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Sample records for cuvier pisces clupeiformes

  1. Dinâmica populacional, biologia reprodutiva e o ictioplâncton de Cetengraulis edentulus Cuvier (Pisces, Clupeiformes, Engraulidae na enseada do Saco dos Limões, Florianópolis, Santa Catarina, Brasil Population dynamics, reproductive biology and the ichthyoplankton of Cetengraulis edentulus Cuvier (Pisces, Clupeiformes, Engraulidae in the Saco dos Limões cove, Florianópolis, Santa Catarina, Brazil

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    José M. Souza-Conceição

    2005-12-01

    Full Text Available Os dados utilizados neste estudo são originários de um monitoramento ambiental realizado na enseada do Saco dos Limões, Florianópolis, Santa Catarina, Brasil. Neste monitoramento foram coletadas amostras da ictiofauna, sendo separados para análise um total de 3820 exemplares de Cetengraulis edentulus Cuvier, 1828, capturados em 17 coletas, no período compreendido entre julho de 1999 e abril de 2001. A análise dos dados permitiu estimar parâmetros populacionais e reprodutivos importantes como o comprimento de primeira maturação (118 mm para sexos grupados, 112 e 118 mm para machos e fêmeas, respectivamente, as distribuições de freqüências de comprimento, a relação peso-comprimento (Pt = 0,0000003 x Ct 3,67º8, a proporção sexual ao longo do tempo, a variação sazonal dos estádios de maturação gonadal, o índice gonadossomático, o fator de condição e o fator de condição somático, o ciclo reprodutivo e o período de desova, sendo também determinada a participação da espécie no ictioplâncton. Foram determinadas as correlações entre os parâmetros biológicos e os ambientais de temperatura e salinidade da água, superficial e de fundo. Constatou-se que a espécie utiliza o ambiente de estudo ao longo de todo seu ciclo de vida, tanto para reprodução quanto para a alimentação e o crescimento, e está estrategicamente adaptada às condições ambientais e biológicas da área de estudo.Data used in this study are from a monitoring program conducted in the Saco dos Limões cove, Florianópolis, Santa Catarina, Brazil. In this program, fish fauna were collected in 17 surveys from July 1999 to April 2001. For this study, 3820 individuals of Centengraulis edentulus Cuvier, 1828 were examined regarding population and reproductive parameters, such as, length at sexual maturity (118 mm for the combined sexes, 112 mm for males and 118 mm for females, frequency distributions for total length, length-weight relationship (Wt

  2. Variabilidad de las comunidades de parásitos metazoos del róbalo Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae en Chile Variability of metazoan parasite communities in the rock cod Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae off Chile

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    MARIO GEORGE-NASCIMENTO

    2009-06-01

    Full Text Available La comparación de las variaciones en el tiempo cronológico y en el espacio es uno de los aspectos menos estudiados en la ecología de las comunidades de parásitos. Por eso, en este estudio se compara la abundancia total, riqueza y composición de las infracomunidades de parásitos del róbalo Eleginops maclovinus (Cuvier & Valenciennes, 1830 (Pisces: Eleginopidae, entre muestras tomadas en Chile centro-sur en tres localidades geográficas (Talcahuano, Puerto Montt y Punta Arenas, y en dos momentos del tiempo en cada una de ellas. En el conjunto de las 126 infracomunidades examinadas se encontraron 18 taxa de parásitos. La abundancia total y la composición de las infracomunidades se modificaban con la ontogenia del hospedador. Sin embargo, se encontró que la variación entre años en una localidad es de similar magnitud a la que hay entre lugares geográficos, luego de corregir por el efecto de la ontogenia del hospedador. Estos resultados resaltan la necesidad de implementar diseños de muestreo más rigurosos al momento de usar a los parásitos como marcadores biológicos de las poblaciones de hospedadores. Se propone que futuros estudios en las fuentes de variación de las comunidades de parásitos mejoren la descripción de estas variaciones con diseños de muestreo con medidas replicadas en el tiempo y el espacio.Comparison of variations in both chronological time and space is one of the least studied subjects in the ecology of parasite communities. Thus, we compared the abundance, richness and composition of parasite infracommunities in the rock cod Eleginops maclovinus (Cuvier & Valenncienes, 1830 (Pisces: Eleginopidae, between three widely separated localities along south-central Chile (Talcahuano, Puerto Montt and Punta Arenas, which were sampled in two different years each. Eighteen parasite taxa were taxonomically determined in the 126 hosts examined. Total abundance and infracommunity composition changed along host ontogeny

  3. Optic chiasm in the species of order Clupeiformes, family Clupeidae: optic chiasm of Spratelloides gracilis shows an opposite laterality to that of Etrumeus teres.

    Science.gov (United States)

    Mogi, Kazue; Misawa, Kazuya; Utsunomiya, Kentaro; Kawada, Yuta; Yamazaki, Toshihisa; Takeuchi, Shigeo; Toyoizumi, Ryuji

    2009-09-01

    In most teleost fishes, the optic nerves decussate completely as they project to the mesencephalic region. Examination of the decussation pattern of 25 species from 11 different orders in Pisces revealed that each species shows a specific chiasmic type. In 11 species out of the 25, laterality of the chiasmic pattern was not determined; in half of the individuals examined, the left optic nerve ran dorsally to the right optic nerve, while in the other half, the right optic nerve was dorsal. In eight other species the optic nerves from both eyes branched into several bundles at the chiasmic point, and intercalated to form a complicated decussation pattern. In the present study we report our findings that Spratelloides gracilis, of the order Clupeiformes, family Clupeidae, shows a particular laterality of decussation: the left optic nerve ran dorsally to the right (n=200/202). In contrast, Etrumeus teres, of the same order and family, had a strong preference of the opposite (complementary) chiasmic pattern to that of S. gracilis (n=59/59), revealing that these two species display opposite left-right optic chiasm patterning. As far as we investigated, other species of Clupeiformes have not shown left-right preference in the decussation pattern. We conclude that the opposite laterality of the optic chiasms of these two closely related species, S. gracilis and E. teres, enables investigation of species-specific laterality in fishes of symmetric shapes.

  4. PISC: Introduction and status overview

    International Nuclear Information System (INIS)

    Crutzen, S.; Nichols, R.W.

    1994-01-01

    Inspection will be able to play its role in the Structural Integrity assessment scheme and therefore in Pressure Components Safety Assessment. Inspection techniques are or will soon be able to furnish in a reliable way the information needed on the 'Status of the structure' for what concerns the presence, location, size and characteristics of defects. The effectiveness and reliability of these inspections will depend very much on the way in which they will be qualified and PISC III contributes much to the development of qualification schemes and in particular to performance demonstration of inspection procedures. The experimental work of PISC III is now ended and with it the funding of the PISC programme. However, the evaluation and use of PISC data generated by the different Round Robin Tests will certainly continue for several years as well as the cooperation spirit which characterized these 20 years of NDE effectiveness evaluation. (orig.)

  5. French participation to PISC III

    International Nuclear Information System (INIS)

    Birac, C.

    1994-06-01

    The PISC III programme was set up in 1986 after the conclusions of the PISC II programme. The main objective was assessment of ISI procedures on few particular components or materials. France with IPSN, CEA/DTA, DCN INDRET, EDF, FRAMATOME and INTERCONTROLE decided to have an important participation in several of the eight actions. This paper describes shortly the key points of this participation and the consequences in France. (authors). 10 figs., 1 tab

  6. Morphological development of Anchoviella vaillanti (Steindachner, 1908 (Clupeiformes: Engraulidae larvae and early juveniles

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    Anailza Cristina G. da Silva

    Full Text Available The considerable similarity in the early life stages of different fish species makes egg and larvae identification in fishery biology and ichthyoplankton surveys a difficult task. Knowledge on early larval development of morphologically similar taxa and species-rich orders, such as Clupeiformes, mainly in the Neotropical fresh waters is rather limited. The aim of the present study was to describe morphological and meristic aspects of the larvae and early juveniles of Anchoviella vaillanti, an endemic species of the São Francisco River basin in Brazil. The characterization was based on an ontogenetic series of 132 individuals (1.3-51.0 mm SL. In the larval period, body varies from elongated to very elongated and the head is small, which is typical of Clupeiformes. The finfold is present beginning in the yolk-sac stage, when larvae have a large yolk sac, until the flexion stage. Pectoral fin buds are the first to form during the preflexion stage, when dorsal- and anal-fin pterygiophores and hypural bones are first visible. The total vertebra count ranges from 36 to 39 and the myomere number ranges from 31 to 45. Complete fin formation obeys the following sequence: anal and dorsal fins during flexion stage; and pectoral, pelvic and caudal fins during postflexion stage. Despite being the only freshwater clupeiform representative in the São Francisco River, A. vaillanti may occur sympatrically with A. lepidentostole in the lower stretches of the river basin. Although early larvae characteristics of A. lepidentostole are not known, its late larvae and early juveniles may be distinguished from those of A. vaillanti, by the higher number of dorsal-fin rays (15 or 16 vs. 12 or 13 in A. vaillanti, higher total vertebra count (40 vs. 37 to 40 and shorter pre-pectoral length (14 to 16 vs. 22.8 to 28.9% SL.

  7. Making progress with PISC III

    International Nuclear Information System (INIS)

    Crutzen, S.; Nichols, R.; McDonald, N.

    1989-01-01

    The thirdphase of the Programme for the Inspection of Steel Components (PISC III) was begun in 1986 with the aim of assessing inspection capability and reliability for actual defects in full scale components under realistic nuclear power plant conditions. It is organized by the OECD Nuclear Energy Agency and the Ispra Joint Research Centre of the European Communities Commission. The objectives and status of each of the seven areas of PISC III are given. The areas are: real contaminated structures; full scale vessel tests; nozzles and dissimilar metal welds; austenitic steel testing; steam generator integrity testing; mathematical modelling of non-destructive examination; and human reliability studies. (U.K.)

  8. Anatomy of the bucco-pharyngeal cavity of Salminus brasiliensis (Cuvier, 1817 (Pisces, Characidae, Salmininae

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    Eliane Menin

    2006-03-01

    Full Text Available The bucco-pharyngeal cavity of Salminus brasiliensis, an ichthyophagous species of fresh water, is anatomically adapted to predation. The wide buccal rift, the oral-aboral enlargement of the buccal cavity and the reduced thickness of the pharyngeal mastigatory apparatus favor the capture and deglutition of larger prey. In function of the oral and pharyngeal dentition type, pre-digestive food preparation does not occur. The pointed and curved teeth, together with the tongue which is relatively mobile, prevent the prey’s escape from the buccopharyngeal cavity. The passage of the food is facilitated by the absence of pronounced folds in the mucous membrane of this cavity and by the disposition of the oral and pharyngeal teeth. The characteristics of flat and thin lips, developed oral dentition, relatively mobile tongue, mucous membrane without folds, pharynx with denticules disposed in dentigerous areas and plates, and short and sharp gill-rackers are anatomical adaptations which are shared by S. brasiliensis and other ichthyophagous Characiformes species such as Salminus maxillosus, Salminus hilarii, Hoplias malabaricus, Hoplias lacerdae, Acestrorhynchus lacustris and Acestrorhynchus britskii. However, different to the mentioned species, except other Salmininae, S. brasiliensis possesses oral teeth of an unique type, present only in the jawbones and distributed in two series.

  9. Glycoconjugates in the branchial mucous cells of Cynoscion guatucupa (Cuvier, 1830 (Pisces: Sciaenidae

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    Alcira O. Diaz

    2005-12-01

    Full Text Available This study examines the mucous cells from the gills of the stripped weakfish Cynoscion guatucupa. The glycoconjugates (GCs were identified with: (1 oxidizable vicinal diols; (2 sialic acids and some of their chain variants, C7, C8 or C9; (3 sialic acid residues with O-acyl substitution at C7, C8 or C9; (4 carboxyl groups and (5 sulphate groups. The presence of sugar residues in the oligosaccharide side chain of glycoconjugates was investigated by means of a battery of seven biotinylated lectins. One type of mucous cell was identified in the primary and secondary lamellae, the secretory content of which evidenced neutral, sulphated and sialylated glycoconjugates. The distribution pattern of the mucus was identical in the primary and secondary lamellae. PNA had the most staining in the mucous cell content, while UEA-I had the least, as it was completely negative. Con-A showed weak to no staining and WGA showed weak to moderate staining. The reactions to DBA, SBA and RCA-I were moderate. This work clearly demonstrates the heterogeneity of the mucous cell glycoconjugates, which could be involved in various functions, such as lubrication, protection, inhibition of microorganisms and a role in ion regulation and diffusion.

  10. The PISC III programme: 1989 status report

    International Nuclear Information System (INIS)

    Crutzen, S.; Jehenson, P.; McDonald, N.

    1990-01-01

    The PISC Programme has the general objective of assessing procedures and techniques in use for the inspection of pressure components (in particular the vessel and piping). The Series of projects for the Inspection of Steel Components carried out since 1974 under the auspices of the CEC/JRC and the OECD/NEA is a major international effort to better assess the capability and reliability of Non Destructive Inspection procedures on structural components. The programme is now in its third phase (PISC III project); the activities are concentrated on the validation of the PISC II results (e.g. modification of the ASME Inspection Codes) on real structures containing real service defects and the extension of the PISC methodology on most important structural components made of different materials. Most of the PISC test assemblies and structure pieces are representative of (or are coming from) nuclear reactor components. (author)

  11. The steam generator programme of PISC III

    International Nuclear Information System (INIS)

    Birac, C.; Herkenrath, H.

    1990-12-01

    The PISC III Actions are intended to extend the results and methodologies of the previous PISC excercises, i.e. the validation of the capabilities of the various examination techniques when used on real defects in real components under real conditions of inspection. Being aware of the important safety role that steam generator tubes play as barrier between primary and secondary cooling system and of the industrial problems that the degradation of these tubes can create, the PISC III Management Board agreed to include in the PISC III Programme a special Action on Steam Generator Tubes Testing (SGT). It was decided to organize the programme in three phases, including Round Robin Tests (RRT): - capability tests on loose tubes, - capability tests on transportable mock-ups, - reliability tests on fixed mock-ups including some interesting SURRY tubes

  12. Cephalopods in the diets of four shark species ( galeocerdo Cuvier ...

    African Journals Online (AJOL)

    The cephalopod components of the diets of four species of shark, tiger Galeocerdo cuvier, smooth hammerhead Sphyrna zygaena, scalloped hammerhead S. lewini and great hammerhead S. mokarran, were examined to reveal patterns of prey choice. Although these sharks were caught in the inshore gillnets used in ...

  13. Latitudinal variation in Atlantic Salpa fusiformis Cuvier, 1804 (Tunicata, Thaliacea)

    NARCIS (Netherlands)

    Soest, van R.W.M.

    1972-01-01

    The existence of clinal variation in some morphological characters of Atlantic Salpa fusiformis Cuvier, 1804, is reported. The number of muscle fibres of both aggregate and solitary individuals is subjected to a decrease from higher to lower latitudes. Size and reproduction also seem to vary

  14. Food and Feeding Habits of Catfish (Synodontis nigrita Cuvier And ...

    African Journals Online (AJOL)

    acer

    ABSTRACT:The food and feeding habits of Synodontis nigrita (Cuvier and Valenciennes) from. River Rima were ... (2005) studied the food habits of. Synodontis ... Phytoplankton families, Chlorophyceae and ... with r values of almost 1 in all the regression equations. ... often influences gut length (Smith, 1980). Perhaps the ...

  15. An introduction to the PISC II project - programme for the inspection of steel components

    International Nuclear Information System (INIS)

    Nichols, R.; McDonald, N.R.

    1987-01-01

    The paper describes the work of the Plate Inspection Steering Committee (PISC) on the non-destructive examination of reactor pressure vessel steels. A description is given of the PISC I exercise on flaw measurements in test plates, including the PISC procedure and the alternative procedures in the PISC I exercise. The motivation for a PISC II programme is described, together with the objectives and terms of reference of PISC II. (U.K.)

  16. Los taxones como tipos: Buffon, Cuvier y Lamarck Taxa as types: Buffon, Cuvier and Lamarck

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    Gustavo Caponi

    2011-03-01

    Full Text Available Darwinianamente, los grupos taxonómicos son entendidos como entidades históricas que surgen en un momento de la evolución y que siempre pueden desaparecer. Pero esos grupos también fueron entendidos por muchos naturalistas como clases naturales; es decir, como tipos permanentes, a-históricos. Es mi interés señalar algunas de las formas que ese pensamiento tipológico de hecho ha tomado, subrayando que la adopción de esa perspectiva tipológica, además de no responder a compromisos teológicos, tampoco tiene porqué obedecer a la adopción de una ontología que pueda estar en conflicto con la ciencia natural. Analizaré así el modo en el que Buffon entendió las especies y el modo en los que Cuvier y Lamarck entendieron los órdenes taxonómicos superiores.From a Darwinian point of view, taxonomic groups are understood as historical entities that arise at an evolutionary moment and that can always disappear. But these groups were also understood by many naturalists as natural kinds; in other words, as permanent, ahistorical types. I will explore some of the forms that this typological thought took, showing that this typological perspective neither depends on theological beliefs, nor obeys the adoption of an ontology that might contradict natural science. Thus I shall analyze Buffon's understanding of species and the ways in which Cuvier and Lamarck understood the higher taxonomic orders.

  17. A description of the PISC project

    International Nuclear Information System (INIS)

    1979-01-01

    This report, written as an historical review of the Plate Inspection Steering Committee project, records the background of the project and refers in general to the reasons why decisions were made during the four years the project has been running. Details are given in further reports, of which the full list, issued by the Commission of the European Communities, is as follows: Report no.1 - A description of the PISC project. Report no.2 - Ultrasonic examination of the PVRC plates nos. 50/52, 51/53 and 204. Report no.3 - Destructive examination of the PVRC plates nos. 50/52, 51/53 and 204. Report no.4 - Analysis scheme of the PISC trials results. Report no.5 - Evaluation of the PISC trials results. A list of all participants is given. Data and results of the test programme are detailed in the other reports above, but to maintain confidentiality of data the individual teams have been allocated a code number known only to the team and the PISC management. Data are only identified against code numbers. A report on conclusions and recommendations of the whole PISC programme will be published by the OECD-Committee on the Safety of Nuclear Installations (CSNI) and presented at its annual meeting 1979

  18. Evaluation of the PISC trials results

    International Nuclear Information System (INIS)

    1979-01-01

    This report gives the results of the analysis carried out in the manner described in PISC report no.4, to compare the defects indicated by ultrasonic examination with those discovered by a destructive examination. The analysis was repeated three times; once for ultrasonic examination using the PISC procedure but with as much as possible subjective interpretation from the teams removed, once for ultrasonic examination using the PISC procedure incorporating the subjective interpretation of the teams, and once for ultrasonic examination using a variety of alternative techniques. Results are given in the form of tables and figures for each reference defect (i.e. those found by the destructive examination) in turn. Correlations, when they exist, are presented between the parameters describing the performance of the ultrasonic examination procedures and the parameters describing the reference defects. From the global set of results conclusions are drawn concerning the efficiency of the ultrasonic procedures for detecting, sizing, locating and correct rejection of defects

  19. PISCES: A Tool for Predicting Software Testability

    Science.gov (United States)

    Voas, Jeffrey M.; Miller, Keith W.; Payne, Jeffery E.

    1991-01-01

    Before a program can fail, a software fault must be executed, that execution must alter the data state, and the incorrect data state must propagate to a state that results directly in an incorrect output. This paper describes a tool called PISCES (developed by Reliable Software Technologies Corporation) for predicting the probability that faults in a particular program location will accomplish all three of these steps causing program failure. PISCES is a tool that is used during software verification and validation to predict a program's testability.

  20. Analysis of the PISC II trials results

    International Nuclear Information System (INIS)

    Haines, N.

    1988-01-01

    The paper presents the analysis scheme of the Programme for the Inspection of Steel Components PISC II trial results. The objective of the PISC II exercise is to evaluate the effectiveness of current and advanced NDT techniques for inspection of reactor pressure vessel components. The analysis scheme takes data from the Round Robin Trial (RRT) and Destructive Examination, then reduces it to a manageable form in order to present useful conclusions on the effectiveness of NDT. A description is given of the data provided by RRT, the data analysis scheme, the definition of analysis parameters, and the main methods of data presentation. (U.K.)

  1. Life history of the steentjie Spondyliosoma emarginatum (Cuvier ...

    African Journals Online (AJOL)

    Morphometric measurements and fin spine and ray counts, external colouration, macroscopic gonad stage and diet were recorded for steentjie Spondyliosoma emarginatum (Pisces: Sparidae) collected from Langebaan Lagoon between August 2004 and September 2005. Sagittal otoliths were removed, and age estimates ...

  2. Design of the PISCES-Upgrade facility

    International Nuclear Information System (INIS)

    Waganer, L.M.; Doerner, R.

    1994-01-01

    The PISCES-Upgrade facility is currently in the design and fabrication phases for the University of California. McDonnell Douglas is under contract to develop this experimental facility in order to enhance the capability for investigation of fusion materials erosion-redeposition and edge plasma behaviors. The advance in facility capability requires innovative design approaches and application of sophisticated analysis techniques

  3. Pisces

    Science.gov (United States)

    Murdin, P.

    2000-11-01

    (the Fishes; abbrev. Psc, gen. Piscium; area 889 sq. deg.) A northern zodiacal constellation which lies between Pegasus and Cetus, and culminates at midnight in late September. Its origin dates back to Babylonian times and it is said to represent Aphrodite, the goddess of love in Greek mythology, and her son Eros, who jumped into the Euphrates to escape from the multi-headed Typhon and were turned...

  4. Third programme for the inspection of steel components (PISC III): an introduction

    International Nuclear Information System (INIS)

    Crutzen, S.

    1988-01-01

    The purpose of the Third Programme for the Inspection of Steel Components PISC III is to amplify, verify and validate aspects revealed by the PISC II work. To do this the programme is to consider real defects, real geometries in real surroundings, and complementary laboratory exercises and validation of mathematical models. A description is given of the motivation and objectives of PISC III, terms of reference for PISC III and the programme for PISC III. (U.K.)

  5. PISC II: Parametric studies. Monitoring of PISC-II parametric studies in ultrasonic NDT for PWR

    International Nuclear Information System (INIS)

    Toft, M.W.

    1989-09-01

    The CEGB NDT Applications Centre is partipating in the EEC-funded international Programme for the Inspection of Steel Components (PISC) on account of its relevance to the inspection of Sizewell B and future PWRs. This report describes an inspection monitoring exercise undertaken by NDTAC under partial funding from JRC Ispra, at the initiation of the PISC-III Ultrasonic Modelling Group. Experimental studies have been carried out under PISC-II to investigate ultrasonic defect response as a function of various parameters which characterise the inspection situation. Some of these parametric studies are potentially useful for the validation of theoretical models of ultrasonic inspection and are consequently relevant to the work of the PISC-III Modelling Group. The aim of the present exercise was to ensure that data obtained by the various contract organizations participating in the PISC-II Parametric Studies was of high quality, was a complete record of the inspection and would yield valid comparisons with the predictions of theoretical models. The exercise entailed visits by a nominated CEGB observer to 4 European NDT Laboratories at which the parametric studies were in progress; CISE (Milan); UKAEA (Harwell); UKAEA (Risley) and Vincotte (Brussels). This report presents the findings of those visits

  6. PisCES: Pis(cine) Community Estimation Software

    Science.gov (United States)

    PisCES predicts a fish community for any NHD-Plus stream reach in the conterminous United States. PisCES utilizes HUC-based distributional information for over 1,000 nature and non-native species obtained from NatureServe, the USGS, and Peterson Field Guide to Freshwater Fishes o...

  7. Evaluation of the PISC-2 trials results PISC 2 report No.5. Final issue

    International Nuclear Information System (INIS)

    1986-09-01

    Ultrasonic testing is widely used for detecting, locating and sizing flaws in primary circuit elements at various stages of plant life. The successive PISC projects have constituted the most notable, sustained, international effort to assess the effectiveness of these inspection techniques. The Programme for the Inspection of Steel Components (PISC-II, 1981-1986) constitutes a detailed evaluation of the best performance obtainable by modern ultrasonic techniques under optimal conditions. The present report gives a complete evaluation of the results of PISC-II obtained on various plates presenting different types of defects. Three levels of evaluation are considered: a comparison between teams, a comparison between procedures, and a comparison of the individual techniques and components of the procedures. Results are discussed as a function of the tolerance on sizing, as a function of subgroups of defects (defect position, size, characteristics)

  8. PISC II: parametric studies. The purpose of the PISC II parametric studies programme

    International Nuclear Information System (INIS)

    Crutzen, S.

    1989-09-01

    The results of the PISC I round robin test of the ASME type procedure showed a very large dispersion. The amplitude of response of all defects varied very much among the teams from the 27 laboratories considered for the evaluation of results. Scatter on detection and sizing in PISC I was such that discussions started on the reasons for such a phenomenon when exactly the same procedure was used by all teams. The observation of two teams' results (JRC Ispra and ENEL Piacenza, Italy) induced the NDE Ispra laboratories to insist on the possible importance of equipment characteristics. All PISC members insisted on specific studies of the influence of defect characteristics as well as the role of cladding. These three chapters were the leading PIS laboratory exercises called Parametric Studies

  9. German NDE within PISC-II program

    International Nuclear Information System (INIS)

    Deuster, G.; Schmuelling, W.

    1987-01-01

    Within PISC-I, which was finished at the end of the seventies, three uncladded 200 mm thick plates were available. In this program ten European countries were participating. The test specimens came out of the American HSST-program. A series of testing according to the ASME-procedure were performed and in addition several alternative techniques. The manufacturing defects dominated but were unrealistic large. There was a lack of small cracklike defects. The PISC-II program was initiated in the early eighties with participation of twelve European countries and in addition USA, Japan and Canada. A lot of realistic service induced cracklike defects were available especially what concerned their position and size. (orig.)

  10. Complete mitochondrial genome of the tiger shark Galeocerdo cuvier (Carcharhiniformes: Carcharhinidae).

    Science.gov (United States)

    Chen, Xiao; Yu, Junqi; Zhang, Saile; Ding, Wenyong; Xiang, Dan

    2014-12-01

    The tiger shark Galeocerdo cuvier is the only member of the genus Galeocerdo. The complete mitochondrial genome of G. cuvier is presented for the first time in this study. The gene composition and arrangement in the mitogenome of G. cuvier is identical to most animal mitogenome. There are 22 bp short noncoding sequences and 44 bp overlaps in the mitogenome. The overall base composition is 31.8% A, 23.9% C, 13.0% G and 31.3% T. The dihydrouridine arm of tRNA-Ser2 was replaced by a simple loop and the other tRNAs could be folded into the typical cloverleaf structure.

  11. Diet and trophic ecology of the tiger shark (Galeocerdo cuvier from South African waters.

    Directory of Open Access Journals (Sweden)

    Matthew L Dicken

    Full Text Available Knowledge of the diet and trophic ecology of apex predators is key for the implementation of effective ecosystem as well as species-based management initiatives. Using a combination of stomach content data and stable isotope analysis (δ15N and δ13C the current study provides information on size-based and sex-specific variations in diet, trophic position (TP and foraging habitat of tiger sharks (Galeocerdo cuvier caught in the KwaZulu-Natal Sharks Board bather protection program. This study presents the longest time-series and most detailed analysis of stomach content data for G. cuvier worldwide. Prey identified from 628 non-empty stomachs revealed a size-based shift in diet. Reptiles, birds, mysticetes, and large shark species increased in dietary importance with G. cuvier size, concomitant with a decrease in smaller prey such as batoids and teleosts. Seasonal and decadal shifts in diet driven primarily by changes in the importance of elasmobranchs and mammal (cetacean prey were recorded for medium sized (150-220 cm G. cuvier. Both stomach content and stable isotope analysis indicated that G. cuvier is a generalist feeder at the population level. Size-based δ13C profiles indicated a movement to offshore foraging habitats by larger G. cuvier. Calculated TP varied by method ranging from 4.0 to 5.0 (TPSCA for stomach contents and from 3.6 to 4.5 (TPscaled and TPadditive for δ15N. Large (> 220 cm G. cuvier did not feed at discrete trophic levels, but rather throughout the food web. These data provide key information on the ecological role of G. cuvier to improve the accuracy of regional food web modelling. This will enable a better understanding of the ecological impacts related to changes in the abundance of this predator.

  12. Round robin tests of the PISC III programme on defective steam generators tubes

    International Nuclear Information System (INIS)

    Birac, C.; Herkenrath, H.; Crutzen, S.; Miyake, Y.; Maciga, G.

    1991-11-01

    The PISC III actions are intended to extend the results and methodologies of the previous PISC exercises, i.e. the assessment of the capabilities of the various examination techniques when used on real or realistic flaws in real components under real conditions of inspection. Being aware of the industrial problems that the degradation of steam generator tubes can create, the PISC III management board decided to include in the PISC III programme a special action on steam generator tubes testing (SGT). (author)

  13. NOAA Ship Pisces Underway Meteorological Data, Quality Controlled

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA Ship Pisces Underway Meteorological Data (delayed ~10 days for quality control) are from the Shipboard Automated Meteorological and Oceanographic System (SAMOS)...

  14. NOAA Ship Pisces Underway Meteorological Data, Near Real Time

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA Ship Pisces Underway Meteorological Data (Near Real Time, updated daily) are from the Shipboard Automated Meteorological and Oceanographic System (SAMOS)...

  15. PISCES and ALT-II: Juelich PSI papers

    International Nuclear Information System (INIS)

    Conn, R.W.; Hirooka, Y.; LaBombard, B.

    1988-08-01

    This publication comprises papers from the PISCES and ALT-II Programs at UCLA which were presented at the International Plasma Surface Interactions Meeting held in Juelich, FRG, on May 2-6, 1988. A list of publications from the PISCES and ALT-II contained in this report are: Deuterium pumping and erosion behavior of selected graphite materials under high flux plasma bombardment in PISCES; Erosion and redeposition behavior of selected NET-candidate materials under high-flux hydrogen, deuterium plasma bombardment in PISCES; Presheath profiles in simulated tokamak edge plasmas; Boundary asymmetries and plasma flow to the ALT-II toroidal belt pump limiter; ALT-II toroidal belt pump limiter performance in TEXTOR; and An in-situ spectroscopic erosion yield measurement with applications to sputtering and surface morphology alterations

  16. NOAA Ship Pisces Cruise PC1106 (14) Multibeam Sonar Workshop

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The overall objective is to familiarize participating scientists with PISCES multibeam echosounder (Simrad ME70) configuration, operation, calibration and data...

  17. From PISC to risk informed inspection

    International Nuclear Information System (INIS)

    Crutzen, S.; Lemaitre, P.; Fabbri, L.

    1998-01-01

    In this paper the correlation between inspection effectiveness, inspection qualification and risk informed inspection will be treated in view of harmonisation of inspection of nuclear plant components. Through the different phases of the PISC programme the necessity has been demonstrated to show the effectiveness of the inspection through a formal process of qualification in order to ensure that a certain level of effectiveness has been reached. Inspection qualification is indeed the way to quantify the capability level of inspection techniques used. The targets to be met by the inspection is information which should be obtained from risk based analyses. (author)

  18. PISCES Program: Summary of research, 1988

    International Nuclear Information System (INIS)

    1988-10-01

    This paper discusses the research of the PISCES Program. Topics discussed are: deuterium pumping by C-C composites and graphites; reduced particle recycling from grooved graphite surfaces; surface analysis of graphite tiles exposed in tokamaks; erosion behavior of redeposition layers from tokamaks (tokamakium); high temperature erosion of graphite; collaboration on TFTR probe measurements of implanted D; spectroscopic studies of carbon containing molecules; presheath profile measurements; biased limiter/divertor experiments; particle transport in the CCT tokamak edge plasma; and experimental studies of biased divertors and limiters. 26 refs., 23 figs

  19. NOAA Ship Pisces Cruise PC-11-06 (14) Multibeam Sonar Workshop on NOAA Ship Pisces (EK60)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The overall objective is to familiarize participating scientists with PISCES multibeam echosounder (Simrad ME70) configuration, operation, calibration and data...

  20. NOAA Ship Pisces Cruise PC-11-06 (14) Multibeam Sonar Workshop on NOAA Ship Pisces (ME70)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The overall objective is to familiarize participating scientists with PISCES multibeam echosounder (Simrad ME70) configuration, operation, calibration and data...

  1. Biometric observations of newborn Crocodylus acutus (Cuvier, 1807 obtained in captivity in, Tumbes, Peru

    Directory of Open Access Journals (Sweden)

    Oswaldo Pérez

    2013-05-01

    Full Text Available In this paper, length and weigth measurements of 20 newborn Crocodylus acutus (Cuvier, 1807 hached in a pilot farm-bred of the aquaculture center La Tuna Carranza, Puerto Pizarro, Tumbes, Peru, in 2001 are presented. The information is compared with similar reports from others places.

  2. A Summary of the PISC-2 project PISC 2 report N. 1. Final issue

    International Nuclear Information System (INIS)

    1986-09-01

    PISC II, the second stage of the Programme for the Inspection of Steel Components, was set up in 1980 to examine non-destructive techniques that could provide the desired level of capability for detection and sizing of defects to assure the integrity of critical structures such as pressure vessels. The objectives of the PISC-II programme, which comprises an experimental, round-robin test phase, are: to evaluate the effectiveness of NDT techniques either in use or being developed for the inspection of reactor pressure vessel components, with regard mainly to detecting and characterising service-induced flaws; to identify techniques for acceptance tests, pre-service inspection (PSI) and in-service inspection (ISI) which could be generally accepted; to bring the conclusions of the programme to the attention of the Code, Standard and Regulatory Bodies concerned with ISI. Performance of individual techniques, both manual and mechanized, is discussed and various types of defects considered. Conclusions are drawn on the detection and sizing capabilities of these techniques for each defect type

  3. Analysis scheme of the PISC trials results

    International Nuclear Information System (INIS)

    1979-01-01

    The primary aim of the evaluation is to fulfil the requirements of the terms of reference of the PISC programme, i.e. 'To determine the capability of the US 1974 procedure for ultrasonic examination techniques to detect flaws or discontinuities, their size, orientation and location in heavy section steel'. The evaluation is therefore concerned directly with comparing the NDE results of the individual teams with the results of the destructive examination which has determined the location, size and orientation of the actual flaws present in the test plates. This report describes the method which has been evolved for the comparison between the results of the NDE and those of the destructive examination. The parameters used to quantify the results of the comparison were chosen to reflect: the probability of detection of a defect, the error in or quality of sizing of a defect, the error in or quality of location of a defect, the quality of or probability of correct rejection or acceptance based on a symbolic application of the defect rejection rules of the ASME Code, Section XI (1974)

  4. H I observations of two new dwarf galaxies: Pisces A and B with the SKA Pathfinder KAT-7

    NARCIS (Netherlands)

    Carignan, C.; Libert, Y.; Lucero, D. M.; Randriamampandry, T. H.; Jarrett, T. H.; Oosterloo, T. A.; Tollerud, E. J.

    2016-01-01

    Context. Pisces A and Pisces B are the only two galaxies found via optical imaging and spectroscopy out of 22 Hi clouds identified in the GALFAHI survey as dwarf galaxy candidates. Aims: We derive the Hi content and kinematics of Pisces A and B. Methods: Our aperture synthesis Hi observations used

  5. Aquarius-Pisces Constellation Boundary Update

    Science.gov (United States)

    Durst, Steve

    2017-06-01

    Observation, mapping and study of Galaxy Stars has provided humanity direction, foundation, clarity and understanding through the ages.Human civilization advances itself using increasing intelligence and knowledge to develop tools and know how, the science of constellation star maps included: All that has been created by humanity, is to serve humanity.When people continue to use constellation star maps that no longer serve people effectively, the maps are updated, as is now the Aquarius-Pisces Constellation Boundary Update (APCBU), which marks 2000 as the year the Sun is in Aquarius at the vernal equinox.The 21st Century APCBU accounts for and incorporates science factors of precession, relativity and galacticity for professional astronomers, and social imperatives of increasing freedom, liberation and egalitarian culture for the 7.5 billion people of Earth.Twenty years into this first century of a new millennium and a new age is an effective time for an APCBU of such elegant simplicity that it changes less than 0.1% of the area of the IAU 1930 official constellation map, which marks 2597 about the year the Sun is in Aquarius at the time of the vernal equinox.The 21st Century APCBU results provide clarity and direction for humanity's next 2,000 years, if not 10,000 or 12,000 years, and advance the official astronomy / science start of the Aquarius Age -- long anticipated, desired, and imperative, especially in America -- by some 600 years.How much attention is increasingly focused on this region of the sky -- such as the recent discovery of 7 Earth-like worlds orbiting the Trappist-1 star in the Aquarius constellation -- will be an epochal 21st Century phenomenon of human science, society, and starlife.

  6. Comparison of steam generator methods in PISC

    International Nuclear Information System (INIS)

    Lahdenperae, K.; Kankare, M.

    1996-01-01

    The main objective of the study (PISC III, action 5) was the experimental evaluation of the performance of methods used in in-service inspection of steam generator tubes used in nuclear power plants. The study was organized by the Joint Research Center of the European Community (JRC). The round robin test with blind boxes started in 1991. During the study training boxes and blind boxes were circulated in 29 laboratories in Europe, Japan and the USA. The boxes contained steam generator tubes with artificial and natural (chemically induced) flaws. The material was inconell. The blind boxes contained 66 tubes and 95 flaws. All flaws were introduced into different discontinuities, under support plates, above the tube sheet and into U-bends. The flaws included volumetric flaws (wastage, pitting, wear), axial and circumferential notches and chemically induced SCC cracks and IGA. After the round robin test the reference laboratory performed the destructive examination of reported flaws. The flaw detection probability (FDP) for all flaws and for teams inspecting all tubes was 60-85%. The detection of flaws deeper than 40% of the wall thickness was good. Flaws with a depth of less than 20% were not detected. When all flaws were considered, depth sizing was found to have a wide dispersion. Similarly, measured lengths did not as a rule correlate with true lengths. The classification of flaws in cracks and of volumetric flaws was not very successful, the correct classification probability being only about 70%. Evaluation of the flaws showed some shortcomings. The correct rejection probability was at best 83% for teams inspecting all boxes. (3 refs.)

  7. Population structure and connectivity of tiger sharks (Galeocerdo cuvier) across the Indo-Pacific Ocean basin.

    Science.gov (United States)

    Holmes, Bonnie J; Williams, Samuel M; Otway, Nicholas M; Nielsen, Einar E; Maher, Safia L; Bennett, Mike B; Ovenden, Jennifer R

    2017-07-01

    Population genetic structure using nine polymorphic nuclear microsatellite loci was assessed for the tiger shark ( Galeocerdo cuvier ) at seven locations across the Indo-Pacific, and one location in the southern Atlantic. Genetic analyses revealed considerable genetic structuring ( F ST  > 0.14, p  Indo-Pacific locations and Brazil. By contrast, no significant genetic differences were observed between locations from within the Pacific or Indian Oceans, identifying an apparent large, single Indo-Pacific population. A lack of differentiation between tiger sharks sampled in Hawaii and other Indo-Pacific locations identified herein is in contrast to an earlier global tiger shark nDNA study. The results of our power analysis provide evidence to suggest that the larger sample sizes used here negated any weak population subdivision observed previously. These results further highlight the need for cross-jurisdictional efforts to manage the sustainable exploitation of large migratory sharks like G. cuvier .

  8. Necrophagy of a nurse shark (Ginglymostoma cirratum) by tiger sharks (Galeocerdo cuvier)

    OpenAIRE

    Rada, Danilo P; Programa de Pós Graduação em Ciências Biológicas, CCEN, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil; Burgess, George H; Florida Museum of Natural History University of Florida, Gainesville, Florida, U.S.A.; Rosa, Ricardo S; Departamento de Sistemática e Ecologia, CCEN, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil.; Gadig, Otto F; Laboratório de Pesquisa em Elasmobrânquios e Nécton Marinho, UNESP, São Vicente, São Paulo, Brazil.

    2015-01-01

    The aim of this study is to report a scavenging event, involving the consumption of a nurse shark, Ginglymostoma cirratum, by tiger sharks, Galeocerdo cuvier, at Fernando de Noronha archipelago, Brazil. Recreational divers found and photographed a bitten nurse shark carcass, just after sighting two tiger sharks near of the site. We estimated the sharks total lengths and discussed aspects of this feeding interaction using of images of forensic analysis. A straight cut on the nurse shark caudal...

  9. Population Parameters of Blainville’s and Cuvier’s Beaked Whales

    Science.gov (United States)

    2014-09-30

    waters, they are usually difficult to study. El Hierro (Canary Islands) holds resident populations of Blainville’s and Cuvier’s beaked whales in...surveys off El Hierro , according to plan. Four of these cruises took place since the last report in September 2013, summing 38 days of fieldwork performed...marks as to be individually recognizable. 3 Publication of results of the ONR funded cetacean research in El Hierro in 2014 Peer reviewed

  10. Preliminary results on the Arecibo Pisces-Perseus Supercluster Survey

    Science.gov (United States)

    Cortes, Rosemary; Lebron, Mayra; Jones, Michael G.; Koopmann, Rebecca A.; Haynes, Martha P.; APPSS Team, Undergraduate ALFALFA Team, and the ALFALFA Team

    2018-01-01

    The Arecibo Pisces-Perseus Supercluster Survey (APPSS) aims to exploit the Baryonic Tully-Fisher Relation to derive distances and peculiar velocities of galaxies in and near the main ridge of the Pisces-Perseus Supercluster (PPS), one of the most prominent features of the Cosmic Web in the nearby Universe. The sample of galaxies contains ~ 600 sources in the low-mass range (8 Team institutions in which each group contributes to the analysis of a subset of the HI PPS data. In this poster, we will present the contributions of the U.P.R. team to the APPSS project. We will show the procedure used for the Arecibo HI data analysis, including some examples, and will show our preliminary results.

  11. Arecibo Pisces-Perseus Supercluster Survey: Declination Strip 25

    Science.gov (United States)

    Agostino, James; Harrison, Matthew F.; Finn, Rose, Dr.; APPSS Team, Undergraduate ALFALFA Team, ALFALFA Team

    2018-01-01

    The Arecibo Pisces-Perseus Supercluster Survey (APPSS) is an observing project by the Undergraduate ALFALFA Team, aimed at determining the mass of the Pisces Perseus Supercluster through measurement of peculiar velocities from HI line detections. The survey targeted approximately 600 galaxies selected based on SDSS and GALEX photometry as likely to contain HI. We reduced Arecibo L-Band Wide observations for 90 galaxies near declination 25 degrees, 40 of which showed HI emission. 58% of those 40 galaxies were below 10,000 km/s recession velocity and thus will provide useful information to draw conclusions from. We determined the recession velocity, velocity width, and HI line flux for each detection. We discuss our results for APPSS galaxies and for ALFALFA detections near this declination strip. By combining results from all strips, APPSS will determine which galaxies are associated with the Pisces-Perseus Supercluster, and their peculiar velocities will be measured via the baryonic Tully-Fisher relation. This work has been supported by NSF grants AST-1211005 and AST-1637339.

  12. PISC II: Parametric studies. Summary of the PISC II Parametric studies on the Effect of defect Characteristics (EDC)

    International Nuclear Information System (INIS)

    Crutzen, S.; Murgatroyd, R.; Dombret, P.

    1989-09-01

    Studies on the effect of defect characteristics and selected inspection parameters on the detection and sizing of defects in ferritic steel blocks have been performed by: - United Kingdom Atomic Energy Authority (UKAEA, Risley and Harwell), - CISE, (Italy, Milan), - VINCOTTE (Belgium, Brussels), - CEC, JRC (Ispra Site; complementary measurements), as part of a larger Commission of the European Communities (CEC) programme in support to the PISC (Programme for the Inspection of Steel Components), jointly sponsored by OECD (Organization for Economic Coordination and Development) and CEC and operated by the Joint Research Centre (JRC), Ispra Establishment. The purpose of the programme was to acquire reliable experimental data that could be used both to explain results of the PISC I and II Round Robin Tests (RRT) and to test and validate theoretical models of the ultrasonic testing techniques. For these studies, eighteen test blocks were manufactured by JRC Ispra, Operating Agent and Reference Laboratory of PISC. A range of defect types was inserted with great care covering aspects such as defect shape, defect size, defect surface roughness, defect position in depth, defect orientation. Several of these blocks (defects) were selected by the participating institutions. Each of these participants applied well specified usual ultrasonic techniques: echo techniques, tandem technique, focusing probe technique at 45 0 and time of flight diffraction (TOFD). Results of such measurements propose clear correlation between defect characteristics and amplitude of response of these defects

  13. Population dynamics of the yellowstripe scad (Selaroides leptolepis Cuvier, 1833) and Indian mackerel (Rastrelliger kanagurta Cuvier, 1816) in the Wondama Bay Water, Indonesia

    Science.gov (United States)

    Sala, R.; Bawole, R.; Runtuboi, F.; Mudjirahayu; Wopi, I. A.; Budisetiawan, J.; Irwanto

    2018-03-01

    The Wondama Bay water is located within the Cendrawasih Bay National Park and is potential for fishery resources, including pelagic fish such as yellowstripe scad (Selaroides leptolepis Cuvier, 1833) and Indian mackerel (Rastrelliger kanagurta Cuvier, 1816). Yet, information about the population dynamics of these species in the region is unknown until today. Meanwhile, the fishing activities have been quite intensive and include the dominant catches over the last ten years by traditional fishermen fishing using liftnets. Therefore, this study aims to determine some of specific characteristics of the population dynamics and fish utilization status of scad and mackerel in the waters of the Wondama Bay. Data used in this study were taken from direct observation of catch of liftnet fishery. The data then were analysed by using FISAT II to estimate the growth parameters, mortality rates, and yield per recruitment. The results showed that yellowstripe scad has the positive allometric growth, while Indian mackerel followed isometric growth. Models of fish growth were L(t) = 22 (1-e-3.0(t-0.05)) for yellowstripe scad and L(t) = 27.8 (1-e-4.0(t-0.04)) for Indian mackerel. The natural mortality (M) of 4.19 year-1, fishing mortality (F) of 5.01 year-1, and total mortality (Z) of 9.20 year-1 were for yellowstripe scad, and M of 4.74 year-1, F of 2.52 year-1 and Z of 7.26 year-1 were for Indian mackerel. Based on the mortality rates, estimated exploitation rate for the yellowatripe scad was 54 % and the Indian mackerel was 35 %. To increase the production of catch without increasing fishing effort (fishing mortality) can be done by increasing the size of fish caught or the Lc/L∞ should be greater than 0.5.

  14. Extracting DNA from 'jaws': High yield and quality from archived tiger shark (Galeocerdo cuvier) skeletal material

    DEFF Research Database (Denmark)

    Eg Nielsen, Einar; Morgan, J. A T; Maher, S. L.

    2017-01-01

    of tiger sharks (Galeocerdo cuvier). Protocols were compared for DNA yield and quality using a qPCR approach. For jaw swarf, all methods provided relatively high DNA yield and quality, while large differences in yield between protocols were observed for vertebrae. Similar results were obtained from samples...... observed, likely reflecting different preparation and storage methods for the trophies. Trial sequencing of DNA capture genomic libraries using 20 000 baits revealed that a significant proportion of captured sequences were derived from tiger sharks. This study demonstrates that archived shark jaws...

  15. Hystological analysis of ovarian development of the characiform Oligosarcus hepsetus (Cuvier, 1829 in a Brazilizn Reservoir

    Directory of Open Access Journals (Sweden)

    R. N Santos

    Full Text Available A histological analysis was performed of the ovarian development of Oligosarcus hepsetus (Cuvier, 1829, a medium-sized carnivorous Characiform species in the Lajes reservoir, Brazil. A total of 125 fishes, collected monthly between April 2001 and June 2002 were examined by routine macroscopic and histological techniques. Eight phases of the oocyte development were described, and 4 stages and 4 sub-stages of gonadal development were proposed. Spawning in reservoirs, similarly to that in rivers, is in batches, which favors juvenile survival and suggests that the impoundment of this area did not influence the reproductive strategy of this very successful species in a dammed environment.

  16. The major results of the PISC II Round Robin test

    International Nuclear Information System (INIS)

    Crutzen, S.

    1987-01-01

    The objectives of the PISC-II programme were: - To evaluate the effectiveness of NDT techniques either in use or being developed for the inspection of reactor pressure vessel components, with regard mainly to detecting and charaterising service-induced flaws. - To identify techniques for acceptance tests, pre-service inspection (PSI) and in-service inspection (ISI) which could be generally accepted, and - to bring the conclusions of the programme to the attention of the Code, Standard and Regulatory Bodies concerned with ISI. (orig./HP)

  17. Coupling of the PISCES device modeler to a 3-D Maxwell FDTD solver

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, V.A.; Jones, M.E.; Mason, R.J. [Los Alamos National Lab., NM (United States)

    1995-09-01

    The authors show how PISCES-like semiconductor models can be joined non-invasively to finite difference time domain models for the calculation of coupled external electromagnetics. The method involves tricking the standard current boundary condition for the device model into accepting an effective parallel external capacitance. For nearly steady state device conditions the authors show the results for a transmission line-coupled PISCES diode to agree well with those for an ideal diode.

  18. Ultrasonic inspection of heavy section steel components: the PISC II final report

    International Nuclear Information System (INIS)

    Nichols, R.W.; Crutzen, S.

    1988-01-01

    This Symposium represented the end of the PISC (Programme for Inspection of Steel Components), II Round Robin Test Project, and the book is the final report. The contents are divided into three parts: part 1 contains contributions from the PISC Management Group, part II contains individual contributions, part III contains views of Licensing Authorities. All the twenty three papers presented in the three parts are selected for INIS and indexed separately. (author)

  19. The Arecibo Pisces Perseus Supercluster Survey: Declination Strip 27

    Science.gov (United States)

    Ricci, Mariah; Miller, Brendan; APPSS Team; Undergraduate ALFALFA Team; ALFALFA Team

    2018-01-01

    The Arecibo Pisces Perseus Supercluster Survey (APPSS) is an HI survey measuring galaxy infall into the filament and clusters. Galaxies were selected for HI observations based on their location within the Pisces Perseus supercluster and SDSS and GALEX colors predictive of cold gas content. Most of the HI observations were conducted at Arecibo using the L Band Wide receiver, with some high-declination coverage provided by Green Bank. The observations provide increased sensitivity compared to ALFALFA blind survey data. For this project, we investigated a subset of 132 APPSS galaxies with declinations near 27 degrees. Using custom data reduction and analysis tools developed for the Undergraduate ALFALFA Team, we determined the following information for galaxies in our subset: systemic velocity, line width, integrated flux density, HI mass, and gas fraction (or corresponding limits for non-detections). We calculate our HI detection fraction and mean gas fraction as a function of stellar mass and compare to previous results. We investigate the distribution of systemic velocities for our galaxies with their location on the sky. Finally, we discuss several interesting sources from our subset of APPSS galaxies. This work has been supported by NSF grants AST-1211005, AST-1637299, and AST-1637339

  20. Use of the PISCES Database: power plant aqueous stream compositions

    International Nuclear Information System (INIS)

    Behrens, G.P.; Orr, D.A.; Wetherold, R.G.; O'Neil, B.T.

    1996-01-01

    The Power Plant Integrated Systems: Chemical Emissions Studies (PISCES) Database sponsored by the Electric Power Research Institute is a powerful tool for evaluating and comparing the level of trace substances in power plant process streams. In this paper, data are presented on the level of several selected trace metals found in a few of the aqueous streams present in power plants. A brief discussion of other features of the Database is presented. The majority of the data is for coal fired power plants, with only 5% pertaining to oil and gas. Sources of pollution include: ash streams; cooling water; coal pile runoff; FGD liquids; makeup water; and wastewater. 11 refs., 10 figs., 1 tab

  1. Population structure and connectivity of tiger sharks (Galeocerdo cuvier) across the Indo-Pacific Ocean basin

    DEFF Research Database (Denmark)

    Holmes, Bonnie J.; Williams, Samuel M.; Otway, Nicholas M.

    2017-01-01

    Population genetic structure using nine polymorphic nuclear microsatellite loci was assessed for the tiger shark (Galeocerdo cuvier) at seven locations across the Indo-Pacific, and one location in the southern Atlantic. Genetic analyses revealed considerable genetic structuring (FST > 0.14, p....001) between all Indo-Pacific locations and Brazil. By contrast, no significant genetic differences were observed between locations from within the Pacific or Indian Oceans, identifying an apparent large, single Indo-Pacific population. A lack of differentiation between tiger sharks sampled in Hawaii and other...... Indo-Pacific locations identified herein is in contrast to an earlier global tiger shark nDNA study. The results of our power analysis provide evidence to suggest that the larger sample sizes used here negated any weak population subdivision observed previously. These results further highlight the need...

  2. The Round robin test of the PISC-2 programme: plates and ultrasonic procedures used PISC 2 report N.2. Final issue

    International Nuclear Information System (INIS)

    1986-09-01

    Ultrasonic testing is widely used for detecting, locating and sizing defects in primary circuit elements at various stages of plant life. The successive PISC projects have together made up a most notable sustained international effort to assess the effectiveness of these inspection techniques. The Plate Inspection Steering Committee (PISC-I) programme (1976-1980) was intended to establish the capabilities of manual ultrasonic procedure based on the 1974 ASME Code Section XI Procedure. The Programme for the Inspection of Steel Components (PISC-II, 1981-1986) constitutes a broader based evaluation of the best performance obtainable by modern ultrasonic techniques under optimal conditions. The present paper is the second in a series of reports currently being issued which describe the results of the PISC-II studies. Included are descriptions of the four round robin test plates and of the ultrasonic procedures applied to them by the participating inspection teams. The report also lists the participating organisations and gives the time schedule of the tests and an indication of the costs incurred

  3. Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST-AFTA

    Science.gov (United States)

    Gong, Qian; Mcelwain, Michael; Greeley, Bradford; Grammer, Bryan; Marx, Catherine; Memarsadeghi, Nargess; Stapelfeldt, Karl; Hilton, George; Sayson, Jorge Llop; Perrin, Marshall; hide

    2015-01-01

    Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) is a lenslet array based integral field spectrometer (IFS) designed for high contrast imaging of extrasolar planets. PISCES will be used to advance the technology readiness of the high contrast IFS baselined on the Wide-Field InfraRed Survey Telescope/Astrophysics Focused Telescope Assets (WFIRST-AFTA) coronagraph instrument. PISCES will be integrated into the high contrast imaging testbed (HCIT) at the Jet Propulsion Laboratory (JPL) and will work with both the Hybrid Lyot Coronagraph (HLC) and the Shaped Pupil Coronagraph (SPC) configurations. We discuss why the lenslet array based IFS was selected for PISCES. We present the PISCES optical design, including the similarities and differences of lenslet based IFSs to normal spectrometers, the trade-off between a refractive design and reflective design, as well as the specific function of our pinhole mask on the back surface of the lenslet array to reduce the diffraction from the edge of the lenslets. The optical analysis, alignment plan, and mechanical design of the instrument will be discussed.

  4. Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST/AFTA

    Science.gov (United States)

    Gong, Qian; Mcelwain, Michael; Greeley, Bradford; Grammer, Bryan; Marx, Catherine; Memarsadeghi, Nargess; Stapelfeldt, Karl; Hilton, George; Sayson, Jorge Llop; Perrin, Marshall; hide

    2015-01-01

    Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) is a lenslet array based integral field spectrometer (IFS) designed for high contrast imaging of extrasolar planets. PISCES will be used to advance the technology readiness of the high contrast IFS baselined on the Wide-Field InfraRed Survey Telescope/Astrophysics Focused Telescope Assets (WFIRST/AFTA) coronagraph instrument. PISCES will be integrated into the high contrast imaging testbed (HCIT) at the Jet Propulsion Laboratory and will work with both the Hybrid Lyot Coronagraph (HLC) and the Shaped Pupil Coronagraph (SPC) cofigurations. We discuss why the lenslet array based IFS is selected for PISCES. We present the PISCES optical design, including the similarities and differences of lenslet based IFSs to normal spectrometers, the trade-off between a refractive design and reflective design, as well as the specific function of our pinhole mask on the back surface of the lenslet array to further suppress star light introduced speckles. The optical analysis, alignment plan, and mechanical design of the instrument will be discussed.

