, with peak spawning activity in May and June. Age at first maturity was estimated to be 2 years, with a few exceptions of 1 year in well-developed males. Ovaries that contained both tertiary yolk oocytes and postovulatory follicles occurred from late May to late July, indicating that I. elongata is a multiple spawner. The size-frequency distribution of oocytes provided evidence for its multiple spawning and accuracy of the fecundity estimates. The batch fecundity of this species was estimated at between 22,200 and 270,900 eggs per individual, increasing with age between two and six years. The present findings on the reproductive strategy of I. elongata in Ariake Sound are generally consistent with those in temperate or subtropical populations, but quite different from those of tropical population where first maturation occurs around 200 days and life spans are shorter, with a maximum age less than 3 years. The conservation implications of this reproductive strategy in a harsh, variable environment in Asian countries are also discussed.

  19. Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes

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    Thiago Scremin Boscolo Pereira

    Full Text Available In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36 were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.

  20. Mapping the potential distribution of the invasive Red Shiner, Cyprinella lutrensis (Teleostei: Cyprinidae) across waterways of the conterminous United States

    Science.gov (United States)

    Poulos, Helen M.; Chernoff, Barry; Fuller, Pam L.; Butman, David

    2012-01-01

    Predicting the future spread of non-native aquatic species continues to be a high priority for natural resource managers striving to maintain biodiversity and ecosystem function. Modeling the potential distributions of alien aquatic species through spatially explicit mapping is an increasingly important tool for risk assessment and prediction. Habitat modeling also facilitates the identification of key environmental variables influencing species distributions. We modeled the potential distribution of an aggressive invasive minnow, the red shiner (Cyprinella lutrensis), in waterways of the conterminous United States using maximum entropy (Maxent). We used inventory records from the USGS Nonindigenous Aquatic Species Database, native records for C. lutrensis from museum collections, and a geographic information system of 20 raster climatic and environmental variables to produce a map of potential red shiner habitat. Summer climatic variables were the most important environmental predictors of C. lutrensis distribution, which was consistent with the high temperature tolerance of this species. Results from this study provide insights into the locations and environmental conditions in the US that are susceptible to red shiner invasion.

  1. The description of Austroglossus pectoralis (Teleostei: Soleidae larvae from the South-east coast of South Africa

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    Aidan D. Wood

    2000-12-01

    Full Text Available Preflexion and flexion larval stages of the East coast sole Austroglossus pectoralis are described. Larval morphology was consistent with that of other soleids. The yolk-sac was evident in larvae up to 2.9 mm BL. Flexion is evident in some 3.5 mm BL larvae and in all larvae > 3.8 mm BL. Larvae have 50 to 58 (8-10 + 40-49 myomeres and a large protruding gut. The head profile is rounded initially and becomes convex after flexion. Teeth are present at 4.0 mm BL and are initially robust, becoming elongate and incisor-shaped after flexion. Pectoral fins are present but no rays have developed in the largest specimen. The sequence of fin anlagen development is caudal, dorsal and anal. Eye migration is not evident in the largest (8.8 mm BL specimen examined. Pigment is evident over the fore- and mid-brain, snout and lower jaw, and along the ventral and dorsal midline of the trunk and tail. The ventral and lateral walls of the gut also bear melanophores. The larvae of A. pectoralis are compared with previously described soleid species which are found in southern African waters, including its congeneric A. microlepis.

  2. Phylogenetic analysis of the order Pleuronectiformes (Teleostei based on sequences of 12S and 16S mitochondrial genes

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    Marisa F.C. Azevedo

    2008-01-01

    Full Text Available The fish order Pleuronectiformes, composed of 14 families, has two suborders: Psettodoidei (with one family and Pleuronectoidei (with thirteen families. The relationships among families of Pleuronectoidei and among the genera of their families have extensively been debated and a consensus has not yet been reached. In the present study, partial sequences of the 12S and 16S mitochondrial rRNA genes were obtained from 19 species belonging to the families Achiridae, Bothidae, Cynoglossidae, Paralichthyidae, Pleuronectidae, Scophthalmidae, and Soleidae. Additional sequences of 42 pleuronectiform species were obtained from GenBank. Phylogenetic analyses were conducted by the methods of maximum-parsimony, maximum-likelihood and Bayesian inference. Our results corroborate the monophyletic status of all families, excluding Paralichthyidae. In the family Achiridae, the genus Catathyridium (freshwater was the sister group of Trinectes (saltwater, and Hypoclinemus (freshwater was the sister group of Achirus (saltwater. Assuming that the putative ancestor of achirids lived in saltwater, it is suggested that the freshwater habitats in South America were colonized independently by different achirid lineages.

  3. Molecular systematics of the New World clingfish genus Gobiesox (Teleostei: Gobiesocidae) and the origin of a freshwater clade.

    Science.gov (United States)

    Conway, Kevin W; Kim, Daemin; Rüber, Lukas; Espinosa Pérez, Héctor S; Hastings, Philip A

    2017-07-01

    The phylogenetic relationships between marine and freshwater members of the New World clingfish genus Gobiesox are investigated using both mitochondrial and nuclear sequence data. Phylogenetic hypotheses are derived from Bayesian and maximum parsimony analyses of a six-gene concatenated data set (2 mitochondrial and 4 nuclear markers; 4098bp). Gobiesox is paraphyletic, due to the inclusion of Pherallodiscus, in phylogenetic hypotheses resulting from all analyses and its two included species are reassigned to Gobiesox. Within the expanded genus Gobiesox, the freshwater species (G. cephalus, G. juradoensis, G. mexicanus and G. potamius) represent a monophyletic group that is nested inside of a paraphyletic marine group. Based on the monophyly of the freshwater clingfishes, a habitat transition from marine to freshwater is inferred to have occurred only once in the evolutionary history of the group (potentially in the mid-Miocene). Gobiesox is obtained as part of a larger clade of New World clingfishes, including also members of Acyrtops, Acyrtus, Arcos, Rimicola, Sicyases and Tomicodon equivalent to the subfamily Gobiesocinae. The phylogenetic hypotheses obtained are discussed briefly in relation to the two alternative classifications currently in use simultaneously for the Gobiesocidae. A rediagnosis and list of included species is provided for Gobiesox. Copyright © 2017 Elsevier Inc. All rights reserved.

  4. Pseudempleurosoma haywardi sp. nov. (Monogenea: Ancyrocephalidae (sensu lato Bychowsky & Nagibina, 1968: An endoparasite of croakers (Teleostei: Sciaenidae from Indonesia.

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    Stefan Theisen

    Full Text Available An endoparasitic monogenean was identified for the first time from Indonesia. The oesophagus and anterior stomach of the croakers Nibea soldado (Lacépède and Otolithes ruber (Bloch & Schneider (n = 35 each sampled from the South Java coast in May 2011 and Johnius amblycephalus (Bleeker (n = 2 (all Sciaenidae from Kedonganan fish market, South Bali coast, in November 2016, were infected with Pseudempleurosoma haywardi sp. nov. Prevalences in the first two croakers were 63% and 46%, respectively, and the two J. amblycephalus harboured three and five individuals. All three croakers represent new hosts for this monogenean genus. We provide infection rates, light microscopical observations, 3D confocal microscopical illustrations, and a morphometric comparison with all congeners. The new species differs in body size, the position and shape of the ovary and testes, and especially in the composition of the dorsal anchor complex, with the dorsal bar being anteriorly concave rather than planar or convex as in its congeners. The dorsal and ventral anchors of this new species are the longest in the genus, whereas the male copulatory organ is the smallest. The first DNA sequences for a member of this genus demonstrate the greatest similarity with endoparasitic freshwater monogeneans from African cichlid fishes. This suggests a freshwater origin for these marine endoparasitic monogeneans.

  5. Pseudempleurosoma haywardi sp. nov. (Monogenea: Ancyrocephalidae (sensu lato) Bychowsky & Nagibina, 1968): An endoparasite of croakers (Teleostei: Sciaenidae) from Indonesia.

    Science.gov (United States)

    Theisen, Stefan; Palm, Harry W; Al-Jufaili, Sarah H; Kleinertz, Sonja

    2017-01-01

    An endoparasitic monogenean was identified for the first time from Indonesia. The oesophagus and anterior stomach of the croakers Nibea soldado (Lacépède) and Otolithes ruber (Bloch & Schneider) (n = 35 each) sampled from the South Java coast in May 2011 and Johnius amblycephalus (Bleeker) (n = 2) (all Sciaenidae) from Kedonganan fish market, South Bali coast, in November 2016, were infected with Pseudempleurosoma haywardi sp. nov. Prevalences in the first two croakers were 63% and 46%, respectively, and the two J. amblycephalus harboured three and five individuals. All three croakers represent new hosts for this monogenean genus. We provide infection rates, light microscopical observations, 3D confocal microscopical illustrations, and a morphometric comparison with all congeners. The new species differs in body size, the position and shape of the ovary and testes, and especially in the composition of the dorsal anchor complex, with the dorsal bar being anteriorly concave rather than planar or convex as in its congeners. The dorsal and ventral anchors of this new species are the longest in the genus, whereas the male copulatory organ is the smallest. The first DNA sequences for a member of this genus demonstrate the greatest similarity with endoparasitic freshwater monogeneans from African cichlid fishes. This suggests a freshwater origin for these marine endoparasitic monogeneans.

  6. Pseudempleurosoma haywardi sp. nov. (Monogenea: Ancyrocephalidae (sensu lato) Bychowsky & Nagibina, 1968): An endoparasite of croakers (Teleostei: Sciaenidae) from Indonesia

    OpenAIRE

    Stefan Theisen; Harry W Palm; Al-Jufaili, Sarah H.; Sonja Kleinertz

    2017-01-01

    An endoparasitic monogenean was identified for the first time from Indonesia. The oesophagus and anterior stomach of the croakers Nibea soldado (Lacépède) and Otolithes ruber (Bloch & Schneider) (n = 35 each) sampled from the South Java coast in May 2011 and Johnius amblycephalus (Bleeker) (n = 2) (all Sciaenidae) from Kedonganan fish market, South Bali coast, in November 2016, were infected with Pseudempleurosoma haywardi sp. nov. Prevalences in the first two croakers were 63% and 46%, respe...

  7. Occurrence and ultrastructural characterization of "nuage" during oogenesis and early spermatogenesis of Piaractus mesopotamicus Holmberg, 1887 (Teleostei

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    F. C. Abdalla

    Full Text Available We investigated the occurrence and ultrastructurally characterized electrondense nuclear material (nuage released from the nucleus during oogenesis and early spermatogenesis of Piaractus mesopotamicus, a fish from Pantanal Matogrossense (Brazil having a seasonal reproductive cycle. The female germ cells presented two instances of nuclear material extrusion: in the oogonia and in the oocyte in the perinucleolar phase. In males, material with similar morphology and behavior occurred in the spematogonia. In all cases, this material was associated to mitochondria. The possible function of this material is discussed.

  8. Oogenesis: From Oogonia to Ovulation in the Flagfish, Jordanella floridae Goode and Bean, 1879 (Teleostei: Cyprinodontidae).

    Science.gov (United States)

    Uribe, Mari Carmen; Grier, Harry J; García-Alarcón, Adriana; Parenti, Lynne R

    2016-10-01

    We provide histological details of the development of oocytes in the cyprinodontid flagfish, Jordanella floridae. There are six stages of oogenesis: Oogonial proliferation, chromatin nucleolus, primary growth (previtellogenesis [PG]), secondary growth (vitellogenesis), oocyte maturation and ovulation. The ovarian lamellae are lined by a germinal epithelium composed of epithelial cells and scattered oogonia. During primary growth, the development of cortical alveoli and oil droplets, are initiated simultaneously. During secondary growth, yolk globules coalesce into a fluid mass. The full-grown oocyte contains a large globule of fluid yolk. The germinal vesicle is at the animal pole, and the cortical alveoli and oil droplets are located at the periphery. The disposition of oil droplets at the vegetal pole of the germinal vesicle during late secondary growth stage is a unique characteristic. The follicular cell layer is composed initially of a single layer of squamous cells during early PG which become columnar during early vitellogenesis. During primary and secondary growth stages, filaments develop among the follicular cells and also around the micropyle. The filaments are seen extending from the zona pellucida after ovulation. During ovulation, a space is evident between the oocyte and the zona pellucida. Asynchronous spawning activity is confirmed by the observation that, after ovulation, the ovarian lamellae contain follicles in both primary and secondary growth stages; in contrast, when the seasonal activity of oogenesis and spawning ends, after ovulation, the ovarian lamellae contain only follicles in the primary growth stage. J. Morphol. 277:1339-1354, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  9. Protogrammus alboranensis n. sp. (Teleostei: Callionymidae, a new species of dragonet from the Alboran Sea, western Mediterranean Sea

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    Carlos Farias

    2016-03-01

    Full Text Available Protogrammus alboranensis n. sp. is described on the basis of four specimens from the Alboran Sea, western Mediterranean Sea. It is characterized within the genus Protogrammus by a total of nine unbranched rays on the second dorsal fin, eight unbranched rays on the anal fin, a very small preopercular spine with an upcurved main tip and one point on the dorsal margin, which is lacking an antrorse spine at the base, the first and second spines of the first dorsal fin filamentous and much longer than the first ray of the second dorsal fin in males, the tip of the last ray of the second dorsal fin reaching beyond the caudal fin base in males, and the anal fin distally black in the males (translucent in females. A key to the species of Protogrammus is presented; the zoogeography of the species is discussed.

  10. A southern species of the tropical catfish genus Phractocephalus (Teleostei: Siluriformes) in the Miocene of South America

    Science.gov (United States)

    Azpelicueta, María de las Mercedes; Cione, Alberto Luis

    2016-04-01

    Catfish bones from Tortonian (Miocene) freshwater beds of central Argentina are here identified as pertaining to a new species of the tropical pimelodid genus Phractocephalus. The new species differs from the other recent and fossil species of the genus in skull, pectoral girdle and spine characters. The material was found in different localities near the city of Paraná, Entre Ríos Province. The bearing horizon is the so-called "Conglomerado osífero" which constitutes the lowermost beds of the fluvial Ituzaingó Formation. The aquatic vertebrate fauna occurring in the bearing bed shows a similar generic composition to several northern South American Miocene units where Phractocephalus remains were found. This report extends the range of Phractocephalus more than 2000 km to the South. The record is in agreement with higher global temperatures and putative ample hydrographic connections of the river basins in the Paraná area with the Amazon basin until at least the early late Miocene.

  11. Estudos ultraestruturais da glândula de Mehlis de Metamicrocotyla macracantha (Monogenea, Microcotylidae parasito de Mugil liza (Teleostei

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    Maria de Fatima Diniz Baptista Farias

    2005-10-01

    Full Text Available The ultrastructure of Mehlis' gland of Metamicrocotyla macracantha, a gill parasite collected from Mugil liza from Rio de Janeiro, Brazil, was studied by transmission electron microscopy. The Mehlis' gland consists of two types of secretory cells, S1 and S2, each producing a different secretory body. The S1 bodies are spherical, lamellae-like and were observed in different stages of development in the cytoplasm of these cells. The S2 bodies are spherical to ovoid with dense content, showing a crystalline structure. The cytoplasm of Mehlis' gland cells contains also free ribosomes, granular endoplasmatic reticulum and Golgi complex, characteristic organelles of secretory cells.

  12. Additional record of Batasio merianiensis (Chaudhuri 1913, a catfish (Teleostei: Bagridae in upper Brahmaputra River drainage in Arunachal Pradesh, India

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    L. Tamang

    2014-05-01

    Full Text Available This paper communicates the extension of the distribution range of Batasio merianiensis in Sille River in the upper Brahmaputra drainage, East Siang District, Arunachal Pradesh. Detailed examinations of the specimens revealed existence of few morphological variations against those reported by Heok Hee Ng in 2009 on the following characteristics: by having a longer preanal (70.4-73.4 vs. 66.3-68.2% SL; a longer prepectoral (25.1-29.3 vs. 21.4-25.7% SL; a longer adipose-fin base (22.0-27.6 vs. 16.9-22.2% SL; a shorter post-adipose distance (11.6-13.4 vs.13.4-15.5% SL; a deeper body at anus (depth 18.3-20.8 vs.15.2-18.4% SL and broader head (width 17.6-20.0 vs.13.5-16.2 % HL. Few additional characters of the fish are included along with brief information on its habitat. The LIPUM, the semi-traditional method of fishing in the river is identified as a major threat to this species.

  13. Rediscovery of the syntypes of Corydoras meridionalis R. von Ihering, 1911 (Teleostei, Siluriformes, Callichthyidae and designation of lectotype

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    Heraldo A. Britski

    2010-01-01

    Full Text Available Syntypes of Corydoras meridionalis Rodolpho von Ihering, 1911, once regarded as lost, were recently found in the collection of fishes of the Museu de Zoologia da USP. The syntypes had been identified as C. ehrhardti Steindachner, 1910, currently considered a senior synonym of that species. Examination of the rediscovered syntypes corroborates the proposed synonymy. Data on the syntypes are presented and compared with information in the original descriptions of C. ehrhardti and C. meridionalis; a few discrepancies found are discussed. A lectotype is designated for C. meridionalis and a photograph of the specimen is provided.Os síntipos de Corydoras meridionalis Rodolpho von Ihering, 1911, tidos como desaparecidos da coleção de peixes do Museu de Zoologia da USP, foram encontrados; os exemplares tinham sido identificados como C. ehrhardti Steindachner, 1910, espécie atualmente considerada sinônimo sênior da primeira. O exame desses sintipos permite confirmar a sinonímia proposta. Dados sobre os síntipos são apresentados e comparados com os dados das descrições originais de C. ehrhardti e C. meridionalis, sendo comentadas as poucas diferenças encontradas entre eles. É designado o lectótipo de C. meridionalis e uma fotografia deste é apresentada.

  14. Morphology-based phylogeny of the suckermouth armored catfishes, with emphasis on the Neoplecostominae (Teleostei: Siluriformes: Loricariidae).

    Science.gov (United States)

    Pereira, Edson H L; Reis, Roberto E

    2017-05-11

    A phylogenetic study of the Loricariidae with emphasis on the Neoplecostominae is presented based on a maximum parsimony analysis of 268 phenotypic characters encompassing osteology, arthrology, and external morphology. Results support previous hypotheses of the monophyly of the Neoplecostominae and each of the included genera: Hirtella, Isbrueckerichthys, Kronichthys, Neoplecostomus, Pareiorhaphis, and Pareiorhina. In addition, previously undiscovered diversity was revealed within the subfamily as an additional genus-level taxon, herein described as Euryochus. Relationships among neoplecostomine genera are: (Kronichthys (Euryochus ((Hirtella + Pareiorhaphis) (Pareiorhina (Isbrueckerichthys + Neoplecostomus))))). Additional undescribed diversity was also detected among most neoplecostomine genera and the Hypoptopomatinae. In addition, recently discovered genera Nannoplecostomus and Microplecostomus were included in the analysis, and were identified as sequential sister-taxa to Neoplecostominae + Hypoptopomatinae, which are currently not included in any subfamily and regarded as incertae sedis in Loricariidae. The three species of Lithogenes were included in an encompassing phylogenetic analysis for the first time, and were identified as a monophyletic unit and sister group to all remaining loricariids. The other loricariid subfamilies were also corroborated as monophyletic, and presented the following interrelationships (Lithogeninae (Delturinae (Loricariinae (Hypostominae (Nannoplecostomus (Microplecostomus (Hypoptopomatinae + Neoplecostominae). The Neoplecostominae and its genera are phylogenetically diagnosed, and hypothesized relationships are compared to those of previous morphological and molecular phylogenetic studies.

  15. Evolutionary history of Otophysi (Teleostei), a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation

    Science.gov (United States)

    2011-01-01

    Background Freshwater harbors approximately 12,000 fish species accounting for 43% of the diversity of all modern fish. A single ancestral lineage evolved into about two-thirds of this enormous biodiversity (≈ 7900 spp.) and is currently distributed throughout the world's continents except Antarctica. Despite such remarkable species diversity and ubiquity, the evolutionary history of this major freshwater fish clade, Otophysi, remains largely unexplored. To gain insight into the history of otophysan diversification, we constructed a timetree based on whole mitogenome sequences across 110 species representing 55 of the 64 families. Results Partitioned maximum likelihood analysis based on unambiguously aligned sequences (9923 bp) confidently recovered the monophyly of Otophysi and the two constituent subgroups (Cypriniformes and Characiphysi). The latter clade comprised three orders (Gymnotiformes, Characiformes, Siluriformes), and Gymnotiformes was sister to the latter two groups. One of the two suborders in Characiformes (Characoidei) was more closely related to Siluriformes than to its own suborder (Citharinoidei), rendering the characiforms paraphyletic. Although this novel relationship did not receive strong statistical support, it was supported by analyzing independent nuclear markers. A relaxed molecular clock Bayesian analysis of the divergence times and reconstruction of ancestral habitats on the timetree suggest a Pangaean origin and Mesozoic radiation of otophysans. Conclusions The present timetree demonstrates that survival of the ancestral lineages through the two consecutive mass extinctions on Pangaea, and subsequent radiations during the Jurassic through early Cretaceous shaped the modern familial diversity of otophysans. This evolutionary scenario is consistent with recent arguments based on biogeographic inferences and molecular divergence time estimates. No fossil otophysan, however, has been recorded before the Albian, the early Cretaceous 100-112 Ma, creating an over 100 million year time span without fossil evidence. This formidable ghost range partially reflects a genuine difference between the estimated ages of stem group origin (molecular divergence time) and crown group morphological diversification (fossil divergence time); the ghost range, however, would be filled with discoveries of older fossils that can be used as more reasonable time constraints as well as with developments of more realistic models that capture the rates of molecular sequences accurately. PMID:21693066

  16. Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard (Teleostei: Siluriformes, throughout their reproductive cycle

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    Rodrigo Vargas Anido

    Full Text Available Knowledge about gonad fatty acid composition is important for broodstock diet formulation. This study characterized ovary fatty acid composition of wild female jundiá catfish (Rhamdia quelen in their different gonadal maturation stages. Female jundiá (n = 36, average weight= 383.8 + 208.8 g were captured in the rio Uruguay, comprising all seasons. Ovaries were extracted and classified according to their gonadal maturation stage. Gonad-somatic ratio varied significantly among seasons, being higher in spring (3.7, followed by summer (2.2, winter (0.9 and autumn (0.6. Main fatty acids groups detected were: saturated (SFA= 35.5%, monounsaturated (MUFA= 28.1% and polyunsaturated fatty acids (PUFA= 33.5%. Over the four seasons, palmitic acid was recorded in large quantities, followed by docosahexaenoic acid (DHA and arachidonic acid (ARA. ARA was present in higher concentrations in immature or maturing ovaries, and its content decreased along the maturation process. Conversely, DHA and eicosapentaenoic acid (EPA contents increased during maturation. Such variation resulted in an increase in EPA/ARA and DHA/ARA ratios in mature gonads, which can be important for successful breeding. Such findings suggest that jundiá broodstock diets should contain lipids that provide long chain polyunsaturated fatty acids from both the n-3 and n-6 series to ensure gonadal maturation completion.

  17. Comparative morphology of the gonadal structure related to reproductive strategies in six species of neotropical catfishes (Teleostei: Siluriformes).

    Science.gov (United States)

    Melo, Rafael Magno Costa; Arantes, Fábio Pereira; Sato, Yoshimi; dos Santos, José Enemir; Rizzo, Elizete; Bazzoli, Nilo

    2011-05-01

    We studied the relationship between the morphology of the reproductive system and the reproductive strategies of six neotropical catfishes using macroscopic and microscopic analyses. The reproductive system of the examined Siluriformes showed diversified characteristics, but permitted their being grouped according to three reproductive strategies: pelagic spawning, demersal spawning, and internally fertilizing. The pelagic spawners Pseudoplatystoma corruscans and Conorhynchos conirostris have testes that are characterized by filiform lobes, absence of testicular secretion, full-grown oocytes of small diameter, thin zona radiata, and cuboidal follicular cells. Pimelodus maculatus is morphologically distinct from the other two pelagic spawners catfishes due to the presence of testicular secretion. The demersal spawners Lophiosilurus alexandri and Rhinelepis aspera possess homogeneous testicular secretion, large mature oocytes, and columnar follicular cells. The most specialized reproductive system was observed in the internally fertilizing Trachelyopterus galeatus, which possesses a seminal vesicle accessory to the testes, spermatozoa with elongated nuclei that form spermatozeugmata, and a secretory ovarian lamellar epithelium that is associated with sperm storage. The reproductive system observed in Neotropical catfishes showed a relationship associated with the type of fertilization and the reproductive strategies of the six species studied. Copyright © 2011 Wiley-Liss, Inc.

  18. A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences.

    Science.gov (United States)

    Sullivan, John P; Lundberg, John G; Hardman, Michael

    2006-12-01

    Higher-level relationships among catfishes were investigated by parsimony, maximum likelihood and Bayesian analyses of two nuclear genes across 110 catfish species representing 36 of 37 families and Conorhynchos (family incertae sedis). Analysis of 3660 aligned base pairs from the rag1 and rag2 genes confirms monophyly of Siluriformes, of most siluriform families and of a number of multifamily groups, some recognized, some novel. South American Loricarioidei are recovered as the sistergroup to other catfishes which are divided into Diplomystidae and Siluroidei. This result contrasts with the prevailing hypothesis that Diplomystidae is the sister to all other catfishes. Monophyly of Siluroidei is supported by rag data including a unique three-codon deletion from rag1. Deep within Siluroidei are 12 large, strongly supported groups with poorly resolved interrelationships. Five are single families: Cetopsidae, Plotosidae, Chacidae, Siluridae and Pangasiidae. Four others are monophyletic taxa ranked here as superfamilies: Clarioidea (Clariidae, Heteropneustidae), Arioidea (Ariidae, Anchariidae), Pimelodoidea (Pimelodidae, Pseudopimelodidae, Heptapteridae, Conorhynchos), Ictaluroidea (Ictaluridae, Cranoglanididae). South American Doradoidea (Doradidae, Auchenipteridae) and Aspredinidae are a sistergroup pair. Sisoroidea (without Aspredinidae), Ailia+Laides, Horabagridae, and Bagridae (without Rita) form a large, predominantly Asian clade, "Big Asia." Mochokidae, Malapteruridae, Amphiliidae, Claroteidae, and African schilbids are united as a species-rich African clade, "Big Africa." The three large continental clades, "Big Asia," "Big Africa" and Neotropical Loricarioidei suggest a prevalence of intracontinental diversification of catfishes. South America is the home of the Gymnotiformes, putative sistergroup of catfishes, plus two of the deepest siluriform clades, Loricarioidei and Diplomystidae, thus suggesting an ancient siluriform presence if not origin there. The rag phylogeny does not identify any African-South American catfish clade. The well-known African-Asian relationships within families Clariidae and Bagridae are confirmed, as is the recently found North American-Asian relationship between Ictaluridae and Cranoglanididae.

  19. Leptobotia bellacauda, a new species of loach from the lower Yangtze basin in China (Teleostei: Cypriniformes: Botiidae)

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Šlechtová, Vendula

    2016-01-01

    Roč. 4205, č. 1 (2016), s. 65-72 ISSN 1175-5326 R&D Projects: GA ČR GA13-37277S Institutional support: RVO:67985904 Keywords : morphology * taxonomy * Anhui Subject RIV: EG - Zoology Impact factor: 0.972, year: 2016

  20. A Ploidy Difference Represents an Impassable Barrier for Hybridisation in Animals. Is There an Exception among Botiid Loaches (Teleostei: Botiidae)?

    Czech Academy of Sciences Publication Activity Database

    Bohlen, Jörg; Šlechtová, Vendula; Šlechta, Vlastimil; Šlechtová, Věra; Sember, Alexandr; Ráb, Petr

    2016-01-01

    Roč. 11, č. 7 (2016), e0159311-e0159311 E-ISSN 1932-6203 R&D Projects: GA ČR GA13-37277S Institutional support: RVO:67985904 Keywords : molecular phylogeny * genetic data Subject RIV: EG - Zoology Impact factor: 2.806, year: 2016

  1. General characteristics of the diet of Trachinotus paitensis (Teleostei: Carangidae) from San Ignacio Lagoon, Baja California Sur, Mexico.

    Science.gov (United States)

    Cruz Escalona, V H; Abitia Cárdenas, L A

    2004-03-01

    The food habits of Trachinotus paitensis, in San Ignacio Lagoon B.C.S., Mexico, were investigated. We observed that T. paitensis is carnivorous, feeding mainly on benthic invertebrates (the gastropods Anachis spp., Bittium spp., and the crustacean larvae). We concluded that T. paitensis is an opportunist predator that impacts mainly on epibenthic invertebrates.

  2. General characteristics of the diet of Trachinotus paitensis (Teleostei: Carangidae from San Ignacio Lagoon, Baja California Sur, Mexico

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    V.H. Cruz Escalona

    2004-03-01

    Full Text Available The food habits of Trachinotus paitensis, in San Ignacio Lagoon B.C.S., Mexico, were investigated. We observed that T. paitensis is carnivorous, feeding mainly on benthic invertebrates (the gastropods Anachis spp., Bittium spp., and the crustacean larvae. We concluded that T. paitensis is an opportunist predator that impacts mainly on epibenthic invertebratesFueron investigados los hábitos alimenticios de Trachinotus paitensis, en la laguna San Ignacio B.C.S., México. Se observó que T. paitensis es carnívoro, y se alimenta principalmente de invertebrados bénticos (los gastrópodos Anachis spp., Bittium spp., y larvas de crustáceos. En conclusión esta especie es un depredador oportunista que tiene un impacto principalmente sobre las poblaciones de invertebrados epibénticos

  3. Feeding habits of the convict surgeonfish Acanthurus triostegus (Teleostei: Acanthuridae) in the Los Frailes reef, B.C.S., Mexico

    OpenAIRE

    Abitia Cárdenas, Leonardo Andrés; Moreno Sánchez, Xchel Gabrie; Palacios-Salgado, Deivis Samuel; Escobar-Sánchez, Ofelia

    2011-01-01

    Studies of the feeding habits of reef-inhabiting herbivorous species are important since they are the first level in the trophic chain between primary producers and consumers. This study is the first contribution to determine the diet of the convict surgeonfish Acanthurus triostegus from the Los Frailes reef, Baja California Sur, Mexico. We describe qualitative and quantitatively the trophic spectrum of 50 A. triostegus individuals, using the traditional methods of frequency of occurrence and...

  4. An evaluation of fossil tip-dating versus node-age calibrations in tetraodontiform fishes (Teleostei: Percomorphaceae).

    Science.gov (United States)

    Arcila, Dahiana; Alexander Pyron, R; Tyler, James C; Ortí, Guillermo; Betancur-R, Ricardo

    2015-01-01

    Time-calibrated phylogenies based on molecular data provide a framework for comparative studies. Calibration methods to combine fossil information with molecular phylogenies are, however, under active development, often generating disagreement about the best way to incorporate paleontological data into these analyses. This study provides an empirical comparison of the most widely used approach based on node-dating priors for relaxed clocks implemented in the programs BEAST and MrBayes, with two recently proposed improvements: one using a new fossilized birth-death process model for node dating (implemented in the program DPPDiv), and the other using a total-evidence or tip-dating method (implemented in MrBayes and BEAST). These methods are applied herein to tetraodontiform fishes, a diverse group of living and extinct taxa that features one of the most extensive fossil records among teleosts. Previous estimates of time-calibrated phylogenies of tetraodontiforms using node-dating methods reported disparate estimates for their age of origin, ranging from the late Jurassic to the early Paleocene (ca. 150-59Ma). We analyzed a comprehensive dataset with 16 loci and 210 morphological characters, including 131 taxa (95 extant and 36 fossil species) representing all families of fossil and extant tetraodontiforms, under different molecular clock calibration approaches. Results from node-dating methods produced consistently younger ages than the tip-dating approaches. The older ages inferred by tip dating imply an unlikely early-late Jurassic (ca. 185-119Ma) origin for this order and the existence of extended ghost lineages in their fossil record. Node-based methods, by contrast, produce time estimates that are more consistent with the stratigraphic record, suggesting a late Cretaceous (ca. 86-96Ma) origin. We show that the precision of clade age estimates using tip dating increases with the number of fossils analyzed and with the proximity of fossil taxa to the node under assessment. This study suggests that current implementations of tip dating may overestimate ages of divergence in calibrated phylogenies. It also provides a comprehensive phylogenetic framework for tetraodontiform systematics and future comparative studies. Copyright © 2014 Elsevier Inc. All rights reserved.