  5. Aspectos biológicos de Diapterus rhombeus (Cuvier) (Teleostei, Gerreidae) na Baía de Guaratuba, Paraná, Brasil Biological aspects of Diapterus rhombeus (Cuvier) (Teleostei, Gerreidae) at Guaratuba Bay, Paraná, Brazil

    OpenAIRE

    Paulo de Tarso da Cunha Chaves; Gislaine Otto

    1998-01-01

    Diapterus rhombeus (Cuvier, 1829) is one of the most common Gerreidae species in the estuarine region at the Guaratuba Bay, Southern Brazil. Based on studies developed between July, 1993 and January, 1997, it was observed that its presence in the mangrove area is not regular: the smallest individuais are more abundam during late summer and in autumn, and the largest ones during spring and early summer. Its diet comprises plant material and invertebrates, specially polychaets. The morphologica...

  6. Notas sobre la reproducción en cautiverio de Crocodylus acutus (Cuvier, 1807 en el Perú

    Directory of Open Access Journals (Sweden)

    Oswaldo Pérez

    2013-05-01

    Full Text Available Durante los años 2001 y 2002 se realizaron observaciones sobre la reproducción de Crocodylus acutus (Cuvier, 1807 en el Centro de Acuicultura La Tuna Carranza, localizado en Puerto Pizarro, departamento de Tumbes. El tamaño mínimo de una hembra anidando fue de 2,30 m. El porcentaje de viabilidad y natalidad fue de 61,71% y 93,15% respectivamente.

  7. Temporal and Spatial Distribution of Catches of Tiger Sharks, Galeocerdo cuvier, in the Pelagic Longline Fishery Around the Hawaiian Islands

    OpenAIRE

    Polovina, Jeffrey J.; Lau, Boulderson B.

    1993-01-01

    Thirty-five tiger sharks, Galeocerdo cuvier, have been reported caught in pelagic longline gearfrom 25 to 265 n.mi. off the Hawaiian Archipelago during December 1990-May 1993. Fifteen sharks were caught farther than 50 n.mi. offshore, indicating that tiger sharks do occur well offshore and removed from benthic topography. About 89% of the sharks were caught during October-March, while only 56% of the fishing effort occurred during that period.

  8. Lessons learned from the PISC III study of the influence on human factors on inspection reliability

    International Nuclear Information System (INIS)

    Murgatroyd, R.A.; Worrall, G.M.; Crutzen, S.

    1995-01-01

    Results from the PISC II Programme suggested that differences existed between manual inspectors in terms of their skills, knowledge and working practices which could exert a significant influence on the reliability on an inspection. Therefore, a programme of work on human reliability studies was initiated in the PISC III Programme as Action 7, with the objectives of studying and identifying causes of variability in inspection activities, and identifying some of the factors influencing the reliability of inspection in industrial conditions. It was foreseen that the information from Action 7 would aid in the development of methods for reducing the incidence of human error in inspection activities. This paper gives a brief summary of the programme and describes the lessons learned as a result of the work. A considerably more detailed description of the work is available as a PISC report. 3 refs, 3 figs

  9. Comportamento reprodutivo do acará bandeira, Pterophyllum scalare Cuvier & Valenciennes (Osteichthyes, Cichlidae Reproductive behaviour of Pterophyllum scalare Cuvier & Valenciennes (Osteichthyes, Cichlidae

    Directory of Open Access Journals (Sweden)

    Maria do Socorro R.F Cacho

    1999-01-01

    Full Text Available Acará bandeira, Pterophyllum scalare Cuvier & Valenciennes, 1831 is a Neotropical cichlid fish, which has not been studied under a scientific approach. The objective of this work was to identify and describe the reproductive behaviour involved in the various phases of its reproductive cycle, such as territorial disputes and its establishment, substrate selection for spawning, courtship and mating, selection of mate and parental care. Twenty males and ten females of the study species were observed in the laboratory, over a period of six consecutive months. Behaviour descriptions resulting from these observations were analysed and the results show that the reproductive males are very agressive in the initial phase of reproduction. Agressiveness is a constant variable in encounters between territorial fishes, and possession of territory is of fundamental importance for reproduction of this species. Males with established territories were those which very successful in atracting the females during courtship. The selection of the females were influenced by the possession of territory, the type of substrate available for spawning and the body size. The fish preferred aquatic plants with broad leaves as an adequate substrate for spawning. It was observed that there was a short-term biparental care, before the eggs hatched, during which period the males played an important role in protecting them. After the eggs hatched, the male continued to protect the hatchling in his mouth, but played a lesser role, possibly to seek other females for mating so as to increase his reproductive output. Selection of a good mate by the female and the high degree of parental care were the factors which influence the reproductive success of the study species.

  10. Some helminth parasites of Epinephelus morio (Pisces: Serranidae) from the peninsula of Yucatan, Mexico

    NARCIS (Netherlands)

    Moravec, F.; Vidal-Martínez, V.M.; Aguirre-Macedo, M.L.

    1995-01-01

    Moravec, F., V.M. Vidal-Martinez & M.L. Aguirre-Macedo, 1995. Some helminth parasites of Epinephelus morio (Pisces: Serranidae) from the Peninsula of Yucatan, Mexico. Studies Nat. Hist. Caribbean Region 72: 55-68. One nematode species, Hysterothylacium eurycheilum, the acanthocephalan Gorgorhynchus

  11. The ATFI facilities for the PISC III programme

    International Nuclear Information System (INIS)

    Borloo, E.; Daniele, F.; Jehenson, P.; Van den Bergh, R.; Violin, F.

    1990-01-01

    The initial use of the ATFI facilities (Atelier des Tubes de Force Irradies) was to perform, in the frame of the ORGEL programme (1960-1968), examination and controls on irradiated pressure tubes and the cutting of these pressure tubes for delivery to experimental workers or for evacuation as waste. Since the end of the ORGEL programme, the ATFI facilities have also been used for specific measurements on other irradiated materials. The (CEC-OECD) PISC III programme is directed towards detection and sizing of service induced flaws. Sections of Nuclear Reactors components that really have been in service have to be examined. In 1983, the Commission of the European Communities decided that the ATFI facilities had to be able to perform. (1) the ultrasonic and X-ray examinations of contaminated steel specimens (ferritic and austenitic) up to 4 tons. 1 m 3 as maximum overall dimensions and 250 mm maximum thickness, with a maximum radioactivity contact dose less than 1Rem/h and little transferable contamination. (2) the destructive examination of these contaminated specimens

  12. Spectroscopic studies of carbon impurities in PISCES-A

    International Nuclear Information System (INIS)

    Ra, Y.; Hirooka, Y.; Leung, W.K.; Conn, R.W.; Pospieszczyk, A.

    1989-08-01

    The graphite used for the limiter of the tokamak reactor produces carbon-containing molecular impurities as a result of the interactions with the edge plasma. The behavior of these molecular impurities has been studied using emission spectroscopy. The present study includes: finding molecular bands and atomic lines in the visible spectral range which can be used for the study of the molecular impurities, studying the breakup processes of the molecular impurities on their way from the source into the plasma, developing a spectroscopic diagnostic method for the absolute measurement of the molecular impurity flux resulting from graphite erosion. For these studies, carbon-containing molecules such as CH 4 , C 2 H 2 , C 2 H 4 , and CO 2 were injected into the tokamak-boundary,like plasma generated by PISCES-A. The spectrograms of these gases were taken. Many useful bands and lines were determined from the spectrograms. The breakup processes of these gases were studied by observing the spatial profiles of the emission of the molecules and their radicals for different plasma conditions. For the absolute measurement of the eroded molecular impurity flux, the photon efficiency of the lines and bands were found by measuring the absolute number of the emitted photons and injected gas molecules. The chemical sputtering yield of graphite by hydrogen plasma was spectroscopically measured using the previously obtained photon efficiencies. It showed good agreement with results obtained by weight loss measurements. 16 refs., 7 figs., 1 tab

  13. An Overview of Recent PISCES Program PMI Results

    Science.gov (United States)

    Tynan, George; Doerner, Russell; Abe, Shota; Baldwin, Matthew; Barton, Joseph; Chen, Renkun; Gosselin, Jordan; Hollmann, Eric; Nishijima, Daisuke; Simmonds, Michael; Wang, Yong; Yu, Jonathan

    2015-11-01

    The PISCES Program is focused on fundamental PMI studies of Be and W-based solid plasma facing components under steady-state and transient conditions. We will show results from studies in W, Be and mixed W-Be material systems. Topics of investigation include formation of near-surface nanobubbles from He plasma ion implantation, growth of W-fuzz from these bubbles in steady-state and transient conditions, D retention in Be and W and development of a D-retention model for both H/D isotope exchange and displacement damage experiments. Initial studies of PMI in displacement damaged W are also presented, showing the effect of damage and exposure temperature on D retention, D diffusion, W thermal conductivity. Be-based results include morphology evolution under high plasma flux exposure, Be erosion mechanisms, and retention in Be-based materials. Future plans and connections to fusion energy system requirements will be discussed. This work supported by grant DE-FG02-07ER54912.

  14. Age and growth of the fish, Gerres filamentosus (Cuvier, 1829 from Hurghada Red Sea, Egypt

    Directory of Open Access Journals (Sweden)

    Taher Mohamed Ahmed Abu El-Nasr

    2017-09-01

    Full Text Available A total of 669, Gerres filamentosus (Cuvier, 1829 were collected from Hurghada area in the Egyptian Red Sea coast (January – December 2010. The author investigated the age and growth by two different methods through scale-annuli reading (Direct method and Length-frequency distribution (Indirect method which showed new record of lengths for the species. The equations of the length-weight relationship was W = 0.0143∗ L2.9564 (Males, W = 0.0146∗ L2.9543 (Females and W = 0.0144∗ L2.9597 (combined sexes. The von Bertalanffy growth equation was calculated by three different mathematical methods. It was concluded that it would be economical to protect this species from capture until at least their 5th year, after the fish has reached about 32.71 cm in total length and about 439.15 grams in weight. Keywords: Mojarra, Whipfin, Silver-biddy, Length-weight, Age groups, Frequency distribution

  15. Vertical movement patterns and ontogenetic niche expansion in the tiger shark, Galeocerdo cuvier.

    Science.gov (United States)

    Afonso, André S; Hazin, Fábio H V

    2015-01-01

    Sharks are top predators in many marine ecosystems and can impact community dynamics, yet many shark populations are undergoing severe declines primarily due to overfishing. Obtaining species-specific knowledge on shark spatial ecology is important to implement adequate management strategies for the effective conservation of these taxa. This is particularly relevant concerning highly-mobile species that use wide home ranges comprising coastal and oceanic habitats, such as tiger sharks, Galeocerdo cuvier. We deployed satellite tags in 20 juvenile tiger sharks off northeastern Brazil to assess the effect of intrinsic and extrinsic factors on depth and temperature usage. Sharks were tracked for a total of 1184 d and used waters up to 1112 m in depth. The minimum temperature recorded equaled 4°C. All sharks had a clear preference for surface (sharks used mostly shallow (sharks spending considerably more time in surface (shark habitat was observed, with generalized linear models estimating a ~4-fold increase in maximum diving depth from 150- to 300-cm size-classes. The time spent in the upper 5 m of the water column did not vary ontogenetically but shark size was the most important factor explaining the utilization of deeper water layers. Young-of-the-year tiger sharks seem to associate with shallow, neritic habitats but they progressively move into deeper oceanic habitats as they grow larger. Such an early plasticity in habitat use could endow tiger sharks with access to previously unavailable prey, thus contributing to a wider ecological niche.

  16. Octopus vulgaris (Cuvier, 1797) in the Mediterranean Sea: Genetic Diversity and Population Structure.

    Science.gov (United States)

    De Luca, Daniele; Catanese, Gaetano; Procaccini, Gabriele; Fiorito, Graziano

    2016-01-01

    The common octopus, Octopus vulgaris Cuvier 1797, is a largely exploited cephalopod species in the Mediterranean Sea and the Atlantic Ocean, as well as along the coasts of Africa, Brazil and Japan, where its taxonomic identity is still debated. The assessment of its genetic structure is a pressing need to correctly manage the resource and to avoid overfishing and collapsing of local stocks. Here we analysed genetic variation and population structure of O. vulgaris using thirteen microsatellite loci in seven sampling localities from the Mediterranean Sea and one from the Atlantic Ocean. We also used a DNA barcoding approach by COI gene fragment to understand the phylogenetic relationships among the specimens here investigated and the ones whose sequences are available in literature. Our results reveal high levels of allelic richness and moderate heterozygosity in all samples investigated, and a pronounced differentiation of the Atlantic and Sicilian specimens. This latter aspect seems to support the isolation of the biota within the Strait of Messina. A certain degree of differentiation was detected among the other geographic samples within the Mediterranean Sea, which is more compatible with an island model than isolation by distance. The occurrence of null alleles affected more genetic diversity indices than population structure estimations. This study provides new insights about the genetic diversity and structure of O. vulgaris in the area of interest, which can be used as guidelines for a fisheries management perspective.

  17. Testicular maturation of Oligosarcus hepsetus (Cuvier (Actinopterygii, Characidae in a brazilian tropical reservoir

    Directory of Open Access Journals (Sweden)

    R. N. Santos

    Full Text Available Six reproductive classes of male Oligosarcus hepsetus (Cuvier, 1829, a medium-sized carnivorous Characiform species, are described based on macroscopic and histological techniques. A total of 175 individuals were caught monthly between April 2001 and June 2002 in the Lajes Reservoir, Brazil, one of the largest impoundment areas in the state of Rio de Janeiro. The reproductive classes were based upon changes in the testicular morphology and stages of germinative cells, i.e., resting, early maturing, late maturing, mature, partially spent and totally spent. Fish in the resting class showed testes with spermatogonia and spermatocytes along the wall of seminal lobules, while spermatids were present in the lumina of the lobules. During early maturing, active spermatogenesis occurs throughout the testis; in the late maturing and mature classes, the lobules are swollen with sperm that are typical of fish in breeding condition. Spent testes presented seminal lobules with residual spermatozoa, coinciding with decreasing GSI and greatly reduced sperm production. Overall, the testicular morphology and class of maturity development of O. hepsetus in the Lajes reservoir did not differ significantly from those of closely related species in other lentic environments. Lower GSI values in the oligotrophic Lajes reservoir than in other eutrophic natural lakes suggest that this species may be modifying this aspect of its reproductive strategy in response to the artificial environment.

  18. PISCES-v2: an ocean biogeochemical model for carbon and ecosystem studies

    Directory of Open Access Journals (Sweden)

    O. Aumont

    2015-08-01

    of marine ecosystems (phytoplankton, microzooplankton and mesozooplankton and the biogeochemical cycles of carbon and of the main nutrients (P, N, Fe, and Si. The model is intended to be used for both regional and global configurations at high or low spatial resolutions as well as for short-term (seasonal, interannual and long-term (climate change, paleoceanography analyses. There are 24 prognostic variables (tracers including two phytoplankton compartments (diatoms and nanophytoplankton, two zooplankton size classes (microzooplankton and mesozooplankton and a description of the carbonate chemistry. Formulations in PISCES-v2 are based on a mixed Monod–quota formalism. On the one hand, stoichiometry of C / N / P is fixed and growth rate of phytoplankton is limited by the external availability in N, P and Si. On the other hand, the iron and silicon quotas are variable and the growth rate of phytoplankton is limited by the internal availability in Fe. Various parameterizations can be activated in PISCES-v2, setting, for instance, the complexity of iron chemistry or the description of particulate organic materials. So far, PISCES-v2 has been coupled to the Nucleus for European Modelling of the Ocean (NEMO and Regional Ocean Modeling System (ROMS systems. A full description of PISCES-v2 and of its optional functionalities is provided here. The results of a quasi-steady-state simulation are presented and evaluated against diverse observational and satellite-derived data. Finally, some of the new functionalities of PISCES-v2 are tested in a series of sensitivity experiments.

  19. Haematological characteristics of Brazilian Teleosts: III. Parameters of the hybrid tambacu (Piaractus mesopotamicus Holmberg x Colossoma macropomum Cuvier (Osteichthyes, Characidae

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    2000-12-01

    Full Text Available Fifty six specimens of the hybrid "tambacu" (Piaractus mesopotamicus Holmberg, 1887 male x Colossoma macropomum Cuvier, 1818 female were collected from fishfarm of Guariba, São Paulo, to evaluate their haematology. Fishes presented 400.0 to 3,100.0 g total weight and 20.0 to 52.0 cm total length. Haemoglobin, haematocrit, mean corpuscular haemoglobin content (MCHC and percentage of defense blood cells including leucocytes and thrombocytes, were studied. Statistical analysis showed positive correlation (P<0.01 between haematocrit, MCHC and haemoglobin rate. Nevertheless, thrombocytes and lymphocytes showed negative correlation (P<0.01.

  20. Studi Aspek Reproduksi Ikan Baung (Mystus nemurus Cuvier Vallenciennes) Di Sungai Bingai Kota Binjai Provinsi Sumatera Utara

    OpenAIRE

    Manurung, Vindy Rilani

    2014-01-01

    VINDY RILANI MANURUNG: The Studied of Fish Reproduction Baung (Mystus nemurus Cuvier Vallenciennes) in Bigai’s River Binjai City North Sumatera Province. Under direction of YUNASFI and DESRITA. The researcher was conducted in the Bingai’s river at Binjai North Sumatera which was held in March to May 2013 at the three different locations points and using sensus metode. The total of baung’s fish (Mystus nemurus C.V) obtained was 29 tails consist of 26 females and 3 males with unbalanced sex ...

  1. Trophic ecomorphology of Siluriformes (Pisces, Osteichthyes) from a tropical stream.

    Science.gov (United States)

    Pagotto, J P A; Goulart, E; Oliveira, E F; Yamamura, C B

    2011-05-01

    The present study analysed the relationship between morphology and trophic structure of Siluriformes (Pisces, Osteichthyes) from the Caracu Stream (22º 45' S and 53º 15' W), a tributary of the Paraná River (Brazil). Sampling was carried out at three sites using electrofishing, and two species of Loricariidae and four of Heptapteridae were obtained. A cluster analysis revealed the presence of three trophic guilds (detritivores, insectivores and omnivores). Principal components analysis demonstrated the segregation of two ecomorphotypes: at one extreme there were the detritivores (Loricariidae) with morphological structures that are fundamental in allowing them to fix themselves to substrates characterised by rushing torrents, thus permitting them to graze on the detritus and organic materials encrusted on the substrate; at the other extreme of the gradient there were the insectivores and omnivores (Heptapteridae), with morphological characteristics that promote superior performance in the exploitation of structurally complex habitats with low current velocity, colonised by insects and plants. Canonical discriminant analysis revealed an ecomorphological divergence between insectivores, which have morphological structures that permit them to capture prey in small spaces among rocks, and omnivores, which have a more compressed body and tend to explore food items deposited in marginal backwater zones. Mantel tests showed that trophic structure was significantly related to the body shape of a species, independently of the phylogenetic history, indicating that, in this case, there was an ecomorphotype for each trophic guild. Therefore, the present study demonstrated that the Siluriformes of the Caracu Stream were ecomorphologically structured and that morphology can be applied as an additional tool in predicting the trophic structure of this group.

  2. Trophic ecomorphology of Siluriformes (Pisces, Osteichthyes from a tropical stream

    Directory of Open Access Journals (Sweden)

    JPA Pagotto

    Full Text Available The present study analysed the relationship between morphology and trophic structure of Siluriformes (Pisces, Osteichthyes from the Caracu Stream (22º 45' S and 53º 15' W, a tributary of the Paraná River (Brazil. Sampling was carried out at three sites using electrofishing, and two species of Loricariidae and four of Heptapteridae were obtained. A cluster analysis revealed the presence of three trophic guilds (detritivores, insectivores and omnivores. Principal components analysis demonstrated the segregation of two ecomorphotypes: at one extreme there were the detritivores (Loricariidae with morphological structures that are fundamental in allowing them to fix themselves to substrates characterised by rushing torrents, thus permitting them to graze on the detritus and organic materials encrusted on the substrate; at the other extreme of the gradient there were the insectivores and omnivores (Heptapteridae, with morphological characteristics that promote superior performance in the exploitation of structurally complex habitats with low current velocity, colonised by insects and plants. Canonical discriminant analysis revealed an ecomorphological divergence between insectivores, which have morphological structures that permit them to capture prey in small spaces among rocks, and omnivores, which have a more compressed body and tend to explore food items deposited in marginal backwater zones. Mantel tests showed that trophic structure was significantly related to the body shape of a species, independently of the phylogenetic history, indicating that, in this case, there was an ecomorphotype for each trophic guild. Therefore, the present study demonstrated that the Siluriformes of the Caracu Stream were ecomorphologically structured and that morphology can be applied as an additional tool in predicting the trophic structure of this group.

  3. Growth and maximum size of tiger sharks (Galeocerdo cuvier) in Hawaii.

    Science.gov (United States)

    Meyer, Carl G; O'Malley, Joseph M; Papastamatiou, Yannis P; Dale, Jonathan J; Hutchinson, Melanie R; Anderson, James M; Royer, Mark A; Holland, Kim N

    2014-01-01

    Tiger sharks (Galecerdo cuvier) are apex predators characterized by their broad diet, large size and rapid growth. Tiger shark maximum size is typically between 380 & 450 cm Total Length (TL), with a few individuals reaching 550 cm TL, but the maximum size of tiger sharks in Hawaii waters remains uncertain. A previous study suggested tiger sharks grow rather slowly in Hawaii compared to other regions, but this may have been an artifact of the method used to estimate growth (unvalidated vertebral ring counts) compounded by small sample size and narrow size range. Since 1993, the University of Hawaii has conducted a research program aimed at elucidating tiger shark biology, and to date 420 tiger sharks have been tagged and 50 recaptured. All recaptures were from Hawaii except a single shark recaptured off Isla Jacques Cousteau (24°13'17″N 109°52'14″W), in the southern Gulf of California (minimum distance between tag and recapture sites  =  approximately 5,000 km), after 366 days at liberty (DAL). We used these empirical mark-recapture data to estimate growth rates and maximum size for tiger sharks in Hawaii. We found that tiger sharks in Hawaii grow twice as fast as previously thought, on average reaching 340 cm TL by age 5, and attaining a maximum size of 403 cm TL. Our model indicates the fastest growing individuals attain 400 cm TL by age 5, and the largest reach a maximum size of 444 cm TL. The largest shark captured during our study was 464 cm TL but individuals >450 cm TL were extremely rare (0.005% of sharks captured). We conclude that tiger shark growth rates and maximum sizes in Hawaii are generally consistent with those in other regions, and hypothesize that a broad diet may help them to achieve this rapid growth by maximizing prey consumption rates.

  4. Reef-fidelity and migration of tiger sharks, Galeocerdo cuvier, across the coral sea

    KAUST Repository

    Werry, Jonathan M.

    2014-01-08

    Knowledge of the habitat use and migration patterns of large sharks is important for assessing the effectiveness of large predator Marine Protected Areas (MPAs), vulnerability to fisheries and environmental influences, and management of shark-human interactions. Here we compare movement, reef-fidelity, and ocean migration for tiger sharks, Galeocerdo cuvier, across the Coral Sea, with an emphasis on New Caledonia. Thirty-three tiger sharks (1.54 to 3.9 m total length) were tagged with passive acoustic transmitters and their localised movements monitored on receiver arrays in New Caledonia, the Chesterfield and Lord Howe Islands in the Coral Sea, and the east coast of Queensland, Australia. Satellite tags were also used to determine habitat use and movements among habitats across the Coral Sea. Sub-adults and one male adult tiger shark displayed year-round residency in the Chesterfields with two females tagged in the Chesterfields and detected on the Great Barrier Reef, Australia, after 591 and 842 days respectively. In coastal barrier reefs, tiger sharks were transient at acoustic arrays and each individual demonstrated a unique pattern of occurrence. From 2009 to 2013, fourteen sharks with satellite and acoustic tags undertook wide-ranging movements up to 1114 km across the Coral Sea with eight detected back on acoustic arrays up to 405 days after being tagged. Tiger sharks dove 1136 m and utilised three-dimensional activity spaces averaged at 2360 km3. The Chesterfield Islands appear to be important habitat for sub-adults and adult male tiger sharks. Management strategies need to consider the wide-ranging movements of large (sub-adult and adult) male and female tiger sharks at the individual level, whereas fidelity to specific coastal reefs may be consistent across groups of individuals. Coastal barrier reef MPAs, however, only afford brief protection for large tiger sharks, therefore determining the importance of other oceanic Coral Sea reefs should be a

  5. Residency and movement patterns of an apex predatory shark (Galeocerdo cuvier at the Galapagos Marine Reserve.

    Directory of Open Access Journals (Sweden)

    David Acuña-Marrero

    Full Text Available The potential effectiveness of marine protected areas (MPAs as a conservation tool for large sharks has been questioned due to the limited spatial extent of most MPAs in contrast to the complex life history and high mobility of many sharks. Here we evaluated the movement dynamics of a highly migratory apex predatory shark (tiger shark Galeocerdo cuvier at the Galapagos Marine Reserve (GMR. Using data from satellite tracking passive acoustic telemetry, and stereo baited remote underwater video, we estimated residency, activity spaces, site fidelity, distributional abundances and migration patterns from the GMR and in relation to nesting beaches of green sea turtles (Chelonia mydas, a seasonally abundant and predictable prey source for large tiger sharks. Tiger sharks exhibited a high degree of philopatry, with 93% of the total satellite-tracked time across all individuals occurring within the GMR. Large sharks (> 200 cm TL concentrated their movements in front of the two most important green sea turtle-nesting beaches in the GMR, visiting them on a daily basis during nocturnal hours. In contrast, small sharks (< 200 cm TL rarely visited turtle-nesting areas and displayed diurnal presence at a third location where only immature sharks were found. Small and some large individuals remained in the three study areas even outside of the turtle-nesting season. Only two sharks were satellite-tracked outside of the GMR, and following long-distance migrations, both individuals returned to turtle-nesting beaches at the subsequent turtle-nesting season. The spatial patterns of residency and site fidelity of tiger sharks suggest that the presence of a predictable source of prey and suitable habitats might reduce the spatial extent of this large shark that is highly migratory in other parts of its range. This highly philopatric behaviour enhances the potential effectiveness of the GMR for their protection.

  6. Reef-fidelity and migration of tiger sharks, Galeocerdo cuvier, across the coral sea

    KAUST Repository

    Werry, Jonathan M.; Planes, Serge; Berumen, Michael L.; Lee, Kate A.; Braun, Camrin D.; Clua, Eric

    2014-01-01

    Knowledge of the habitat use and migration patterns of large sharks is important for assessing the effectiveness of large predator Marine Protected Areas (MPAs), vulnerability to fisheries and environmental influences, and management of shark-human interactions. Here we compare movement, reef-fidelity, and ocean migration for tiger sharks, Galeocerdo cuvier, across the Coral Sea, with an emphasis on New Caledonia. Thirty-three tiger sharks (1.54 to 3.9 m total length) were tagged with passive acoustic transmitters and their localised movements monitored on receiver arrays in New Caledonia, the Chesterfield and Lord Howe Islands in the Coral Sea, and the east coast of Queensland, Australia. Satellite tags were also used to determine habitat use and movements among habitats across the Coral Sea. Sub-adults and one male adult tiger shark displayed year-round residency in the Chesterfields with two females tagged in the Chesterfields and detected on the Great Barrier Reef, Australia, after 591 and 842 days respectively. In coastal barrier reefs, tiger sharks were transient at acoustic arrays and each individual demonstrated a unique pattern of occurrence. From 2009 to 2013, fourteen sharks with satellite and acoustic tags undertook wide-ranging movements up to 1114 km across the Coral Sea with eight detected back on acoustic arrays up to 405 days after being tagged. Tiger sharks dove 1136 m and utilised three-dimensional activity spaces averaged at 2360 km3. The Chesterfield Islands appear to be important habitat for sub-adults and adult male tiger sharks. Management strategies need to consider the wide-ranging movements of large (sub-adult and adult) male and female tiger sharks at the individual level, whereas fidelity to specific coastal reefs may be consistent across groups of individuals. Coastal barrier reef MPAs, however, only afford brief protection for large tiger sharks, therefore determining the importance of other oceanic Coral Sea reefs should be a

  7. Better Fitness in Captive Cuvier's Gazelle despite Inbreeding Increase: Evidence of Purging?

    Directory of Open Access Journals (Sweden)

    Eulalia Moreno

    Full Text Available Captive breeding of endangered species often aims at preserving genetic diversity and to avoid the harmful effects of inbreeding. However, deleterious alleles causing inbreeding depression can be purged when inbreeding persists over several generations. Despite its great importance both for evolutionary biology and for captive breeding programmes, few studies have addressed whether and to which extent purging may occur. Here we undertake a longitudinal study with the largest captive population of Cuvier's gazelle managed under a European Endangered Species Programme since 1975. Previous results in this population have shown that highly inbred mothers tend to produce more daughters, and this fact was used in 2006 to reach a more appropriate sex-ratio in this polygynous species by changing the pairing strategy (i.e., pairing some inbred females instead of keeping them as surplus individuals in the population. Here, by using studbook data we explore whether purging has occurred in the population by investigating whether after the change in pairing strategy a inbreeding and homozygosity increased at the population level, b fitness (survival increased, and c the relationship between inbreeding and juvenile survival, was positive. Consistent with the existence of purging, we found an increase in inbreeding coefficients, homozygosity and juvenile survival. In addition, we showed that in the course of the breeding programme the relationship between inbreeding and juvenile survival was not uniform but rather changed over time: it was negative in the early years, flat in the middle years and positive after the change in pairing strategy. We highlight that by allowing inbred individuals to mate in captive stocks we may favour sex-ratio bias towards females, a desirable managing strategy to reduce the surplus of males that force most zoos to use ethical culling and euthanizing management tools. We discuss these possibilities but also acknowledge that many

  8. Intraspecific variation in vertical habitat use by tiger sharks (Galeocerdo cuvier) in the western North Atlantic.

    Science.gov (United States)

    Vaudo, Jeremy J; Wetherbee, Bradley M; Harvey, Guy; Nemeth, Richard S; Aming, Choy; Burnie, Neil; Howey-Jordan, Lucy A; Shivji, Mahmood S

    2014-05-01

    Tiger sharks (Galeocerdo cuvier) are a wide ranging, potentially keystone predator species that display a variety of horizontal movement patterns, making use of coastal and pelagic waters. Far less, however, is known about their vertical movements and use of the water column. We used pop-up satellite archival tags with two data sampling rates (high rate and standard rate tags) to investigate the vertical habitat use and diving behavior of tiger sharks tagged on the Puerto Rico-Virgin Islands platform and off Bermuda between 2008 and 2009. Useable data were received from nine of 14 sharks tagged, tracked over a total of 529 days. Sharks spent the majority of their time making yo-yo dives within the upper 50 m of the water column and considerable time within the upper 5 m of the water column. As a result, sharks typically occupied a narrow daily temperature range (∼2°C). Dives to greater than 200 m were common, and all sharks made dives to at least 250 m, with one shark reaching a depth of 828 m. Despite some similarities among individuals, a great deal of intraspecific variability in vertical habit use was observed. Four distinct depth distributions that were not related to tagging location, horizontal movements, sex, or size were detected. In addition, similar depth distributions did not necessitate similar dive patterns among sharks. Recognition of intraspecific variability in habitat use of top predators can be crucial for effective management of these species and for understanding their influence on ecosystem dynamics.

  9. Intraspecific variation in vertical habitat use by tiger sharks (Galeocerdo cuvier) in the western North Atlantic

    Science.gov (United States)

    Vaudo, Jeremy J; Wetherbee, Bradley M; Harvey, Guy; Nemeth, Richard S; Aming, Choy; Burnie, Neil; Howey-Jordan, Lucy A; Shivji, Mahmood S

    2014-01-01

    Tiger sharks (Galeocerdo cuvier) are a wide ranging, potentially keystone predator species that display a variety of horizontal movement patterns, making use of coastal and pelagic waters. Far less, however, is known about their vertical movements and use of the water column. We used pop-up satellite archival tags with two data sampling rates (high rate and standard rate tags) to investigate the vertical habitat use and diving behavior of tiger sharks tagged on the Puerto Rico–Virgin Islands platform and off Bermuda between 2008 and 2009. Useable data were received from nine of 14 sharks tagged, tracked over a total of 529 days. Sharks spent the majority of their time making yo-yo dives within the upper 50 m of the water column and considerable time within the upper 5 m of the water column. As a result, sharks typically occupied a narrow daily temperature range (∼2°C). Dives to greater than 200 m were common, and all sharks made dives to at least 250 m, with one shark reaching a depth of 828 m. Despite some similarities among individuals, a great deal of intraspecific variability in vertical habit use was observed. Four distinct depth distributions that were not related to tagging location, horizontal movements, sex, or size were detected. In addition, similar depth distributions did not necessitate similar dive patterns among sharks. Recognition of intraspecific variability in habitat use of top predators can be crucial for effective management of these species and for understanding their influence on ecosystem dynamics. PMID:24963376

  10. Reef-fidelity and migration of tiger sharks, Galeocerdo cuvier, across the Coral Sea.

    Science.gov (United States)

    Werry, Jonathan M; Planes, Serge; Berumen, Michael L; Lee, Kate A; Braun, Camrin D; Clua, Eric

    2014-01-01

    Knowledge of the habitat use and migration patterns of large sharks is important for assessing the effectiveness of large predator Marine Protected Areas (MPAs), vulnerability to fisheries and environmental influences, and management of shark-human interactions. Here we compare movement, reef-fidelity, and ocean migration for tiger sharks, Galeocerdo cuvier, across the Coral Sea, with an emphasis on New Caledonia. Thirty-three tiger sharks (1.54 to 3.9 m total length) were tagged with passive acoustic transmitters and their localised movements monitored on receiver arrays in New Caledonia, the Chesterfield and Lord Howe Islands in the Coral Sea, and the east coast of Queensland, Australia. Satellite tags were also used to determine habitat use and movements among habitats across the Coral Sea. Sub-adults and one male adult tiger shark displayed year-round residency in the Chesterfields with two females tagged in the Chesterfields and detected on the Great Barrier Reef, Australia, after 591 and 842 days respectively. In coastal barrier reefs, tiger sharks were transient at acoustic arrays and each individual demonstrated a unique pattern of occurrence. From 2009 to 2013, fourteen sharks with satellite and acoustic tags undertook wide-ranging movements up to 1114 km across the Coral Sea with eight detected back on acoustic arrays up to 405 days after being tagged. Tiger sharks dove 1136 m and utilised three-dimensional activity spaces averaged at 2360 km³. The Chesterfield Islands appear to be important habitat for sub-adults and adult male tiger sharks. Management strategies need to consider the wide-ranging movements of large (sub-adult and adult) male and female tiger sharks at the individual level, whereas fidelity to specific coastal reefs may be consistent across groups of individuals. Coastal barrier reef MPAs, however, only afford brief protection for large tiger sharks, therefore determining the importance of other oceanic Coral Sea reefs should be a

  11. Capability evaluation of Eddy current and ultrasonic in-service inspections of steam generator tubes. A status report of PISC III Action 5

    International Nuclear Information System (INIS)

    Bieth, M.; Birac, C.; Comby, R.

    1998-01-01

    Document summarizes the PISC III (Programme for the Inspection of Steel Components) report No. 41, full description of the PISC III Action 5 on Steam Generator Tubes Inspection, containing all details and final conclusions which are still to be approved by the PISC III Management Board. The report was prepared by the reference laboratory of PISC under guidance and with continuous contribution of the members of the Data Analysis Group (DAG) of this PISC III. There were several procedures which demonstrated good detection capability of major flaws in typical locations of the steam generator. Conclusions of the exercise indicate that capability demonstration is necessary to qualify in service inspection procedures for steam generator tubes

  12. The PISC programme on defective steam generator tubes inspection summary report

    International Nuclear Information System (INIS)

    Birac, C.; Comby, R.; Maciga, G.; Zanella, G.; Perez Prat, J.; Estorff, U. von

    1995-01-01

    The PISC III Actions are intended to extend the results and methodologies of the previous PISC exercises, i.e. the validation of the capabilities of the various examination techniques when used on real defects in real components under realistic conditions of inspection. The objective of this action is relatively close to that of the heavy structures programmes: the experimental evaluation of the performance of test procedures used for steam generator tubes in nuclear power plants during in-service or pre-service inspections. The exercise is a capability exercise consisting of Round Robin Tests on individual tubes including calibration, training and blind test tubes. In this paper the main conclusions from the RRT conducted in the framework of Action 5 will be presented and discussed. (author). 7 refs, 4 figs, 2 tabs

  13. Fuzz growth in the gaps of castellated W in PISCES-A: Experiment and modeling

    Czech Academy of Sciences Publication Activity Database

    Baldwin, M.J.; Dejarnac, Renaud; Komm, Michael; Doerner, R.P.

    2017-01-01

    Roč. 59, č. 6 (2017), č. článku 064006. ISSN 0741-3335 Institutional support: RVO:61389021 Keywords : tungsten fuzz * castellation * SPICE2 * PISCES Subject RIV: BL - Plasma and Gas Discharge Physics OBOR OECD: Fluids and plasma physics (including surface physics) Impact factor: 2.392, year: 2016 http://iopscience.iop.org/article/10.1088/1361-6587/aa6b32/meta

  14. PISC II: Parametric studies. Effect of defect characteristics on immersion focusing probe testing results

    International Nuclear Information System (INIS)

    Dombret, P.

    1989-09-01

    The results of the Round-Robin trials conducted under the PISC I exercise (1976-1980) showed large discrepancies in the defect detection and sizing capability among different flaws. To identify the causes of such dispersions and quantify the effects, a Parametric Study was included in the PISC II project, taking into consideration most characteristics of planar flaws. A number of steel specimens containing various artificial defects was made available for the measurements. The defects were ultrasonically scanned by standard methods and by some advanced techniques the high performance of which had been established in the PISC Round-Robin Tests. This report deals with the beam focusing technique: 2 MHz 45 0 shear wave transducers have been used in immersion to collect the signals generated by the reference reflectors. The results show that the depth and the size of a defect do not affect significantly its detection and sizing, provided that the natural variation of sensitivity and of beam diameter along the propagation axis is taken into account. On the other hand, parameters such as the orientation and the roughness modify the conditions of impact and interference of the acoustic beam with the defect surface, and therefore strongly influence the energy partition in diffracted and specularly reflected rays. As an example, sharp smooth defects insonified under an angle of 45 0 return to the transducer signals approximately 10 times smaller than the ASME code calibration level

  15. Aspectos biológicos de Diapterus rhombeus (Cuvier (Teleostei, Gerreidae na Baía de Guaratuba, Paraná, Brasil Biological aspects of Diapterus rhombeus (Cuvier (Teleostei, Gerreidae at Guaratuba Bay, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Paulo de Tarso da Cunha Chaves

    1998-01-01

    Full Text Available Diapterus rhombeus (Cuvier, 1829 is one of the most common Gerreidae species in the estuarine region at the Guaratuba Bay, Southern Brazil. Based on studies developed between July, 1993 and January, 1997, it was observed that its presence in the mangrove area is not regular: the smallest individuais are more abundam during late summer and in autumn, and the largest ones during spring and early summer. Its diet comprises plant material and invertebrates, specially polychaets. The morphological aspects of the gonads, the monthly changes on the Condition Factor, and lhe monthly distribution of the individual size groups, suggest that this population spawns during the spring, out the estuarine region. The smaller individuais use the mangrove area of Guaratuba Bay to a growth phase, and the adulls to make somatic reserves to the spawning period.

  16. The PISCES Project: How Teacher-Scientist Partners can Enhance Elementary Science Instruction

    Science.gov (United States)

    Reif, C.; Oechel, W.

    2003-12-01

    The PISCES Project (Partnerships Involving the Scientific Community in Elementary Schools www.sdsa.org/pisces) is an innovative program that brings high quality standards-based elementary science curriculum and hands-on laboratory materials into San Diego County's classrooms. The project is funded by the NSF Graduate Teaching Fellows in K-12 Education (GK-12) program. The project was designed and is administered through cooperation among faculty at San Diego State University and the Science Department of the San Diego County Office of Education. Undergraduate and graduate students enrolled in science programs in San Diego area universities including San Diego State University, California State University San Marcos, and University of California San Diego partner with elementary school teachers. Through this partnership, the scientist brings scientific expertise to the classroom while the teacher delivers the lesson using current pedagogic methods. This is accomplished during a 3 month partnership in which the scientist joins the teacher in the classroom a few days each week to complete professional kit-based curriculum such as that available from FOSS (Full Option Science System) and STC (Science and Technology for Children). The teachers remain in the program for two years during which they have continuous access to the kit-based curriculum as well as two to three partnership cycles. Teachers receive assistance outside of the classroom as well attending professional development institutes three times a year to establish and maintain effective science teaching methods. The San Diego Science Alliance and other community and industry supporters provide the additionalfunding necessary to provide this teacher professional development Currenty, PISCES is present in over 40 schools and is able to provide partnerships to over 100 classrooms each year. In addition to the work done in San Diego, the project has expanded to Barrow, Alaska with plans to expand to La Paz

  17. Application of the PISC results and methodology to assess the effectiveness of NDT techniques applied on non nuclear components

    International Nuclear Information System (INIS)

    Maciga, G.; Papponetti, M.; Crutzen, S.; Jehenson, P.

    1990-01-01

    Performance demonstration for NDT has been an active topic for several years. Interest in it came to the fore in the early 1980's when several institutions started to propose to use of realistic training assemblies and the formal approach of Validation Centers. These steps were justified for example by the results of the PISC exercises which concluded that there was a need for performance demonstration starting with capability assessment of techniques and procedure as they were routinely applied. If the PISC programme is put under the general ''Nuclear Motivation'', the PISC Methodology could be extended to problems to structural components in general, such as on conventional power plants, chemical, aerospace and offshore industries, where integrity and safety have regarded as being of great importance. Some themes of NDT inspections of fossil power plant and offshore components that could be objects of validation studies will be illustrated. (author)

  18. The Sternoptychidae (Pisces, Stomiatoidei) of the Amsterdam Mid North Atlantic Plankton Expedition 1980, with a note on specimens intermediate between Argyropelecus aculeatus Valenciennes, 1849 and A. olfersi (Cuvier, 1829)

    NARCIS (Netherlands)

    Pafort-Van Iersel, Trudie

    1981-01-01

    The Sternoptychidae caught during a spring expedition in the Mid North Atlantic in 1980 are studied. Distribution patterns and data on abundance are recorded. It is proposed that Argyropelecus aculeatus and A. olfersi are two formae belonging to one species, the existing phenotypical differences

  19. PiSCES: Pi(scine) stream community estimation software: A tool for nationwide fish assemblage predictions

    Science.gov (United States)

    Background/Question/Methods What species of fish might someone find in a local stream? How might that community change as a result of changes to characteristics of the stream and its watershed? PiSCES is a browser-based toolkit developed to predict a fish community for any NHD-Pl...

  20. Investigation on field removed pipe sections in the PISC hot laboratories

    International Nuclear Information System (INIS)

    Cambini, M.; Crutzen, S.; Jehenson, P.; Bergh, R. Van den; Violin, F.

    1990-01-01

    Action No. 1 of PISC II: Real Contaminated Structures (RCS), seeks to collect results from specific investigations and limited round robin tests on real service induced defects in materials and structures of the primary circuit of Light Water Reactors. The hot cell facilities at JRC-Ispra are fully equipped for non destructive and destructive work on a collaborative basis. Cracked austenitic steel primary circuit pipes coming from the primary circuit of the Muhleberg reactor (Switzerland) have been inspected in order to demonstrate the validity of the facilities to examine these contaminated pieces. (author)

  1. Investigation on field removed pipe sections in the PISC hot laboratories

    International Nuclear Information System (INIS)

    Cambini, M.; Crutzen, S.; Jehenson, P.

    1990-01-01

    Action no. 1 of PISC III (Programme for the Inspection of Steel Components): Real Contaminated Structures (RCS), seeks to collect results from specific investigations and limited round robin tests on real service induced defects in materials and structures of the primary circuit of Light Water Reactors. The hot cell facilities at JRC-Ispra are fully equipped for non destructive and destructive work on a collaborative basis. Cracked austenitic steel pipes coming from the primary circuit of the Muehleberg reactor (Switzerland) have been inspected in order to demonstrate the validity of the facilities for the examination of these contaminated pieces

  2. Statistically based reevaluation of PISC-II round robin test data

    International Nuclear Information System (INIS)

    Heasler, P.G.; Taylor, T.T.; Doctor, S.R.

    1993-05-01

    This report presents a re-analysis of an international PISC-II (Programme for Inspection of Steel Components, Phase 2) round-robin inspection results using formal statistical techniques to account for experimental error. The analysis examines US team performance vs. other participants performance,flaw sizing performance and errors associated with flaw sizing, factors influencing flaw detection probability, performance of all participants with respect to recently adopted ASME Section 11 flaw detection performance demonstration requirements, and develops conclusions concerning ultrasonic inspection capability. Inspection data were gathered on four heavy section steel components which included two plates and two nozzle configurations

  3. The PISC programme on defective steam generator tubes inspection. A status report

    International Nuclear Information System (INIS)

    Birac, C.; Comby, R.; Maciga, G.; Von Estorff, U.; Zanella, G.L.

    1994-06-01

    The general objective of the PISC Program (Programme for the Inspection of Steel Components) is to assess experimentally procedures and techniques in use for the in-service inspection of pressure components. The program is mainly a round robin test, the results of which are compared with real characteristics of the flaws obtained by destructive analysis. Materials tested are INCONEL 600 tubes, diameter 22.22 mm, wall thickness 1.27 mm. The technique applied is eddy current testing. The program of capability tests on loose tubes was started in 1990, the round robin tests ended in 1993. The preliminary results are presented. (R.P.). 8 refs., 9 figs., 4 tabs

  4. RNL automated ultrasonic inspection of the PISC II PWR inlet nozzle (Plate 3)

    International Nuclear Information System (INIS)

    Rogerson, A.; Poulter, L.N.J.; Clough, P.; Cooper, A.G.

    1987-01-01

    In June 1984, Risley Nuclear Laboratories (RNL) performed an automated ultrasonic inspection of the Pressurized Water Reactor (PWR) inlet nozzle (plate 3) from the international Programme of Inspection of Steel Components (PISC II) round-robin inspection programme. High-sensitivity pulse-echo detection and predominantly time-of-flight diffraction sizing techniques were employed from the clad inner surface of the nozzle using digital data collection, analysis, and display facilities developed at RNL. RNL detected 30 out of 31 intended weld flaws, achieved one hundred per cent correct acceptance of all acceptable flaws and had a correct rejection frequency on all rejectable flaws of 0.86. The results confirm that well-conceived automated inspection procedures, similar to those used by RNL in this nozzle inspection, could form the basis of a PSI/ISI procedure for reactor pressure vessel nozzle regions. Analysis of the RNL results with regard to the influence of flaw characteristics on inspection performance lends strong support to the general conclusions drawn by the PISC Data Analysis Group. In particular, the most difficult flaws to accurately size were circular smooth and rough flaws. Examination of the RNL results on individual flaws reveals valuable information on the strengths and weaknesses of the adopted procedures and points towards procedural changes that would improve inspection performance. This report describes the procedures adopted by RNL, in the inspection, and reviews the results in the light of definitive flaw information. (author)

  5. Alimentação de Bairdiella ronchus (Cuvier (Perciformes, Sciaenidae na Baía de Guaratuba, Paraná, Brasil Feeding of Bairdiella ronchus (Cuvier (Perciformes, Sciaenidae at the Guaratuba Bay, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Ana Lúcia Vendel

    1998-01-01

    Full Text Available Seasonal variation of food items of Bairdiella ronchus (Cuvier, 1830 classified by size was analysed based on monthly samples between september/1993 and september/1996 at the Guaratuba Bay, Southern Brazil. The stomach contents of a hundred eighty-two fishes were analysed by the Occunence Frequency Method and Point Count for a Lot Method. The individuais were divided in two groups, smaller and longer than 140mm, and a comparative study of digestive tract and branchial are was performed for these groups. For fishes smaller than 140mm the following sequence of items was obtained matching both methods by using the Preponderance índices: decapods (subdivided in Brachyura, Caridea and Penaeidea, polychaets, isopods, fishes, unidentified material, copepods, amphipods, molluscs and plant material. For fishes longer than or equal to 140mm the sequence was decapods, polychaets, fishes, copepods, amphipods, isopods, molluscs and plant material, in this order. These results suggest that Bairdiella ronchus at the Guaratuba Bay is a carnivorous species using mainly decapod crustaceans as food throughout the year.

  6. Trophic Ecology and Movement Patters of Tiger Sharks (Galeocerdo Cuvier) off the Western North Atlantic Coastal and Continental Shelf Waters

    Science.gov (United States)

    Sancho, G.; Edman, R.; Frazier, B.; Bubley, W.

    2016-02-01

    Understanding the trophic dynamics and habitat utilization of apex predators is central to inferring their influence on different marine landscapes and to help design effective management plans for these animals. Tiger sharks (Galeocerdo cuvier) are abundant in shelf and offshore Gulf Stream waters of the western North Atlantic Ocean, and based on movements from individuals captured in Florida and Bahamas, seem to avoid coastal and shelf waters off South Carolina and Georgia. This contradicts reports of tiger sharks regularly being caught nearshore by anglers in these states, indicating that separate sub-populations may exist in the western North Atlantic. In the present study we captured Tiger Sharks in coastal waters off South Carolina in 2014 and 2015 in order to describe their movement patterns through acoustic and satellite tagging, and trophic dynamics through stable isotope analyses. Movement data show that these tiger sharks repeatedly visit particular inshore areas and mainly travel over the continental shelf, but rarely venture offshore beyond the continental shelf edge. Ongoing C and N stable isotope analyses of muscle, blood and skin tissues from adult and juvenile tiger sharks, as well as from potential prey species and primary producers, will help determine if their diets are based on inshore, shelf or offshore based food webs. Tiger sharks exploiting nearshore environments and shelf waters have much higher probabilities of interacting with humans than individuals occupying far offshore Gulf Stream habitats.

  7. Ontogenic events and swimming behavior of larvae of the characid fish Salminus brasiliensis (Cuvier (Characiformes, Characidae under laboratory conditions

    Directory of Open Access Journals (Sweden)

    José Enemir dos Santos

    2002-03-01

    Full Text Available The larval ontogeny and swimming behavior of the characid fish Salminus brasiliensis (Cuvier, 1816 were studied under experimental laboratory conditions, from hatching to yolk absorption. At day 1, the larvae were transparent, with sparse dendrite chromatophores and a well-developed adhesive organ on the head. The retinal epithelial cells were initiating pigmentation. The branchial arches were at the initial phase of differentiation. The larvae were able to perform only vertical displacements and, when resting on the tank bottom, remained in lateral decumbency, in groups of 3 to 15 larvae. On day 2, the mouth was open, with conical teeth, and the digestive tube presented lumen and folded mucosa. The gaseous bladder and pectoral fins also were in differentiation. The larvae performed vertical and horizontal movements, adhered to the water surface by means of the adhesive organ or formed groups of three to six on the tank bottom. On day 3, the adhesive organ turned dorsal, the retina was pigmented, the digestive tube mucosa showed goblet cells, and the yolk sac exhausted. The larvae were now scattering in the water column forming no groups on the bottom.

  8. ERO modeling of beryllium erosion by helium plasma in experiments at PISCES-B

    Directory of Open Access Journals (Sweden)

    D. Borodin

    2017-08-01

    Full Text Available The beryllium erosion by helium plasma irradiation is studied at the PISCES-B linear plasma device and interpreted using the accompanying simulations by the ERO code. The influence of plasma conditions and varying negative biasing of the Be plasma target on BeI and BeII absolute line intensities are reproduced in detail by the simulations. The synthetic axial line intensity shapes and line ratios match with experiment. This indicates that atomic data are quite accurate. The initial population state of quasi-metastable 3P level in BeI is found to be MS:GS= 0.33:1 for all conditions. The yields determined by the modeling interpretation are compared to the SDTrimSP code simulations in the binary collision approximation.

  9. Calculations of Helium Bubble Evolution in the PISCES Experiments with Cluster Dynamics

    Science.gov (United States)

    Blondel, Sophie; Younkin, Timothy; Wirth, Brian; Lasa, Ane; Green, David; Canik, John; Drobny, Jon; Curreli, Davide

    2017-10-01

    Plasma surface interactions in fusion tokamak reactors involve an inherently multiscale, highly non-equilibrium set of phenomena, for which current models are inadequate to predict the divertor response to and feedback on the plasma. In this presentation, we describe the latest code developments of Xolotl, a spatially-dependent reaction diffusion cluster dynamics code to simulate the divertor surface response to fusion-relevant plasma exposure. Xolotl is part of a code-coupling effort to model both plasma and material simultaneously; the first benchmark for this effort is the series of PISCES linear device experiments. We will discuss the processes leading to surface morphology changes, which further affect erosion, as well as how Xolotl has been updated in order to communicate with other codes. Furthermore, we will show results of the sub-surface evolution of helium bubbles in tungsten as well as the material surface displacement under these conditions.

  10. The PISC exercise: a discussion of its relevance to ultrasonic inspection of pressure vessels

    International Nuclear Information System (INIS)

    Whittle, M.J.; Coffey, J.M.

    1981-01-01

    The value of the European Plate Inspection Steering Committee (PISC) exercise for determining the reliability of ultrasonic inspection of pressure vessels is discussed. It is argued that the particular ultrasonic procedure assessed in the exercise was a poor one whose failure was predictable. In addition the test blocks were sufficiently unrealistic that the value of the results would have been diminished even if all the defects had been found. Consequently the report maintains that the outcome of the exercise is largely irrelevant to the wider question of the reliability of more thorough ultrasonic procedures. A more general discussion is given of the role of test block studies in ultrasonics. Statistical arguments are used to show that it is impracticable to produce a sufficient number of defects to demonstrate a high reliability and have a high confidence in such a result. Some important points for planning future programmes are emphasised. (author)

  11. Codon usage bias and phylogenetic analysis of mitochondrial ND1 gene in pisces, aves, and mammals.

    Science.gov (United States)

    Uddin, Arif; Choudhury, Monisha Nath; Chakraborty, Supriyo

    2018-01-01

    The mitochondrially encoded NADH:ubiquinone oxidoreductase core subunit 1 (MT-ND1) gene is a subunit of the respiratory chain complex I and involved in the first step of the electron transport chain of oxidative phosphorylation (OXPHOS). To understand the pattern of compositional properties, codon usage and expression level of mitochondrial ND1 genes in pisces, aves, and mammals, we used bioinformatic approaches as no work was reported earlier. In this study, a perl script was used for calculating nucleotide contents and different codon usage bias parameters. The codon usage bias of MT-ND1 was low but the expression level was high as revealed from high ENC and CAI value. Correspondence analysis (COA) suggests that the pattern of codon usage for MT-ND1 gene is not same across species and that compositional constraint played an important role in codon usage pattern of this gene among pisces, aves, and mammals. From the regression equation of GC12 on GC3, it can be inferred that the natural selection might have played a dominant role while mutation pressure played a minor role in influencing the codon usage patterns. Further, ND1 gene has a discrepancy with cytochrome B (CYB) gene in preference of codons as evident from COA. The codon usage bias was low. It is influenced by nucleotide composition, natural selection, mutation pressure, length (number) of amino acids, and relative dinucleotide composition. This study helps in understanding the molecular biology, genetics, evolution of MT-ND1 gene, and also for designing a synthetic gene.