  5. Comparative proteome and peptidome analysis of the cephalic fluid secreted by Arapaima gigas (Teleostei: Osteoglossidae) during and outside parental care.

    Science.gov (United States)

    Torati, Lucas S; Migaud, Hervé; Doherty, Mary K; Siwy, Justyna; Mullen, Willian; Mesquita, Pedro E C; Albalat, Amaya

    2017-01-01

    Parental investment in Arapaima gigas includes nest building and guarding, followed by a care provision when a cephalic fluid is released from the parents' head to the offspring. This fluid has presumably important functions for the offspring but so far its composition has not been characterised. In this study the proteome and peptidome of the cephalic secretion was studied in parental and non-parental fish using capillary electrophoresis coupled to mass spectrometry (CE-MS) and GeLC-MS/MS analyses. Multiple comparisons revealed 28 peptides were significantly different between males and parental males (PC-males), 126 between females and parental females (PC-females), 51 between males and females and 9 between PC-males and PC-females. Identification revealed peptides were produced in the inner ear (pcdh15b), eyes (tetraspanin and ppp2r3a), central nervous system (otud4, ribeye a, tjp1b and syn1) among others. A total of 422 proteins were also identified and gene ontology analysis revealed 28 secreted extracellular proteins. From these, 2 hormones (prolactin and stanniocalcin) and 12 proteins associated to immunological processes (serotransferrin, α-1-antitrypsin homolog, apolipoprotein A-I, and others) were identified. This study provides novel biochemical data on the lateral line fluid which will enable future hypotheses-driven experiments to better understand the physiological roles of the lateral line in chemical communication.

  6. Comparative proteome and peptidome analysis of the cephalic fluid secreted by Arapaima gigas (Teleostei: Osteoglossidae during and outside parental care.

    Directory of Open Access Journals (Sweden)

    Lucas S Torati

    Full Text Available Parental investment in Arapaima gigas includes nest building and guarding, followed by a care provision when a cephalic fluid is released from the parents' head to the offspring. This fluid has presumably important functions for the offspring but so far its composition has not been characterised. In this study the proteome and peptidome of the cephalic secretion was studied in parental and non-parental fish using capillary electrophoresis coupled to mass spectrometry (CE-MS and GeLC-MS/MS analyses. Multiple comparisons revealed 28 peptides were significantly different between males and parental males (PC-males, 126 between females and parental females (PC-females, 51 between males and females and 9 between PC-males and PC-females. Identification revealed peptides were produced in the inner ear (pcdh15b, eyes (tetraspanin and ppp2r3a, central nervous system (otud4, ribeye a, tjp1b and syn1 among others. A total of 422 proteins were also identified and gene ontology analysis revealed 28 secreted extracellular proteins. From these, 2 hormones (prolactin and stanniocalcin and 12 proteins associated to immunological processes (serotransferrin, α-1-antitrypsin homolog, apolipoprotein A-I, and others were identified. This study provides novel biochemical data on the lateral line fluid which will enable future hypotheses-driven experiments to better understand the physiological roles of the lateral line in chemical communication.

  7. [Growth and natural mortality of the fish Haemulon aurolineatum (Teleostei: Haemulidae) in the Southwest of Margarita Island, Venezuela].

    Science.gov (United States)

    Bravo, Edwis; Eslava, Nora; González, Leo

    2009-09-01

    We analyzed the growth and natural mortality of the cují (Haemulon aurolineatum) in the southwest of Margarita Island, from July 2005 through June 2006. A sample of 1,378 males and 1,143 females collected from Boca del Río artisanal fishing vessels was analyzed. The common relation for both sexes was expressed by the equation P=0.038*L(2.87). From the frequency data, a preliminary asymptotic length (L(infinity)) was estimated applying the routine of Powell and Wetherall, and the coefficient of growth (k) through ELEFAN I using program FISAT II (FAO-ICLARM). The modal progression analysis was used, previous decomposition of the frequency of lengths according to Bhattacharya, and it optimized the estimations of L(infinity) and k according to the procedure of Gulland and Holt. The curve of growth in length was fit to the model of von Bertalanffy, and described an exponential curve, where growth accelerated until the two years of age. The rate of natural mortality was high (M = 1.15 year(-1)), probably from high predation.

  8. Evidence of birth-and-death evolution of 5S rRNA gene in Channa species (Teleostei, Perciformes).

    Science.gov (United States)

    Barman, Anindya Sundar; Singh, Mamta; Singh, Rajeev Kumar; Lal, Kuldeep Kumar

    2016-12-01

    In higher eukaryotes, minor rDNA family codes for 5S rRNA that is arranged in tandem arrays and comprises of a highly conserved 120 bp long coding sequence with a variable non-transcribed spacer (NTS). Initially the 5S rDNA repeats are considered to be evolved by the process of concerted evolution. But some recent reports, including teleost fishes suggested that evolution of 5S rDNA repeat does not fit into the concerted evolution model and evolution of 5S rDNA family may be explained by a birth-and-death evolution model. In order to study the mode of evolution of 5S rDNA repeats in Perciformes fish species, nucleotide sequence and molecular organization of five species of genus Channa were analyzed in the present study. Molecular analyses revealed several variants of 5S rDNA repeats (four types of NTS) and networks created by a neighbor net algorithm for each type of sequences (I, II, III and IV) did not show a clear clustering in species specific manner. The stable secondary structure is predicted and upstream and downstream conserved regulatory elements were characterized. Sequence analyses also shown the presence of two putative pseudogenes in Channa marulius. Present study supported that 5S rDNA repeats in genus Channa were evolved under the process of birth-and-death.

  9. Evolutionary history of the Lake Tanganyika cichlid tribe Lamprologini (Teleostei: Perciformes) derived from mitochondrial and nuclear DNA data

    Science.gov (United States)

    Sturmbauer, Christian; Salzburger, Walter; Duftner, Nina; Schelly, Robert; Koblmüller, Stephan

    2010-01-01

    Lake Tanganyika comprises a cichlid species flock with substrate-breeding and mouthbrooding lineages. While sexual selection via mate choice on male mating color is thought to boost speciation rates in mouthbrooding cichlids, this is not the case in substrate-breeding lamprologines, which mostly form stable pairs and lack sexual dichromatism. We present a comprehensive reconstruction of the evolution of the cichlid tribe Lamprologini, based upon mtDNA sequences and multilocus nuclear DNA (AFLP) markers. Twelve mtDNA clades were identified, seven of which were corroborated by the AFLP tree. The radiation is likely to have started about 5.3 MYA, contemporarily with that of the mouthbrooding C-lineage, and probably triggered by the onset of deep-water conditions in Lake Tanganyika. Neither the Congo- nor the Malagarazi River species form the most ancestral branch. Several conflicts in the mtDNA phylogeny with taxonomic assignments based upon color, eco-morphology and behavior could be resolved and complemented by the AFLP analysis. Introgressive hybridization upon secondary contact seems to be the most likely cause for paraphyly of taxa due to mtDNA capture in species involving brood-care helpers, while accidental hybridization best explains the para- or polyphyly of several gastropod shell breeders. Taxonomic error or paraphyly due to the survival of ancestral lineages appear responsible for inconsistencies in the genera Lamprologus and Neolamprologus. PMID:20601006

  10. 5S rDNA characterization in twelve Sciaenidae fish species (Teleostei, Perciformes: depicting gene diversity and molecular markers

    Directory of Open Access Journals (Sweden)

    Fernanda A. Alves-Costa

    2008-01-01

    Full Text Available In order to extend the genetic data on the Sciaenidae fish family, the present study had the purpose to characterize PCR-generated 5S rDNA repeats of twelve species of this group through PAGE (Polyacrylamide Gel Electrophoresis analysis. The results showed the occurrence of at least two different 5S rDNA size classes in all the species. Moreover, 5S rDNA repeats of one of the studied species - Isopisthus parvipinnis - were cloned and subjected to nucleotide sequencing and Southern blot membrane hybridization analyses, which permitted to confirm the existence of two major 5S rDNA classes. Phylogenetic analysis based on the nucleotide sequences of different 5S rDNA repeats of I. parvipinnis lead to their separation into two major clusters. These results may reflect the high dynamism that rules the evolution rate of 5S rDNA repeats. The obtained data suggest that 5S rDNA can be useful in genetic analyses to identify species-specific markers and determine relationships among species of the Sciaenidae group.

  11. A new species of Neobathyclupea from the northern Indian Ocean with comments on N. malayana (Teleostei, Perciformes, Bathyclupeidae).

    Science.gov (United States)

    Prokofiev, Artem M; Gon, Ofer; Psomadakis, Peter N

    2016-12-19

    A new species of Neobathyclupea is described from two specimens collected off Myanmar and off Socotra Island. The new species is most similar to N. malayana, but differs from it and other congeners in having jet-black coloured fins, larger pseudobranch, dorsal-pterygiophore pattern and some body proportions. Neobathyclupea malayana is re-diagnosed. Individual variations in armament of the preopercle and in the dorsal-pterygiophore patterns within Bathyclupeidae are discussed.

  12. A popular and potentially sustainable fishery resource under pressure–extinction risk and conservation of Brazilian Sciaenidae (Teleostei: Perciformes

    Directory of Open Access Journals (Sweden)

    Ning Labbish Chao

    2015-07-01

    Full Text Available Croakers (Sciaenidae are major fishery resource in Brazil; constituting 22% of marine and 9% of freshwater fishery landings. Croakers are subject to heavy fishing pressure throughout Brazil, but habitat alteration is also an important threat to regional populations. In this regional Sciaenidae assessment, each species was analyzed for relative risk of extinction, including the identification and quantification of the impact of major threats and existing conservation measures, based on application of the Categories and Criteria of the IUCN Red List of Threatened Species. Of the 52 species of Sciaenid fishes (34 marine and 18 freshwater present in Brazilian waters, the majority are at low risk of extinction, with 10 species classified as Data Deficient (DD and 36 as Least Concern (LC. However the Southern black drum (Pogonias cromis, listed as Endangered (EN is the most threatened species in the region, while three other species are classified as Near Threatened (NT. A large portion of Brazilian croakers is landed by small-scale artisanal fisheries, which are scattered along coastal and riverine communities. However, our assessments reveal that available fishery landing statistics may have greatly underestimated the artisanal fishery production and by-catch of Sciaenids. We recommend establishing, with adequate enforcement, coastal and riverine protected areas as well as strategic fishing seasons to improve and maintain the conservation status of Sciaenids and sustainable Sciaenid fisheries.

  13. Crecimiento y mortalidad del pez Haemulon aurolineatum (Teleostei: Haemulidae en el suroeste de la isla de Margarita, Venezuela

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    Edwis Bravo

    2009-06-01

    Full Text Available Se determinó el crecimiento y la mortalidad natural del pez cují (Haemulon aurolineatum del suroeste de la Isla de Margarita (julio 2005 -junio 2006, para lo cual se analizó una muestra constituida por 2 541 ejemplares recolectados de la pesca artesanal de Boca del Río. La relación talla-peso entre machos y hembras no mostró diferencias significativas en las pendientes "b" (p>0.05; ts=-1.69 ni en los interceptos "a" (p>0.05; ts=-1.01, por lo que se estableció una relación común para ambos sexos: P=0.038*LT2.87. A partir de los datos de distribución de frecuencia de tallas se estimó la longitud asintótica ( aplicando la rutina de Powell-Wetherall, y el coeficiente de crecimiento (k a través de la rutina ELEFAN I (Gayanilo et al. 1996. Posteriormente se empleó el análisis de la progresión modal, previa descomposición de la frecuencia de longitudes de acuerdo al método de Bhattacharya (1967, y se optimizaron las estimaciones de y k según el procedimiento de Gulland y Holt (1959. Los parámetros de crecimiento estimados (L8=24.2 cm y k=0.48 año-1 mostraron un crecimiento moderadamente rápido. Los datos de frecuencias de longitudes fueron ajustados al modelo de von Bertalanffy (1960, indicando una tendencia de tipo exponencial: crecimiento acelerado hasta los 2 años de edad, que luego se hizo lento hasta que el pez alcanzó la longitud máxima. La tasa de mortalidad natural fue alta (M=1.15 año-1, probablemente por alta depredación.

  14. Composition and structure of the parasite faunas of cod, Gadus morhua L. (Teleostei: Gadidae, in the North East Atlantic

    Directory of Open Access Journals (Sweden)

    Kostadinova Aneta

    2008-07-01

    Full Text Available Abstract Background Although numerous studies on parasites of the Atlantic cod, Gadus morhua L. have been conducted in the North Atlantic, comparative analyses on local cod parasite faunas are virtually lacking. The present study is based on examination of large samples of cod from six geographical areas of the North East Atlantic which yielded abundant baseline data on parasite distribution and abundance. Materials and Methods A total of 826 fish was sampled in the Baltic, Celtic, Irish and North seas, Icelandic waters and Trondheimsfjord (Norway in 2002 (spring and autumn and 2003 (spring. The gills and internal organs (oesophagus, stomach, intestine, pyloric caeca, liver, heart, spleen, gall bladder and gonads were examined for macroparasites following a standardised protocol. The taxonomic consistency of the identification was ensured thorough the entire study. Results We discuss some problems in parasite identification, outline the composition of the parasite faunas in cod in the six North East Atlantic regions, provide novel data on parasite prevalence and abundance and a comparative assessment of the structure of the regional parasite faunas with respect to the higher-level taxonomic groupings, host specificity and zoogeographical distribution of the parasites. Altogether 57 different parasite forms were found including seven new host records (Diclidophora merlangi, Rhipidocotyle sp., Fellodistomum sp., Steringotrema sp., Cucullanus sp., Spinitectus sp., and Chondracanthus ornatus. The predominant groups of cod parasites were trematodes (19 species and nematodes (13 species including larval anisakids which comprised 58.2% of the total number of individuals. Conclusion Our study reveals relatively rich regional parasite faunas in cod from the North East Atlantic which are dominated by generalist parasites with Arcto-Boreal distribution. Further, it provides more detailed data on the distribution in the North East Atlantic of the majority of cod parasites which may serve as baselines for future studies on the effect of climate change. Based on the faunal comparisons, predictions can be made in relation to the structure and diversity of the parasite communities in the North East Atlantic regions studied.

  15. Ontogenic retinal changes in three ecologically distinct elopomorph fishes (Elopomorpha:Teleostei) correlate with light environment and behavior.

    Science.gov (United States)

    Taylor, Scott M; Loew, Ellis R; Grace, Michael S

    2015-01-01

    Unlike the mammalian retina, the teleost fish retina undergoes persistent neurogenesis from intrinsic stem cells. In marine teleosts, most cone photoreceptor genesis occurs early in the embryonic and larval stages, and rods are added primarily during and after metamorphosis. This study demonstrates a developmental paradigm in elopomorph fishes in which retinas are rod-dominated in larvae, but undergo periods of later cone genesis. Retinal characteristics were compared at different developmental stages among three ecologically distinct elopomorph fishes-ladyfish (Elops saurus), bonefish (Albula vulpes), and speckled worm eel (Myrophis punctatus). The objectives were to improve our understanding of (1) the developmental strategy in the elopomorph retina, (2) the functional architecture of the retina as it relates to ecology, and (3) how the light environment influences photoreceptor genesis. Photoreceptor morphologies, distributions, and spectral absorption were studied at larval, juvenile, and adult stages. Premetamorphic retinas in all three species are rod-dominated, but the retinas of these species undergo dramatic change over the course of development, resulting in juvenile and adult retinal characteristics that correlate closely with ecology. Adult E. saurus has high rod densities, grouped photoreceptors, a reflective tapetum, and longer-wavelength photopigments, supporting vision in turbid, low-light conditions. Adult A. vulpes has high cone densities, low rod densities, and shorter-wavelength photopigments, supporting diurnal vision in shallow, clear water. M. punctatus loses cones during metamorphosis, develops new cones after settlement, and maintains high rod but low cone densities, supporting primarily nocturnal vision. M. punctatus secondary cone genesis occurs rapidly throughout the retina, suggesting a novel mechanism of vertebrate photoreceptor genesis. Finally, in postsettlement M. punctatus, the continuous presence or absence of visible light modulates rod distribution but does not affect secondary cone genesis, suggesting some degree of developmental plasticity influenced by the light environment.

  16. Notes on the genus Amphiprion Bloch & Schneider, 1801 (Teleostei: Pomacentridae) and its host sea anemones in the Seychelles

    NARCIS (Netherlands)

    Hartog, den J.C.

    1997-01-01

    The genus Amphiprion Bloch & Schneider, 1801, is represented in the Seychelles by two species, A. akallopisos Bleeker, 1853, and the endemic A. fuscocaudatus Allen, 1972. Throughout its distributional range Amphiprion akallopisos has exclusively been recorded to associate with the clownfish anemones

  17. Before the freeze: otoliths from the Eocene of Seymour Island, Antarctica, reveal dominance of gadiform fishes (Teleostei).

    Science.gov (United States)

    Schwarzhans, Werner; Mörs, Thomas; Engelbrecht, Andrea; Reguero, Marcelo; Kriwet, Jürgen

    2017-01-01

    The first record of fossil teleostean otoliths from Antarctica is reported. The fossils were obtained from late Early Eocene shell beds of the La Meseta Formation, Seymour Island that represent the last temperate marine climate phase in Antarctica prior to the onset of cooling and subsequent glaciation during the late Eocene. A total of 17 otolith-based teleost taxa are recognized, with 10 being identifiable to species level containing nine new species and one new genus: Argentina antarctica sp. nov., Diaphus? marambionis sp. nov., Macruronus eastmani sp. nov., Coelorinchus balushkini sp. nov., Coelorinchus nordenskjoeldi sp. nov., Palimphemus seymourensis sp. nov., Hoplobrotula? antipoda sp. nov., Notoberyx cionei gen. et sp. nov. and Cepola anderssoni sp. nov. Macruronus eastmani sp. nov. is also known from the late Eocene of Southern Australia, and Tripterophycis immutatus Schwarzhans, widespread in the southern oceans during the Eocene, has been recorded from New Zealand, southern Australia, and now Antarctica. The otolith assemblage shows a typical composition of temperate fishes dominated by gadiforms, very similar at genus and family levels to associations known from middle Eocene strata of New Zealand and the late Eocene of southern Australia, but also to the temperate Northern Hemisphere associations from the Paleocene of Denmark. The Seymour Island fauna bridges a gap in the record of global temperate marine teleost faunas during the early Eocene climate maximum. The dominant gadiforms are interpreted as the main temperate faunal component, as in the Paleocene of Denmark. Here they are represented by the families Moridae, Merlucciidae (Macruroninae), Macrouridae and Gadidae. Nowadays Gadidae are a chiefly Northern Hemisphere temperate family. Moridae, Macruroninae and Macrouridae live today on the lower shelf to deep-water or mesopelagically with Macruroninae being restricted to the Southern Ocean. The extant endemic Antarctic gadiform family Muraenolepididae is missing, as are the dominant modern Antarctic fishes of the perciform suborder Notothenioidei. Recently, there has been much debate on isolated jaw bones of teleost fishes found in the La Meseta Formation and whether they would represent gadiforms (Merlucciidae in this case) or some early, primitive notothenioid. Otoliths are known to often complement rather than duplicate skeletal finds. With this in mind, we conclude that our otolith data support the presence of gadiforms in the early Eocene of Antarctica while it does not rule out the presence of notothenioids at the same time. http://zoobank.org/urn:lsid:zoobank.org:pub:A30E5364-0003-4467-B902-43A41AD456CC.

  18. Structure and function of the retinal pigment epithelium, photoreceptors and cornea in the eye of Sardinella aurita (Clupeidae, Teleostei

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    Mostafa Ali Salem

    2016-05-01

    Full Text Available The structure of the pigment epithelium, photoreceptors and the cornea in the eye of a teleost, Sardinella aurita was examined by light and electron microscopy. The retinal pigment epithelium forms a single layer of cells joined laterally by cell junctions. Centrally in the retina these cells are columnar, while more peripherally they become cuboidal in shape. The basal (scleral border of the pigment epithelial cells is not infolded but is relatively smooth. Phagosomes containing lysosome-like bodies are also common features of the retinal pigment epithelium. Numerous melanosomes (pigment granules are abundant throughout the epithelial cells. These melanosomes probably absorb light which has passed through the photoreceptor layer. Four photoreceptor cells were identified; rods, long single cones, short single cones and double cones. The presence of these types suggests a diversity of photoreceptor function. Square mosaic pattern of cones and well-developed choroid gland are also main features of the eye. The inner segment of rods and cones were rich in organelles indicating much synthetic activity. Calycal processes projecting from cone outer segments are also observed. The cornea includes an epithelium with a complex pattern of surface microplicae, a basement membrane, dermal stroma, an iridescent layer, scleral stroma, Descemet’s membrane and endothelium. The autochthonous layer which is seen in some teleosts has not been observed in the cornea of this species. These and other observations were discussed in relation to the photic environment and habits of this fish.

  19. DNA barcoding at riverscape scales: Assessing biodiversity among fishes of the genus Cottus (Teleostei) in northern Rocky Mountain streams

    Science.gov (United States)

    Michael K. Young; Kevin S. McKelvey; Kristine L. Pilgrim; Michael K. Schwartz

    2013-01-01

    There is growing interest in broad-scale biodiversity assessments that can serve as benchmarks for identifying ecological change. Genetic tools have been used for such assessments for decades, but spatial sampling considerations have largely been ignored. Here, we demonstrate how intensive sampling efforts across a large geographical scale can influence identification...

  20. Evolutionary patterns of shape and functional diversification in the skull and jaw musculature of triggerfishes (Teleostei: Balistidae).

    Science.gov (United States)

    McCord, Charlene L; Westneat, Mark W

    2016-06-01

    The robust skull and highly subdivided adductor mandibulae muscles of triggerfishes provide an excellent system within which to analyze the evolutionary processes underlying phenotypic diversification. We surveyed the anatomical diversity of balistid jaws using Procrustes-based geometric morphometric analyses and a phylomorphospace approach to quantifying morphological transformation through evolution. We hypothesized that metrics of interspecific cranial shape would reveal patterns of phylogenetic diversification that are congruent with functional and ecological transformation. Morphological landmarks outlining skull and adductor mandibulae muscle shape were collected from 27 triggerfish species. Procrustes-transformed skull shape configurations revealed significant phylogenetic and size-influenced structure. Phylomorphospace plots of cranial shape diversity reveal groupings of shape between different species of triggerfish that are mostly consistent with phylogenetic relatedness. Repeated instances of convergence upon similar cranial shape by genetically disparate taxa are likely due to the functional demands of shared specialized dietary habits. This study shows that the diversification of triggerfish skulls occurs via modifications of cranial silhouette and the positioning of subdivided jaw adductor muscles. Using the morphometric data collected here as input to a biomechanical model of triggerfish jaw function, we find that subdivided jaw adductors, in conjunction with a unique cranial skeleton, have direct biomechanical consequences that are not always congruent with phylomorphospace patterns in the triggerfish lineage. The integration of geometric morphometrics with biomechanical modeling in a phylogenetic context provides novel insight into the evolutionary patterns and ecological role of muscle subdivisions in triggerfishes. J. Morphol. 277:737-752, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  1. Conhecimento e conservação dos peixes marinhos e estuarinos (Chondrichthyes e Teleostei) da costa norte do Brasil

    OpenAIRE

    Marceniuk,Alexandre Pires; Caires,Rodrigo Antunes; Wosiacki,Wolmar Benjamin; Dario,Fabio Di

    2013-01-01

    The tropical western South Atlantic, which includes a substantial portion of the Brazilian Exclusive Economic Zone, is a region of endemism broadly recognized as being of prime importance for the conservation of the marine biodiversity. The north coast of Brazil, which comprises the states of Amapá, Pará and Maranhão from the mouth of the rio Oiapoque to the mouth of the rio Parnaíba, harbors the largest continuous mangrove in the world, with approximately 8,900 km2. The high discharge of fre...

  2. Sexual development and reproductive pattern of the Mutton hamlet, Alphestes afer (Teleostei: Epinephelidae: a dyandric, hermaphroditic reef fish

    Directory of Open Access Journals (Sweden)

    Simone Marques

    Full Text Available There is little knowledge on the reproduction of the genus Alphestes. The reproduction of the Mutton hamlet, Alphestes afer, sampled in Pernambuco reefs (Brazil was studied based on macroscopic analysis during reproductive period and histological analysis of gonad material from March 2008 to October 2009. This study showed that A. afer is a diandric, protogynous hermaphrodite. Sex change followed protogynous mode in two pathways: primary males formed from immature female individuals or secondary males formed from resting, ripe or spent female individuals. The numerical distribution of gonad classes by size indicated that females from 11-18 cm L T were immature while females from 16-25 cm L T and males from 12-22 cm L T were in various stages of gonadal development. Individuals identified as immature bisexual and transitional (presenting both ovarian and sperm tissue were sized from 16-24 cm L T. Size of first reproduction for females was 18 cm L T and for males was 12 cm L T. Alphestes afer showed multiple spawning, with spawning season period from August to December 2008 and from August to October 2009. The sex-ratio (females: males in 2008 and 2009 was 0.94:1 during the months of spawning season. Males were smaller than females, reaching maximum size of 22 cm compared to 25 cm observed for females. Males showed a high sperm competition rank (3.8, suggesting intense sperm competition. This latter is a possible indication of a shift in the mating group structure from paired to group spawning. The presence of small males added to high sperm competition index, suggest that this species, while retaining the protogynous pattern, has a reproductive strategy similar to gonochorist epinephelids.

  3. Australoheros mattosi Ottoni, 2012 (Teleostei: Cichlidae: live coloration, population differences, and new data on adult external anatomy

    Directory of Open Access Journals (Sweden)

    Gilmar Ferreira Carmo

    2016-02-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2016v29n1p55 Recently collected specimens of Australoheros mattosi in water courses around locality type (Das Velhas River drainage, including Upper Cipó River, Minas Gerais, Brazil revealed new data on the adult live coloration (iridescent markings on the base of the dorsal and anal fins and reddish to grayish hyaline coloration on the distal margin of the caudal-fin, population (dorsal head profile and head ground coloration and ontogenetic variations (variation in the nostril position, head ventral profile, scales on the cheek and the anal and dorsal fins, spot on the posterior margin of the operculum, and ground coloration in alcohol on the external morphology and new morphometric data (pelvic-pectoral distance, eye position in relation to the horizontal axis at the symphysis and the 5th ceratobranchial levels on adult individuals.

  4. Abundance and behavioural ecology of the blenny Ophioblennius trinitatis (Teleostei: Blenniidae) at an oceanic archipelago of Brazil (Atlantic)

    National Research Council Canada - National Science Library

    Medeiros, Paulo R; Rada, Danilo P; Rosa, Ricardo S

    2014-01-01

    .... Turf algae was the preferred food item at all sites, but given its high availability inside and outside territory boundaries, it did not seem to be a limiting factor on the density of this blenny...

  5. Diet and food consumption of the pearl cichlid Geophagus brasiliensis (Teleostei: Cichlidae: relationships with gender and sexual maturity

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    Rodrigo F. Bastos

    Full Text Available Despite the importance of the pearl cichlid Geophagus brasiliensis for the aquarium fish trade worldwide and its wide distribution, many aspects of its biology, such as the relationships between its feeding ecology and reproductive behavior, are not fully understood in natural conditions on its native habitat. In this paper, we investigated its diet focusing on how differences in diet and food consumption are related to differences in gender and sexual maturity. The digestive tract of each individual was dissected and had its content analyzed, whereas each gonad was microscopically analyzed to determine gender (male/female and sexual maturity (immature/mature. A total of 28 females and 31 males were analyzed. Mature individuals were more common than immature specimens both for males (64.50% and females (64.30%. The analysis of 52 individuals with non-empty digestive tracts revealed a diet comprised of 27 items. According to the Index of Alimentary importance (%IAi, the most important food items in the diet were Gastropoda (37.30%, fragments of vascular plants (15.16%, detritus (10.14%, Amphipoda (9.24%, and fish scales (6.29%. Mature males had more empty stomachs (65.00% when compared to immature males (27.27% and immature (55.56% and mature females (40.00%. Also, mature females seemed to have more food consumption (greater mean values of total volume in their digestive tracts than mature males. Some hypotheses are proposed in order to distinguish if this gender-based difference in food consumption in mature individuals of the pearl cichlid could be associated with the development of primary and secondary sexual characteristics or with asymmetrical time invested in parental care activities.

  6. On a record of two alien fish species (Teleostei: Osphronemidae from the natural waters of Chennai, Tamil Nadu, India

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    J.D. Marcus Knight

    2015-03-01

    Full Text Available Aquarium trade has been the source of many alien species being introduced into the natural waters of Chennai.  Trichopsis vittata and Macropodus opercularis are being reported for the first from Chennai. However,  contrary to the propagule pressure theory both these species are not common in the aquarium trade, raising speculations of inter-basin water transfer playing a role in introducing non-native species into an ecosystem.  

  7. A new record of the non-native fish species Butis koilomatodon (Bleeker 1849 (Teleostei: Eleotridae for southeastern Brazil

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    Riguel Feltrin Contente

    2016-05-01

    Full Text Available This work reports the second record of the Indo-Pacific invasive mud sleeper, Butis koilomatodon, for coastal São Paulo in southeastern Brazil, and represents the southernmost record for this species in the southwestern Atlantic Ocean. The risks of a potential invasion mediated by anthropogenic impacts on the area of occurrence are also discussed.

  8. Dynamics of Rex3 in the genomes of endangered Iberian Leuciscinae (Teleostei, Cyprinidae) and their natural hybrids

    Czech Academy of Sciences Publication Activity Database

    Pereira, C. S.; Pazian, M. F.; Ráb, Petr; Collares-Pereira, M. J.

    2015-01-01

    Roč. 8, č. 81 (2015) ISSN 1755-8166 Institutional support: RVO:67985904 Keywords : Anaecypris hispanica * Chondrostoma s.l. sp * Karyotype differentiation Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 1.506, year: 2015

  9. A macroscopic classification of the embryonic development of the one-sided livebearer Jenynsia multidentata (Teleostei: Anablepidae

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    Nathalia C. López-Rodríguez

    2017-12-01

    Full Text Available ABSTRACT This study proposes eight stages according to the main discernible changes recorded throughout the embryonic development of Jenynsia multidentata. The development of morphological embryo structures, pigmentation, and changes in tissues connecting mother and embryo were included in the stage characterization. From the fertilized egg (Stage 1, an embryo reaches the intermediary stages when presenting yolk syncytial layer (Stage 2, initial pigmentation of the outer layers of the retina and dorsal region of the head (Stage 3, and the sprouting of the caudal (Stage 4, dorsal and anal fins (Stage 5. During the later stages, the ovarian folds enter the gills, and the body pigmentation becomes more intense (Stage 6, the body becomes elongated (Stage 7, and there is a greater intensity in body pigmentation and increased muscle mass (Stage 8. The dry weight of the batches varied between 0.6 ± 0.3 mg (Stage 3 to 54.6 ± 19.7 mg (Stage 8, but the dry weight of the maternal-embryonic connecting tissues remained almost constant. After controlling the effect of those reproductive tissues, the gain in dry weight of the batches throughout development increased exponentially from Stage 6, reflecting the increase in size and weight of the embryos due to matrotrophy.

  10. Population structure and reproduction of Menticirrhus americanus (Linnaeus, 1758 (Teleostei, Sciaenidae in Ubatuba-Enseada Bay, Santa Catarina, Brazil

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    Carolina Ferreira Haluch

    2011-02-01

    Full Text Available Population structure and reproductive aspects of the southern kingfish Menticirrhus americanus in Santa Catarina northern coast were investigated. Trawl nets were used for the monthly surveys between October (2003 and September (2004. A total of 425 individuals between 4.2 and 31.8cm (mean 12.7 ± 5.7 were analyzed, and the majority of the individuals (4.2 to12.5cm was captured mainly in summer, autumn and winter, while larger individuals were captured in spring. Females of all size classes were predominant during summer and winter, and weight/length relationship showed significant differences between sexes and a positive alometric growth for the species. The size at first maturity (L50 was estimated in 16.7cm for females and 15.4cm for males. The reproductive period occurred in warm seasons, and M. americanus showed multiple spawning. The hepatossomatic index demonstrated a similar seasonal pattern as the gonadosomatic index, and was a good indicator of the spawning. The condition factor wasn’t a good indicator of the spawning period, but it was related with the recovery process and gonad maturation. Characteristics of the population dynamic showed that M. americanus utilizes the study area for reproduction and recruitment.