  12. Ontogeny of head and caudal fin shape of an apex marine predator: The tiger shark (Galeocerdo cuvier).

    Science.gov (United States)

    Fu, Amy L; Hammerschlag, Neil; Lauder, George V; Wilga, Cheryl D; Kuo, Chi-Yun; Irschick, Duncan J

    2016-05-01

    How morphology changes with size can have profound effects on the life history and ecology of an animal. For apex predators that can impact higher level ecosystem processes, such changes may have consequences for other species. Tiger sharks (Galeocerdo cuvier) are an apex predator in tropical seas, and, as adults, are highly migratory. However, little is known about ontogenetic changes in their body form, especially in relation to two aspects of shape that influence locomotion (caudal fin) and feeding (head shape). We captured digital images of the heads and caudal fins of live tiger sharks from Southern Florida and the Bahamas ranging in body size (hence age), and quantified shape of each using elliptical Fourier analysis. This revealed changes in the shape of the head and caudal fin of tiger sharks across ontogeny. Smaller juvenile tiger sharks show an asymmetrical tail with the dorsal (upper) lobe being substantially larger than the ventral (lower) lobe, and transition to more symmetrical tail in larger adults, although the upper lobe remains relatively larger in adults. The heads of juvenile tiger sharks are more conical, which transition to relatively broader heads over ontogeny. We interpret these changes as a result of two ecological transitions. First, adult tiger sharks can undertake extensive migrations and a more symmetrical tail could be more efficient for swimming longer distances, although we did not test this possibility. Second, adult tiger sharks expand their diet to consume larger and more diverse prey with age (turtles, mammals, and elasmobranchs), which requires substantially greater bite area and force to process. In contrast, juvenile tiger sharks consume smaller prey, such as fishes, crustaceans, and invertebrates. Our data reveal significant morphological shifts in an apex predator, which could have effects for other species that tiger sharks consume and interact with. © 2016 Wiley Periodicals, Inc.

  13. Morphofunctional description of mucous cells in the gills of the Arapaimidae Arapaima gigas (Cuvier) during its development.

    Science.gov (United States)

    Ramos, C A; da Costa, O T F; Duncan, W L P; Fernandes, M N

    2018-05-07

    The gill structure of the Amazonian fish Arapaima gigas (Cuvier 1829) shows ontogenetic changes during development, particularly due the transition from the aquatic to the obligatory air breathing mode of respiration. However, three main cell types can be found in the gills: mitochondrial rich cells, pavement cells and mucous cells (MCs). The MCs are involved in the secretory pathway. The functions of the secreted molecules include mechanical protection of epithelia, protection against parasites and bacterial infection, and role on ion regulation. In this study, we analysed mucous cell location and mucous cell type, based on pH, during the development of A. gigas. Using samples obtained from the environment, gills were collected and fixed in buffered solution. Histological techniques for the identification of MCs were performed Alcian Blue (AB) and periodic acid-Schiff (PAS). The results showed the presence of PAS+ and AB+ cells in the whole filament in all examined fish. In animals less than 50 g, few MCs were present, and no differences were observed in AB+ and PAS+ cells. In animals weighing close to 500 g, more PAS+ cells than AB+ cells were observed, and in animals that weighed more than 1,000 g, more AB+ cells than PAS+ cells were observed. These observations may be a result of the ontogenetic changes in the gill epithelia, which can change the osmorespiratory compromise in ion regulation functions as well the glycosaminoglycans secreted by PAS cells, which in large animals can play a role in the protection against parasites and bacterial infection. © 2018 Blackwell Verlag GmbH.

  14. Host specificity of Lepeophtheirus crassus (Wilson and Bere) (Copepoda: Caligidae) parasitic on the marlin sucker Remora osteochir (Cuvier) in the Atlantic Ocean.

    Science.gov (United States)

    Ho, Ju-shey; Collete, Bruce B; Madinabeitia, Ione

    2006-10-01

    Three species of remoras--Remora brachyptera (Lowe), Remora osteochir (Cuvier), and Remora remora (Linnaeus)--were collected from 4 species of billfishes--Istiophorus platypterus (Shaw), Makaira nigricans Lacepéde, Tetrapturus albidus Poey, and Tetrapturus pfluegeri Robins and de Sylva--on board a Japanese long-liner Shoyo Maru during her cruise in 2002 across the Atlantic. However, only the marlin sucker (R. osteochir) was found to carry a parasitic copepod, Lepeophtheirus crassus (Wilson and Bere, 1936). Although 12 species of parasitic copepods have been reported from billfishes around the world ocean, none of them is L. crassus. Thus, L. crassus is considered a parasite specific to the marlin sucker.

  15. The first finding of Asian black bear (Carnivora, Ursidae, Ursus (Euarctos) thibetanus G. Cuvier, 1823) in the Late Pleistocene of northern Eurasia.

    Science.gov (United States)

    Kosintsev, P A; Tiunov, M P; Gimranov, D O; Panov, V S

    2016-11-01

    An M1 tooth of Asian black bear (Ursus (Euarctos) thibetanus G. Cuvier, 1823) was found in deposits of the Tetyukhinskaya cave (Middle Sikhote-Alin, 44°35'N, 135°36'E). This finding is the first reliable evidence of Asian black bear's presence in Pleistocene of Primorye. Its morphological and morphometric descriptions are given. The period of inhabitation of U. (E.) thibetanus determined based on the radiocarbon date obtained during the study of the tooth, is 39 874 ± 133 BP (NSK-850, UGAMS-21786), which corresponds to the middle of Marine Isotope Stage 3 (MIS 3) of Late Pleistocene. The composition of ancient theriofauna indicates the existence of wide variety of landscapes in Primorye in the middle of Late Pleistocene. A refugium of forest fauna, in which species of taiga, nemoral, and Central Asian mountain-forest theriocomplexes were present, was located in southern Primorye in Late Pleistocene.

  16. Chemical, physical and profile oceanographic data collected aboard NOAA Ship PISCES in the Gulf of Mexico from 2010-07-05 to 2010-08-14 in response to the Deepwater Horizon Oil Spill event (NODC Accession 0069111)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Chemical, physical and profile oceanographic data were collected aboard NOAA Ship PISCES in the Gulf of Mexico from 2010-07-05 to 2010-08-14 in response to the...

  17. Chemical, physical and profile oceanographic data collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-08-18 to 2010-09-02 in response to the Deepwater Horizon Oil Spill event (NODC Accession 0069112)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Chemical, physical and profile oceanographic data were collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-08-18 to 2010-09-02 in response to the...

  18. Chemical, physical and profile oceanographic data collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-09-09 to 2010-09-17 in response to the Deepwater Horizon Oil Spill event (NODC Accession 0069113)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Chemical, physical and profile oceanographic data were collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-09-09 to 2010-09-17 in response to the...

  19. NRDA-processed CTD data from NOAA Ship PISCES in the Gulf of Mexico, Cruise 5 Leg 1, collected from 2010-09-10 to 2010-09-17, associated with the Deepwater Horizon Oil Spill event (NCEI Accession 0130223)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Conductivity Temperature and Depth (CTD) measurements were collected aboard NOAA Ship Pisces, Cruise 05, to determine physical oceanographic parameters of the water...

  20. NRDA-processed CTD data from NOAA Ship PISCES in the Gulf of Mexico, Cruise 8 Leg 1, collected from 2010-12-02 to 2010-12-19, associated with the Deepwater Horizon Oil Spill event (NCEI Accession 0130228)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Conductivity Temperature and Depth (CTD) measurements were collected aboard NOAA Ship Pisces to determine physical oceanographic parameters of the water column, and...

  1. NRDA-processed CTD data from NOAA Ship PISCES in the Gulf of Mexico, Cruise 3 Leg 1, collected from 2010-08-06 to 2010-08-14, associated with the Deepwater Horizon Oil Spill event (NCEI Accession 0128212)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Conductivity Temperature and Depth (CTD) measurements were collected aboard NOAA Ship Pisces to determine physical oceanographic parameters of the water column, and...

  2. NRDA-processed CTD data from NOAA Ship PISCES in the Gulf of Mexico, Cruise 12 Leg 2, collected from 2011-09-20 to 2011-09-27, associated with the Deepwater Horizon Oil Spill event (NCEI Accession 0130083)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Conductivity Temperature and Depth (CTD) measurements were collected aboard NOAA Ship Pisces, Cruise 12, Leg 2, to determine physical oceanographic parameters of the...

  3. Chemical, physical, profile and other oceanographic data collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-09-25 to 2010-10-03 in response to the Deepwater Horizon Oil Spill event (NCEI Accession 0069114)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Chemical, physical, profile, imagery, laboratory analysis, sediment analysis and underway oceanographic data were collected aboard NOAA Ship Pisces in the Gulf of...

  4. Spectroscopic studies of carbon containing molecules and their break-up in PISCES-A

    International Nuclear Information System (INIS)

    Pospieszczyk, A.; Ra, Y.; Hirooka, Y.; Conn, R.W.; Goebel, D.M.; LaBombard, B.; Nygren, R.E.

    1989-12-01

    We have used the PISCES-A facility in order to study the behavior of carbon containing molecules in a representative plasma with parameters close to that of a tokamak boundary layer, CH 4 , C 2 H 2 , C 2 H 4 , CO, and CO 2 molecules were introduced through a slit aperture into a helium plasma and the radiation from these due to electronic excitation was spectrographically recorded. The imaging of the plasma onto the entrance slit of a 1.33m McPherson optical spectrometer was chosen in such a way that simultaneous information about spectral and spatial distribution of the emission could be obtained by an attached photographic camera and an optical multichannel analyser (OMA). The recorded spectra show that many features in previously obtained spectra from limiters originate -- beside from hydrocarbons -- from carbonoxides, which seem to play a major role in the transport of carbon and oxygen. It was also possible to calibrate the radiation intensity of several molecular bands versus the known molecular influx so that an absolute determination of these fluxes from the wall of a fusion device could be done. Measurements of the attenuation of the individual species were carried out, which describe the penetration of carbon, oxygen, and hydrogen atoms into a discharge by taking into account individual steps in the molecular breakup process. 36 refs., 35 figs

  5. Testing of beryllium marker coatings in PISCES-B for the JET ITER-like wall

    International Nuclear Information System (INIS)

    Widdowson, A.; Baldwin, M.J.; Coad, J.P.; Doerner, R.P.; Hanna, J.; Hole, D.E.; Matthews, G.F.; Rubel, M.; Seraydarian, R.; Xu, H.

    2009-01-01

    Beryllium has been chosen as the first wall material for ITER. In order to understand the issues of material migration and tritium retention associated with the use of beryllium, a largely beryllium first wall will be installed in JET. As part of the JET ITER-like wall, beryllium tiles with marker coatings are proposed as a diagnostic tool for studying the erosion and deposition of beryllium around the vessel. The nominal structure for these coatings is a ∼10 μm beryllium surface layer separated from the beryllium tile by a 2-3 μm metallic inter-layer. Two types of coatings are tested here; one with a nickel inter-layer and one with a copper/beryllium mixed inter-layer. The coating samples were deposited by DC magnetron sputtering at General Atomics and were exposed to deuterium plasma in PISCES-B. The results of this testing show that the beryllium/nickel marker coating would be suitable for installation in JET.

  6. Deuterium pumping and erosion behavior of selected graphite materials under high flux plasma bombardment in PISCES

    International Nuclear Information System (INIS)

    Hirooka, Y.; Conn, R.W.; Goebel, D.M.; LaBombard, B.; Lehmer, R.; Leung, W.K.; Nygren, R.E.; Ra, Y.

    1988-06-01

    Deuterium plasma recycling and chemical erosion behavior of selected graphite materials have been investigated using the PISCES-A facility. These materials include: Pyro-graphite; 2D-graphite weave; 4D-graphite weave; and POCO-graphite. Deuterium plasma bombardment conditions are: fluxes around 7 /times/ 10 17 ions s/sup /minus/1/cm/sup /minus/2/; exposure time in the range from 10 to 100 s; bombarding energy of 300 eV; and graphite temperatures between 20 and 120/degree/C. To reduce deuterium plasma recycling, several approaches have been investigated. Erosion due to high-fluence helium plasma conditioning significantly increases the surface porosity of POCO-graphite and 4D-graphite weave whereas little change for 2D-graphite weave and Pyro-graphite. The increased pore openings and refreshed in-pore surface sites are found to reduce the deuterium plasma recycling and chemical erosion rates at transient stages. The steady state recycling rates for these graphite materials can be also correlated to the surface porosity. Surface topographical modification by machined-grooves noticeably reduces the steady state deuterium recycling rate and the impurity emission from the surface. These surface topography effects are attributed to co-deposition of remitted deuterium, chemically sputtered hydrocarbon and physically sputtered carbon under deuterium plasma bombardment. The co-deposited film is found to have a characteristic surface morphology with dendritic microstructures. 18 ref., 4 figs., 1 tab

  7. pisces: Sparidae

    African Journals Online (AJOL)

    items, which combines the modified points method and the frequency of occurrence ... Studies on the feeding and breeding biology of D. sargus capensis to date refer to ...... habits of albacore, bluefin tuna, and bonito in California water. Calif.

  8. PISCES: SPARIDAE

    African Journals Online (AJOL)

    This constituted approximately 17 per cent of the total annual landings, which ... fish. As growth, length and age at sexual maturity and reproduction are essential for the ..... Handbook of computation for biological statistics offish populations. J.

  9. pisces: pomadasyidae

    African Journals Online (AJOL)

    PomadDsys commeT6onni (Lace~e 1802), the spotted grunter, occurs in the warmer water of the stoma) zumpti sp.n., a parasite of small carnivores and squirrels in Southern Africa (Ixodoidea: Ixodidae). J. Parasit. 60: 188-197. LEDGER, J A 1976. The arthropod parasites of vertebrates in Africa south of the Sahara (Ethio-.

  10. Observation and particle simulation of vaporized W, Mo, and Be in PISCES-B plasma for vapor-shielding studies

    Directory of Open Access Journals (Sweden)

    K. Ibano

    2017-08-01

    Full Text Available Interactions of Tungsten (W, Molybdenum (Mo, and Beryllium (Be vapors with a steady-state plasma were studied by the PISCES-B liner plasma experiments as well as Particle-In-Cell (PIC simulations for the understanding of vapor-shielding phenomena. Effective cooling of the plasma by laser-generated Be vapor was observed in PISCES-B. On the other hand, no apparent cooling was observed for W and Mo vapors. The PIC simulation explains these experimental observations of the difference between low-Z and high-Z vapors. Decrease of electron temperature due to the vapor ejection was observed in case of a simulation of the Be vapor. As for the W vapor, it was found that the plasma cooling is localized only near the wall at a higher electron density plasma (∼1019m−3. On the other hand, the appreciable plasma cooling can be observed in a lower density plasma (∼1018m−3 for the W vapor.

  11. PISCES 3DELK - a coupled Euler/Lagrange program for computing dynamic fluid-structure interactions in three dimensions

    International Nuclear Information System (INIS)

    Chu, H.Y.; Cowler, M.S.; Hancock, H.

    1983-01-01

    This paper describes the main features of PISCES 3DELK, a computer code that is used to solve complex three-dimensional fluid-structure interaction problems in reactor safety. These features include: an Eulerian finite difference scheme for calculating fluid flow and large distortions of solid media; a Langrange finite element scheme for calculating the response of thin structures; coupling of the Euler and Langrange schemes at fluid-structure interfaces. The code has been well validated and applied to a number of reactor safety analyses including blowdown in reactor primary vessels and components, and loadings on the secondary containment caused by a breach in the primary containment. Details of two analyses are presented in this paper. The first analysis is of blowdown in a pressurized water reactor caused by a cold leg break (the HDR experiment). Results of the PISCES 3DELK calculation are compared with results obtained by the K-FIX code. Agreement between the two calculations is good. The second analysis is of the depressurization caused by a feedwater pipe break in a steam generator of the CANDU reactor. Calculations have been performed which show that flexibility of internal components in the heat exchanger mitigate structural loadings. (orig.)

  12. DISCOVERY OF AN ULTRA-DIFFUSE GALAXY IN THE PISCES-PERSEUS SUPERCLUSTER

    Energy Technology Data Exchange (ETDEWEB)

    Martínez-Delgado, David; Grebel, Eva K. [Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12–14, D-69120 Heidelberg (Germany); Läsker, Ronald [Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany); Sharina, Margarita; Karachentsev, Igor D. [Special Astrophysical Observatory, Russian Academy of Sciences (Russian Federation); Toloba, Elisa; Romanowsky, Aaron J. [University of California Observatories, 1156 High Street, Santa Cruz, CA 95064 (United States); Fliri, Jürgen [Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200 La Laguna, Tenerife (Spain); Beaton, Rachael [The Observatories of the Carnegie Institutions for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Valls-Gabaud, David [LERMA, CNRS UMR 8112, Observatoire de Paris, 61 Avenue de l’Observatoire, F-75014 Paris (France); Chonis, Taylor S. [Department of Astronomy, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712 (United States); Forbes, Duncan A. [Center for Astrophysics and Supercomputing, Swinburne University, Hawthorn VIC 3122 (Australia); Gallego-Laborda, J. [Fosca Nit Observatory, Montsec Astronomical Park, Ager (Spain); Teuwen, Karel [Remote Observatories Southern Alpes, Verclause (France); Gómez-Flechoso, M. A. [Departamento de Matemática Aplicada (Biomatemática), Universidad Complutense de Madrid, E-28040 Madrid (Spain); and others

    2016-04-15

    We report the discovery of DGSAT I, an ultra-diffuse, quenched galaxy located 10.°4 in projection from the Andromeda galaxy (M31). This low-surface brightness galaxy (μ{sub V} = 24.8 mag arcsec{sup −2}), found with a small amateur telescope, appears unresolved in sub-arcsecond archival Subaru/Suprime-Cam images, and hence has been missed by optical surveys relying on resolved star counts, in spite of its relatively large effective radius (R{sub e}(V) = 12″) and proximity (15′) to the well-known dwarf spheroidal galaxy And II. Its red color (V − I = 1.0), shallow Sérsic index (n{sub V} = 0.68), and the absence of detectable Hα emission are typical properties of dwarf spheroidal galaxies and suggest that it is mainly composed of old stars. Initially interpreted as an interesting case of an isolated dwarf spheroidal galaxy in the local universe, our radial velocity measurement obtained with the BTA 6 m telescope (V{sub h} = 5450 ± 40 km s{sup −1}) shows that this system is an M31-background galaxy associated with the filament of the Pisces-Perseus supercluster. At the distance of this cluster (∼78 Mpc), DGSAT I would have an R{sub e} ∼ 4.7 kpc and M{sub V} ∼ −16.3. Its properties resemble those of the ultra-diffuse galaxies (UDGs) recently discovered in the Coma cluster. DGSAT I is the first case of these rare UDGs found in this galaxy cluster. Unlike the UDGs associated with the Coma and Virgo clusters, DGSAT I is found in a much lower density environment, which provides a fresh constraint on the formation mechanisms for this intriguing class of galaxy.

  13. Discovery of an Ultra-diffuse Galaxy in the Pisces--Perseus Supercluster

    Science.gov (United States)

    Martínez-Delgado, David; Läsker, Ronald; Sharina, Margarita; Toloba, Elisa; Fliri, Jürgen; Beaton, Rachael; Valls-Gabaud, David; Karachentsev, Igor D.; Chonis, Taylor S.; Grebel, Eva K.; Forbes, Duncan A.; Romanowsky, Aaron J.; Gallego-Laborda, J.; Teuwen, Karel; Gómez-Flechoso, M. A.; Wang, Jie; Guhathakurta, Puragra; Kaisin, Serafim; Ho, Nhung

    2016-04-01

    We report the discovery of DGSAT I, an ultra-diffuse, quenched galaxy located 10.°4 in projection from the Andromeda galaxy (M31). This low-surface brightness galaxy (μV = 24.8 mag arcsec-2), found with a small amateur telescope, appears unresolved in sub-arcsecond archival Subaru/Suprime-Cam images, and hence has been missed by optical surveys relying on resolved star counts, in spite of its relatively large effective radius (Re(V) = 12″) and proximity (15‧) to the well-known dwarf spheroidal galaxy And II. Its red color (V - I = 1.0), shallow Sérsic index (nV = 0.68), and the absence of detectable Hα emission are typical properties of dwarf spheroidal galaxies and suggest that it is mainly composed of old stars. Initially interpreted as an interesting case of an isolated dwarf spheroidal galaxy in the local universe, our radial velocity measurement obtained with the BTA 6 m telescope (Vh = 5450 ± 40 km s-1) shows that this system is an M31-background galaxy associated with the filament of the Pisces-Perseus supercluster. At the distance of this cluster (˜78 Mpc), DGSAT I would have an Re ˜ 4.7 kpc and MV ˜ -16.3. Its properties resemble those of the ultra-diffuse galaxies (UDGs) recently discovered in the Coma cluster. DGSAT I is the first case of these rare UDGs found in this galaxy cluster. Unlike the UDGs associated with the Coma and Virgo clusters, DGSAT I is found in a much lower density environment, which provides a fresh constraint on the formation mechanisms for this intriguing class of galaxy.

  14. Isolation and characterization of eight microsatellite loci from Galeocerdo cuvier (tiger shark and cross-amplification in Carcharhinus leucas, Carcharhinus brevipinna, Carcharhinus plumbeus and Sphyrna lewini

    Directory of Open Access Journals (Sweden)

    Agathe Pirog

    2016-05-01

    Full Text Available The tiger shark Galeocerdo cuvier (Carcharhinidae is a large elasmobranch suspected to have, as other apex predators, a keystone function in marine ecosystems and is currently considered Near Threatened (Red list IUCN. Knowledge on its ecology, which is crucial to design proper conservation and management plans, is very scarce. Here we describe the isolation of eight polymorphic microsatellite loci using 454 GS-FLX Titanium pyrosequencing of enriched DNA libraries. Their characteristics were tested on a population of tiger shark (n = 101 from Reunion Island (South-Western Indian Ocean. All loci were polymorphic with a number of alleles ranging from two to eight. No null alleles were detected and no linkage disequilibrium was detected after Bonferroni correction. Observed and expected heterozygosities ranged from 0.03 to 0.76 and from 0.03 to 0.77, respectively. No locus deviated from Hardy-Weinberg equilibrium and the global FIS of the population was of 0.04NS. Some of the eight loci developed here successfully cross-amplified in the bull shark Carcharhinus leucas (one locus, the spinner shark Carcharhinus brevipinna (four loci, the sandbar shark Carcharhinus plumbeus (five loci and the scalloped hammerhead shark Sphyrna lewini (two loci. We also designed primers to amplify and sequence a mitochondrial marker, the control region. We sequenced 862 bp and found a low genetic diversity, with four polymorphic sites, a haplotype diversity of 0.15 and a nucleotide diversity of 2 × 10−4.

  15. Propuesta de Programa Integral de Servicio al Cliente (PISC) como Gestión Estratégica en las Concesionarias Automotrices de la Ciudad de Guayaquil.

    OpenAIRE

    Guerrero Vargas,Tyrone

    2012-01-01

    El problema de investigación fundamenta en el efecto de un Programa Integral de Servicio Cliente a concesionarias automotrices en creación de una Cultura Organizacional hacia Servicio Cliente. Su objetivo general es describir características de concesionarias orientadas hacia una cultura organizacional de servicio cliente consecuencia del desarrollo de PISC. Con los resultados investigación se beneficiarán: clientes externos al recibir un Servicio Cliente Integral a nivel de to...

  16. On a New Species of Hysterothylacium (Nematoda: Anisakidae from Cauque mauleanum (Pisces: Atherinidae by Brightfield and Scanning Electron Microscopy

    Directory of Open Access Journals (Sweden)

    Torres Patricio

    1998-01-01

    Full Text Available Hysterothylacium geschei n. sp. (Nematoda, Anisakidae is described from the intestine of Cauque mauleanum (Steindachner (Pisces: Atherinidae from Lake Panguipulli (39º43'S; 72º13'W, Chile. Eleven (78.6% out of 14 fish were infected, with a mean intensity (range of 14.4 (1-55 worms. The new species can be differentiated from the two previously described species of freshwater fishes from South America by the presence of lateral alae, the number of caudal papillae, and the length of the spicules, oesophagus, intestinal caecum, distance vulva-anterior extremity and the length ratio intestinal caecum: ventricular appendix. From the fishes examined in Lake Panguipulli, including the introduced salmonid species Oncorhynchus mykiss (Walbaum and the authochthonous species Basilichthys australis Eigenmann (Atherinidae and Percichthys trucha (Valenciennes (Percichthyidae, only one specimen of P. trucha was found parasitized by a third-stage larva of this species.

  17. Structural studies of haemoglobin from pisces species shortfin mako shark (Isurus oxyrinchus) at 1.9 Å resolution

    Energy Technology Data Exchange (ETDEWEB)

    Ramesh, Pandian, E-mail: prms23@gmail.com [Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746 (Korea, Republic of); University of Madras, Maraimalai Campus (Guindy), Chennai 600 025 (India); Sundaresan, S. S.; Sathya Moorthy, Pon.; Balasubramanian, M.; Ponnuswamy, M. N. [University of Madras, Maraimalai Campus (Guindy), Chennai 600 025 (India)

    2013-11-01

    Shortfin mako shark haemoglobin adopts an unliganded deoxy T state conformation, which is shown from the quaternary structural features, interface interactions and heme binding sites of different subunits of haemoglobin with high-resolution X-ray data. Haemoglobin (Hb) is a tetrameric iron-containing protein that carries oxygen from the lungs to tissues and carbon dioxide from tissues back to the lungs. Pisces are the advanced aquatic vertebrates capable of surviving at wide depth ranges. The shortfin mako shark (SMS) is the pelagic, largest, fastest and most sophisticated species of the shark kingdom with well developed eyes. Mostly the pisces species are cold blooded in nature. Distinctly, the SMSs are warm-blooded animals with an advanced circulatory system. SMSs are capable of maintaining elevated muscle temperatures up to 33 K above the ambient water temperatures at a depth of 150–500 m. SMSs have a diverged air-breathing mechanism compared with other vertebrates. The haemoglobin molecule consists of four polypeptide chains, namely two α chains, each with 140 amino acids and two β chains each having 136 amino acids. The SMS Hb was found to crystallize in monoclinic space group P2{sub 1} using the hanging-drop vapour-diffusion method at room temperature. The crystal packing parameters for the SMS Hb structure contain one whole biological molecule in the asymmetric unit with a solvent content of 47%. The SMS Hb quaternary structural features interface–interface interactions and heme binding sites are discussed with different state Hbs and the results reveal that SMS Hb adopts an unliganded deoxy T state conformation.

  18. Structural studies of haemoglobin from pisces species shortfin mako shark (Isurus oxyrinchus) at 1.9 Å resolution

    International Nuclear Information System (INIS)

    Ramesh, Pandian; Sundaresan, S. S.; Sathya Moorthy, Pon.; Balasubramanian, M.; Ponnuswamy, M. N.

    2013-01-01

    Shortfin mako shark haemoglobin adopts an unliganded deoxy T state conformation, which is shown from the quaternary structural features, interface interactions and heme binding sites of different subunits of haemoglobin with high-resolution X-ray data. Haemoglobin (Hb) is a tetrameric iron-containing protein that carries oxygen from the lungs to tissues and carbon dioxide from tissues back to the lungs. Pisces are the advanced aquatic vertebrates capable of surviving at wide depth ranges. The shortfin mako shark (SMS) is the pelagic, largest, fastest and most sophisticated species of the shark kingdom with well developed eyes. Mostly the pisces species are cold blooded in nature. Distinctly, the SMSs are warm-blooded animals with an advanced circulatory system. SMSs are capable of maintaining elevated muscle temperatures up to 33 K above the ambient water temperatures at a depth of 150–500 m. SMSs have a diverged air-breathing mechanism compared with other vertebrates. The haemoglobin molecule consists of four polypeptide chains, namely two α chains, each with 140 amino acids and two β chains each having 136 amino acids. The SMS Hb was found to crystallize in monoclinic space group P2 1 using the hanging-drop vapour-diffusion method at room temperature. The crystal packing parameters for the SMS Hb structure contain one whole biological molecule in the asymmetric unit with a solvent content of 47%. The SMS Hb quaternary structural features interface–interface interactions and heme binding sites are discussed with different state Hbs and the results reveal that SMS Hb adopts an unliganded deoxy T state conformation

  19. Le faune et la sirène : la situation de Cuvier dans l’économie de The Marble Faun, de Nathaniel Hawthorne

    Directory of Open Access Journals (Sweden)

    Antoine Traisnel

    2012-06-01

    Full Text Available Nathaniel Hawthorne’s The Marble Faun ends with one character’s polite refusal to satisfy the narrator’s curiosity concerning young Donatello’s possible animality. When asked if Donatello’s ears are as pointy as those of the book’s titular figure, the Faun of Praxiteles, Kenyon smiles inscrutably and responds: “On that point, at all events, there shall be no word of explanation.” On that “point” – that of Donatello’s ears—the author remains obstinately tight-lipped, having “hoped to mystify this anomalous creature between the Real and the Fantastic […] without impelling him to ask how Cuvier would have classified poor Donatello.” The disclosure of a small anatomical detail threatens to shatter the whole edifice of Hawthorne’s fiction. The point in question here, however, is not just the extremity that makes measurement possible but also the ungraspable limit (the punctum that undoes the logic of Cuvierian classification. Analyzing the metrics of The Marble Faun, my paper will query how the romance envisions the vanishing point of the human/animal relation.The Marble Faun s’achève sur le refus poli d’un personnage qui renâcle à satisfaire la curiosité du narrateur. Quand celui-ci lui demande si les oreilles du jeune Donatello sont aussi pointues que celles du Faune de Praxitèle, Kenyon sourit mystérieusement et répond : « On that point, at all events, there shall be no word of explanation. » Sur ce point, ou plutôt sur la pointe des oreilles de Donatello, l’« auteur » reste muet dans l’espoir, écrit-il, de situer cette créature aberrante « entre le réel et le fantastique » sans avoir à spécifier la place qu’elle occupe au sein de la taxonomie établie par Cuvier. La divulgation d’un petit détail anatomique menace de faire imploser l’édifice de la fiction hawthornienne. Le point en question, cependant, n’est pas simplement l’extrémité à partir de laquelle l

  20. Caracterización citogenética del pez neotropical Brycon henni (Pisces: Characidae

    Directory of Open Access Journals (Sweden)

    Diana David López

    2008-12-01

    Full Text Available La sabaleta Brycon henni, es un pez nativo del occidente colombiano importante para la seguridad alimentaria de las poblaciones ribereñas y para la pesca deportiva por sus característica combativas. El desarrollarse entre los 18 y 28ºC la convierte en una especie de cultivo promisoria. Un estudio citogenético a partir de células branquiales indicó diferentes complementos cromosómicos. Este trabajo aplicó la técnica de cultivo de linfocitos a muestras de sangre de adultos. Las muestras de sangre total fueron sembradas en 4 ml de medio de cultivo Ham-F12, suplementado con 0.5 ml de Suero Fetal Bovino y 0.7 ml del mitógeno Fitohemaglutinina M (Gibco® durante 96 hr a 28ºC; 1.5 hr antes de la cosecha agregamos 100µl de Colcemid al 10% como factor antimitótico. Cada cultivo se incubó con 10 ml de solución hipotónica KCl 0.56% por 24 min a 37ºC, para continuar con tres fijaciones sucesivas, centrifugaciones y tinción Giemsa al 5%. Las mejores metafases fueron fotografiadas en microscopio, correspondientes a 6 machos y 8 hembras, indicando un número diploide de 50 cromosomas, clasificados en Metacéntricos (26M, Submetacéntricos (16SM y Subtelocéntricos (8ST, para un número fundamental (NF de 100 brazos. La tendencia evolutiva hallada fue de tipo B; no se encontraron cromosomas supernumerarios pero sí un primer par de cromosomas metacéntricos grandes, considerado marcador para el género Brycon, no determinante de heteromorfismo sexual. Estos resultados coinciden con los demás bricónidos investigados, en donde se podría considerar un ancestro común con un número cromosómico básico y cariotipos simétricos.Cytogenetic characterization of the neotropical fish Brycon henni (Pisces: Characidae. Brycon henni, is a native fish from Western Colombia is important as food and in sport fishing, and could be cultured in waters between 18 and 28ºC. A previous cytogenetic study in branchial cells indicated different chromosomal

  1. Desarrollo embrionariolarval y tiempo de metamorfosis del pez tropical Xenomelaniris brasiliensis (Pisces: Atherinidae

    Directory of Open Access Journals (Sweden)

    Veronica del Río

    2005-09-01

    Full Text Available Se describe el desarrollo embrionario y larval hasta la metamorfosis de Xenomelaniris brasiliensi. Un total de 29 ejemplares sexualmente maduros, 16 hembras (10.86 ± 1.01 cm y 7.63 ± 2.62 g y 13 machos (10.43 ± 0.57 cm y 6.54 ± 1.44 g, liberaron sus productos sexuales mediante masaje abdominal. Los huevos fértiles fueron esféricos de 1.18 ± 0.44 mm de diámetro, verdosos, translúcidos, bentónicos, ricos en vitelo, corion rugoso y estriado, con numerosos filamentos coriónicos, distribuidos aleatoriamente por toda la superficie externa y numerosas gotas lipídicas con un diámetro de 0.11 ± 0.07 mm. El desarrollo embrionario se realizó a 26.36 ± 2.03 ºC, 39.67 ± 0.58 PSU y pH 8.30 ± 0.10 eclosionando larvas de 4.56 ± 0.97 mm a las 143 hrs: 19 min, con vestigios del saco vitelino y una gota lipídica interna. Las larvas fueron alimentadas diariamente con Brachionus plicatilis e Isochrysis galbana, a partir de la segunda semana se incorporó nauplios de Artemia, manteniendo la adición diaria de I. galbana. A los 13 días después de la eclosión de larvas (6.10 ± 1.54 mm se inició la flexión, completándose a los 32 días (11.25 ± 1.87 mm con un complejo hipural completamente desarrollado. Se concluye que X. brasiliensis presentó desarrollo larval directo, iniciándose la metamorfosis de larva (13.08 ± 2.07 a juvenil a los 40 días de edad.Development of the tropical fish Xenomelaniris brasiliensis (Pisces: Atherinidae from embryo to larva and time to metamorphosis. Embryoniclarval development, and metamorphosis larval time, were studied in the tropical fish Xenomelaniris brasiliensis. Twenty nine sexually mature specimens were used, 16 females (10.86 ± 1.01 cm and 7.63 ± 2.62 g and 13 males (10.43 ± 0.57 cm and 6.54 ± 1.44 g which produced gametes through abdominal massage. Fertilized eggs were spherical (1.18 ± 0.44 mm diameter, greenish, transparent, benthonic and vitelusrich; rugose striated chorion with numerous

  2. Distribuição espacial e temporal de Cetengraulis edentulus (Cuvier (Actinopterygii, Engraulidae na Baía de Sepetiba, Rio de Janeiro, Brasil Spatial and temporal distribution of Cetengraulis edentulus (Cuvier (Actinopterygii-Engraulidae in the Sepetiba Bay, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Márcio de Araújo Silva

    2003-12-01

    Full Text Available Anchovies are members of the Engraulidae family, characterized to present coastal pelagic habits, concentrating in large schoolings distributed among the continental shelf and semi-closed environment, like bays, where they are target of heavy fisheries. The present study aims to describe spatial and temporal distribution of Cetengraulis edentulous (Cuvier, 1828 in the Sepetiba bay (22º54'-23º04'S, 43º34'-44º10'W and to assess influences of environmental variables on fish occurrence. A monthly sampling programme was carried out between October 1998 and September 1999, to take both, fish and environmental information on temperature, salinity and depth. Three bay zones were established based on spatial gradient of salinity and depth. Adults C. edentulus were more abundant in the inner bay zone; seasonally, larger size groups (total length > 16 cm occurred in spring/summer. Significant negative correlations were found between fish abundance and salinity and depth. The close relationship of this species to innermost areas in bays, and the absence of juveniles in sandy beaches, suggest that young-of-the-year use mangrove areas as recruitment sites.

  3. A proposal for a pharmacokinetic interaction significance classification system (PISCS) based on predicted drug exposure changes and its potential application to alert classifications in product labelling.

    Science.gov (United States)

    Hisaka, Akihiro; Kusama, Makiko; Ohno, Yoshiyuki; Sugiyama, Yuichi; Suzuki, Hiroshi

    2009-01-01

    Pharmacokinetic drug-drug interactions (DDIs) are one of the major causes of adverse events in pharmacotherapy, and systematic prediction of the clinical relevance of DDIs is an issue of significant clinical importance. In a previous study, total exposure changes of many substrate drugs of cytochrome P450 (CYP) 3A4 caused by coadministration of inhibitor drugs were successfully predicted by using in vivo information. In order to exploit these predictions in daily pharmacotherapy, the clinical significance of the pharmacokinetic changes needs to be carefully evaluated. The aim of the present study was to construct a pharmacokinetic interaction significance classification system (PISCS) in which the clinical significance of DDIs was considered with pharmacokinetic changes in a systematic manner. Furthermore, the classifications proposed by PISCS were compared in a detailed manner with current alert classifications in the product labelling or the summary of product characteristics used in Japan, the US and the UK. A matrix table was composed by stratifying two basic parameters of the prediction: the contribution ratio of CYP3A4 to the oral clearance of substrates (CR), and the inhibition ratio of inhibitors (IR). The total exposure increase was estimated for each cell in the table by associating CR and IR values, and the cells were categorized into nine zones according to the magnitude of the exposure increase. Then, correspondences between the DDI significance and the zones were determined for each drug group considering the observed exposure changes and the current classification in the product labelling. Substrate drugs of CYP3A4 selected from three therapeutic groups, i.e. HMG-CoA reductase inhibitors (statins), calcium-channel antagonists/blockers (CCBs) and benzodiazepines (BZPs), were analysed as representative examples. The product labelling descriptions of drugs in Japan, US and UK were obtained from the websites of each regulatory body. Among 220

  4. Dissolved inorganic carbon, pH, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from NOAA Ship PISCES in the North Atlantic Ocean from 2012-10-27 to 2012-11-13 (NCEI Accession 0157447)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NCEI Accession 0157447 includes chemical, discrete sample, physical and profile data collected from NOAA Ship PISCES in the North Atlantic Ocean from 2012-10-27 to...

  5. Oceanographic data collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-07-15 to 2010-07-21 in response to the Deepwater Horizon Oil Spill event (NODC Accession 0084593)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Oceanographic data were collected aboard NOAA Ship Pisces in the Gulf of Mexico from 2010-07-15 to 2010-07-21 in response to the Deepwater Horizon Oil Spill event on...

  6. Diseño de una herramienta de evaluación del desempeño ambiental en las granjas piscícolas

    OpenAIRE

    Pardo, Sandra; Suárez, Héctor; Jardim-Manso, Paulo; Soriano-Sierra, Eduardo

    2005-01-01

    Con el objetivo de evaluar el desempeño ambiental de las empresas piscícolas, se diseñó y aplicó una herramienta basada en las listas de chequeo la cuál fue elaborada a partir de las recomendaciones dadas por la FAO en su código de conducta para una acuicultura responsable, en las guías de organizaciones no gubernamentales que buscan el desarrollo de una acuicultura responsable y de modificaciones a las propuestas metodológicas de Vinatea (1999) y Leripio (2003). La aplicación por entrevista ...

  7. Comorbidity, Pain, Utilization, and Psychosocial Outcomes in Older versus Younger Sickle Cell Adults: The PiSCES Project

    Directory of Open Access Journals (Sweden)

    Donna K. McClish

    2017-01-01

    Full Text Available Background. Patients with SCD now usually live well into adulthood. Whereas transitions into adulthood are now often studied, little is published about aging beyond the transition period. We therefore studied age-associated SCD differences in utilization, pain, and psychosocial variables. Methods. Subjects were 232 adults in the Pain in Sickle Cell Epidemiology Study (PiSCES. Data included demographics, comorbidity, and psychosocial measures. SCD-related pain and health care utilization were recorded in diaries. We compared 3 age groups: 16–25 (transition, 26–36 (younger adults, and 37–64 (older adults years. Results. Compared to the 2 adult groups, the transition group reported fewer physical challenges via comorbidities, somatic complaints, and pain frequency, though pain intensity did not differ on crisis or noncrisis pain days. The transition group utilized opioids less often, made fewer ambulatory visits, and had better quality of life, but these differences disappeared after adjusting for pain and comorbidities. However, the transition group reported more use of behavioral coping strategies. Conclusion. We found fewer biological challenges, visits, and better quality of life, in transition-aged versus older adults with SCD, but more behavioral coping. Further study is required to determine whether age-appropriate health care, behavioral, or other interventions could improve age-specific life challenges of patients with SCD.

  8. Setting Conservation Priorities in a Widespread Species: Phylogeographic and Physiological Variation in the Lake Chub, Couesius plumbeus (Pisces: Cyprinidae

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    Patricia M. Schulte

    2013-04-01

    Full Text Available Defining units of conservation below the species level is a widely accepted conservation priority, but is especially challenging for widespread taxa that have experienced diverse geographic histories and exist across heterogenous environments. The lake chub (Pisces: Couesius plumbeus is a widespread freshwater fish in North America and occurs from the southcentral USA to northwestern Alaska and Canada. We used mtDNA sequence analysis to test for divergent lineages predicted to occur as a result of survival of lake chub in distinct glacial refugia. Lake chub consisted of two major mtDNA lineages separated by 3.8% sequence divergence which are probably late to pre-Pleistocene in origin. We combined these data with those consistent with thermal adaptation in fish living in thermal springs versus those living in a lake with wide seasonal temperature variation, and with data on distribution of lake chub in major watershed units. We assessed these data against objective criteria developed to identify conservation units under Canadian endangered species legislation. Our analysis identified twelve major units of conservation within C. plumbeus that could be assessed under Canada’s Species-at-Risk Act. Our study illustrates how different character traits manifested at very different spatial scales can be used to define conservation units within widely-distributed taxa.

  9. Croissance de Auchenoglanis occidentalis (Pisces, Claroteidae dans le Delta Central du Niger (Mali, Afrique de l'ouest

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    Niaré, T.

    2013-01-01

    Full Text Available Growth of Auchenoglanis occidentalis (Pisces, Claroteidae in the Central Delta of Niger River Flood Plain (Mali, West Africa. Growth biology of Auchenoglanis occidentalis (Valenciennes, 1840 is studied from individuals monthly sampled on two different annual cycles (1991 and 1997 in the fishing port of Mopti. Individual age of fishes was determined by squelettochronology. Chronological follow-up of relative margin diameter (dr of spine ray section was used for validation of the periodicity of annulus formation. Only one annulus is formed annually. Period of growth recovery shows an individual variability with an early starting up from the lowwater level, in May. The seasonal cycle of growth of this benthic fish, A. occidentalis, depends more on the availability of the trophic resources than of abiotic factors. However, the optimal period of growth always remains the high-water one in this river with flood plain. Fishes condition factor's varies between 1.97±0.27 à 2.57±0.41. Year x season interaction affects this parameter. Growth realized during the first year (189.17±4.57 and 261.25±12.19 mm as well as the later growths depend on hydrological conditions and are influenced by fishing pressure. Presence of 3+ age class fishes shows that demographic structure is not qualitatively modified despite changes arisen in the Delta.

  10. SITUACIÓN DE Menidia jordani (Pisces: Atherinopsidae EN EL EMBALSE LA GOLETA, ESTADO DE MÉXICO

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    N. A. Navarrete-Salgado

    2010-01-01

    Full Text Available En este estudio se analiza la situación del charal Menidia jordani (Pisces, Atherinopsidae en el embalse La Goleta, Estado de México y las variaciones poblacionales desde 1998, cuando se registró por primera vez en el embalse. Para ello se realizaron visitas en 1998, 2007 y 2008 durante las épocas secas y de lluvias. Los peces fueron capturados con un chinchorro charalero de 30.0 m de largo, 1.5 m de caída y 8.0 mm de abertura de malla, fijados con formalina al 10 %, llevados al laboratorio e identificados. Los resultados muestran que la mayor abundancia de M. jordani se registró en 1998 (3,000 peces·1000 m-2, mientras que la menor abundancia se presentó en 2008 (5 orgs.·1000 m-2. Se concluye que estas variaciones están en función de la presencia de especies exóticas como la carpa común (Cyprinus carpio y la carpa dorada (Carassius auratus, con las cuales compite, asimismo, la presencia de una especie carnívora (Micropterus salmoides afecta la población del charal en el embalse. El céstodo (Bothriocephalus acheilognathi, influyó en la disminución de este pez y el vertido de aguas negras hacia este sistema afectaron también su abundancia.

  11. Cultivo de Poecilia reticulata (Pisces:Poecilidae en cuerpos de agua tropicales,Veracruz,México

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    Patricia Devezé Murillo

    2004-12-01

    el productor en comparación con sistemas tradicionales de producción.Culture of Poecilia reticulata (Pisces:Poecilidaein tropical water bodies, Veracruz, México. Poecilia reticulata,also known as guppy,is the most popular fish in the aquarium environment. Guppys are viviparous fish with high tolerance to extreme temperatures.The development of the offspring takes between 25 and 30 days.We developed a technology for raising guppys,which outlines infrastructure and devices for reproduction,nursery,feeding,and commercialization,evaluating the financial and technical feasibility of this technology in a case study.The complete reproductive cycle occured in floating cages with 1 mm mesh and the method was tested in a tropical lagoon in Mexico.Water quality was monitored throughout the study period (temperature,dissolved oxygen and pH levels.A marketing survey was carried out at all existing aquarium shops in Veracruz City.Data collected depict quantities demanded and offered for each species by season,place of origin,and resistance to handling.The hydrobiological characteristics were:average temperature 31.4 ºC, dissolved oxygen 4.5 mgl-1,and pH level 6.8.With these values we built a production function,and used it to evaluate profitability.We estimate a benefit/cost ratio of 1.16,with a net annual income of US$257.67.The system may provide two permanent jobs.Rev.Biol.Trop.52(4:951-958.Epub 2005 Jun 24.

  12. Atmospheric deposition impacts on nutrients and biological budgets of the Mediterranean Sea, results from the high resolution coupled model NEMOMED12/PISCES

    Science.gov (United States)

    Richon, Camille; Dutay, Jean-Claude; Dulac, François; Desboeufs, Karine; Nabat, Pierre; Guieu, Cécile; Aumont, Olivier; Palmieri, Julien

    2016-04-01

    Atmospheric deposition is at present not included in regional oceanic biogeochemical models of the Mediterranean Sea, whereas, along with river inputs, it represents a significant source of nutrients at the basin scale, especially through intense desert dust events. Moreover, observations (e.g. DUNE campaign, Guieu et al. 2010) show that these events significantly modify the biogeochemistry of the oligotrophic Mediterranean Sea. We use a high resolution (1/12°) version of the 3D coupled model NEMOMED12/PISCES to investigate the effects of high resolution atmospheric dust deposition forcings on the biogeochemistry of the Mediterranean basin. The biogeochemical model PISCES represents the evolution of 24 prognostic tracers including five nutrients (nitrate, ammonium, phosphate, silicate and iron) and two phytoplankton and zooplanktons groups (Palmiéri, 2014). From decadal simulations (1982-2012) we evaluate the influence of natural dust and anthropogenic nitrogen deposition on the budget of nutrients in the basin and its impact on the biogeochemistry (primary production, plankton distributions...). Our results show that natural dust deposition accounts for 15% of global PO4 budget and that it influences primarily the southern part of the basin. Anthropogenic nitrogen accounts for 50% of bioavailable N supply for the northern part. Deposition events significantly affect biological production; primary productivity enhancement can be as high as 30% in the areas of high deposition, especially during the stratified period. Further developments of the model will include 0D and 1D modeling of bacteria in the frame of the PEACETIME project.

  13. Crack sizing by the time-of-flight diffraction method, in the light of recent international round-robin trials, (UKAEA, DDT and PISC II)

    International Nuclear Information System (INIS)

    Curtis, G.J.

    1987-01-01

    In 1980-81, Harwell developed a mini-computer controlled multi-probe defect detection and sizing system based on the ultrasonic time-of-flight/diffraction principle introduced by Silk. This system proved to be capable of fully automatic data collection from the PWR girth-weld simulation Plates 1 and 2 in the Defect Detection Trials of 1981-82. The speed of collection and subsequent analysis was such that a report on the defects found could be filed within 48 hours. The mode of operation adopted simulated minimum time of access to the defects, and was intended to define that dimension of a defect which has greatest significance, i.e. the through-thickness dimension. In 1984, for the PISC II Trial, the approach adopted changed to emphasize the three-dimensional location and sizing capabilities of the time-of-flight/diffraction method. Data collection and analysis became highly interactive and the mode of operation simulated NDE at the manufacturing stage of a pressure vessel. The purpose of this paper is to indicate the defect through-thickness sizing capability of TOFD achieved in the 1981-82 Defect Detection Trials and the defect mapping capability achieved in the 1984 PISC II Trial

  14. Abundance, feeding and reproduction of Salminus sp. (Pisces: Characidae from mountain streams of the Andean piedmont in Venezuela

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    Douglas Rodríguez-Olarte

    Full Text Available To obtain basic information for management, aspects of the ecology of Salminus sp. (Pisces: Characidae, were studied in piedmont rivers of the southwestern flank of the Andes in Venezuela. Collections were made with seines of various lengths and mesh sizes, and both underwater and terrestrial observations were recorded to estimate abundance and feeding events. Interviews with local fishermen and inhabitants were made to obtain data on use. The species is present along the entire length of the Andean piedmont in Venezuela, although in some rivers it is now scarce. Small individuals form mixed schools with Brycon whitei, but larger Salminus sp. usually only school with others of the same species. Average abundance was greater in larger rivers, and didn't vary appreciably with season for any of the rivers studied. Size and weight ranged from 15.1 to 40.5 cm SL and 47.7 to 1,210 g, respectively. Females had maximum ovary maturity at the beginning of the rainy season, with an average fecundity of 35,834 eggs, and spawning occurred during spates of high water. Feeding was crepuscular, with most events recorded during the first and last hours of sunlight. In smaller fish up to 20 cm SL, the diet was varied, but above that size fish were the principal food item. Salminus sp. has little commercial importance in this region but forms an important part of the local subsistence fishery, and occasionally it is targeted for sport fishing. The minimum legal size of capture for the species should be raised, since the current limit permits the capture of many sexually immature individuals.

  15. Extending ALFALFA in the Direction of the Pisces-Perseus Supercluster with the Arecibo L-Band Wide Receiver

    Science.gov (United States)

    O'Donoghue, Aileen A.; Haynes, Martha P.; Koopmann, Rebecca A.; Jones, Michael G.; Hallenbeck, Gregory L.; Giovanelli, Riccardo; Hoffman, Lyle; Craig, David W.; Undergraduate ALFALFA Team

    2017-01-01

    We have completed three “Harvesting ALFALFA” Arecibo observing programs in the direction of the Pisces-Perseus Supercluster (PPS) since ALFALFA observations were finished in 2012. The first was to perform follow-up observations on high signal-to-noise (S/N > 6.5) ALFALFA detections needing confirmation and low S/N sources lacking optical counterparts. A few more high S/N objects were observed in the second program along with targets visually selected from the Sloan Digital Sky Survey (SDSS). The third program included low S/N ALFALFA sources having optical counterparts with redshifts that were unknown or differed from the ALFALFA observations. It also included more galaxies selected from SDSS by eye and by Structured Query Language (SQL) searches with parameters intended to select galaxies at the distance of the PPS (~6,000 km/s). We used pointed basic Total-Power Position-Switched Observations in the 1340 - 1430 MHz ALFALFA frequency range. For sources of known redshift, we used the Wideband Arecibo Pulsar Processors (WAPP’s) , while for sources of unknown redshift we utilized a hybrid/dual bandwidth Doppler tracking mode using the Arecibo Interim 50-MHz Correlator with 9-level sampling.Results confirmed that a few high S/N ALFALFA sources are spurious as expected from the work of Saintonge (2007), low S/N ALFALA sources lacking an optical counterpart are all likely to be spurious, but low S/N sources with optical counterparts are generally reliable. Of the optically selected sources, about 80% were detected and tended to be near the distance of the PPS.This work has been supported by NSF grant AST-1211005.

  16. Variables ambientales y abundancia de los huevos de Anchoa mitchilli (Pisces: Engraulidae en la laguna de Tamiahua, México

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    Carlos Díaz-Avalos

    2003-06-01

    Full Text Available Se estudió la abundancia de huevos de Anchoa mitchilli (Cuvier y Valenciennes 1848 en la laguna de Tamiahua, Ver. durante tres ciclos anuales (84-85, 85-86 y 86-87, para determinar zonas y épocas de alta concentración de huevos y su posible asociación con variables como temperatura, salinidad, transparencia y profundidad, así como con factores espacio-temporales como posición geográfica, época climática y el ciclo anual de recolecta. Para probar estadísticamente la asociación de la abundancia de huevos con dichos factores y variables se ajusto un Modelo Lineal Generalizado (MLG con error tipo Gamma. Los resultados del modelo ajustado sugieren que no todas las variables tienen un efecto significativo sobre la abundancia de huevos (t de Student, p >0.05. Las variables que resultaron estadísticamente significativas indican la presencia de un componente estacional y que la salinidad tiene un efecto condicional a la localidad. Las mayores abundancias promedio durante los tres ciclos de recolecta ocurrieron siempre durante el verano. Asimismo, debido a la presencia de interacciones significativas (t de Student, pEgg abundance of Anchoa mitchilli was studied in Laguna de Tamiahua, Veracruz during three annual cycles (84-85, 85-86 and 86-87. Our goal was to detect areas and seasons with high egg abundance and the possible association of such areas and seasons with covariates such as temperature, salinity, transparency, depth, location, season and year. The association was tested statistically using a Generalized Linear Model (GLM with Gamma type error. The results suggest that not all the covariates considered have a significant effect on egg abundance (Student’s T, p>0.005. The significant effects show the presence of a seasonal component and that the effect of salinity on egg abundance is conditional to location. High average egg abundances for the three annual cycles were observed during summer. The presence of significant interactions

  17. Las infracomunidades de parásitos de dos especies de Scartichthys (Pisces: Blenniidae en localidades cercanas del norte de Chile Parasite infracommunities of two blennid species, Scartichthys (Pisces: Blenniidae, at nearby localities off northern Chile

    Directory of Open Access Journals (Sweden)

    KAREN FLORES

    2009-03-01

    Full Text Available Se comparan las infracomunidades de parásitos de dos especies congenéricas y simpátridas de peces marinos: Scartichthys viridis (Valenciennes 1836 y Scartichthys gigas (Steindachner 1876 (Pisces: Blenniidae, en tres localidades del intermareal rocoso de Iquique (20°32' S, 70°11' O, norte de Chile, separadas por no más de 6 km, con muestras recolectadas entre agosto y septiembre de 2005. El objetivo fue evaluar la variabilidad de la riqueza, abundancia, diversidad, dominancia y composición en una escala espacial y temporal reducida. En total, se recolectaron 2.110 individuos parásitos en los 134 hospedadores examinados, los que pertenecían a 14 taxa. Se encontró una gran similitud en la composición y en las propiedades agregadas de las infracomunidades, tanto entre especies de hospedadores como entre sitios de estudio. Se interpreta que las condiciones ambientales, los factores ecológicos como el uso del habitat y de los recursos alimentarios, y los factores evolutivos como el alto grado de parentesco de estas especies de Scartichthys, son las principales influencias en la alta similitud parasitaria encontrada.The infracommunities of metazoan parasites in two congeneric and sympatric marine fish species, Scartichthys viridis (Valenciennes 1836 and Scartichthys gigas (Steindachner 1876, were studied and compared between three localities of the intertidal rocky shore off the coast of northern Chile, near Iquique (20°32' S, 70°11' W, which were separated by no more than 6 km. Samples were collected between August and September 2005. The goal of this study was to assess the variability in richness, abundance, diversity, dominance and parasite composition between close localities sampled within a short period. In all, 2,110 parasite individuals were collected from the 134 hosts examined, and 14 parasite taxa were identified. There was great similarity in the aggregated and compositional properties of the infracommunities, both between

  18. Reproductive dynamics of Lycengraulis grossidens (Clupeiformes: Engraulidae and Platanichthys platana (Clupeiformes: Clupeidae in a subtropical coastal lagoon

    Directory of Open Access Journals (Sweden)

    C. A. Lopes

    2017-11-01

    Full Text Available Abstract We evaluated the reproductive dynamics of two fish species, Lycengraulis grossidens and Platanichthys platana, in a subtropical freshwater coastal lagoon (Peri Lagoon in Brazil. Samples were collected from nine sites every two months from June 2008 to April 2012. Different fishing methods were used to capture larvae, juveniles, and adults. Limnological variables were obtained using multiparameter probe. More females than males were collected of both fish species and the chi-square test (χ2 was used to confirm that the sex ratio was female-biased. Large numbers of maturing and mature fishes were observed in almost every sampling month. The gonadosomatic index (GSI of L. grossidens was the highest in August, October, and December for females and in October for males, and no significant difference was found across years. The GSI of P. platana showed no significant difference across months for either sex; however, significant differences were recorded in year three (June 2010-April 2011 and year four (June 2011-April 2012 for females and in year three (June 2010-April 2011 for males. For both species, GSI was negatively correlated with temperature and water level. L. grossidens larvae were more abundant in October 2010, showing a positive correlation with water transparency, whereas P. platana larvae were more abundant in June 2011, showing a positive correlation with water transparency and negative correlation with temperature and precipitation. Both species were represented by different stages, including larvae, which confirm that these species reproduce in Peri Lagoon. Reproduction was more pronounced in autumn and winter; however, reproductive activity was evident throughout the sampling period. In conclusion, our results show that abiotic factors strongly influence the temporal pattern of reproductive activity and larval assemblages of both L. grossidens and P. platana in Peri Lagoon, Brazil.