  11. Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae (Steindachner, 1878 in the bay of Marajo, Amazon Estuary, Brazil

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    Nayara Barbosa Santos

    Full Text Available Plagioscion magdalenae (pacora is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L50, sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female. Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed.

  12. Evolutionary history of Otophysi (Teleostei, a major clade of the modern freshwater fishes: Pangaean origin and Mesozoic radiation

    Directory of Open Access Journals (Sweden)

    Saitoh Kenji

    2011-06-01

    Full Text Available Abstract Background Freshwater harbors approximately 12,000 fish species accounting for 43% of the diversity of all modern fish. A single ancestral lineage evolved into about two-thirds of this enormous biodiversity (≈ 7900 spp. and is currently distributed throughout the world's continents except Antarctica. Despite such remarkable species diversity and ubiquity, the evolutionary history of this major freshwater fish clade, Otophysi, remains largely unexplored. To gain insight into the history of otophysan diversification, we constructed a timetree based on whole mitogenome sequences across 110 species representing 55 of the 64 families. Results Partitioned maximum likelihood analysis based on unambiguously aligned sequences (9923 bp confidently recovered the monophyly of Otophysi and the two constituent subgroups (Cypriniformes and Characiphysi. The latter clade comprised three orders (Gymnotiformes, Characiformes, Siluriformes, and Gymnotiformes was sister to the latter two groups. One of the two suborders in Characiformes (Characoidei was more closely related to Siluriformes than to its own suborder (Citharinoidei, rendering the characiforms paraphyletic. Although this novel relationship did not receive strong statistical support, it was supported by analyzing independent nuclear markers. A relaxed molecular clock Bayesian analysis of the divergence times and reconstruction of ancestral habitats on the timetree suggest a Pangaean origin and Mesozoic radiation of otophysans. Conclusions The present timetree demonstrates that survival of the ancestral lineages through the two consecutive mass extinctions on Pangaea, and subsequent radiations during the Jurassic through early Cretaceous shaped the modern familial diversity of otophysans. This evolutionary scenario is consistent with recent arguments based on biogeographic inferences and molecular divergence time estimates. No fossil otophysan, however, has been recorded before the Albian, the early Cretaceous 100-112 Ma, creating an over 100 million year time span without fossil evidence. This formidable ghost range partially reflects a genuine difference between the estimated ages of stem group origin (molecular divergence time and crown group morphological diversification (fossil divergence time; the ghost range, however, would be filled with discoveries of older fossils that can be used as more reasonable time constraints as well as with developments of more realistic models that capture the rates of molecular sequences accurately.

  13. Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States

    Science.gov (United States)

    Meister, H.S.; Wyanski, D.M.; Loefer, J.K.; Ross, Steve W.; Quattrini, A.M.; Sulak, K.J.

    2005-01-01

    We document the continued population expansion of red lionfish, Pterois volitans, the first documented successful introduction of an invasive marine fish species from the western Pacific to Atlantic coastal waters of the United States. Red lionfish are indigenous to the Indo-Pacific and have apparently established one or more breeding populations on reefs off the southeastern United States. Fifty-nine specimens, most presumably adult red lionfish, were documented or collected on live-bottom reefs off North Carolina, South Carolina, and Florida, and on a manmade structure off Georgia. Observation/collection depths and bottom water temperatures for these fish ranged from 40-99 m and 13.8-24.4??C, respectively. Eleven juvenile lionfish, believed to be expatriated from southeastern waters, were collected in estuaries along the coast of Long Island, NY, at depths of 0-5 m and water temperatures ranging from 13.8-16.5??C. Twelve of the total 70 specimens collected or observed were positively identified as red lionfish. Based on histological assessment of gonad tissue, two reproductively-active males and one immature female were collected. The life history of red lionfish, especially their reproductive biology and food habits, should be investigated along the east coast of the US to determine the potential impacts of this species on ecosystems they have invaded.

  14. The Biology and Life-history Strategies of Ilisha(Teleostei: Pristigasteridae) in the Coastal Waters and Estuaries of Sarawak

    Science.gov (United States)

    Blaber, S. J. M.; Staunton-Smith, J.; Milton, D. A.; Fry, G.; Van der Velde, T.; Pang, J.; Wong, P.; Boon-Teck, Ong

    1998-10-01

    Many genera and species of clupeoids are poorly known, especially in the subtropics and tropics where their diversity is high and they are usually among the largest component of estuarine and coastal artisanal and subsistence fisheries. One such genus, Ilisha, is caught by fisheries along the coast of Sarawak (South China Sea). Specimens over 500 mm standard length (SL) are a delicacy and command very high prices but large Ilishaare now rare and there is concern for the state of the stocks. The objectives of the present work, the first detailed study of any Indo-West Pacific Ilisha, were (1) to determine which species of Ilishaoccur in Sarawak, and which of those reach a large size and (2) to describe the biology and ecology of each species, and relate these to distribution patterns and life-history strategies. A total of six species of Ilishawere recorded from Sarawak, but only one, Ilisha filigera, reaches a large size and hence is commercially valuable. The adults of all species live in coastal waters, but only I. filigeraand Ilisha pristigastroidespenetrate to the middle reaches of estuaries (salinity down to about 9, turbidities as high as 1000 NTU). The juveniles of these two species and Ilisha elongataand Ilisha megalopterawere recorded in low salinities (1-5) in the upper reaches of estuaries. In all species there is ontogenetic diet switching, usually from zooplankton to fish or larger nekton such as penaeids. Ilisha melastomais primarily a mollusc feeder; the other five are primarily piscivorous with Crustacea of secondary importance. In most species, the males mature at a smaller size than the females, but there are otherwise no clear differences in size. Ilisha filigeraspawns only in the wet season, while the rest spawn mainly in the dry. From length-at-age data (using otoliths), Ilishacan be divided into three broad life-history groups: (1) small species growing to about 200 mm SL in length and living for less than 2 years: I. kampeniand I. melastoma; (2) medium-size species growing to about 400 mm SL and living for about 2 years: I. elongata, I. megalopteraand I. pristigastroides; and (3) I. filigera, which reaches more than 700 mm SL (making it one of the largest clupeids in the world) and lives for more than 4 years. The life-history strategies of the genus are discussed in relation to diet, reproduction and growth. While small species such as I. melastomacan probably withstand heavy fishing pressure, large species that mature later, such as I. elongataand I. pristigastroides, are more vulnerable to overfishing. The present scarcity of the large, long-lived species, I. filigera, suggests that it cannot withstand current levels of exploitation.

  15. Taxonomic review of the genus Trisopterus(Teleostei: Gadidae) with recognition of the capelan Trisopterus capelanus as a valid species.

    Science.gov (United States)

    Delling, B; Noren, M; Kullander, S O; González, J A

    2011-11-01

    Trisopterus is demonstrated to be monophyletic, including four distinct species: T. capelanus, T. esmarkii, T. luscus and T. minutus. The capelan T. capelanus is resurrected from the synonymy of poor cod T. minutus, and is shown to be morphologically more similar to T. luscus, to which species it is also more closely related, indicated by a phylogenetic analysis presented here. A lectotype is designated for T. luscus. Trisopterus fasciatus, the type species of Trisopterus, is a junior synonym of T. luscus, and the lectotype of T. luscus is designated as the neotype of T. fasciatus. The lectotype of T. luscus is also designated as the neotype of Gadus barbatus. Gadus barbatus has priority over T. luscus but the name is suppressed by prevailing usage of T. luscus. A neotype is designated also for T. minutus. A phylogenetic analysis using mitochondrial cytochrome b, and a fragment of the nuclear rhodopsin gene, shows that T. capelanus and T. luscus are sister species, and in turn sister to a clade formed by T. minutus and T. esmarkii. © 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles.

  16. Helicometrina nimia Linton, 1910 (Digenea: Opecoelidae in dusky grouper Epinephelus marginatus (Lowe, 1834 (Teleostei: Serranidae from southeastern Brazil

    Directory of Open Access Journals (Sweden)

    K. Roumbedakis

    Full Text Available Helicometrina nimia (Opecoelidae is a digenean with wide distribution. Fish families most commonly used as hosts for H. nimia are Serranidae, Pomodasydae, Scorpaenidae and Clinidae. In the present study, a new host and a new host locality are presented for the species. A description of the studied specimens, besides comments concerning its taxonomic status and biometrically compared tables of H. nimia reports are given. The taxonomic status of members of Helicometrina has been questionable. The greatest controversy for the genus seems to be related to the validity of diagnostic features, especially in regard to the number of testes. In the present study, all studied specimens presented a permanent and steady number of testes (n=9 and therefore its use as a diagnostic character is supported by the present authors. Epinephelus marginatus is considered a new host for Helicometrina nimia, and São Paulo state, southeastern Brazil, a new locality for the species.

  17. Helicometrina nimia Linton, 1910 (Digenea: Opecoelidae) in dusky grouper Epinephelus marginatus (Lowe, 1834) (Teleostei: Serranidae) from southeastern Brazil.

    Science.gov (United States)

    Roumbedakis, K; Marchiori, N C; Garcia, P; Pereira Junior, J; Castro, L A S; Martins, M L

    2014-05-01

    Helicometrina nimia (Opecoelidae) is a digenean with wide distribution. Fish families most commonly used as hosts for H. nimia are Serranidae, Pomodasydae, Scorpaenidae and Clinidae. In the present study, a new host and a new host locality are presented for the species. A description of the studied specimens, besides comments concerning its taxonomic status and biometrically compared tables of H. nimia reports are given. The taxonomic status of members of Helicometrina has been questionable. The greatest controversy for the genus seems to be related to the validity of diagnostic features, especially in regard to the number of testes. In the present study, all studied specimens presented a permanent and steady number of testes (n=9) and therefore its use as a diagnostic character is supported by the present authors. Epinephelus marginatus is considered a new host for Helicometrina nimia, and São Paulo state, southeastern Brazil, a new locality for the species.

  18. Influência das vitaminas C e E sobre a qualidade do semen criopreservado de Prochilodus brevis (Prochilodontidae, Teleostei

    Directory of Open Access Journals (Sweden)

    Priscila Silva de Almeida-Monteiro

    2017-08-01

    Full Text Available A criopreservação seminal permite a conservação em longo prazo dos gametas de diversas espécies, inclusive as ameaçadas, como a Prochilodus brevis. Contudo, a aplicação dessa biotecnologia pode causar danos às células espermáticas, reduzindo a qualidade seminal. Assim, tem-se buscado substâncias que minimizem os danos causados por esse processo, como os antioxidantes. Deste modo, este estudo objetivou avaliar a associação entre dois crioprotetores e duas vitaminas, em diferentes concentrações, sobre a qualidade do sêmen criopreservado de P. brevis. Para a criopreservação, o experimento foi realizado em duas etapas. Na primeira, o sêmen de 10 animais foi submetido a seis diferentes meios de congelação, oriundos da combinação de glicose 5%, dois crioprotetores (Dimetilsulfóxido [DMSO] ou Metilglicol e duas vitaminas (C ou E a 0,0001 mg, para a criopreservação. Na segunda etapa, amostras de sêmen de oito animais foram diluídas em Glicose 5% e DMSO (melhor crioprotetor encontrado na primeira etapa, associados a três diferentes concentrações das vitaminas C ou E (0,01; 0,001 e 0,0001 mg. Em ambas as etapas, as amostras in natura e pós-descongeladas foram submetidas às análises de cinética, morfologia e integridade de membrana espermática. O sêmen criopreservado com DMSO apresentou resultados significativamente superiores (p < 0,05 comparado ao congelado com Metilglicol, independente da vitamina utilizada. A taxa de espermatozoides morfologicamente normais foi superior (p < 0,05 nas amostras contendo vitamina, contudo a vitamina E reduziu as taxas de motilidade espermática, independente do crioprotetor utilizado. Quanto às concentrações das vitaminas, obtiveram-se maiores taxas de motilidade quando se criopreservou sêmen com 0,01 e 0,0001 mg de qualquer uma das vitaminas. Entretanto, a maior concentração teve efeito deletério sobre a morfologia espermática de P. brevis. Portanto, a glicose associada ao DMSO e à menor concentração de vitamina C proporciona boa qualidade ao sêmen pós-descongelado de P. brevis.

  19. Spawning and early development of the endemic and threatened Yellow Catfish Horabagrus brachysoma (Günther, 1864 (Teleostei: Bagridae

    Directory of Open Access Journals (Sweden)

    L. Bindu

    2014-01-01

    Full Text Available The present study documents the embryonic and post embryonic development of the endemic and threatened bagrid catfish Horabagrus brachysoma under captive conditions. Ovaprim® induced fishes spawned after a latency period of 11.61±1.53 hr with 95.57±3.101 % fertilization and 68.6±30.96 % hatching rates. The fertilized eggs were non-adhesive and spherical with an average diameter of 1.61±0.05 mm. Hatching occurred in 24.9±1.75 hr after fertilization, producing larvae with a mean size of 3.94±0.112 mm. Mouth and barbels were prominent in two day old larvae. Yolk absorption was completed and the larvae attained a size of 5.9±0.307 mm by four day post hatch. The larvae accepted exogenous particulate feed from the fifth day onwards. The characteristic black humeral ocellus appeared in one week old larvae. The larvae achieved 58-65 mm in 85 days.

  20. CEPF Western Ghats Special Series: Rediscovery of the threatened Western Ghats endemic sisorid catfish Glyptothorax poonaensis (Teleostei: Siluriformes: Sisoridae

    Directory of Open Access Journals (Sweden)

    N. Dahanukar

    2011-07-01

    Full Text Available Glyptothorax poonaensis Hora is an endemic sisorid catfish of the Western Ghats of India known only from its type locality in Mula-Mutha River, a tributary of Bhima River, at Pune. This fish has not been recorded from its type locality for more than 70 years and it was thought to be extinct. Here we report a recently discovered population of G. poonaensis from Indrayani River, a tributary of Bhima River. Based on 11 specimens, we have redescribed this species along with some comments on its taxonomy, length-weight relationship, feeding and breeding habits. We also performed molecular phylogeny of the fish by sequencing three mitochondrial genes encoding 16S ribosomal DNA, cytochrome b and cytochrome oxidase subunit I. Molecular analysis suggests that G. poonaensis is nested within a lineage of Glyptothorax species from northern and northeastern India and China. Further, our analysis reveals that southern Indian species of Glyptothorax do not form a monophyletic group. Molecular dating of divergence times indicates that G. poonaensis diverged from other northern Indian species 1.9 to 2.5 million years ago. Current knowledge suggests that the species could be found in two river basins with total extent of around 6100km2; however, the species is already suspected to be locally extinct from half of its known extent of occurrence. Furthermore, the habitat of the species may be threatened by increasing pollution, deforestation leading to siltation, halting of flow by damming, sandmining and introduced fish species. In the light of biodiversity conservation, especially in an important biodiversity hotspot like Western Ghats, such rare and endemic species needs prioritization.

  1. Pleistocene to holocene expansion of the black-belt cichlid in Central America, Vieja maculicauda (Teleostei: Cichlidae.

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    Caleb D McMahan

    Full Text Available The distributions of many Northern Hemisphere organisms have been influenced by fluctuations in sea level and climatic conditions during Pleistocene interglacial periods. These cycles are associated with range contraction and refugia for northern-distributed organisms as a response to glaciers. However, lower sea levels in the tropics and sub-tropics created available habitat for expansion of the ranges of freshwater organisms. The goal of this study was to use ecological niche modeling to test the hypothesis of north to south range expansion of Vieja maculicauda associated with Pleistocene glacial cycles. Understanding the biogeography of this widespread species may help us better understand the geology and interconnectivity of Central American freshwaters. Occurrence data for V. maculicauda was based on georeferencing of all museum records of specimens recovered from FishNet2. General patterns of phylogeographic structure were assessed with mtDNA. Present day niche models were generated and subsequently projected onto paleoclimatic maps of the region during the Last Interglacial, Last Glacial Maximum, and mid-Holocene. Phylogenetic analysis of mtDNA sequence data showed no phylogeographic structure throughout the range of this widespread species. Present day niche models were congruent with the observed distribution of V. maculicauda in Central America. Results showed a lack of suitable freshwater habitat in northern Central America and Mexico during the Last Interglacial, with greatest range expansion during the Last Glacial Maximum and mid-Holocene. Results support the hypothesis of a north to south range expansion of V. maculicauda associated with glacial cycles. The wide distribution of this species compared to other closely related cichlids indicates the latter did not respond to the degree of V. maculicauda in expansion of their distributions. Future work aimed at comparisons with other species and modeling of future climatic scenarios will be a fruitful area of investigation.

  2. A new vision of the origin and the oocyte development in the Ostariophysi applied to Gymnotus sylvius (Teleostei: Gymnotiformes

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    Gisleine Fernanda França

    Full Text Available Based on new knowledge coming from marine perciform species, the origin of oocytes and their development in the Ostariophysi, Gymnotus sylvius is described. In both Gymnotus sylvius and marine perciform fish, oogonia are found in the germinal epithelium that forms the surface of the ovarian lamellae. At the commencement of folliculogenesis, proliferation of oogonia and their entrance into meiosis gives rise to germ cell nests that extend into the stroma from the germinal epithelium. Both cell nests and the germinal epithelium are supported by the same basement membrane that separates them from the stroma. At the time of meiotic arrest, oocytes in a cell nest become separated one from the other as processes of prefollicle cells, these being derived from epithelial cells in the germinal epithelium, gradually encompass and individualize them while also synthesizing a basement membrane around themselves during folliculogenesis. The oocyte enters primary growth while still within the cell nest. At the completion of folliculogenesis, the oocyte and follicle cells, composing the follicle, are encompassed by a basement membrane. The follicle remains connected to the germinal epithelium as the both share a portion of common basement membrane. Cells originating from the stroma encompass the ovarian follicle, except where there is a shared basement membrane, to form the theca. The follicle, basement membrane and theca form the follicular complex. Oocyte development occurs inside the follicular complex. Development is divided into the stages primary and secondary growth, oocyte maturation and ovulation. Cortical alveoli appear in the ooplasm just prior to the beginning of secondary growth, the vitellogenic stage that begins with yolk deposition and proceeds until the oocyte is full-grown and the ooplasm is filled with yolk globules. Maturation is characterized by the germinal vesicle or nuclear migration, germinal vesicle breakdown or nuclear envelop fragmentation and the resumption of meiosis. At the ovulation the egg is released from the follicular complex into the ovarian lumen. When compared to marine Perciformes that lay pelagic eggs, oocyte development in Gymnotus sylvius has fewer steps within the stages of development, the two most remarkable being the absence of oil droplet formation during primary and secondary growth, (and the consequent absence of the oil droplets fusion during maturation, and the hydrolysis of yolf preceding ovulation.

  3. 50 CFR 665.621 - Definitions.

    Science.gov (United States)

    2010-10-01

    ..., seahorses Syngnathidae. flounders, soles Bothidae. Trunkfishes Ostraciidae. puffer fishes, porcupine fishes... Gobiidae. snappers (Those species not listed as CHCRT or as BMUS) Lutjanidae. trigger fishes (Those species... Apogonidae. moorish idols Zanclidae. butterfly fishes Chaetodontidae. Angelfishes Pomacanthidae. Damselfishes...

  4. Chorisochismus dentex (Pisces: Gobiesocidae)

    African Journals Online (AJOL)

    . The clingfishes of the western Indian Ocean and the Red Sea. Ichthyol. Bull. Smith Inst. Rhodes Univ. (30): 581-596. WlNTERBOTIOM, R. 1976. Notes on South African gobies possessing free upper pectoral fm rays (Pisces: Gobiidae). Spec.

  5. Spawning and development of Lesueurigobius sanzoi ofT northern ...

    African Journals Online (AJOL)

    1988-08-22

    Septiembre. 1980). Res. Exp. Cient. 10: 3--15. LLORIS, D., RUCABADO, J.A. & GOMES, J.A. 1984. Lesueurigobius sanzoi (de Buen, 1918) (Osteichthyes. Gobiidae) in the South East Atlantic (Namibia). Thalassas. 2(1): 93--97.

  6. Records of Copiatestes filiferus (Leukart, in Sars, 1885 Gibson and Bray, 1977 (Digenea and Gorgorhynchus sp. (Acanthocepahala of marine fish from peruvian coast

    Directory of Open Access Journals (Sweden)

    Manuel Tantaleán V

    2013-06-01

    Full Text Available In this paper, Copiatestes filiferus (Leukart, in Sars, 1885 Gibson and Bray, 1977 (Digenea and Gorgorhynchus sp. (Acanthocephala parasites of Hemilutjanus macrophthalmos (Teleostei, both parasites are new records from Peru and the fish is a new host.

  7. Acute effects of Cu on oxygen consumption and 96 hr-LC 50 values ...

    African Journals Online (AJOL)

    Acute effects of Cu on oxygen consumption and 96 hr-LC50 values in the freshwater fish Tilapia sparrmani (Teleostei: Cichlidae) in Mooi River hard water, South Africa. WJ van Aardt, Mynhardt Hough ...

  8. The use of liver histopathology, lipid peroxidation and ...

    African Journals Online (AJOL)

    The use of liver histopathology, lipid peroxidation and acetylcholinesterase assays as biomarkers of contaminant-induced stress in the Cape stumpnose, Rhabdosargus holubi (Teleostei: Sparidae), from selected South African estuaries.

  9. Comparative embryogenesis of Australian and South African ...

    African Journals Online (AJOL)

    Clinidae, Teleostei),from the Cape south coast of South Africa and from Australia, with comparative remarks on the development of juveniles in oviparous species. The sperm intromitted into the female duct fertilise the eggs within the follicles.

  10. Increased backcrossing has reduced the usefulness of ...

    African Journals Online (AJOL)

    Increased backcrossing has reduced the usefulness of morphological and allozyme data for identifying Oreochromis niloticus , O. mossambicus (Teleostei: Cichlidae) and their hybrids in the Pafuri reach of the Luvuvhu River in the Kruger National Park, South Africa.

  11. Asexual Reproduction Does Not Apparently Increase the Rate of Chromosomal Evolution: Karyotype Stability in Diploid and Triploid Clonal Hybrid Fish (Cobitis, Cypriniformes, Teleostei.

    Directory of Open Access Journals (Sweden)

    Zuzana Majtánová

    Full Text Available Interspecific hybridization, polyploidization and transitions from sexuality to asexuality considerably affect organismal genomes. Especially the last mentioned process has been assumed to play a significant role in the initiation of chromosomal rearrangements, causing increased rates of karyotype evolution. We used cytogenetic analysis and molecular dating of cladogenetic events to compare the rate of changes of chromosome morphology and karyotype in asexually and sexually reproducing counterparts in European spined loach fish (Cobitis. We studied metaphases of three sexually reproducing species and their diploid and polyploid hybrid clones of different age of origin. The material includes artificial F1 hybrid strains, representatives of lineage originated in Holocene epoch, and also individuals of an oldest known age to date (roughly 0.37 MYA. Thereafter we applied GISH technique as a marker to differentiate parental chromosomal sets in hybrids. Although the sexual species accumulated remarkable chromosomal rearrangements after their speciation, we observed no differences in chromosome numbers and/or morphology among karyotypes of asexual hybrids. These hybrids possess chromosome sets originating from respective parental species with no cytogenetically detectable recombinations, suggesting their integrity even in a long term. The switch to asexual reproduction thus did not provoke any significant acceleration of the rate of chromosomal evolution in Cobitis. Asexual animals described in other case studies reproduce ameiotically, while Cobitis hybrids described here produce eggs likely through modified meiosis. Therefore, our findings indicate that the effect of asexuality on the rate of chromosomal change may be context-dependent rather than universal and related to particular type of asexual reproduction.

  12. Light and electron microscopy of Myxobolus sciades n. sp. (Myxozoa), a parasite of the gills of the Brazilian fish Sciades herzbergii (Block, 1794) (Teleostei: Ariidae)

    OpenAIRE

    Carlos Azevedo; Graça Casal; Ivete Mendonça; Erisson Carvalho; Patrícia Matos; Edilson Matos

    2010-01-01

    A myxosporean parasite in the gill lamellae of the freshwater teleost fish, Sciades herzbergii (Ariidae) (Block, 1794), from the Poti River (Northeast of Brazil) was described by light and electron microscopy studies. Polysporic histozoic cyst-like plasmodia containing several life-cycle stages, including mature spores, were observed. The spores were pyriform and uninucleate, measuring 9.15 ± 0.39 μm (n = 50) long, 4.36 ± 0.23 μm (n = 25) wide and 2.61 ± 0.31 μm (n = 25) thick....

  13. Myxidium volitans sp. nov., a parasite of the gallbladder of the fish, Dactylopterus volitans (Teleostei: Triglidae) from the Brazilian Atlantic coast: morphology and pathology

    OpenAIRE

    Azevedo,Carlos; Casal,Graça; São Clemente,Sérgio Carmona; Lopes,Leila Maria Silva; Matos,Patrícia; Abdel-Baki,Abdel Azeem; Oliveira,Elsa; Matos,Edilson

    2011-01-01

    Myxidium volitans sp. nov. (Myxozoa: Myxidiidae) parasitizing the hypertrophied green-brownish gallbladder of the teleost Dactylopterus volitans, collected in the Atlantic coast near Niterói, Brazil was described based on ultrastructural studies. The spores were fusiform, sometimes slightly crescent-shaped on average 21.7 ± 0.3 µm (mean ± standard deviation) (n = 50) long and 5.6 ± 0.4 µm (n = 30) wide. The spore wall was thin and smooth, comprising two equally-sized valves joined by a hardly...

  14. Résultats préliminaires sur la variabilité morphométrique chez le genre Pseudophoxinus (Teleostei, Cyprinidae) dans les eaux douces tunisiennes

    OpenAIRE

    Dkhili-Abbes. T.; Kraiem. M.M.

    2008-01-01

    L’analyse de la variabilité bioécologique des populations de poissons du genre Pseudophoxinus a été réalisée par deux méthodes statistiques. La première univariée basée sur les tests de Fisher et de Duncan et a permis de distinguer l’espèce Pseudophoxinus punicus qui s’individualise par des valeurs très élevées de nombre de branchiospines au premier arc branchial gauche et d’écailles à la ligne latérale par rapport aux autres formant un groupe biologiquement homogène. La deuxième ...

  15. Mapping of the 18S and 5S ribosomal RNA genes in Astyanax altiparanae Garutti & Britski, 2000 (Teleostei, Characidae from the upper Paraná river basin, Brazil

    Directory of Open Access Journals (Sweden)

    Carlos Alexandre Fernandes

    2006-01-01

    Full Text Available Fluorescence in situ hybridization (FISH was undertaken in order to determinate the chromosomal distribution pattern of 18S and 5S ribosomal DNAs (rDNA in four populations of the characid fish Astyanax altiparanae from the upper Paraná river basin, Brazil. The 18S rDNA probe FISH revealed numerical and positional variations among specimens from the Keçaba stream compared to specimens of the other populations studied. In contrast to the variable 18S rDNA distribution pattern, highly stable chromosomal positioning of the 5S rDNA sites was observed in the four A. altiparanae populations. Divergence in the distribution pattern of 18S and 5S rDNA sites is also discussed.

  16. Crenicichla chicha, a new species of pike cichlid (Teleostei: Cichlidae from the rio Papagaio, upper rio Tapajós basin, Mato Grosso, Brazil

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    Henrique R. Varella

    Full Text Available Crenicichla chicha, new species, occurs in clear, fast-running waters with rocky substrates in the rio Papagaio and tributaries. It is distinguished from all other Crenicichla species by the combination of two character states: infraorbitals 3 and 4 co-ossified (vs. separated and 66-75 scales in the row immediately above to that containing the lower lateral line (E1 row scales. Crenicichla chicha shares a smooth preopercular margin, co-ossification of infraorbitals 3 and 4, and some color features with C. hemera from the adjacent rio Aripuanã drainage, rio Madeira basin. It differs from Crenicichla hemera in more E1 scales (66-75 vs. 58-65 and presence of a conspicuous black narrow stripe running from infraorbital 3 obliquely caudoventrad toward the preopercular margin vs. a rounded and faint suborbital marking present on infraorbitals 3-4. Examination of the type series and additional material from the rio Aripuanã confirms that Crenicichla guentheri Ploeg, 1991 is a junior subjective synonym of C. hemera Kullander, 1990.

  17. A new monozoic tapeworm, Lobulovarium longiovatum n. g., n. sp. (Cestoda: Caryophyllidea), from barbs Puntius spp. (Teleostei: Cyprinidae) in the Indomalayan region

    Czech Academy of Sciences Publication Activity Database

    Oros, Mikuláš; Ash, Anirban; Brabec, Jan; Kar, P. K.; Scholz, Tomáš

    2012-01-01

    Roč. 83, č. 1 (2012), s. 1-13 ISSN 0165-5752 R&D Projects: GA ČR GD206/09/H026; GA ČR GA524/08/0885; GA ČR GBP505/12/G112 Institutional research plan: CEZ:AV0Z60220518 Keywords : MIXED MODELS * SILURIFORMES * PARASITES * IDENTIFICATION * CATOSTOMIDAE * MORPHOLOGY * CESTOIDEA * REVISION * SOPHORE * PISCES Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.260, year: 2012 http://link.springer.com/article/10.1007%2Fs11230-012-9367-6

  18. Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae in the Igarapava Reservoir, Grande River, Southeast Brazil

    Directory of Open Access Journals (Sweden)

    Bruno Pereira Maia

    Full Text Available The catfish yellow-mandi, Pimelodus maculatus, is a valuable sporting and commercial fish of inland waters of Southeast Brazil including Igarapava Reservoir. It is a short-distance migrant that needs shorter stretches of free-flowing river to spawn compared to other Neotropical migrants. Igarapava Reservoir is one the 13 hydroelectric reservoirs, arranged in a cascade fashion, impounding the 1,300 km-long Grande River, SE Brazil. In this paper, we examined reproductive features and recruitment of the yellow-mandi in Igarapava Reservoir. We also evaluated the role of the Igarapava Fish Ladder (IFL built around Igarapava Dam on the sustainability of its fisheries. Female adult yellow-mandis that were gill netted (nets of 8-20 cm stretch-mesh during the reproductive season of 2002/2003, showed adequate ovarian development, indicated by the gonadosomatic index (12.9 ± 2.1, at mature stage and absolute fecundity (413,794 ± 206,259; range = 125,601-742,026, which were higher than those found in the literature. Postovulatory follicles present in ovarian tissue of 32% of the females examined showed that they possibly could have spawned in the reservoir area. Gill nets of 3-5 cm stretch-mesh aimed at capturing juvenile yellow-mandi were unproductive. These results indicated that Igarapava Reservoir and its reduced catchment area did not provide adequate conditions for recruitment of the yellow-mandi. This fish, the most abundant in the IFL, and those reaching the reservoir tended to remain there since no upstream passage mechanism is present. Thus, the IFL apparently was responsible for maintaining the Igarapava Reservoir stock of yellow-mandi.

  19. First release of hatchery juveniles of the dusky grouper Epinephelus marginatus (Lowe, 1834 (Serranidae: Teleostei at artificial reefs in the Mediterranean: results from a pilot study

    Directory of Open Access Journals (Sweden)

    Gabriele La Mesa

    2008-12-01

    Full Text Available A pilot experiment of stock enhancement based on the release of hatchery-reared juveniles of dusky grouper, Epinephelus marginatus, was carried out at two artificial reefs located 0.9 km offshore the south-western Sicilian coast (Central Mediterranean. The fish assemblages inhabiting the reefs were characterized using underwater visual census (UVC surveys. Despite some differences in fish species richness, diversity and abundance, both artificial reefs provide suitable feeding resources and shelter opportunities for the settlement of dusky grouper juveniles. A total of 95 dusky grouper juveniles, which were 3 and 4 years old, were released. No stress-related effects on fish swimming or behaviour were observed during the step by step transportation to the sea-bottom at 20 m depth. After release, several groupers showed very low reactivity; freezing and schooling were the most common behaviours. The sighting rate after one month of UVC surveys was 15.7% and 20% at the two artificial reefs. No effect of fish size at release on grouper survival was observed. Some groupers were not recorded on the pyramid of release but elsewhere in the same artificial reef, which demonstrated their ability to move around the reef. The extent of dispersal of the released juveniles largely exceeded the area encompassed by the reefs, which was shown by recaptures of tagged groupers by local fishermen up to 13 km from the release site. This result provides a first insight into the potential of stock enhancement of hatchery reared dusky grouper juveniles for marine ranching and conservation purposes.

  20. Infrapopulations of Gyliauchen volubilis Nagaty, 1956 (Trematoda: Gyliauchenidae in the rabbitfish Siganus rivulatus (Teleostei: Siganidae from the Saudi coast of the Red Sea

    Directory of Open Access Journals (Sweden)

    Al-Jahdali M.O.

    2012-08-01

    Full Text Available In hermaphroditic helminth parasites, infrapopulation size or mating group size mostly affects some processes acting within the infrapopulation. Here, 30 natural infrapopulations (12-154 individuals of the intestinal trematode Gyliauchen volubilis Nagaty, 1956 from the fish Siganus rivulatus consisting of newly excysted juveniles, immature and mature worms were found distributed in a well-defined fundamental niche (anterior 40 % of the intestine. In small infrapopulations, all stages of the parasite were alive. In larger infrapopulations, differential mortality was only and consistently observed among newly excysted juveniles, and gradually increased to include most or all juveniles in the largest infrapopulations. Among mature worms, the mean worm length seemed unaffected by the infrapopulation size. However, the ratio mean testis size-mean ovary size, a reliable indicator of resource allocation to the male function and of opportunities for crossfertilization, significantly increased with mating group size. In small infrapopulations, all stages of the parasite were scattered along the niche, and never seen in mating pairs (possibly reproduced by selffertilization. In larger infrapopulations, newly excysted juveniles and immature worms were scattered along the anterior two thirds of the niche, while mature worms were constantly found aggregated in its posterior third (narrow microhabitat, where some were arranged in mating pairs. The probability of mating reciprocally or unilaterally was dependent on body size. The mean number of uterine eggs per worm significantly decreased and their mean sizes significantly increased with mating group size. The results are statistically significant and suggest that infrapopulation self-regulation is greatly associated with its size.

  1. Formation of germinal epithelium during gonodal morphogenesis and differentiation in Cyprinus carpio (Teleostei:Cypriniformes) : a structural and ultrastructural analysis of the germ and somatic cells

    OpenAIRE

    Talita Sarah Mazzoni

    2009-01-01

    Resumo: Numa nova visão da morfogênese gonadal, sua descrição em Cyprinus carpio, mostra como a proliferação e diferenciação de células germinativas e somáticas a partir do primórdio gonadal levam à formação das diferentes estruturas ovarianas e testiculares e à constituição do epitélio germinativo que margeia as lamelas ovígeras e os túbulos testiculares. Em C. carpio, o primórdio gonadal é formado por células germinativas primordiais (CGPs) rodeadas por células somáticas. Após sucessivas di...

  2. Higher and lower-level relationships of the deep-sea fish order Alepocephaliformes (Teleostei: Otocephala) inferred from whole mitogenome sequences

    DEFF Research Database (Denmark)

    Poulsen, Jan Yde; Møller, Peter Rask; Lavoué, Sébastien

    2009-01-01

    relationships of Alepocephaliformes by adding newly determined whole mitogenome sequences from 19 alepocephaliforms in order to address 1) phylogenetic position of Alepocephaliformes within the Otocephala; and 2) intrarelationships of Alepocephaliformes. The present study includes 96 taxa of which 30...

  3. Asexual Reproduction Does Not Apparently Increase the Rate of Chromosomal Evolution: Karyotype Stability in Diploid and Triploid Clonal Hybrid Fish (Cobitis, Cypriniformes, Teleostei).

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    Majtánová, Zuzana; Choleva, Lukáš; Symonová, Radka; Ráb, Petr; Kotusz, Jan; Pekárik, Ladislav; Janko, Karel

    2016-01-01

    Interspecific hybridization, polyploidization and transitions from sexuality to asexuality considerably affect organismal genomes. Especially the last mentioned process has been assumed to play a significant role in the initiation of chromosomal rearrangements, causing increased rates of karyotype evolution. We used cytogenetic analysis and molecular dating of cladogenetic events to compare the rate of changes of chromosome morphology and karyotype in asexually and sexually reproducing counterparts in European spined loach fish (Cobitis). We studied metaphases of three sexually reproducing species and their diploid and polyploid hybrid clones of different age of origin. The material includes artificial F1 hybrid strains, representatives of lineage originated in Holocene epoch, and also individuals of an oldest known age to date (roughly 0.37 MYA). Thereafter we applied GISH technique as a marker to differentiate parental chromosomal sets in hybrids. Although the sexual species accumulated remarkable chromosomal rearrangements after their speciation, we observed no differences in chromosome numbers and/or morphology among karyotypes of asexual hybrids. These hybrids possess chromosome sets originating from respective parental species with no cytogenetically detectable recombinations, suggesting their integrity even in a long term. The switch to asexual reproduction thus did not provoke any significant acceleration of the rate of chromosomal evolution in Cobitis. Asexual animals described in other case studies reproduce ameiotically, while Cobitis hybrids described here produce eggs likely through modified meiosis. Therefore, our findings indicate that the effect of asexuality on the rate of chromosomal change may be context-dependent rather than universal and related to particular type of asexual reproduction.

  4. Life-history traits of temperate and thermophilic barracudas (Teleostei: Sphyraenidae) in the context of sea warming in the Mediterranean Sea.

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    Villegas-Hernández, H; Muñoz, M; Lloret, J

    2014-06-01

    This study indicated that the life-history traits of European barracuda Sphyraena sphyraena are apparently better suited to their environmental conditions compared to the more physically restricted life-history traits of the yellow-mouth barracuda Sphyraena viridensis, which co-habit the north-western Mediterranean Sea. The latter thermophilic species has a considerably higher reproductive potential as it invests its energy reserves in larger numbers of hydrated eggs per spawning batch. This would favour its population growth rates within the study area, especially if sea warming continues, in which case it is likely that the spawning phenology of this species would give it an advantage. © 2014 The Fisheries Society of the British Isles.

  5. Infestation pattern and parasitic castration of the crustacean Riggia paranensis (Crustacea: Cymothoidea on the fresh water fish Cyphocharax gilbert (Teleostei: Curimatidae

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    Juliana de Souza Azevedo

    Full Text Available Cyphocharax gilbert infested by Riggia paranensis shows parasitic castration. The prevalence of parasitism in C. gilbert varied among different environments, being higher in the middle rio Itabapoana. Fish were collected monthly using two cast nets (thrown 30 times during the day and gillnets kept in the river during 12 hour, from sunset to sunrise, between September 1997 and August 2000. Infestation pattern was investigated on 1358 specimens. Most of them were infested (57.9%, with one or two parasites; the majority (62.9% was collected during the rainy season (spring-summer. The parasite did not show preference for sex or size of hosts. A total of 91.5% of the 511 examined parasites had a body size that represented 10.1% to 20% of host standard length. The reproductive condition of 311 specimens of R. paranensis was analyzed checking the presence of oocytes in the ovarian and eggs or embryos in the marsupium. Nearly 73% of them were at reproductive phase, and had a body size that represented 5.1% to 20% of host standard length. The size of the immature parasites varied from 0.1% to 5% of the host size. The results suggest that R. paranensis may adopt a fast growth rate strategy and increase the investment in reproduction when they occupy most of the host's pericardial space.

  6. Les représentations de poissons plats [Teleostei : Pleuronectiformes] dans l'art paléolithique européen

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    Bruno Chanet

    2005-01-01

    Full Text Available Un ichtyologiste spécialiste des poissons plats et un préhistorien de l’art se livrent parallèlement à l’analyse morphologique et à la détermination spécifique de la dizaine de représentations crédibles de pleuronectiformes que compte l’art paléolithique européen. En situant ce petit corpus thématique par rapport à son cadre iconographique, chronoculturel et paléoenvironnemental, les résultats de cette démarche interdisciplinaire permettent d’objectiver l’interprétation de faits graphiques en grande partie coupés de leur contexte culturel.

  7. A review of the Pseudobarbus afer (Peters, 1864) species complex (Teleostei, Cyprinidae) in the eastern Cape Fold Ecoregion of South Africa.

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    Chakona, Albert; Skelton, Paul H

    2017-01-01

    The Eastern Cape redfin, Pseudobarbus afer, has long been considered to be a single widespread and variable species occurring in multiple isolated river systems in the Cape Fold Ecoregion (CFE) at the southern tip of Africa. Mitochondrial cytochrome b and control region sequence data of individuals from populations currently assigned to Pseudobarbus afer across the species' distribution range revealed existence of four deeply divergent taxonomic units: (i) the Mandela lineage confined to the Sundays, Swartkops and Baakens river systems, (ii) the Krom lineage endemic to the Krom River system, (iii) the St Francis lineage occurring in the Gamtoos and adjacent river systems, and (iv) the Forest lineage occurring in several coastal river systems from the Tsitsikamma to the Klein Brak River system. The Forest lineage is closely related to Pseudobarbus phlegethon from the Olifants River system on the west coast of South Africa, suggesting that it does not belong to Pseudobarbus afer s.l. Herein we focus on the three lineages within the Pseudobarbus afer s.l. complex and provide new diagnosis for Pseudobarbus afer s.s (Mandela lineage), revalidate Pseudobarbus senticeps (Krom lineage) as a distinct species, and describe a new species Pseudobarbus swartzi (St Francis lineage). The three species exhibit subtle differences, which explains why they were previously considered to represent a single variable and widespread species. Pseudobarbus senticeps differs from both Pseudobarbus afer and Pseudobarbus swartzi by having fewer (i.e. larger) scales (25-33, mode 29 lateral line scale series; 10-12, mode 11 circumpeduncular scales) and presence of a lateral stripe which terminates in a conspicuous triangular blotch at the base of the caudal fin. Long barbels which reach or surpass the vertical through the posterior edge of the eye further separate Pseudobarbus senticeps from Pseudobarbus afer s.s. which possesses simple short barbels which do not reach the vertical through the posterior margin of the eye. Pseudobarbus afer s.s differs from Pseudobarbus swartzisp. n. by possession of fewer scale rows along the lateral line (29-35, mode 32 vs 34-37, mode 36 in Pseudobarbus swartzi), fewer scales around the caudal peduncle (12-16, mode 12 vs 13-17, mode 16 in Pseudobarbus swartzi) and a distinct mesh or net-like pigmentation pattern on latero-ventral scales.

  8. Localization of 18S ribosomal genes in suckermouth armoured catfishes Loricariidae (Teleostei, Siluriformes with discussion on the Ag-NOR evolution

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    Anderson Alves

    2012-09-01

    Full Text Available The family Loricariidae with about 690 species divided into six subfamilies, is one of the world’s largest fish families. Cytogenetic studies conducted in the family showed that among 90 species analyzed the diploid number ranges from 2n=38 in Ancistrus sp. to 2n=96 in Hemipsilichthys gobio Luetken, 1874. In the present study, fluorescence in situ hybridization (FISH was employed to determine the chromosomal localization of the 18S rDNA gene in four suckermouth armoured catfishes: Kronichthys lacerta (Nichols, 1919, Pareiorhaphis splendens (Bizerril, 1995, Liposarcus multiradiatus (Hancock, 1828 and Hypostomus prope plecostomus (Linnaeus, 1758. All species analyzed showed one chromosome pair with 18S rDNA sequences, as observed in the previous Ag-NORs analyses. The presence of size and numerical polymorphism was observed and discussed, with proposing a hypothesis of the Ag-NOR evolution in Loricariidae.

  9. Predator-prey interactions between Synbranchus marmoratus (Teleostei: Synbranchidae) and Hypsiboas pulchellus tadpoles (Amphibia: Hylidae): importance of lateral line in nocturnal predation and effects of fenitrothion exposure.

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    Junges, Celina M; Lajmanovich, Rafael C; Peltzer, Paola M; Attademo, Andres M; Bassó, Agustín

    2010-11-01

    Environmental contaminants can disrupt interactions between aquatic species by altering community structure. We explored predator-prey interactions between marbled swamp juvenile eels (Synbranchus marmoratus; predator) and anuran tadpoles (Hypsiboas pulchellus; prey) in relation to two aspects: the importance of lateral line in the predator and whether the absence of light modifies predation rates; and the effect of a sub-lethal concentration of fenitrothion on both predator and prey. Eels were tested under two sensory conditions (lateral line intact and lateral line blocked by cobalt chloride) in dark conditions. Predation rates were evaluated using different treatments that combined predator and prey exposed or not to insecticide. Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) activities were also measured in muscle samples of eels and tadpoles to explore whether fenitrothion affects predator and prey differentially. Marbled swamp eels were more efficient in feeding on tadpoles during the night than during the day, showing that lateral line makes an important contribution to prey detection and capture. Regarding pesticide effects, short-term (6 h) exposure to an ecologically relevant fenitrothion dose of 2.5 mg L(-1) altered the predator-prey relationship by changing prey behaviour, reducing prey detection and therefore increasing tadpole survival. At this concentration, the outcome of the predator-prey relationship appears biased in favor of the exposed tadpoles, which were released from predation risk, despite their altered behaviour and the higher inhibition percentages of tail BChE (70%) and AChE (51%) than in control individuals. Our study involving these model species and agrochemicals demonstrates that fenitrothion affected the outcome of a predator-prey relationship. Further studies are needed, in these species and other native amphibians, to investigate the nature of the mechanisms responsible for the adverse effects of pesticides on antipredator behaviour and predation efficiency. Copyright © 2010 Elsevier Ltd. All rights reserved.

  10. A new monozoic tapeworm, Lobulovarium longiovatum n. g., n. sp. (Cestoda: Caryophyllidea), from barbs Puntius spp. (Teleostei: Cyprinidae) in the Indomalayan region.

    Science.gov (United States)

    Oros, Mikuláš; Ash, Anirban; Brabec, Jan; Kar, Pradip Kumar; Scholz, Tomáš

    2012-09-01

    A new caryophyllidean cestode is described from barbs Puntius spp. (Cypriniformes: Cyprinidae), with P. sophore (Hamilton) as its type-host, in the Ganges and Brahmaputra river basins in India and Bangladesh, and a new genus, Lobulovarium n. g., is proposed to accommodate it. The genus belongs to the Lytocestidae because its vitelline follicles are situated in the cortex. It is typified by: (i) a peculiar ovary, which is roughly H-shaped, but with asymmetrical, irregular lobes on its ventral and dorsal sides; (ii) an extensive vitellarium formed by numerous vitelline follicles scattered throughout the cortex; (iii) a long, conical postovarian part of the body with numerous vitelline follicles; (iv) a broadly digitate scolex with a slightly protrusible central cone; (v) a single gonopore (male and female genital ducts open via a single pore and a common genital atrium is absent); and (vi) a small number of testes (90 μm in L. longiovatum), which are spherical (length/width ratio 1:1 versus 2.5-3:1 in the new species), and the presence of vitelline follicles alongside the ovarian lobes (almost completely absent in L. longiovatum).

  11. Gyrodactylus malalai sp. nov. (Monogenea, Gyrodactylidae) from Nile tilapia, Oreochromis niloticus (L.) and Redbelly tilapia, Tilapia zillii (Gervais) (Teleostei, Cichlidae) in the Lake Turkana, Kenya.

    Science.gov (United States)

    Přikrylová, Iva; Radim, Blažek; Gelnar, Milan

    2012-06-01

    Gyrodactylus malalai sp. nov. is described from the fin surface of cichlid fishes Oreochromis niloticus (L.) and Tilapia zillii (Gervais) caught in Lake Turkana (Kenya). The new species morphologically resembles Gyrodactylus nyanzae Paperna, 1973, but can be readily distinguished by the shape of the marginal hook sickles and the size of its hamuli. The sequence data of rDNA spanning partial 18S, internal transcribe spacer 1 and 2 and the 5.8S gene is unique within GenBank. Genetically, as most similar Gyrodactylus ergensi Přikrylová, Matějusová, Musilová et Gelnar, 2009 was found (97.5%). Moreover, a specimen of G. cichlidarum from O. niloticus, and a specimen G. ergensi from Sarotherodon galilaeus (L.) were collected during sampling in Kenya. Likewise, additional sampling of O. niloticus from the Blue Nile in Sudan revealed the presence of the newly described species. These findings represent the first records of gyrodactylids in both African countries.

  12. The Afro-Asian labeonine genus Garra Hamilton, 1822 (Teleostei, Cyprinidae) in the Pliocene of Central Armenia: Palaeoecological and palaeobiogeographical implications

    Science.gov (United States)

    Vasilyan, Davit; Carnevale, Giorgio

    2013-01-01

    Fossil skeletal remains of the Afro-Asian labeonine genus Garra are described on the basis of more than 300 specimens from the Pliocene diatomites of Jradzor, Central Armenia. Extant species of the genus Garra exhibit a wide distribution ranging from China, South Asia, and Borneo, through Middle East, the Arabian Peninsula, and Africa, where these fishes inhabit a variety of freshwater biotopes. The Pliocene fossils from the Jradzor site provide the first evidence of Garra in the fossil record. The inadequate preservation of the available material did not allow a detailed taxonomic attribution at the species level. Remains of Garra sp. were found associated to a moderately diverse assemblage, which includes also remains of additional freshwater fishes (Capoeta sp., Leuciscus cf. souffia, Leuciscus sp.), amphibians (Pelophylax cf. ridibundus), and large mammals (Rhinocerotidae indet.), as well as of monocotyledon plants. According to the diatom flora, the diatomites of Jradzor can be assigned to the Pliocene and were deposited in a freshwater lacustrine setting that was characterized by high productivity, eutrophic conditions, and standing macrophyte vegetation along the littoral zone. The presence of abundant resorptive pharyngeal teeth suggests that the Pliocene palaeolake of Jradzor was characterized by resident populations of Garra. Extant species of this genus are currently absent in the freshwaters of Armenia. The record of the genus Garra from Jradzor suggests that the Araks-Kura River drainage was connected, at least in part, with the Euphrates and Tigris River drainage during the Pliocene. The extinction of Garra (and other thermophilous taxa) from Araks and Kura River drainage was probably due to Plio-Pleistocene tectonic uplift of the Armenian Highland and consequent progressive climate cooling.

  13. A new species of freshwater eel-tailed catfish of the genus Tandanus (Teleostei: Plotosidae) from coastal rivers of mid-northern New South Wales, Australia

    Science.gov (United States)

    Welsh, Stuart A.; Jerry, Dean R.; Burrows, Damien; Rourke, Meaghan L.

    2017-01-01

    Tandanus bellingerensis, new species, is described based on specimens from four river drainages (Bellinger, Macleay, Hastings, and Manning rivers) of the mid-northern coast of New South Wales, Australia. Previously, three species were recognized in the genus Tandanus: T. tropicanus of the wet tropics region of northeast Queensland, T. tandanus of the Murray-Darling drainage and coastal streams of central-southern Queensland and New South Wales, and T. bostocki of southwestern Western Australia. The new species is distinguished from all congeners by a combination of the following morphologic characters: a high count of rays in the continuous caudodorsal and anal fins (range 153–169, mode 159), a high count of gill rakers on the first arch (range 35–39, mode 36), and strongly recurved posterior serrae of the pectoral-fin spine. Additionally, results from previously conducted genetic studies corroborate morphologic and taxonomic distinctness of the new species.

  14. Structures and immunolocalization of Na+, K+ -ATPase, Na+ /H+ exchanger 3 and vacuolar-type H+ -ATPase in the gills of blennies (Teleostei: Blenniidae) inhabiting rocky intertidal areas.

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    Uchiyama, M; Komiyama, M; Yoshizawa, H; Shimizu, N; Konno, N; Matsuda, K

    2012-05-01

    The structure and immunolocalization of the ion transporters Na(+) ,K(+) -ATPase (NKA), Na(+) /H(+) exchanger (NHE3) and vacuolar-type H(+) -ATPase (VHA) were examined in the gills of teleosts of the family Blenniidae, which inhabit rocky shores with vertical zonation in subtropical seas. These features were compared among the following species with different ecologies: the amphibious rockskipper blenny Andamia tetradactylus, the intertidal white-finned blenny Praealticus tanegasimae and the purely marine yaeyama blenny Ecsenius yaeyamaensis. Light and electron microscopic observations indicated that thick gill filaments were arranged close to each other and alternately on two hemibranches of a gill arch in the opercular space of A. tetradactylus. Many mucous cells (MC) and mitochondrion-rich cells (MRC) were present in the interlamellar regions of the gill filament. An immunohistochemical study demonstrated that numerous NKA, NHE3 and some VHA were located predominantly on presumed MRCs of gill filaments and at the base of the lamellae. Analyses using serial (mirror image) sections of the gills indicated that only a few NKA immunoreactive cells (IRC) were colocalized with VHA on some MRCs in the filaments. In the gills of P. tanegasimae, NKA- and NHE3-IRCs were observed in the interlamellar region of the filaments and at the base of the lamellae. VHA-IRCs were located sparsely on the lamellae and filaments. In the gills of E. yaeyamaensis, the lamellae and filaments were thin and straight, respectively. MCs were located at the tip as well as found scattered in the interlamellar region of gill filaments. NKA-, NHE3- and VHA-IRCs were moderately frequently observed in the filaments and rarely on the lamellae. This study shows that the structure and distribution of ion transporters in the gills differ among the three blennid species, presumably reflecting their different ecologies. © 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.

  15. Otocinclus cocama, a new uniquely colored loricariid catfish from Peru (Teleostei: Siluriformes, with comments on the impact of taxonomic revisions to the discovery of new taxa

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    Roberto E. Reis

    Full Text Available A new, uniquely colored species of the loricariid catfish genus Otocinclus, O. cocama is described from a tributary to the lower río Ucayali in northern Peru. The new species is distinguished from other Otocinclus species by two putatively autapomorphic features, the distinct color pattern, consisting of vertically elongated blotches spanning from the dorsal midline to the ventral border of flanks, and by a complete lateral line. The phylogenetic relationships of the new species are investigated and it is apparently more closely related to a clade formed by O. huaorani, O. bororo, O. mariae, and O. mura. Comments on the impact of taxonomic revisions for the discovery and description of previously undetected biodiversity are also presented.

  16. Molecular systematics and historical biogeography of the Nocomis biguttatus species group (Teleostei: Cyprinidae): nuclear and mitochondrial introgression and a cryptic Ozark species.

    Science.gov (United States)

    Echelle, Anthony A; Schwemm, Michael R; Lang, Nicholas J; Nagle, Brett C; Simons, Andrew M; Unmack, Peter J; Fisher, William L; Hoagstrom, Christopher W

    2014-12-01

    The Nocomis biguttatus species group ranges widely across North America from the Red River in Oklahoma and Arkansas north to Minnesota and east-west from Wyoming to Ontario. The group includes three traditionally recognized allopatric species: the wide-ranging N. biguttatus and two geographically more restricted species, N. asper from the western Ozarks (Arkansas River system) and two disjunct locations in the Red River system, and N. effusus from the Green, Cumberland, and lower Tennessee rivers. Separate analyses of the mitochondrial cytb gene and two nuclear genes (S7 intron 1 and a portion of the gene for growth hormone, GH), each resolved a cryptic species previously treated as N. biguttatus from the southern Ozarks (White River). Relationships among the four species were unresolved because of conflicts between cytb and S7 and a lack of resolution for GH. A previously indicated N. biguttatus-N. effusus sister-relationship appears to reflect past hybridization and mtDNA capture by N. effusus. Nocomis biguttatus includes four primary cytb clades with unresolved inter-relationships. A Northern Ozarks-Great Plains-Upper Midwest Clade and an Ohio River-Eastern Great Lakes Clade presumably represent late Quaternary dispersal from glacial refugia in, respectively, the northern Ozarks and an unglaciated portion of the Ohio River system. Other clades include one from the Meramec River and a Black River-St. Francis River Clade. There was evidence in N. effusus for a phylogeographic break between the lower Tennessee River and the Green-Cumberland basins. Geographic structure is weak in N. asper, indicating relatively recent contact between now disjunct populations in the Arkansas and Red river basins. The Blue River population of N. asper appears to reflect late Pleistocene or Holocene hybridization and genetic swamping of a resident native population of N. biguttatus by an invading population of N. asper. This postulates past occurrence of N. biguttatus far south of its present range. Copyright © 2014 Elsevier Inc. All rights reserved.

  17. Omanicotyle heterospina n. gen. et n. comb. (Monogenea: Microcotylidae) from the gills of Argyrops spinifer (Forsskål) (Teleostei: Sparidae) from the Sea of Oman.

    Science.gov (United States)

    Yoon, Gil Ha; Al-Jufaili, Sarah; Freeman, Mark A; Bron, James E; Paladini, Giuseppe; Shinn, Andrew P

    2013-06-07

    The Sultanate of Oman's aquaculture industry is expanding with an on-going assessment of potential new fish species for culture. The king soldier bream, Argyrops spinifer (Forsskål) (Sparidae), is one such species that is under consideration. During a routine health assessment of specimens caught in the Sea of Oman throughout the period November 2009 to March 2011, a number of gill polyopisthocotylean monogeneans were recovered. A subsequent study of the monogeneans using a range of morphology-based approaches indicated that these were Bivagina heterospina Mamaev et Parukhin, 1974. In the absence of pre-existing molecular data, an expanded description of this species is provided, including a differential diagnosis with other species and genera belonging to the subfamily Microcotylinae Monticelli, 1892 with the subsequent movement of this species to a new genus to accommodate it. The polyopisthocotyleans collected from the gills of A. spinifer appear to be unique within the family Microcotylidae Taschenberg, 1879 in that, morphologically, they possess a pair of large, muscular vaginae each armed with a full crown of 16-18 robust spines and a unique dorsal region of folded tegument, which permits their discrimination from species of Bivagina Yamaguti, 1963. Sequencing of the SSU rDNA (complete 1968 bp) and LSU rDNA (partial 949 bp) places the specimens collected during this study within the subfamily Microcotylinae, but the LSU rDNA sequence differs from Bivagina and also from other microcotylid genera. Morphological features of B. heterospina sensu Mamaev et Parukhin, 1974 and the specimens collected from the current study are consistent with one another and represent a single species. The vaginal armature of these worms is unique and differs from all other genera within the Microcotylinae, including Bivagina, and its movement to Omanicotyle n. gen. to accommodate this species is proposed. A new genus, Omanicotyle n. gen., is erected to accommodate Omanicotyle [Bivagina] heterospina n. comb. which represents the first monogenean to be described from Omani marine waters. Given the pathogenic potential of microcotylids on captive held fish stocks, a full assessment of Omanicotyle heterospina n. gen. et n. comb. is now required before large-scale production commences.

  18. Monogenea of marine fishes from Hainan Island, China. VIII. Two new species of Euryhaliotrema Kritsky & Boeger, 2002 (Dactylogyridae) from Lutjanus argentimaculatus (Teleostei: Lutjanidae).

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    Jun, Pan; Jianying, Zhang

    2006-06-01

    This paper reports two new species of Euryhaliotrema Kritsky & Boeger, 2002 collected from the gills of Lutjanus argentimaculatus (Forsskål). E. xinyingense n. sp. is similar to Euryhaliotrema atlanticum Kritsky & Boeger, 2002 in the structure of copulatory apparatus, but differs from the latter in the shape of anchors and the structure of vagina. E. hainanense n. sp. also closely resembles E. atlanticum Kritsky & Boeger, 2002, but differs from the latter in the structure of haptor and the shape of accessory piece.

  19. Infrapopulations of Gyliauchen volubilis Nagaty, 1956 (Trematoda: Gyliauchenidae) in the rabbitfish Siganus rivulatus (Teleostei: Siganidae) from the Saudi coast of the Red Sea

    Science.gov (United States)

    Al-Jahdali, M.O.

    2012-01-01

    In hermaphroditic helminth parasites, infrapopulation size or mating group size mostly affects some processes acting within the infrapopulation. Here, 30 natural infrapopulations (12-154 individuals) of the intestinal trematode Gyliauchen volubilis Nagaty, 1956 from the fish Siganus rivulatus consisting of newly excysted juveniles, immature and mature worms were found distributed in a well-defined fundamental niche (anterior 40 % of the intestine). In small infrapopulations, all stages of the parasite were alive. In larger infrapopulations, differential mortality was only and consistently observed among newly excysted juveniles, and gradually increased to include most or all juveniles in the largest infrapopulations. Among mature worms, the mean worm length seemed unaffected by the infrapopulation size. However, the ratio mean testis size-mean ovary size, a reliable indicator of resource allocation to the male function and of opportunities for crossfertilization, significantly increased with mating group size. In small infrapopulations, all stages of the parasite were scattered along the niche, and never seen in mating pairs (possibly reproduced by selffertilization). In larger infrapopulations, newly excysted juveniles and immature worms were scattered along the anterior two thirds of the niche, while mature worms were constantly found aggregated in its posterior third (narrow microhabitat), where some were arranged in mating pairs. The probability of mating reciprocally or unilaterally was dependent on body size. The mean number of uterine eggs per worm significantly decreased and their mean sizes significantly increased with mating group size. The results are statistically significant and suggest that infrapopulation self-regulation is greatly associated with its size. PMID:22910665

  20. Biodiversity of the Betta smaragdina (Teleostei: Perciformes) in the northeast region of Thailand as determined by mitochondrial COI and nuclear ITS1 gene sequences.

    Science.gov (United States)

    Kowasupat, Chanon; Panijpan, Bhinyo; Laosinchai, Parames; Ruenwongsa, Pintip; Phongdara, Amornrat; Wanna, Warapond; Senapin, Saengchan; Phiwsaiya, Kornsunee

    2014-12-01

    In Thailand, there are currently five recognized species members of the bubble-nesting Betta genus, namely Betta splendens, B. smaragdina, B. imbellis, B. mahachaiensis and B. siamorientalis. In 2010, we indicated the possibility, based on COI barcoding evidence, that there might be two additional species, albeit cryptic, related to the type-locality B. smaragdina in some provinces in the northeast of Thailand. In the present study, after a more extensive survey of the northeast, and phylogenetic analyses based on COI and ITS1 sequences, the B. smaragdina group may be composed of at least 3 cryptic species members. The phylogenetic positions of these B. smaragdina group members in the bubble-nesting bettas' tree together with those of their congeners have been consolidated by better DNA sequence quality and phylogenetic analyses. With a better supported tree, the species statuses of B. siamorientalis and the Cambodian B. smaragdina-like fish, B. stiktos, are also confirmed.

  1. Southeast Asian mouth-brooding Betta fighting fish (Teleostei: Perciformes) species and their phylogenetic relationships based on mitochondrial COI and nuclear ITS1 DNA sequences and analyses

    Science.gov (United States)

    Panijpan, Bhinyo; Kowasupat, Chanon; Laosinchai, Parames; Ruenwongsa, Pintip; Phongdara, Amornrat; Senapin, Saengchan; Wanna, Warapond; Phiwsaiya, Kornsunee; Kühne, Jens; Fasquel, Frédéric

    2014-01-01

    Fighting fish species in the genus Betta are found in several Southeast Asian countries. Depending on the mode of paternal care for fertilized eggs and hatchlings, various species of the betta fish are classified as mouth brooders or nest builders whose members in turn have been grouped according to their similarities mainly in morphology. The mouth brooders as well as some nest builders involved in the present study include fishes discovered and identified subsequent to previous reports on species groupings and their positions on phylogenetic trees based on DNA sequences that differ from those used by us in this study. From the mitochondrial COI gene and nuclear ITS1 gene sequences and more accurate analyses we conclude that the following members of the mouth-brooding pairs, named differently previously, are virtually identical, viz the Betta prima–Betta pallida pair and Betta ferox–Betta apollon pair. The Betta simplex, hitherto believed to be one species, could possibly be genetically split into 2 distinct species. In addition, several other established type-locality fishes could harbor cryptic species as judged by genetic differences. Assignments of fish species to groups reported earlier may have to be altered somewhat by the present genetic findings. We propose here a new Betta fish phylogenetic tree which, albeit being similar to the previous ones, is clearly different from them. Our gene-based evidence also leads to assignments of some fishes to new species groups and alters the positions of some species on the new phylogenetic tree, thus implying different ancestral relationships. PMID:25606468

  2. Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier (Teleostei, Characiformes, Characidae from Rio Sapucaí, Minas Gerais State, Brazil

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    José Antônio Dias Garcia

    2001-12-01

    Full Text Available Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stained cytoplasm with eosinophilic granules. The primary oocytes showed a large basophilic nucleus, with a developed peripheral nucleolus and a reduced cytoplasm. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent vitellogenesis with the development of the zona radiata and the follicle cells. Their cytochemical reactions indicated that the two layers of the zona radiata of A. fasciatus contained proteins and polysaccharides. The initially squamous follicle cells, became cuboidal. In mature oocytes, the nucleus moved toward the periphery, next to the micropyle, and the yolk granules formed by proteins, fulfilled the cytoplasm. The clear unstained vesicles are likely to be the cortical alveoli in the perivitelline region.