  19. Possible Threat for Middle East Inland Water: an Exotic and Invasive Species, Pterygoplichthys disjunctivus (Weber, 1991) in Asi River, Turkey (Pisces: Loricariidae).

    OpenAIRE

    Şükran Yalçın Özdilek

    2015-01-01

    Ortadoğu iç suları için muhtemel tehdit: Asi Nehri’nde egzotik ve işgalci bir tür Pterygoplichthys disjunctivus (Weber, 1991) (Pisces: Loricariidae). Pterygoplichthys disjunctivus bireyleri Güney Amerika kökenli olup, bu egzotik ve işgalci türü bireyleri Kuzey Amerika ve Uzakdoğu ülkelerine dağılmışlardır. Orta Doğu’da yer alan Asi Nehri’nin Türkiye sınırları dahilinde daha önce kayıtlarda bulunmayan bir P. disjunctivus bireyi yakalanmıştır. P. disjunctivus Asi Nehri’nde potansiyel olarak işg...

  20. Caraterización citogenética del pez tropical de agua dulce Parachromis managuensis (Pisces:Cichlidae

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    Lenin Arias-Rodriguez

    2006-03-01

    Full Text Available Para contribuir con el ordenamiento de las especies de la familia Cichlidae, se realizó el estudio citogenético de la mojarra pinta Parachromis managuensis. Fueron utilizados veintiún organismos, ocho machos y trece hembras,colectados en Villahermosa, Tabasco, México. Los especímenes se procesaron por técnicas citogenéticas convencionales (con ligeras modificaciones. Se obtuvieron campos mitóticos y meióticos de buena calidad, de los que fueron seleccionados catorce cariotipos para ser analizados merística y estadísticamente. Los especímenes presentaron número modal diploide de 2n=48 cromosomas, similar al reportado para otros cíclidos neotropicales. Cinco pares fueron cromosomas metacéntricos-submetacéntricos (birrámeos y 19 pares cromosomas subtelocéntricos-telocéntricos (monorrámeos,con número fundamental (NF de 58 brazos.El número haploide se ratificó por conteo de campos meióticos en metafase I. Los campos mitóticos observados y los cariotipos de machos y hembras no presentaron evidencias heteromórficas para identificar cromosomas sexuales.Citogenetic characterization of the tropical freshwater fish Parachromis managuensis (Pisces: Cichlidae. To describe the cytogenetics of the jaguar cichlid fish Parachromis managuensis, we collected eight males and 13 females in Villahermosa, Tabasco, México. The specimens were processed with standard cytogenetic techniques (slightly modified, and high quality fields of chromosomes in mitosis and meiosis were obtained; 14 of these fields were analyzed by meristics and statistics methods. The specimens presented a diploid modal number of 2n=48 chromosomes, which is similar to the number reported for others Central American cichlids; five pairs were submetacentric-metacentrics(biarmedand 19 were subtelocentric-telocentric (uni-armed,giving a fundamental number (NFof 58.The haploid number was confirmed by counting meiotic fields in metaphase I. There was not evidence of

  1. Reproducción de la morena, Gymnothorax equatorialis (Pisces: Muraenidae en Jalisco y Colima, México

    Directory of Open Access Journals (Sweden)

    G Lucano-Ramírez

    2008-03-01

    Full Text Available Con el fin de analizar los aspectos reproductivos de Gymnothorax equatorialis se recolectaron mensualmente 707 organismos en las costas de Jalisco y Colima, México, de diciembre de 1995 a diciembre de 1998 y de agosto a diciembre de 1999. Las hembras fueron más numerosas y presentaron una longitud (54.7 cm mayor a la de los machos (52.1 cm. La fecundidad total mínima fue de 9 660 huevos, la máxima de 99 992 y la media fue 32 029 huevos. La talla en la que el 50 % de los individuos presentan gónadas maduras (L50 fue de 43.7 cm de longitud total en hembras y de 42.7 cm en machos. Los ovarios presentaron dos tipos de ovocitos, los pequeños inmaduros en fase cromatina nucleolo (85.1 µm y los grandes maduros en fase de vitelogénesis secundaria (701.6 µm. En el testículo maduro se observó una gran cantidad de espermatozoides en el tubo seminal y el desarrollo del testículo es de tipo lobular. Con base en las características de las gónadas y la evolución temporal del índice gonadosomático, se concluye que G. equatorialis se reproduce dos veces al año (a mediados y finales del año.Reproduction of the fish Gymnothorax equatorialis (Pisces: Muraenidae in Jalisco and Colima, Mexico. A total of 707 Gymnothorax equatorialis were collected monthly in the Jalisco and Colima coast, Mexico, from December 1995 to December 1998 and from August to November 1999, in order to determine their reproduction patterns. Females outnumbered and had longer bodies (mean length 54.7 cm than males (52.1 cm. The minimum, maximum and mean values of total fecundity were respectively 9 660, 99 992 and 32 029 eggs. The total body length at which 50 percent of individuals have ripe gonads (L50 was 43.7 cm for females and 42.7 cm TL for males. Ovaries had two main types of oocytes: small inmature in cromatin nucleolus phase (85.1 µm and large mature in secundary vitellogenesis phase (701.6 µm. High numbers of spermatozoa were observed in the seminal tubes of ripe

  2. Hábitos alimentarios de los peces Lutjanus peru y Lutjanus guttatus (Pisces:Lutjanidaeen Guerrero,México

    Directory of Open Access Journals (Sweden)

    Agustín A Rojas-Herrera

    2004-12-01

    Full Text Available Se analiza la composición de la dieta del huachinango (Lutjanus peru y del flamenco (Lutjanus guttatus en la costa de Guerrero,México.Los ejemplares se obtuvieron mensualmente de las capturas comerciales en tres regiones de pesca y presentaron intervalos de talla comprendidos entre 130 y 684 mm de longitud horquilla (LHpara el caso de L.peru ,y de 120 a 550 mm para L. guttatus .A partir del número y del peso de los distintos componentes alimentarios,identificados hasta el taxon más bajo posible,se calcularon los porcentajes numéricos (%N,gravimétricos (%Py de frecuencia de ocurrencia (%FOque fueron sintetizados como valores de importancia relativa.En los estómagos de L.peru se identificaron 68 ítems alimentarios dentro de los cuales predominan los peces (%P =50.9,los crustáceos (%P =35.6y los moluscos (%P =7.2mientras que el espectro alimentario de L.guttatus estuvo integrado por 88 componentes que incluyeron principalmente peces (%P =50.8y crustáceos (%P =43.4.Ambas especies son depredadoras generalistas,con un amplio espectro de presas.Los valores de los índices de traslape de las dietas de estas especies sugieren que no existe un alto grado de competencia intraespecífica por el alimento.Con el fin de encontrar similitudes en la dieta de estos lutjánidos en varias localidades de México y Costa Rica,se realizó un análisis de conglomerados con los valores de importancia relativa de las presas,publicados en varios trabajos.Se encontró más afinidad en la dieta de aquellas especies que habitan en una misma localidad, que entre organismos de la misma especie distribuidos en diferentes zonas.Se infiere que la disponibilidad de las presas,más que la selectividad por el alimento,determina la dieta de estas especies.Feeding habits of the fishes Lutjanus peru and Lutjanus guttatus (Pisces:Lutjanidaeof Guerrero, México.Diet composition of the Pacific snapper (Lutjanus peru 130-684 mm fork length (FLand the spotted snapper (Lutjanus

  3. Dieta de la carpa Notropis moralesi (Pisces: Cyprinidae en el río Amacuzac, Morelos, México

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    Patricia Trujillo-Jiménez

    2009-06-01

    Full Text Available Notropis moralesi, conocido comúnmente como "carpa tepelneme", es un pez endémico del río Papaloapan. Se analizó su dieta y hábitos alimentarios. Se tomaron muestras mensuales en el río Amacuzac, Morelos, México. La identificación del contenido estomacal (294 ejemplares se llevó hasta el taxon más específico posible. Para la cuantificación se utilizaron los métodos numérico (No y frecuencia de aparición (F.O.. Se utilizó el índice de amplitud de nicho trófico de Levin y el índice de traslape de MacArthur y Levin. N. moralesi presentó la ingestión de once componentes alimenticios, de los cuales diez son de origen animal y uno vegetal. Los quironómidos y efemerópteros fueron los más consumidos independientemente del sexo, talla y época del año. El análisis por épocas del año, reportó diez componentes en el estiaje y ocho en las lluvias. La dieta de los inmaduros estuvo constituida por diez componentes, la de las hembras por ocho y el de los machos por cinco. La prueba de Ji-cuadrada reveló que no existen diferencias significativas entre las dietas por estadio de desarrollo, sexos y épocas del año. El traslape de los nichos tróficos, reveló valores superiores a 0.60 en todas las combinaciones por sexos y épocas del año. N. moralesi es una especie carnívora con tendencias insectívoras y presenta hábitos alimentarios de tipo bentófago.Diet of the chub, Notropis moralesi (Pisces: Cyprinidae in the Amacuzac River, Morelos, Mexico. Notropis moralesi, locally known as "carpa tepelneme", is a small endemic fish of the Papaloapan River. We analyzed its diet and feeding habits. Specimens were captured monthly from Amacuzac, River, Morelos, Mexico. The gut content of 294 specimens was identified to the most specific taxonomic category possible. We quantified gut content by the numerical and frequency of occurrence methods and used the Levin’s amplitude of trophic niche indices and MacArthur and Levin`s indices for

  4. Reproducción y crecimiento del pargo mancha Lutjanus guttatus (Pisces: Lutjanidae en el Golfo de Nicoya, Costa Rica

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    Rosa L Soto Rojas

    2009-06-01

    Full Text Available Una de las pesquerías más importantes en el Golfo de Nicoya es la del pargo mancha (Lutjanus guttatus; su captura se realiza con diversas artes y principalmente por la flota artesanal. Estudiamos especímenes de la captura comercial artesanal entre el 2002 y 2006. Se analizaron las relaciones morfométricas para aplicar la ecuación P = aLb; el análisis del estado de madurez gonadal se hizo macroscópicamente; se determinó la edad a través de la lectura de anillos anuales de los otolitos sagitales y los parámetros de crecimiento fueron aplicados en la ecuación de von Bertalanffy: L (t = * [1-exp (-K*(t-t0]. La relación longitud total-peso total es y = 0.0236x 2.8153 y longitud total-peso eviscerado y = 0.0216x2.8129; las relaciones simplificadas correspondientes fueron y = 0.0173x3 y y = 0.0162x3. La reproducción es todo el año con dos picos en marzo y setiembre (época seca y lluviosa, respectivamente. La proporción macho-hembra es 1:1. Se generó para la población del Golfo de Nicoya una clave edad-talla donde su utilidad se presenta como adecuada hasta los 6 años de edad. La curva de crecimiento von Bertalanffy es L (t=65,9(1-e -0,13(t+2,66.Reproduction and growth of the fish Lutjanus guttatus (Pisces: Lutjanidae in the Gulf of Nicoya, Costa Rica. The fish Lutjanus guttatus is important in the fisheries of Golfo de Nicoya, Costa Rica where they are captured with varied gear mainly by the artisanal fleet. We measured specimens from the commercial catch of 2002-2006. Gonadal state was determined macroscopically and age with otoliths The total length-total weight relationship was y = 0.0236x2.8153 and total length-eviscerated weight y = 0.0216x2.8129. Simplified relationships were y = 0.0173x3 and y = 0.0162x3. There is year-round reproduction with peaks in March (dry season and September (rainy season. Male-female sexual ratio was 1:1. The age-length key for the gulf shows availability until the 6 years of age. The von Bertalanffy

  5. Mode d'exploitation et durabilité de la pêche de Oreochromis niloticus (Linnaeus, 1758, Clarias gariepinus (Burchell, 1822 et Gymnarchus niloticus (Cuvier, 1829 dans le lac de barrage du Sourou (Burkina Faso

    Directory of Open Access Journals (Sweden)

    Dialla, Z.

    2016-01-01

    Full Text Available Mode of Operation and Sustainability of Oreochromis niloticus (Linnaeus, 1758, Clarias gariepinus (Burchell, 1822 and Gymnarchus niloticus (Cuvier, 1829 Fisheries in the Sourou Dam Lake (Burkina Faso. This research on fishery exploitation in the Sourou dam raises the issue of sustainable management of common property. The central hypothesis is that the effectiveness of co-management for sustainable fishing practices is related to the level of ownership of that management and actors' games by fishing communities. In analysing co-management induced effects on fishing practices and exploitation of C. gariepinus, O. niloticus and G. niloticus species, related to its implementation in Sourou fishery, a research methodology that combines qualitative and quantitative methods is used. Socio-economic surveys were conducted with 30 fishermen in three villages bordering the fishery. Biological surveys were also conducted with catches of C. gariepinus, O. niloticus and G. niloticus of these fishermen,. The results indicate a weak ownership of the co-management model by fishermen and the strategies of actors that consist to minimize the costs of the sustainable management of fisheries resources at individual level. Indeed, even when informed of fisheries regulations, fishermen use prohibited fishing equipment (54.1% of the catches of studied species, and fishi illegally (43.3% of the fishermen. Furthermore, significant proportions of each studied species are captured before their first maturity sizes (52.2% of C. gariepinus, 15.8% of G. niloticus and 14.3% of O. niloticus. So, the central hypothesis is verified because the weak ownership of co-management by fishing communities and the actors' strategies do not encourage them to develop a responsible behavior for sustainable fishing.

  6. Flavobacterium psychrophilum y su patología en alevines de Onchorhynchus mykiss del centro piscícola El Ingenio, Huancayo

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    Jorge León

    2008-12-01

    Full Text Available En el presente trabajo se reporta la presencia de Flavobacterium psychrophilum, como agente causante de la patología “enfermedad bacteriana del agua fría” en alevines de Onchorhynchus mykiss “trucha arco iris” del Centro Piscícola El Ingenio, Junín (3250 m de altitud. La lesión macroscópica externa más frecuente fue la ulceración profunda de la región dorsal del pez acompañado de un ennegrecimiento localizado de la piel. Internamente se observó una marcada esplenomegalia, palidez del hígado, riñón y branquias, inflamación del intestino y acumulación de líquido ascítico en el peritoneo. No se detectó hemorragia interna. En Agar Cytophaga Modificado (ACM según Anaker & Ordal (1959 fueron aisladas inicialmente 29 Gram negativas, de las cuales según la caracterización fenotípica y pruebas bioquímicas 9 fueron consideradas como F. psychrophilum. Pruebas de susceptibilidad antibiótica mostraron alta sensibilidad de las cepas a Gentamicina, Ceftazidina, oxitetraciclina, Norfloxacina, furazolidona, Ciprofloxacina y Cefoxitina.

  7. Thermal conductivity reduction of tungsten plasma facing material due to helium plasma irradiation in PISCES using the improved 3-omega method

    Energy Technology Data Exchange (ETDEWEB)

    Cui, Shuang [Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093 (United States); Simmonds, Michael [Department of Physics, University of California, San Diego, La Jolla, CA 92093 (United States); Center for Energy Research, University of California, San Diego, La Jolla, CA 92093 (United States); Qin, Wenjing; Ren, Feng [School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072 (China); Tynan, George R. [Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093 (United States); Center for Energy Research, University of California, San Diego, La Jolla, CA 92093 (United States); Doerner, Russell P. [Center for Energy Research, University of California, San Diego, La Jolla, CA 92093 (United States); Chen, Renkun, E-mail: rkchen@ucsd.edu [Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093 (United States); Center for Energy Research, University of California, San Diego, La Jolla, CA 92093 (United States)

    2017-04-01

    The near-surface region of plasma facing material (PFM) plays an important role in thermal management of fusion reactors. In this work, we measured thermal conductivity of tungsten (W) surface layers damaged by He plasma in PISCES at UCSD. We studied the damage effect on both bulk, and thin film, W. We observed that the surface morphology of both bulk and thin film was altered after exposure to He plasma with the fluence of 1 × 10{sup 26} m{sup −2} (bulk) and 2 × 10{sup 24} m{sup −2} (thin film). Transmission electron microscopy (TEM) analysis reveals that the depth of the irradiation damaged layer was approximately 20 nm on the bulk W exposed to He plasma at 773 K for 2000 s. In order to measure the thermal conductivity of this exceedingly thin damaged layer in the bulk W, we adopted the well-established ‘3-omega’ method and employed novel nanofabrication techniques to improve the measurement sensitivity. For the damaged W thin film sample, we measured the reduction in electrical conductivity and used the Wiedemann-Franz (W-F) law to extract the thermal conductivity. Results from both measurements show that thermal conductivity in the damaged layers was reduced by at least ∼80% compared to that of undamaged W. This large reduction in thermal conductivity can be attributed to the scattering of electrons, the dominant heat carriers in W, caused by defects introduced by He plasma irradiation.

  8. Possible Threat for Middle East Inland Water: an Exotic and Invasive Species, Pterygoplichthys disjunctivus (Weber, 1991 in Asi River, Turkey (Pisces: Loricariidae.

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    Şükran Yalçın Özdilek

    2015-12-01

    Full Text Available Ortadoğu iç suları için muhtemel tehdit: Asi Nehri’nde egzotik ve işgalci bir tür Pterygoplichthys disjunctivus (Weber, 1991 (Pisces: Loricariidae. Pterygoplichthys disjunctivus bireyleri Güney Amerika kökenli olup, bu egzotik ve işgalci türü bireyleri Kuzey Amerika ve Uzakdoğu ülkelerine dağılmışlardır. Orta Doğu’da yer alan Asi Nehri’nin Türkiye sınırları dahilinde daha önce kayıtlarda bulunmayan bir P. disjunctivus bireyi yakalanmıştır. P. disjunctivus Asi Nehri’nde potansiyel olarak işgalci bir tür olabilir. Eğer bu türün bireyleri Asi Nehri’ne yayılırsa, buradaki türlerden Garra rufa üyeleri muhtemelen ilk etkilenen doğal türlerden olacaktır. Çünkü P. disjunctivus ile aynı trofik düzeyde yer almaktadırlar

  9. Chorisochismus dentex (Pisces: Gobiesocidae)

    African Journals Online (AJOL)

    fish fauna, utilize more than the occasional small limpet, adult C. dentex may be the major fish predator on an other- wise seldom utilized food resource of the South African intertidal zone. Gould (1965) reported the presence of excretory capsules in the emerald clingfish, Acyrtops beryllinus (Hildebrand &. Ginsberg).

  10. Pisces : Perciformes, Ambassidae

    African Journals Online (AJOL)

    1985-05-28

    May 28, 1985 ... Munro 1967; Allen 1982). During the course of a study of the biology of the .... predorsal scales 13-16; preorbital bone with exposed, posteriorly directed ... Figure 1 Head of Ambassidae showing ridges and edges of bones where spines of taxonomic importance occur (after Fraser-. Brunner, 1956). Table 2 ...

  11. Assessment of the sea-ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (NEMO-LIM-PISCES

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    Sébastien Moreau

    2016-08-01

    Full Text Available Abstract The role of sea ice in the carbon cycle is minimally represented in current Earth System Models (ESMs. Among potentially important flaws, mentioned by several authors and generally overlooked during ESM design, is the link between sea-ice growth and melt and oceanic dissolved inorganic carbon (DIC and total alkalinity (TA. Here we investigate whether this link is indeed an important feature of the marine carbon cycle misrepresented in ESMs. We use an ocean general circulation model (NEMO-LIM-PISCES with sea-ice and marine carbon cycle components, forced by atmospheric reanalyses, adding a first-order representation of DIC and TA storage and release in/from sea ice. Our results suggest that DIC rejection during sea-ice growth releases several hundred Tg C yr−1 to the surface ocean, of which < 2% is exported to depth, leading to a notable but weak redistribution of DIC towards deep polar basins. Active carbon processes (mainly CaCO3 precipitation but also ice-atmosphere CO2 fluxes and net community production increasing the TA/DIC ratio in sea-ice modified ocean-atmosphere CO2 fluxes by a few Tg C yr−1 in the sea-ice zone, with specific hemispheric effects: DIC content of the Arctic basin decreased but DIC content of the Southern Ocean increased. For the global ocean, DIC content increased by 4 Tg C yr−1 or 2 Pg C after 500 years of model run. The simulated numbers are generally small compared to the present-day global ocean annual CO2 sink (2.6 ± 0.5 Pg C yr−1. However, sea-ice carbon processes seem important at regional scales as they act significantly on DIC redistribution within and outside polar basins. The efficiency of carbon export to depth depends on the representation of surface-subsurface exchanges and their relationship with sea ice, and could differ substantially if a higher resolution or different ocean model were used.

  12. Estructura de tallas y edad del marlin rayado Tetrapturus audax (Pisces:Xiphidae,en Cabo San Lucas,Baja California Sur,México

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    Felipe Neri Melo Barrera

    2004-12-01

    Full Text Available De 1988 a 1993 se muestrearon 1030 ejemplares de marlin rayado (Tetrapturus audax capturados por la flota deportiva de Cabo San Lucas.Se recolectaron 389 espinas dorsales para la estimación de la edad.La relación Longitud mandibular-Radio total de la espina es similar para hembras y machos.Se encontró que la cuarta espina dorsal refleja adecuadamente el crecimiento.La periodicidad de formación de las marcas de crecimiento es anual y parece que se relaciona con la temperatura superficial promedio del mar.Se contaron las bandas opaco-hialinas en cada corte de las espinas,y se encontraron diez grupos de edad (del dos al once,siendo el grupo siete el más abundante, seguido por los grupos seis y ocho.Las tallas observadas para el marlin rayado fueron de 160-280 cm de longitud mandibular,el 90%de los organismos estuvieron entre 190 y 225 cm.Los ejemplares pequeños se incorporan a la pesquería de junio hasta diciembre.Size and age structure of the striped marlin Tetrapturus audax (Pisces:Xiphidae,at Cabo San Lucas,Baja California Sur,México .The striped marlin (Tetrapturus audaxis found in temperate and tropical waters of the Pacific and Indian Ocean.It is particularly abundant in the southern tip of the Baja California peninsula.Specimens brought to Cabo San Lucas port (22 °53 ’ N y 109 °54 ’ Wby the sport fishery fleet that operates withing a radius of 54 km from 1988 to 1993 were sexes,measured and weighed.A total 1030 individuals were sampled.Dorsal fin spines (389were collected for age estimation.The spines were sectioned and hyaline-opaque bands counted.The relation of length to spine radius was similar for males and females.The fourth dorsal spine reflected the growth of the fish.The rhythm of growth mark formation is yearly and related to the sea surface temperature.Ten age groups were found and the seventh group was the most abundant,followed by groups "6 "and "8 ".The age structure of the striped marlin was stable in the study

  13. Estabilidad temporal de las infracomunidades de parásitos en la borrachilla Scartichthys viridis (Valenciennes, 1836 (Pisces : Blenniidae en la costa central de Chile Temporal stability in parasite infracommunities of the blenny Scartichthys viridis(Valenciennes, 1836 (Pisces: Blenniidae on the central coast of Chile

    Directory of Open Access Journals (Sweden)

    FREDDY DÍAZ

    2002-12-01

    Full Text Available Se comparan las infracomunidades de parásitos de la borrachilla Scartichthys viridis (Pisces: Blenniidae de tres muestras tomadas en un lapso de 17 meses, entre 1999 y 2001, desde pozas intermareales vecinas a Las Cruces (33°27' S, 71°37' O, Chile central. El objetivo es averiguar si la riqueza, diversidad, abundancia y composición de las infracomunidades de parásitos son persistentes o no en el tiempo ontogenético y cronológico. Se recolectaron 10 taxa parasitarios en cerca del 89 % de los 63 huéspedes examinados, de los cuales ocho eran metazoarios. La búsqueda de protozoos se realizó sólo en los últimos 2 años. El 75 % de los ocho taxa de metazoos ocurrieron en los tres años, uno no estuvo presente en un año, y otro fue encontrado solamente en un año. La mayoría de los huéspedes examinados albergaba protozoos parásitos. La prevalencia de los protozoos Cryptobia sp. fue alta para ambos años, y menor en Trichodina sp. La longitud total de los huéspedes era un predictor relevante de las variaciones en la riqueza, abundancia, diversidad y composición infracomunitaria en el conjunto de los tres años. En cambio, el año de muestreo no lo fue, en particular al comparar entre huéspedes de similar longitud total. Estos resultados son similares a los encontrados en infracomunidades de parásitos de otras especies de peces en Chile, en que hay baja variabilidad en las propiedades agregadas de las infracomunidades en el tiempo cronológico. Se discute acerca de la extensión relativa del tiempo ontogenético en contraste al tiempo cronológico al ser probablemente ambos de importancia en las características de las infracomunidades, y se propone que se explore la medida en la cual estos resultados constituyen un patrón.Parasite infracommunities of the blenny Scartichthys viridis (Pisces: Blenniidae are compared among three samples taken within a 17-month period during three consecutive years (1999-2001, from intertidal pools at

  14. Feeding of Pellona flavipinnis (Clupeiformes, Pristigasteridaein a Central Amazonian floodplain Dieta de Pellona flavipinnis (Clupeiformes, Pristigasteridae em planície alagada da Amazônia Central

    Directory of Open Access Journals (Sweden)

    Sandra S. Moreira-Hara

    2009-06-01

    Full Text Available The feeding habits of Pellona flavipinnis (Valenciennes, 1836 at Catalão, a floodplain area on the Brazilian Central Amazon was studied. Data was obtained during three hydrological cycles, between September 1999 and September 2003. Diet composition, daily and seasonal variation in the feeding activity and the relationship between predator's size and its prey were analyzed. Almost 80% of the food consumed has autochthonous origin and diet was composed basically by insects and fish. Juvenile fish predominated in the stomach contents of all size classes but there was no significant relationship between predator's size and its prey. Pellona flavipinnis may be considered a carnivorous species which feeds mainly on juvenile (young-of-the-year specimens of other fish. More intense feeding activity occurred at night and in the high water period.Os hábitos alimentares de Pellona flavipinnis (Valenciennes, 1836 de uma área de várzea na Amazônia Central, Catalão, foram estudados. Foram utilizados dados referentes a três ciclos hidrológicos, entre setembro de 1999 e setembro de 2003. Foram analisados a dieta, a atividade alimentar diária e sazonal e a relação entre o comprimento da presa e o do predador. Cerca de 80% dos alimentos consumidos eram de origem autóctone e a dieta composta basicamente de insetos e peixes. Peixes juvenis predominaram nos conteúdos estomacais de exemplares de todas as classes de tamanho, mas não houve relação significativa entre o tamanho do predador e o das presas consumidas. Pellona flavipinnis pode ser considerada uma espécie carnívora que se alimenta principalmente de indivíduos juvenis de outras espécies de peixes. A atividade alimentar foi maior durante a noite e no período da cheia.

  15. Aprovechamiento de las vísceras de pescado como fuente de energía para minimizar el problema de contaminación ambiental del sector piscícola.

    Directory of Open Access Journals (Sweden)

    Lina María Pinzón Naranjo

    2016-12-01

    Full Text Available Este artículo plantea el potencial que tienen algunos desechos de la industria piscícola -como es el caso de las vísceras de pescado- que pueden ser utilizados como fuentes de energía, para producción de biodiesel, el cual genera un serio problema ambiental en los departamentos del Huila y Tolima. Se evidencia afectación física y química de la estructura del suelo al ser enterrados los desechos en sectores aledaños a la zona de lagos, y cuando se desecha en el agua, reduce la vida acuática al agotar el oxígeno disuelto; por lo tanto es necesaria la búsqueda de alternativas para disminuir el impacto causado por este tipo de residuos, buscando el aprovechamiento de desechos orgánicos como fuentes de energía y de esta manera minimizar el problema de contaminación ambiental, y generar un valor agregado a este desecho piscícola. Se estudia la viabilidad de la obtención de   aceite crudo de pescado y la conversión  a biodiesel conociendo las características de cada uno para garantizar la eficiente producción del biocombustible. Se presenta la caracterización de la materia prima, desde su recolección hasta la obtención del aceite y la realización de pruebas físico-químicas para la determinación de parámetros de calidad. Posteriormente se aborda la obtención y caracterización del biodiesel, que pretende conocer sus propiedades y compararlas con los rangos establecidos por las normas que rigen este biocombustible. Finalmente, se presenta un análisis estadístico para demostrar la mejor relación molar aceite/alcohol empleada en la fase de transesterificación. 

  16. Caractéristiques de la population de Distichodus rostratus Günther, 1864 (pisces: Distichodontidae du lac de barrage de Taabo (bassin du Bandama, Côte d'Ivoire. Implications pour une gestion rationnelle du stock

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    Aliko, NGG.

    2010-01-01

    Full Text Available Population Characteristics of Distichodus rostratus Günther, 1864 (pisces: Distichodontidae in the Taabo Man Made Lake (Bandama Basin, Ivory Coast. Implications for a Rational Management of the Stock. Some characteristics of the fish Distichodus rostratus of Taabo lake were studied in order to establish basis of a rational management of the stock. Specimens were sampled in July, October and December 2006 and March and June 2007. Analyses were about the spatio-temporal dynamic of population sex-ratio, size structure, length-weight relationships and condition factor. The global sex-ratio was in favour of the males (3.5 :1 and presented a seasonal variation. Fish size ranged from 47 to 530 mm SL and there was a significant difference (p< 0.05 between individuals sampled in the superior part (Mean= 183.09 ± 75.10 mm SL of the lake and those sampled in the inferior part (Mean= 110.91 ± 38.30 mm SL. Specimens caught during inflow had length widely higher than those caught during drop in the water level (p< 0.05. The growth of this species appeared positive allometric in almost all the categories (b= 2.98 - 3.33. The condition factor ranged from 0.44 to 5.97 and it was higher for fish collected in the superior part (Mean= 1.92 ± 0.27 than those collected in the inferior one (Mean= 1,64 ± 0.41.

  17. Ecología trófica y aspectos reproductivos de Trichomycterus areolatus (Pisces,Trichomycteridaeen ambientes lóticos artificiales

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    Evelyn Habit

    2005-06-01

    reproductivaTrophic ecology and reproductive aspects of Trichomycterus areolatus (Pisces, Trichomycteridae in irrigation canal environments. Twelve of the sixteen species of fishes present in the Itata river basin enter the irrigation canals at least once a year, constituting a habitat that is frequently utilized by the native fish assemblages. However, only Trichomycterus areolatus, a native siluriform, is found in great number throughout the entire year, being the dominant species of such artificial environments. Among the factors that could explain the relative success of T. areolatus are its benthonic habits, adaptation to rithral habitat, an offer of trophic resources that is in line with its feeding habits, and a lower abundance of predators in the canals. In this study, the trophic ecology of this species in 174 individuals inhabiting the Itata river (Octava Región, Chile and 231 from irrigation canals that arise from this river are analyzed and compared. In addition, the length-weight relationship and seasonal frequencies of reproductive status are analyzed, with the purpose of inferring on the status of these populations and their possible condition of resident in these canals. In canals, its diet includes a greater number of different taxa as well as total number of preys consumed in comparison with the river populations, including items of greater biomass, such as lumbriculides. The selectivity analysis showed that T. areolatus prefer prey items like Chironomidae, Baetidae, Elmidae, Plecoptera and Hyallela. Although both the river as well as canal populations show an isometric type growth, they reach greater body lengths and weights in the latter. According to the reproductive states analysis in different periods of the year, populations inhabiting canal environments reproduce synchronically with those of the river, although these latter tend to show a slight delay in the reproductive activity. Rev. Biol. Trop. 53(1-2:195-210. Epub 2005 Jun 24

  18. Desarrollo larvario de algunas especies del género Bregmaceros (Pisces: Bregmacerotidae del sureste del Golfo de México

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    Jorge Blas-Cabrera

    2006-06-01

    Full Text Available Se redescribe el desarrollo larvario de Bregmaceros cantori con 925 organismos en tallas de 1.1 a 20.2 mm de longitud patrón (LP y se describen algunos ejemplares de B. atlanticus (27 larvas de 1.7 a 7.5 mm, de B. houdei (seis organismos de 1.5 a 1.9 mm y de B. macclellandi (tres larvas de 2.4, 3.4 y 5.4 mm del sur del Golfo de México (27 noviembre - 6 diciembre 1998. Las larvas se identificaron a nivel específico y se describieron con base en pigmentación, y características morfométricas y merísticas. En la etapa de preflexión B. cantori presentó un mayor crecimiento del tamaño de la boca y de la longitud de la cabeza en relación con la longitud patrón (alometría positiva; en cambio de la etapa de flexión a la etapa de juvenil decrecen (alometría negativa. B. cantori es la especie con la menor altura del cuerpo y longitud de la cabeza, siendo así la más delgada. Las larvas de B. macclellandi son las más robustas. De las cuatro especies que se reportan en el sur del Golfo de México, las larvas de B. atlanticus son las que tienen la mayor pigmentación tanto en la cabeza como en el cuerpo, de manera uniforme; los ejemplares de B. macclellandi muestran un patrón de pigmentación diferente: grandes grupos de melanóforos cuya ubicación cambia con la etapa; además ya en la etapa de preflexión tiene desarrollo del radio occipital y las aletas pélvicas. Las larvas de B. houdei con tallas de 1.5 a 1.9 mm tienen melanóforos en la punta de la mandíbula inferior, en la cabez y en la base de las aletas pectorales. Se observó un mayor desarrollo larvario de B. cantori y B. atlanticus que en especímenes de latitudes mayores.Larval development of some Bregmaceros species (Pisces: Bregmacerotidae from the southeast Gulf of Mexico. We redescribe the larval development of Bregmaceros cantori based on 925 specimens ranging from 1.1 to 20.2 mm in standard length (SL, and describe the larvae of B. atlanticus (27 larvae, 1.7-7.5 mm, B

  19. 14. Pisces, Reptilia and Aves

    NARCIS (Netherlands)

    Beaufort, de L.F.

    1931-01-01

    In the following list of fishes and reptiles, known to occur as fossils in the Indoaustralian Archipelago, I have chiefly followed Smith Woodward (Bibl. 18) for the taxonomy. The teleosts, however, have been arranged according to Boulenger (The Cambridge Natural History, Vol. VII, 1904), with some

  20. Crecimiento somático y relación ARN/ADN en estadios juveniles de Eucinostomus argenteus (Pisces: Gerreidae en dos localidades del Caribe de Venezuela Somatic growth and RNA/DNA rate of Eucinostomus argenteus (Pisces: Gerreidae juveniles stages at two localities of the Venezuelan

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    Ana Teresa Herrera-Reveles

    2012-03-01

    Full Text Available Con la finalidad de evaluar la asociación de índices de crecimiento en estadios tempranos de peces marinos, se estimó la tasa de crecimiento somático y las condiciones fisiológicas de Eucinostomus argenteus en dos zonas del nor-oriente venezolano: Bahía de Mochima y Golfo de Cariaco. La edad y el crecimiento fueron estimados basados en análisis de otolitos sagitta. Las condiciones fisiológicas fueron evaluadas por medio de las concentraciones de proteínas y la relación ARN/ADN, empleando técnicas espectofotométricas y fluorométricas sobre tejido muscular. Las relaciones entre tallas con la edad y el diámetro de los otolitos resultaron positivas, significativas y ajustadas a un modelo de regresión lineal. Los valores de la tasa de crecimiento reciente oscilaron entre 0.178 y 0.418mm día-1, la tasa de crecimiento retrocalculado varió entre 0.295 y 0.393mm día-1, y la tasa ARN/ADN osciló entre 1.65 y 6.97. No se registraron diferencias entre las zonas de estudio, sin embargo se reportaron diferencias entre localidades. A pesar de no encontrarse correlación entre la tasa de crecimiento y la relación ARN/ADN, los valores reportados sugieren crecimiento positivo de los individuos silvestres en las localidades evaluadas. No obstante, ciertas localidades mostraron valores que indican pobres condiciones nutricionales, pudiendo afectarse a futuro otras tasas vitales.Somatic growth and RNA/DNA rate of Eucinostomus argenteus (Pisces: Gerreidae juveniles stages at two localities of the Venezuelan Caribbean. In order to evaluate the association among growth indices of marine fishes at early life stages, the somatic growth rate and physiological conditions of Eucinostomus argenteus were estimated at two Venezuelan North-East zones: Mochima Bay and Cariaco Gulf. The age and somatic growth rate were estimated based on daily growth increments in sagitta otoliths. The physiological conditions were evaluated with proteins concentrations and RNA

  1. 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.

  2. Population structure of the Korean gizzard shad, Konosirus punctatus (Clupeiformes, Clupeidae) using multivariate morphometric analysis

    Science.gov (United States)

    Myoung, Se Hun; Kim, Jin-Koo

    2016-03-01

    The gizzard shad, Konosirus punctatus, is one of the most important fish species in Korea, China, Japan and Taiwan, and therefore the implementation of an appropriate population structure analysis is both necessary and fitting. In order to clarify the current distribution range for the two lineages of the Korean gizzard shad (Myoung and Kim 2014), we conducted a multivariate morphometric analysis by locality and lineage. We analyzed 17 morphometric and 5 meristic characters of 173 individuals, which were sampled from eight localities in the East Sea, the Yellow Sea and the Korean Strait. Unlike population genetics studies, the canonical discriminant analysis (CDA) results showed that the two morphotypes were clearly segregated by the center value "0" of CAN1, of which morphotype A occurred from the Yellow Sea to the western Korean Strait with negative values, and morphotype B occurred from the East Sea to the eastern Korean Strait with positive values even though there exists an admixture zone in the eastern Korean Strait. Further studies using more sensitive markers such as microsatellite DNA are required in order to define the true relationship between the two lineages.

  3. Mitogenomic evidence for an Indo-West Pacific origin of the Clupeoidei (Teleostei: Clupeiformes.

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    Sébastien Lavoué

    Full Text Available The clupeoid fishes are distributed worldwide, with marine, freshwater and euryhaline species living in either tropical or temperate environments. Regional endemism is important at the species and genus levels, and the highest species diversity is found in the tropical marine Indo-West Pacific region. The clupeoid distribution follows two general pattern of species richness, the longitudinal and latitudinal gradients. To test historical hypotheses explaining the formation of these two gradients, we have examined the early biogeography of the Clupeoidei in reconstructing the evolution of their habitat preferences along with their ancestral range distributions on a time-calibrated mitogenomic phylogeny. The phylogenetic results support the distinction of nine main lineages within the Clupeoidei, five of them new. We infer several independent transitions from a marine to freshwater environment and from a tropical to temperate environment that occurred after the initial diversification period of the Clupeoidei. These results combined with our ancestral range reconstruction hypothesis suggest that the probable region of origin and diversification of the Clupeoidei during the Cretaceous period was the tropical marine precursor to the present Indo-West Pacific region. Thus, our study favors the hypotheses of "Region of origin" and "Tropical conservatism" to explain the origins of the longitudinal and latitudinal gradients of clupeoid species richness, respectively. Additional geological and paleontological evidence further define the tropical marine paleo-region of origin as the eastern Tethys Sea region. The Cretaceous fossil record of the Clupeoidei is partially incongruent with the results here as it contains taxa found outside this region. We discuss three possible causes of conflict between our biogeographical hypothesis and the distributions of the Cretaceous clupeoid fossils: regional extinction, incomplete taxonomic sampling and incorrect timescale estimation.

  4. Using new tools to identify eggs of Engraulis anchoita (Clupeiformes, Engraulidae).

    Science.gov (United States)

    Favero, J M; Katsuragawa, M; Zani-Teixeira, M L; Turner, J T

    2014-12-26

    Efficiency of the identification of eggs of Engraulis anchoita can be greatly improved by a method developed from egg measurements, using photography and the ImageJ programme, analysed by discriminant analysis using R software. © 2014 The Fisheries Society of the British Isles.

  5. Biology of Chirocentrodon bleekerianus (Poey, 1867 (Clupeiformes: Pristigasteridae in a continental shelf region of southern Brazil

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    Carlos Eduardo Corrêa

    2005-05-01

    Full Text Available This study provides information on the biology of C. bleekerianus from Paraná State coast, Brazil, assembling data about its abundance, size structure, diet and reproduction. Monthly collections were accomplished in 1999 and 2000 in the internal continental shelf, with trawl net. The catch-per-unit-effort did not vary significantly among the seasons. In the summer, the individuals were larger, followed by autumn, spring and winter. C. bleekerianus was predominantly planktivorous and the most frequent items in its diet were copepods followed by diatomaceous algae. Seasonal variation in the frequency values of the gonad maturation stages, gonadossomatic index and gonadal condition factor indicated that the reproductive period encompassed spring and summer. The mean total length at first maturity of females was estimated to be 76 mm.Este trabalho fornece dados sobre a biologia de C. bleekerianus do litoral do Estado do Paraná, reunindo dados sobre sua abundância, estrutura em tamanho, dieta e reprodução. Coletas mensais foram realizadas em 1999 e 2000 na plataforma continental interna, com rede de arrasto de fundo com portas. A captura por unidade de esforço não variou significativamente entre as estações do ano. No verão os indivíduos eram maiores, seguido do outono, primavera e inverno. C. bleekerianus é predominantemente planctívora, sendo copépodos seguidos de algas diatomáceas os itens alimentares mais freqüentes em sua dieta. As variações sazonais de valores da freqüência de estádios de maturação gonadal, do índice gonadossomático e do fator de condição gonadal indicam que o período reprodutivo compreende primavera e verão. O comprimento total médio de primeira maturação das fêmeas é estimado em 76 mm.

  6. Reproducción y alimentación del tiburón enano Mustelus dorsalis (Pisces: Triakidae en el Golfo de Nicoya, Costa Rica: Elementos para un manejo sostenible

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    José Rodrigo Rojas M

    2006-09-01

    Full Text Available Se determinaron aspectos reproductivos y alimentarios del tiburón enano Mustelus dorsalis, a partir de 311 ejemplares capturados con línea y anzuelo en el Golfo de Nicoya, Costa Rica, durante marzo de 1999 y mayo de 2000. Se reconocieron 250 hembras y 61 machos. Las hembras son más grandes (550 a 660 mm vs. (500-585 mm y más pesadas (400-1 000 g vs. (200-300 g que los machos. Todos los ejemplares estaban maduros, la talla mínima de especimenes maduros fue de 500 y 541 mm para hembras y machos respectivamente. Entre septiembre y marzo todas las hembras y machos estaban maduras, e inmaduras entre abril y agosto. Se estudiaron 1 259 embriones, con una variación entre dos y seis embriones por litera. La longitud total de los embriones es entre 130 y 205 mm y el peso entre 6 y 35 g. Este tiburón es carnívoro polífago oportunista que consume crustáceos (Squilla hancocki, S. parva, Farfantepenaeus sp., peces (Anchoa sp. Caranx, sp, Lujanus sp., Engraulis y Ophistonema sp., y moluscos (Loligo sp. y Octopus sp.. Squilla hancocki es el ítem alimentario mas importante. La presencia de tiburones maduros de ambos sexos a lo largo del año en aguas poco profundas, y el consumo de presas bentónicas que viven en fondos rocosos costeros, sugiere la posibilidad de que este sector del Golfo de Nicoya esté funcionando como una zona de crianza y hábitat esencial. Con base en estos resultados se propone el establecimiento de un plan de manejo integral.Reproduction and feeding habits of Mustelus dorsalis (Pisces: Triakidae in the Gulf of Nicoya, Costa Rica: Elements for a sustainable management. A total of 311 sharptooth smooth-hound Mustelus dorsalis were collected in the Gulf of Nicoya, Costa Rica from March 1999 to May 2000 to determine reproduction and feeding habits. The fishes were collected using hook and line. 250 females and 61 males were identified. The females are bigger (550-660 mm and heavier (400-1 000 g than males (500-585 mm and 200-300 g

  7. Efecto de la pluviosidad y el brillo solar sobre la producción y características del semen en el pez Brycon henni (Pisces:Characidae

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    C.J Tabares

    2006-03-01

    Full Text Available El pez Brycon henni es una especie endémica protegida por la legislación colombiana, que habita cuerpos de agua de zonas cafeteras (700-1900 m. s. n. m,comprendidas entre los 4º35’56’’ N y 74º04’51’’ W, con temperaturas que oscilan entre los 18 y los 28ºC. A pesar de las características promisorias de esta especie, su reproducción en cautiverio a nivel comercial no ha sido posible por falta de conocimientos básicos de su biología y comportamiento. El objetivo del presente trabajo fue caracterizar la producción y la fisiología espermática de machos en cautiverio. A lo largo de un año se tomaron 20 muestras de cada uno de 10 ejemplares. El semen se obtuvo mediante masaje abdominal cráneo-caudal y se transportó a 4ºC para su análisis en el laboratorio. Con excepción de septiembre y octubre que fueron los meses más lluviosos, siempre se obtuvo semen de al menos el 50% de los animales. El color, la osmolalidad y el pH fueron similares en todas las muestras a lo largo del año. El volumen, la concentración, la viabilidad, la movilidad y el tiempo de activación fueron variables: El efecto del brillo solar fue positivo sobre el volumen (Spearman pEffect of pluviosity and sun shine on sperm production and seminal characteristics of the fish Brycon henni (Pisces:Characidae. In Colombia the fish Brycon henni is a protected endemic species. It inhabits water bodies in coffee producing areas (700-1900 ma.s.l.; 4º35’56’’ N -74º04’51’’ W; 18-28°C. Insufficient knowledge of its basic biology and behavior prevent the commercial culture of this promising fish. We studied the production and sperm physiology of captive males. Along a year 20 samples were taken from each of 10 males. The sample was obtained by abdominal cefalo-caudal massage and transported to the laboratory at 4°C. Except for September and October (maximum rainfall,sperm was always obtained in at least 50% of the males. Color, osmolality and pH were

  8. Notes on the diet of Pterogymnus laniarius (Cuvier)

    African Journals Online (AJOL)

    dentatus, Octopus sp. and Chlamys tincta are associated with reefs, it is clear that the most important prey are found on soft substrates. These include Macoma sp., Goneplax angulata; Mursia cristimanus and Dictenophiura anoidea. In a study of the diet of P. laniarius taken by trawlers in the. Eastern Cape, Hecht (1976) also ...

  9. Population Parameters of Blainvilles and Cuviers Beaked Whales

    Science.gov (United States)

    2015-09-30

    cetacean populations. Long-term monitoring of beaked whale populations in El Hierro , a nearly pristine habitat far from areas of sonar testing or...marine industry, enables valuable studies of demographic trends and life history dictated mainly by natural parameters. El Hierro is in process of...functioning (expected in 2018-2019), it is essential to continue monitoring the populations in El Hierro to obtain an uninterrupted long-term dataset of

  10. Reproductive biology of common octopus Octopus vulgaris (Cuvier ...

    African Journals Online (AJOL)

    Western Indian Ocean Journal of Marine Science. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 13, No 1 (2014) >. Log in or Register to get access to full text downloads.

  11. Reproductive biology of common octopus Octopus vulgaris (Cuvier ...

    African Journals Online (AJOL)

    Abstract. Although common octopus catches are increasing globally, lack of information on the species reproductive biology has been a major concern in its management particularly in Kenya. The present study aimed at investigating the reproductive biology of Octopus vulgaris from Shimoni and Vanga in the Kenyan South ...

  12. Aspects Of The Biology Of Heterotis niloticus Cuvier 1829 ...

    African Journals Online (AJOL)

    Studies on some aspects of the biology of Heterots nilotcus in Anambra river were carried out for 22 months. Analysis of the stomach content of 546 species of H. niloticus in Anambra river established the preponderance o plantivorous crustacean, copepods and cladocera throughout the four maturation stages examined.

  13. Distribution and relative abundance of anchovies (Clupeiformes-engraulididae in the Sepetiba Bay, Rio de Janeiro, Brazil

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    Márcio de Araújo Silva

    2000-01-01

    Full Text Available Distribution and relative abundance of juvenile fish of the family Engraulididae in the Sepetiba Bay, Rio de Janeiro, Brazil was assessed to detect patterns of use of the shallows during their early life cycle. Two yearly cycle (March-1996 to February-1997 and March-1997 to February-1998 were studied by a total of 120 beach net samples at five sites, two of them located in the inner Bay and three in the outer Bay near to the sea limit. Six Engraulididae species were identified in two genera: Anchoa januaria, Anchoa marinii, Anchoa tricolor, Anchoa lyolepis, Anchoviella lepidentostole and Anchoviella brevirostris, mainly juveniles in their early life cycle. A. januaria, A. brevirostris, A. lepidentostole and A. tricolor, in decreasing order, were the top numerical abundant species, while A. tricolor and A. januaria showed the highest weight contribution, amounting approximately to 90% of the total number of fish. Spatially, A. tricolor, A. lyolepis and A. marinii distributed mainly in the outer Bay. A. januaria show higher abundance in the inner Bay, while the species of genera Anchoviella show an ample distribution, without a particular zone of higher occurrence. Seasonally, only A. januaria, A. lepidentostole and A. brevirostris presented a clear pattern of occurrence, peaking in the Autumn.A abundância relativa e distribuição espacial de juvenis de peixes da familia Engraulididae ocorrentes na Baía de Sepetiba, Rio de Janeiro, Brasil, foram estudadas visando determinar os padrões de uso da margem continental durante a fase inicial de vida. Dois ciclos anuais (Março-1996 a Fevereiro-1997 e Março-1997 a Fevereiro-1998 foram investigados através de um total de 120 amostragens de arrastos de praia, distribuídas em 5 locais de coleta na margem continental da Baía, duas delas situadas na zona mais interna e três na zona mais externa e próxima do limite com o mar. Foram identificados 6 espécies de Engraulididae, compreendendo dois gêneros: Anchoa januaria, Anchoa marinii, Anchoa tricolor, Anchoa lyplepis, Anchoviella lepidentostole e Anchoviella brevirostris, sendo a maioria das espécies representada por juvenis na fase inicial de vida. A. januaria, A. brevirostris, A. lepidentostole e A. tricolor, nesta ordem, foram as espécies de maior abundância numérica, enquanto A. tricolor e A. januaria, foram as de maior contribuição em peso, correspondendo em conjunto á aproximadamente 90% do total de peixes. Espacialmente, A. tricolor, A. lyolepis e A. marinii distribuiram-se na zona mais externa da Baía. A. januaria apresentou maior abundância na zona mais interna da Baía, enquanto as espécies do gênero Anchoviella distribuiram-se amplamente na Baía, não apresentando um padrão definido de ocorrência espacial. Sazonalmente, somente A. januaria, A. lepidentostole e A. brevirostris apresentaram um padrão definido, com maior abundância no Outono.

  14. Eoalosa janvieri gen. et sp. nov., a new clupeid fish (Teleostei, Clupeiformes) from the Eocene of Monte Bolca, Italy.

    Science.gov (United States)

    Marramà, Giuseppe; Carnevale, Giorgio

    2018-01-01

    Fishes of the family Clupeidae are extremely abundant in the Eocene fossiliferous limestone of Monte Bolca representing the most common group from this celebrated locality. A new clupeid from the Pesciara site, Eoalosa janvieri gen. et sp. nov., is described. The new taxon exhibits a unique combination of characters supporting its recognition as a new genus and species of clupeid fish that is tentatively placed in the subfamily Alosinae. The description of this new taxon improves our knowledge of the diversity of clupeoid fishes in the Eocene of Monte Bolca.

  15. Alimentación del pez insectívoro neotropical Creagrutus bolivari (Pisces: Characidae según los métodos gráfico y de importancia relativa

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    Mario Ortaz

    2006-12-01

    Full Text Available Se estudió la alimentación de un pez neotropical (Creagrutus bolivari usando diferentes métodos: el método gráfico de Cortés (1997 y dos índices de importancia relativa (George y Hadley, 1979 (% RIi y Cortés, 1997 (% IRIi. Sólo las presas discretas (invertebrados acuáticos y terrestres se emplearon en el análisis de dieta. Se estimó ara cada ítem, las frecuencias de aparición (% A, numérica (% N y gravimétrica (% G. Se analizó un total de 240 ejemplares (intervalo de talla desde 25.3 hasta 64.7 mm de longitud estándar. Para valores de % A > 50 %, el % IRIi resultó mayor al obtenido para el % RIi, con una tendencia opuesta (hasta 130 veces para valores de % A por debajo del 50 %. El % IRIi sobreestimó la importancia relativa de las presas para valores altos de % A, mientras que subestimó la importancia relativa de las presas para valores bajos de % A y mostró un comportamiento no lineal a medida que varió el % A. Las variables empleadas en el método gráfico de Cortés son insuficientes para evaluar la estrategia alimentaria del depredador (generalismo-especialismo. De este modo, se sugiere incluir otras variables como el ancho de nicho trófico poblacional e individual así como un adecuado registro de campo. Es necesario un amplio registro de campo para clasificar a las presas como escasa o dominante de acuerdo a la clasificación de Cortés. Los índices compuestos que incluyen las variables: masa, número y aparición proporcionan una descripción más precisa de la dieta y permiten realizar estudios comparativos. El análisis gráfico es fácil de interpretar y ayuda a evaluar aspectos como la importancia de la presa y la estrategia alimentaria del depredadorThe diet of the neotropical insectivorous fish Creagrutus bolivari (Pisces: Characidae according to the "graphic" and "relative importance" methods. The diet of a neotropical fish species (Creagrutus bolivari was studied using different methods: the Cortés 1997

  16. Early ontogeny of Labeo capensis (pisces: Cyprinidae)

    African Journals Online (AJOL)

    the early development of Indian Labeo species (e.g. Khan. 1925; Ahmad 1944 ...... ber, size or intensity, was helpful in grouping North American cyprinid larvae. .... impregnated eggs of common freshwater fishes of Bengal. Curro Sci. 26: 125 ...

  17. Morphometric Variations in Sarotherodon melanotheron (Pisces ...

    African Journals Online (AJOL)

    komla

    Fishing was done by means of cast nets of 45 and 50 mm mesh ... Counts were made one where two rays had a common root. ... Chi-square ... lines might have occurred as a result of environmental fluctuations, especially water temperature.

  18. Monograph On Bothid Larvae (Pleuronectiformes - Pisces)

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    in the preparation of a descriptive document on the larvae of flat fishes from the Indian Ocean. However, study of the larval forms from the Indian Ocean has been made possible due to the availability of material from the Naga Expedition (1959-61) from the Gulf...

  19. ECOLOGIE ALIMENTAIRE DE Brycinus macrolepidotus (PISCES ...

    African Journals Online (AJOL)

    AISA

    ... Brycinus macrolepidotus provenant de la rivière Bia. Diet composition and Index of Relative Importance (IRI) of B. macrolepidotus species from the Bia river. n = nombre de spécimens examinés, lac = stations de Bakro et d'Ayamé. n = number of analyzed specimens; lake = Bakro and Ayamé stations. Poissons. Dytiscidae.

  20. Age and growth of Sandelia bainsii Castelnau (Pisces: Anabantidae ...

    African Journals Online (AJOL)

    1987-03-02

    Mar 2, 1987 ... relationship between fish length and both scale and otolith radii. Growth rings were ... An understanding of age and growth of this species was required to determine the ..... extinction (Mayekiso & Hecht 1988). Over 70% of the.

  1. Final report on the Swedish participation in PISC II

    International Nuclear Information System (INIS)

    Hoegberg, K.; Zettewall, T.

    1986-08-01

    The aim of the project is to evaluate the reliability of test methods for reactor pressure vessels and to identify the proper methods for defect control and to inform about the results. Four test plates planted defect have been investigated by 50 testing teams from 13 countries. Swedish testing has shown acceptable data for the detection of defects when using high sensitivity tests. (G.B.)

  2. 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.

  3. Stock separation and life history of Argyrozona argyrozona (Pisces ...

    African Journals Online (AJOL)

    Otolith readability and growth rates varied between regions, with fish from the Eastern Cape (Port Elizabeth and Port Alfred combined) having the lowest average percentage error (4.82 vs 5.33 and 7.03) and the slowest growth rates. Size-at-50% maturity (L50) varied regionally, female fish in the Eastern Cape maturing at a ...

  4. Age and growth of Cape stumpnose Rhabdosargus holubi (Pisces ...

    African Journals Online (AJOL)

    We examined and counted the opaque zones in the sectioned otoliths of 134 R. holubi to determine its age and growth parameters. The otoliths from two recaptured fish marked with oxytetracycline confirmed that one opaque zone was deposited annually. The species reached a maximum age of 18 years and growth was ...

  5. Age and growth of Sandelia bainsii Castelnau (Pisces: Anabantidae ...

    African Journals Online (AJOL)

    Otoliths and scales were used for age and growth determination of Sandelia bainsii. There was a linear relationship between fish length and both scale and otolith radii. Growth rings were deposited annually in spring. Otoliths provide a more reliable estimate of age and growth than scales. Males grow faster, reach a larger ...

  6. (PISCES: CHARACIDAE)IN LAKE MclLWAINE, RHODESIA

    African Journals Online (AJOL)

    , but the species is of little economic importance in the lake. The breeding season is short and coincides with the main river floods. Females are larger than males and fecundity is extremely high. Like other A/este.t species it is a very versatile ...

  7. Karyological characterization of Mugil trichodon Poey, 1876 (Pisces: Mugilidae

    Directory of Open Access Journals (Sweden)

    Mauro Nirchio

    2005-12-01

    Full Text Available Cytogenetic studies were conducted on Mugil trichodon from Margarita Island, Venezuela. The species showed a karyotype 2n=48 with entirely acrocentric chromosomes (Arm number, NF=48. Chromosomes gradually decreased in size and did not allow a clear distinction of homologues, except for one marker pair, which showed a conspicuous secondary constriction. C-banding showed heterochromatic blocks restricted at the centromeric regions of all the chromosomes. Some were more obvious than others, with the exception of the chromosome pair that had a secondary constriction with entirely heterochromatic short arms. Sequential staining with Giemsa and AgNO3 demonstrated the conspicuous secondary constrictions corresponding to the NORs, and these had significant intraindividual size variations between both homologous chromosomes. The data obtained here support the contention that Mugilidae have a conservative chromosome macrostructure and reinforce the hypothesis that small structural chromosome rearrangements involving active NOR sites are the main cause of the karyotypic diversification seen in this group.

  8. Reproductive Biology of Gerres Oyena (Pisces: Gerreidae) Along ...

    African Journals Online (AJOL)

    Western Indian Ocean Journal of Marine Science. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 6, No 1 (2008) >. Log in or Register to get access to full text downloads.

  9. Management of Argyrozona argyrozona (Pisces: Sparidae) in South ...

    African Journals Online (AJOL)

    It is shown that the current length at first capture (Lc) of 250mm TL and F (at M = 0.1) will reduce Egg/R to 6.41% of the pristine value in the eastern Agulhas Bank population and to between 6.06% and 14.15% on the central Agulhas Bank, indicating that both stocks are heavily overfished. An increase in Lc from 250mm to ...

  10. Differences in meristic counts of the genus Clarias (pisces: clariidae ...

    African Journals Online (AJOL)

    Specific differences in meristic counts were exhibited in both the anal fin ray count and the vertebral count in the clariids of Anambra rver, Nigeria. There was a close numerical relationship between the number of anal fin rays and the number of vertebrae. The present study further justifies the taxonomic importance of anal fin ...

  11. Relative gut lengths of coral reef butterflyfishes (Pisces: Chaetodontidae)

    KAUST Repository

    Berumen, Michael L.; Pratchett, Morgan S.; Goodman, Brett Alexander

    2011-01-01

    Variation in gut length of closely related animals is known to generally be a good predictor of dietary habits. We examined gut length in 28 species of butterflyfishes (Chaetodontidae), which encompass a wide range of dietary types (planktivores, omnivores, and corallivores). We found general dietary patterns to be a good predictor of relative gut length, although we found high variation among groups and covariance with body size. The longest gut lengths are found in species that exclusively feed on the living tissue of corals, while the shortest gut length is found in a planktivorous species. Although we tried to control for phylogeny, corallivory has arisen multiple times in this family, confounding our analyses. The butterflyfishes, a speciose family with a wide range of dietary habits, may nonetheless provide an ideal system for future work studying gut physiology associated with specialization and foraging behaviors. © 2011 Springer-Verlag.

  12. The major results of the PISC II RRT

    International Nuclear Information System (INIS)

    Crutzen, S.; Jehenson, P.; McDonald, N.

    1989-01-01

    Non Destructive Testing (NDT) forms part of the in-service inspection (ISI) of a reactor pressure vessel (RPV) and its associated pressure circuit, and the results of the NDT are used in conjunction with fracture mechanics or as part of a code-defined treatment to assess the significance of flaws. Detection, location and sizing of crack-like flaws play an important role in helping to establish the integrity of these reactor steel structures. (orig.)

  13. Age and growth of Clarias gariepinus (Pisces : Qariidae)

    African Journals Online (AJOL)

    in growth can therefore be interpreted from optically distinct wnes in the .... The section on the slide was then ground on silicon carbide water paper (grit sizes ... A drop of metQyl salicylate. BP was then ...... A note on the properties of the P.K. Ie.

  14. Reproductive Biology of Gerres Oyena (Pisces: Gerreidae) Along ...

    African Journals Online (AJOL)

    The reproductive biology of Gerres oyena (Forskal, 1775) (Gerreidae) along the Bagamoyo coast was studied from January to December 1999 using samples from monthly commercial catches. Size at first maturity was 12.8 and 13.9 cm TL for males and females respectively. The sex ratio was found to be 0.98:1 (m:f) and ...

  15. Gymnothorax phalarus, a new eastern Pacific moray eel (Pisces: Muraenidae

    Directory of Open Access Journals (Sweden)

    William A. Bussing

    1998-06-01

    Full Text Available Gymnothorax phalarus is described from 23 individuals taken in trawl and dredge collections made on the Pacific coast of Costa Rica. The new species is nearly always syntopic with a similar species, Gymnothorax equatorialis. The new moray is distinguished by its white-spotted pattern, uniserial, slightly serrated teeth in adults, four infraorbital pores and mean vertebral formula of 6-58-140. Of the total of 21 valid species of morays recorded from the Pacific coast of Costa Rica, only the new species and G. equatorialis form part of the trawl fishery as the remainder are almost entirely restricted to nearshore rocky habitats. The known range of G. phalarus is from Baja California to Peru.Gymnothorax phalarus se describe con base en 23 individuos de colecciones hechas por redes de arrastre y dragas en la costa Pacífica de Costa Rica. La especie nueva es casi siempre sintópica con la especie similar, Gymnothorax equatorialis. La nueva morena se distingue por su patrón de puntos blancos, dientes ligeramente aserrados y uniseriales en adultos, cuatro poros infraorbitales y MVF (Fórmula de Vértebras de 6-58-140. México a Perú.

  16. Régime alimentaire de Pomadasys jubelini (Pisces, Haemulidae ...

    African Journals Online (AJOL)

    Administrateur

    cæcums pyloriques également très développés sont présents au niveau du pylore. L'intestin, relativement court, est plié en 3. La figure 3 présente la relation entre la longueur de l'intestin et la longueur standard des poissons. Cette figure montre une relation linéaire d'équation y = 1,17x -12,99 entre les variables étudiées.

  17. Density of Trematocranus placodon (Pisces: Cichlidae)

    DEFF Research Database (Denmark)

    Madsen, Henry; Stauffer, Jay R

    2011-01-01

    . was negatively related to density of Trematocranus placodon, the most common of the snail-eating fishes in the shallow water of Lake Malawi. Both these snails are consumed by T. placodon. Transmission of S. haematobium through B. nyassanus only occurs in the southern part of the lake and only at villages where...

  18. Barcoding and Phylogenetic Inferences in Nine Mugilid Species (Pisces, Mugiliformes

    Directory of Open Access Journals (Sweden)

    Neonila Polyakova

    2013-10-01

    Full Text Available Accurate identification of fish and fish products, from eggs to adults, is important in many areas. Grey mullets of the family Mugilidae are distributed worldwide and inhabit marine, estuarine, and freshwater environments in all tropical and temperate regions. Various Mugilid species are commercially important species in fishery and aquaculture of many countries. For the present study we have chosen two Mugilid genes with different phylogenetic signals: relatively variable mitochondrial cytochrome oxidase subunit I (COI and conservative nuclear rhodopsin (RHO. We examined their diversity within and among 9 Mugilid species belonging to 4 genera, many of which have been examined from multiple specimens, with the goal of determining whether DNA barcoding can achieve unambiguous species recognition of Mugilid species. The data obtained showed that information based on COI sequences was diagnostic not only for species-level identification but also for recognition of intraspecific units, e.g., allopatric populations of circumtropical Mugil cephalus, or even native and acclimatized specimens of Chelon haematocheila. All RHO sequences appeared strictly species specific. Based on the data obtained, we conclude that COI, as well as RHO sequencing can be used to unambiguously identify fish species. Topologies of phylogeny based on RHO and COI sequences coincided with each other, while together they had a good phylogenetic signal.

  19. (Pisces, Cyprinidae) in Wuras Dam, a shallow, turbid impoundment

    African Journals Online (AJOL)

    tooname in liggaamsmassa. Suksesvolle voortplanting is afhanklik van geskikte vloedtoostande gedurende die brooiseisoen wat vanaf November tot Maart of April strek. Die vis het blykbaar in. Wurasdam gebrooi. AI die wyfies het nie gelyktydig kuitgeskiet nie en daar is aanduidings dat individue meer as een maal per sei-.

  20. (Pisces, Cyprinidae) from the eastern Cape Province, South Africa

    African Journals Online (AJOL)

    1990-03-05

    Mar 5, 1990 ... small, aligned in regular rows, indistinct on nape and embedded between pectoral fins and antero-ventral region. .... major row teeth of Barbus omfltolicus sp.nov. B - Posterior view of the right pharyngeal bone and teeth of B. onwtoiicus sp.nov. Scale bar is 1 mm. 191. Figure 4 The nuptial tubercles on the ...

  1. Bothid larvae (Pleuronectiformes-Pisces) of the Indian Ocean

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    the Indian Ocean, their regional, seasonal as well as diurnal variations. Engyprosopon grandisquamis dominated contributing to 23.2% of the total larvae. Numerically the incidence of bothid larvae suggested a uniform pattern of distribution during the two...

  2. Interpretation of PISCES -- A RF antenna system experimental results

    International Nuclear Information System (INIS)

    Rothweil, D.A.; Phelps, D.A.; Doerner, R.

    1995-10-01

    The paper describes experimental data from rf coupling experiments using one to four coil antenna arrays that encircle a linear magnetized plasma column. Experimental results using single turn coil that produce symmetric (i.e. m = 0), dipole (m = 1), and radial rf magnetic fields for coupling to ion waves are compared. By operating without a Faraday shield, it was observed for the first time that the plasma resistive load seen by these different antenna types tends to increase with the number of turns to at least the second power. A four-turn m = 0 coil experienced a record 3--5 Ω loading, corresponding to over 90% power coupling to the plasma. A four-turn m = 1 coil experienced up to 1--1.5 Ω loading, also higher than previous observations. First time observations using a two coil array of m = 0 coil are also reported. As predicted, the loading decreases with increasing phase between coil from 0 degree to 180 degree. Experiments using four coil arrays were difficult to optimize and interpret primarily due to complexity of the manual tuning. To facilitate this optimization in the future, a proposed feedback control system that automatically matches load variations between 0.2 and 10 Ω is described

  3. Distribution and reproduction of the reef fish Petrus rupestris (Pisces ...

    African Journals Online (AJOL)

    1988-05-06

    May 6, 1988 ... functional sexes, and the occurrence of sexual dichromatism, are described. Sexual maturity ... noted that spawning fish are found off the east coast of. South Africa. ...... species arid ecosystem approach to conservation. If sited.

  4. Relative gut lengths of coral reef butterflyfishes (Pisces: Chaetodontidae)

    KAUST Repository

    Berumen, Michael L.

    2011-06-17

    Variation in gut length of closely related animals is known to generally be a good predictor of dietary habits. We examined gut length in 28 species of butterflyfishes (Chaetodontidae), which encompass a wide range of dietary types (planktivores, omnivores, and corallivores). We found general dietary patterns to be a good predictor of relative gut length, although we found high variation among groups and covariance with body size. The longest gut lengths are found in species that exclusively feed on the living tissue of corals, while the shortest gut length is found in a planktivorous species. Although we tried to control for phylogeny, corallivory has arisen multiple times in this family, confounding our analyses. The butterflyfishes, a speciose family with a wide range of dietary habits, may nonetheless provide an ideal system for future work studying gut physiology associated with specialization and foraging behaviors. © 2011 Springer-Verlag.

  5. A new species of iguana Brachylophus Cuvier 1829 (Sauria: Iguania: Iguanidae) from Gau Island, Fiji Islands.

    Science.gov (United States)

    Fisher, Robert N; Niukula, Jone; Watling, Dick; Harlow, Peter S

    2017-06-06

    The south Pacific iguanas (Brachylophus) currently have three recognized living species in Fiji.  Recent surveys have uncovered more specific variation (morphological and genetic) within the genus and have better defined the geographic ranges of the named species.  One of these recent discoveries is a strikingly different iguana from all other island populations in Fiji which is restricted to Gau Island of the Lomaiviti Province.  Gau is the fifth largest island in Fiji and maintains excellent upland forests in the higher elevations.  We describe this population from Gau Island as a new species, Brachylophus gau sp. nov., in recognition of its type locality.

  6. A new species of iguana Brachylophus Cuvier 1829 (Sauria: Iguania: Iguanidae) from Gau Island, Fiji Islands

    Science.gov (United States)

    Fisher, Robert N.; Niukula, Jone; Watling, Dick; Harlow, Peter S.

    2017-01-01

    The south Pacific iguanas (Brachylophus) currently have three recognized living species in Fiji.  Recent surveys have uncovered more specific variation (morphological and genetic) within the genus and have better defined the geographic ranges of the named species.  One of these recent discoveries is a strikingly different iguana from all other island populations in Fiji which is restricted to Gau Island of the Lomaiviti Province.  Gau is the fifth largest island in Fiji and maintains excellent upland forests in the higher elevations.  We describe this population from Gau Island as a new species, Brachylophus gau sp. nov., in recognition of its type locality.

  7. Distribution and size of the mojarra Diapterus rhombeus (Cuvier (Actinopterygii, Gerreidae in a Southeastern Brazilian bay

    Directory of Open Access Journals (Sweden)

    Marcus Rodrigues da Costa

    2012-06-01

    Full Text Available Diapterus rhombeus is one of the most abundant fish species in the Sepetiba bay, which is a 520 km² semi-closed coastal area in Southeastern Brazil. The size and distribution of this species have been described in order to assess the use of the area as a rearing ground in both spatial and temporal (seasonal dimensions. A fish sampling program was conducted monthly by using an otter trawl between October 1998 and September 1999, in three bay zones (outer, middle and inner, defined according to depth and salinity gradient. Highly significant differences were found for CPUEs (number and biomass among seasons and zones. Size ranged from 50 to 230 mm TL, and three size-groups were defined according to a maturation scale (n = 1435: 1 - immature ( 100 mm TL. Immature and L50 individuals were more abundant (number and biomass during Autumn in the inner zone, while adults (L100 predominated during Summer in the outer zone. Evidences of movements of young-of-the-year (50-90 mm TL individuals from the inner to the outer zone were detected as they reach larger sizes (180 mm TL in the second year of life. Condition (k was higher in larger sized individuals in the outer zone during Spring, when they are apt to start the reproductive process. Two cohorts were detected according to modal progression: the first (smaller size showing faster growth than the second, evidencing a slower growth rate as they reach larger size. Distinct size classes occupying different bay zones suggest that the age-groups optimize their coexistence by partitioning the available resources, avoiding intra-specific competition.Diapterus rhombeus é uma das espécies de peixes mais abundantes na Baia de Sepetiba, ambiente costeiro de 520 km² de área semifechada no sudoeste do Brasil. O tamanho e distribuição dos indivíduos desta espécie foram descritos com o objetivo de determinar o uso das áreas de criação numa dimensão espacial e temporal (sazonal. Um programa de amostragem de arrasto de fundo foi conduzido mensalmente entre outubro 1998 a setembro 1999, em três zonas da baía (externa, central, interna, definidas através de gradientes de profundidade e salinidade. Diferenças altamente significativas foram encontradas para CPUEs (número e biomassa entre estações do ano e zonas. O comprimento variou de 50 a 230 mm CT. Três grupos de tamanhos foram definidos de acordo com uma escala de maturação gonadal (n = 1435: 1 - imaturo ( 100 mm CT. Imaturos e indivíduos L50 foram abundantes (número e biomassa durante o outono na zona interna, enquanto adultos (L100 predominaram durante o verão na zona externa. Evidências de movimento de indivíduos jovens (50-90 mm CT da zona interna para zona externa foram detectadas conforme os animais foram atingindo maiores tamanhos (180 mm CT, no segundo ano de vida. A condição (k aumentou em indivíduos maiores na zona externa durante a primavera, quando estes se tornam aptos a iniciar o processo reprodutivo. Duas coortes foram detectadas de acordo com a progressão modal: a primeira (menores tamanhos mostrando crescimento mais rápido do que a segunda, evidenciando uma taxa menor de crescimento a medida que atingem maiores tamanhos. Diferentes classes de comprimento ocupando diferentes zonas da baía sugerem que grupos de idades otimizam sua coexistência compartilhando os recursos disponíveis e evitando competição intra-especifica.

  8. Distribution and size of the mojarra Diapterus rhombeus (Cuvier) (Actinopterygii, Gerreidae) in a Southeastern Brazilian bay

    OpenAIRE

    Costa,Marcus Rodrigues da; Albieri,Rafael Jardim; Neves,Leonardo Mitrano; Santos,Alex Braz Lacone; Araujo,Francisco Gerson

    2012-01-01

    Diapterus rhombeus is one of the most abundant fish species in the Sepetiba bay, which is a 520 km² semi-closed coastal area in Southeastern Brazil. The size and distribution of this species have been described in order to assess the use of the area as a rearing ground in both spatial and temporal (seasonal) dimensions. A fish sampling program was conducted monthly by using an otter trawl between October 1998 and September 1999, in three bay zones (outer, middle and inner), defined according ...

  9. Genetic and morphological variations in the Indian mackerel Rastrelliger kanagurta (Cuvier 1817) from the Goa region

    Digital Repository Service at National Institute of Oceanography (India)

    Menezes, M.R.; Naik, S.; Martins, M.

    stream_size 9 stream_content_type text/plain stream_name Proc_Indian_Acad_Sci_(Anim_Sci)_99_457.pdf.txt stream_source_info Proc_Indian_Acad_Sci_(Anim_Sci)_99_457.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset...

  10. Den ecology of Octopus vulgaris Cuvier, 1797, on soft sediment: availability and types of shelter

    Directory of Open Access Journals (Sweden)

    Stelios Katsanevakis

    2004-03-01

    Full Text Available To avoid predation, octopuses select and actively modify shelters (also called dens in the substratum, where they remain most of the time, especially during daylight hours. The main questions that this study deals with are: Is den availability a significant constraint for the distribution of Octopus vulgaris on soft sediment? What kind of dens does O. vulgaris use on soft sediment and what factors affect the selection of one type instead of another? With population density measurements by SCUBA diving and enrichment experiments with artificial dens, we concluded that the availability of solid materials necessary for den construction is a limiting factor for the distribution of O. vulgaris on soft sediment. O. vulgaris used four different types of den on soft sediment: well (a vertical hole in the sediment, rock/stone (the octopus uses a rock or a large stone to dig a cavity under it, shell (an empty shell is used, human origin (a solid material of human origin is used. The relative proportion of the four types of den in the areas studied was: 38.7% human origin, 29.7% well, 21.5% rock/stone, 2.9% shell. Also, 7.3% of the octopuses were found outside their den. The main types of den were found in different relative proportions in relation to the depth, the distance from shore, the octopus size and the granulometry of the sediment.

  11. Worldwide Population Structure in Cuvier’s Beaked Whales: Identification of Units for Conservation

    Science.gov (United States)

    2008-09-01

    Kitchener, Royal Museum of Scotland, Edinburgh, UK; V. Martin, Sociedad para el Estudio de los Cetaceos en el Archipelago Canario (SECAC), Lanzarote, Canary...some delays in setting up the UNSW School of BEES Ancient DNA Laboratory (part of the Molecular Ecology and Evolution Facility; MEEF). These...Flores, University of Valparaiso, Chile; C. Olavarria, Fundación Centro de Estudios del Cuaternario Fuego-Patagonia y Antártica (INACH), Chile; J. L

  12. Morphologic characterisation and elemental distribution of Octopus vulgaris Cuvier, 1797 vestigial shell

    International Nuclear Information System (INIS)

    Napoleao, P.; Reis, C. Sousa; Alves, L.C.; Pinheiro, T.

    2005-01-01

    The elemental composition of mineral structures in marine organisms can provide useful information to reconstruct environmental histories of individuals and distinguish populations or stocks. In cephalopods, as Octopus vulgaris, morpho-physiological description of vestigial shells may contribute to a better understanding of the physiology, of the process involved in the increment growth and may eventually provide important and useful tools for the validation of age determination methods. Nuclear microprobe analysis was used to map chemical elements in O. vulgaris vestigial shell. The maps contain elemental and morphological information, and enabled especially through Cl and Ca distributions to classify bands of concentric rings. The levels of P, Ca and Sr decrease from central region to external rings, while those of S and Cl showed an inverse tendency. Enhanced concentrations of Fe, Cu and Zn were found in external rings, and no significant variations were detected in the K and Br contents. The results indicate that three regions can be established on the basis of the elemental contents distributions. Specially, the P and Ca variability can distinguish rings from central and external regions. The differential incorporation of elements in the vestigial shell observed may reflect environmental and physiological factors that are affecting the life cycle of this species

  13. Functional integrity of Colossoma macropomum (Cuvier, 1816 sperm cryopreserved with enriched extender solutions

    Directory of Open Access Journals (Sweden)

    Raycon Roberto Freitas Garcia

    Full Text Available Cryoprotectant solutions are used to protect the sperm from alterations caused by the low temperature in the cryopreservation process. We evaluated the quality of Colossoma macropomum semen after freezing, using dimethyl sulfoxide (DMSO as a cryoprotectant, combined with two extender solutions (T1 - Solution 1: Glucose 90.0 g/L, Sodium Citrate 6.0 g/L, EDTA 1.5 g/L, Sodium Bicarbonate 1.5 g/L, Potassium Chloride 0.8 g/L, Gentamycin Sulphate 0.2 g/L, and T2 - Solution 2: Glucose 90.0 g/L, ACP(r-104 10.0 g/L. Motility rate and motility time did not differ between T1 and T2 and were lower than fresh semen. The number of normal sperm was significantly different in treatments T1 (15.1% and T2 (21.9%, and both showed a reduction in the percentage of normal sperm compared to fresh semen (57.4%. The values found for the rates of fertilization and hatching, mitochondrial functionality and sperm DNA, did not differ between the treatments (T1 and T2. Regarding membrane integrity, there was a higher percentage of spermatozoa with intact membranes in T1 (53.4% than T2 (43.7%. The extender solutions, combined with 10% DMSO, maintained the sperm DNA intact in almost all the C. macropomum sperm cells, however there was a loss in their functionality.

  14. DINAMIKA EKOLOGI LAUT SULAWESI (WPP 716 SEBAGAI DAYA DUKUNG TERHADAP PERIKANAN MALALUGIS (Decapterus macarellus Cuvier, 1833

    Directory of Open Access Journals (Sweden)

    Puji Rahmadi

    2015-06-01

    Full Text Available Ikan Malalugis adalah ikan pelagis kecil yang merupakan hasil tangkapan utama nelayan di perairan Laut Sulawesi. Pada tahun 2012 dilaporkan bahwa perikanan pelagis kecil menjadi salah satu hasil perikanan yang penting, dan hasil tangkapan yang dominan dari perikanan pelagis kecil tersebut adalah ikan malalugis biru (Decapterus macarellus. Jenis ikan malalugis memiliki sifat bermigrasi dan membentuk gerombolan kecil yang mana sangat dipengaruhi oleh kondisi lingkungannya. Tipe arus pasut di Teluk Manado (Laut Sulawesi merupakan arus pasut bolak balik (reversing current. Banyaknya arus yang begitu aktif merupakan salah satu faktor yang mendukung habitat ikan malalugis. Diduga kekhasan sifat distribusi arus di daerah laut Sulawesi ini yang membuat kelimpahan ikan malalugis relatif tinggi di perairan Sulawesi Utara dibandingkan dengan daerah perairan lainnya di Indonesia. Kelimpahan ikan malalugis yang tinggi mendorong ikan ini menjadi komoditas penting dalam sektor perikanan di Laut Sulawesi. Meski demikian pada tahun 2012 dilaporkan bahwa tingkat produksi ikan malalugis mengalami penurunan. Hal ini diduga karena terlalu tingginya tingkat eksploitasi atau diakibatkan oleh adanya perubahan dalam kondisi ekosistem ikan tersebut di Laut Sulawesi. Oleh karena itu studi ini dilakukan untuk mengkaji tingkat daya dukung lingkungan terhadap keberlangsungan sumberdaya perikanan malalugis di wilayah perairan Laut Sulawesi. Malalugis fish is a small pelagic fish that constitute the main catch of fishermen in the waters of North Celebes Sea. In 2012 it was reported that small pelagic fishery became one of the important fishery products and it was dominated by the species of Malalugis (Decapterus macarellus. This species has a typical behavior which was highly mobility and forming fish schooling and strongly influenced by environmental conditions. The type of tidal current in North Sulawesi coast is reversing current. This kind of current could make a very active current in the water which is suitable for the habitat of Malalugis. This distinctiveness of current was considered as a trigger for relatively high abundance of Malalugis in this area compared to its abundance in other water body of Indonesian territory. In 2012, total catch of this species has been reported to be decreased; thismay caused by either high level of exploitation nor changing on its habitat or even both. This study was conducted to investigate the capability of ecosystem and habitat of Malalugis to support its sustainability.

  15. Reproductive biology of Cetengraulis edentulus (Cuvier, 1829, the major fishery resource in Guanabara Bay, Brazil

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    Ana Clara Sampaio Franco

    Full Text Available Cetengraulis edentulus is a broadely distributed engraulid in Southwest Atlantic, currently accounting for the main fish species commercially exploited at Guanabara Bay, Brazil. This study aimed to extend the knowledge on reproduction of C. edentulus at Guanabara Bay and to test whether some descriptors of reproductive activity, especially the gonadosomatic index (GSI, and the index of reproductive activity (IRA changed among seasons. A total of 978 C. edentulus specimens were retrieved from purse seine commercial landings at Conservas Rubi S.A. company, in São Gonçalo city, RJ. Subsamples of 90-120 individuals were collected from bimonthly yields between July 2010 (winter and June 2011 (autumn. Most fish were adults (120-170 mm TL, in response to the high selectivity of commercial fisheries. All descriptors indicated a broad spawning period (late winter to spring, peaking in November, suggesting this is the critical period to protect C. edentulus stocks from overfishing at Guanabara Bay. Fecundity averaged 12,720 oocytes and was positively related to fish size, GSI and fullness index, indicating that preserving larger individuals (TL > 160 mm could contribute significantly to the reproductive success of C. edentulus, since they produce more oocytes. Cetengraulis edentulus é um engraulídeo amplamente distribuído no Atlântico Sudoeste, sendo um importante recurso comercialmente explorado na baía de Guanabara, Brasil. O presente estudo teve como objetivo ampliar o conhecimento sobre a reprodução de C. edentulus na baía de Guanabara e testar quais descritores da atividade reprodutiva, especialmente o índice gonadossomático (IGS e o índice de atividade reprodutiva (IAR se modificaram ao longo das estações do ano. Um total de 978 indivíduos de C. edentulus foram capturados pelo método de rede de cerco da frota comercial no cais da empresa Conservas Rubi S.A., na cidade de São Gonçalo, RJ. Subamostras de 90-120 indivíduos de C. edentulus foram coletados bimestralmente durante o período de julho de 2010 (inverno e junho de 2011 (outono. A maioria dos indivíduos foram adultos (120-170 mm CT, em resposta a alta seletividade das capturas comerciais. Todos os índices indicaram um amplo período reprodutivo (final do inverno e primavera, com pico em novembro, sugerindo que este seria um período crítico para preservar os estoques de C. edentulusda sobrepesca na baía de Guanabara. A fecundidade média foi de 12720 ovócitos e foi positivamente relacionada com tamanho do peixe, IGS e índice de repleção, indicando que preservar maiores indivíduos (CT > 160 mm poderia contribuir significativamente para o sucesso reprodutivo de C. edentulusna área, visto que esses indivíduos produzem um maior número de ovócitos.

  16. Morphological study of the pineal gland of (crab eater raccoon Procyon cancrivorus (Cuvier, 1798

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    Leandro de Oliveira Marques

    2010-06-01

    Full Text Available The Procyon cancrivorus is a wild carnivore that is widely distributed and relatively common, but it remains little studied, and few works report on the biology of this species. The aim of this work was to characterize morphologically the pineal gland of Procyon cancrivorus through macro, microscopic and radiographic studies, and to compare them with those from other animals. In this work, four adult animals of both sexes were used, originating from the Scientific Herd of CECRIMPAS IBAMA (Process nº 02027.003731/04-76. Macroscopically, the pineal gland of Procyon cancrivorus was located between the occipital lobes of the cerebral hemispheres, cranially to the vermis cerebelar. It was positioned rostrally to the rostral colliculus and caudally to the habenular comissure. Microscopically, the gland was covered externally by a capsule deriving from the meningeal pia mater. The presence of three types of cells was noted in the glandular parenchyma: pinealocytes, glial cells and mast cells. No calcareous concretions in the pineal gland were found in the radiographic and microscopic studies.

  17. Paleoclimate determines diversification patterns in the fossorial snake family Uropeltidae Cuvier, 1829.

    Science.gov (United States)

    Cyriac, Vivek Philip; Kodandaramaiah, Ullasa

    2017-11-01

    Understanding how and why diversification rates vary across evolutionary time is central to understanding how biodiversity is generated and maintained. Recent mathematical models that allow estimation of diversification rates across time from reconstructed phylogenies have enabled us to make inferences on how biodiversity copes with environmental change. Here, we explore patterns of temporal diversification in Uropeltidae, a diverse fossorial snake family. We generate a time-calibrated phylogenetic hypothesis for Uropeltidae and show a significant correlation between diversification rate and paleotemperature during the Cenozoic. We show that the temporal diversification pattern of this group is punctuated by one rate shift event with a decrease in diversification and turnover rate between ca. 11Ma to present, but there is no strong support for mass extinction events. The analysis indicates higher turnover during periods of drastic climatic fluctuations and reduced diversification rates associated with contraction and fragmentation of forest habitats during the late Miocene. Our study highlights the influence of environmental fluctuations on diversification rates in fossorial taxa such as uropeltids, and raises conservation concerns related to present rate of climate change. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Stratégie de Reproduction du Carangidae Trachinotus teraia Cuvier ...

    African Journals Online (AJOL)

    user

    La reproduction de Trachinotus teraia a été étudiée dans la lagune Ebrié au cours de campagnes mensuelles pendant deux années consécutives (février 2004 à janvier 2006). Cette étude se situe dans le cadre d'acquisition de connaissances sur la biologie de Trachinotus teraia en vue d'évaluer son potentiel aquacole.

  19. A Population Consequence of Acoustic Disturbance Model for Cuviers beaked whale (Ziphius cavirostris) in Southern California

    Science.gov (United States)

    2015-09-30

    two sources. The energetics model that will underpin both PCoD models for Md and Zc has also been published (New et al 2013). The full PCoD model...to Zc on SCORE. We will also be able to use the simplified PCoD model for beaked whales currently being developed under the ONR-funded project...34Using an interim PCoD protocol to assess the effects of disturbance associated with US Navy exercises on marine mammal populations”. This project will

  20. The first description of oarfish Regalecus glesne (Regalecus russellii Cuvier 1816) ageing structures

    Science.gov (United States)

    Midway, S.R.; Wagner, Tyler

    2016-01-01

    Despite being a large, conspicuous teleost with a worldwide tropical and temperate distribution, the giant oarfish Regalecus spp. remain very rare fish species in terms of scientific sampling. Subsequently, very little biological information is known about Regalecus spp. and almost nothing has been concluded in the field of age and growth (Roberts, 2012). No studies of otoliths or temporal (annual) markings on any hard structures have been reported, and to our knowledge otoliths have never been recovered from any specimens (Tyson Roberts, personal communication),although a few texts do provide illustrations of Regalecus sp. otoliths (Lin and Chang, 2012; Nolf, 2013). Further inferential difficulty comes from the fact that age and growth studies of any Lampridiforme species are rare. Lampris guttatus is perhaps the only Lampridiforme species for which any biological information has been reported(Francis et al., 2004), which stems from the species commercial value. In order to begin understanding any species (for later purposes of management, conservation, etc.), basic biological information is needed. In the present study, we examine not only the first Regalecus russellii otolith, but provide suggestions toward future work that should direct data collection that can be used to generate basic biological information for this species.

  1. Regional movements of the tiger shark, Galeocerdo cuvier, off Northeastern Brazil: inferences regarding shark attack hazard.

    Science.gov (United States)

    Hazin, Fábio H V; Afonso, André S; De Castilho, Pedro C; Ferreira, Luciana C; Rocha, Bruno C L M

    2013-09-01

    An abnormally high shark attack rate verified off Recife could be related to migratory behavior of tiger sharks. This situation started after the construction of the Suape port to the south of Recife. A previous study suggested that attacking sharks could be following northward currents and that they were being attracted shoreward by approaching vessels. In this scenario, such northward movement pattern could imply a higher probability of sharks accessing the littoral area of Recife after leaving Suape. Pop-up satellite archival tags were deployed on five tiger sharks caught off Recife to assess their movement patterns off northeastern Brazil. All tags transmitted from northward latitudes after 7-74 days of freedom. The shorter, soak distance between deployment and pop-up locations ranged between 33-209 km and implied minimum average speeds of 0.02-0.98 km.h-1. Both pop-up locations and depth data suggest that tiger shark movements were conducted mostly over the continental shelf. The smaller sharks moved to deeper waters within 24 hours after releasing, but they assumed a shallower (shark movements in the South Atlantic, this study also adds new information for the reasoning of the high shark attack rate verified in this region.

  2. Recognizing cephalopod boreholes in shells and the northward spread of Octopus vulgaris Cuvier, 1797 (Cephalopoda, Octopodoidea)

    NARCIS (Netherlands)

    Hiemstra, Auke-Florian

    2015-01-01

    Octopuses prey on molluscs by boring through their shell. Among the regular naticid borings, traces of cephalopod predation should be found soon on Dutch beaches. Bottom trawling has declined, and by the effects of global warming Octopus will find its way back to the North Sea where it lived before.

  3. Morphologic characterisation and elemental distribution of Octopus vulgaris Cuvier, 1797 vestigial shell

    Energy Technology Data Exchange (ETDEWEB)

    Napoleao, P. [Departamento de Biologia Animal, Faculdade de Ciencias de Lisboa, C2, Campo Grande 1749-016, Lisbon (Portugal); Reis, C. Sousa [Departamento de Biologia Animal, Faculdade de Ciencias de Lisboa, C2, Campo Grande 1749-016, Lisbon (Portugal); Alves, L.C. [Laboratotio de Feixes de Ioes, Instituto Tecnologico e Nuclear, Estrada Nacional no. 10, 2685-953 Sacavem, Lisbon (Portugal); Centro de Fisica Nuclear, Universidade de Lisboa, Av. Prof. Egas Moniz 1700, Lisbon (Portugal); Pinheiro, T. [Laboratotio de Feixes de Ioes, Instituto Tecnologico e Nuclear, Estrada Nacional no. 10, 2685-953 Sacavem, Lisbon (Portugal) and Centro de Fisica Nuclear, Universidade de Lisboa, Av. Prof. Egas Moniz 1700, Lisbon (Portugal)]. E-mail: murmur@itn.mces.pt

    2005-04-01

    The elemental composition of mineral structures in marine organisms can provide useful information to reconstruct environmental histories of individuals and distinguish populations or stocks. In cephalopods, as Octopus vulgaris, morpho-physiological description of vestigial shells may contribute to a better understanding of the physiology, of the process involved in the increment growth and may eventually provide important and useful tools for the validation of age determination methods. Nuclear microprobe analysis was used to map chemical elements in O. vulgaris vestigial shell. The maps contain elemental and morphological information, and enabled especially through Cl and Ca distributions to classify bands of concentric rings. The levels of P, Ca and Sr decrease from central region to external rings, while those of S and Cl showed an inverse tendency. Enhanced concentrations of Fe, Cu and Zn were found in external rings, and no significant variations were detected in the K and Br contents. The results indicate that three regions can be established on the basis of the elemental contents distributions. Specially, the P and Ca variability can distinguish rings from central and external regions. The differential incorporation of elements in the vestigial shell observed may reflect environmental and physiological factors that are affecting the life cycle of this species.

  4. Estrutura morfológica do fígado de tambaqui Colossoma macropomum (Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Gerlane de Medeiros Costa

    2012-09-01

    Full Text Available Este trabalho teve como objetivo descrever macro e microscopicamente o fígado do Tambaqui Colossoma macropomum, Teleósteo de água doce da Família Characidae, de grande interesse econômico da bacia Amazônica. Foram utilizados seis (6 exemplares jovens com idade entre seis meses e um ano, oriundos da Chácara Esteio, Alta Floresta, MT, que desenvolve principalmente a prática da piscicultura. O órgão foi fotodocumentado in situ e descrito macroscopicamente, em seguida procedeu-se a retirada de fragmentos deste, que foram processados pelas técnicas histológicas rotineiras para inclusão em parafina e coloração de HE. O fígado localizou-se ventral à bexiga natatória e craniodorsalmente ao estômago, apresentou coloração amarronzada a vermelho, constituído por três lobos hepáticos, o lobo lateral direito, o lobo lateral esquerdo e o lobo ventral. Microscopicamente, o parênquima era constituído por hepatócitos com formato que variou do arredondado irregular hexagonal ao redondo com núcleo grande e central, arranjados em cordões lineares limitados por sinusóides que irradiam para veias centrais, e com ausência de lóbulos hepáticos. As veias centrais estavam distribuídas pelo parênquima, enquanto que o espaço porta, na maioria das vezes, era constituído apenas por uma veia hepática e o ducto biliar, em outros locais foi observado, uma artéria e um ducto. Não foi observada a formação de tríades portais. Foram frequentemente observados melano macrófagos centrais dispersos pelo parênquima. O estudo morfofuncional do Aparelho Digestório de peixes da bacia Amazônica, se faz pertinente com vistas ao conhecimento do aproveitamento de ganho de peso e produção em alta escala para consumo humano e preservação da espécie, além da importância de estarem sendo utilizados como bioindicadores atualmente.

  5. Crecimiento en cautiverio de Crocodylus acutus (Cuvier, 1807 en Tumbes, Perú

    Directory of Open Access Journals (Sweden)

    Oswaldo Pérez

    2013-04-01

    Full Text Available Se evaluó el crecimiento en peso y longitud en 40 individuos del Cocodrilo de Tumbes en el Centro de Acuicultura La Tuna Carranza, localizado en Puerto Pizarro, Departamento de Tumbes. No se observó una diferencia en el incremento en longitud por clases de edad, mientras que en peso si presentaron diferencias siendo mayor en adultos. El crecimiento promedio de longitud y peso fue de 1,44% y 0,18% en crías, 1,30% y 0,10% en reclutas, 1,24 y 0,22% en juveniles, 1,24 y 0,48% en subadultos, y 1,01 y 0,75% en adultos. En general las hembras presentan un mayor crecimiento que los machos.

  6. Feeds and feeding strategies for Colossoma macropomum (Cuvier 1818) : fish growth as related to dietary protein

    NARCIS (Netherlands)

    Meer, van der M.B.

    1997-01-01

    Colossoma macropomum is an indigenous fish species from the Amazon region. The amino acid profile of its body protein proved to be similar to that of other fish species. Soya meal and fish meal have, based on their amino acid profiles, a comparable protein quality. This

  7. Comparative study on octopus vulgaris (cuvier, 1797) from the mediterranean and red sea coasts of egypt

    OpenAIRE

    Riad, R.; Gabr, H.R.

    2007-01-01

    Specimens from common octopus, Octopus vulgaris captured from the Red Sea and Mediterranean Sea showed significant differences in four of seven morphometric measurements .These differences are sufficient to recognize the populations of this species in the two habitats. The computed length-Wight relationship and condition factor for common octopus in both areas showed that representatives of this species from the Red Sea are heavier than those captured from the Mediterranean Sea for the same l...

  8. Morphological and biometric comparison of the scales of the barbels (Barbus cuvier) of Spain.

    Science.gov (United States)

    Miranda, R; Escala, M

    2000-09-01

    The scales of 386 specimens of the eight species of the genus Barbus present in Spain (B. bocagei, B. comiza, B. graellsii, B. guiraonis, B. haasi, B. meridionalis, B. microcephalus, and B. sclateri) were studied. Six scales were extracted from each specimen, measurements taken, and the number of radii noted. Indices were obtained from these data. Statistical analysis allowed two groups to be established: 1) B. meridionalis and B. haasi, living in the upper stretches of rivers and distributed in the north of Spain; and 2) the remaining species. Within both groups a latitudinal gradation in the elongation of the scales and in the proportion of radii of the lateral fields was observed. Copyright 2000 Wiley-Liss, Inc.

  9. 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

    Directory of Open Access Journals (Sweden)

    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.

  10. Dieta e sobreposição de nichos de duas espécies de gerreídeos, Eugerres brasilianus (Cuvier, 1830) e Diapterus rhombeus (Cuvier, 1829) capturadas no canal de Santa Cruz, Itamaracá, Pernambuco.

    OpenAIRE

    Robson Tavares Barbosa

    2012-01-01

    Neste trabalho foram avaliados os perfis sazonais das dietas de Eugerres brasilianus e Diapterus rhombeus, e, a sobreposição alimentar entre estas espécies capturadas no canal de Santa Cruz, localizado no litoral norte do estado de Pernambuco, no período de junho de 2010 a maio de 2011. Teve como objetivo fornecer subsídios que sirvam de base para estudos voltados para o cultivo e uso sustentável destas espécies. Para entender seus hábitos alimentares, foram analisados 837 indivíduos das duas...

  11. Indicios indirectos de la presencia del oso andino (Tremarctos ornatus Cuvier, 1825 en el noroeste de Argentina Indirect evidence on the presence of the Andean bear (Tremarctos ornatus Cuvier, 1825 in northwestern Argentina

    Directory of Open Access Journals (Sweden)

    J. Fernando Del Moral

    2009-06-01

    Full Text Available La presencia de osos andinos (Tremarctos ornatus en Argentina ha sido muy discutida debido a la ausencia de evidencia confirmativa. Muchos expertos en el oso dudan actualmente de su presencia en el país. No obstante, la Selva Tucumano-Boliviana o de Yungas es un ecosistema típico donde se puede encontrar esta especie; particularmente en el área estudiada, el hábitat parece ser de alta calidad para los osos. Entre los años 2001 y 2006, se recopilaron 23 casos de evidencia sobre la presencia de osos andinos en las provincias de Salta y Jujuy. Se registraron huellas, restos alimenticios y heces. Adicionalmente, se entrevistó a nativos, agricultores y cazadores para colectar otros datos sobre la especie. Se concluye que las selvas de Yungas del extremo noroeste de Argentina, deben ser consideradas un área con alta probabilidad de mantener una población residente de osos andinos. Aunque posiblemente esta sea una población aislada y pequeña, la presencia permanente de osos andinos en el noroeste de Argentina no debería ser puesta en duda.The presence of Andean bears (Tremarctos ornatus in Argentina has been disputed due to the absence of confirming evidence. Many Andean bear experts currently doubt on their presence in this country. Nevertheless, the Tucuman-Bolivian Forest or Yungas is a typical ecosystem where this species can be found, particularly in the studied area, in which the habitat appears to be of high quality for bears. Between 2001 and 2006, 23 cases of evidence on the presence of Andean bears in the provinces of Salta and Jujuy were recorded. Footprints, food remains and scats were found. In addition, natives, farmers, and hunters where interviewed to collect new data of this species. The conclusion is that the Yungas Forest of northwestern Argentina must be considered an area with high probability of maintaining a resident population of Andean bears. Although this is probably a small and perhaps isolated population, the permanent presence of Andean bears in northwestern Argentina might not longer be doubted.

  12. Efeito sazonal sobre os ácidos graxos e colesterol do polvo Octopus vulgaris Cuvier 1797 Seasonal effects on fatty acids and cholesterol contents in Octopus vulgaris Cuvier 1797

    Directory of Open Access Journals (Sweden)

    Margarida Maria Monteiro Vasconcelos

    2010-06-01

    Full Text Available Foi realizado um estudo sobre o perfil de ácidos graxos e colesterol na manta de polvo comum, Octopus vulgaris, capturado na praia de Camocim - CE, no decorrer dos meses de abril a outubro em coletas bimensais. Apesar do ácido oleico (C18: 1n9 apresentar comportamento uniforme ao longo do tempo de coleta, a maioria dos demais ácidos graxos foi afetada (p = 1% pela época de coleta. Os níveis dos ácidos araquidônico (C20:4n6, oleico (C18:1n9, esteárico (C18:0 e linoleico (C18:2n6 foram superiores àqueles reportados na literatura. O somatório de ácidos graxos poli-insaturados e monoinsaturados revelou que o óleo de polvo apresenta um teor significativo de ácidos graxos insaturados. Foi observado um aumento gradativo de colesterol ao longo do tempo estudado e um comportamento inverso para a relação de ácidos graxos n3/n6.The aim of this study was to investigate the fatty acids and cholesterol profile in the mantle of common octopus, Octopus vulgaris, collected twice a month in in coastal waters of Camocim/CE beach over the period from April to October. Although the Oleic acid (C18:n9 did not show significant changes over the months, the majority of fatty acids varied during this period of time. The Arachidonic (C20:4n6, oleic (C18:n9, stearic (C18:0, and linoleic (C18:2n6 acids were found in higher levels than those reported in the literature. Polyunsaturated and unsaturated fatty acids accounted for most of the octopus fatty acids. During the time of analysis, it was observed a gradual increase in the cholesterol and the fatty acids n3/ n6 ratio presented the opposite result, i.e., a gradual decrease.

  13. 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

    Directory of Open Access Journals (Sweden)

    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.

  14. Trackline and Point Detection Probabilities for Acoustic Surveys of Cuvier’s and Blainville’s Beaked Whales

    Science.gov (United States)

    2013-09-01

    of sperm whales. Although the methods developed in those papers demonstrate feasibility, they are not applicable to a)Author to whom correspondence...information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and...location clicks (Marques et al., 2009) instead of detecting individual animals or groups of animals; these cue- counting methods will not be specifically

  15. An outbreak of myxozoan parasites in farmed freshwater fish Colossoma macropomum (Cuvier, 1818 (Characidae, Serrasalminae in the Amazon region, Brazil

    Directory of Open Access Journals (Sweden)

    Marcela Videira

    2016-05-01

    Full Text Available The tambaqui (Colossoma macropomum is a native fish species that is farmed most frequently and in the largest quantities throughout Brazil. The high production of this species from fish farms has contributed to the occurrence of emerging parasites, which may compromise fish health and productivity. In a batch of 2500 tambaqui fry acquired for experimental farming procedures in Brazil, a mortality rate of 80% was observed, with the fish swimming erratically and gasping for air at the water surface. From among the specimens that were still alive, 60 individuals were selected at random. Organs or fragments of organs containing lesions and/or cysts were examined under an optical microscope to investigate for the presence of parasitic spores. Of the 60 specimens of tambaqui analyzed, 83.3% were found to be infected in different organs, such as the gills, liver, and gallbladder with myxosporidian species belonging to four genera, namely, Myxobolus, Ellipsomyxa, Henneguya and Thelohanellus. The parasite with the greatest prevalence was Myxobolus sp., located in the gills (70%, followed by Henneguya sp. in the gills region (68.3%, Myxobolus sp. in the liver (63.3%, Thelohanellus sp. in the liver (58.3%, and Ellipsomyxa in the gallbladder (50%. This is the first report of parasitic infection caused by the genera Ellipsomyxa and Thelohanellus in C. macropomum. The present study reported the second incidence of the occurrence of the genus Thelohanellus in South America. This study suggested that the mortality among C. macropomum specimens was caused by the outbreak of myxosporidians. Keywords: Amazon, Tambaqui, Parasite, Myxozoa, Myxosporidians

  16. Population analysis of Scomberomorus cavalla (Cuvier, 1829 (Perciformes, Scombridae from the Northern and Northeastern coast of Brazil

    Directory of Open Access Journals (Sweden)

    EL. Santa Brígida

    Full Text Available Scomberomorus cavalla is a pelagic fish species widely distributed on the Atlantic west coast, and a noticeable decrease in its capture level in the USA and Gulf of Mexico is occurring, compared to the levels reached by the species in the past. Likewise, in some areas of Brazil, there has been indication of over-harvesting. However, there are no molecular studies focusing on the management of such an important item. Thus, in the present study, 380 nucleotide base pairs of the mitochondrial DNA D-Loop region of samples from Macapá, Bragança, and Fortaleza were sequenced. Phylogenetic and population analyses revealed that there is only one panmitic population, and low levels of genetic variability were verified. These results, as well as the noticed over-harvesting of S. cavalla, represent very important data to determine the management of such stock in order to prevent a collapse or the risk of future extinction.

  17. Fatal tiger shark, Galeocerdo cuvier attack in New Caledonia erroneously ascribed to great white shark, Carcharodon carcharias.

    Science.gov (United States)

    Tirard, Philippe; Maillaud, Claude; Borsa, Philippe

    2015-07-01

    To understand the causes and patterns of shark attacks on humans, accurate identification of the shark species involved is necessary. Often, the only reliable evidence for this comes from the characteristics of the wounds exhibited by the victim. The present case report is intended as a reappraisal of the Luengoni, 2007 case (International Shark Attack File no. 4299) where a single shark bite provoked the death of a swimmer by haemorrhagic shock. Our examination of the wounds on the body of the victim, here documented by so-far unpublished photographic evidence, determined that the shark possessed large and homodontous jaws. This demonstrates that the attacker was a tiger shark, not a great white shark as previously published. Copyright © 2015 Elsevier Ltd and Faculty of Forensic and Legal Medicine. All rights reserved.

  18. Advantages of recovery from pre-slaughter stress in tambaqui Colossoma macropomum (Cuvier 1816) agroindustry in the Amazon

    OpenAIRE

    MENDES,Joana Maia; DAIRIKI,Jony Koji; INOUE,Luis Antonio Kioshi Aoki; JESUS,Rogério Souza de

    2017-01-01

    Abstract Tambaqui is the main fish species farmed in the Amazon. It is produced on industrial scale, slaughtered in the field, primarily by post-harvest asphyxia. This procedure, however, is stressful because it depletes energy reserves that should be used in postmortem metabolism, which may compromise fish meat freshness and quality. The present study compared the quality of tambaquis slaughtered by asphyxia, the conventional industrial method, and hypothermia. Tambaquis weighing around 1.6 ...

  19. Prevalence of intestinal parasitic infections in free-ranging Red Panda Ailurus fulgens Cuvier, 1825 (Mammalia: Carnivora: Ailuridae in Nepal

    Directory of Open Access Journals (Sweden)

    Sonam Tashi Lama

    2015-06-01

    Full Text Available The Red Panda Ailurus fulgens is a small carnivore that is adapted to a mainly herbivorous diet.  The present study was conducted to investigate the prevalence of parasitic infections in a free-ranging population of Red Pandas in a community forest in Nepal.  A total of 23 faecal samples were collected and examined.  Protozoa infections were the most common and cestode infections occurred the least.  Our findings suggest that parasites might be a significant problem for the health of the Red Pandas in the study area.  Molecular methods should be used to further investigate the taxonomic position of the parasites and their role in threatening the resilience of Red Panda populations in Nepal.  

  20. Advantages of recovery from pre-slaughter stress in tambaqui Colossoma macropomum (Cuvier 1816 agroindustry in the Amazon

    Directory of Open Access Journals (Sweden)

    Joana Maia MENDES

    Full Text Available Abstract Tambaqui is the main fish species farmed in the Amazon. It is produced on industrial scale, slaughtered in the field, primarily by post-harvest asphyxia. This procedure, however, is stressful because it depletes energy reserves that should be used in postmortem metabolism, which may compromise fish meat freshness and quality. The present study compared the quality of tambaquis slaughtered by asphyxia, the conventional industrial method, and hypothermia. Tambaquis weighing around 1.6 kg were harvested from dugout ponds, transported to experimental tanks and allowed to recover from transport stress for 48h. Biological parameters of fish were evaluated alive post- harvest (Harv, transport (Tr and recovery (Rc, and postmortem analysis was performed in fish slaughtered by asphyxia (Asph or hypothermia (Hyp after transport and recovery. Initial observations showed that the content of total volatile nitrogen bases (TVB-N and pH were higher in fish killed by asphyxia. Sensory analysis indicated that the quality of fish slaughtered immediately after transport was lower than in fish allowed to recover from pre-slaughter stress. The results suggest that recovery from pre-slaughter stress contributes to preserving meat freshness and quality in tambaquis slaughtered on an industrial scale, but other studies are required to determine the feasibility of this recommendation.

  1. Viviparous Monogenea on grey bichir, Polypterus senegalus Cuvier in the National park Niokolo Koba (Senegal, West Africa)

    Czech Academy of Sciences Publication Activity Database

    Přikrylová, I.; Matějusová, I.; Reichard, Martin; Gelnar, M.

    2007-01-01

    Roč. 49, Suppl. 2 (2007), s. 98 ISSN 0048-2951. [International Symposium on Fish Parasites /7./. 24.09.2007-28.09.2007, Viterbo] R&D Projects: GA MŠk LC522; GA AV ČR IAA6093404 Institutional research plan: CEZ:AV0Z60930519 Keywords : Senegal * parasites Subject RIV: EG - Zoology

  2. Temporal Assessment of Natural Radionuclide Bioaccumulation by the Cubera Snapper Fish (Lutjanus Cyanopterus, Cuvier, 1828) from the Brazilian Coast

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, W. S. [Coordenacao de Protecao Radiologica, Unidade de Tratamento de Mineiros (UTM), Industrias Nucleares do Brasil (INB), Pocos de Caldas, MG and Curso de Pos-Graduacao em Biologia Marinha, Instituto de Biologia, Depto. de Biologia Marinha, Universidade Federal Fluminense UFF, Niteroi, RJ (Brazil); Kelecom, A. [Curso de Pos-Graduacao em Biologia Marinha, Instituto de Biologia, Depto. de Biologia Marinha, Universidade Federal Fluminense (UFF), and Programa de Pos-Graduacao em Ciencia Ambiental, Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil); Py, Jr., D. A. [Coordenacao de Protecao Radiologica, Unidade de Tratamento de Mineiros (UTM), Industrias Nucleares do Brasil (INB), Pocos de Caldas, MG (Brazil)

    2013-07-15

    The present study aims to assess the seasonal variation in the accumulation of the isotopes {sup 238}U, {sup 235}U, {sup 234}U, {sup 232}Th, {sup 230}Th, {sup 228}Th, {sup 226}Ra, {sup 228}Ra and {sup 210}Pb in the cubera snapper fish from the coast of the state of Ceara (Brazil). The fish was caught in January (six specimens), June (eight) and September (seven). The uranium and thorium were analysed by electrodeposition, followed by alpha spectrometry. The isotopes of radium and lead were selectively co-precipitated and measured by gross alpha radiometry for {sup 226}Ra and gross beta radiometry for {sup 228}Ra and {sup 210}Pb. No seasonal variations could be observed neither for the uranium and thorium isotopes nor for the {sup 226}Ra isotope. For {sup 228}Ra, the activity concentration in February was equal to that of September, and both were higher than in June. For {sup 210}Pb, the situation was different: the month of February showed a lower activity concentration than in June, which in turn was lower than in September. (author)

  3. Production and quality assessment of fish burger from the grass carp, Ctenopharyngodon idella (Cuvier and Valenciennes, 1844

    Directory of Open Access Journals (Sweden)

    Monjurul Haq

    2013-12-01

    Full Text Available Fish burger was produced from grass carp (Ctenophygodon idella to assess the feasibility of value addition to this low priced fish in Bangladesh. Different food additives (25% mashed potato, 2% NaCl, 2% soybean oil, 2% spices and 0.6% sugar were used to enhance the consumer’s acceptance of the fishery product. Consumers' acceptance of the fish burger was determined by sensory evaluation based on its color, flavor, softness or firmness (S/F, chewy/ rubbery (C/R using 10 point scoring system by a group of 10 untrained judges (20-50 years old. The results were found as follows: color (7.25±1.15, flavor (6.67±1.17, S/F (8.47±1.20 and C/R (7.83±1.23. Evaluation of proximate composition showed that the moisture and protein contents in grass carp mince were 79.15 ± 1.16 % and 18.01±0.44 % respectively which were higher than that of fish burger, 69.46 ± 0.89 % and 16.42 ± 0.57 %, respectively. Lipid (6.64±0.15 % and ash (2.98±0.09 % contents in fish burger were also higher than fish mince. The pH of fish mince and fish burger was 6.8±0.11 and 6.6±0.05 respectively. Therefore, from simple cost-profit analysis, it can be assumed that business of fish burger in Bangladesh has a very good prospect and it would be profitable.