  3. Characterizing a novel predator–prey relationship between native Diplonychus esakii (Heteroptera: Belostomatidae and invasive Gambusia affinis (Teleostei: Poeciliidae in central China

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    Xu Ouyang

    2017-04-01

    Full Text Available Abstract A considerable body of the literature considers the potential impact of exotic predators on native prey organisms, while comparatively, few studies have asked whether and how native predators include novel prey types into their diet spectrum. Here, we asked whether the native aquatic heteropteran Diplonychus esakii preys on the highly invasive western mosquitofish (Gambusia affinis, which has been introduced to southern China and threatens native fish species through competition and predation on their fry. We conducted 48-h prey choice experiments under semi-natural conditions. In a ‘no-choice’ experiment (one predator and one potential prey; n = 200, we found the heteropterans to prey more on large-bodied fish, a pattern that was also described for other belostomatids, while prey sex had no effect on capture rates. Moreover, large-bodied heteropterans caught more fish than small-bodied individuals. However, overall capture rates in our study were low (11.5–30% compared to studies on other belostomatids, which explains why subsequent binary prey choice experiments using one predator and two prey—either large and small females or male and female (with smaller sample sizes of n = 20 and 30, respectively—did not confirm the results of our first experiment. Our study exemplifies how a pattern of body size-dependent predation can arise in a novel (not coevolved predator–prey interaction. We tentatively argue that the observed pattern could be driven by intrinsic features of the predator, namely, altered prey preferences with increasing age coupled with a general preference for large-bodied prey, or changing nutritional needs at different developmental stages.

  4. Influence of spawning procedure on gametes fertilization success in Salminus hilarii Valenciennes, 1850 (Teleostei: Characidae: Implications for the conservation of this species

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    Renato M. Honji

    Full Text Available Artificial reproduction and gamete fertilization were evaluated in Salminus hilarii wild and domesticated broodstocks. Wild and domesticated broodstocks were artificially induced to reproduction using a carp pituitary treatment. Four groups were considered: Group 1 (G1, fish caught in the wild maintained for three years in the same conditions as the domesticated broodstocks and spawned naturally; Group 2 (G2, broodstock born and raised in captivity and spawned naturally; Group 3 (G3, wild broodstocks, which were manually stripped for gamete collection and dry fertilization; and Group 4 (G4, domesticated males and females, also manually stripped. Oocytes, eggs, and larvae were sampled at different time intervals throughout embryonic development. Yolk sac absorption occurred approximately 24-29 h after hatching. Twenty-six h after hatching, the larvae mouths opened. Cannibalism was identified just 28-30 h after hatching. There was no morphological difference in embryonic development among all groups. The number of released eggs per gram of female was: G1: 83.3 ± 24.5 and G2: 103.8 ± 37.4; however, the fertilization success was lower in G2 (42.0 ± 6.37 % compared with G1 (54.7 ± 3.02% (P = 0.011. Hand-stripping of oocytes was not successful and the fertilization rate was zero. The reproduction of this species in captivity is viable, but it is necessary to improve broodstock management to enhance fertilization rates and obtain better fingerling production for restocking programs.

  5. Two new species of Hyphessobrycon (Teleostei: Characidae from upper rio Tapajós basin on Chapada dos Parecis, central Brazil

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    Tiago Pinto Carvalho

    Full Text Available Two new species of Hyphessobrycon are described from the upper rio Tapajós basin, Mato Grosso, Brazil. Hyphessobrycon melanostichos is distinguished from its congeners by the combination of a conspicuous longitudinal broad black band beginning on the posterior margin of orbit and reaching the tip of middle caudal fin rays, a distinct vertically elongate humeral spot, and 16 to 18 branched anal-fin rays. Hyphessobrycon notidanos is distinguished from its congeners by the combination of an elongate dorsal fin in mature males, a vertically elongate humeral spot, 2-4 maxillary teeth, iii,8 dorsal-fin rays, and 16 to 21 branched anal-fin rays.

  6. Confirmation of the immunoreactivity of monoclonal anti-human C-terminal EGFR antibodies in bronze Corydoras Corydoras aeneus (Callichthyidae Teleostei) by Western Blot method.

    Science.gov (United States)

    Mytych, Jennifer; Satora, Leszek; Kozioł, Katarzyna

    2017-12-12

    Bronze corydoras (Corydoras aeneus) uses the distal part of the intestine as accessory respiratory organ. Our previous study showed the presence of epidermal growth factor receptor (EGFR) cytoplasmic domain in the digestive tract of the bronze corydoras. In this study, using Western Blot method, we validated the results presented in the previous research. In detail, results of Western Blot analysis on digestive and respiratory part of bronze corydoras intestine homogenates confirmed the immunoreactivity of anti-cytoplasmic domain (C-terminal) human EGFR antibodies with protein band of approximately 180kDa (EGFR molecular weight). This indicates a high homology of EGFR domain between these species and the possibility of such antibody use in bronze corydoras. Statistically significantly higher EGFR expression was observed in the respiratory part of intestine when compared to the digestive part. This implies higher proliferation activity and angiogenesis of epithelium in this part of intestine, creating conditions for air respiration. Therefore, Corydoras aeneus may be considered as a model organism for the molecular studies of the mechanisms of epithelial proliferation initiation and inhibition depending on hypoxia and normoxia. Copyright © 2017. Published by Elsevier GmbH.

  7. La pesca de sardina, Sardinella aurita (Teleostei: Clupeidae) asociada con la variabilidad ambiental del ecosistema de surgencia costera de Nueva Esparta, Venezuela

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    Leo W. González; Jorge Euán; Nora Eslava; Jesús Suniaga

    2002-01-01

    Se comparó la pesca de sardina (Sardinella aurita) con algunos parámetros climáticos y meteorológicos del ecosistema de surgencia costera de El Morro, Nueva Esparta, Venezuela. Para el período 1996-2000, se aplicaron los modelos de regresión lineal simple y múltiple a los datos de captura en función de la velocidad del viento, temperatura superficial del mar, temperatura del aire y pluviosidad. Hubo una correlación positiva de la captura con la velocidad del viento, y una negativa con tempera...

  8. Delimiting the origin of a B chromosome by FISH mapping, chromosome painting and DNA sequence analysis in Astyanax paranae (Teleostei, Characiformes.

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    Duílio M Z de A Silva

    Full Text Available Supernumerary (B chromosomes have been shown to contain a wide variety of repetitive sequences. For this reason, fluorescent in situ hybridisation (FISH is a useful tool for ascertaining the origin of these genomic elements, especially when combined with painting from microdissected B chromosomes. In order to investigate the origin of B chromosomes in the fish species Astyanax paranae, these two approaches were used along with PCR amplification of specific DNA sequences obtained from the B chromosomes and its comparison with those residing in the A chromosomes. Remarkably, chromosome painting with the one-arm metacentric B chromosome probe showed hybridization signals on entire B chromosome, while FISH mapping revealed the presence of H1 histone and 18S rDNA genes symmetrically placed in both arms of the B chromosome. These results support the hypothesis that the B chromosome of A. paranae is an isochromosome. Additionally, the chromosome pairs Nos. 2 or 23 are considered the possible B chromosome ancestors since both contain syntenic H1 and 18S rRNA sequences. The analysis of DNA sequence fragments of the histone and rRNA genes obtained from the microdissected B chromosomes showed high similarity with those obtained from 0B individuals, which supports the intraspecific origin of B chromosomes in A. paranae. Finally, the population hereby analysed showed a female-biased B chromosome presence suggesting that B chromosomes in this species could influence sex determinism.

  9. Hepatocyte nuclear structure and subcellular distribution of copper in zebrafish Brachydanio rerio and roach Rutilus rutilus (Teleostei, Cyprinidae) exposed to copper sulphate

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    Paris-Palacios, Severine [Universite de Reims Champagne-Ardenne (URCA), UFR Sciences Exactes et Naturelles, Laboratoire d' Eco-Toxicologie, Institut International de Recherche sur les Ions Metalliques, B.P. 1039-51687 Reims cedex 2 (France)]. E-mail: severine.paris@univ-reims.fr; Biagianti-Risbourg, Sylvie [Universite de Reims Champagne-Ardenne (URCA), UFR Sciences Exactes et Naturelles, Laboratoire d' Eco-Toxicologie, Institut International de Recherche sur les Ions Metalliques, B.P. 1039-51687 Reims cedex 2 (France)]. E-mail: sylvie.biagianti@univ-reims.fr

    2006-05-10

    Copper is a trace element essential to life, but also a heavy metal with toxic effect clearly demonstrated. Cu induced perturbations in fish liver are well documented but the variability of the reported results is large. In this study two cyprinids, zebrafish and roach, were exposed to copper. Reported histocytological changes are either adaptative or degenerative depending on fish species, concentration of metal, and duration of exposure. Hepatic subcellular distribution of copper was determined by X-ray microanalysis in control and Cu-exposed roach and zebrafish. Sublethal copper sulphate contamination induced the development of a particular nucleolar alteration forming a network or honeycomb like structure in liver. This perturbation is observable in almost all the hepatocytes of zebrafish and roach exposed to copper for a minimum of 4 days of exposure. It seemed to concern more precisely the pars fibrosa. X-ray microanalysis showed that the appearance of network nucleolus was in relation to a Cu accumulation. Cu deposit was well located in the network as pars granulosa and nucloplasm showed very lower metal concentrations. The origin and consequence of network structure in nucleolus was discussed.

  10. Redescription of Neoechinorhynchus (Neoechinorhynchus) golvani Salgado-Maldonado, 1978 (Acanthocephala: Neoechinorhynchidae) and description of a new species from freshwater cichlids (Teleostei: Cichlidae) in Mexico.

    Science.gov (United States)

    Salgado-Maldonado, Guillermo

    2013-05-01

    A redescription of Neoechinorhynchus (Neoechinorhynchus) golvani Salgado-Maldonado (An Inst Biol Univ Nal Autón Méx, Ser Zool 49:35-47, 1978) is presented, based on adult specimens collected from the type host Paraneetroplus fenestratus from the type location, the Lago de Catemaco lake, Veracruz state, Mexico, and its presence is recorded in other cichlids. Detailed studies of N. (N.) golvani using light microscopy revealed some taxonomically important, previously unreported features, such as the size and shape of fully developed adult males and females, and the structure of the eggs. Morphological variability in N. (N.) golvani is described. Based on these data, the geographic distribution of this species is documented. Neoechinorhynchus (Neoechinorhynchus) panucensis n. sp. is described from Herichthys labridens (Pellegrin), Amatitlania nigrofasciata (Günther), and Herichthys cyanoguttatus Baird and Girard (all of them Cichlidae), collected in the Río Atlapexco, a tributary to the upper Río Panuco basin, Hidalgo State, Mexico. This new species stand up alone because of its minute proboscis (♂ 50 × 60, ♀ 42-55 (48.5) × 48-63 (57.7)) and anterior hooks (♂ 27-30 (28.8) × 3-5 (4), ♀ 28-32 (30) × 5 (5)). A key to the species of Neoechinorhynchus recorded from freshwater fishes in Central and South America is included.

  11. A new species of Ituglanis from the Rio Xingu Basin, Brazil, and the evolution of pelvic fin loss in trichomycterid catfishes (Teleostei: Siluriformes: Trichomycteridae).

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    Datovo, Aléssio

    2014-04-22

    A new species of the trichomycterid catfish genus Ituglanis is described from the Rio Curuá, Rio Xingu basin, Rio Amazonas drainage, Brazil. Ituglanis apteryx, new species, is promptly distinguished from congeners, except some specimens of I. parahybae (Eigenmann), by the absence of pelvic fins, girdle, and muscles. The new species differs from I. parahybae in the pattern of the cephalic laterosensory system; the absence of a posterior cranial fontanel; the presence of an epural; and the number of branchiostegal rays, ribs, and vertebrae. Ituglanis apteryx is one among the several trichomycterids lacking pelvic fins. Analysis reveals that pelvic fin loss independently evolved several times during the trichomycterid radiation.

  12. Quadriacanthus species (Monogenea: Dactylogyridae) from catfishes (Teleostei: Siluriformes) in eastern Africa: new species, new records and first insights into interspecific genetic relationships.

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    Francová, Kateřina; Seifertová, Mária; Blažek, Radim; Gelnar, Milan; Mahmoud, Zuheir N; Řehulková, Eva

    2017-08-01

    African catfishes of the families Bagridae and Clariidae are known to be parasitized with monogeneans of Quadriacanthus Paperna, 1961 (Dactylogyridae). The genus remains taxonomically challenging due to its speciose nature and relatively wide host range representing two fish orders, i.e. Siluriformes and Osteoglossiformes, in Africa and Asia. Here, we investigated diversity of Quadriacanthus spp. parasitizing Clarias gariepinus (Burchell), Heterobranchus bidorsalis Geoffroy Saint-Hilaire, and Bagrus docmak (Forsskål) collected in the Lake Turkana (Kenya) and Nile River Basin (Sudan). The interspecific relationships among Quadriacanthus spp. parasitizing catfishes inferred from ribosomal DNA sequences were investigated for the first time. A combined morphological and molecular approach was used for description of the new species and for a critical review of the previously described Quadriacanthus spp., by means of phase contrast microscopic examination of sclerotized structures, and assessing the genetic divergence among the species found using rDNA sequences. Seven species (including four new) of Quadriacanthus were identified. These were as follows: Quadriacanthus aegypticus El-Naggar & Serag, 1986, Quadriacanthus clariadis Paperna, 1961, Quadriacanthus fornicatus n. sp., Quadriacanthus pravus n. sp., and Quadriacanthus zuheiri n. sp. from Clarias gariepinus (Clariidae); Quadriacanthus mandibulatus n. sp. from Heterobranchus bidorsalis (Clariidae); and Quadriacanthus bagrae Paperna, 1979 from Bagrus docmak (Bagridae). For both 18S-ITS1 and 28S rDNA regions, Q. clariadis from a clariid fish was found to be most closely related to Q. bagrae from a bagrid host. Quadriacanthus mandibulatus n. sp. was observed to be the most distant species from the others. The separation of Q. mandibulatus n. sp. from the other species corresponds with the different morphology of its copulatory tube. The copulatory tube is terminally enlarged in Q. mandibulatus n. sp., while the tube in all other congeners studied is comparatively small and with an oblique tapering termination. This study contributes to a better understanding of African dactylogyrid diversity and provides the first molecular characterization of Quadriacanthus spp. The observed interspecific genetic relationships among Quadriacanthus spp. from clariids and Q. bagrae from a bagrid host suggest a possible host-switching event in the evolutionary history of the genus. Our records extend the currently known geographical range for Quadriacanthus spp. to Kenya and Sudan.

  13. Localization of 18S ribosomal genes in suckermouth armoured catfishes Loricariidae (Teleostei, Siluriformes) with discussion on the Ag-NOR evolution

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    Alves, Anderson Luis; de Borba, Rafael Splendore; Pozzobon, Allan Pierre Bonetti; Oliveira, Claudio; Nirchio, Mauro; Granado, Angel; Foresti, Fausto

    2012-01-01

    Abstract The family Loricariidae with about 690 species divided into six subfamilies, is one of the world’s largest fish families. Cytogenetic studies conducted in the family showed that among 90 species analyzed the diploid number ranges from 2n=38 in Ancistrus sp. to 2n=96 in Hemipsilichthys gobio Luetken, 1874. In the present study, fluorescence in situ hybridization (FISH) was employed to determine the chromosomal localization of the 18S rDNA gene in four suckermouth armoured catfishes: Kronichthys lacerta (Nichols, 1919), Pareiorhaphis splendens (Bizerril, 1995), Liposarcus multiradiatus (Hancock, 1828) and Hypostomus prope plecostomus (Linnaeus, 1758). All species analyzed showed one chromosome pair with 18S rDNA sequences, as observed in the previous Ag-NORs analyses. The presence of size and numerical polymorphism was observed and discussed, with proposing a hypothesis of the Ag-NOR evolution in Loricariidae. PMID:24260671

  14. Destructive and non-destructive microanalysis of biocarbonates applied to anomalous otoliths of archaeological and modern sciaenids (Teleostei) from Peru and Chile.

    Science.gov (United States)

    Béarez, Philippe; Carlier, Gabriel; Lorand, Jean-Pierre; Parodi, Gian-Carlo

    2005-03-01

    Anomalous otoliths were discovered among modern and archaeological (8th millennium BP) sciaenids. The two species concerned, Cilus gilberti and Sciaena deliciosa, are common on the Peruvian-Chilean coast and do not seem to be affected by this morphological anomaly that maintained in their populations for thousands of years. The carbonates of the anomalous forms, determined by X-ray diffraction, are different from that of the normal otoliths, i.e. calcite and vaterite instead of aragonite. A method of non-destructive analysis by cathodoluminescence is tested and assumptions on the origin of the anomaly and its possible implications on environmental studies are advanced.

  15. Neoplecostomus doceensis: a new loricariid species (Teleostei, Siluriformes from the rio Doce basin and comments about its putative origin

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    Fábio Roxo

    2014-09-01

    Full Text Available A new species of Neoplecostomus is described from the rio Doce basin representing the first species of this genus in the basin. The new species is distinguished from its congeners byenlarged, fleshy folds between dentaries, two or three series of developed papillae anterior to premaxillary teeth and a adipose-fin membrane present, and by lacking enlarged odontodes along snout lateral margins in mature males, a well-developed dorsal-fin spinelet wider than dorsal-fin spine base, lower number of lateral-line plates and developed membrane on the dorsal portion of the first, second and third pelvic-fin branched rays. Additionally, we present a brief discussion of biogeographic scenarios that may explain the distribution of the new species in the rio Doce basin. We suggested that the ancestral lineage of the new species reached the rio Doce from the upper portions of rio Paraná drainages about 3.5 Mya (95% HPD: 1.6–5.5 indicating a colonization route of the N. doceensis ancestral lineage from the south end of Serra do Espinhaço, probably as a result of headwater capture processes between the upper rio Paraná and rio Doce basins.

  16. A review of the Pseudobarbus afer (Peters, 1864 species complex (Teleostei, Cyprinidae in the eastern Cape Fold Ecoregion of South Africa

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    Albert Chakona

    2017-02-01

    Full Text Available The Eastern Cape redfin, Pseudobarbus afer, has long been considered to be a single widespread and variable species occurring in multiple isolated river systems in the Cape Fold Ecoregion (CFE at the southern tip of Africa. Mitochondrial cytochrome b and control region sequence data of individuals from populations currently assigned to P. afer across the species’ distribution range revealed existence of four deeply divergent taxonomic units: (i the Mandela lineage confined to the Sundays, Swartkops and Baakens river systems, (ii the Krom lineage endemic to the Krom River system, (iii the St Francis lineage occurring in the Gamtoos and adjacent river systems, and (iv the Forest lineage occurring in several coastal river systems from the Tsitsikamma to the Klein Brak River system. The Forest lineage is closely related to P. phlegethon from the Olifants River system on the west coast of South Africa, suggesting that it does not belong to P. afer s.l. Herein we focus on the three lineages within the P. afer s.l. complex and provide new diagnosis for P. afer s.s (Mandela lineage, revalidate P. senticeps (Krom lineage as a distinct species, and describe a new species P. swartzi (St Francis lineage. The three species exhibit subtle differences, which explains why they were previously considered to represent a single variable and widespread species. Pseudobarbus senticeps differs from both P. afer and P. swartzi by having fewer (i.e. larger scales (25–33, mode 29 lateral line scale series; 10–12, mode 11 circumpeduncular scales and presence of a lateral stripe which terminates in a conspicuous triangular blotch at the base of the caudal fin. Long barbels which reach or surpass the vertical through the posterior edge of the eye further separate P. senticeps from P. afer s.s. which possesses simple short barbels which do not reach the vertical through the posterior margin of the eye. Pseudobarbus afer s.s differs from P. swartzi sp. n. by possession of fewer scale rows along the lateral line (29–35, mode 32 vs 34–37, mode 36 in P. swartzi, fewer scales around the caudal peduncle (12–16, mode 12 vs 13–17, mode 16 in P. swartzi and a distinct mesh or net-like pigmentation pattern on latero-ventral scales.

  17. Phylogenetic analysis of molecular and morphological data highlights uncertainty in the relationships of fossil and living species of Elopomorpha (Actinopterygii: Teleostei).

    Science.gov (United States)

    Dornburg, Alex; Friedman, Matt; Near, Thomas J

    2015-08-01

    Elopomorpha is one of the three main clades of living teleost fishes and includes a range of disparate lineages including eels, tarpons, bonefishes, and halosaurs. Elopomorphs were among the first groups of fishes investigated using Hennigian phylogenetic methods and continue to be the object of intense phylogenetic scrutiny due to their economic significance, diversity, and crucial evolutionary status as the sister group of all other teleosts. While portions of the phylogenetic backbone for Elopomorpha are consistent between studies, the relationships among Albula, Pterothrissus, Notacanthiformes, and Anguilliformes remain contentious and difficult to evaluate. This lack of phylogenetic resolution is problematic as fossil lineages are often described and placed taxonomically based on an assumed sister group relationship between Albula and Pterothrissus. In addition, phylogenetic studies using morphological data that sample elopomorph fossil lineages often do not include notacanthiform or anguilliform lineages, potentially introducing a bias toward interpreting fossils as members of the common stem of Pterothrissus and Albula. Here we provide a phylogenetic analysis of DNA sequences sampled from multiple nuclear genes that include representative taxa from Albula, Pterothrissus, Notacanthiformes and Anguilliformes. We integrate our molecular dataset with a morphological character matrix that spans both living and fossil elopomorph lineages. Our results reveal substantial uncertainty in the placement of Pterothrissus as well as all sampled fossil lineages, questioning the stability of the taxonomy of fossil Elopomorpha. However, despite topological uncertainty, our integration of fossil lineages into a Bayesian time calibrated framework provides divergence time estimates for the clade that are consistent with previously published age estimates based on the elopomorph fossil record and molecular estimates resulting from traditional node-dating methods. Copyright © 2015 Elsevier Inc. All rights reserved.

  18. [Hyphessobrycon taphorni and H. eschwartzae (Teleostei: Characidae) two new species of fish in the basin of Madre de Dios river, Peru].

    Science.gov (United States)

    Garcia-Alzate, Carlos A; Romin-Valencia, César; Ortega, Hernán

    2013-06-01

    Hyphessobrycon with 129 valid species, is a genus of fish that has a great diversity of species in the Neotropical ichthyofauna, reaches its greatest diversity in the Amazon basin with about 70% of these species, is highly desired by hobbyists because of their beauty and color, and are still meeting new species. We analyzed specimens from the Departamento de Ictiología, Museo de Historia Natural de la Universidad Mayor de San Marcos, Lima, Perú (MUSM); and measurements of the specimens were taken point to point with digital calipers. Observations of bone and cartilage structures were made on cleared and stained (C&S) samples. The morphometric relationships between species using 21 variables were explored using a principal component analysis (PCA). Here we describe two new species, Hyphessobrycon taphorni and H. eschwartzae from the Madre de Dios River drainage, Peru. Hyphessobrycon taphorni sp. n. can be distinguished by the number of dorsal-fin rays (iii, 8), by the number of: pored lateral-line scales (4-5), teeth in the outer premaxillary row (1-2), teeth in the inner premaxillary row (7-8), by: the caudal-peduncle length (11.4-16.4% SL), number of lateral scales (28-29, except from H. loretoensis which has 29-30) and absence of a humeral spot (vs. present), it differs from H. loretoensis by the number of: scales between the lateral line and the anal fin origin (4 vs. 3) and maxillary teeth (2 vs. 3-4), and it differs from H. agulha by the number of branched pectoral-fin rays (11-12 vs. 9-10). Hyphessobrycon eschwartzae sp. n. is distinguished by the number of: simple anal-fin rays (iv), teeth on the dentary (13-15), teeth in the inner premaxillary row (6), teeth in the outer premaxillary row (3, except from H. heterorhabdus and H. loretoensis which have 3-4); it differs from H. loretoensis by the number of: pored lateral-line scales (7 vs. 9-10), scales between the lateral line and the dorsal-fin origin (5 vs. 3-4); it differs from H. agulha in the number of lateral scales (30-31 vs. 33-34), by the number of: predorsal scales (9 vs. 10), maxillary teeth (4 vs. 0-1); in having in life a red lateral stripe above the dark lateral stripe that extends from the posterior part of the opercle to the caudal peduncle (vs. absent) and by the presence of bony hooks in mature males only on the anal fin (vs. hooks on all fins, including the caudal).

  19. Phylogenetic diagnosis and expanded description of the genus Mazarunia Kullander, 1990 (Teleostei: Cichlidae from the upper Mazaruni River, Guyana, with description of two new species

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    Hernán López-Fernández

    Full Text Available We expand the description of the genus Mazarunia Kullander, 1990, explore morphological diagnostic characters for the genus and for its sister-group relationship with Guianacara Kullander & Nijssen, 1989 in a phylogenetic context, expand the description of M. mazarunii and describe two new species. Mazarunia can be diagnosed by the combination of numerous anatomical traits, including the unique loss of infraorbital 6, the configuration of the first epibranchial in two of the species, a well-developed posteroventral lateral expansion of the palatine that is largely contiguous with the ectopterygoid, the absence of a suture between the hyomandibular and the metapterygoid, the absence of an interarcual cartilage, fourth ceratobranchial with 2 or 3 tooth plates, a caudally scaled interoperculum, equal-sized scales in the ventral and lateral chest regions, a simple, disjunct pattern of lateral line squamation, and smooth preopercle, supracleithrum and extrascapula. Species of Mazarunia can be further distinguished from species of their sister-genus Guianacara by their distinct color patterns. Mazarunia charadrica, new species, can be distinguished from other species of Mazarunia, among other characters, by approximately equal uncinate process and anterior arm and reduced anteroventral expansion of epibranchial 1 (vs. uncinate process narrower and complete anteroventral expansion in the other two species, a dorso-ventrally flattened maxillary process of the palatine (vs. cylindrical in the other two species, cycloid (vs. ctenoid scales in the opercular, postorbital, lateral chest and anal-genital regions, the absence of a mid-lateral spot, and a diffuse dark area covering the dorsal portion of the head giving the impression of a "black cap". Mazarunia charadrica has a unique juvenile pattern of seven vertical dark bars partially preserved in adults. Bars 3-6 in antero-caudal direction are most visible in juveniles and medium-sized specimens but become fainter and almost disappear in adults. Many specimens show only bar number 3 (midlateral bar. Mazarunia mazarunii can be distinguished from all other species of Mazarunia by the presence of two foramina (vs. one on the lateral face of the ascending process of the premaxilla, a lachrymal bone that is longer than deep (vs. deeper than long, an infraorbital 3 that is contiguous but not overlapping with the lachrymal (vs. overlapping, ctenoid scales (vs. cycloid on the subopercle, interopercle and chest, and by its unique coloration, including complete suborbital and supraorbital stripes, and being the only species of Mazarunia with a discernible lateral band formed by the mid-line blotching pattern associated with lateral bars. In large adults, M. mazarunii has a black or dark bar behind the head that produces the impression of a collar. Mazarunia pala, new species, can be distinguished from its congeners by the absence of a parhypurapophysis, the presence of a dorsal-fin scaly pad with ctenoid scales (vs. no scaly pad in M. charadrica and M. mazarunii, a small suborbital stripe limited to the preopercle, the absence of clearly discernible lateral bars on the body, and by its general pinkish coloration with midlateral spot as the only melanic marking. All known species of Mazarunia are restricted to the upper reaches of the Mazaruni River basin in Guyana.

  20. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae: physical mapping of ribosomal genes and telomeric sequences

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    Priscilla Scacchetti

    2011-08-01

    Full Text Available Conventional (Giemsa, C-Banding, Ag-NORs, CMA3 and molecular (5S rDNA, 18S rDNA, telomeric sequences cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (G. sylvius Albert and Fernandes-Matioli, 1999, G. inaequilabiatus Valenciennes, 1839, G. pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758 from different Brazilian hydrographic basins. G. sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st, G. pantherinus presented 52 chromosomes (32m+18sm+2st, while G. inaequilabiatus (42m+10sm+2a and G. cf. carapo (38m+12sm+4st presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of G. inaequilabiatus, G. cf. carapo, and G. pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in G. inaequilabiatus, G. cf. carapo, and G. pantherinus, and on pair 2 in G. sylvius. CMA3 staining revealed additional unrelated NORs marks in G. sylvius and G. pantherinus. The 5S rDNA probes revealed signals on one pair in G. sylvius and two pairs in G. pantherinus; G. inaequilabiatus had about seventeen pairs marked, and G. cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of G. inaequilabiatus and G. cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of G. sylvius by telomeric probes (TTAGGGn indicating the possible occurrence of chromosomal fusions in this species. The present study reveals valuable cytotaxonomic markers for this group and allows a more precise evaluation of the processes involved in the karyotype differentiation and the interrelationships among different species of the genus Gymnotus.

  1. Estrutura populacional e biologia reprodutiva de Menticirrhus americanus (Linnaeus, 1758 (Teleostei, Sciaenidae na baía de Ubatuba-Enseada, Santa Catarina, Brasil

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    Matheus Oliveira Freitas

    2011-01-01

    primeira maturação gonadal (L50 foi estimado em 16,7cm para fêmeas e 15,4cm para machos. O período reprodutivo ocorreu nas estações quentes, e a espécie apresentou desova múltipla. O índice hepatossomático apresentou variação sazonal similar à descrita para o índice gonadossomático, e pode ser considerado bom indicador da desova. O fator de condição não foi um bom indicador do período de desova, mas esteve relacionado com o processo de recuperação e maturação das gônadas. Características da dinâmica populacional mostraram que M. americanus utiliza a área de estudo para reprodução e recrutamento.

  2. A review of the Tripterygion tripteronotus (Risso, 1810 complex, with a description of a new species from the Mediterranean Sea (Teleostei: Tripterygiidae

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    Josep Carreras-Carbonell

    2007-03-01

    Full Text Available We compared specimens of Tripterygion tripteronotus from 52 localities of the Mediterranean Sea and adjacent waters, using four gene sequences (12S rRNA, tRNA-valine, 16S rRNA and COI and morphological characters. Two well-differentiated clades with a mean genetic divergence of 6.89±0.73% were found with molecular data, indicating the existence of two different species. These two species have disjunctive geographic distribution areas without any molecular hybrid populations. Subtle but diagnostic morphological differences were also present between the two species. T. tripteronotus is restricted to the northern Mediterranean basin, from the NE coast of Spain to Greece and Turkey, including the islands of Malta and Cyprus. T. tartessicum n. sp. is geographically distributed along the southern coast of Spain, from Cape of La Nao to the Gulf of Cadiz, the Balearic Islands and northern Africa, from Morocco to Tunisia. According to molecular data, these two species could have diverged during the Pliocene glaciations 2.7-3.6 Mya.

  3. Taxonomic review of the species of Mugil (Teleostei: Perciformes: Mugilidae) from the Atlantic South Caribbean and South America, with integration of morphological, cytogenetic and molecular data.

    Science.gov (United States)

    Menezes, Naércio A; Nirchio, Mauro; De Oliveira, Cláudio; Siccharamirez, Raquel

    2015-01-10

    Analysis of morphological, molecular and cytological data helped to define and more precisely characterize the species of Mugil from the Atlantic coasts of South Caribbean and South America, allowing a correction of prior misidentifications and distributional ranges. A new species from Venezuela is described and all the species from the area are redescribed. It is demonstrated that the apparent similarity in morphological traits, which contradicted the results from recent molecular studies, is the result of the misuse of traditional morphological characters, and thus both the molecular and cytological data instead are congruent with the morphological differences that are found among mullet species. The presence of Mugil hospes Jordan & Culver in the western south Atlantic is refuted based on the comparison of type material of this species with specimens from this area that also indicated a very significant morphological difference, what on the other hand justifies the recognition of these specimens as Mugil brevirostris (Ribeiro). The distribution of Mugil incilis Hancock is restricted and the similarities among the species formerly depicted in a prior dendrogram is modified following the inclusion of recently obtained molecular data for Mugil curvidens Valenciennes.

  4. Os Sciaenidae (Teleostei: Perciformes da Baía de Santos (SP, Brasil Scianed fishes (Teleostel: Perciformes from Baía de Santos (SP, Brazil

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    Roberto Giannini

    1990-06-01

    Full Text Available A fim de se determinar os padrões de distribuição e de repartição temporal e espacial das espécies de peixes da família Sciaenidae na Baía de Santos, foram efetuadas amostras mensais diurnas com arrastos de praia e de fundo, de março de 1985 a maio de 1986. O estudo foi baseado na comparação das variações espaciais e temporais da ocorrência e abundância e na análise da influência de parâmetros ambientais. Vinte espécies de cienídeos foram coletadas na região, todas ocorrendo nos arrastos de fundo e nove nos arrastos de praia. Dentre essas, Stelliferrastrifer, Isopisthus parvipinnis, Paralonchurus brasiliensis, Micropogonias fumieri, Stellifer brasiliensis, Menticirrhus americanus e Menticirrhus littoralis, estiveram presentes durante todo o período, contribuindo com mais de 90 % do total capturado na Baía de Santos e região de praias adjacentes. A coexistência dessas espécies foi possível devido à alternância das ocorrências e dos picos de abundância em função das épocas do ano, da área de amostragem e da variação da temperatura e salinidade da água. S. rastrifer ocorreu preferencialmente nos arrastos de fundo, no inverno, em águas frias e de profundidade e salinidade medianas e em todos os setores de amostragem. I. parvipinnis, P brasiliensis e S. brasiliensis ocorreram preferencialmente nos arrastos de fundo, no inverno, primavera e outono, respectivamente, em águas frias, profundas e mais salinas e nos setores mais externos. M. furnieri e M. americanus ocorreram nos arrastos de fundo e de praia e, preferencialmente, no verão, em águas quentes, rasas e menos salinas e nos setores mais internos. M. littoralis ocorreu preferencialmente nos arrastos de praia, no inverno, em águas frias e em todas as estações de amostragem.The purpose of this study was to describe the occurrence and the spatial partitioning of the most abundant juvenile sciaenid fishes in the Bay of Santos, based upon the variability in the occurrence and abundance and influence of environmental factors. Monthly diurnal beach seine haul and bottom trawl samples were made between March 1985 and May 1986. Twenty species of sciaenid fishes were collected in the region, all occurrying in bottom trawls and nine of them in beach seine hauls. Among them, Stellifer rastrifer, Isopisthus parvipinnis, Paralonchurus brasiliensis, Micropogonias furnieri, Stellifer brasiliensis, Menticirrhus americanus and Menticirrhus littoralis were found year-round and constituted more than 90 % of total catches from the Bay of Santos and adjacent beach region; their coexistence was possible due to seasonal and spatial differences in relative abundance and due to water temperature and salinity influence. S. rastrifer occurred mainly in bottom trawls, during winter, in colder waters with medium depth and salinity and in all strata. /. parvipinnis, P. brasiliensis and S. brasiliensis occurred mainly in bottom trawls, during winter, spring and fall, respectively, in colder, deeper and saltier waters and in outer strata. M. furnieri and M. americanus occurred in bottom trawls and beach seine hauls and, mainly, during summer, in warmer, shallower and with less salinity waters and in inner strata. A/, littoralis occurred mainly in beach seine hauls, during winter, in colder waters and in all sample stations.

  5. Estudo morfológico dos otólitos Sagitta, Asteriscus e Lapillus de teleósteos (Actinopterygii, teleostei) de Portugal Continental

    OpenAIRE

    Assis, Carlos António da Silva, 1961-

    2000-01-01

    Tese de doutoramento em Biologia (Ecologia e Biossistemática), apresentada à Universidade de Lisboa através da Faculdade de Ciências, 2001 Os otólitos são concreções acelulares de carbonato de cálcio e outros sais inorgânicos, que se desenvolvem sobre uma matriz proteica no ouvido interno dos vertebrados. Nos peixes ósseos, os otólitos são em número de três pares, sagittae, asterisci e lapilli, e atingem normalmente dimensões apreciáveis, preenchendo quase completamente a cavidade interna ...

  6. Ecología poblacional de Cyprinus carpio (TELEOSTEI) en los Humedales de Ajó, Buenos Aires

    OpenAIRE

    Maiztegui, Tomás

    2016-01-01

    Este trabajo tuvo como objetivo principal conocer la biología y ecología poblacional de la carpa común (Cyprinus carpio) en los Humedales de Ajó, con el fin de aportar información que permita diseñar estrategias enfocadas en el manejo de esta especie exótica dentro de esta área protegida. La hipótesis central se basó en comprobar que la carpa común en los Humedales de Ajó ha encontrado un ambiente propicio para el desarrollo de una población local auto-sostenida y se convirtió en la especie d...

  7. Distinguishing between incomplete lineage sorting and genomic introgressions: complete fixation of allospecific mitochondrial DNA in a sexually reproducing fish (Cobitis; Teleostei, despite clonal reproduction of hybrids.

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    Lukas Choleva

    Full Text Available Distinguishing between hybrid introgression and incomplete lineage sorting causing incongruence among gene trees in that they exhibit topological differences requires application of statistical approaches that are based on biologically relevant models. Such study is especially challenging in hybrid systems, where usual vectors mediating interspecific gene transfers--hybrids with Mendelian heredity--are absent or unknown. Here we study a complex of hybridizing species, which are known to produce clonal hybrids, to discover how one of the species, Cobitis tanaitica, has achieved a pattern of mito-nuclear mosaic genome over the whole geographic range. We appplied three distinct methods, including the method using solely the information on gene tree topologies, and found that the contrasting mito-nuclear signal might not have resulted from the retention of ancestral polymorphism. Instead, we found two signs of hybridization events related to C. tanaitica; one concerning nuclear gene flow and the other suggested mitochondrial capture. Interestingly, clonal inheritance (gynogenesis of contemporary hybrids prevents genomic introgressions and non-clonal hybrids are either absent or too rare to be detected among European Cobitis. Our analyses therefore suggest that introgressive hybridizations are rather old episodes, mediated by previously existing hybrids whose inheritance was not entirely clonal. Cobitis complex thus supports the view that the type of resulting hybrids depends on a level of genomic divergence between sexual species.

  8. Chromosomal differentiation between populations of Oligosarcus hepsetus (Teleostei, Characidae from small tributaries at opposite margins of the Paraíba do Sul river (Brazil

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    Liano Centofante

    2006-11-01

    Full Text Available Cytogenetic analyses were carried out in two populations of Oligosarcus hepsetus from tributaries at opposite margins of the Paraíba do Sul river. The same diploid number was observed in both populations (2n=50, but they showed remarkable differences related to karyotype formula and distribution of rDNA sites as revealed by silver nitrate staining and in situ hybridization with 18S probes. The results suggested that the main channel of the Paraíba do Sul river acted as barrier to gene flow between populations.Análises citogenéticas foram realizadas em duas populações de Oligosarcus hepsetus provenientes de riachos de margens opostas do rio Paraíba do Sul. O número diplóide foi o mesmo para ambas as populações (2n=50, porém diferenças significativas foram observadas com relação à fórmula cariotípica e distribuição dos sítios de DNAr detectados pela impregnação por prata e pela hibridação "in situ" com sonda 18S. Estes resultados sugerem que a calha principal do rio Paraíba do Sul estaria atuando como uma barreira para o fluxo gênico entre essas populações.

  9. A multi-approach analysis of the genetic diversity in populations of Astyanax aff. bimaculatus Linnaeus, 1758 (Teleostei: Characidae from Northeastern Brazil

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    Vanessa de Carvalho Cayres Pamponet

    Full Text Available Few reports are available about the ichthyofauna of typical semi-arid rivers, although the regional diversity has been constantly threatened by human activities, mainly related to impoundment and construction of dams. The goal of the present work was to evaluate using different methods, the population genetic structure of a characin fish, Astyanax aff. bimaculatus, widespread throughout hydrographic basins of Bahia, Northeastern Brazil. Morphological (meristic and morphometric data, cytogenetic (karyotype and Ag-NOR, and molecular (RAPD and SPAR analyses were carried out in specimens collected upstream and downstream of Pedra Dam, in the main channel of Contas River (Contas River Basin, and in the Mineiro stream, which belongs to the adjacent Recôncavo Sul basin. Few external differences were detected among populations, where the individuals collected upstream of Pedra Dam were slightly larger than the others. Cytogenetic data also showed a similar karyotypic pattern (2n=50; 6m+28sm+12st+4a; FN= 96 and NORs located on the short arms of up to two chromosome pairs, with numerical inter- and intra-populational variation. Nonetheless, RAPD and SPAR analyses differentiated reliably the three populations, revealing striking differences in the allele frequencies among the localities studied and a significant difference in population structure index (Fst=0.1868, P<0.0001. The differences between populations within a same river were as significant as those between distinct hydrographic basins, indicating that the dam/reservoir represents an effective barrier to gene flow. Additionally, environmental peculiarities from each locality are also believed to influence the genetic patterns detected herein. On the other hand, the similarity between samples from Contas River and Recôncavo Sul basins could be related to a common evolutionary history, since both basins are geographically close to each other. Finally, the present study shows that a multi-approach analysis is particularly useful in identifying the population structure of widely distributed species and to evaluate the impacts of human activities on natural fish populations.

  10. Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae): physical mapping of ribosomal genes and telomeric sequences

    Science.gov (United States)

    Scacchetti, Priscilla Cardim; Pansonato-Alves, José Carlos; Utsunomia, Ricardo; Oliveira, Claudio; Foresti, Fausto

    2011-01-01

    Abstract Conventional (Giemsa, C-Banding, Ag-NORs, CMA3) and molecular (5S rDNA, 18S rDNA, telomeric sequences) cytogenetic studies were carried out in specimens of ten distinct fish populations of the genus Gymnotus (Gymnotus sylvius Albert and Fernandes-Matioli, 1999, Gymnotus inaequilabiatus Valenciennes, 1839, Gymnotus pantherinus Steindachner, 1908, and G. cf. carapo Linnaeus, 1758) from different Brazilian hydrographic basins. Gymnotus sylvius presented a diploid number of 40 chromosomes (22m+12sm+6st), Gymnotus pantherinus presented 52 chromosomes (32m+18sm+2st), while Gymnotus inaequilabiatus (42m+10sm+2a)and Gymnotus cf. carapo (38m+12sm+4st) presented 54 chromosomes. The C-banding technique revealed centromeric marks in all chromosomes of all species. Besides that, conspicuous blocks of heterochromatin were found interstitially on the chromosomes of Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus. All four species showed single nucleolus organizing regions confirmed by results obtained through Ag-NORs and FISH experiments using 18S rDNA probes, which showed the NORs localized on the first chromosome pair in Gymnotus inaequilabiatus, Gymnotus cf. carapo,and Gymnotus pantherinus, and on pair 2 in Gymnotus sylvius. CMA3 staining revealed additional unrelated NORs marks in Gymnotus sylvius and Gymnotus pantherinus. The 5S rDNA probes revealed signals on one pair in Gymnotus sylvius and two pairs in Gymnotus pantherinus; Gymnotus inaequilabiatus had about seventeen pairs marked, and Gymnotus cf. carapo had about fifteen pairs marked. It is considered that the high amount of heterochromatin identified in the chromosomes of Gymnotus inaequilabiatus and Gymnotus cf. carapo could have facilitated the dispersion of 5S rDNA in these species. Interstitial signals were detected on the first metacentric pair of Gymnotus sylvius by telomeric probes (TTAGGG)n indicating the possible occurrence of chromosomal fusions in this species. The present study reveals valuable cytotaxonomic markers for this group and allows a more precise evaluation of the processes involved in the karyotype differentiation and the interrelationships among different species of the genus Gymnotus. PMID:24260631

  11. The phylogenetic intrarelationships of spiny-rayed fishes (Acanthomorpha, Teleostei, Actinopterygii: fossil taxa increase the congruence of morphology with molecular data

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    Donald Davesne

    2016-11-01

    Full Text Available Acanthomorpha (spiny-rayed fishes is a clade of teleosts that includes more than 15 000 extant species. Their deep phylogenetic intrarelationships, first reconstructed using morphological characters, have been extensively revised with molecular data. Moreover, the deep branches of the acanthomorph tree are still largely unresolved, with strong disagreement between studies. Here, we review the historical propositions for acanthomorph deep intrarelationships and attempt to resolve their earliest branching patterns using a new morphological data matrix compiling and revising characters from previous studies. The taxon sampling we use constitutes a first attempt to test all previous hypotheses (molecular and morphological alike with morphological data only. Our sampling also includes Late Cretaceous fossil taxa, which yield new character state combinations that are absent in extant taxa. Analysis of the complete morphological data matrix yields a new topology that shows remarkable congruence with the well-supported molecular results. Lampridiformes (oarfishes and allies are the sister to all other acanthomorphs. Gadiformes (cods and allies and Zeiformes (dories form a clade with Percopsiformes (trout-perches and the enigmatic Polymixia (beardfish and Stylephorus (tube-eye. Ophidiiformes (cusk-eels and allies and Batrachoidiformes (toadfishes are nested within Percomorpha, the clade that includes most of modern acanthomorph diversity. These results provide morphological synapomorphies and independent corroboration of clades previously only recovered from molecular data, thereby suggesting the emergence of a congruent picture of acanthomorph deep intrarelationships. Fossil taxa play a critical role in achieving this congruence, since a very different topology is found when they are excluded from the analysis.

  12. Effects of calcitonin on plasma calcium and phosphate in the mudskipper, Periophthalmodon schlosseri (Teleostei), in water and during exposure to air.

    Science.gov (United States)

    Fenwick, J C; Lam, T J

    1988-05-01

    After 7 days in air on wet filter paper mudskippers had normal body weight and normal levels of plasma sodium, potassium, and phosphate. They were, however, significantly hypercalcemic. The hypercalcemia could be reduced by the daily intraperitoneal injection of synthetic eel calcitonin (1.67 microgram kg-1 day-1) and this effect was dose dependent with a maximal response at a dose of 3.33 micrograms kg-1 day-1. Calcitonin had no effect on plasma calcium levels of fish held in water but did induce significant hyperphosphatemia whether the fish were held in water or in air on wet filter paper with this effect being greater under the latter conditions. The hypocalcemic action of calcitonin was restricted to conditions under which the fish displayed patent hypercalcemia. Under no conditions did calcitonin produce significant hypocalcemia so it appears that the action of synthetic eel calcitonin in the mudskipper, Periophthalmodon schlosseri, is dependent upon the presence of excess plasma calcium and is thus more accurately described as being anti-hypercalcemic rather than hypocalcemic.

  13. Morphometric and molecular characterisation of specimens of Lepidapedon Stafford, 1904 (Digenea: Lepidapedidae) from the deep-sea fish Mora moro (Risso) (Teleostei: Moridae) in the western Mediterranean.

    Science.gov (United States)

    Dallarés, Sara; Georgieva, Simona; Kostadinova, Aneta; Carrassón, Maite; Gibson, David I; Pérez-del-Olmo, Ana

    2013-07-01

    In a study of the parasites of the deep-sea fish Mora moro (Risso) (Gadiformes: Moridae) off the Mediterranean coasts of Catalonia and the Balearic Islands (Spain), we were able to distinguish two morphs of specimens belonging to Lepidapedon Stafford, 1904 (Digenea: Lepidapedidae). This material is herein described and illustrated. Comparative sequence analyses using partial mitochondrial nad1 sequences revealed that the material assigned to one of these morphs can be considered conspecific with the material identified as Lepidapedon desclersae Bray & Gibson, 1995 from the same host. However, the published nad1 sequence for L. desclersae was generated from a specimen ex M. moro from the North East Atlantic. Examination of the voucher specimens associated with this sequence revealed that both the North East Atlantic and the Mediterranean specimens ex M. moro differ from L. desclersae as described from its type-host, Lepidion eques (Günther), in the anterior extent of the vitelline fields which is further posterior, reaching only to the posterior margin of the external seminal vesicle in L. desclersae, versus being at the mid-level of this organ and reaching the posterior margin of the ventral sucker. Therefore, we have tentatively assigned the material characterised here, both morphologically and molecularly as Lepidapedon sp. Acquisition of additional sequences for both nad1 mitochondrial and 28S rRNA genes of L. desclersae from material ex Lepidion spp. is required in order to determine whether the observed morphometric variation reflects host-related or inter-specific differences. The second morph of Lepidapedon from M. moro is described and distinguished on morphometric grounds, such as the position of the most anterior vitelline follicles, which reach to the anterior margin of the ventral sucker. Its identity is commented upon, but, in view of the fact that there were few specimens and no molecular data available, it is not named.

  14. A new genus and species of blind sleeper (Teleostei: Eleotridae) from Oaxaca, Mexico: First obligate cave gobiiform in the Western Hemisphere

    Science.gov (United States)

    Walsh, Stephen J.; Chakrabarty, Prosanta

    2016-01-01

    Caecieleotris morrisi, new genus and species of sleeper (family Eleotridae), is described from a submerged freshwater cave in a karst region of the northern portion of the State of Oaxaca, Mexico, Río Papaloapan drainage, Gulf of Mexico basin. The new species represents the first cave-adapted sleeper known from the Western Hemisphere and is one of only 13 stygobitic gobiiforms known worldwide, with all others limited in distribution to the Indo-Pacific region. The new taxon represents a third independent evolution of a hypogean lifestyle in sleepers, the others being two species ofOxyeleotris (O. caeca and O. colasi) from New Guinea and a single species, Bostrychus microphthalmus, from Sulawesi. Caecieleotris morrisi, new species, is distinguished from epigean eleotrids of the Western Atlantic in lacking functional eyes and body pigmentation, as well as having other troglomorphic features. It shares convergent aspects of morphology with cave-dwelling species of Oxyeleotris and B. microphthalmus but differs from those taxa in lacking cephalic pores and head squamation, among other characters. Description of C. morrisi, new species, brings the total number of eleotrid species known from Mexico to 12. Seven of these, including the new species, occur on the Atlantic Slope.

  15. Identification of Astyanax altiparanae (Teleostei, Characidae in the Iguaçu River, Brazil, based on mitochondrial DNA and RAPD markers

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    Prioli Sônia M.A.P.

    2002-01-01

    Full Text Available Astyanax fishes are among the most important food-web components of South America rivers. In the Iguaçu River basin, the Astyanax genus is represented mainly by endemic species. For millions of years, that hydrographic basin has been geographically isolated from the Paraná River basin by the Iguaçu Falls. Recently, a species from the Upper Paraná River basin identified as Astyanax bimaculatus was revised and described as a new species named Astyanax altiparanae Garutti & Britski, 2000. Fauna endemism and geographic isolation triggered interest in investigations to evaluate the identification and genetic relatedness among two A. altiparanae populations from the Upper Paraná River basin and the population identified as A. bimaculatus in the Iguaçu River, upstream from the Iguaçu Falls. Mitochondrial DNA sequences and RAPD markers revealed high genetic diversity within each population, as well as low genetic distance, high gene flow, and high mitochondrial DNA similarity among all three populations. In conjunction with morphological similarities, these results demonstrated that the population presently known as Astyanax bimaculatus in the Iguaçu River should actually be stated as Astyanax altiparanae. Furthermore, it could be inferred that the A. altiparanae population is not endemic and most likely it was recently introduced in the Iguaçu River basin, maintaining the ancestral genetic identity.

  16. Cytogenetic analysis of three sea catfish species (Teleostei, Siluriformes, Ariidae) with the first report of Ag-NOR in this fish family

    Science.gov (United States)

    2010-01-01

    Despite their ecological and economical importance, fishes of the family Ariidae are still genetically and cytogenetically poorly studied. Among the 133 known species of ariids, only eight have been karyotyped. Cytogenetic analyses performed on Genidens barbus and Sciades herzbergii revealed that both species have 2n = 56 chromosomes and Cathorops aff. mapale has 2n = 52 chromosomes: Genidens barbus has 10 Metacentrics (M), 14 Submetacentrics (SM), 26 Subtelocentrics (ST), and 6 Acrocentrics (A), Sciades herzbergii has 14M, 20SM, 18ST and 4A, whereas Cathorops aff. mapale has 14M, 20SM, and 18ST. The nucleolus organizer regions (NORs) were found in a single chromosome pair on the short arm of a large-sized ST pair in Genidens barbus and on the short arm of a middle-size SM pair in Cathorops aff. mapale. Multiple NORs on the short arms of two large-sized ST pairs were found in Sciades herzbergii. The occurrence of diploid numbers ranging from 2n = 52 through 56 chromosomes and the presence of different karyotypic compositions, besides the number and position of NORs suggest that several numeric and structural chromosome rearrangements were fixed during the evolutionary history of this fish family. PMID:21637480

  17. Revision of Hastatobythites and Saccogaster (Teleostei, Bythitidae) with three new species and a new genus

    DEFF Research Database (Denmark)

    Nielsen, Jørgen; Schwarzhans, Werner; Cohen, Daniel M.

    2012-01-01

    Material of three similar and probably related genera of the viviparous ophidiiform family, Bythitidae, has been studied. The monotypic Hastatobythites is only known from the original two specimens; re-examination of the paratype and information of the holotype clearly demonstrates the validity o...... rakers, size of gill opening, thickness of skin, head pores, otolith morphology, color marks on head, neuromasts on head and head morphometrics, fin ray counts....

  18. Population structure and reproduction of Deuterodon langei travassos, 1957 (Teleostei, Characidae in a neotropical stream basin from the Atlantic Forest, Southern Brazil

    Directory of Open Access Journals (Sweden)

    Jean Ricardo Simões Vitule

    2008-12-01

    Full Text Available Aspects of the biology of D. langei were studied at different sites along a longitudinal gradient formed by the Ribeirão stream basin, a Neotropical stream of the Atlantic Forest, southern Brazil. Differences were observed in population structure and reproduction along the longitudinal gradient and during the study period. Juvenile fishes occurred in high abundance, mainly in the downstream site after the rainy months. Adults occurred mainly in the intermediate and upstream sites. During their life cycle, adults optimise their reproductive strategy by concentrating the reproductive period with total spawn in a short time interval before summer rains dragged the juvenile, larval forms and/or eggs downstream. The downstream site was characterized by a wide range of microhabitats (ex. submerged grass and shallow flooded area. Thus, the species used different portions of the basin in distinct stages of its life, being ecologically adapted to variation patterns in its temporal and physical environments.Aspectos da biologia de D. langei foram estudados em diferentes locais da bacia do rio Ribeirão, um riacho litorâneo da Floresta Atlântica do sudeste do Brasil. Foram observadas diferenças na estrutura da população e na reprodução, ao longo do gradiente longitudinal da bacia e do período de estudo. Os peixes juvenis ocorreram em grande abundância, principalmente no trecho a jusante da bacia, após os meses mais chuvosos. Adultos ocorreram principalmente nos trechos intermediários e a montante. Não houve diferença significativa na relação sexual entre os locais amostrados, estações do ano, meses e classes de comprimento. O comprimento médio de primeira maturação (L50 foi o mesmo para machos e fêmeas, entre 6,1 e 7,0 cm de comprimento total (Lt. O período reprodutivo foi curto (entre o final da primavera e início do verão, antes dos meses mais chuvosos, com desova total. O Índice de Atividade Reprodutiva (IAR indicou que D. langei reproduz em toda a bacia, porém a atividade reprodutiva é mais intensa nos trechos mais a montante da bacia. O período chuvoso e as chuvas torrenciais se mostraram fatores abióticos muito importantes para a dinâmica da população. Durante seu ciclo de vida os adultos maximizam sua estratégia reprodutiva concentrando o período reprodutivo, com desova total em um curto espaço de tempo antes das chuvas de verão que carregam juvenis, formas larvais e/ou ovos para as regiões a jusante onde existe uma ampla quantidade de micro-ambientes (gramíneas submersas e áreas rasas e calmas. Desta forma a espécie estudada utilizou diferentes porções da bacia em distintos estágios de seu ciclo de vida, demonstrando estar ecologicamente adaptada às variações temporais e físicas do ambiente.

  19. Gill histopathology and micronucleus test of Astyanax jacuhiensis (Cope, 1894 (Teleostei, Characidae to evaluate effects caused by acute exposure to aluminum

    Directory of Open Access Journals (Sweden)

    Thaís Dalzochio

    2016-02-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2016v29n1p75 The contamination of aquatic environments by aluminum (Al is usually caused by several anthropogenic activities. Diverse morphological, physiological and biochemical alterations in aquatic organisms have been attributed to exposure to Al. In this context, the aim of this study was to investigate the effects of acute exposure to different concentrations of Al on the histology of gills and frequency of micronucleus (MN and nuclear abnormalities (NA in erythrocytes of the fish Astyanax jacuhiensis. Fish were exposed to sublethal concentrations of 0.3 mg/L and 30 mg/L of aluminum at neutral pH for 72 h. A control group was kept in filtrated water. The alterations in the gills were characterized by epithelial hyperplasia and hypertrophy, lamellar fusion, edema, epithelial lifting, aneurism and necrosis. A significant increase (p<0.05 in the frequency of abnormal lamellae was observed in groups exposed to both concentrations of Al in comparison with the control group. On the other hand, no statistical differences were observed in the frequencies of MN and NA. Although no evidence of genotoxicity was observed, the results found in the gill morphological analysis suggest that Al was toxic to the fish at both concentrations tested under neutral pH.

  20. Gonadal Morphogenesis and Sex Differentiation in Intraovarian Embryos of the Viviparous Fish Zoarces viviparus (Teleostei, Perciformes, Zoarcidae): A Histological and Ultrastructural Study

    DEFF Research Database (Denmark)

    Rasmussen, Tina H.; Jespersen, Åse; Korsgaard, Bodil

    2006-01-01

    of the male embryos, the germ cells (spermatogonia), in contrast to the germ cells of the ovary, remain quiescent and do not enter meiosis during intraovarian development. However, other structural (somatic) changes, such as the initial formation of the sperm duct (30 dph), the presence of blood vessels...

  1. The ecology of the riverine Garra species (Teleostei, Cypriniformes) in reservoirs of the semi-arid highlands of northern Ethiopia: temporal dynamics of feeding activity

    NARCIS (Netherlands)

    Teferi, M.; Declerck, S.A.J.; De Bie, T.; Gebrekidan, A.; Snoeks, J.; Asmelash, T.; Dejenie, T.; Bauer, H.; Deckers, J.A.; De Meester, L.

    2013-01-01

    Garra species are among the most abundant fish in small rivers of northern Ethiopia. Many manmade reservoirs in the region have been colonized by Garra, which often are the only fish species present and have become very abundant. Little is known about the ecology of these reservoir populations of

  2. Salinity tolerance of non-native Asian swamp eels (Teleostei: Synbranchidae) in Florida, USA: Comparison of three populations and implications for dispersal

    Science.gov (United States)

    Schofield, P.J.; Nico, L.G.

    2009-01-01

    Three populations of non-native Asian swamp eels are established in peninsular Florida (USA), and comprise two different genetic lineages. To assess potential for these fish to penetrate estuarine habitats or use coastal waters as dispersal routes, we determined their salinity tolerances. Swamp eels from the three Florida populations were tested by gradual (chronic) salinity increases; additionally, individuals from the Miami population were tested by abrupt (acute) salinity increases. Results showed significant tolerance by all populations to mesohaline waters: Mean survival time at 14 ppt was 63 days. The Homestead population, a genetically distinct lineage, exhibited greater tolerance to higher salinity than Tampa and Miami populations. Acute experiments indicated that swamp eels were capable of tolerating abrupt shifts from 0 to 16 ppt, with little mortality over 10 days. The broad salinity tolerance demonstrated by these experiments provides evidence that swamp eels are physiologically capable of infiltrating estuarine environments and using coastal waters to invade new freshwater systems. ?? 2009 US Government.

  3. Aspects of the biology of the Atlantic Midshipman, Porichthys porosissimus (Teleostei, Batrachoididae: an important by-catch species of shrimp trawling off southern Brazil

    Directory of Open Access Journals (Sweden)

    Marcelo Vianna

    2000-01-01

    Full Text Available Trawl fishing for pink shrimp (Farfantepenaeus brasiliensis and F. paulensis catches large quantities of by-catch fish, discarded due to their having no commercial vaue. As these species have rarely been studied, the impact of fisheries on these populations is not known. This contribution studies the biology of a species of no commercial value, the Atlantic midshipman Porichthys porosissimus. The last haul /Tom a commercial trawler, operating on the northern coast of São Paulo State and the southern coast of Rio de Janeiro State, was preserved (/Tom being discarded and identified at the species leveI. It was observed that this fishery affects the juvenile population which is intluenced by the seasonal variation of the water masses. Growth parameters were estimated: L∞ = 37.0 cm, K = 0.285 year-1. Instantaneous mortality coefficients were estimated: 2=2.14, M=0.63, F= 1.51, S= 11.8 and E=0.71. Considering the intensive activity of the shrimp trawl tleet operating in this area, the deleterious action of trawling is considered as of high impact. The stock management measures applied for pink shrimp are without effect regarding P. porosissimus. which has its spawning period before the closed season and its recruitment peak after it. The results show overfishing and the need to apply measures to reduce trawling action, such as adequate policies, introduction of selectivity devices and the creation of exclusion zones for trawl fishing.A pesca de arrasto para a captura do camarão-rosa (Fm:fantepenaeus brasi/iensis e F. paulensis captura grande quantidade de peixes considerados fauna acompanhante que são descartados por não possuírem valor comercial. Assim, pouco aparecem em trabalhos de biologia pesqueira com dados de desembarque, sendo a ação pesqueira sobre estas populações pouco conhecida. Neste estudo, um arrasto mensal de um barco de pesca foi desembarcado sem que nada do material capturado fosse descartado. Analisou-se Porichthys porosissimus do qual foram avaliados aspectos biológicos e pesqueiros. Estimou-se, para a espécie: L∞ = 37,0 cm, K = 0,285 ano.l, Rn=180 (x 10-3, 2=2,14, M=0,63, F=1,51, S=11,8 e E=0.71. Embora não intencional, a pesca age principalmente em jovens e ocorre durante o ano todo, sendo intluenciada pela sazonal idade das massas d'água. Considerando a frota operante na área, o efeito do arrasto é considerável, já que a taxa de aproveitamento é nula. As medidas de proteção de estoque aplicadas ao camarão-rosa não são efetivas para P. porosissimus, que apresenta o período de desova anterior à época do defeso e o pico de recrutamento pesqueiro posterior. Os resultados indicam sobrepesca da população estudada sendo necessário medidas de modo a diminuir a ação deletéria do arrasto, como a adequação da legislação, uso de dispositivos de seletividade e a criação de zonas de exclusão de arrasto.

  4. New species of Eugerres from the Usumacinta Province, México and Guatemala with a redescription of E. mexicanus (Steindachner, 1863 (Teleostei: Gerreidae

    Directory of Open Access Journals (Sweden)

    Adrian F. Gonzalez-Acosta

    Full Text Available Eugerres castroaguirrei, new species is described from the río Grijalva-Usumacinta basin of southeastern Mexico and northern Guatemala. Eugerres castroaguirrei and E. mexicanus are distinguishable from their marine estuarine congeners by the dorsal-fin origin posterior to the insertion of the pectoral and pelvic fins, a shorter and broad based supraoccipital crest, and a distinct geographic distribution restricted to freshwater habitats. Eugerres castroaguirrei differs from E. mexicanus by diagnostic characters of the body skeleton: anterior process of supraoccipital convex, infraorbital 1 with foramen, premaxillary ascending process developed with margins curved, pharyngeal plate granular and not serially arranged, and dorsal and anal fin-rays reduced. Likewise, E. castroaguirrei is characterized by an oblong and laterally thicker body (37.6-58.5% HL; greater body depth (33.8-42.1% SL, and eye diameter (23.3-31.6% HL; in addition to 16 significant morphometric characters: length of the second dorsal-fin spine 23.2-34.2% SL; depressed second dorsal-fin spine (extending to base of third to fourth dorsal-fin rays; length of second anal-fin spine 11.1-20.6% SL, depressed second anal-fin spine extending to the base of third to fourth anal-fin rays not reaching the distal point of last anal-fin ray; pelvic-fin spine length 49.7-65.0% in the first pelvic-fin ray length

  5. Diversidade de dietas na assembléia de linguados (Teleostei, Pleuronectiformes do manguezal da Baía de Guaratuba, Paraná, Brasil

    Directory of Open Access Journals (Sweden)

    Paulo de Tarso da C. Chaves

    1998-01-01

    Full Text Available Citharichthys arenaceus e C. spilopterus são responsáveis por cerca de 70% da abundância de linguados no manguezal da Baía de Guaratuba. Nesta assembléia, da qual também fazem parte Symphurus tessellatus, Etropus crossotus e Achirus lineatus, a dieta baseia-se em crustáceos, peixes, Gastropoda e Polychaeta. Seu hábito alimentar não é altamente especializado, mas algumas particularidades são observadas: em Citharichthys spp e S. tessellatus, Caridea e peixes são os principais itens ingeridos; em E. crossotus, Amphipoda Gammaridae; e em A. lineatus, Polychaeta. As espécies cuja dieta está em maior grau sobreposta com outras são também aquelas cujo hábito é mais generalista. Em tais casos, a natureza dos itens complementares confere identidade própria a cada dieta, atenuando uma eventual competição interespecífica. Os resultados da associação entre a abundância das populações e o grau de participação dos itens na dieta de cada uma reforçam esta conclusão.Citharichthys arenaceus and C. spilopterus form together almost 70% of the flatfishes abundance in the mangrove of the Guaratuba Bay. The other important Pleuronectiformes species are Symphurus tessellatus, Etropus crossotus and Achirus lineatus. The main food items of this assemblage are composed by crustacea, fishes, Gastropoda and Polychaeta. None of these species was found to have a highly specialized diet, but they present some particularities: Citharichthys spp and S. tessellatus have a diet based on Caridea and fish, E. crossotus based on Amphipoda Gammaridae, and A. lineatus based on Polychaeta. The partially overlapping habits correspond to the most generalized diets, so any interspecific competition would be reduced by the nature of the complementary food items. Additiortal support for this hypothesis is provided by the results conceming both the species density and the percent occurrence of the prey categories.