  4. Re-description and Reassignment of the Damselfish Abudefduf luridus (Cuvier, 1830) Using Both Traditional and Geometric Morphometric Approaches

    Energy Technology Data Exchange (ETDEWEB)

    Cooper, W. James [Washington State Univ., Pullman, WA (United States); Albertson, R Craig [Univ. of Massachusetts, Amherst, MA (United States); Jacob, Rick E. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Westneat, Mark W. [Field Museum of Natural History, Chicago, IL (United States)

    2014-12-01

    Here we present a re-description of Abudefduf luridus and reassign it to the genus Similiparma. We supplement traditional diagnoses and descriptions of this species with quantitative anatomical data collected from a family-wide geometric morphometric analysis of head morphology (44 species representing all 30 damselfish genera) and data from cranial micro-CT scans of fishes in the genus Similiparma. The use of geometric morphometric analyses (and other methods of shape analysis) permits detailed comparisons between the morphology of specific taxa and the anatomical diversity that has arisen in an entire lineage. This provides a particularly useful supplement to traditional description methods and we recommend the use of such techniques by systematists. Similiparma and its close relatives constitute a branch of the damselfish phylogenetic tree that predominantly inhabits rocky reefs in the Atlantic and Eastern Pacific, as opposed to the more commonly studied damselfishes that constitute a large portion of the ichthyofauna on all coral-reef communities.

  5. Experimental infection of octopus vulgaris (Cuvier, 1797) with Photobacterium damsela subsp. piscicida. Immunohistochemical tracking of antigen and tissue responses.

    Science.gov (United States)

    Bakopoulos, Vasileios; White, Daniella; Valsamidis, Michail-Aggelos; Vasilaki, Feli

    2017-03-01

    Adult common octopus individuals were intramuscularly infected with Photobacterium damsela subsp. piscicida in order to investigate if this species is sensitive to this common and important fish pathogen. The fate of the bacterial antigens and the tissue responses of Octopus vulgaris were studied employing immunohistochemical techniques. Strong reaction at the site of injection was evident from day 2 post-infection that continued until day 14. Great numbers of hemocytes that were attracted at the site of infection were involved in phagocytosis of bacteria. Very early in the infection, a transition of cells to fibroblasts and an effort to isolate the infection was observed. During the course of the study, very large necrotic cells were seen at the site of infection, whereas during the later stages hemocytes with phagocytosed bacteria were observed in well-defined pockets inside the muscle tissue. None of the internal organs tested for the presence of the bacterium were positive with the exception of the digestive gland where antigen staining was observed which was not associated with hemocyte infiltration. The high doses of bacterial cells used in this experimental infection and the lack of disease signs from Octopus vulgaris suggest that, under normal conditions, octopus is resistant to Photobacterium damsela subsp. piscicida. Copyright © 2017 Elsevier Inc. All rights reserved.

  6. A new artificial reef design for octopus (Octopus vulgaris cuvier, 1797 in the Aegean sea and preliminary results

    Directory of Open Access Journals (Sweden)

    Ali Ula

    2011-01-01

    Full Text Available This study was carried out in the Gulf of 0zmir in the Aegean Sea between June 2006 and November 2008. The purpose was the creation of a new concept of the artificial reef for Octopus vulgaris, with a view to establishing new artificial reef sites to be used in the fisheries management of this species (MPA, NTZ or fishing areas. First, the main characteristics of natural octopus nests were recorded (entrance width, length, etc. by divers. These characteristics were used in the construction of new octahedral artificial reef blocks. The blocks were made of reinforced concrete, in a shape like that of an inverted pyramid, with an upper surface of 100x100x25 cm³ and a lower one of 60x60 cm². Four cylindrical holes each with two ellipsoidal openings were placed in one face and in the lateral edge of the octo-block, to serve as the entrances to the artificial nest. Each nest has a volume of 5000 cm³. Eighty octo-blocks were deployed as artificial reefs at 10 m from each other at 15 different depths at two sites by divers with the help of the winch of the R/V EGESUF. These artificial octo-reefs were censused by direct observation. Twenty-eight octopuses were sampled at the end of 25 dives. Minimum mantle length of the octopuses was 75 mm and the maximum 249 mm, with an average of 152.71 mm. The average total length was calculated to be 918.57 mm. The weight of the specimens was between 244 g and 7140 g with an average of 2335.43 g. The results showed that both sites were inhabited by octopuses coming from the artificial reefs, which used them as nests. These nests seem to have constituted special places for fisheries management and will permit the assessment of reserve areas or marine protection areas (MPA, thus opening up a new perspective for Turkish fisheries.Este estudo foi realizado no golfo de 0zmir, no Mar Egeu, entre junho de 2006 e novembro de 2008. O objetivo foi uma nova concepção de recife artificial para Octopus vulgaris, visando o estabelecimento de novos locais a serem utilizados na gestão da pesca dessa espécie (MPA, NTZ ou zonas de pesca. Primeiramente foram consideradas as principais características dos ninhos naturais do polvo (largura da entrada, comprimento, etc.. A seguir essas características foram utilizadas na construção de novos blocos octaédricos de recifes artificiais. Os blocos foram feitos de concreto armado, assemelhando-se a uma pirâmide invertida, nas dimensões de 100x100x25 cm³ na face superior e 60x60 cm² na face inferior. Quatro furos cilíndricos, com duas aberturas elipsoidais, foram dispostos em uma só face e na borda lateral do octo-bloco, correspondendo às entradas do ninho artificial. Cada ninho tem um volume de 5000 cm³. Foram implantados 80 octo-blocos para servirem como recifes artificiais, guardando a distância de 10 m entre si, em 15 profundidades e em dois locais diferentes, com auxílio de mergulhadores e guincho do R/ V EGESUF. Esses recifes foram recenseados, utilizando-se o método de observação direta. Vinte e oito polvos foram amostrados ao final de 25 mergulhos. O comprimento mínimo do manto do polvo foi de 75 mm e o máximo de 249 mm, com média de 152,71 mm. O comprimento médio total foi determinado em 918,57 mm. O peso dos espécimes ficou entre 244 e 7140 g, com média de 2335,43 g. Os resultados mostram que ambos os locais foram sustentados pelos polvos provenientes dos recifes artificiais, que os utilizaram como ninhos. Esses ninhos parecem constituir locais especiais para manejo da pesca, e permitirão a avaliação de áreas de reserva ou áreas marinhas de proteção (MPA, abrindo, desta forma, novas perspectivas para a pesca turca.

  7. Behavioral Responses of Nave Cuvier’s Beaked Whales in the Ligurian Sea to Playback of Anthropogenic and Natural Sounds

    Science.gov (United States)

    2015-09-30

    University of St Andrews St Andrews , Fife, KY16 8LB, UK phone: (+44) 01334 462630 fax: (+44) 01334 463443 email: plt@st-andrews.ac.uk...exercises and where the whales seldom hear sonar. APPROACH The University of St Andrews was the prime grantee for this project. The PI, Peter Tyack...was ultimately responsible for the project. Leigh Hickmott, also supported through the University of St Andrews , acted as the cruise science lead

  8. Fatal tiger shark, Galeocerdo cuvier attack in New Caledonia erroneously ascribed to great white shark, Carcharodon carcharias

    OpenAIRE

    Tirard, P.; Maillaud, C.; Borsa, Philippe

    2015-01-01

    International audience; To understand the causes and patterns of shark attacks on humans, accurate identification of the shark species involved is necessary. Often, the only reliable evidence for this comes from the characteristics of the wounds exhibited by the victim. The present case report is intended as a reappraisal of the Luengoni, 2007 case (International Shark Attack File no. 4299) where a single shark bite provoked the death of a swimmer by haemorrhagic shock. Our examination of the...

  9. Pacu fish (Cuvier, 1818 (Characiformes: Characidae landed in Porto Velho (Rondônia fish market from 1985 to 2004

    Directory of Open Access Journals (Sweden)

    Maria Alice Leite Lima

    2008-09-01

    Full Text Available This study evaluated various aspects of the profile of pacu (Mylossoma spp., Myleus spp., Metynnis spp. fish marketed on the Cai N’água floating platform of Porto Velho (RO from 1985 to 2004. Inter- and intra-annual variations in yield, variation in fish length and general characteristics of the fishing are reported. The annual pacu yield ranged from 33,000kg to 146,000kg (average = 86,585kg, representing from 6.6% to 20.45% of the total landings in the studied period. These variations followed the hydrologic cycle, and the greatest yields were recorded in the years following the highest water levels. The monthly production ranged from 0 to 42,366kg (average = 5,772kg and it was related to reproductive migration. The pacu presented variations in standard length from 14 to 20cm (18.72cm ± 3.69, mean ± sd. The fishing was based on the use of seines and gill nets and the main environments of capture were tributaries of the low Madeira River (Jamari, Oropiara, Machado and Novo Aripuanã. The CPUE calculated for 2003 to 2005 was 15kg*fisherman 1day-1 (sd = ±21. The results show that the category constituted during this period an important resource for local commercial exploitations, as verified in other regions of the Amazon.

  10. Barracudia australiensis n. g., n. sp (Nematoda: Philometridae) from the obtuse barracuda Sphyraena obtusata Cuvier (Perciformes: Sphyraenidae) off eastern Australia

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Shamsi, S.

    2017-01-01

    Roč. 94, č. 6 (2017), s. 627-634 ISSN 0165-5752 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : yamaguti * fishes * coast Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine OBOR OECD: Veterinary science Impact factor: 1.181, year: 2016

  11. Comparative studies of bile salts. A new type of bile salt from Arapaima gigas (Cuvier) (family Osteoglossidae).

    Science.gov (United States)

    Haslewood, G A; Tökés, L

    1972-03-01

    1. Arapaima gigas bile salts were hydrolysed by alkali or cleaved with dioxan-trichloroacetic acid to give cholic acid, arapaimic acid, arapaimol-A and arapaimol-B. 2. I.r., n.m.r. and mass spectroscopy and [alpha](D) measurements indicated that arapaimic acid and arapaimol-A and -B are respectively 2alpha,3alpha,7alpha,12alpha-tetrahydroxy-5beta,25in-cholestan-26-oic acid, 5beta,25R-cholestane-2beta,3alpha,7alpha,12alpha,26-pentol and 5beta-cholestane-2beta,3alpha,7alpha,12alpha,26,27-hexol. 3. Partial synthesis of 2beta,3alpha,7alpha,12alpha-tetrahydroxy-5alpha- and -5beta-cholan-24-oic acid and their spectral examination fully confirmed these conclusions. 4. A. gigas bile salts show primitive features in that they comprise alcohol sulphates and a C(27) acid; they are also specialized in showing 2beta-hydroxylation.

  12. Lobocapillaria austropacifica n. g., n. sp (Nematoda: Capillariidae) from the obtuse barracuda Sphyraena obtusata Cuvier (Sphyraenidae, Perciformes) off eastern Australia

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Beveridge, I.

    2017-01-01

    Roč. 94, č. 5 (2017), s. 547-556 ISSN 0165-5752 R&D Projects: GA ČR(CZ) GBP505/12/G112 Institutional support: RVO:60077344 Keywords : intestinal parasite * new-caledonia Subject RIV: EG - Zoology OBOR OECD: Zoology Impact factor: 1.181, year: 2016

  13. Diurnal observations on the behavioral ecology of Gymnothorax moringa (Cuvier) and Muraena miliaris (Kaup) on a Caribbean coral reef

    Science.gov (United States)

    Abrams, R. W.; Abrams, M. D.; Schein, M. W.

    1983-09-01

    Activities of muraenids, primarily Gymnothorax moringa and Muraena miliaris, were observed on a Caribbean coral reef with a view to further understanding their role in the reef ecosystem. Other muraenid species included in the total of 198 sightings were Echidna catenata, Enchelycore nigricans, and an unidentified brown moray. The five species were unequally distributed among three basic habitats (sand, coral head, reef rock) available on the reef. Nine particular holes accounted for 52.5% of the total sightings, although hundreds of other seemingly appropriate sites were available. The eels (except M. miliaris) were transient with respect to given holes and particular sections of the reef. While some G. moringa were sighted in the same holes for several consecutive days, M. miliaris individuals remained in the same coral heads throughout the 6-week study period. Muraenids observed in this study showed high tolerances for and were tolerated by other fishes (including other morays) and invertebrates on the reef. They appeared to be opportunistic, roving predators and were not strictly nocturnal. Distinct behavioral interactions and displays between muraenids and reef fish were observed.

  14. Hábitos alimentarios e interacciones tróficas de Anisotremus interruptus (Pisces: Haemulidae y Lutjanus argentiventris (Pisces: Lutjanidae en el Pacífico Central Mexicano

    Directory of Open Access Journals (Sweden)

    Juan R Flores-Ortega

    2014-03-01

    Full Text Available Se obtuvieron estómagos de ejemplares adultos de Anisotremus interruptus y Lutjanus argentiventris para conocer los componentes alimentarios de cada especie y sus interacciones tróficas durante un periodo de surgencia en el Pacífico Central Mexicano. Se identificaron 79 tipos de presas agrupadas en 15 categorías alimentarias. La dieta de A. interruptus está constituida principalmente de microinvertebrados (anfípodos y larvas de crustáceos, holotúridos y ofiuros. L. argentiventris se alimenta de macroinvertebrados (camarones, cangrejos y estomatópodos, peces y cefalópodos. Ambas especies presentan una estrategia alimentaria generalista y una superposición trófica baja. La dieta de estas especies está relacionada con la apertura de la boca.

  15. Hábitos alimentarios e interacciones tróficas de Anisotremus interruptus (Pisces: Haemulidae) y Lutjanus argentiventris (Pisces: Lutjanidae) en el Pacífico Central Mexicano

    OpenAIRE

    Flores-Ortega,Juan R; Avila-Castro,Elizabeth; Haro-Preciado,Hugo J; Godínez-Domínguez,Enrique

    2014-01-01

    Se obtuvieron estómagos de ejemplares adultos de Anisotremus interruptus y Lutjanus argentiventris para conocer los componentes alimentarios de cada especie y sus interacciones tróficas durante un periodo de surgencia en el Pacífico Central Mexicano. Se identificaron 79 tipos de presas agrupadas en 15 categorías alimentarias. La dieta de A. interruptus está constituida principalmente de microinvertebrados (anfípodos y larvas de crustáceos), holotúridos y ofiuros. L. argentiventris se alimenta...

  16. Las especies colombianas del género Brotula (Pisces: Ophidiidae

    Directory of Open Access Journals (Sweden)

    Franke Rebeca

    1995-06-01

    Full Text Available Three species of Brotula are known from Colombian waters. Brotula clarkae Hubbs, 1944, the largest and the most important species to fisheries, is widely distributed in the American Pacific, being exploited in southwest Colombia where it ls abundant and reaches more than 1 m and 8 kg. Brotula ordwayi Hildebrand & Barton, 1949, is the second species known from theAmerican Pacifico It is relatively rare and small, reaching less than 50 cm, and known only from Costa Rica, Gorgona and Talara (Perú. In the Atlantic there is only one species, B. barbata (Schneider, known from two specimens from Santa Marta, Colombian Caribbean.En aguas colombianas existen tres especies de Brotula. La de mayor talla e importancia pesquera es B. clarkae Hubbs, 1944, ampliamente distribuida en el Pacífico americano y explotada en las costas suroccidentales colombianas por su abundancia y por alcanzar más de 1 m y de 8 kg. Brotula ordwayi Hildebrand & Barton, 1949, es el segundo miembro del género presente en el Pacífico americano, pero es relativamente rara, de pequeña talla (menos de 50 cm y se le conoce únicamente de Costa Rica, Gorgona y Talára (Perú. En el Atlántico sólo existe una especie, B. barbata (Schneider, 1801, la cual es conocida del Caribe colombiano a partir de dos ejemplares procedentes de Santa Marta.

  17. Ciclo reproductivo de Lactophrys quadricornis (Pisces: Ostraciidae de la costa nororiental de Venezuela

    Directory of Open Access Journals (Sweden)

    Lilia J. Ruiz

    1999-09-01

    Full Text Available Se estudió la biología reproductiva en Lactophrys quadricornis, de muestras colectadas mensualmente desde mayo 1990 a abril 1991, en el oriente de Venezuela. La proporción sexual no se alejó de la esperada 1:1. La mitad de la población de machos y hembras maduraron a 200 y 222 mm de longitud total (LT, respectivamente. Las tallas mínimas de madurez fueron 160 y 170 mm de L.T en machos y hembras, respectivamente. De acuerdo a la observación macroscópica de las gónadas se establecieron seis estadios de madurez en hembras y tres en machos. El Indice Gonadosomático (IG y los estadios de madurez gonadal sugieren que la especie se reproduce durante todo el año con dos picos de máxima actividad reproductiva: de junio a septiembre, y de enero a febrero. El peso, la longitud de los ovarios y la frecuencia porcentual de hembras en estadios IV y V son evidencias de esa actividad. El desarrollo asincrónico de los ovocitos con diámetros entre 0.399 a 0.930 mm, indica que los desoves son fraccionados. Los valores de la fecundidad oscilaron entre 30 597 a 256 492 óvulos con un promedio de 112 536 ± 57 047.97, observandose un incremento de la fecundidad con la talla y el peso del pez y con el peso y la longitud de los ovarios.Reproductive biology was studied in Lactophrys quadricornis, from samples collected monthly from May 1990 to April 1991 in the east coast of Venezuela. Sex ratio was 1:1; half the population matured at total lenght of 198 mm for males and 222 mm for females. Minimal sizes for maturity was 160 and 170 mm of L.T in males and females, respectively. The Gonadosomatic Index (IG and gonadal maturity stages sugest year around reproduction with two peaks: from June through September, and from January through February. Weight, ovary lenght and frequency of females in stages IV and V, are the evidence. Asynchronous development of the ovocytes with diameters between 0.399 to 0.930 mm, indicates that spawning is fractionate. Mean fecundity was 112 536 ± 57 047.97 eggs, and increases with lenght and weight of the fish and weight and length of the ovaries.

  18. Bothid larvae (Pleuronectiformes - Pisces) of the Gulf of Thailand and South China Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    , Paralichthidae and Bothidae). Kaiyo Kagaku, 11 (2): 100-110 (in Japanese). Amaoka, K., 1984. Bothidae in The fishes of the Japanese Archipelago edited by H. Masuda et al. Tokai Univ. Press. Tokyo. 347-350. 70 LALITHAMBIKA DEVI i Amaoka, K. and E. Yamamoto..., with notes on the species of genus Bothus in Japanese waters. J. Oceanogr. Soc. Jap., 1 (1-2) : 133-140. Kyusin, K., Amaoka, K., Nakaya, K., Ida., H., Tanino, Y. and Senta, T. 1982. Fishes of the S outh China Sea. Japan Fish. Reso. Res. Center, Tokyo 333 pp...

  19. Two new species of Protomyctophum (Pisces, Teleostei, Myctophidae) from the Southern Ocean

    NARCIS (Netherlands)

    Prokofiev, Artém M.

    2004-01-01

    Two new species of the genus Protomyctophum from the Southern Ocean are described. P. mcginnisi n. sp. (from off the Southern Shetland Islands) is most closely related to P. bolini (Fraser-Brunner, 1949), from which it differs in photophore arrangement, in metallic shine of the photophores, and in

  20. TAPEWORMS (CESTODA: CARYOPHYLLIDEA), PARASITES OF CLARIAS BATRACHUS (PISCES: SILURIFORMES) IN THE INDOMALAYAN REGION

    Czech Academy of Sciences Publication Activity Database

    Ash, Anirban; Scholz, Tomáš; Oros, M.; Kar, P. K.

    2011-01-01

    Roč. 97, č. 3 (2011), s. 435-459 ISSN 0022-3395 R&D Projects: GA MŠk LC522; GA ČR GA524/08/0885; GA ČR GAP506/10/1994; GA ČR GD206/09/H026 Institutional research plan: CEZ:AV0Z60220518 Keywords : CESTOIDEA * PLATYHELMINTHES * EVOLUTION * INDIA Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 1.405, year: 2011

  1. Feeding habits of Cataetyx alleni (Pisces: Bythitidae in the deep western Mediterranean

    Directory of Open Access Journals (Sweden)

    Maite Carrassón

    2002-12-01

    Full Text Available This study examines the feeding habits of Cataetyx alleni, the fifth most abundant species below 1000 m depth on the deep slope of the Catalan sea (western Mediterranean, between 1000 and 1800 m depth. Cataetyx alleni is a euryphagic predator, feeding on small epibenthic and endobenthic crustaceans and polychaetes. Predominate prey are small isopods and gammaridean amphipods and, in some cases, endobenthic and epibenthic decapods. Cataetyx alleni has bathymetric changes in diet marked by the capture of different prey-items and also by the reduction in the size of the prey with increasing depth. Seasonal fluctuations in the feeding pattern are clearly seen among the individuals of the same depths.

  2. Pimelodus paranaensis, sp. n., um novo Pimelodidae (Pisces, Siluriformes do Alto Paraná, Brasil

    Directory of Open Access Journals (Sweden)

    Heraldo A. Britski

    1988-01-01

    Full Text Available Descreve-se Pimelodus paranaensis, sp. n., da bacia do Alto Paraná, Brasil, com base em 20 exemplares. A nova espécie pode ser assim diagnosticada: (i dentes presentes e formando duas áreas isoladas no vômer; (ii faixa pré-maxilar de dentes com um ângulo projetado para trás; (iii teto do crânio coberto por pele fina; (iv comprimento da nadadeira adiposa 3,9 a 4,3 vezes no comprimento padrão; (v a maior altura da nadadeira adiposa 3,1 a 4.3 vezes no seu comprimento; (vi região dorsal do corpo de cor castanha com pequenas manchas arredondadas, castanho-escuras. Apesar de possuir dentes vomerianos como em Pimelodus albicans, e como em certos exemplares de P. clarias (sensu Eigenmann & Eigenmann, 1890, achamos que as verdadeiras relações desta nova espécie e sua situação genérica só poderão ser estabelecidas após uma nova boa revisão do grupo.Pimelodus paranaensis, n. sp., from the Upper Paraná basin, is described on the basis of 20 specimens. The new species can be diagnosed as follows: (1 teeth present and forming two isolated on the vomer; (2 premaxillary band of teeth with a backward projecting angle; (3 top of head covered with thin layer of skin; (4 adipose fin basis 3,9 to 4.6 in standard length; (5 greatest depth of adipose fin 3.1 to 4.3 in its length, (6 dark spots along the dorsum. In spite of having teeth on the vomer as Pimelodus albicans, and as some specimens of P. clarias (sensu Eigenmann & Eigenmann, 1890 and in being similar to Bagropsis reinhardti in many respects, we feel that the true relationships and the generic status of the new species can be established only after a thorough revision of the group.

  3. A Bayesian analysis of the parasitic ecology in Jenynsia multidentata(Pisces: Anablepidae

    Directory of Open Access Journals (Sweden)

    Martin M. Montes

    2017-09-01

    Full Text Available ABSTRACT Jenynsia multidentata Jenyns, 1842 (one-sided livebearers are euryhaline viviparous fish of small size, used in the laboratory experiment, important as resource for biological control of mosquito’s larva and a key species to recover eutrophic lakes. Works have been published dealing with parasite biodiversity of this host, but little has been studied about the parasite community ecology. From early 2009 to ends of 2010 specimens of J. multidentata were collected from two places, the Salado Relief Channel (S.R.C. on Samborombón Bay and the Sauce Chico River near to the city of Bahia Blanca (B.B.. All fish were sexed, measured and grouped into sizes/age classes. The fishes from both sites harbored 16 parasitic species: nine digenean, one monogenean, one metacestode, one acanthocephalan, two nematode and two copepods. Lecithaster confusus Odhner, 1905, the metacercariae Hemiuridae gen. sp. indet., metacercariae Thylodelphys sp. (inside the eye, Glossocercus sp. nematode L4 (intestine and Ergasilus sieboldii Nordmann, 1832 are new records for the host. The high number of larval stages made of this fish a link between micro and macroecosystems. The size 2 had the higher biodiversity in both sites, which could be the most suitable age to store the maximal number of parasite of the environment and have a more equitability in their distribution on the host. In B.B. some parasites had higher prevalence and mean abun dance due to the small size of the waterbody compared with the S.R.C. Despite that, in S.R.C. exist a higher specific richness and biodiversity due the daily flow of saline and freshwater and proximity of the sample site to the mouth of the channel in the bay. This is the first approximation to an analysis of the parasitic ecology on this host.

  4. 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.

  5. Molecular systematics and biogeography of the circumglobally distributed genus Seriola (Pisces: Carangidae).

    Science.gov (United States)

    Swart, Belinda L; von der Heyden, Sophie; Bester-van der Merwe, Aletta; Roodt-Wilding, Rouvay

    2015-12-01

    The genus Seriola includes several important commercially exploited species and has a disjunct distribution globally; yet phylogenetic relationships within this genus have not been thoroughly investigated. This study reports the first comprehensive molecular phylogeny for this genus based on mitochondrial (Cytb) and nuclear gene (RAG1 and Rhod) DNA sequence data for all extant Seriola species (nine species, n=27). All species were found to be monophyletic based on Maximum parsimony, Maximum likelihood and Bayesian inference. The closure of the Tethys Sea (12-20 MYA) coincides with the divergence of a clade containing ((S. fasciata and S. peruana), S. carpenteri) from the rest of the Seriola species, while the formation of the Isthmus of Panama (±3 MYA) played an important role in the divergence of S. fasciata and S. peruana. Furthermore, factors such as climate and water temperature fluctuations during the Pliocene played important roles during the divergence of the remaining Seriola species. Copyright © 2015 Elsevier Inc. All rights reserved.

  6. Dietary shifts in Brycinus sadleri (Pisces : Characidae) from southern Lake Victoria

    NARCIS (Netherlands)

    Wanink, J.H.; Joordens, J.C.A.

    2007-01-01

    We studied the diet of Brycinus sadleri in Lake Victoria after extensive environmental changes during the 1980s. To check for diet expansion following these changes, as observed in some other fish species, we compared our results with data from the 1950s. Stomach contents were analysed in relation

  7. Anampses viridis Valenciennes 1840 (Pisces: Labridae)--a case of taxonomic con- fusion and mistaken extinction.

    Science.gov (United States)

    Russell, Barry C; Craig, Matthew T

    2013-01-01

    Anampses viridis Valenciennes 1840 is known from only three specimens collected from Mauritius, and despite intensive sampling, the species has not been seen or reported since it was originally described. This apparent failure to 'rediscover' A. viridis at Mauritius has led to speculation that it is extinct, and the species has been widely cited as an example of a marine fish extinction. Far from being extinct, Anampses viridis has been taxonomically confused and actually is the adult male (terminal phase) colour form and a junior synonym of A. caeruleopunctatus Rüppell 1829, a species that is common and widespread throughout the Indo-West Pacific region.

  8. Food and feeding habits of grey Mullets (Pisces: Mugilidae) in two ...

    African Journals Online (AJOL)

    Food and feeding habits of grey mullets (Mugilidae) in the River Volta and River Pra estuaries in Ghana were studied between February 1997 and July 1998 as part of efforts to encourage their culture. Stomach contents of fish samples, obtained with a cast net and a drag net, were analysed using the 'points' and frequency ...

  9. Growth, feeding and reproduction of the catfish Eremophilus mutisii (Pisces: Trichomycteridae, from artificial reservoirs in Colombia

    Directory of Open Access Journals (Sweden)

    Gabriel Pinilla

    2006-06-01

    Full Text Available The catfish, Eremophilus mutisii, was cultured under different densities in artificial rainfall reservoirs at Caldas, Boyacá, Colombia. At capture, the average total length of the animals was 10 cm and the weight ranged between 9 and 10 g. These fish were in initial stages of sexual development. After a year in the reservoirs, they had increased in length and weight as follows (densities in parentheses: 5.22 cm and 27.23 g (0.5 individuals/m²; 1.98 cm and 8.79 g (1 individual/m², and 2.45 cm and 0.82 g (2 individuals/m². They were at the early stages of sexual maturity, and their condition factor fluctuated between 0.61 and 0.96. They preferably ingested insect larvae that were found in benthic and littoral communities of the reservoirs. The benthos was dominated by ephippia of Daphnia, lumbriculids, and chironomid larvae. The biomass of benthic organisms ranged between 0.1126 and 1.3847 g/m². In the littoral community aquatic insects were the most important component, especially the hemipterans. The biomass of the littoral fauna ranged between 0.14 and 4.05 g/m². Rev. Biol. Trop. 54(2: 589-597. Epub 2006 Jun 01.El "capitán de la sabana", Eremophilus mutisii (Humboldt, 1805, fue cultivado en diferentes densidades en pequeños lagos artificiales localizados en Caldas, Boyacá, Colombia. Al inicio, el promedio de la longitud corporal fue 10 cm y el peso osciló entre 9 y 10 gr. Los peces se encontraban en estados iniciales de desarrollo sexual. Luego de un año de experimentación, los peces cultivados a una densidad de 0.5 ind/m² incrementaron 5.22 cm en longitud y 27.23 gr en promedio (1 ind/m²: 1.98 cm y 8.79 gr; 2 ind/m²: 2.45 cm y 0.82 gr. Los peces se encontraban iniciando su madurez sexual, y su factor de condición fluctuó entre 0.61 y 0.96 y consumían principalmente larvas de insectos. El bentos estaba dominado por efipios de Daphnia, lumbricúlidos y larvas de quironómidos. La biomasa de organismos benticos osciló entre 0.1126 y 1.3847 gr/m². En la comunidad litoral, los insectos acuáticos fueron los componentes mas importantes, especialmente los hemípteros. La biomasa de la fauna litoral osciló entre 0.14 y 4.05 gr/m².

  10. Observations on the reproductive and larval biology of Blennius pavo (Pisces: Teleostei)

    Science.gov (United States)

    Westernhagen, H.

    1983-09-01

    Social behaviour and spawning of adult Blennius pavo kept in the laboratory are described. Eggs are deposited in batches on the walls of artificial spawning places (PVC pipes). One male guards and tends the eggs of different females in one spawning place. Larval hatching occurs in groups according to oviposition. Minimum incubation temperature is around 14 15°C. Larval survival in 1-1 rearing jars is not related to larval total length but to density of larval stock. An experimental population of laboratory reared juvenile and adolescent B. pavo displays a male to female ratio of 1:1.4. Factors possibly influencing the sex ratio of this littoral fish are discussed in view of the situation in its natural environment.

  11. Oocyte adhesiveness and embryonic development of Astyanax bimaculatus (Linnaeus, 1758) (Pisces: Characidae).

    Science.gov (United States)

    Weber, André Alberto; Arantes, Fábio Pereira; Sato, Yoshimi; Rizzo, Elizete; Bazzoli, Nilo

    2013-05-01

    This study shows for the first time the presence of a jelly coat on oocytes of neotropical Characiformes fish. This structure could be responsible for the adhesiveness of Astyanax bimaculatus oocytes, a species widely distributed in South America including in the São Francisco River basin in Brazil. Adult specimens of A. bimaculatus were submitted to artificial reproduction in order to analyse the egg morphology and embryonic development. The eggs were fertilised and kept in incubators with a water temperature of 24°C so that embryogenesis could be monitored. Ovulated and unfertilised oocytes were also collected and submitted to routine histological techniques. Astyanax bimaculatus oocytes were found to be spherical, yellowish, and covered by a thin jelly coat with a slightly adhesive surface. The mean oocyte diameter was 1.03 ± 0.03 mm, the perivitelline space was 0.21 ± 0.02 mm and the jelly coat's thickness was 0.04 ± 0.01 mm. Positive periodic acid-Schiff (PAS) stain and Alcian blue stain pH 2.5 indicated the presence of neutral glycoproteins, and carboxylated acid glycoconjugates on the jelly coat that formed mucosubstances that may be associated with egg adhesiveness. At a water temperature of 24°C, blastopore closure and hatching occurred at 5 h and 17 h after fertilisation, respectively. The results of this study provide essential information for phylogenetic studies and for a better understanding of the reproductive strategy of A. bimaculatus, currently included in the incertae sedis group of the Characidae family due to the lack of monophyly among the families of the group.

  12. Growth, feeding and reproduction of the catfish Eremophilus mutisii (Pisces: Trichomycteridae), from artificial reservoirs in Colombia.

    Science.gov (United States)

    Pinilla, Gabriel; Abril, Maritza; González, Esperanza

    2006-06-01

    The catfish, Eremophilus mutisii, was cultured under different densities in artificial rainfall reservoirs at Caldas, Boyacá, Colombia. At capture, the average total length of the animals was 10 cm and the weight ranged between 9 and 10 g. These fish were in initial stages of sexual development. After a year in the reservoirs, they had increased in length and weight as follows (densities in parentheses): 5.22 cm and 27.23 g (0.5 individuals/m2); 1.98 cm and 8.79 g (1 individual/m2), and 2.45 cm and 0.82 g (2 individuals/m2). They were at the early stages of sexual maturity, and their condition factor fluctuated between 0.61 and 0.96. They preferably ingested insect larvae that were found in benthic and littoral communities of the reservoirs. The benthos was dominated by ephippia of Daphnia, lumbriculids, and chironomid larvae. The biomass of benthic organisms ranged between 0.1126 and 1.3847 g/m2. In the littoral community aquatic insects were the most important component, especially the hemipterans. The biomass of the littoral fauna ranged between 0.14 and 4.05 g/m2.

  13. Garoupa-verdadeira Mycteroperca marginata (Pisces, Serranidae) nos Molhes da Barra de Rio Grande

    OpenAIRE

    Condini, Mario Vinicius Lopes; Seyboth, Elisa; Vieira, João Paes; Garcia, Alexandre Miranda

    2010-01-01

    Escolhida para ilustrar a nota de 100 reais, a garoupa-verdadeira (Mycteroperca marginata) é uma espécie emblemática da fauna brasileira, sendo um dos peixes mais conhecidos da nossa costa. São espécies comuns em ambientes de costões rochosos e recifes ao longo da costa brasileira. Devido ao seu grande porte (algumas espécies podem atingir até 60 Kg) e a excelência da sua carne, as garoupas representam um item importante na pesca (comercial e amadora). Assim como outras espécies da família, a...

  14. The cuckoo wrasse, Labrus mixtus (Pisces: Labridae: biological indices for life history and conservation

    Directory of Open Access Journals (Sweden)

    Sanja Matić-Skoko

    2013-11-01

    Full Text Available The cuckoo wrasse, Labrus mixtus, is widely distributed in the moderate warm waters of the Atlantic Ocean, including the Mediterranean and Adriatic Seas. Generally, labrids are small inshore coastal species susceptible to anthropogenic habitat degradation and, although without commercial importance, they make up a significant part of the by-catch and discard. Also, these fishes are intensively caught in recreational and subsistence fisheries. Basic biological information is required for their stock assessment and conservation. Studies of the age, growth, reproduction and feeding of L. mixtus have not been undertaken previously in the Adriatic Sea. The observed maximum age of the cuckoo wrasse was 10 years, although most of the sampled fish were 7 years old. The estimated parameters of the von Bertalanffy growth model suggested that the growth of L. mixtus was relatively fast in the first four years of life. L. mixtus is a protogynous hermaphrodite and sex change occurred at 26 cm, while the greatest increase in gonadosomatic index in April confirmed spring as the spawning period. The cuckoo wrasse is an opportunistic predator, feeding primarily on crustaceans, gastropods and fishes. The information provided on biological indices is necessary for life history pathways and future conservation measures of this population in the Adriatic Sea.

  15. Frequency-dependence of mating success in Poeciliopsis monacha (Pisces, Cyprinodontiformes reproductive complex, Sonora, Mexico

    Directory of Open Access Journals (Sweden)

    Lima Neuza Rejane Wille

    2002-01-01

    Full Text Available A diversity of all-female fishes of the genus Poeciliopsis coexists with their sexual ancestor species in streams of western Mexico. All-females are hybrids that depend on the sperm of paternal species to reproduce. Rare-female advantage is one of several hypotheses that attempt to explain how the diversity of all-female biotypes is maintained within the Poeciliopsis reproductive complexes. According to this hypothesis, the uncommon all-female biotype has a mating advantage over the common ones and has been maintained by a dynamic equilibrium process. In the P. monacha reproductive complex at Arroyo de los Platanos the density of two all-female biotypes (P. 2monacha-lucida I and II varies across pools. The objective of this study was to analyse fecundity and mating success of females from this arroyo to test the hypothesis. Female mating success was inversely correlated to their density, supporting this hypothesis.

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

    Directory of Open Access Journals (Sweden)

    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. In situ assessment of two catfish species (pisces, Ariidae) to evaluate pollution in a harbor

    Science.gov (United States)

    Neta, Raimunda Nonata Fortes Carvalho; Junior, Audalio Rebelo Torres; Sousa, Débora Batista Pinheiro; de Sousa de Oliveira Mota Andrade, Ticianne; Torres, Hetty Salvino; da Silva Castro, Jonatas; da Silva de Almeida, Zafira; Santos, Débora Martins Silva; Tchaicka, Lígia

    2016-12-01

    A histopathological and biometric database for the catfish Sciades herzbergii and Bagre bagre from São Luís Island (Harbor area) and Caranguejos Island (reference area) in Brazil is presented. Branchial and hepatic lesions were classified into three reaction patterns: 1) circulatory or inflammatory disturbances; 2) regressive changes; 3) progressive changes. The total length (Lt), standard length (Ls), furcal length (Lf), total weight (Wt), and gonad weight (Wg) of each fish were recorded. As expected, most populations of catfish considered in this study are highly heterogeneous, with lengths and weights deviating from the reference sample. No histopathological lesions were observed in Sciades herzbergii examined at the reference site (Caranguejos Island). In contrast, 90% of the catfish S. herzbergii from sites located in the Harbor Area (São Luís Island) had one or more types of branchial and hepatic lesions. As opposed to what was observed in S. herzbergii, more than 86.33% of Bagre bagre individuals showed histopathological alterations in both areas. The utility of histopathological lesions and biometric data as sensitive indicators of the health of wild catfish populations has been demonstrated. Sciades herzbergii proved to be a better species for biomonitoring because it was able to differentiate one impacted site (Port Area/ São Luís Island) from a region relatively free of contaminants (Reference Area/ Caranguejos Island).

  18. Oxidative stress enzyme and histopathological lesions in Colossoma macropomum (pisces, ariidae) for environmental impact assessment

    Science.gov (United States)

    Andrade, Ticianne de Sousa de Oliveira Mota; Sousa, Debora Batista Pinheiro; Dantas, Janaina Gomes; Castro, Jonatas da Silva; Neta, Raimunda Nonata Fortes Carvalho

    2015-12-01

    This study used oxidative stress enzyme (Glutathione S-Transferase and Catalase), histopathological lesions (Branchial lesions) and biometric data in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in an Environmental Protection Area at São Luis, Brazil. Fish were sampled from two locations (A1 = contaminated area and A2 = reference site) within the protected area on four occasions. The activity of catalase (CAT) and glutathione S-transferase (GST) in C. macropomum was compared with biometric data and histopathological lesions. Results have shown that biometric data decreased significantly in fish (p<0.05) at the contaminated site. The activity of CAT was higher in fish specifically caught in A1. A significant difference was observed in the GST activity in the liver of C. macropomum when comparing fish from the contaminated site and those from the reference site (p<0.05).

  19. Aspects of the reproductive biology of Sarpa sa/pa (Pisces: Sparidae ...

    African Journals Online (AJOL)

    fork length, while the adult sex ratio in the shore-based catch was 1 :1.6 in favour of males. Frequency distribu- ... 1978; Lasiak 1983; Whitfield 1989; Whitfield & Kok 1992). In order to obtain a full .... cated at Sea World, Durban. The fish were ...

  20. First record of Rivulus marmoratus Poey, 1880 From the South American continent (Pisces: Cyprinodontidae)

    NARCIS (Netherlands)

    Taphorn, D.C.

    1980-01-01

    Rivulus marmoratus Poey, 1880 has previously been found only in south Florida, Cuba, the Bahamas, Barbuda, St. Martin and several islands off the Venezuelan coast (Curaçao, Bonaire and Gran Roque) (Hoedeman, 1958; Böhlke & Chaplin, 1968). In September of 1978, one of my students, Mr. Edgard W.

  1. A contribution to the data on tench (Tinca tinca L., Cyprinidae, pisces distribution in Serbia

    Directory of Open Access Journals (Sweden)

    Marković Goran S.

    2010-01-01

    Full Text Available The studies on the ichthyofauna of Serbia that have been conducted so far indicate the sporadic tench (Tinca tinca L. presence in typical habitats. The hydroenvironmental conditions necessary for the survival of this fish species are highly variable and, generally, are more favourable in the northern part of the country (the Vojvodina Province. Although the tench presence has been registered at over 30 sites, there is a tendency of a decrease in population abundance. This is due to the reduction of the surface area of the macrophyte-covered flood zones induced by the damming and regulation of rivers, high water level fluctuations, and water amount reduction in the majority of watercourses, a massive increase in the number of allochthonous phytofagous species, reservoir sediment deposition, water quality deterioration and other factors. The tench conservation status in Serbia is officially designated as Low Risk - Least Concern. It may be transferred to a higher category if the tendency towards deterioration of survival conditions for the species should continue.

  2. Deep-water chaunacid and lophiid anglerfishes (Pisces: Lophiiformes) off the south-eastern United States

    Science.gov (United States)

    Caruso, John H.; Ross, Steve W.; Sulak, K.J.; Sedberry, G.R.

    2007-01-01

    Recent research cruises to deep (80-910 m) reef habitats off the south-eastern U.S. and in the northern Gulf of Mexico have provided new information on the diagnostic characteristics, behaviours, colour patterns in life, bottom associations, distributions and maximum sizes of species of the anglerfish genera Chaunax, Lophiodes and Sladenia. Chaunax stigmaeus occurred much further south than previously known (Blake Plateau off South Carolina), and all C. stigmaeus observed were found associated with dense beds of dead coral (Lophelia pertusa) rubble or on broken hard bottom. In contrast, Chaunax suttkusi was found on soft bottoms. Chaunax stigmaeus and C. suttkusi appear to be sympatric over a major portion of their ranges. Because knowledge of pigmentation in live or freshly caught Chaunax is critical to distinguish some members of the genus, changes in the colouration of C. suttkusi were noted and documented photographically immediately after death and after fixation. The yellow spots found on some, but not all specimens, temporarily disappeared completely after death, but they reappeared after fixation, slowly disappearing thereafter along with other carotenoid pigments. Lophiodes beroe and Lophiodes monodi were collected for the first time off the Atlantic coast of the U.S., being previously known only from the Gulf of Mexico, Caribbean Sea and the northern coast of South America. For both species (L. beroe and L. monodi), the collections included the two largest known representatives of the species (400 and 325 mm standard length, respectively). Lophiodes beroe commonly occurred on L. pertusa rubble, and seemed to prefer this habitat. Occupying such a habitat that is deep and difficult to sample probably explains how this common species escaped detection. Only a single L. monodi was collected or observed, so this species appears to be uncommon in this geographic area or at least so on coral rubble habitat. Detailed aspects of the colour patterns of both species were noted. In particular, L. beroe displayed a characteristic pattern of white patches in life that were not apparent after death. The first photographic documentation of the colour pattern in life and of the pharyngeal pigmentation of Lophiodes reticulatus is provided. The third known specimen of Sladenia shaefersi, and the first to be taken in U.S. waters was collected from coral rubble near the base of a steep 200 m scarp on the Blake Plateau. ?? 2007 The Fisheries Society of the British Isles.

  3. Deep-water chaunacid and lophiid anglerfishes (Pisces: Lophiiformes) off the Southeastern United States

    Science.gov (United States)

    Caruso, John H.; Ross, Steve W.; Sulak, Kenneth J.; Sedberry, George R.

    2007-01-01

    Recent research cruises to deep (80–910 m) reef habitats off the south-eastern U.S. and in the northern Gulf of Mexico have provided new information on the diagnostic characteristics, behaviours, colour patterns in life, bottom associations, distributions and maximum sizes of species of the anglerfish genera Chaunax, Lophiodes and Sladenia. Chaunax stigmaeus occurred much further south than previously known (Blake Plateau off South Carolina), and all C. stigmaeusobserved were found associated with dense beds of dead coral (Lophelia pertusa) rubble or on broken hard bottom. In contrast, Chaunax suttkusi was found on soft bottoms. Chaunax stigmaeusand C. suttkusi appear to be sympatric over a major portion of their ranges. Because knowledge of pigmentation in live or freshly caught Chaunax is critical to distinguish some members of the genus, changes in the colouration of C. suttkusi were noted and documented photographically immediately after death and after fixation. The yellow spots found on some, but not all specimens, temporarily disappeared completely after death, but they reappeared after fixation, slowly disappearing thereafter along with other carotenoid pigments. Lophiodes beroe andLophiodes monodi were collected for the first time off the Atlantic coast of the U.S., being previously known only from the Gulf of Mexico, Caribbean Sea and the northern coast of South America. For both species (L. beroe and L. monodi), the collections included the two largest known representatives of the species (400 and 325 mm standard length, respectively). Lophiodes beroecommonly occurred on L. pertusa rubble, and seemed to prefer this habitat. Occupying such a habitat that is deep and difficult to sample probably explains how this common species escaped detection. Only a single L. monodi was collected or observed, so this species appears to be uncommon in this geographic area or at least so on coral rubble habitat. Detailed aspects of the colour patterns of both species were noted. In particular, L. beroe displayed a characteristic pattern of white patches in life that were not apparent after death. The first photographic documentation of the colour pattern in life and of the pharyngeal pigmentation of Lophiodes reticulatus is provided. The third known specimen of Sladenia shaefersi, and the first to be taken in U.S. waters was collected from coral rubble near the base of a steep 200 m scarp on the Blake Plateau.

  4. Male sexual polymorphism, alternative reproductive tactics, and androgens in combtooth blennies (pisces: blenniidae).

    Science.gov (United States)

    Oliveira, R F; Canario, A V; Grober, M S

    2001-09-01

    In species in which intense intermale competition for the access to females is present males of lower competitive ability may adopt alternative reproductive tactics (ART) to get access to mates. These ART translate in many cases into male sexual polymorphism, with individuals following distinctly different tactics. Usually two alternative male morphs can be recognized in species with ART: (1) bourgeois males that compete for access to mates invest in typically male behaviors, such as building elaborated nests or displaying ornaments; and (2) parasitic males that take advantage of the success of the bourgeois males in attracting females and attempt "sneaker" fertilizations (e.g., sneaker and satellite males). In combtooth blennies (Blenniidae) the co-occurrence of ART and male sexual polymorphism has been described for two temperate species: the peacock blenny, Salaria pavo, and the Azorean rock-pool blenny, Parablennius sanguinolentus parvicornis. Interestingly, while in the peacock blenny the alternative male morph adopts a sneaker tactic, in the rock-pool blenny parasitic males act as satellites to nest-holder males. Thus, this variation in the ART expressed in these two closely related species allows for a comparative study of the proximate and ultimate factors affecting the expression of the two ART. In this article we summarize the available information on androgen levels in bourgeois and parasitic males of natural populations of the two species and of recent studies on the effect of exogenous administration of androgens on tactic switching in parasitic males of the two species. The information is discussed within the frame of the relative plasticity hypothesis, which predicts that plastic alternative morphs should show differences in hormone levels and that the administration of sex steroids should be effective in promoting the switch from the parasitic to bourgeois tactic. The evidence is only partly consistent with this hypothesis. Alternatively, a social transduction hypothesis that better fits the available data on androgens and ART in teleost is proposed. It states that the observed differences in androgen levels between alternative morphs should not be interpreted as an organization vs activation effect of steroids, but rather as the limited vs lifelong responsiveness of the neuroendocrine axis to social regulation. Copyright 2001 Academic Press.

  5. Otoliths of the wolf-fishes (genus Anarrhichas Linnaeus, 1758) from the Northern Atlantic (Pisces, Perciformes)

    NARCIS (Netherlands)

    Nijssen, H.

    1964-01-01

    While working at the Rijksinstituut voor Visserijonderzoek (R.V.I.O.) at IJmuiden, I received through the courtesy of Mr. C. van Delft some specimens of the three northern Atlantic species of wolf-fishes. At IJmuiden they are brought in by commercial trawlers. The only data in the literature known

  6. The South American Mailed Catfishes of the genus Pseudoloricaria Bleeker, 1862 (Pisces, Siluriformes, Loricariidae)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1976-01-01

    Two species of South American Mailed Catfishes of the genus Pseudoloricaria Bleeker, 1862 are redescribed and figured from type-specimens and additional material: Pseudoloricaria laeviuscula (Valenciennes, 1840), and Pseudoloricaria punctata (Regan, 1904). Since the provenance of the holotype of P.

  7. Three new South American mailed catfishes of the genera Rineloricaria and Loricariichthys (Pisces, Siluriformes, Loricariide)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1979-01-01

    Three new species belonging to two different genera of South American mailed catfishes of the subfamily Loricariinae are described and figured. A discussion of and comparative notes on related species are added. Rineloricaria formosa n. sp. is described from the Río Inírida/Río Orinoco drainage in

  8. Intense predation on ascidians by a trunk fish, Ostracion immaculatus (Temminck et Schlege) (Pisces:Ostracidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Raveendran, T.V.; Harada, E.

    stream_size 9 stream_content_type text/plain stream_name Publ_Seto_Mar_Biol_Lab_37_193.pdf.txt stream_source_info Publ_Seto_Mar_Biol_Lab_37_193.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  9. Biogeographic patterns in the cartilaginous fauna (Pisces: Elasmobranchii and Holocephali in the southeast Pacific Ocean

    Directory of Open Access Journals (Sweden)

    Carlos Bustamante

    2014-05-01

    Full Text Available The abundance and species richness of the cartilaginous fish community of the continental shelf and slope off central Chile is described, based on fishery-independent trawl tows made in 2006 and 2007. A total of 194,705 specimens comprising 20 species (9 sharks, 10 skates, 1 chimaera were caught at depths of 100–500 m along a 1,000 km transect between 29.5°S and 39°S. Sample site locations were grouped to represent eight geographical zones within this latitudinal range. Species richness fluctuated from 1 to 6 species per zone. There was no significant latitudinal trend for sharks, but skates showed an increased species richness with latitude. Standardised catch per unit effort (CPUE increased with increasing depth for sharks, but not for skates, but the observed trend for increasing CPUE with latitude was not significant for either sharks or skates. A change in community composition occurred along the depth gradient with the skates, Psammobatis rudis, Zearaja chilensis and Dipturus trachyderma dominating communities between 100 and 300 m, but small-sized, deep-water dogfishes, such as Centroscyllium spp. dominated the catch between 300 and 500 m. Cluster and ordination analysis identified one widespread assemblage, grouping 58% of sites, and three shallow-water assemblages. Assemblages with low diversity (coldspots coincided with highly productive fishing grounds for demersal crustaceans and bony fishes. The community distribution suggested that the differences between assemblages may be due to compensatory changes in mesopredator species abundance, as a consequence of continuous and unselective species removal. Distribution patterns and the quantitative assessment of sharks, skates and chimaeras presented here complement extant biogeographic knowledge and further the understanding of deep-water ecosystem dynamics in relation to fishing activity in the south-east Pacific Ocean.

  10. Estructura espacial de Eucinostomus argenteus (Pisces: Gerreidae en la zona norte del Caribe colombiano

    Directory of Open Access Journals (Sweden)

    Jorge Paramo

    2010-01-01

    Full Text Available Esta investigación se llevó a cabo para determinar la distribución espacial de la densidad (captura por unidad de área – CPUA y de la estructura de tallas de Eucinostomus argenteus y su relación con las variables ambientales en la zona norte del Caribe colombiano. Los datos fueron se tomaron durante un crucero de investigación realizado en  la época seca (febrero de 2006 entre  Puerto Estrella (La Guajira y Santa Marta (Magdalena. Las muestras biológicas se colectaron con una red de arrastre (en estratos de profundidad < 50 m y 50-100 m siguiendo un diseño de muestreo sistemático. Los individuos maduros y de tallas mayores se encontraron distribuidos principalmente entre Manaure y Punta Gallinas, donde la plataforma continental es muy ancha y la oceanografía local esta modulada por la surgencia estacional. Los peces juveniles, se distribuyeron al sur del área de estudio, entre Boca Camarones y el Río Buritaca, cerca de la costa. En este sector la plataforma es muy estrecha y con alta productividad biológica por la presencia de ríos, manglares y pastos marinos, sirviendo como zona de alimentación y refugio para E. argenteus. En general los resultados sugieren que las variables ambientales son importantes para la distribución espacial de la abundancia y las tallas de  E. argenteus en la zona norte del Caribe colombiano, siendo la temperatura y la profundidad las variables que predijeron mejor la distribución espacial de la especie.

  11. Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878 (Pisces: Cichlidae exposed to different temperatures and salinities

    Directory of Open Access Journals (Sweden)

    M.I. Segnini de Bravo

    2001-03-01

    Full Text Available Tropical river sardine, Caquetaia kraussii, captured from La Aguá lagoon (Sucre State, Venezuela were acclimatized for four weeks at 22, 24, 30 and 32ºC and at 0, 5, 10, 15 and 17 ‰ salinity. To evaluate effects of thermal response to acclimatization level, the fish were transferred suddenly from lower temperatures (22 and 24ºC to higher ones (32 and 30ºC respectively. Then thermal resistance time was measured at the lethal temperature of 40.9ºC for 30 days. We considered that acclimatization process completed when resistance time was stabilized at the new temperature regime. For the saline effect, the concentrations of sodium and potassium were measured in the tissues at each treatment: gills, white muscle, gut and heart. The results showed that thermal tolerance increased rapidly in 3 h with a 6ºC rise in temperature (from 24 to 30ºC and in 24 h with a 10ºC rise (22 to 32ºC. With decreasing temperatures, the acclimatization level reached its lowest in 11 days with a 6ºC decreases (from 30 to 24ºC and in 14 days with a 10ºC decrease (32 to 22ºC. Caquetaia kraussii regulates as much sodium as potassium in gills and white muscle tissues at all salinity levels tested; however, gut and heart tissues showed significantly different regulations among salinities examined.La sardina tropical de río, Caquetaia kraussii, capturada en la laguna La Aguá (Estado Sucre, Venezuela fue aclimatada durante cuatro semanas a la temperatura de 22, 24, 30 y 32ºC y a 0, 5, 10, 15 y 17 ‰ de salinidad. Para evaluar los efectos de respuestas térmicas a los niveles de aclimatación, los peces fueron transferidos abruptamente desde las temperaturas bajas (22 y 24ºC hasta las altas (32 y 30ºC respectivamente. Se midió entonces la resistencia térmica a la temperatura letal de 40.9ºC durante 30 días. Se consideró que los peces habían alcanzado completamente su aclimatación cuando se estabilizaba al nuevo régimen de temperatura. Para el efecto salino, las concentraciones de sodio y potasio fueron determinadas en los tejidos: branquial, muscular, gástrico y cardíaco. Los resultados mostraron que la tolerancia térmica aumentaba rápidamente en 3 h cuando la diferencia de temperatura era de 6ºC (24 a 30ºC y en 24 h cuando la diferencia era de 10ºC (22 a 32ºC. En los descensos de temperaturas, el nivel de aclimatación se alcanzó a los 11 días cuando el intercambio se hizo desde 30 a 24ºC y en 14 días con un descenso de 10ºC (32 a 22ºC. Los resultados indican que Caquetaia kraussii regula tanto sodio como potasio a nivel muscular y branquial a todos los niveles de salinidad estudiados; sin embargo a nivel gástrico y cardíaco se observaron regulaciones significativamente diferentes entre las salinidades examinadas.