  6. Parallel body shape divergence in the Neotropical fish genus Rhoadsia (Teleostei: Characidae) along elevational gradients of the western slopes of the Ecuadorian Andes

    Science.gov (United States)

    Malato, Grace; Shervette, Virginia R.; Navarrete Amaya, Ronald; Valdiviezo Rivera, Jonathan; Nugra Salazar, Fredy; Calle Delgado, Paola; Karpan, Kirby C.

    2017-01-01

    Neotropical mountain streams are important contributors of biological diversity. Two species of the characid genus Rhoadsia differing for an ecologically important morphological trait, body depth, have been described from mountain streams of the western slopes of the Andes in Ecuador. Rhoadsia altipinna is a deeper-bodied species reported from low elevations in southwestern Ecuador and northern Peru, and Rhoadsia minor is a more streamlined species that was described from high elevations (>1200 m) in the Esmeraldas drainage in northwestern Ecuador. Little is known about these species and their validity as distinct species has been questioned. In this study, we examine how their body shape varies along replicated elevational gradients in different drainages of western Ecuador using geometric morphometrics and the fineness ratio. We also use sequences of the mitochondrial cytochrome oxidase c I gene and the second intron of the S7 nuclear gene to examine whether genetic data are consistent with the existence of two species. We found that body depth varies continuously among populations within drainages as a function of elevation, and that body shape overlaps among drainages, such that low elevation populations of R. minor in the Esmeraldas drainage have similar body depths to higher elevation R. altipinna in southern drainages. Although a common general trend of declining body depth with elevation is clear, the pattern and magnitude of body shape divergence differed among drainages. Sequencing of mitochondrial and nuclear genes failed to meet strict criteria for the recognition of two species (e.g., reciprocal monophyly and deep genetic structure). However, there was a large component of genetic variation for the COI gene that segregated among drainages, indicating significant genetic divergence associated with geographic isolation. Continued research on Rhoadsia in western Ecuador may yield significant insight into adaptation and speciation in Neotropical mountain streams. PMID:28658255

  7. Testing the enemy release hypothesis: abundance and distribution patterns of helminth communities in grey mullets (Teleostei: Mugilidae) reveal the success of invasive species.

    Science.gov (United States)

    Sarabeev, Volodimir; Balbuena, Juan Antonio; Morand, Serge

    2017-09-01

    The abundance and aggregation patterns of helminth communities of two grey mullet hosts, Liza haematocheilus and Mugil cephalus, were studied across 14 localities in Atlantic and Pacific marine areas. The analysis matched parasite communities of (i) L. haematocheilus across its native and introduced populations (Sea of Japan and Sea of Azov, respectively) and (ii) the introduced population of L. haematocheilus with native populations of M. cephalus (Mediterranean, Azov-Black and Japan Seas). The total mean abundance (TMA), as a feature of the infection level in helminth communities, and slope b of the Taylor's power law, as a measure of parasite aggregation at the infra and component-community levels, were estimated and compared between host species and localities using ANOVA. The TMA of the whole helminth community in the introduced population of L. haematocheilus was over 15 times lower than that of the native population, but the difference was less pronounced for carried (monogeneans) than for acquired (adult and larval digeneans) parasite communities. Similar to the abundance pattern, the species distribution in communities from the invasive population of L. haematocheilus was less aggregated than from its native population for endoparasitic helminths, including adult and larval digeneans, while monogeneans showed a similar pattern of distribution in the compared populations of L. haematocheilus. The aggregation level of the whole helminth community, endoparasitic helminths, adult and larval digeneans was lower in the invasive host species in comparison with native ones as shown by differences in the slope b. An important theoretical implication from this study is that the pattern of parasite aggregation may explain the success of invasive species in ecosystems. Because the effects of parasites on host mortality are likely dose-dependent, the proportion of susceptible host individuals in invasive species is expected to be lower, as the helminth distribution in the invasive host was featured by a higher number of uninfected hosts and a shorter distribution tail when compared with native species. Copyright © 2017 Australian Society for Parasitology. Published by Elsevier Ltd. All rights reserved.

  8. Morphometric or morpho-anatomal and genetic investigations highlight allopatric speciation in Western Mediterranean lagoons within the Atherina lagunae species (Teleostei, Atherinidae)

    Science.gov (United States)

    Trabelsi, M.; Maamouri, F.; Quignard, J.-P.; Boussaïd, M.; Faure, E.

    2004-12-01

    Current distribution of Atherina lagunae poses an interesting biogeographical problem as this species inhabits widely separate circum-Mediterranean lagoons. Statistical analyses of 87 biometric parameters and genetic variation in a portion of the cytochrome b gene were examined in four populations of A. lagunae from Tunisian and French lagoons. The results suggested a subdivision into two distinct Atherinid groups: one included the French lagoonal sand smelts and the second included the Tunisian ones. Tunisian lagoonal sand smelts were distinguished from the French ones by the lower number of lateral line scales, vertebrae, pectorals and first dorsal fin rays and the higher number of lower and total gillrakers. In addition, A. lagunae from Tunisian lagoons are characterised by short preorbital length, developed operculum, broad interorbital space, larger head, robust body and a relatively small first dorsal fin which is positioned backwards. In addition, intraspecific sequence variation in a portion of the cytochrome b gene was examined in 87 individuals from Tunisia and France. The high correlation between the results of the molecular phylogenetic tree and biometric statistical data analysis suggested that two different sibling species or at least sub-species or semi-species have colonised the lagoons. In addition, our analyses suggested that the evolution of A. lagunae probably occurred in two steps including marine sympatric speciation within the large Atherina boyeri complex and a post-Pleistocene colonisation of the lagoons.

  9. Growth of the dusky grouper Epinephelus marginatus (Linnnaeus, 1758 (Teleostei, Serranidae, in the Natural Marine Reserve of Lavezzi Islands, Corsica, France

    Directory of Open Access Journals (Sweden)

    J. L. Bouchereau

    1999-03-01

    Full Text Available The growth of Epinephelus marginatus living in the Natural Marine Reserve of the Lavezzi Islands was studied using the von Bertalanffy model. The growth parameters of this model were: L?=135.9 cm, K=0.08, t0=-0.80 years. The relationship between length and weight was W=12.5 10-2 TL2.60. Grouper lengths were similar in the Lavezzi Islands and in North Tunisia. The relative abundance of trophic resources in the Lavezzi Islands, due to a positive reserve effect and enhanced by a small population density of groupers, has great consequences on growth, compensating the effect of lower water temperature. A plausible explanation for the similarity between these two populations is that they belong to a single metapopulation.

  10. Population Structure, Genetic Diversity, Effective Population Size, Demographic History and Regional Connectivity Patterns of the Endangered Dusky Grouper, Epinephelus marginatus (Teleostei: Serranidae, within Malta's Fisheries Management Zone.

    Directory of Open Access Journals (Sweden)

    Molly Buchholz-Sørensen

    Full Text Available The objective of this study is to describe the genetic population structure and demographic history of the endangered marine fish, Epinephelus marginatus, within Malta's Fisheries Management Zone for the purpose of localised conservation planning. Epinephelus marginatus is a long-lived, sedentary, reef-associated protogynous hermaphrodite with high commercial and recreational value that is at risk of extinction throughout its global distribution. Based on global trends, population substructuring and gaps in local knowledge this has led to an increased interest in evaluation of local stock. Assessment of Maltese demography was based on historical and contemporary catch landings data whilst genetic population structure and regional connectivity patterns were evaluated by examining 175 individuals collected within the central Mediterranean region between 2002 and 2009 using 14 nuclear microsatellite loci. Demographic stock assessment of Maltese E. marginatus' revealed a 99% decline in catch landings between 1947 and 2009 within the Fisheries Management Zone. A contemporary modest mean size was observed, 3 ± 3 kg, where approximately 17% of the population was juvenile, 68% female/sex-changing and 15% were male with a male-to-female sex ratio of 1:5. Genetic analysis describes the overall population of E. marginatus' within the Fisheries Management Zone as decreasing in size (ƟH = 2.2, which has gone through a significant size reduction in the past (M = 0.41 and consequently shows signs of moderate inbreeding (FIS = 0.10, p < 0.001 with an estimated effective population size of 130 individuals. Results of spatially explicit Bayesian genetic cluster analysis detected two geographically distinct subpopulations within Malta's Fisheries Management Zone and that they are connected to a larger network of E. marginatus' within the Sicily Channel. Results suggest conservation management should be designed to reflect E. marginatus' within Malta's Fisheries Management Zone as two management units.

  11. Involvement of pituitary gonadotropins, gonadal steroids and breeding season in sex change of protogynous dusky grouper, Epinephelus marginatus (Teleostei: Serranidae), induced by a non-steroidal aromatase inhibitor.

    Science.gov (United States)

    Garcia, Carlos Eduardo de O; Araújo, Bruno C; Mello, Paulo H; Narcizo, Amanda de M; Rodrigues-Filho, Jandyr A; Medrado, Andreone T; Zampieri, Ricardo A; Floeter-Winter, Lucile M; Moreira, Renata Guimarães

    2013-10-01

    Two experiments were performed using the aromatase inhibitor (AI) letrozole (100mg/kg) to promote sex change, from female-to-male, in protogynous dusky grouper. One experiment was performed during the breeding season (spring) and the other at the end of the breeding season (summer). During the spring, AI promoted sex change after 9 weeks and the sperm produced was able to fertilize grouper oocytes. During the summer, the sex change was incomplete; intersex individuals were present and sperm was not released by any of the animals. Sex changed gonads had a lamellar architecture; cysts of spermatocytes and spermatozoa in the lumen of the germinal compartment. In the spring, after 4 weeks, 11ketotestosterone (11KT) levels were higher in the AI than in control fish, and after 9 weeks, coincident with semen release, testosterone levels increased in the AI group, while 11KT returned to the initial levels. Estradiol (E2) levels remained unchanged during the experimental period. Instead of decreasing throughout the period, as in control group, 17 α-OH progesterone levels did not change in the AI-treated fish, resulting in higher values after 9 weeks when compared with control fish. fshβ and lhβ gene expression in the AI animals were lower compared with control fish after 9 weeks. The use of AI was effective to obtain functional males during the breeding season. The increase in androgens, modulated by gonadotropins, triggered the sex change, enabling the development of male germ cells, whereas a decrease in E2 levels was not required to change sex in dusky grouper. Copyright © 2013 Elsevier Inc. All rights reserved.

  12. Comparison of the bioaccumulation from seawater and depuration of heavy metals and radionuclides in the spotted dogfish Scyliorhinus canicula (Chondrichthys) and the turbot Psetta maxima (Actinopterygii: Teleostei)

    Energy Technology Data Exchange (ETDEWEB)

    Jeffree, Ross A.; Warnau, Michel; Teyssie, Jean-Louis [IAEA Marine Environment Laboratory, 4 Quai Antoine 1er, MC 98000 (Monaco); Markich, Scott J. [Aquatic Solutions International, Level 1, 467 Miller St, Cammeray, NSW 2062 (Australia)

    2006-09-15

    The bioaccumulation of selected heavy metals and radionuclides ({sup 241}Am, {sup 109}Cd, {sup 57}Co, {sup 51}Cr, {sup 134}Cs, {sup 54}Mn and {sup 65}Zn) from seawater was experimentally compared in the Chondrichthyan Scyliorhinus canicula (spotted dogfish) and the Actinopterygian Teleost Psetta maxima (turbot), of comparable size, age and benthic feeding habits. The speciation of these elements in seawater (salinity 38%%, pH 8.1, temperature 16.5 {sup o}C) was also calculated to determine their potential bioavailability. The uptake rates, measured over 14 days, varied greatly among isotopes and between species. Concentration factors (CFs) in P. maxima varied 5-fold between ca. 0.2 for {sup 51}Cr and 2.5 for {sup 65}Zn and {sup 134}Cs, whereas in S. canicula they varied by a much greater factor of 350, with CFs for {sup 51}Cr and {sup 241}Am ranging from ca. 0.4 to 140, respectively. With the exception of {sup 134}Cs, all radiotracers were accumulated at a faster rate in S. canicula than in P. maxima, particularly for {sup 241}Am and {sup 65}Zn where the CFs attained during the uptake phase were, two and one order of magnitude greater in S. canicula, respectively. In contrast, {sup 134}Cs reached a CF of about 2.5 in P. maxima, which was 5-fold greater than in S. canicula. Patterns of loss from the experimental depuration phase over 29 days showed greater similarities between species, compared to the uptake phase that highlighted the greater differences between elements. The distributions of these seven radioisotopes among six body components indicated that between the two species the skin of the dogfish displayed a greater bioaccumulation potential, particularly for {sup 241}Am, {sup 57}Co and {sup 65}Zn. However {sup 65}Zn was also distinctive from {sup 241}Am and {sup 57}Co in its pattern of bioaccumulation in dogfish, with its other body components attaining concentrations of {sup 65}Zn that were comparable to the levels found in its skin. The heightened uptake of {sup 134}Cs in turbot was characterised by a more even percentage distribution among its tissues compared to {sup 241}Am and {sup 57}Co, but every tissue of turbot had a higher concentration of {sup 134}Cs, compared to dogfish, particularly the muscle and liver. The elevated uptake rates and higher CFs for most radioisotopes indicate that S. canicula is more susceptible than P. maxima to exposure and contamination by these metals and radionuclides in seawater. These experimentally-determined differences between dogfish and turbot in their bioaccumulation characteristics were assessed against a set of criteria erected to evaluate the working hypothesis that they were taxonomically based. The outcomes of this initial assessment were supportive of this hypothesis that warrants further investigation. (author)

  13. Genetic heterogeneity reveals on-going speciation and cryptic taxonomic diversity of stream-dwelling gudgeons (Teleostei, Cyprinidae in the middle Danubian hydrosystem (Hungary.

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    Péter Takács

    Full Text Available Although stream-dwelling gudgeons (Cyprinidae, genus: Gobio are widespread in Central Europe, the taxonomy of this group and the distribution of its species are still unexplored in detail. The aims of our study are to ascertain taxonomic composition and distribution of the former Gobio gobio superspecies in the inner area of the Carpathian Basin. Since the presence of cryptic species is suspected in this area, we examined the taxonomic and phylogenetic relationships of Central European Gobio taxa by sequencing the mitochondrial DNA control region (mtCR. Additionally, we characterized the genetic structure of 27 stream-dwelling gudgeon populations of this area by Amplified Fragment Length Polymorphism (AFLP. Results of mtCR analysis proved the presence of three species already known as G. obtusirostris (dominant in NW-Hungary, G. gobio (sporadic and G. carpathicus (sporadic. Additionally, the analysis revealed the existence of one doubtful taxon, G. sp1 (dominant in NE-Hungary, and a new isolated haplogroup (dominant in SW-Hungary. Although Network analysis showed significant detachment among haplogroups, their genetic distances were quite small. Therefore Bayesian phylogenetic analysis showed weak nodal support for the branching pattern both for newly described haplotypes, and for the already accepted species. AFLP data showed distinct population structure and a clear pattern of isolation was revealed by distance of stocks. At the same time, level of separation was not affected by the altitudinal position of sites. Moreover we found three major clusters of populations which were separated according to hydrographic regions, and corresponded to the findings of mtCR analysis. Our results suggest the on-going speciation of gudgeons in the Carpathian Basin, however the separation of haplogroups seems to only be an intermediate phase. The discovered natural pattern seems to be only slightly influenced by anthropogenic impacts. Additionally our results put into question the suitability of the recently accepted within Gobio genus taxonomy.

  14. Use of food resources and resource partitioning among five syntopic species of Hypostomus (Teleostei: Loricariidae in an Atlantic Forest river in southern Brazil

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    Vinicius Abilhoa

    Full Text Available ABSTRACT We analyzed the diet and resource partitioning among five syntopic species of Hypostomus Lacépède, 1803 in the Corumbataí River in southeastern Brazil. The gut contents of 352 individuals were assessed and 21 food items were identified and quantified under an optical microscope. The food items found in the gut contents indicate that these suckermouth loricariids are bottom-dwelling detritivorous/periphytivorous catfishes. PERMANOVA and SIMPER analyses indicated variation in the consumption of some resources, and the contribution of periphytic algae was primarily responsible for such dissimilarity. ECOSIM analyses of dietary overlap showed evidence of resource sharing among all species in the dry and rainy periods. This is most likely the result of the predominance of detritus and autochthonous items such as algae and aquatic immature insects in all gut contents. Our data suggest that trophic resources available in the Corumbataí River are explored and partitioned among Hypostomus species, all specialized in surface-grazing foraging behaviour.

  15. Dynamics and cytochemistry of oogenesis in Leporinus striatus Kner (Teleostei, Characiformes, Anostomidae from the Rio Sapucaí, Minas Gerais State, Brazil

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    Helena A.S. Chini

    2001-12-01

    Full Text Available Oogenesis involves a sequense of transformations which are undergone by female germ cells. These cells change into oogonias and then into mature oocytes. Sexually mature females were collected monthly, during one year, from the Rio Sapucaí, tributary of the Rio Grande, which is part of the Furnas Reservoir system in the state of Minas Gerais. The observed material showed that oogonias were small spherical cells, had a big spherical nucleus, with a single nucleolus, and weakly stained cytoplasm with eosinophilic granules (FG stained, which indicate their protein content. The primary oocytes showed a big basophilic nucleus, with a large peripheral nucleolus, and several smaller nucleoli. They show a reduced cytoplasmic content. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent vitellogenesis with the development of the zona radiata and the follicle cells. The zona radiata had two layers, the outer and the inner, which showed its protein content when stained with CM and FG techniques. TB pH 2.5 and pH 4.0 staining showed that oocytes undergoing vitellogenesis presented weakly stained cytoplasm and peripheral cytoplasmic vesicles. The follicle cells that were squamous became cuboidal. In mature oocytes, the yolk granules that filled the cytoplasm became green and blue when stained with FG and CM techniques, indicating their protein content. The perivitclline region showed rosy stained vesicles (TB pH 2.5 and pH 4.0 spread among the weakly stained peripheral vesicles, which seemed to be the cortical alveoli. The zona radiata cells, CM and FG stained, still showed two layers like the oocytes from the previous stage, but thicker.

  16. Effects of climatic and geological processes during the pleistocene on the evolutionary history of the northern cavefish, Amblyopsis spelaea (teleostei: amblyopsidae).

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    Niemiller, Matthew L; McCandless, James R; Reynolds, R Graham; Caddle, James; Near, Thomas J; Tillquist, Christopher R; Pearson, William D; Fitzpatrick, Benjamin M

    2013-04-01

    Climatic and geological processes associated with glaciation cycles during the Pleistocene have been implicated in influencing patterns of genetic variation and promoting speciation of temperate flora and fauna. However, determining the factors promoting divergence and speciation is often difficult in many groups because of our limited understanding of potential vicariant barriers and connectivity between populations. Pleistocene glacial cycles are thought to have significantly influenced the distribution and diversity of subterranean invertebrates; however, impacts on subterranean aquatic vertebrates are less clear. We employed several hypothesis-driven approaches to assess the impacts of Pleistocene climatic and geological changes on the Northern Cavefish, Amblyopsis spelaea, whose current distribution occurs near the southern extent of glacial advances in North America. Our results show that the modern Ohio River has been a significant barrier to dispersal and is correlated with patterns of genetic divergence. We infer that populations were isolated in two refugia located north and south of the Ohio River during the most recent two glacial cycles with evidence of demographic expansion in the northern isolate. Finally, we conclude that climatic and geological processes have resulted in the formation of cryptic forms and advocate recognition of two distinct phylogenetic lineages currently recognized as A. spelaea. © 2012 The Author(s). Evolution© 2012 The Society for the Study of Evolution.

  17. Population Structure, Genetic Diversity, Effective Population Size, Demographic History and Regional Connectivity Patterns of the Endangered Dusky Grouper, Epinephelus marginatus (Teleostei: Serranidae), within Malta's Fisheries Management Zone.

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    Buchholz-Sørensen, Molly; Vella, Adriana

    2016-01-01

    The objective of this study is to describe the genetic population structure and demographic history of the endangered marine fish, Epinephelus marginatus, within Malta's Fisheries Management Zone for the purpose of localised conservation planning. Epinephelus marginatus is a long-lived, sedentary, reef-associated protogynous hermaphrodite with high commercial and recreational value that is at risk of extinction throughout its global distribution. Based on global trends, population substructuring and gaps in local knowledge this has led to an increased interest in evaluation of local stock. Assessment of Maltese demography was based on historical and contemporary catch landings data whilst genetic population structure and regional connectivity patterns were evaluated by examining 175 individuals collected within the central Mediterranean region between 2002 and 2009 using 14 nuclear microsatellite loci. Demographic stock assessment of Maltese E. marginatus' revealed a 99% decline in catch landings between 1947 and 2009 within the Fisheries Management Zone. A contemporary modest mean size was observed, 3 ± 3 kg, where approximately 17% of the population was juvenile, 68% female/sex-changing and 15% were male with a male-to-female sex ratio of 1:5. Genetic analysis describes the overall population of E. marginatus' within the Fisheries Management Zone as decreasing in size (ƟH = 2.2), which has gone through a significant size reduction in the past (M = 0.41) and consequently shows signs of moderate inbreeding (FIS = 0.10, p Fisheries Management Zone and that they are connected to a larger network of E. marginatus' within the Sicily Channel. Results suggest conservation management should be designed to reflect E. marginatus' within Malta's Fisheries Management Zone as two management units.

  18. Small scale distribution patterns and vertical migration of North Sea herring larvae (Clupea harengus, Teleostei: Clupeidea in relation to abiotic and biotic factors

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    Holger Haslob

    2009-10-01

    Full Text Available The distribution of herring larvae in relation to environmental conditions and the occurrence of possible prey and predator organisms was studied during a 4-day period on a permanent station in the northern North Sea in September 1999. The vertical distribution of herring larvae was sampled in 20-m intervals by means of a multiple-closing net. To resolve the small-scale patchiness of herring larvae and planktonic prey and predator organisms, a towed in-situ video system was used, the Ichthyoplankton Recorder. A diel vertical migration of herring larvae was observed with different intensities depending on their body length. Small larvae ( 16 mm showed the highest abundances in the upper water layers during the day and were concentrated in deeper water layers during the night. The presented results appear to be relevant for individual-based modelling of the fate of larval herring populations.

  19. Biologia reprodutiva de Micropogonias furnieri (Desmarest, 1823 (Teleostei, Sciaenidae: 2. Relação gonadossomática, comprimento e peso dos ovários como indicadores do período de desova Reproductive bilogy of Micropogonias funieri (Desmaret 1823 (Teleostei, Scinidae: 2. Gonadosomatic index, legth and weight of ovaries as indicator of spawning season

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    Victoria J Isaac-Nahum

    1987-01-01

    Full Text Available Analisaram-se as variações da relaçao gonadossomática (RGS, do comprimento e do peso médios dos ovários por estádio de maturidade e durante um ano, procurando-se estabelecer indicadores quantitativos do grau de desenvolvimento gonadal e dos períodos de desova da população I de Micropogonias funieri. Constatou-se que, para fêmeas num mesmo estádio de maturidade, nao ocorre dependência entre valores individuais de RGS e peso total, sendo a RGS constante para cada estádio, o que permite sua utilização como indicador do grau de desenvolvimento gonadal. Ocorreram variações cíclicas paralelas nos valores dos três indicadores, cujos valores modais coincidem com os períodos de desova (outono, inverno e primavera-verão, o que nos permite utiliza-los como indicadores desses períodos.Gonadosomatio index (RGS , mean ovaries length and weight variations has been analysed in order to verify if they may be used as quantitative indicators of spawning period and gonadal development in Micropogonias funieri, population I (23º-29ºS. The analysis of the relationships between gonadosomatio index and total weight single valuesy for females in the same maturity stage, didn't show dependence, being a constant value for each stage, which makes it useful as an a indicator of gonadal development. The three indices showed cyclic Variations with modal values corresponding to the three spawning periods (autumn, winter and spring-summer.

  20. Condicionantes ambientais na distribuição e no periodo reprodutivo do Orthopristis ruber (Cuvier (Teleostei, Haemulidae na Baía de Sepetiba, Rio de Janeiro, Brasil Environmental constraints on distribution and reproductive period of Orthopristis ruber (Cuvier (Teleostei, Haemulidae in the Sepetiba Bay, Rio de Janeiro, Brasil

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    André L. B. dos Santos

    2007-12-01

    Full Text Available Orthopristis ruber (Cuvier, 1830 é uma espécie muito comum na costa brasileira, sendo encontrada em baias, onde figura entre os mais abundantes peixes nos arrastos de fundo. Este trabalho tem por objetivo avaliar a influência das condicionantes ambientais na distribuição espaço-temporal e no período reprodutivo de O. ruber na Baía de Sepetiba, uma área costeira semi-fechada no sul do Rio de Janeiro. Foi realizado um programa de arrasto de fundo, entre outubro de 1998 e setembro de 1999, em três zonas da baía, estabelecidas de acordo com sua proximidade do mar (interna, central e externa. Amostras mensais de peixes foram tomadas em triplicatas em cada ocasião de amostragem, bem como foram medidas as variáveis ambientais de temperatura, salinidade, transparência e profundidade. Abundância relativa foi avaliada com base nas CPUEs (Captura por Unidade de Esforço em termos de número e de biomassa, enquanto o período reprodutivo foi determinado com o índice gonadossomático. Um total de 866 indivíduos foi capturado, com o tamanho variando entre 31 e 293 mm de comprimento total e proporção sexual de 1:1. Um maior número de peixes foi registrado em janeiro/fevereiro e em maio, embora não tenha sido encontrada diferença na abundancia relativa entre as estações do ano. Espacialmente, os maiores números e biomassas foram registrados na zona externa. Correlação positiva significativa foi encontrada entre a abundancia relativa e a profundidade, salinidade e transparência, e negativa com a temperatura. O período reprodutivo, indicado pelos maiores valores de índices gonadosomático (IGS, provavelmente ocorre de junho a setembro, coincidindo com as menores temperaturas. Esta espécie parece ter distribuição limitada às zonas mais externa da baia, próxima à influência com o mar, com maiores influxos no verão, como provável efeito da das Águas Centrais do Atlântico Sul (ACAS que comprimem as Águas Costeiras (AC para a baía.Orthopristis ruber (Cuvier, 1830 is a very common species in the Brazilian coast, being found in large abundance in bays where they rank among the most numerical abundant species in bottom trawls. This work aims to assess environmental influences on spatial, temporal distribution and reproductive period of O. ruber in the Sepetiba Bay, a coastal semi-closed area in the Rio de Janeiro State. Monthly samplings were carried out using otter trawl from October 1998 to September 1999, in three Bay zones, defined according to the proximity of the sea (inner, middle and outer. Samples were taken as triplicate at each site as well as environmental measurements of water temperature, salinity, transparency and depth. Relative abundance was assessed by CPUE (capture per unit effort in both number and weight. The reproductive period was determined by the gonadossomatic index. A total of 866 individuals was caught, with size ranging from 31 to 293 mm Total Length and sex ratio 1:1. Higher fish numbers and biomass were recorded in January/February and May, although no significant difference was found among seasons. Spatially, the highest number and biomass were recorded in the outer zone. Positive significant correlation between relative abundance and depth, salinity and transparency and negative with temperature were found. The reproductive period, indicated by the highest gonadosomatic index (IGS occurred probably between June and September, coinciding with the lowest temperatures. This species seems to have distribution limited to outer bay zones, near to the sea influence, with the highest influxes in Summer, as a probable effect of the South Atlantic Central Waters (SACW that compress Coastal Waters (CW toward the bay.

  1. Oportunismo alimentar de Knodus moenkhausii (Teleostei, Characidae: uma espécie abundante em riachos do noroeste do Estado de São Paulo, Brasil Feeding opportunism of Knodus moenkhausii (Teleostei, Characidae: an abundant species in streams of the northwestern in the state of São Paulo, Brazil

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    Mônica Ceneviva-Bastos

    2007-03-01

    Full Text Available O objetivo deste estudo foi investigar a biologia alimentar de Knodus moenkhausii (Eigenmann & Kennedy, 1903 em riachos do Alto rio Paraná no Estado de São Paulo. Em oito riachos (R1-R8, K. moenkhausii se alimentou de 18 itens, dos quais algas, ninfas de efemerópteros e larvas de dípteros foram os itens autóctones mais freqüentes e dominantes; fragmentos de insetos terrestres, himenópteros e aranhas foram os itens alóctones mais freqüentes e dominantes. No riacho R2, K. moenkhausii apresentou dieta distinta dos demais riachos, principalmente em função da profundidade, tipo de substrato e da presença de vegetação ripária. No riacho R9, amostrado mensalmente durante um ano, foram identificados 15 itens, dos quais insetos terrestres predominaram ao longo do ano; larvas de dípteros e algas foram pouco expressivas nos períodos de dezembro-janeiro (período mais quente e chuvoso e junho-julho (período mais frio e seco. No riacho R9 foram realizadas observações subaquáticas durante mergulho livre, onde observamos a cata de itens na coluna d'água junto do substrato, da vegetação submersa e na superfície da água. A elevada variedade de itens consumidos - condicionada às variações do hábitat e sazonais - e a prática de diversas táticas nos permitem considerar K. moenkhausii uma espécie oportunista quanto ao uso dos recursos alimentares. Este oportunismo aparentemente se reflete na abundância da espécie, demonstrando boa capacidade em alocar parte significativa de sua energia à reprodução, mesmo em ambientes fisicamente impactados por ação antrópica.In the present investigation we studied the feeding biology of Knodus moenkhausii (Eigenmann & Kennedy, 1903 in streams of the Upper Paraná river system in the state of São Paulo. In eight streams (R1-R8, K. moenkhausii consumed 18 items, of which algae, ephemeropteran nymphs, and dipteran larvae were the most frequent and dominant autochthonous items, as were terrestrial insects, hymenopterans, and spiders regarding allochthonous items. In the R2 stream, K. moenkhausii showed distinct diet, mostly due to depth, substrate type, and presence of riparian vegetation. In the R9 stream (monthly sampled for one year, 15 items were consumed, of which terrestrial insects predominated all year round; dipteran larvae and algae were least relevant during December-January (hot and wet period and June-July (cold and dry period, respectively. During snorkeling observations in this stream, we recorded individuals performing drift feeding, picking at relatively small preys close to the substrate and submerged vegetation, and surface picking. The large diversity of consumed items - conditioned to habitat and seasonal variations - and the diversity of feeding tactics allow us to consider K. moenkhausii a rather opportunistic fish species. Such opportunism apparently reflects on the species abundance, showing its ability to allocate a significant part of its energy to reproduction, even in physically impacted habitats by human actions.

  2. Registro de Moridae (Teleostei: Gadiformes en la Formación Chenque (Oligoceno Tardío-Mioceno Temprano de la provincia de Chubut, Argentina Record of Moridae (Teleostei: Gadiformes from the Chenque Formation (Late Oligocene - Early Miocene from the Chubut province, Argentina

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    Sergio Bogan

    2011-12-01

    Full Text Available En el presente trabajo se describen restos de un especimen relativamente completo perteneciente a la familia Moridae. Dicho ejemplar ha sido colectado en sedimentos referibles a la Formación Chenque (Oligoceno-Mioceno de la provincia de Chubut, Argentina. Este material constituye el primer registro fósil concreto de un Gadiformes para Argentina y los primeros materiales óseos fósiles registrados para Moridae. La morfología de los ejemplares sugiere afinidades con los géneros Physiculus y Salilota. La presencia de Moridae en el Mioceno Temprano de Patagonia y Nueva Zelanda se encuentra de acuerdo con hipótesis previas que indican conexiones marítimas transantárticas entre ambas regiones geográficas durante el Oligoceno Tardío - Mioceno Temprano.A nearly complete specimen belonging to the family Moridae is described in this paper. The material has been collected in outcrops referable to the Chenque Formation (Oligocene-Miocene from the Chubut province, Argentina. The specimen constitutes the first fossil record for the Gadiformes in Argentina and one of the first osteological occurrences for Moridae. The morphology of the specimen suggests affinities with the genera Physiculus and Salilota. The presence of Moridae in the Early Miocene of Patagonia and New Zealand is in agreement with previous hypotheses suggesting marine transantarctic connections between both landmasses during Late Oligocene - Early Miocene times.