  12. Morphology and cytology of the olfactory organs in small juvenile Dascyllus aruanus and Amphiprion ocellaris (Pisces

    DEFF Research Database (Denmark)

    Arvedlund, Michael; Brolund, Thea Marie; Nielsen, Lis Engdahl

    2003-01-01

    The olfactory organs in juvenile Dascyllus aruanus and Amphiprion ocellaris, studied by scanning and transmission electron microscopy (SEM and TEM), consisted of two bilaterally radial rosettes per specimen, fan-shaped, located medio-ventrally, one in each of two olfactory chambers. In D. aruanus...

  13. Obtención de secuencias microsatelitales especie especificas para Plagioscion magdalenae (Pisces:Sciaenidae

    Directory of Open Access Journals (Sweden)

    Natalia Juliana Bayona-Vásquez

    2007-08-01

    en la parte baja de la cuenca del río Magdalena y en la cuenca del río San Jorge, Colombia, en donde cada vez su comercialización cobra fuerza debido al desplazamiento y disminución en los volúmenes de captura de otras especies como el bagre rayado y bocachico. Lo cual ha llevado a la comúnmente llamada pacora a catalogarse en estado de vulnerabilidad en las cuencas colombianas. Lo anterior, hace necesario la generación de información que sirva de sustento a programas de conservación y uso sostenible de la especie. Una primera aproximación a las poblaciones de P. magdalenae puede ser hecha a través de marcadores moleculares microsatelitales, útiles en trabajos de genética de poblaciones, conservación y manejo de recursos biológicos. Sin embargo, la principal dificultad de los microsatélites es que deben ser aislados de novo para aquellas especies que van a ser evaluadas por primera vez, lo que lleva a la necesidad de obtener primers para la especie. En este trabajo, inicialmente se obtuvo un ADN de buena calidad útil para amplificaciones a partir de muestras de músculo colectadas en cuatro puntos de la cuenca del río San Jorge; posteriormente, se aislaron primers microsatelitales especie-específicos para P. magdalenae mediante amplificación cruzada con primers de otras especies de peces lejanas, entre las cuales se encuentra: Pseudoplatystoma corruscans, Pimelodella chagressi, Prochilodus argenteus y Prochilodus costatus. Para lo anterior, fue necesario modificar y estandarizar protocolos de amplificación mediante cambios en temperatura de alineamiento y concentración de reactivos; y por último se realizó el secuenciamiento de regiones flanqueantes y motivos de repetición en aquellos sistemas que presentaron resultados positivos, de esta forma, se diseñaron primers de regiones microsatélite para la especie. De los trece sistemas evaluados, de las cuatro especies, se obtuvo amplificación positiva de seis. Por medio de la técnica expuesta es posible aislar de manera económica y eficiente (cerca de un 50% de resultados efectivos, regiones microsatelitales útiles para estudios posteriores en peces.

  14. Otoliths analysis of Mugil curema (Pisces: Mugilidae in Cuyutlan Lagoon, Mexico

    Directory of Open Access Journals (Sweden)

    E. Espino-Barr

    2013-01-01

    Full Text Available Se analizaron la morfología, la morfometría y los anillos de crecimiento de los otolitos: sagitta, asteriscus y lapillus de la lebrancha o liseta Mugil curema de la Laguna de Cuyutlán, Colima, México; asimismo, se analizaron las diferencias entre derecho e izquierdo y entre sexos. Los ejemplares fueron obtenidos de la captura comercial en los meses de agosto a octubre de 2007, agosto de 2008 y julio de 2011. En todos los casos se observó que el crecimiento de los otolitos es excéntrico con respecto al núcleo. Las relaciones entre la longitud total del pez y la longitud y ancho de los otolitos demostraron que esta estructura puede usarse para describir el crecimiento del pez. Se identificaron seis anillos de crecimiento en las sagittae y asterisci: especímenes con dos anillos midieron 21.80 cm de longitud total (TL (± 1.41 desviación estándar, los de tres anillos 22.90 (± 0.91, con cuatro anillos midieron 25.30 (± 0.39, con cinco anillos 28.30 (± 0.78 y con seis anillos 31.10 cm (± 2.22. En los lapilli, debido a su gran grosor, no fue posible observar marcas de crecimiento. Durante la etapa inmadura, los otolitos de las hembras son de mayor tamaño, pero una vez que alcanzan la madurez sexual, los otolitos de los machos alcanzan longitudes mayores.

  15. ESTIMACIÓN DEL RENDIMIENTO Y VALOR NUTRICIONAL DEL BESOTE Joturus pichardi Poey, 1860 (Pisces: Mugilidae

    Directory of Open Access Journals (Sweden)

    Pedro Eslava E

    2009-04-01

    Full Text Available Objetivo. Evaluar el rendimiento eviscerado y en filete del besote (Joturus pichardi, así como la calidad nutricional y el grado de aceptación de su carne. Materiales y métodos. Se estimó el rendimiento eviscerado y en filete de 20 peces, capturados en diferentes ríos del norte de la Sierra Nevada de Santa Marta (SNSM. La longitud y el peso promedio de los peces analizados fue de 445.3 mm y 1130.7 g, respectivamente. El valor alimenticio se realizó mediante un análisis proximal. El grado de aceptación de la carne se evaluó mediante el test hedónico, encuestando a 20 personas. Resultados. Los rendimientos del pez eviscerado y en filete fueron de 92.8% y 49.5%, respectivamente. El análisis proximal indicó las siguientes contenidos: proteína 21.50%; grasa 5.30%; cenizas 1.40%; y humedad 71.70%. Esos valores indicaron un alto contenido de valor calórico (135.30 Kcal/100 g, valor proteico (15.90 g/100 Cal y valor nutritivo (0.619/100 g del filete. Conclusiones. Al comparar los resultados con otros estudios, el Besote demuestra tener un alto rendimiento en el filete y un excelente valor alimenticio de su carne que lo sugieren como un pez promisorio para la acuicultura de Centro América y el Gran Caribe.

  16. Gamma ionization of Phagicola longa (Trematoda:Heterophyidae) in Mugilidae (pisces) in Sao Paulo, Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, S.A.; Wiendl, F.M.; Almeida Dias, E.R.; Arthur, V.; Daniotti, C. (Sao Paulo Univ., SP (Brazil))

    The mullet (Mugilidae) is a fish caught in large quantities in brackish and marine waters of the southern Brazilian coast, which in consequence of its raw consumption as ''sashimi'', a typical Japanese dish, has led to ten cases of human infection by Phagicola longa in Sao Paulo, Brazil. The mullet acts as a second intermediate host for the parasite, as in human heterophyiasis in the Near and Far East. In order to control these infections under commercial storage conditions and in raw consumption, the radiolysis of P. longa was studied in three mullet species - the silver mullet (Mugil curema), the grey mullet (M. platanus) and the ''paratipema'' (Mugil sp.) -subjected to ionization ranging from 1.0 to 10.0 kGy (2.21 kGy/h). It was observed that 1.0 and 2.0 kGy caused a motility decrease in silver mullet parasites from 100% to 15% and 17%, and that doses of 4.0 and 10.0 kGy caused metacercaria inviability. The parasite motility decreased in the grey mullet treated with doses of 2.0, 2.5, 3.0 and 3.5 kGy, from 56% to 31%, 9%, 18% and 5%, respectively, 4.0 kGy tending to be the control dose for P. Longa. This dose also controls other metacercaria found in the ''parati-pema'', without changing the odor, color or appearance of the treated mullet. (author).

  17. Gamma ionization of Phagicola longa (Trematoda:Heterophyidae) in Mugilidae (pisces) in Sao Paulo, Brazil

    International Nuclear Information System (INIS)

    Antunes, S.A.; Wiendl, F.M.; Almeida Dias, E.R.; Arthur, V.; Daniotti, C.

    1993-01-01

    The mullet (Mugilidae) is a fish caught in large quantities in brackish and marine waters of the southern Brazilian coast, which in consequence of its raw consumption as ''sashimi'', a typical Japanese dish, has led to ten cases of human infection by Phagicola longa in Sao Paulo, Brazil. The mullet acts as a second intermediate host for the parasite, as in human heterophyiasis in the Near and Far East. In order to control these infections under commercial storage conditions and in raw consumption, the radiolysis of P. longa was studied in three mullet species - the silver mullet (Mugil curema), the grey mullet (M. platanus) and the ''paratipema'' (Mugil sp.) -subjected to ionization ranging from 1.0 to 10.0 kGy (2.21 kGy/h). It was observed that 1.0 and 2.0 kGy caused a motility decrease in silver mullet parasites from 100% to 15% and 17%, and that doses of 4.0 and 10.0 kGy caused metacercaria inviability. The parasite motility decreased in the grey mullet treated with doses of 2.0, 2.5, 3.0 and 3.5 kGy, from 56% to 31%, 9%, 18% and 5%, respectively, 4.0 kGy tending to be the control dose for P. Longa. This dose also controls other metacercaria found in the ''parati-pema'', without changing the odor, color or appearance of the treated mullet. (author)

  18. Analysis of mitochondrial DNA: taxonomic and phylogenetic relationships in two fish taxa (Pisces: Mugilidae and Cyprinidae).

    Science.gov (United States)

    Semina, A V; Polyakova, N E; Brykov, Vl A

    2007-12-01

    To solve some systematic questions as well as to study genetic variability and evolutionary relationships in two groups of fish belonging to the Mugilid (Mugilidae) and Cyprinid (Cyprinidae) families, we have used restriction fragment length polymorphism analysis of mitochondrial DNA (mtDNA) fragments amplified in polymerase chain reaction. The analysis of three mtDNA fragments of 7220 bp total length of six Mugilid species has shown that Mediterranean Liza aurata, L. ramada, L. saliens, and Chelon labrosus form a common cluster, L. aurata and C. labrosus being the closest relatives, whereas L. haematocheilus (syn. C. haematocheilus) of the Sea of Japan forms a sister group to the Mediterranean cluster. It was found that Chelon and Liza genera are paraphyletic, and therefore their division into two genera is unnatural and they should be synonymized. According to priority, Liza species should be ascribed to Chelon genus. Mugil cephalus is the most distant compared to the rest of the species studied. The level of genetic divergence between allopatric samples of M. cephalus from the Sea of Japan and the Mediterranean Sea has proved to be very high--4.5% of nucleotide substitutions. The analysis of four mtDNA fragments of 9340 bp total length of six Cyprinid species has shown that L. waleckii is the most genetically distant. Pseudaspius leptocephalus is a sister group to Tribolodon species. All Tribolodon species form a common cluster with T. sachalinensis as a root. The remaining species form two branches, one of which includes T. nakamurai and T. brandtii, another one combines T. hakonensis and a new form of Tribolodon revealed that is close to T. hakonensis by its mtDNA (2.4% of nucleotide substitutions). This new form might be an independent species.

  19. Relative profile analysis of molecular markers for identification and genetic discrimination of loaches (Pisces, Nemacheilidae).

    Science.gov (United States)

    Patil, Tejas Suresh; Tamboli, Asif Shabodin; Patil, Swapnil Mahadeo; Bhosale, Amrut Ravindra; Govindwar, Sanjay Prabhu; Muley, Dipak Vishwanathrao

    2016-01-01

    Genus Nemacheilus, Nemachilichthys and Schistura belong to the family Nemacheilidae of the order Cypriniformes. The present investigation was undertaken to observe genetic diversity, phylogenetic relationship and to develop a molecular-based tool for taxonomic identification. For this purpose, four different types of molecular markers were utilized in which 29 random amplified polymorphic DNA (RAPD), 25 inter-simple sequence repeat (ISSR) markers, and 10 amplified fragment length polymorphism (AFLP) marker sets were screened and mitochondrial COI gene was sequenced. This study added COI barcodes for the identification of Nemacheilus anguilla, Nemachilichthys rueppelli and Schistura denisoni. RAPD showed higher polymorphism (100%) than the ISSR (93.75-100%) and AFLP (93.86-98.96%). The polymorphic information content (PIC), heterozygosity, multiplex ratio, and gene diversity was observed highest for AFLP primers, whereas the major allele frequency was observed higher for RAPD (0.5556) and lowest for AFLP (0.1667). The COI region of all individuals was successfully amplified and sequenced, which gave a 100% species resolution. Copyright © 2016 Académie des sciences. Published by Elsevier SAS. All rights reserved.

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

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    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.

  1. (Pisces, Cichlidae) dans la forêt des marais Tanoé-Ehy

    African Journals Online (AJOL)

    SARAH

    Boigny, 22 BP 582 Abidjan 22, Côte d'Ivoire. (2) Laboratoire de Biologie et de Cytologie Animale, UFR-Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801. Abidjan 02, Côte d'Ivoire. (3) Centre Suisse de ...

  2. Reproductive biology of Liso Rhamdia quelen (pisces: heptapteridae) in the Sinu River, Colombia

    International Nuclear Information System (INIS)

    Olaya Nieto, Charles W; Hernandez Rosso, David F; Ayarza Perez, Edgar

    2010-01-01

    The reproductive biology of Liso (Rhamdia quelen) in the Sinu River was studied. The fishes were collected between January and December 2005, with lengths ranging 15,5 - 37 cm of total length (TL) and 28 - 486 g of total weight. the gonads were placed in Gilson solution, the Vazzoler scale was applicated and sexual proportion, sexual maturity index, spawning season, the length at first maturity, ovocites diameter and fecundity were estimated; 207 females, 130 males and 1 undifferentiated were evaluated, with sexual proportion female: male of 1,6:1, different from expected. The length at first maturity was estimated in 24 cm TL for combined sexes; average ovocites diameter was 963 mm and average fecundity was estimated in 26.305 ovocites, with better equation f=2960,61 0,88, r=0,94, n=125. The Liso is a fish with asynchronous oocyte development in more than two groups, with partial spawning throughout the year.

  3. Crecimiento de Istiophorus platypterus (Pisces: Istiophoridae en la boca del Golfo de California

    Directory of Open Access Journals (Sweden)

    Reyna Alvarado-Castillo

    1998-03-01

    Full Text Available Specimens (733 of Istiohporus platypterus caught by sport fishing in the southern of the California Gulf were measured. The fourth spine of the dorsal fin was collected to estimate the age and individuals from 1 to 8 years were found. The majority of the specimens were between 180 and 210 cm in lower jaw-fork length. The Bertalanffy growth ecuation estimated using length was: Lt=203.6[-e-08(t+0.0015]. Growth was shown to very fast in the early years.

  4. Fecundity, survival, and growth of the seahorse Hippocampus ingens (Pisces: Syngnathidae under semi-controlled conditions

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    A.A Ortega-Salas

    2006-12-01

    Full Text Available Estudiamos la fecundidad, supervivencia, y crecimiento del caballito de mar, Hippocampus ingens en condiciones semi-controladas. Tres machos reproductores silvestres de 14.8, 24.5 y 32.0 g produjeron 1 598, 1 703 y 1 658 jóvenes. La densidad utilizada fue de 12 jóvenes por acuario de 60 l. Se agruparon en 1, 12 y 20 días de nacidos por acuario. La supervivencia fue de 78.5, 38.1 y 41.0 % en 35 días. Se les alimentó con una mezcla de rotíferos B. plicatilis y nauplios de Artemia para después transferirlos a estanques de 100 000 l a una densidad de 50/1 000 l, donde se les alimentó con Artemia adulta durante 60 días más. Crecieron de un promedio de 0.7, 1.5, y 2.7 a 4.5, 5.4 6.7 cm, respectivamente, en 95 días. La temperatura del agua marina utilizada varió de 17 a 23 ºC.We studied fecundity, survival, and growth of the seahorse Hippocampus ingens under semi-controlled conditions. Three wild brood stock mature males of 14.8, 24.5, and 32.0 g released 1 598, 1 703, and 1 658 juveniles. Juvenile stocking densities of 12 were settled in 60-l aquariums in groups of 1, 12, and 20 days old organisms. The rate of survival was 21.5, 61.9, and 59.0 %, respectively, in 35 days. Juveniles were fed a mix diet of rotifers B. plicatilis and Artemia nauplii, then they were transferred to a cement tank of 100 000 l at a density of 50/1 000 l and fed with live adult Artemia for 60 days more. They grew from an average of 0.7, 1.5, and 2.7 to 4.5, 5.4, and 6.7 cm, respectively, in 95 days. The seawater temperature varied from 17 to 23 ºC. Rev. Biol. Trop. 54 (4: 1099-1102. Epub 2006 Dec. 15.

  5. Fecundity, survival, and growth of the seahorse Hippocampus ingens (Pisces: Syngnathidae under semi-controlled conditions

    Directory of Open Access Journals (Sweden)

    A.A Ortega-Salas

    2006-12-01

    Full Text Available Estudiamos la fecundidad, supervivencia, y crecimiento del caballito de mar, Hippocampus ingens en condiciones semi-controladas. Tres machos reproductores silvestres de 14.8, 24.5 y 32.0 g produjeron 1 598, 1 703 y 1 658 jóvenes. La densidad utilizada fue de 12 jóvenes por acuario de 60 l. Se agruparon en 1, 12 y 20 días de nacidos por acuario. La supervivencia fue de 78.5, 38.1 y 41.0 % en 35 días. Se les alimentó con una mezcla de rotíferos B. plicatilis y nauplios de Artemia para después transferirlos a estanques de 100 000 l a una densidad de 50/1 000 l, donde se les alimentó con Artemia adulta durante 60 días más. Crecieron de un promedio de 0.7, 1.5, y 2.7 a 4.5, 5.4 6.7 cm, respectivamente, en 95 días. La temperatura del agua marina utilizada varió de 17 a 23 ºC.

  6. Spawning seasons of Rasbora tawarensis (Pisces: Cyprinidae in Lake Laut Tawar, Aceh Province, Indonesia

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    Musman Musri

    2010-05-01

    Full Text Available Abstract Background Rasbora tawarensis is an endemic freshwater fish in Lake Laut Tawar, Aceh Province, Indonesia. Unfortunately, its status is regarded as critical endangered with populations decreasing in recent years. To date no information on the spawning activities of the fish are available. Therefore, this study provides a contribution to the knowledge on reproductive biology of R. tawarensis especially on spawning seasons as well as basic information for conservation of the species. Methods Monthly sampling was conducted from April 2008 to March 2009 by using selective gillnets. The gonadosomatic index, size composition and sex ratio were assessed. The gonadal development was evaluated based on macroscopic and microscopic examinations of the gonads. Results The gonadosomatic index (GSI varied between 6.65 to 18.16 in female and 4.94 to 8.56 for male. GSI of the female R. tawarensis was higher in March, September and December indicating the onset of reproductive seasons, the GSI and oocyte size being directly correlated with gonadal development stages. Although, a greater proportion of mature male than female was detected during the study, the sex ratio showed that the overall number of female was higher than male. The ovaries had multiple oocyte size classes at every stage of gonadal development, thus R. tawarensis can be classified as a group synchronous spawner or a fractional multiple spawner. Conclusion The spawning seasons of R. tawarensis were three times a year and September being the peak of the reproductive season and the female was the predominant sex. This species is classified as a group synchronous spawner.

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

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    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.

  8. Comparative cytogenetic studies of Curimatidae (Pisces, Characiformes) from the middle Paraná River (Argentina).

    Science.gov (United States)

    Brassesco, M S; Pastori, M C; Roncati, H A; Fenocchio, A S

    2004-06-30

    Almost all species of the Curimatidae family have a stable karyotype, with a diploid number of 54 metacentric (M) and submetacentric (SM) chromosomes, and one sole nucleolus organizer pair. This family has considerable specific diversity in Argentinean fluvial basins; however, no cytogenetic data are available. Eight species from the Paraná River (Argentina): Cyphocharax voga, C. spilotus, C. platanus, Steindachnerina brevipinna, S. conspersa, Curimatella dorsalis, Psectrogaster curviventris, and Potamorhina squamoralevis were analyzed cytogenetically. Chromosome preparations were obtained from direct samples and through cell culture, and they were processed for conventional, C- and nucleolar organizer region-banding. Six of the species exhibited the standard family karyotype, with 2n = 54 M-SM and fundamental number of chromosomes (FN) = 108, as well as variations in the chromosome formula, and in heterochromatic and nucleolar organizer regions. Though nucleolar organizer regions were located on only one chromosome pair, they varied in both carrier chromosomes and pairs involved. On the other hand, C. platanus showed a complement of 2n = 58 M-SM and subtelocentric with FN = 116, and P. squamoralevis presented 2n = 102, with some M-SM and a large number of acrocentric chromosomes. Even though the karyotype macrostructure appears to be conserved, the speciation process within the family has been accompanied by micro-structural rearrangements, as evidenced by pattern diversity in the heterochromatin and nucleolar organizer regions. Some changes in chromosome macrostructure have also occurred in this group, primarily in C. platanus and P. squamoralevis, in which there have been centric dissociations and inversions.

  9. Reproduction, distribution and abundance of Bothus constellatus (Pisces: Bothidae, in the Gulf of Tehuantepec, Mexico

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    M. Tapia-García

    2000-03-01

    Full Text Available A total of 3 593 individuals of Bothus constellatus was captured during five oceanographic cruises carried out in the Gulf of Tehuantepec, Mexico. Its distribution, abundance, and reproduction patterns were stated by means of the analysis of the population parameters (i.e. density, biomass, weight and size average, visceral and gonadosomatic index, and maturity stages. B. constellatus is a typical demersal marine species, because it does not occur in estuaries, but occurs near to them on the continental shelf. It is distributed in the Gulf of Tehuantepec in depths lesser than 60 m, with high abundance around the 40 m isobath, and in front of Mar Muerto Lagoon. During January and May the biomass and density were high. The size at first maturity of females is 101 mm total length, and maturation occurs first in zones influenced by estuarine processes. Reproduction and recruitment were detected in all the collections.

  10. 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...... otophysans could have originated before the splitting of the Pangean supercontinent is of extreme importance, since otophysan fishes are among the most useful animal groups for the determination of historical continental relationships. In the present work we examined divergence times for each major...... otocephalan group by an analysis of complete mtDNA sequences, in order to investigate if these divergence times support the hypotheses advanced in recent studies. The complete mtDNA sequences of nine representative non-otocephalan fish species and of twenty-one representative otocephalan species was compared...

  11. Trophic polymorphism, habitat and diet segregation in Percichthys trucha (Pisces : Percichthyidae) in the Andes

    DEFF Research Database (Denmark)

    Ruzzante, D.E.; Walde, S.J.; Cussac, V.E.

    1998-01-01

    Divergent natural selection affecting specific trait combinations that lead to greater efficiency in resource exploitation is believed to be a major mechanism leading to trophic polymorphism and adaptive radiation. We present evidence of trophic polymorphism involving two benthic morphs within...... Percichthys trucha, a fish endemic to temperate South America. In a series of lakes located in the southern Andes, we found two morphs of P. trucha that could be distinguished on the basis of gill raker length and five other morphological measures, most of which are likely associated with the use of food...

  12. Feeding of the megamouth shark (Pisces: Lamniformes: Megachasmidae) predicted by its hyoid arch: a biomechanical approach.

    Science.gov (United States)

    Tomita, Taketeru; Sato, Keiichi; Suda, Kenta; Kawauchi, Junro; Nakaya, Kazuhiro

    2011-05-01

    Studies of the megamouth shark, one of three planktivorous sharks, can provide information about their evolutionary history. Megamouth shark feeding has never been observed in life animals, but two alternative hypotheses on biomechanics suggest either feeding, i.e., ram feeding or suction feeding. In this study, the second moment of area of the ceratohyal cartilages, which is an indicator of the flexural stiffness of the cartilages, is calculated for 21 species of ram- and suction-feeding sharks using computed tomography. The results indicate that suction-feeding sharks have ceratohyal cartilages with a larger second moment of area than ram-feeding sharks. The result also indicates that the ram-suction index, which is an indicator of relative contribution of ram and suction behavior, is also correlated with the second moment of area of the ceratohyal. Considering that large bending stresses are expected to be applied to the ceratohyal cartilage during suction, the larger second moment of area of the ceratohyal of suction-feeding sharks can be interpreted as an adaptation for suction feeding. Based on the small second moment of area of the ceratohyal cartilage of the megamouth shark, the feeding mode of the megamouth shark is considered to be ram feeding, similar to the planktivorous basking shark. From these results, an evolutionary scenario of feeding mechanics of three species of planktivorous sharks can be suggested. In this scenario, the planktivorous whale shark evolved ram feeding from a benthic suction-feeding ancestor. Ram feeding in the planktivorous megamouth shark and the basking shark evolved from ram feeding swimming-type ancestors and that both developed their unique filtering system to capture small-sized prey. Copyright © 2011 Wiley-Liss, Inc.

  13. Two new species of Nomimoscolex (Cestoda: Proteocephalidea, Monticelliidae from Gymnotus carapo (Pisces: Gymnotiformes in Argentina

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    Pertierra Alicia A Gil de

    2003-01-01

    Full Text Available Nomimoscolex guillermoi n. sp. and N. dechambrieri n. sp. are described from the gymnotiform fish Gymnotus carapo from Argentina. The new species are placed into Nomimoscolex based on the cortical position of the vitelline follicles, and medullary position of the testes, ovary, and uterus. Both species were compared to the 13 species considered valid in the genus. The combination of features distinguishing N. guillermoi from N. dechambrieri is (1 the position of the vagina to cirrus pouch (anterior or posterior vs always anterior respectively, (2 the total number of testes (41-85 vs 108-130 respectively, (3 the distribution of the vitelline follicles (arranged in dorso-lateral and ventro-lateral bands vs lateral bands respectively, (4 the length of the uteroduct (ending 58% vs 35% from posterior margin of mature proglottis respectively, and (5 the presence of gland cells in the scolex (unicellular glands in the apical region and the external margin of suckers vs the presence of unicellular glands in the apex and other grouped in a cluster medially to the suckers respectively.

  14. Cariotipo y regiones organizadoras del nucleolo del pez sapo marino Halobatrachus didactylus (Schneider, 1801) (Pisces: Batrachoididae)

    OpenAIRE

    Palazón, J. L.; Nirchio, M.; Sarasquete, C.

    2003-01-01

    Se estudió el cariotipo convencional (Giemsa) y las Regiones Organizadoras del Nucleolo (NOR) en el pez sapo marino Halobatrachus didactylus. El número diploide de cromosomas 2n = 46 estuvo compuesto de 8 elementos metacéntricos, 12 submetacéntricos y 26 acrocéntricos (NF = 66). No fueron observados cromosomas sexuales heteromórficos en esta especie. Los cromosomas metacéntricos fueron fácilmente clasificados como pares homólogos según su morfología y la relación longitud del brazo largo/long...

  15. Morphological heterogeneity and population differentiation in the green chromid Etroplus suratensis (Pisces: Cichlidae in Sri Lanka

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    K. B. Suneetha Gunawickrama

    2007-09-01

    Full Text Available Morphological variation of the euryhaline cichlid fish Etroplus suratensis (Bloch from six geographically apart estuarine localities along the southern and western coasts of Sri Lanka was studied. Significant heterogeneity in morphology of the cichlid were found with respect to nine morphometric characters (n=218. Fish of Nilwala estuary and Garanduwa lagoon were not significantly different in morphology, yet they show discernible differences from the other four samples (Kahanda lagoon, Chilaw lagoon, Walawe estuary and Koggala lagoon with respect to the most of the studied characters. Concordant results were found by multivariate analysis of the sizecorrected morphological data as well. Three functions were significant in discriminating the populations of which the first two functions accounted for 95% of the covariance (CV1 85.4 % and CV2 9.7%. The function with the greatest discriminatory power (CV1 can clearly separate samples of Nilwala estuary (L5 and Garanduwa lagoon (L6 from the rest of the samples, while the magnitude of the discrimination between the latter samples is much smaller. Classification functions could correctly classify an average of 65.7% of the individuals into their respective a priori population units. No evidence was found for isolation-by-distance model. The results suggest that E. suratensis populations in some of the studied estuarine localities maintain significant morphological heterogeneity, and the morphological variation can be used to differentiate some of these populations.

  16. Larval development of hoplias cf. Lacerdae (Pisces: Erythrinidae and delayed initial feeding effects

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    Rodolfo N. Sirol

    1998-06-01

    Full Text Available Larval development of Hoplias cf. lacerdae was studied under laboratory conditions. After hatching, ontogenetic changes were recorded on food-deprived larvae in 12-hour intervals. Mouth opening occurred after 2.5 days and notochord terminated flexure in 6.5 days. Notochord length increased at a constant rate until complete yolk absorption (13,5 days. Larval dry weight and body height diminished gradually up to 21 days after hatching, when all starved larvae died. Every 12 hours after yolk absorption, groups of larvae (n=15, were separeted, and fed with Artemia nauplii for 10 days. The point-of-no-return (when 50% of larvae were unable to feed or to assimilate ingested food after delayed feeding, was not apparent in this species.

  17. Preliminary list of endangered fish species (Pisces, Elasmobranchii , Actinopterygii) in Brazil

    OpenAIRE

    Rosa, Ricardo S; Menezes, Naércio A

    1996-01-01

    The Brazilian fish fauna is still poorly known with respect to its diversity and conservation status, particularly of freshwater species. Human activities and population growth are rapidly impacting this fauna to an unchecked extent, so that many fish species are presently threatened. Also, some areas have been so critically altered that their fish fauna can no longer be properly inventoried. There is an urgent need to evaluate the conservation status of Brazilian fish species, since none are...

  18. [Micropterus salmoides (Pisces: Centrarchidae) reproduction in the Gustavo Diaz Ordaz reservoir, Sinaloa, México].

    Science.gov (United States)

    Beltrán Alvarez, Rigoberto; Sánchez Palacios, Jesús; Ramírez Lozano, Juan Pedro; Ortega Salas, Adolfo-Armando

    2013-09-01

    Micropterus salmoides is an important fish species for sport fishing activities, condition that has promoted its introduction to different reservoirs in Mexico and worldwide. With the aim to improve its fisheries management, this research dealt with some reproductive aspects of this species in the Gustavo Diaz Ordaz reservoir, where it was studied from August 2008 through March 2011. To this end, we obtained 938 specimens, with gillnets of different sizes, to determine their total length (Lt, in cm), weight (Pt, in g), sex, gonadosomatic index, condition factor, fecundity and size at first maturity. Lt and Pt ranged from 15.9 to 63 cm (37.4 +/- 78.0) and 57 to 4431 g (731.7 +/- 619.0), respectively. The Pt-Lt relationship showed a positive allometric growth, with no significant difference between males and females (F = 0.9955, p = 0.3187). The male: female ratio obtained was 1:0.83. Mass spawning lasted from December to April. Size at first maturity was 33.7 cm and average fecundity was 32294 +/- 12878.7 oocytes/female. The gonadosomatic index was low from May through November, and increased between January and March. The condition factor was high before the spawning season and decreased after the reproductive period. We recommend a fishing ban from January to March, and to allow the capture size between 33 and 40 cm.

  19. The European Eel Anguilla anguilla (Pisces, Anguillidae. Native or Alien in the Black Sea?

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    Apostolos I. Apostolou

    2013-12-01

    Full Text Available In 2006 the Scientific, Technical and Economic Committee for Fisheries (STEFC of EU suggested the Black Sea region should be excluded from the list of natural areas, where the European eel (Anguilla anguilla is distributed. The basic conception of this idea was that the eels caught in the Black Sea region represent escaped specimens from fish farming in some Danubian countries. This article illustrates an effort to be given an indirect answer on the question if Black Sea is the end of natural distribution of European eel. The species is present but never been abundant in the region and do not represent an object of commercial fishing.

  20. BIOCHEMICAL AND HISTOLOGICAL EFFECTS OF DELTAMETHRIN EXPOSURE ON THE GILLS OF CARASSIUS AURATUS GIBELIO (Pisces Cyprinidae

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    DIANA COSTIN

    2007-05-01

    Full Text Available This study investigated the alterations in the activities of several antioxidant enzymes inthe gills of the freshwater fish Carassius auratus gibelio exposed to deltamethrin. To getthis goal, groups of 10 individuals were exposed for one, two, three, seven and fourteendays to sublethal concentration of deltamethrin (2 µg/L. Another group was used ascontrol. The activities of catalase, gluthatione peroxidase and gluthatione reductasewere significantly decreased, while the glutathione-S-transferase was up-regulated. Allfish, exposed to 2 µg/L deltamethrin revealed gills morphological alterations after 48h ofexposure which were accentuated after 14 days. In the gills hyperemia, fusion ofsecondary lamellae, epithelial layer rupture and chloride cells proliferation wereobserved. These results suggest that an immediate adaptive response to the oxidativestress appeared, demonstrating alterations in the antoxidant defense mechanism in thegills of deltamethrin intoxicated fish.

  1. Cultivo del pargo de la mancha Lutjanus guttatus (pisces: Lutjanidae en jaulas flotantes.

    Directory of Open Access Journals (Sweden)

    Ricardo Gutiérrez Vargas

    2016-03-01

    Full Text Available En dos ensayos paralelos realizados frente a Playa Pájaros, en el Golfo de Nicoya, se engordaron pargos manchados (Lutjanus guttatus obtenidos del medio hasta 275 y 485 g, respectivamente, usando fauna de descarte obtenida de barcos camaroneros. La tasa de crecimiento fue de 1,87 y 1,7 g/día, respectivamente, el factor de conversión fue de 7,88 (alimento húmedo o 1,77 (alimento seco. La mortalidad se estimó en un 6% en todo el experimento. Se calcularon los costos de alimentación usando la fauna de descarte.

  2. Tapeworms (Cestoda: Caryophyllidea), parasites of Clarias batrachus (Pisces: Siluriformes) in the Indomalayan region.

    Science.gov (United States)

    Ash, Anirban; Scholz, Tomáš; Oros, Mikuláš; Kar, Pradip Kumar

    2011-06-01

    Revision of monozoic cestodes (Caryophyllidea) parasitic in commercially important walking catfish Clarias batrachus (L.) in tropical Asia (Indomalayan zoogeographical region) was carried out, based on the evaluation of newly collected material from India, Indonesia, and Thailand, as well as a study of type specimens. Instead of the 59 nominal taxa of 15 genera from 3 caryophyllidean families previously described, only 8 species of the Lytocestidae are considered to be valid: Bovienia indica (Niyogi, Gupta and Agarwal, 1982) n. comb.; Bovienia raipurensis (Satpute and Agarwal, 1980) Mackiewicz, 1994; Bovienia serialis (Bovien, 1926) Fuhrmann, 1931; Djombangia penetrans Bovien, 1926; Lucknowia microcephala (Bovien, 1926) n. comb.; Lytocestus indicus (Moghe, 1925) Woodland 1926; Pseudocaryophyllaeus ritai Gupta and Singh, 1983; and Pseudocaryophyllaeus tenuicollis (Bovien, 1926) n. comb. All valid species are redescribed and SEM photomicrographs of their scolices and photomicrographs of their eggs are provided for the first time. Crescentovitus Murhar, 1963, Heeradevina Srivastav and Khare, 2005, Pseudobatrachus Pathak and Srivastav, 2005, Pseudobilobulata Srivastav and Lohia, 2002, Pseudoclariasis Pathak, 2002, and Pseudoinverta Pathak, 2002 are invalidated and 50 nominal species are newly synonymized, including 4 species described from other fish hosts. Taxonomic status of the remaining caryophyllidean taxa reported from C. batrachus (at least 6 taxa) could not be clarified because of the unavailability of their original descriptions. A key to identification of caryophyllidean tapeworms parasitic in C. batrachus is provided. To avoid current inflation of descriptions of invalid taxa, researchers are strongly encouraged to work only with well-fixed material; damaged, decomposed, or strongly flattened specimens should not be used for taxonomic studies, and type specimens must always be deposited in internationally recognized collections.

  3. 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.

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

    Science.gov (United States)

    Alwan, Nisreen; Esmaeili, Hamid-Reza; Krupp, Friedhelm

    2016-01-01

    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.

  5. A new trichosomoidid from the skin of Sebastes spp. (Pisces) from British Columbia, Canada

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Conboy, G. A.; Speare, D. J.

    2005-01-01

    Roč. 91, č. 2 (2005), s. 411-414 ISSN 0022-3395 R&D Projects: GA AV ČR IAA6022201 Institutional research plan: CEZ:AV0Z60220518 Keywords : Huffmanela * Sebastes * Canada Subject RIV: EA - Cell Biology Impact factor: 1.524, year: 2005

  6. Developmental characters of Pseitina iijimae (Jordan and Starks), bothid flat fishes- pisces

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    Post larval stages of Psettina iQimae (Jordan and Starks) ranging from 1.8 mm NL to 44.6 mm SL collected during Naga Expedition and International Indian Ocean Expedition (JIOE) are described The characteristics which help to identify larval stages...

  7. New Record of Gadella jordani and Redescription of Physiculus japonicus (Pisces: Moridae in Korea

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    Jin-Koo Kim

    2016-01-01

    Full Text Available We describe the morphological characteristics of two morids, Gadella jordani and Physiculus japonicus, belonging to the order Gadiformes, based on Korean specimens collected from the Korean ocean. Two specimens of Gadella jordani was first collected from Jeju Island, Korea and the East Sea, Korea, in 2013-2014. This species is characterized by 8, 67-69 dorsal fin rays, 66-71 anal fin rays, 5+13 gill rakers, no barbel on the lower jaw, no vomerine teeth, and a ventral luminous organ closer to the anus than to the interventral line. We described it as the first record to the Korean fish fauna, and proposed the new Korean name “Min-su-yeom-dae-gu-sok” for the genus Gadella, and “Min-su-yeom-dae-gu” for the species G. jordani. Physiculus japonicus was first reported by Koh and Moon in the year 1999 based on a single specimen in Korea. However, no study has been attempted to describe the morphological characteristics in Korea since then. In 2013-2014, three specimens of P. japonicus was collected from Jeju Island, Korea and the East Sea, Korea, and we redescribe P. japonicus in detail. This species is characterized by 9-10, 63-64 dorsal fin rays, 70-73 anal fin rays, 3+7-8 gill rakers, a short barbel on the lower jaw, and a ventral luminous organ equidistant between the interventral line and the anus.

  8. Distribution and habitat suitability index model for the Andean catfish Astroblepus ubidiai (Pisces: Siluriformes in Ecuador

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    Luis A Vélez-Espino

    2006-06-01

    Full Text Available In conservation biology there is a basic need to determine habitat suitability and availability. Astroblepus ubidiai (Siluriforms, the only native fish in the highlands of Imbabura province in the Ecuadorian Andes, was abundant in the past in the Imbakucha watershed and adjacent drainages, but currently it is restricted to a few isolated refuges. Conservation actions are needed if this unique fish is to persist. A Habitat Suitability Index (HSI for the species has been developed in order to aid management decisions. In this HIS model biomass density (B was selected as a better indicator of habitat quality than either abundance or density. A population well-being index (PI was constructed with the combination of B and an indicator of fish health (proportion of fish in the population with parasites and deformities. Based in other models of benthic fish the habitat variables current velocity, flow, depth, width, cover, invertebrate composition, vegetation type, terrestrial vegetation, land use, substrate, temperature, pH, TDS, oxygen, altitude, and slope were included in the analysis. An anthropogenic perturbation index (H and a fragment isolation index (FII were developed and included as habitat variables as well. The HSI model was applied to refuges and a sample of 15 aquatic bodies without fish populations within the study region. From the sampled sites without A. ubidiai 26.6% presented low quality, and the remaining 73.3% had medium quality according to the HSI estimated. Good quality habitat for dispersal, escape or translocations is rare in the region. The low HSIs estimated in some of the refuges suggests that current populations are not settled in the most favorable habitat but in the habitat least favorable to the agents of decline. Rev. Biol. Trop. 54(2: 623-638. Epub 2006 Jun 01.Astroblepus ubidiai (Siluriformes, el único pez nativo de las alturas de Imbabura, en los Andes Ecuatorianos, era un recurso abundante en el pasado. Actualmente su distribución está limitada a unos cuantos refugios aislados. Se necesitan acciones de conservación para que esta especie perdure. Se desarrolló un modelo para estimar el índice de calidad de hábitat (ICH que ayude en futuras decisiones de manejo. En este ICH la densidad de biomasa (B fue seleccionada como un mejor indicador de calidad de hábitat, comparada con el uso común de abundancia o densidad incorporado en otros modelos. Se generó un índice de bienestar poblacional (IP basado en B y en un indicador de salud poblacional (SP derivado de la proporción de peces en la población con parásitos y malformaciones. Diecinueve variables físicas, biológicas y geográficas fueron evaluadas dentro del modelo, el cual fue aplicado a una muestra de 15 sitios sin poblaciones de A. ubidiai dentro del área de estudio. De esta muestra, 26.6% de los sitios presentó baja calidad de hábitat, y el restante 73.3% presentó calidad media de acuerdo a la evaluación con el modelo. En la región hay escasos hábitats de buena calidad para dispersión, escape y reubicación de este pez.

  9. Spinitectus tabascoensis sp. nov. (Nematoda, Cystidicolidae) from Ictalurus furcatus (Pisces) in southeastern Mexico

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; García-Magana, L.; Salgado-Maldonado, G.

    2002-01-01

    Roč. 47, č. 3 (2002), s. 224-227 ISSN 1230-2821 R&D Projects: GA AV ČR IAA6022901 Institutional research plan: CEZ:AV0Z6022909 Keywords : parasitic nematode * Spinitectus * fish Subject RIV: EG - Zoology Impact factor: 0.732, year: 2002

  10. Labores Piscícolas en la Facultad Nacional De Agronomía

    Directory of Open Access Journals (Sweden)

    Ruiz Landa Eduardo

    1939-12-01

    Full Text Available Una de las principales obligaciones de todo gobierno es el cuidado de las riquezas naturales constituidas por la Fauna del país, regulando su aprovechamiento y asegurando en los casos en que sea posible, su conservación y mejoramiento; evitando que por explotación inmoderada o cualquiera otra causa, se extingan o disminuyan las existencias de animales útiles, y agregando a las especies nativas otras extranjeras cuya aclimatación pueda obtenerse y que al ser propagadas crean una adición valiosa a los recursos de pesca. Siguiendo esas normas, la Facultad Nacional de Agronomía y un grupo de particulares patrocinados por el doctor Francisco Navarro Ospina, llevan a cabo la buena iniciativa de acrecentar y mejorar los recursos de pesca, mediante la introducción, aclimatación y reproducción de distintas variedades exóticas de peces de aguas dulces útiles, adaptables a las condiciones naturales existentes en el Departamento de Antioquia para hacer su distribución en los ríos, arroyos, quebradas, etc. Se importó de Cuba en agosto del año de 1938 un lote de peces, consistente en 48 pequeñas Crías, de las cuales 24 de la especie conocida como "Largemouth Black Bass" (Huro Floridana y 24 de la especie conocida como "Carpa" (Ciprinus Carpio, las que se aclimataron perfectamente tanto que de las primeras ya estamos actualmente haciendo su distribución, después de haberse reproducido en condiciones admirables

  11. Ultrastructure (SEM of the gills of Prochilodus Scrofa Steindachner (Pisces, Teleostei

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    Daura Regina Eiras-Stofella

    1998-01-01

    Full Text Available Gills arches of the freshwater fish Prochilodus scrofa Steindachner, 1881 (Lt= 8.0-12.4cm were removed to be analyzed in a scanning electron microscope. The morphology of the superficial structures of the gill filaments and pharyngeal region of the gills arches was discussed and related to their functional aspects. A great quantity of mucous secretory cells and of microridges, along with the pavement cell surface of the primary lamellae and branchial pharyngeal region, indicate the existence of a protection strategy of the respiratory lamellae. The chloride cells are abundant, specially on the distal portion of the primary lamellae, and bring out the osmo regulatory capacity of this species. This fish seems not to be a filtering one according to: its short and simple gill rakers; presence of several taste buds turned towards the mouth opening; evidence of spines on the external side of the arches and an abundant secretion of mucous in the pharyngeal region. This species probably selects the food to be swallowed through its chemical receptors and retains it with the help of spines and mucous secretion this way protecting the gills filaments against the rubbing of particles over them.

  12. Effect of body size and temperature on respiration of Galaxias maculatus (Pisces: Galaxiidae)

    Science.gov (United States)

    Milano, D.; Vigliano, P.H.; Beauchamp, David A.

    2017-01-01

    Body mass and temperature are primary determinants of metabolic rate in ectothermic animals. Oxygen consumption of post-larval Galaxias maculatus was measured in respirometry trials under different temperatures (5–21°C) and varying body masses (0.1–>1.5 g) spanning a relevant range of thermal conditions and sizes. Specific respiration rates (R in g O2 g−1 d−1) declined as a power function of body mass and increased exponentially with temperature and was expressed as: R = 0.0007 * W −0.31 * e 0.13 * T. The ability of this model to predict specific respiration rate was evaluated by comparing observed values with those predicted by the model. Our findings suggest that the respiration rate of G. maculatus is the result of multiple interactive processes (intrinsic and extrinsic factors) that modulate each other in ‘meta-mechanistic’ ways; this would help to explain the species’ ability to undergo the complex ontogenetic habitat shifts observed in the lakes of the Andean Patagonic range.

  13. On Hypopygus lepturus, a little known dwarf gymnotid fish from South America (Pisces, Cypriniformes, Gymnotoidei)

    NARCIS (Netherlands)

    Nijssen, H.; Isbrücker, I.J.H.

    1972-01-01

    Hypopygus lepturus Hoedeman, 1062, was hitherto known from the holotype and one paratype only, both imported aquarium specimens. In this paper the type locality of the species is restricted. Additional distributional data from Surinam are given, together with records on the occurrence of H. lepturus

  14. Notes on Gobioid fishes : 6. On the synonymy of some species from the Indo-Australian Archipelago

    NARCIS (Netherlands)

    Koumans, F.P.

    1935-01-01

    Bathygobius fuscus (Rüpp.) Gobius fuscus Rüppell, Atl. Reise N. Afr. Fische 1828, p. 137. Gobius punctillatus Rüppell, l.c., p. 138. Gobius soporator Cuvier & Valenciennes, Hist. Nat. Poissons XII. 1837, p. 56. Gobius albopunctatus Cuvier & Valenciennes, l.c., p. 57. Gobius nebulopunctatus Cuvier &

  15. Sharks caught in the KwaZulu-Natal bather protection programme ...

    African Journals Online (AJOL)

    The current study provides long-term catch rate and biological data for tiger sharks Galeocerdo cuvier caught in the KwaZulu-Natal bather protection programme. Between 1978 and 2014, 1 760 G. cuvier were caught in nets and between 2007 and 2014, 108 G. cuvier were caught on drumlines. Standardised catch rates ...

  16. Calcium and phosphorus determination in bones of low value fishes, Sardinella longiceps (Valenciennes and Trichiurus savala (Cuvier, from Parangipettai, Southeast Coast of India

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    Logesh AR

    2012-05-01

    Full Text Available Objective: To investigate calcium and phosphorus levels in the bones of low value fishes Sardinella longiceps (oil sardine and Trichiurus savala (ribbon fish. Methods: Bones and skeletal remains were subjected to alkaline-alcohol treatment for specified period of time and were then dried and pulverized. Calcium and phosphorus levels were determined by both volumetric and instrumental methods using atomic absorption spectroscopy. Results: Volumetric analysis of calcium and phosphorus were 28.98% and 14.2% in oil sardine; 24.2% and 11.6% in ribbon fish respectively. Atomic absorption spectroscopy analysis of calcium and phosphorus were 32.73% and 17.2% for oil sardine and 27.17% and 10.83% for ribbon fish respectively. Protein level was 4.82% in oil sardine and 3.97% in ribbon fishes. Conclusions: The findings of the present study revealed that sardine bones are rich in calcium and will be utilized for the production of calcium powder to treat osteoporosis.

  17. 3D Reconstruction of the Digestive System in Octopus vulgaris Cuvier, 1797 Embryos and Paralarvae during the First Month of Life

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    Raquel Fernández-Gago

    2017-07-01

    Full Text Available Octopus vulgaris aquaculture is limited due to poor biological knowledge of the paralarval stages (e.g., digestive system functionality, their nutritional requirements (e.g., adequate live diet and standardization of rearing techniques. These factors are important in explaining the high mortality rate observed in this developmental stage under culture conditions. For a better understanding of nutrition biology of this species, we investigated the 3D microanatomy of the digestive tract of the embryo and paralarvae during the first month of life. O. vulgaris paralarvae digestive system is similar to that in the adult. The “descending branch” has a dorsal position and is formed by the buccal mass, oesophagus and crop. Ventrally, the “ascending branch” is formed by the intestine and the anus. The digestive gland, the posterior salivary glands and the inner yolk sac (in the case of the embryo and hatched paralarvae are located between the “ascending” and “descending” branches. In the curve of the U-shaped digestive tract, a caecum and the stomach can be found. The reconstructions reveal that anatomically the digestive system is already complete when the paralarvae hatch. The reconstruction of the buccal mass at different post-hatching days has demonstrated that all the necessary structures for food intake are present. However, the radula surface in contact with the pharynx is very small on the first day of life. Although the digestive system has all the structures to feed, the digestive gland and radula take longer to reach full functionality. We have established four development periods: embryonic, early post-hatching, late post-hatching and juvenile-adult. The differentiation between these periods was done by type of feeding (endogenous or exogenous, the state of maturation and hence functionality of the digestive gland, type of growth (linear, no net, or exponential, and measurement of the arm lengths with respect to the mantle length. 3D reconstruction represents a new tool to study the morphology and functionality of the cephalopod digestive system during the first days of life.

  18. Helmintos parasitos das espécies Scomberomorus cavalla (Cuvier e Scomberomorus maculatus (Mitchill do litoral cearense: Contracaecum fortalezae sp. n. (Nematoda, Ascaridoidea

    Directory of Open Access Journals (Sweden)

    Vera Lucia M. Klein

    1973-01-01

    Full Text Available De nematódeos encontrados parasitando estômago, intestinos delgado e grosso de Scomberomorus cavalla (Cuv. e Scomberomorus maculatus (Mitch. o autor propões para o gênero Contracaecum Railliet et Henry, 1912 uma nova espécie, C. fortalezae sp. n., que mais se aproxima de C. clavatum (Rud., 1809 Baylis, 1920 dela se diferenciando por possuir espículos desiguais, um curto ovejetor, útero opistodelfo, ovos menores e por apresentar em todos exemplares estudados ceco intestinal curto e ceco esofagiano longo.In this paper the author proposes a new species of the genus Contracaecum Railliet et Henry, 1912. Of the species under Contracaecum, Contracaecum clavatum (Rudolphi, 1809 Baylis, 1920 is the nearest to Contracaecum fortalezae sp. n. differing from the latter by the following aspects: The males have unequal spicules. The females have a short ovijector and parallel uteri directed backward and the eggs are smaller. In both sexes the intestinal cecum is always short and the ventricular posterior appendix is always long, while Contracaecum clavatum presents these structures in an inverse way, considering the lenght of them. Besides, the thorn-like formations at the posterior end of the body are different.

  19. Growth and survival of Octopus vulgaris (Cuvier 1797 paralarvae fed on three Artemia-based diets complemented with frozen fish flakes, crushed zooplankton and marine microalgae

    Directory of Open Access Journals (Sweden)

    Lidia Fuentes

    2011-07-01

    Full Text Available During one month, paralarvae of common octopus (Octopus vulgaris were fed 3 different diets: (1 Artemia sp. enriched with Isochrysis galbana (AI complemented with sand eel (Hyperoplus lanceolatus flakes (AH; (2 Artemia sp. enriched with crushed marine zooplankton (AZ; and (3 Artemia sp. cultured with Isochrysis galbana and further enriched with the microalga Nannochloropsis sp. (AN. The highest dry weight (1.6179±0.3861 mg was registered with the AN diet and the best average survival (67.0% with the AZ diet. Considering the highest dry weight obtained, the moderate high survival and the fact that with this diet it was possible to attain the adult stage, the AN diet was the most appropriate. The reasons for the best result in growth observed with AN are discussed as: (1 the combination of docosahexaenoic acid (DHA provided by Isochrysis galbana and the high eicosapentaenoic acid (EPA content present in Nannochloropsis sp.; (2 the fact that the higher protein/lipid ratio of this diet improves the final dry weight of the paralarvae; and (3 the fact that Nannochloropsis sp. could inhibit the harmful microflora growth in the rearing tank. Regarding nutritional aspects, DHA content per se is not the only determinant factor for growth and survival of O. vulgaris paralarvae, but the presence of a high protein/lipid ratio and a high phospholipid content in the diet could possibly explain the better quality and strength of the paralarvae.

  20. The growth and exploitation rate of yellowstripe scad (selaroides leptolepis cuvier, 1833) in the Malacca Strait, Medan Belawan Subdistrict, North Sumatera Province

    Science.gov (United States)

    Tambun, J.; Bakti, D.; Desrita

    2018-02-01

    Yellowstripe scad included the one of commodity that has an important economic value in the Malacca Strait. Fish were found mostly in Indonesian of waters made this fish as one of the main target catch. But, it can had negative impact on the population of the fish. The study is done at Belawan Waters on March until May 2017 that which is purposed to study about the frequency distribution of length, determine the parameters of growth and, determine mortality rate and the rate of exploitation in order to provide appropriate management model for the fish resource. Yellowstripe scad was observed around 360 samples with the length range between 110 - 175 mm. The fish separated by bhattacarya method used the aid software FISAT II. A pattern of growth Yellowstripe scad alometrik negative with growth coefisien (K) 1.1 with length asimtotic (L∞) 181.65. The rate of mortality total ( Z) yellowstripe scad 4.34 per year at the rate of mortality natural ( M ) 1.204 per year and rate mortality by fishing (F) 3.136 per year in order to obtain the rate of exploitation 0.722. The value of this exploitation rate has exceeded the value of the optimum exploitation of 0.5.

  1. Avances en el conocimiento y el estado actual de conservación del Cocodrilo de Tumbes (Crocodylus acutus Cuvier, 1807

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    Armando H. Escobedo Galván

    2013-06-01

    Full Text Available En esta nota se describe el estado de conservación del Cocodrilo de Tumbes en Perú, donde la especie encuentra su límite sur de distribución, por lo que es catalogada como especie rara en la zona. Esto ha generado que se lleven a cabo programas de manejo ex situ para apoyar su conservación. Sin embargo el desconocimiento de los beneficios que brinda la especie, junto con la deforestación, el cambio climático y las actividades antropogénicas, han ocasionado que su población disminuya y se encuentre amenazada.

  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. Molecular diagnosis of the arowanas Osteoglossum ferreirai Kanazawa, 1966 and O. bicirrhossum (Cuvier, 1829 from the Orinoco and Amazon River basins

    Directory of Open Access Journals (Sweden)

    Maria Doris Escobar L.