  3. Condição reprodutiva da betara preta, Menticirrhus americanus (Teleostei, Sciaenidae, na pesca realizada no litoral norte de Santa Catarina, Brasil - DOI: 10.4025/actascibiolsci.v30i4.1230 Reproductive status of Menticirrhus americanus (Teleostei, Sciaenidae in fisheries performed on the Southern coast of Brazil - DOI: 10.4025/actascibiolsci.v30i4.1230

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    Elneison da Rosa Muniz

    2008-11-01

    Full Text Available No litoral brasileiro, a legislação costuma regular as práticas pesqueiras segundo o ciclo de vida das espécies-alvo, mas o fato deste não ser coincidente entre as espécies dominantes nas capturas dificulta o manejo em pescarias multiespecíficas. No litoral de Santa Catarina, o defeso aplica-se apenas à pesca de arrasto, e para tal considera o período reprodutivo do camarão sete-barbas, Xyphopenaeus kroyeri. O presente trabalho investiga a incidência da atividade pesqueira sobre indivíduos em reprodução da betara preta, Menticirrhus americanus, espécie comercialmente apreciada e frequente nas pescarias. As amostragens ocorreram em 2006 e 2007, em desembarques do município de Itapoá, norte do Estado (26°00’S; 48°36’W. Calcularam-se os valores de proporção sexual, frequência de estádios de maturação, índice gonadossomático e tamanho de primeira maturação, e relacionou-se a captura de indivíduos em reprodução com a época do ano e a arte de pesca utilizada. Concluiu-se que a atividade pesqueira incide sobre uma parcela populacional que compreende indivíduos em atividade reprodutiva durante, ao menos, duas estações do ano. Há diferenças entre as artes de pesca: a de arrasto não atinge indivíduos em reprodução; a de caceio atua majoritariamente sobre jovens e em maturação; e a de fundeio, principalmente sobre indivíduos em atividade reprodutiva, sobretudo na primavera e no verão.Fisheries rules usually take into account the life cycle of target species. But as these species differ, multi-specific fisheries prove difficult to be managed. In the southern coast of Brazil (26°00’S, 48°36’W, an annual closed fishing season is exclusive to trawling only, which target species such as the shrimp Xyphopenaeus kroyeri . In this region, the consequences of trawling and gillnets on the life cycles of fish remain unknown. The present work has surveyed the incidence of small-scale fisheries on the reproductive cycle of the Sciaenidae Menticirrhus americanus. Landings were sampled in 2006 and 2007, and sexual ratio, seasonal distribution of gonadal stages, gonadossomatic index and length at first maturity were estimated. Catches of reproductive individuals were analyzed according to the fishing season and fishing gears employed. Resultes showed that catches of Menticirrhus americanus include, at least during two seasons per year, individuals in breeding activity. Trawling does not catch maturing, mature or ripe specimens; gillnets of the caceio type act mainly on young and maturing individuals; and gillnets of the fundeio type act mainly on mature and ripe individuals, in spring and summer.

  4. Development of fingerlings of Piracanjuba (Brycon orbignyannus, Vallencienes (1849 (Teleostei: characidae in tanks fertilized with organic manures/ Desenvolvimento de juvenis de Piracanjuba (Brycon orbignyannus, Vallencienes (1849 (Teleostei: characidae em tanques experimentais fertilizados com adubação orgânica

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    Carmino Hayashi

    2005-06-01

    Full Text Available The objective of this paper was to study the development of Piracanjuba (Brycon orbignyanus in tanks under differents organic fertilizers. The experiment, entirely randomized, was accomplished in 16 tanks of 1000 liters, fertilized with manures of bovine (BOV, pigs (SUI, chickens (FRG and others without fertilizer (SAO, using 15 fish/m3 with an initial average weight and length of 10,87+0,31 g e 9,78+0,07 cm. After 30 days, the experiment showed a uniform development of the fish and high survival rate in thestudied density. The treatments presented significant statistical differences (PO objetivo deste trabalho foi estudar o desenvolvimento de juvenis de Piracanjuba (Brycon orbignyanus, em tanques com adubações orgânicas. O experimento, inteiramente casualizado, foi realizado em 16 tanques de 1000 litros, adubados com estercos de bovinos (BOV, suínos (SUI, frangos de corte (FRG e outros sem adubação (SAO, utilizando 15 peixes/m3 com peso e comprimento médios iniciais de 10,87+0,31 g e 9,78+0,07 cm. Após 30 dias, o experimento mostrou um desenvolvimento uniforme dos peixes e alta taxa de sobrevivência na densidade estudada. Os tratamentos apresentaram diferenças estatisticamente significativas (p < 0,05 para ganho de peso e crescimento diário, com exceção dos tratamentos BOV e SUI quando comparados entre si. A temperatura e o oxigênio dissolvido foram os fatores abióticos que exerceram maior influência sobre a biota aquática, afetando o desenvolvimento dos peixes. Entre o fitoplâncton houve maior abundância de organismos nanoplanctônicos favorecendo o desenvolvimento do zooplâncton, destacando-se as clorófitas, com o gênero Scenedesmus, e as cianofíceas, com o gênero Microcystis, e entre o zooplâncton, a maior abundância foi de rotíferos dos gêneros Brachionus e Keratella, seguido por copépodas. O tratamento adubado com esterco de frangos possibilitou um maior desenvolvimento da comunidade planctônica, e melhores resultados quanto ao desenvolvimento dos peixes, demonstrando a importância do alimento natural na sua dieta.

  5. Biologia reprodutiva de Micropogonias furnieri (Desmarest, 1823 (Teleostei, Sciaenidae: 1. fator de condição como indicador do período de desova The reproductive biology of Micropogonias furnieri (Desmarest, 1823 (Teleostei, Sciaenidae: 1. condition factor as an indicator of spawning period

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    Victoria Judith Isaac-Nahum

    1983-01-01

    Full Text Available A analise temporal da freqüência de estádios de maturação de 102 fêmeas adultas coletadas entre fevereiro de 1979 e janeiro de 1980 na região de Ubatuba, litoral norte do Estado de São Paulo, mostra que M. funieri, nessa área, apresenta três desovas durante o ano: uma no outono (abril-junho, outra no inverno (agosto-setembro e uma terceira na primavera-verão (novembro-fevereiro. Essa sugestão e reforçada pelas flutuações de K (fator de condição considerando-se o peso das gonadas e K' (sem considerar o peso das gonadas, durante um ciclo reprodutivo. Os valores máximos de K e K' coincidem com os picos de ocorrencia de indivíduos com gonadas maturas (C e, os mínimos, com os de indivíduos com gonadas esvaziadas (D, A diferença entre K e K' (AR estima a "condição da gonada" apresentando seus máximos nos períodos de mais intensa atividade dos ovários, contituindo-se, assim, o valor de AK em um índice indireto de maturidade e dos períodos de desova de M. funieri.The monthly analysis of maturity stage frequency of adult females caught monthly at the Ubatvíba region, SP, from February 1979 to January 1980, suggests that M. funieri spaws three times ayear: Autumn (April-June , Winter (August-Sept ember and Spring-Summer (November-February. Condition factor fluctuations estimated with andwithout gonads K and K' during a reproductive cycle reinforces hypothesis0 K and K' maximum values relate precisely with higher frequency periods of a females at advanced stages of maturity (C. On the other hand, K and K' minimum values are concomitant with higher frequency periods of spent females (D. Although K and K' have a similar evolution, there are some periods in which ΔK (K-K' appears higher: May, August-September and November. These periods are also related to the maximum frequency of females in stage C. As AX estimes the "gonad condition", establishing the periods when the gonad attains the maximum weight in relation to body weight, and so the more advances of maturity stages, it can be used as a maturity and breeding season index.

  6. Morfologia e hábitos alimentares de duas espécies de Engraulidae (Teleostei, Clupeiformes na Baía de Sepetiba, Rio de Janeiro Morphology and feeding habits of two engraulid fish (Teleostei, Clupeiformes in the Baía de Sepetiba, Rio de Janeiro

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    Sandra Sergipensel

    1999-01-01

    Full Text Available Foram estudados as hábitos alimentares dos peixes engraulídeos Anchoa januaria e Cetengraulis edentulus na Baía de Sepetiba, Rio de Janeiro, de julho de 1983 a julho de 1985. Os itens alimentares e as estruturas morfológicas relacionadas à alimentação indicaram que a área superficial dos rastros branquiais de A. januaria e C. edentulus é mais eficiente para a filtração dos alimentos, do que as distâncias entre os mesmos. Estas estruturas morfológicas possibilitam uma seletividade no tamanho dos itens alimentares, resultando em formas distintata de obtenção do alimento, entre as duas espécies. A. januaria seleciona o zooplâncton, por captura dos itens alimentares, enquanto C. edentuluss é um fitoplanctófago filtrador. Anchoa januaria tem hábitos alimentares diurnos e explgra diferentes estratos da coluna d'água durante os períodos frio e quente.Feeding habits of the engraulidid flsh - Anchoa januaria and Cetengraulis edentullus were studied in the Baía de Sepetiba, Rio de Janeiro, from July 1983 to July 1985. Dietary items and morphological structures "blted to feeding indicate that the surface structures of branchial rays of A. januaria and C. edentulus are more useful for food filtration than the distance between them. Those morphological structures provide a separation of the size of dietary items, thw resoltins in different forms of feeding behaviors between two species. A. januaria is a selective zooplanktivore, picking up food items, whereas C. edentulus is a filtering phytaplanktivore. Anchoa januaria is a diurnal feeder and exploits different layers in the water column during the warm and cold seasons.

  7. Inoculação bacteriana de Aeromonas hydrophila e a sobrevivência de juvenis de jundiá, Rhamdia quelen (Teleostei: Pimelodidae Inoculation with Aeromonas hydrophila bacteria and the survival of juvenile jundiá, Rhamdia quelen (Teleostei: Pimelodida

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    Cheila de Lima Boijink

    2001-06-01

    Full Text Available Visando a estudar a resistência do jundiá (Rhamdia quelen, é que se inoculou, por via intramuscular, as suspensões de 1,3 x 10(9 e 3,5 x 10(8 UFC (Unidades Formadoras de Colônia de Aeromonas hydrophila/m de solução salina. Dos 96 juvenis submetidos à inoculação, distribuídos em seis caixas d'água de amianto, 32 constituíram o grupo controle, em que os animais foram injetados com solução salina esterilizada. A partir do momento da inoculação de 1m do respectivo tratamento, foi observado que os peixes inoculados com a bactéria tiveram seu comportamento alterado, permaneceram estáticos no fundo da caixa e apresentaram 100% de mortalidade em 24 horas. Os peixes do grupo controle injetados com salina não apresentaram nenhuma anormalidade no comportamento. Sendo assim, é possível concluir que as concentrações 1,3 x 10(9 e 3,5 x 10(8UFC/m de solução salina são letais para juvenis de jundiá.The present work studied the resistance of the "Jundiá" (Rhamdia quelen, after intramuscular inoculation with 1.3 x 10(9 and 3.5 x 10(8 UFC (Unity Formation of Colony suspension of Aeromonas hydrophila/m saline solution. Thirty two fish of a total of 96 utilized fish served as control that werw inoculated with saline solution. Fish were distributed in six amianthus aquarium. After inoculation, fish submitted to bacterial suspensions showed behaviour changes and apathy at the botton of aquarium. One hundred percent of mortality was observed 24 hours after inoculation. In conclusion, 1.3 x 10(9 and 3.5 x 10(8UFC/m saline solution were lethal for this species of fish.

  8. Estudos cariotípicos de peixes da familia Sciaenidae (Teleostei, Perciformes da região de Cananéia, SP, Brasil: 2. sobre o cariótipo de Menticirrhus americanus (Linnaeus,1758 Karyotypical study on fishes of family Sciaenidae (Teleostei, Perciformes from the region of Cananéia, SP Brazil: 2. on the karyotype of Menticirrhus americanus (Linnaeus, 1758

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    Vicente Gomes

    1983-01-01

    Full Text Available Estudou-se o cariótipo de Menticirrhus americanus (Linnaeus, 1758, peixes teleósteos da família Sciaenidae, coletados na região estuarino-lagunar de Cananéia, SP, Brasil. Foram realizadas preparações de cromossomos mitóticos e meióticos e ensaios de bandeamentos C e G. O número diplóide encontrado para a espécie foi de 2n = 48 cromossomos, tipo t cujos tamanhos variaram entre 3,18 µm e 1,47 µm, em média, do maior para o menor par. O primeiro par de homólogos apresenta uma constricção secundária no terço superior dos cromossomos. O número haplóide encontrado foi n = 24. O conteúdo diplóide de DNA foi de 1,57 ± 0,03 picogramas por célula. Nao se obteve padrão nítido de bandas G, mas a aplicação da técnica facilitou a identificação de alguns pares adjacentes e a visualização da constricção secundária. Bandas C localizam-se, principalmente, nas regiões pericentrométricas.The chromosomes of M. americanus was studied. The diploid number is 48 acrocentric chromosomes and the haploid number is 24. The diploid DNA content of blood cell nucleus was measured. C- and G- banding techniques were tried.

  9. Análisis comparado de las especies del género Bryconamericus (Teleostei: Characidae en la cuenca de los ríos Cauca-Magdalena y Ranchería, Colombia Comparative analysis of species of the genus Bryconamericus (Teleostei: Characidae from Cauca, Magdalena and Ranchería basin rivers in Colombia

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    César Román-Valencia

    2009-08-01

    Full Text Available Se analizan las especies de Bryconamericus Eigenmann 1907 para la cuenca de los ríos Magdalena-Cauca y Ranchería, con base en material tipo y no tipo; además se establece la distribución geográfica de B. caucanus. Se emplean caracteres merísticos, morfométricos y osteológicos para definir la variación morfológica entre las especies de Bryconamericus analizadas. La forma de los Bryconamericus se estudió mediante un análisis de componentes principales (ACP, donde las medidas fueron previamente transformadas para corregir el efecto de talla y alometría. El número de vértebras diferenció a B. caucanus de otras especies del río Magdalena (37-39 vs. 40-42. Se encontró que B. arilepis Román-Valencia, Vanegas-Ríos and Ruiz-C. 2008 se distingue de los demás Bryconamericus del río Magdalena por las escamas en la línea lateral (50-54 vs. 34-50 y las escamas entre el origen de la aleta dorsal y la línea lateral (9-11 vs. 5-8. El índice de forma (IF construido a partir del ACP confirmó las especies que comparten el mismo perfil: B. caucanus Eigenmann 1913 y B. plutarcoi Román-Valencia 2001, B. tolimae Eigenmann 1913, B. huilae Román-Valencia 2003, B. arilepis y Bryconamericus sp. nov. (en prensa, ambos grupos distinguibles entre sí. El análisis de varianza demostró que existen diferencias significativas entre las longitudes de las aletas pélvicas entre las especies de Bryconamericus (F= 44,7; p= 0,000. Se observaron significancias en las longitudes de la aleta anal, al confrontar las especies de Bryconamericus analizadas (F= 44,03; p= 0,000. Las poblaciones de B. caucanus de la parte baja del río Cauca son las que poseen mayor afinidad en forma con las demás poblaciones del río Ranchería, alto y medio Cauca y bajo Magdalena. Se determina que Hemibrycon dentatus y H. decurrens son sinónimos modernos de B. caucanus; se confirma la existencia de 2 especies nuevas para el río Sogamoso, cuenca del río Magdalena, y se establece la distribución geográfica de B. caucanus en la cuenca de los ríos Sinú, Ranchería, Cauca y bajo Magdalena.We reviewed Bryconamericus species from the Cauca, Magdalena and Ranchería rivers in Colombia using type and new specimens. The geographic distribution of B.caucanus was determined. We determined the morphological variation among Bryconamericus species analyzed using meristic, morphometric and osteological characters. The shape of Bryconamericus was analyzed using principal component analysis (PCA, in which measurements were previously processed to correct for the effect of size. The number of vertebrae differentiated B. caucanus from other species of the Magdalena River (37-39 vs.40-42. Bryconamericus arilepis Roman-Valencia et al 2008 differs from other Río Magdalena Bryconamericus in lateral-line scales (50-54 vs. 34-50 and scales between dorsal-fin origin and lateral line (9-11 vs. 5-8. The index of form (IF built with PCA confirmed the validity of species that share the same shape: B. caucanus Eigenmann 1913 andB. plutarcoi Roman-Valencia 2001, B. tolimae Eigenmann 1913, B. huilae Roman-Valencia 2003, B. arilepis and Bryconamericus sp. nov. Román-Valencia, Vanegas-Ríos and Ruiz-C. in press, and the 2 groups were distinguishable from each other. An ANOVA showed significant differences in pelvic-fin length among species of Bryconamericus (F = 44.7, p = 0000. Anal-fin length was also useful to distinguish the studied species (F = 44.03, p = 0000. Populations of B. caucanus from the lower Río Cauca show greatest similarity in shape with all other populations from Río Ranchería, upper and lower Cauca, and middle Magdalena. Hemibrycon dentatus andH. decurrens are shown to be synonyms of B. caucanus. We reconfirm the existence of 2 new species of Bryconamericus from Río Sogamoso, in the Río Magdalena basin. The geographical distribution of B. caucanus in the Sinú, Ranchería, Cauca and lower Magdalena river basins is established.

  10. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae - doi: 10.4025/actascibiolsci.v32i4.4462 Dusky grouper Epinephelus marginatus (Lowe, 1834 (Teleostei, Serranidae gastrintestinal anatomy and histology - doi: 10.4025/actascibiolsci.v32i4.4462

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    José Roberto Machado Cunha da Silva

    2010-11-01

    Full Text Available A garoupa-verdadeira (Epinephelus marginatus é uma espécie de serranídeo com grande importância ecológica e boas perspectivas para o cultivo. A investigação da morfologia do trato digestório, associada à atividade alimentar, é fundamental para a compreensão da biologia dessa espécie e premissa básica para pesquisas sobre requerimentos nutricionais, desenvolvimento de rações e práticas adequadas de manejo alimentar. O presente trabalho descreve a anatomia e, por meio da microscopia de luz, as variações histológicas ao longo do tubo digestório de juvenis de Epinephelus marginatus, correlacionando a histologia de cada seguimento com as respectivas funções e o hábito alimentar. Verificou-se que essa espécie possui elevado número de tipos celulares ao longo do tubo digestório que estão intimamente relacionados com a resposta imunológica inata e adaptativa, permitindo o hábito alimentar detritívoro.The dusky grouper (Epinephelus marginatus is a serranida species with great ecological importance and good perspectives for rearing. The investigation of the digestive tract morphology associated to the feeding activity is essential for the understanding of the biology of this species and a basic premise for research on feed requirements, feed development and appropriate feeding methods. The present study describes the anatomy and histological variations along the digestive tract of Epinephelus marginatus juveniles associating the histology with function and feeding habit. It was verified that this species possesses a high number of different cellular types along the digestive tube intimately related with the innate and adaptative immunological responses.

  11. Morfologia e crescimento do músculo estriado esquelético no pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae - DOI: 10.4025/actascibiolsci.v30i2.3640 Morphology and skeletal muscle growth in pirarucu Arapaima gigas Cuvier, 1817 (Teleostei, Arapaimidae - DOI: 10.4025/actascibiolsci.v30i3.3640

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    Maeli Dal Pai Silva

    2008-05-01

    Full Text Available O objetivo deste trabalho foi avaliar as características morfológicas e de crescimento do músculo estriado esquelético no pirarucu (Arapaima gigas. Foram utilizados animais em duas fases de crescimento: alevinos, com 50 dias de idade, e juvenis, com um ano de idade. Após eutanásia dos animais, fragmentos musculares das regiões dorsal, lateral cranial e lateral caudal foram coletados e congelados em nitrogênio líquido. Cortes histológicos (10 µm foram submetidos às colorações HE e Tricrômico de Gomori, para a análise morfológica, e NADH-TR, para a análise do metabolismo oxidativo das fibras musculares. Foi calculado o menor diâmetro das fibras musculares brancas nas regiões dorsal e lateral cranial. A musculatura dorsal branca mostrou-se mais desenvolvida e, na musculatura lateral, observaram-se compartimentos distintos: superficial vermelho e profundo branco. Nos alevinos, o crescimento muscular ocorreu predominantemente por hiperplasia das fibras e, nos juvenis, predominou o crescimento muscular por hipertrofia.The aim of this work was to evaluate the morphological and growth characteristics of skeletal muscle tissue in pirarucu (Arapaima gigas using alevins (50 days old and juveniles (1 year old. Muscle samples were collected from dorsal, lateral cranial, and lateral caudal regions, and then frozen in liquid nitrogen. Histological frozen sections (10 µm were stained with HE and Gomori Trichrome for morphological analysis, and NADH-TR to evaluate muscle fiber oxidative metabolism. Morphometric analysis samples were obtained from dorsal and lateral cranial regions, and smallest diameter white fibers were measured. White dorsal muscle was thicker and two muscle fiber compartments were identified in the lateral cranial region: red (superficial and white (deep muscle. Hyperplasia muscle growth predominated in alevins and hypertrophy in juveniles.

  12. Dinâmica populacional de Characidium lauroi e C. alipioi (Teleostei, Crenuchidae) na microbacia do Ribeirão Grande, serra da Mantiqueira Oriental, Estado de São Paulo = Population dynamics of Characidium lauroi and C. alipioi (Teleostei, Crenuchidae) in the Ribeirão Grande microbasin, eastern Serra da Mantiqueira, São Paulo State

    OpenAIRE

    Alberto Luciano Carmassi; Ursulla Pereira Souza; Francisco Manoel de Souza Braga

    2007-01-01

    Em riachos de pequena ordem, o alto e variável fluxo de água oferece tanto vantagens como desvantagens para o ciclo de vida de peixes. Mesmo espécies próximas que vivem em habitats semelhantes podem apresentar diferentes em seus padrões de ciclo de vida. Com base na distribuição de tamanho de ovócitos, C. lauroi foi classificada no tipo de desova parcelada, e C. alipioi no tipo de desova total. A fecundidade absoluta de C. lauroi variou de 1.313 a 2.925 ovócitos; em C. alipioi, a fecundidade ...

  13. Dinâmica populacional de Characidium lauroi e C. alipioi (Teleostei, Crenuchidae na microbacia do Ribeirão Grande, serra da Mantiqueira Oriental, Estado de São Paulo = Population dynamics of Characidium lauroi and C. alipioi (Teleostei, Crenuchidae in the Ribeirão Grande microbasin, eastern Serra da Mantiqueira, São Paulo State

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    Alberto Luciano Carmassi

    2007-07-01

    Full Text Available Em riachos de pequena ordem, o alto e variável fluxo de água oferece tanto vantagens como desvantagens para o ciclo de vida de peixes. Mesmo espécies próximas que vivem em habitats semelhantes podem apresentar diferenças em seus padrões de ciclo de vida. Com base na distribuição de tamanho de ovócitos, C. lauroi foi classificada no tipo de desova parcelada, e C. alipioi no tipo de desova total. A fecundidade absoluta de C. lauroi variou de 1.313 a 2.925 ov��citos; em C. alipioi, a fecundidade absoluta variou de 2.213 a 25.550 ovócitos. A prova não-paramétrica de correlação de Spearman mostrou haver significância entre a relação gonadossomática e a fecundidade para ambas as espécies. Os parâmetros de crescimento, a taxa de mortalidade natural e a taxa de sobrevivência para fêmeas de C. lauroi foram: K = 0,68 ano-1, Loo = 8,7 cm, tmax = 4,4 anos, M = 1,62 ano-1, S = 19,79%, e para machos: K = 0,78 ano-1, Loo = 6,9 cm, tmax = 3,8 anos, M = 1,89 ano-1, S = 15,11%. Os parâmetros de crescimento, a taxa de mortalidade natural e a taxa de sobrevivência para fêmeas de C. alipioi foram: K = 0,90 ano-1, Loo = 12,2 cm, tmax = 3,3 anos,M = 1,81 ano-1, S = 16,37%, e para machos: K = 0,76 ano-1, Loo = 10,1 cm, tmax = 3,9 anos, M = 1,71 ano-1, S = 18,10%.In low-order streams, the high and variable water flow rates offer both advantages and disadvantages to the life cycle of fishes. Even closely related species living in similar habitats can show differences in life history patterns. Based on oocyte-sizedistributions, C. lauroi was classified into the fractional spawning type, and C. alipioi into the total spawning type. The absolute fecundity of C. lauroi ranged from 1,313 to 2,925 oocytes; in C. alipioi the absolute fecundity ranged from 2,213 to 25,550 oocytes. The nonparametric Spearman correlation test showed statistical significance between the gonadosomatic index and fecundity for both species. The growth parameters, natural mortality rate and survivalrate for females of C. lauroi were: K = 0.68 yr-1, Loo = 8.7 cm, tmax = 4.4 years, M = 1.62 yr-1, S = 19.79%, and for males: K = 0.78 yr-1, Loo = 6.9 cm, tmax = 3.8 years, M = 1.89 yr-1, S = 15.11%. The growth parameters, natural mortality rate and survival rate for females ofC. alipioi were: K = 0.90 yr-1, Loo= 12.2 cm, tmax = 3.3 years, M = 1.81 yr-1, S = 16.37%, and for males: K = 0.76 yr-1, Loo = 10.1 cm, tmax = 3.9 years, M = 1.71 yr-1, S = 18.10%.

  14. Análise comparativa da alimentação de peixes (Teleostei entre ambientes de marisma e de manguezal num estuário do sul do Brasil (Baía de Guaratuba, Paraná Study on feeding habits in estuarine fish (Teleostei comparatively between salt marshes and mangroves in southern Brazil (Guaratuba Bay

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    Paulo de T. Chaves

    2008-03-01

    Full Text Available Estudou-se a composição da dieta de peixes em dois tipos de ambiente de áreas rasas estuarinas - marisma e manguezal, objetivando avaliar se essas formações vegetais desencadeiam na ictiofauna respostas diferentes quanto à alimentação. As seis espécies avaliadas, as mais abundantes nessas áreas, mostraram-se predominantemente planctívoras, porém com particularidades quanto ao tipo de vegetação ocupada. Na marisma, Atherinella brasiliensis (Quoy & Gaimard, 1825 apresentou a dieta com maior número de itens e menor similaridade em relação às demais espécies. No manguezal tal isolamento coube a Anchoa januaria (Steindachner, 1879, espécie com maior participação de Decapoda Brachyura e Decapoda não-Brachyura, e única que nesse ambiente incluiu Gammaridae na dieta. Anchoviella lepidentostole (Fowler, 1911 identificou-se com Anchoa lyolepis (Evermann & Marsh, 1900 na marisma e com Opisthonema oglinum (Le Sueur, 1818 e Harengula clupeola (Cuvier, 1829 no manguezal. Uma situação comum a marisma e manguezal registrou-se entre O. oglinum e H. clupeola, espécies com dietas praticamente restritas a Diatomacea e Copepoda. Evidenciou-se o quanto as espécies são capazes de variar sua dieta com o ambiente, provavelmente em resposta à disponibilidade local. Mais que isso, porém, constatou-se que, seja na marisma, seja no manguezal, mesmo havendo mudança nos hábitos tróficos das espécies, cada uma delas mantém um padrão de diferenças em relação às demais que compõem a assembléia, fato que possivelmente assegura a abundância e coexistência entre elas nas áreas estuarinas rasas.Diet of fish inhabiting shallow waters close to salt marshes and mangroves was analyzed in order to evaluate how different the influence of these environments on fish feeding habits is. The six studied species, the most abundant in these areas, are mainly planctyvores, however they showed particularities in each area. In salt marshes Atherinella brasiliensis (Quoy & Gaimard, 1825 presented the largest number of food items and the lowest value of similarity regarding other species. In mangroves these attributes were presented by Anchoa januaria (Steindachner, 1879, the main species to feed on Brachyura and non-Brachyura Decapoda, and the only one in this area that includes Gammaridae in its diet. Anchoviella lepidentostole (Fowler, 1911 showed a large affinity with Anchoa lyolepis (Evermann & Marsh, 1900 in salt marshes but a large one with Opisthonema oglinum (Le Sueur, 1818 and Harengula clupeola (Cuvier, 1829 in mangroves. Similar behaviour between salt marsh and mangrove has linked H. clupeola to O. oglinum, in which diet was composed almost integrally by Diatomacea and Copepoda. The ability of fish to change their feeding habits according to the environment is well-known worldwide; here it probably results from the availability of preys, which is supposed to be different between salt marshes and mangroves. However, it was also observed that, although food items change from salt marsh to mangrove, the relationships between species remain different in both areas, helping them to be abundant in the shallow estuarine waters.

  15. Anatomia e histologia gastrintestinal da garoupa-verdadeira Epinephelus marginatus (Lowe, 1834) (Teleostei, Serranidae) - doi: 10.4025/actascibiolsci.v32i4.4462 Dusky grouper Epinephelus marginatus (Lowe, 1834) (Teleostei, Serranidae) gastrintestinal anatomy and histology - doi: 10.4025/actascibiolsci.v32i4.4462

    OpenAIRE

    José Roberto Machado Cunha da Silva; Marcus Silva de Oliveira; Eduardo Gomes Sanches; João Carlos Shimada Borges

    2010-01-01

    A garoupa-verdadeira (Epinephelus marginatus) é uma espécie de serranídeo com grande importância ecológica e boas perspectivas para o cultivo. A investigação da morfologia do trato digestório, associada à atividade alimentar, é fundamental para a compreensão da biologia dessa espécie e premissa básica para pesquisas sobre requerimentos nutricionais, desenvolvimento de rações e práticas adequadas de manejo alimentar. O presente trabalho descreve a anatomia e, por meio da microscopia de luz, as...

  16. Complete sequence of the mitochondrial genome of ...

    Indian Academy of Sciences (India)

    Supplementary data: Complete sequence of the mitochondrial genome of Odontamblyopus rubicundus (Perciformes: Gobiidae): genome characterization and phylogenetic analysis. Tianxing Liu, Xiaoxiao Jin, Rixin Wang and Tianjun Xu. J. Genet. 92, 423–432. Figure 1. Gene map of O. rubicundus mitochondrial genome.

  17. Species composition and recruitment of tidal pool fishes in KwaZulu ...

    African Journals Online (AJOL)

    Fishes occurring in a lower shore tidal pool near Durban, South Africa, were collected using rotenone at monthly intervals for a year. Eighteen teleost families and 50 lower taxa of fishes were recorded. Cryptic Tripterygiidae, Blenniidae and Gobiidae were particularly abundant while Pomacentridae, Acanthuridae, ...

  18. Nigerian Journal of Fisheries - Vol 5, No 2 (2008)

    African Journals Online (AJOL)

    Changes in the trophic attributes of the Altantic Mudskipper, Periophthalmus barbarus (Gobiidae) between a mangrove and Nipa swamp creek of Qua river estuary, Nigeria · EMAIL FULL TEXT EMAIL FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. MT Udo, AW Akpan, IE Ekpo, M Essien-Ibok, PE Lebo.

  19. Author Details

    African Journals Online (AJOL)

    Essien-Ibok, M. Vol 5, No 2 (2008) - Articles Changes in the trophic attributes of the Altantic Mudskipper, Periophthalmus barbarus (Gobiidae) between a mangrove and Nipa swamp creek of Qua river estuary, Nigeria Abstract. ISSN: 1597-443X. AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for ...

  20. The diet of reservoir perch before, during and after establishment of non-native tubenose goby

    Czech Academy of Sciences Publication Activity Database

    Všetičková, Lucie; Mikl, Libor; Adámek, Zdeněk; Prášek, Václav; Roche, Kevin Francis; Jurajda, Pavel

    2018-01-01

    Roč. 419, č. 419 (2018), č. článku 4. ISSN 1961-9502 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:68081766 Keywords : dietary shift * food preference * Gobiidae * invasive species * Perca fluviatilis * piscivore diet Subject RIV: EG - Zoology Impact factor: 1.217, year: 2016