    Full Text Available The arowanas, fishes of Gondwanan origin, are represented in South America by the genus Osteoglossum. All species were initially reported as being exclusive to the Amazon region, with O. ferreirai restricted to the Negro River basin and O. bicirrhosum to the Amazon and Essequibo Rivers basin. Starting in the mid 1970's it was reported that O. ferreirai also occurs in the Orinoco River basin. In all regions the arowanas assumed significant socio-economic importance due to their popularity in the international ornamental fish trade, leading to over-exploitation of both species in some areas. The Orinoco populations are particularly heavily exploited, and thus conservation and management measures are needed. Both depend on the clarification of taxonomic status, and phylogenetic distinctness of the Orinoco populations. With the goal of molecularly characterizing the two species of Osteoglossum, and comparing populations of Osteoglossum from the Orinoco and Amazon basins, we characterized individuals sampled from eight localities, one in the Orinoco River basin and seven in the Amazon River basin. We sampled 39 individuals, obtaining 1004 base pairs, of which 79 were synapomorphies. Genetic distance between the two species calculated using the HKY + G model of molecular evolution was 8.94%. Intraspecific distances ranged from 0.42% in O. bicirrhosum to 0.10% in O. ferreirai. The genetic characterization confirmed the taxonomic status of O. ferreirai in the Orinoco basin, and suggested that its distribution in the Orinoco basin is unlikely to be the result of vicariance or natural dispersal, but rather an anthropic introduction.

  4. Feeding of Oligosarcus hepsetus (Cuvier, 1829 (Characiformes in the Serra do Mar State Park - Santa Virgínia Unit, São Paulo, Brazil

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    MLLA Botelho

    Full Text Available We describe the diet of Oligosarcus hepsetus, in the Santa Virgínia Unit of the Serra do Mar State Park. The Paraibuna and Grande rivers in the basin of the Paraíba do Sul River were sampled monthly from January to December 2004. The Alimentary Preference Degree and the frequency of occurrence indices were used to analyze the food items. The diets of Oligosarcus hepsetus in the two localities sampled were very similar, and reinforced the importance of the streamside forests in establishing and maintaining biotic and abiotic conditions in these environments. The species had a carnivorous diet that differed with ontogeny: smaller individuals were principally insectivorous and larger ones ichthyophagous.

  5. 3D Reconstruction of the Digestive System in Octopus vulgaris Cuvier, 1797 Embryos and Paralarvae during the First Month of Life.

    Science.gov (United States)

    Fernández-Gago, Raquel; Heß, Martin; Gensler, Heidemarie; Rocha, Francisco

    2017-01-01

    Octopus vulgaris aquaculture is limited due to poor biological knowledge of the paralarval stages (e.g., digestive system functionality), their nutritional requirements (e.g., adequate live diet) and standardization of rearing techniques. These factors are important in explaining the high mortality rate observed in this developmental stage under culture conditions. For a better understanding of nutrition biology of this species, we investigated the 3D microanatomy of the digestive tract of the embryo and paralarvae during the first month of life. O. vulgaris paralarvae digestive system is similar to that in the adult. The "descending branch" has a dorsal position and is formed by the buccal mass, oesophagus and crop. Ventrally, the "ascending branch" is formed by the intestine and the anus. The digestive gland, the posterior salivary glands and the inner yolk sac (in the case of the embryo and hatched paralarvae) are located between the "ascending" and "descending" branches. In the curve of the U-shaped digestive tract, a caecum and the stomach can be found. The reconstructions reveal that anatomically the digestive system is already complete when the paralarvae hatch. The reconstruction of the buccal mass at different post-hatching days has demonstrated that all the necessary structures for food intake are present. However, the radula surface in contact with the pharynx is very small on the first day of life. Although the digestive system has all the structures to feed, the digestive gland and radula take longer to reach full functionality. We have established four development periods: embryonic, early post-hatching, late post-hatching and juvenile-adult. The differentiation between these periods was done by type of feeding (endogenous or exogenous), the state of maturation and hence functionality of the digestive gland, type of growth (linear, no net, or exponential), and measurement of the arm lengths with respect to the mantle length. 3D reconstruction represents a new tool to study the morphology and functionality of the cephalopod digestive system during the first days of life.

  6. Identification of a Δ5-like fatty acyl desaturase from the cephalopod Octopus vulgaris (Cuvier 1797) involved in the biosynthesis of essential fatty acids.

    Science.gov (United States)

    Monroig, Oscar; Navarro, Juan C; Dick, James R; Alemany, Frederic; Tocher, Douglas R

    2012-08-01

    Long-chain polyunsaturated fatty acids (LC-PUFA) have been identified as essential compounds for common octopus (Octopus vulgaris), but precise dietary requirements have not been determined due, in part, to the inherent difficulties of performing feeding trials on paralarvae. Our objective is to establish the essential fatty acid (EFA) requirements for paralarval stages of the common octopus through characterisation of the enzymes of endogenous LC-PUFA biosynthetic pathways. In this study, we isolated a cDNA with high homology to fatty acyl desaturases (Fad). Functional characterisation in recombinant yeast showed that the octopus Fad exhibited Δ5-desaturation activity towards saturated and polyunsaturated fatty acyl substrates. Thus, it efficiently converted the yeast's endogenous 16:0 and 18:0 to 16:1n-11 and 18:1n-13, respectively, and desaturated exogenously added PUFA substrates 20:4n-3 and 20:3n-6 to 20:5n-3 (EPA) and 20:4n-6 (ARA), respectively. Although the Δ5 Fad enables common octopus to produce EPA and ARA, the low availability of its adequate substrates 20:4n-3 and 20:3n-6, either in the diet or by limited endogenous synthesis from C(18) PUFA, might indicate that EPA and ARA are indeed EFA for this species. Interestingly, the octopus Δ5 Fad can also participate in the biosynthesis of non-methylene-interrupted FA, PUFA that are generally uncommon in vertebrates but have been found previously in marine invertebrates, including molluscs, and now also confirmed to be present in specific tissues of common octopus.

  7. Growth of Octopus vulgaris (Cuvier, 1797 in tanks in the Ebro Delta (NE Spain: effects of temperature, salinity and culture density

    Directory of Open Access Journals (Sweden)

    Marina Delgado

    2010-11-01

    Full Text Available To assess the possibility of O. vulgaris ongrowing using tanks or cages in the bays of the Ebro Delta, we performed several growth trials of common octopus held in tanks. Effects of environmental factors (temperature and salinity and zootechnical aspects (culture density were studied. The thermal ranges that defined positive growth periods in the bays of the Ebro Delta were 19.5ºC to 23ºC (spring-summer and 23.5ºC to 12.3ºC (autumn-winter, the latter being the most suitable period for ongrowing. Salinity did not affect survival (100% or growth within the range tested (34-29 psu, though feeding rates (AFR, SFR were directly related to salinity. On the other hand, after 60 days, final culture density increased three-fold (D1: 12.36 → 44.37 kg m–3; D2: 24.13 → 67.76 kg m–3, with optimal survival results ( > 90% for the two densities tested. Growth and feeding rates showed a slight inverse relationship with density. Finally, growth and feeding rates showed a clear dependence on temperature in the two experiments (density and salinity. Our results conclude that industrial production of O. vulgaris in tanks is promising: this system offers an alternative to cages and allows for a more exhaustive control of culture.

  8. Allometric variation among juvenile, adult male and female eastern bearded dragons Pogona barbata (Cuvier, 1829), with comments on the behavioural implications.

    Science.gov (United States)

    Wotherspoon, Danny; Burgin, Shelley

    2011-02-01

    The functional significance of allometric change in reptiles has received limited attention and the reason for such changes has been regarded as 'obscure'. In this paper we report data on the Australian Pogona barbata, the eastern bearded dragon, from across their range and review changes in allometric growth among juveniles, and adult males and females and consider the functional relevance of these changes. There were significant differences in the population for mass, tail length, tail width, rear leg length and jaw length. These differences were consistent with differences required in locomotor performance and thus habitat use, together with access to different preferred dietary components. Crown Copyright © 2011. Published by Elsevier GmbH. All rights reserved.

  9. Macro and microscopic structure of parotids salivary glands in two species of procyonidae: raccoon (Procyon cancrivorus, G. Cuvier, 1798 and coati (Nasua nasua, Linnaeus, 1766

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    Celina Almeida Furlanetto Mançanares

    2012-03-01

    Full Text Available Coati (Nasua nasua, a diurnal animal, and raccoon (Procyon cancrivorus, a crepuscular and nocturnal one, are species of terrestrial mammals, belonging to the procyonidae family, that are widely found in the Brazilian territory. For this work were used three adult coatis and two adult raccoons adults from the Scientific Breeding-Cecrimpas of Centro Universitario da Fundacão de Ensino Octávio Bastos (Ibama 02027.003731/04-76 were used, from which tissue samples of parotid salivary glands were obtained and stained H.E. for light microscopy. It was found that the parotid glands of coatis and raccoons has a positioning similar to that of the other domestic carnivores, opening their ducts within the oral cavity close to the fourth upper premolar tooth, as well as that histologically the parotid glands of coatis and raccoons are formed by serous acini, similarly to most of the domestic animals, humans beings and rodents, and differently from the results found in young dogs, lambs and some carnivores such as the ferret which have mixed acini and other ones which have serous. One concludes that the similarity in serous constitution of the parotid glands of coatis and raccoons might be due to the omnivorous feeding habit shared by these two species.

  10. Histopathological study of lymphocystis disease virus (LCDV in cultured false clownfish, Amphiprion ocellaris (Cuvier, 1830 and true clownfish, Amphiprion percula (Lacepede, 1802

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    Muthuramalingam Uthaya Siva

    2014-04-01

    Full Text Available Objective: To study the lymphocystis disease virus (LCDV in two species of marine ornamental fishes through histopathological investigation along with control for differentiating the tissue damage. Methods: Six naturally infected fishes were collected. They were anaesthetized and subsequently killed by organ dissection. The infected fish organs were aseptically cut off and stored with 10% formalin solution for histological study. Samples were examined for gross pathology including location, distribution, shape, size, colour, consistency and special features of typical external lesions by standard method. Results: The diameter of the tumor nodules ranged from 1 to 2 mm (Amphiprion ocellaris and 2.5 to 3.5 mm (Amphiprion percula. Light microscopic observation showed over growth of tumor like nodules on the skin or scales and ventral side as well. Numerous hypertrophied cells with basophilic intracytoplasmic inclusion bodies were in the connective tissues of dermis and between scales on two species. The nucleus of lymphocystis cell were enlarged, irregular and containing basophilic marginated chromatin. Thus, the similarities among cellular patterns of different fish LCDV isolates from different hosts indicated that these profiles do not depend on the host species. Conclusions: In conclusion, this current study of histopathological statement of LCDV may be adequate for a presumptive diagnosis of lymphocystis disease from both marine as well as fresh water fish species. The findings of asymptomatic carriers by histology using infected skin and fin sampling, which does not imply animal killing, could be important tool to epizootics caused by LCDV. This study may be very useful for further molecular studies.

  11. Philometra johnii sp nov (Nematoda, Philometridae), a new gonad-infecting philometrid from the sin croaker Johnius dussumieri (Cuvier) (Perciformes, Sciaenidae) from marine waters of Iraq

    Czech Academy of Sciences Publication Activity Database

    Moravec, František; Ali, A. H.

    2013-01-01

    Roč. 58, č. 3 (2013), s. 263-268 ISSN 1230-2821 R&D Projects: GA ČR GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Parasitic nematode * Philometra * new species * marine fish * Johnius * Iraq * Arabian Gulf Subject RIV: EA - Cell Biology Impact factor: 0.965, year: 2013

  12. HÁBITOS ALIMENTICIOS DE LA ARAHUANA Osteoglossum bicirrhosum (CUVIER, 1829 EN LA CUENCA MEDIO DEL RÍO PUTUMAYO - EL ESTRECHO, LORETO, PERÚ

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    Bray Torres Del Castillo

    2012-06-01

    Full Text Available El objetivo del presente trabajo fue estudiar los hábitos alimenticios de la arahuana Osteoglossum bicirrhosum en la cuenca media del río Putumayo. Para tal fin, fueron colectados un total de 222 estómagos de especímenes de varias tallas, durante el período de un año, iniciándose en marzo de 2008 y concluyendo en abril de 2009. El análisis del contenido estomacal determinó que el 73% de los estómagos contenían alimento y el 27% no. Mediante el uso del índice de importancia alimenticia (IAi, y el coeficiente alimenticio (Q, se observó una preferencia por los insectos, peces y moluscos, siendo las aves, mamíferos y restos vegetales alimentos secundarios. No se registraron diferencias significativas en el consumo de alimento de acuerdo al régimen hidrológico (p>0.05 ni al sexo (p>0.05. El análisis del IAi y Q, nos indica que el consumo de insectos presenta una relación inversa a los rangos de talla, es decir, a mayor nivel de talla menor consumo de insectos. En contraste, el consumo de peces se incrementó con el tamaño de los ejemplares de arahuana. En conclusión, la arahuana, en el rango de talla estudiado (de 31 a 87 cm, presenta un comportamiento alimenticio generalista y oportunista, de régimen omnívoro con fuerte tendencia a la carnivoría.

  13. Caracterização genética do pirarucu Arapaima gigas (Cuvier) (Teleostei, Osteoglossidae) da bacia Tocantins-Araguaia, estado do Mato Grosso.

    OpenAIRE

    Débora Karla Silvestre Marques

    2003-01-01

    Os Osteoglossiformes são representados na América do Sul pelos gêneros Arapaima e Osteoglossum, que ocorrem particularmente na região Amazônica, nas bacias Amazônica e Tocantins-Araguaia. Os estudos genéticos neste grupo são praticamente inexistentes, evidenciando a necessidade de informações para programas de conservação. A espécie Arapaima gigas da bacia hidrográfica Tocantins-Araguaia apresentou um 2n=56 cromossomos, com fórmula cariotípica 28M/SM+28ST/ A. A marcação por nitrato de p...

  14. Tongue anato-histology of the oceanodromous adult Rastrelliger brachysoma (Bleeker, 1851 with a note on the comparison with the tongue structure of adult R. kanagurta (Cuvier, 1816

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    Jes Kettratad

    2017-02-01

    Full Text Available Anatomical and histological structures of the tongue tissue of Rastrelliger brachysoma and R. kanagurta were investigated. Anatomical structure of the tongue in R. brachysoma was poorly developed and was of triangular shape. The histological and histochemical technique showed the tissue to be principally composed of three layers: tunica mucosa, tunica submucosa and osteocartilagionous skeleton. Stratified epithelium of its mucosal surface was interrupted with several cell types including goblet cells and taste buds. Numerous teeth with elongated shape were also found centrally on the anterior tip of the tongue. They are found among a few dermal papillae of the tongue. Tunica submucosa consisted of connective tissue, blood vessels and pigment cells. When compared anatomically and histologically with that of R. kanagurta, the overall morphological was quite similar. However, some histological structures including taste buds and teeth of R. kanagurta were rarely seen. Rastrelliger kanagurta also tended to have more goblet cell than R. brachysoma. Rastrelliger kanagurta tended to possess less overall histological structures of the tongue. This difference could potentially cause by different feeding adaptation between the two species. Regardless of the differences found between the two species, both are still considered as herbivores.

  15. Gonadossomatic relation and reproductive strategy of Brycon opalinus (Cuvier, 1819 in the Serra do Mar State Park - Núcleo Santa Virgínia, Atlantic Forest, Brazil

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    LM Gomiero

    Full Text Available The objective of this study was to analyze the gonadossomatic relation of males and females of Brycon opalinus (the Pirapitinga do Sul in the Serra do Mar State Park-Núcleo Santa Virgínia. The study area included three rivers: Paraibuna, Ipiranga, and Grande. From the gonadossomatic relation, it was possible to determine the reproductive season and strategy of this species. The gonadossomatic relation was high throughout the year for both males and females. Sperm competition and dilution of the ejaculate in the spawning locations favored substantial development of the testicles. The sex ratio of Brycon opalinus was always in favor of females. The existence of sexual dimorphism in this species was confirmed from the larger size of the females.

  16. Odontesthes mirinensis, sp.n. um novo peixe-rei (Pisces, Atherinidae, Atherinopsinae para o extremo sul do Brasil Odontesthes mirinensis, sp.n. a new silverside (Pisces, Atherinidae, Atherinopsinae from southern Brazil

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    Marlise de Azevedo Bemvenuti

    1995-01-01

    Full Text Available Odontesthes mirinensis, a new species of silverside, is described in coastal lagoons system of Rio Grande do Sul, Brazil. The new species is distinguished from other Odontesthes species by short snout and having 24-29 gill rakers on the lower branch of the first branchial arch. Osteological features (bones of the skull, axial skeleton and girdles are included and discussed. Meristic and morphometric variables were analyzed separately, through multivariate procedures. Principal Component Analysis show that Odontesthes mirinensis, sp.n. does not exhibit significant geographic variation on body shape.

  17. Seleção de presas emalhadas em redes de espera por piranhas, Serrasalmus spilopleura e S. marginatus (Pisces, Serrasalmidae Selection of netted prey by piranhas, Serrasalmus spilopleura and S. marginatus (Pisces, Serrasalmidae

    Directory of Open Access Journals (Sweden)

    Elineide Eugenio Marques

    2001-05-01

    Full Text Available A freqüência de ataque de piranhas aos peixes emalhados foi analisada a partir de capturas mensais utilizando redes de espera, expostas durante 24 horas, com despescas a cada 8 horas, no período de junho de 1987 a maio de 1988, em lagoas, canais e rios da planície de inundação do alto Paraná, Brasil. Os peixes capturados foram identificados e as marcas de ataque de piranhas às nadadeiras e ao corpo registradas. A probabilidade de detecção das espécies emalhadas, a estrutura corpórea e aspectos comportamentais foram os fatores determinantes do ataque seletivo das piranhas. A relação da freqüência de ataque com a abundância relativa de presas por predador não foi significativa. A composição da comunidade foi o fator determinante da freqüência de ataque diferenciada entre os ambientesThe frequency of attacks by piranhas on specimens of netted fish was analyzed from monthly catches in gill nets set out for 24 hours and checked every 8 hours, from June 1987 through May 1988, in lakes, channels, and rivers of the upper Paraná river floodplain, Brazil. Captured fish were identified and marks of attack by piranhas on their fins and flesh were recorded. The probability of detection of netted fishes, their body structure, and behavioral aspects were the factors determining the selective piranhas attacks. There was no significant relationship between the frequency of predator attacks and the relative abundance of the prey. Community composition was the main factor determining the attack frequency, which differed according to environment

  18. 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.

  19. Morfologia e ultraestrutura de arcos branquiais de juvenis de Mugil platanus Günther (Pisces, Mugilidae Gill arch surface morphology and ultrastructure of juvenile Mugil platanus Günther (Pisces, Mugilidae

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    José Claro da Fonseca Neto

    1999-06-01

    Full Text Available Scanning electron microscopy revealed that the gill arch surface from juveniles of Mugil platanus Günther, 1880 is similar to that reported for others euryhaline teleosts. Two filament rows (about 41-49 filament per row extend posteriorly, and two rows of rakers (about 42-46 rakers per row extended anteriorly from each arch. Respiratory lamellae protrude along both sides of each filament (37/mm, from the base to the apex. The distribution, sizes and structure of various surface cells were also described. Except for the respiratory lamellae, the surface of whole gill arch is covered by a mosaic of pavement cells, which measure about 6,94X4,61µm and exhibit concentrically arranged surface ridges. The anterior pharyngeal surfaces of the raker of the first arch and the ventral part of the second, smooth secondary projections are present which are replaced by spiny secondary projections on the dorsal part of the second arch, and entire third and fourth arches. Taste buds are especially prominent between smooth projections. Apical ciypts of chloride cells oceur mostly at the afferent surface of the gill filament.

  20. Parasite body volume and infracommunity patterns in the southern pomfret Brama australis (Pisces: Bramidae Volumen corporal del parásito y patrones infracomunitarios en la reineta Brama australis (Pisces: Bramidae

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    MARIO GEORGE-NASCIMENTO

    2002-12-01

    Full Text Available The patterns of infracommunity descriptors (diversity, dominance, abundance are compared when calculated with the number and body volume of the parasites in a sample of 26 southern pomfrets Brama australis collected in the area off Talcahuano, Chile. No numerical infracommunity descriptor was correlated with its corresponding volumetric descriptor. This single result casts doubts about the general validity of the infracommunity patterns described in the literature so far, because they are almost exclusively based on the number of parasite individuals per individual host, restricting communication with ecologists that use density or other measures of ecological abundanceLos patrones de los descriptores infracomunitarios (diversidad, dominancia, abundancia son comparados cuando son calculados en base a los números o al volumen corporal de los parásitos en una muestra de 26 reinetas Brama australis recolectadas en el área de Talcahuano, Chile. Ningún descriptor infracomunitario calculado con el número de parásitos estuvo correlacionado con los basados en el volumen corporal de los parásitos. Este resultado siembra dudas acerca de la validez general que pueden tener los patrones infracomunitarios registrados en la literatura ya que están casi exclusivamente calculados con el número de parásitos por individuo hospedador, lo que dificulta aún más la comunicación con los ecólogos, que usan la densidad u otras medidas de abundancia ecológica

  1. Desenvolvimento osteológico de Hippocampus reidi Ginsburg (Pisces, Syngnathiformes, Syngnathidae, em laboratório: II. Período juvenil Osteologic development of Hippocampus reidi Ginsburg (Pisces, Syngnathiformes, Syngnathidae, under laboratory conditions: II. Juvenile phase

    Directory of Open Access Journals (Sweden)

    Rosana Beatriz Silveira

    2000-06-01

    Full Text Available The sequence of events of the ossification process in the newly bom specimens of Hippocampus reidi Ginsburg, 1933 up to 37 days of life has been described, mainly the ossification in the ethmoid plate, palatine, pectoral girdle, and postorbital bones and bony structures such as mesoethmoid, articular and six suborbitals. Observation on adult specimens are presented too.

  2. Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae to thermal fluctuations Respuesta de preferencia, tolerancia y resistencia de Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae a fluctuaciones térmicas

    Directory of Open Access Journals (Sweden)

    Mónica Hernández-Rodríguez

    2010-01-01

    Full Text Available Poecilia sphenops was acclimated to two thermal fluctuations, each following a symmetrical and asymmetrical cycle. The critical maximum temperatures of the fish were significantly different (P Poecilia sphenops fue aclimatada a dos fluctuaciones térmicas cada una con un ciclo simétrico y asimétrico. La temperatura crítica maxima de los peces fue significativamente diferente (P < 0.001 entre las fluctuaciones y se observó a 40°C en el ciclo 20-29°C; para el ciclo 25-35°C fue mayor a 42°C. Los peces aclimatados a la fluctuación 20-29°C fueron más resistentes al frío con una temperatura crítica mínima de 10°C, en contraste a los 11.7°C del régimen 26-35°C. En ambos ciclos la temperatura letal incipiente superior tuvo un intervalo de 38.8 a 39.5°C y la temperatura letal incipiente inferior fue de 10.8 a 11.8°C. La temperatura preferida de las hembras fue de 30 a 31°C, con excepción del ciclo simétrico 26-35°C. La temperatura preferida de los machos aclimatados al ciclo simétrico fue de 23.8 a 24.2°C y de 27.4 a 29.4°C en el ciclo asimétrico. Las temperaturas de evitación de los machos y las hembras aclimatados a la fluctuación 20-29°C tienen un intervalo de 14 a 16°C comparado con el intervalo de 8.4 all .4°C del tratamiento 26-35°C. Los resultados indican que P. sphenops está perfectamente adaptado a las marcadas estaciones de lluvia y sequía de su habitat.

  3. Relação preliminar das espécies de peixes (Pisces, Elasmobranchii, Actinopterygii ameaçadas no Brasil Preliminary list of endangered fish species (Pisces, Elasmobranchii , Actinopterygii in Brazil

    Directory of Open Access Journals (Sweden)

    Ricardo S Rosa

    1996-01-01

    Full Text Available The Brazilian fish fauna is still poorly known with respect to its diversity and conservation status, particularly of freshwater species. Human activities and population growth are rapidly impacting this fauna to an unchecked extent, so that many fish species are presently threatened. Also, some areas have been so critically altered that their fish fauna can no longer be properly inventoried. There is an urgent need to evaluate the conservation status of Brazilian fish species, since none are presently listed as endangered by federal legislation. Based on a literature search and a survey directed to the Neotropical ichthyologists, we present an unofficial list including a total of 78 threatened fish species (12 elasmobranchs and 66 actinopterygians. Of these, sixteen actinopterygian species are listed as endangered, three elasmobranchs and nine actinopterygians as vulnerable, and seven actinopterygians as rare; 40 species either have indeterminate status or are data deficient to yield an adequate assessment, and three species are listed as extinct or possibly extinct.

  4. Una nueva especie de Opistognathus (Pisces: Perciformes para la Isla de Gorgona (Pacífico Colombiano

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    Acero P. Arturo

    1993-12-01

    Full Text Available A new species of jawfish, Opistognathus tenmutis, is described from the Colombian island of Gorgona in the Pacific Ocean, based on four specimens. The new species differs from others already described from the westem American coast by the following characters: dorsal fin with eleven spines and thirteen rays, anal fin with three spines and thirteen rays, pectoral fin with 20-21 rays, 41-44 gillrakers in the first arch, violet lines as the main body coloratlon with no spots or ocelli; also, its maximum body size is over 27 cm.Se describe una especie nueva de Opistognáthido, Opistognathus fenmutis, a partir de cuatro ejemplares provenientes de la isla colombiana de Gorgona. La nueva especie difiere de las otras descritas de la costa occidental de América por tener once espinas y trece radios en la aleta dorsal, tres espinas y trece radios en la aleta anal, 20-21 radios pectorales, 41-44 branquiespinas en el primer arco, y una coloración basada en líneas violetas, sin manchas ni ocelos dorsales; además crece por encima de los 27 cm.

  5. Morphological biomarkers in Prochilodus lineatus (pisces, prochilodontidae) for environmental impact assessment in the region of the Baixada Maranhense, Brazil

    International Nuclear Information System (INIS)

    Dantas, Janaína Gomes; Andrade, Ticianne de Sousa de Oliveira Mota; Castro, Jonatas da Silva; Sodré, Camilla Fernanda Lima; Carvalho-Neta, Raimunda Nonata Fortes; Junior, Audálio Rebelo Torres

    2015-01-01

    This study aimed to identify the types of histopathological lesions found in gills of Prochilodus lineatus of the Environmental Protection Area of the Baixada Maranhense region (Brazil). Fish were collected in Mearim river. Sampling took place in October, November and December 2014. We have purchased 30 samples of fish from local fishermen. In the laboratory fish gills were removed, and then fixed in 10% formalin solution and kept into alcohol 70% to the usual histological processing. The tissue was performed by light microscopy and findings were photomicrographed in light microscope - ZEIS. The following lesions were identified: epithelial displacement, the marginal channel shift a start vascular congestion, hyperplasia and merging multiple slides; epithelial disruption, edema, vascular congestion, total fusion of lamellae and disorganization of secondary lamellae. These changes express a response of the body to some xenobiontes. Morphological changes in the gills may represent adaptive strategies for conservation of some biological functions when animals are facing changes in the water quality

  6. Arius kesslerl & Sciadeops troschelii (Pisces: Ariidae growth in floating net cages in estuarine waters of Buenventura Bay-Colombia

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    Efraín Alfonso Rubio

    1999-07-01

    Full Text Available Two species of estuary catfish the Arius kessleri (CoCoCo and the Sciadeops troschelii (Nato were held in floating net cages at varying densities in estuarine waters of Buenventura Bay-Colombia. After 120 days for the Cococo had weights of 84.1 g Y64 g with densities of 5 and 30 specimen/rn'. The growth average was 0.58-0.39 g/day; the net yield obtained vary from 0.35 to 1.16 Kg/m', the food conversion ratio vary from 3.3 to 5.0 and de survival rate vary from 86% to 100%. With the Nato we obtained weights of 164 and 184 g, beginning with weights of 41 and 108 g their growth average vary from 0.50 to 0.82 g/day. The net yield obtained vary from 0.58 to 0.75 Kg/m' and the survival rate vary from 83% to 100%. From these results we conclude that the two species of catfish studied are strong species but they do not offer good possibilities for fish farming in estuarine waters.

  7. [Distribution, abundance and population parameters of Diapterus rhombeus (Pisces: Gerreidae) in Laguna de Términos, Campeche, Mexico].

    Science.gov (United States)

    Ayala-Pérez, L A; Gómez-Montes, B A; Miranda, J R

    2001-06-01

    Diapterus rhombeus dominates the nektonic community of Terminos Lagoon and is associated to zones with submerged vegetation, temperatures between 27 and 33 degrees C and salinity between 25 and 36.5 UPS. A total of 3,024 individuals were collected with a trawl net in 23 sites between September 1997 and September 1998. The length-weight model parameters are a = 0.0098; b = 3.155 with a 96% correlation. The growth parameters are L infinity = 20.4 cm, k = 0.74 and t(o) = -4.207 and the total mortality coefficient is 3.526. Fish length is 2.5-18.0 cm with a mode of 7.5 cm. Recruitment is continuous with a peak from May to August. The species uses several habitats of the lagoon mainly for feeding and growth, reproduction probably occurs in the adjacent continental shelf. Movements between continental shelf and the estuarine system represent a continuous energy flow.

  8. Edad y crecimiento de la mojarra Oreochromis aureus (Pisces: Cichlidae) en la Presa Sanalona, Sinaloa, México

    OpenAIRE

    Beltrán-Álvarez, Rigoberto; Sánchez-Palacios, Jesús; Valdez, Guadalupe L; Ortega-Salas, Armando A

    2010-01-01

    Oreochromis aureus es un importante recurso pesquero en el embalse, por lo cual se realizó un estudio sobre su edad y crecimiento desde noviembre del 2006 a septiembre del 2007. Se realizaron muestreos bimensuales con redes agalleras de varios tamaños de luz de malla, y también se colectaron peces de la captura comercial. Se midió la longitud total (Lt), el peso total (Pt), el sexo y la madurez gonádica. La edad se determinó mediante lecturas de marcas de crecimiento en escamas y su validació...

  9. Edad y crecimiento de la mojarra Oreochromis aureus (Pisces: Cichlidae en la Presa Sanalona, Sinaloa, México

    Directory of Open Access Journals (Sweden)

    Rigoberto Beltrán-Álvarez

    2010-03-01

    Full Text Available Oreochromis aureus es un importante recurso pesquero en el embalse, por lo cual se realizó un estudio sobre su edad y crecimiento desde noviembre del 2006 a septiembre del 2007. Se realizaron muestreos bimensuales con redes agalleras de varios tamaños de luz de malla, y también se colectaron peces de la captura comercial. Se midió la longitud total (Lt, el peso total (Pt, el sexo y la madurez gonádica. La edad se determinó mediante lecturas de marcas de crecimiento en escamas y su validación se realizó mediante el índice marginal e índice gonadosomático. Se colectaron 384 peces, las tallas y pesos variaron de 125 a 345mm y de 40 a 671g, respectivamente. El crecimiento en longitud y peso se describe mediante las ecuaciones de von Bertalanffy: Lt = 416 [1-e-0.3682 (t+0.4975] y Pt = 1323[1- e-0.3682(t+0.4975

  10. Culuwiya cichlidorum n. sp. (Digenea: Haploporidae) from the black-belt cichlid Vieja maculicauda (Pisces: Cichlidae) from Nicaragua

    Czech Academy of Sciences Publication Activity Database

    Aguirre-Macedo, M. L.; Scholz, Tomáš

    2005-01-01

    Roč. 91, č. 6 (2005), s. 1379-1384 ISSN 0022-3395 R&D Projects: GA AV ČR IAA6022404 Institutional research plan: CEZ:AV0Z60220518 Keywords : Trematoda * Haploporidae * taxonomy Subject RIV: EG - Zoology Impact factor: 1.524, year: 2005

  11. Comparative age and growth of common snook Centropomus undecimalis (Pisces: Centropomidae from coastal and riverine areas in Southern Mexico

    Directory of Open Access Journals (Sweden)

    Martha A. Perera-Garcia

    2013-06-01

    Full Text Available Common snook Centropomus unidecimalis is an important commercial and fishery species in Southern Mexico, however the high exploitation rates have resulted in a strong reduction of its abundances. Since, the information about its population structure is scarce, the objective of the present research was to determine and compare the age structure in four important fishery sites. For this, age and growth of common snook were determined from specimens collected monthly, from July 2006 to March 2008, from two coastal (Barra Bosque and Barra San Pedro and two riverine (San Pedro and Tres Brazos commercial fishery sites in Tabasco, Mexico. Age was determined using sectioned saggitae otoliths and data analyzed by von Bertalanffy and Levenberg-Marquardt among others. Estimated ages ranged from 2 to 17 years. Monthly patterns of marginal increment formation and the percentage of otoliths with opaque rings on the outer edge demonstrated that a single annulus was formed each year. The von Bertalanffy parameters were calculated for males and females using linear adjustment and the non-linear method of Levenberg-Marquardt. The von Bertalanffy growth equations were FLt=109.21(1-e-0.21(t+0.57 for Barra Bosque, FLt=94.56(1-e-0.27(t+0.48 for Barra San Pedro, FLt=97.15(1-e-0.17(t+1.32 for San Pedro and FLt=83.77(1-e-0.26(t+0.49 for Tres Brazos. According to (Hotelling’s T², p<0.05 test growth was significantly greater for females than for males. Based on the Chen test, von Bertalanffy growth curves were different among the study sites (RSS, p<0.05. Based on the observed differences in growth parameters among sampling sites (coastal and riverine environments future research need to be conducted on migration and population genetics, in order to delineate the stock structure of this population and support management programs.

  12. Reproduction, gonad histology and fecundity of Aidablennius sphynx (Pisces: Blenniidae of the Catalan Sea (North-Western Mediterranean

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    Maite Carrassón

    2003-12-01

    Full Text Available The reproductive biology of the Mediterranean blenny fish Aidablennius sphinx was studied on the basis of microscopic and macroscopic analysis. A. sphynx is a resident species of the shallow waters of this region, lays demersal eggs and provides parental care to the developing embryos. Mature male gonads occur between March and July, whereas mature females appear between April and August. Male gonads are composed of the testis and the testicular gland. Spermatids are released into the testicular gland. The testicular gland is relatively more prominent than the testis after the reproductive season. Six stages of oocyte development (included atretic ones are considered. Seasonal variations of gonads of both males and females are illustrated. Low fecundity was recorded, as the ovaries may contain 432 to 1682 oocytes according to female size. Equations describing the relationship between gonad weight and length and weight of males and females are presented. Equations describing the relationship between absolute individual fecundity and length and weight of females are also presented.

  13. A management plan for the sport fishery of Parachromis dovii (Pisces: Cichlidae (Gunther 1864 in Hule lake, Costa Rica

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    Farid A Tabash B

    2000-06-01

    Full Text Available A first attempt to regulate the fishing activity while preserving the species and its habitats is presented for Hule lake. We intensively sampled the "guapote" between March 1996 and April 1997 using monofilament gill nets and a floating line, collecting 421 individuals. P. dovii biomass was relatively low; this species had a long life cycle (8-10 years and the growth oscillation was low (C=0.3. Maximum life expectation was estimated at 12 years and the point of minimum growth coincided with the spawning that takes place between November and December. After spawning, P. dovii take around seven months to reach recruitment size (54.6 mm. The length of first maturation was 134 mm Lt, which indicates that this species is viable for reproduction soon after leaving the protection zones around the lagoon. "Guapote" sport fishing in the Hule lake is in equilibrium, the renewal rate is 80%. An increment in the actual fishery effort is not recommended, since it could seriously affect the natural renewal capacity of the stock.Un primer intento para regular la actividad de la pesca deportiva para el guapote lagunero, Parachromis dovii mediante los resultados de un programa de evaluación del recurso y del estudio de la dinámica poblacional de esta especie se presenta. La biomasa del guapote es relativamente baja. La especie presenta un ciclo de vida largo (8 a 10 años con una baja oscilación en el crecimiento (C= 0.3, la expectativa de vida máxima estimada fue de 12 años y el punto de mínimo crecimiento coincidió con el período de desove (entre Noviembre y Diciembre. Luego del desove, P. dovii permanece en las áreas protegidas cerca de 7 meses hasta alcanzar la talla de reclutamiento (54.6 mm Lt. La longitud de primera maduración fue de 134 mm Lt, lo que indica que esta especie es apta para reproducirse poco tiempo después de haber abandonado las áreas de protección, ubicadas alrededor de la laguna. También se describen algunos aspectos de su biología. La pesca deportiva del guapote en la laguna Hule mantiene aún a la población en equilibrio, la tasa de renovación natural se estima en 80%, por lo que no se recomienda permitir un incremento en los niveles actuales de esfuerzo pesquero, dado que esto afectaría seriamente la capacidad de renovación natural de P. dovii.

  14. Range expansion of the Mayan cichlid, cichlasoma urophthalmus (pisces, cichlidae), above 28°N in Florida

    Science.gov (United States)

    Paperno, R.; Ruiz-Carus, R.; Krebs, J.M.; McIvor, C.C.

    2008-01-01

    Introduced exotic species are a well-recognized problem in Florida's subtropical ecosystems. The presence of the exotic Mayan cichlid (Cichlasoma urophthalmus) was first confirmed in Florida in 1983, when numerous individuals were found in the northeastern Florida Bay. Since then, this species has continued to expand its range northward. The capture, beginning in October 2004 to present, of large numbers of Mayan cichlids from central Florida's east- and west-coast mangrove systems north of 28°N latitude is documented here. Mayan cichlids in a wide range of sizes (estimated ages 0-7 years) at both east- and west-coast sites were collected. In addition, macroscopic examination of gonads showed the presence of developing eggs. The occurrence of multiple age-classes, maturing individuals, cichlid nests, and juveniles, plus repeated collections over a four-year period, indicates that the Mayan cichlid is successfully reproducing and surviving the average winter temperatures in some estuarine waters in central Florida.

  15. Feeding and trophic ecomorphology of Satanoperca pappaterra (Pisces, Cichlidae in the Manso Reservoir, Mato Grosso State, Brazil

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    Norma Segatti Hahn

    2005-11-01

    Full Text Available The aim of this work was to evaluate the relationship between diet and features of the trophic ecomorphology of Satanoperca pappaterra (Heckel, 1840 in an impacted environment. Samples were collected from March 2000 to February 2003 in Manso Reservoir, Cuiabá River, Mato Grosso State. Analysis of 93 stomachs contents showed that food resources associated with the substrate, such as plant remains, detritus, fish scales and Chironomidae larvae, dominated the diet. Consequently this species was characterized as a detritivorous-invertivorous. However, individuals collected in 2003 showed a greater selection of benthic organisms in relation to previous periods. Morphological structures such as position of the mouth, form of the lips, gill rakers and pharyngeal teeth, in addition to the length of the intestine, showed specializations correlated with the diet. However, as long as the food was associated with the substrate, it seemed to be selected according to its abundance in the environment.O objetivo deste estudo foi descrever e avaliar as relações entre dieta e traços da ecomorfologia trófica de Satanoperca pappaterra (Heckel, 1840 em ambiente impactado. As coletas foram realizadas no reservatório de Manso, MT., entre março/2000 a fevereiro/2003. A análise de 93 estômagos, mostrou que recursos alimentares associados ao substrato, tais como restos vegetais, detritos, escamas e larvas de Chironomidae, predominaram na dieta, caracterizando esta espécie como detritívora-invertívora. Entretanto, indivíduos coletados em 2003 mostraram maior seleção de organismos bentônicos em relação aos períodos anteriores. As estruturas morfológicas, como posição da boca, forma dos lábios, rastros branquiais e dentes faríngeos, além do comprimento do intestino mostram um certo grau de especialização ao tipo de dieta. No entanto, o alimento, desde que associado ao substrato, parece ser selecionado de acordo com sua abundância no ambiente.

  16. External tagging does not affect the feeding behavior of a coral reef fish, Chaetodon vagabundus (Pisces: Chaetodontidae)

    KAUST Repository

    Berumen, Michael L.; Almany, Glenn R.

    2009-01-01

    and cost efficient. However, a key assumption is that neither the tagging procedure nor the presence of a tag negatively affects the individual. While this has been demonstrated for relatively coarse metrics such as growth and survival, few studies have

  17. Distribución de Sicydium Valenciennes 1837 (Pisces: Gobiidae) en México y Centro América

    OpenAIRE

    Lyons, John

    2005-01-01

    Gobies of the genus Sicydium Valenciennes are widespread in Mexico and Central America, but have a different distribution pattern on the Atlantic and Pacific slopes of the region. On the Pacific slope, where mountain ranges are found near the coast and the coastal plain is narrow, Sicydium is continuously distributed in rivers from Mazatlán, Sinaloa, Mexico, to central Panama. On the Atlantic slope, Sicydium is known from to three disjunct areas where coastal mountain ranges are present, cent...

  18. Residuos piscícolas a ensilaje biológico: Evaluación Fisicoquímica

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    Rodrigo Ortega Toro

    2016-03-01

    Full Text Available Una alternativa para estabilizar los subproductos provenientes de piscifactorías es el ensilaje de los residuos y vísceras, los cuales servirán como base para la alimentación de otras especies. Este proceso es amigable con el medio ambiente, seguro, simple tecnológicamente y económico. El objetivo del presente trabajo fue evaluar parámetros fisicoquímicos de residuos de tilapia durante el proceso de fermentación ácido láctica. Se fermentaron matrices de residuos de tilapia roja (Oreochromis spp. inoculadas con bacterias ácido lácticas (BAL de yogur y Lactobacillus plantarum B2. Se usó un diseño factorial de 22 en el que los factores por evaluar fueron la matriz y el inóculo, cada uno con dos niveles. Se evaluaron, así mismo, parámetros fisicoquímicos como, pH, acidez titulable, consumo de azúcares totales y análisis proximal. Se encontró que el proceso fermentativo de ensilado inoculado con L. plantarum B2 presentó mejor comportamiento en cuanto a reducción de pH y producción de acidez titulable. En cuanto al ensilaje obtenido mediante la fermentación con yogur, presenta parámetros de calidad aceptables siendo este inóculo una alternativa viable para llevar a cabo el proceso de fermentación.

  19. Spatial dynamics of the red grouper Epinephelus morio (Pisces: Serranidae on the Campeche Bank, Gulf of Mexico

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    Jorge A. López-Rocha

    2013-06-01

    Full Text Available The spatial dynamics of the red grouper Epinephelus morio plays a fundamental role in the fishery management on the Campeche Bank, where it is overfished. The objective of this study was to characterize the spatial dynamics of this population. We used a dynamic model of spatial distribution to estimate population movement rates between adjacent areas. The model was applied using information on catch per unit effort and length-frequency distributions for the Mexican mid-sized fleet that operated in the area in the period 1973-1977. These data were chosen to ensure that the information would reflect the condition of the resource before overfishing. It was possible to quantify the spatial dynamics of the red grouper and the results were consistent with previously known movement patterns. The results showed different movement rates and temporal patterns of movement for different population sectors. The spawning aggregations and the seasonal upwelling occurring in the eastern part of the Bank were considered as key factors influencing the pattern of population movements.

  20. Occurrence of larvae of Pseudorhombus elevatus Ogilby (Heterosomata-Pisces) along the south-west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    at less than 10 mm standard length The most notable character of middle and late stage larvae is the pronounced elongation of the nine anteriormost dorsal fin rays Adults of P elevatus with mature gonads were subsequently collected from the same region...

  1. A new record of Ratan goby - Ponticola ratan (Nordmann, 1840 (Pisces: Gobiidae in the Black Sea, Romanian coastal waters

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    Daniel Cocan

    2016-11-01

    Full Text Available In August 2015 we managed to capture a specimen of ratan goby (Ponticola ratan in the Romanian coastal waters of the Black Sea, near the locality of Sf. Gheorghe (Tulcea County. This is the 7-th signaling for this species in Romanian coastal waters. The previous 6 specimens were recorded in the period 1960-1993, between Mangalia (Constanţa County and Sulina (Tulcea County. The species was identified by means of meristic characters (number of scales on medial line, number of spiny and soft rays, and morphological particularities (cycloid scales on the nape area and pectoral fin joint. Also, the measurements made, confirmed that the ratio between the head length and total length, which was 33% (TL=8.70 cm vs. Head Length=2.61cm. Another morphological character, specific to this species, is the lower jaw, which exceeds in length the upper jaw. Being a Ponto-Caspian endemite, with low population along the Bulgarian and Romanian coastline, we considered it important to point out this new record. Noting that, being known the trend of sporadic migration of this species, would not be excluded that global warming causes a shift from its normal distribution area, from northern and northeastern (Black Sea to south-west. Therefore, future research may bring more notifications regarding this species in south-western area of the Black Sea

  2. Pressure and pain In Systemic sclerosis/Scleroderma - an evaluation of a simple intervention (PISCES: randomised controlled trial protocol

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    Alcacer-Pitarch Begonya

    2012-02-01

    Full Text Available Abstract Background Foot problems associated with Systemic Sclerosis (SSc/Scleroderma have been reported to be both common and disabling. There are only limited data describing specifically, the mechanical changes occurring in the foot in SSc. A pilot project conducted in preparation for this trial confirmed the previous reports of foot related impairment and reduced foot function in people with SSc and demonstrated a link to mechanical etiologies. To-date there have been no formal studies of interventions directed at the foot problems experienced by people with Systemic Sclerosis. The primary aim of this trial is to evaluate whether foot pain and foot-related health status in people with Systemic Sclerosis can be improved through the provision of a simple pressure-relieving insole. Methods The proposed trial is a pragmatic, multicenter, randomised controlled clinical trial following a completed pilot study. In four participating centres, 140 consenting patients with SSc and plantar foot pain will be randomised to receive either a commercially available pressure relieving and thermally insulating insole, or a sham insole with no cushioning or thermal properties. The primary end point is a reduction in pain measured using the Foot Function Index Pain subscale, 12 weeks after the start of intervention. Participants will complete the primary outcome measure (Foot Function Index pain sub-scale prior to randomisation and at 12 weeks post randomisation. Secondary outcomes include participant reported pain and disability as derived from the Manchester Foot Pain and Disability Questionnaire and plantar pressures with and without the insoles in situ. Discussion This trial protocol proposes a rigorous and potentially significant evaluation of a simple and readily provided therapeutic approach which, if effective, could be of a great benefit for this group of patients. Trial registration number ISRCTN: ISRCTN02824122

  3. Genetic support for the morphological identification of larvae of Myctophidae, Gonostomatidae, Sternoptychidae and Phosichthyidae (Pisces from the western Mediterranean

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    Ainhoa Bernal

    2014-12-01

    Full Text Available Mesopelagic fishes experience an extreme body transformation from larvae to adults. The identification of the larval stages of fishes from the two orders Myctophiformes and Stomiiformes is currently based on the comparison of morphological, pigmentary and meristic characteristics of different developmental stages. However, no molecular evidence to confirm the identity of the larvae of these mesopelagic species is available so far. Since DNA barcoding emerged as an accurate procedure for species discrimination and larval identification, we have used the cytochrome c oxidase 1 or the mitochondrial 12S ribosomal DNA regions to identify larvae and adults of the most frequent and abundant species of myctophiforms (family Myctophidae and stomiiforms (families Gonostomatidae, Sternoptychidae and Phosichthyidae from the Mediterranean Sea. The comparisons of sequences from larval and adult stages corroborated the value of the morphological characters that were used for taxonomic classification. The combination of the sequences obtained in this study and those of related species from GenBank was used to discuss the consistency of monophyletic clades for different genera. Pairwise nucleotide distances were notably higher inter- than intraspecifically, and were useful to discern between congeners such as Cyclothone braueri and C. pygmaea, Hygophum benoiti and H. hygomii, Lampanyctus crocodilus and L. pusillus, and Notoscopelus bolini and N. elongatus.

  4. Osteological development of wild-captured larvae and a juvenile Sebastes koreanus (Pisces, Scorpaenoidei from the Yellow Sea

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    Hyo Jae Yu

    2016-06-01

    Full Text Available Abstract The osteological development in Sebastes koreanus is described and illustrated on the basis of 32 larvae [6.11–11.10 mm body length (BL] and a single juvenile (18.60 mm BL collected from the Yellow Sea. The first-ossified skeletal elements, which are related to feeding, swimming, and respiration, appear in larvae of 6.27 mm BL; these include the jaw bones, palatine, opercular, hyoid arch, and pectoral girdle. All skeletal elements are fully ossified in the juvenile observed in the study. Ossification of the neurocranium started in the frontal, pterotic, and parietal regions at 6.27 mm BL, and then in the parasphenoid and basioccipital regions at 8.17 mm BL. The vertebrae had started to ossify at ~7.17 mm BL, and their ossification was nearly complete at 11.10 mm BL. In the juvenile, although ossification of the pectoral girdle was fully complete, the fusion of the scapula and uppermost radial had not yet occurred. Thus, the scapula and uppermost radial fuse during or after the juvenile stage. The five hypurals in the caudal skeleton were also fused to form three hypural elements. The osteological results are discussed from a functional viewpoint and in terms of the comparative osteological development in related species.

  5. EVALUACIÓN POBLACIONAL DEL STOCK EXPLOTABLE DEL COMPLEJO OPISTHONEMA (PISCES: CLUPEIDAE EN EL GOLFO DE NICOYA, COSTA RICA

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    Luis A. Vega Corrales

    2011-07-01

    Full Text Available El género Opisthonema sustenta la pesquería de sardina en Costa Rica. Esta investigación se orientó hacia la evaluación poblacional del stock explotable de esta pesquería en el Golfo de Nicoya. Las muestras mensuales fueron recolectadas desde junio del 2007 hasta mayo del 2008. Se determinó el patrón de reproducción de O. libertate y se estimaron los parámetros de crecimiento de las curvas en longitud del modelo de von Bertalanffy para O. libertate y O. medirastre. Con base en el índice gonadosomático, O. libertate desova intensamente durante la época más calurosa del año, entre febrero y mayo. La talla de primera madurez (TPM50% fue de 18.68 cm de LT. La ecuación de crecimiento de von Bertalanffy estimada para O. libertate fue: Lt= 25.9 [1–exp–1.03(t+0.13] y para O. medirastre: Lt= 32.0 [1–exp–1.10(t+0.15]. El reclutamiento máximo de la pesquería de O. libertate ocurre entre septiembre y noviembre. Esta especie muestra un índice de explotación (E de 0.65 y O. medirastre de 0.55. Se nota una mejoría en el E comparado con estimaciones anteriores. Se recomienda como medida de manejo para esta pesquería ajustar la época de veda y no incrementar el esfuerzo pesquero. The Opisthonema genus supports the sardine fishery in Costa Rica. This research was directed to population assessment of the exploitable stock of this fishery in the Golfo of Nicoya. Monthly samples were collected since June, 2007 until May, 2008. The reproductive pattern of O. libertate were determined and growth parameters of curves in the length of O. libertate and O. medirastre were estimated using the von Bertalanffy model.. Based on the gonadosomatic index, O. libertate spawn intensively during the hottest time of the year, between February and May. The size at first maturity (SFM50% was 18.68 cm T.L. The growth equation of von Bertalanffy was estimated for O. libertate: Tl= 25.9 [1–exp–1.03(t+0.13] and O. medirastre:  Tl= 32.0 [1–exp–1.10(t+0.15]. The maximum recruitment to the fishery of O. libertate occurs between September and November. This species show an exploitation index (E of 0.65 and O. medirastre have an E value of 0.55. It is note an improvement in the E value, as compared to previous values. It is recommended as management measure to adjust the close season, and to avoid any increment of the fishing effort.

  6. Population connectivity among geographic variants within the Lutjanidae (Pisces of the Mexican Pacific coast through fish scale shape recognition

    Directory of Open Access Journals (Sweden)

    Ana L. Ibáñez

    2012-11-01

    Full Text Available Fish scale shape was used to identify geographic variants among Lutjanidae (Lutjanus argentiventris, L. guttatus and L. peru. Specimens were collected from three different geographic areas, north to south of the tropical Pacific coast of Mexico: Puerto Vallarta (PV, Manzanillo (MA and Caleta de Campos (CC. Configuration of landmark coordinates of fish scales were scaled, translated and rotated using generalized procrustes analysis, followed by principal components analysis of resulting shape coordinates. Principal component scores were submitted to cross-validated discriminant analysis to determine the efficacy of scale landmarks for discrimination by geographic variants. This was done with shape and form (shape plus size. PV and MA were recognized as one population different from the CC sampling area. Using only shape (without size, identification rates predicted geographic variant membership much better than chance (91.3%, 70.6% and 85.4% for L. argentiventris, L. guttatus and L. peru, respectively, and taking size into account, classification is somewhat improved (90.6%, 80.1% and 87.5% for L. argentiventris, L. guttatus and L. peru, respectively. Consistency of the two populations for the three species shows non-fortuitous events. Population discrimination confirmed previous genetic studies that show a zoogeographic barrier between the North Equatorial Current and the California Current. The method is non-destructive, fast and less expensive than genetic analysis, thus allowing screening of many individuals for traceability of fish.

  7. Evaluación de la pesquería de Lutjanus peru (Pisces: Lutjanidae de Guerrero, México

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    Apolinar Santamaría

    1999-09-01

    Full Text Available La pesquería del huachinango Lutjanus peru, que se explota cerca de Acapulco, México, fue evaluada a través de muestreos de los desembarcos y de datos de captura. Se aplicó el paquete de programas Fisat para evaluar los parámetros de crecimiento del modelo de von Bertalanffy (K= 0.1442; to= -0.23; L = 80.8 cm; W = 6.824 Kg y reconstruir la estructura por edades en la población en nueve años de datos de captura. El coeficiente de mortalidad natural M según varios métodos, oscila entre 0.14 y 0.38. El tamaño de cada cohorte a través del tiempo, evaluado con el método de análisis de la población virtual (VPA, estima una población de 5.2*10(6 peces explotados con una biomasa media de 8,454 t. La intensidad de explotación F, oscila entre 0.06 y 1.13 y depende del valor de M que se elija; según esto, se puede concluir que el recurso se encuentra subexplotado si el valor de M es bajo, o bien que se encuentra sobreexplotado si el valor elegido de M es alto. El modelo de rendimiento por recluta señala que hay sobrepesca de reclutas por que gravita sobre animales muy chicos (tc Red snapper (Lutjanus peru fishery was analyzed from landings and catch records. Stock age structure was reconstructed after the parameter values of the von Bertalanffy growth model, the length-weight relationship, ages and the natural mortality coefficient through each of nine years of catch records. The Fisat software package was applied to assess population parameters, whose estimates are, for the von Bertalanffy growth model, K = 0.1442 to 0.38; to = -0.2; L = 87 cm; W = 9.4 Kg , and the natural mortality coefficient (M after several methods (0.14 to 0.38. Cohort size was assessed by the virtual population analysis (VPA, estimating population size in 5.2*10(6 fish with a biomass of 8 454 tonnes. Current fishing mortality F, ranges from 0.06 to 1.13, depending upon the chosen M value; according to this, when the M value used is low, the results suggest that the stock is underexploited, and vice versa. The yield per recruit model applied suggests improvements to the management strategy. The model indicates recruit overfishing because very small fish are the main target (tc < 1, nearly 50 % of fish caught are immature and under one year of age. Optimum yield levels correspond to first catch age of 2 to 3 years and a fishing mortality of F = 0.35, suggesting the need of limiting small fish catch of to a minimum of 2 year old specimens.

  8. Monogenea parasites of Micropogonias furnieri (Desmarest, 1823 (Pisces, Sciaenidae from the littoral of Rio de Janeiro state, Brazil

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    Anna Kohn

    1989-01-01

    Full Text Available From the gills of 100 Micropogonia furnieri (Desmarest, 1823 from Atlantic coast of Rio de Janeiro State, were recovered Macrovalvitrema sinaloense Caballero & Bravo-Hollis, 1955, Pterinotrematoides mexicanum Caballero & Bravo-Hollis, 1955, Rhamnocercus rhmnocercus Monaco, Wood & Mizelle, 1954 and Encotyllabe spari Yamaguti, 1934. M. furnieri represents a new host record for them and a new geographical dsitribution is referred for M. sinaloense, P. mexicanum and R. rhmnocercus.

  9. Aspectos biométricos y reproductivos de Boquichico Prochilodus nigricans Agassiz, 1829 (Pisces: Prochilodontidae en Ucayali, Perú

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    José C. Riofrío Q.

    2013-06-01

    Full Text Available El conocimiento de la biología y pesquería de una especie explotada es esencial para un manejo racional y una producción sostenida. De febrero a diciembre de 1994 se colectó información de una de las especies más importantes por los volúmenes de desembarque en Ucayali, el boquichico (Prochilodus nigricans. Se analizaron aspectos biométricos (relación longitud total - peso total: LTPT y reproductivos (proporción por sexos, época de reproducción, tallas de madurez de esta especie. La relación LT-PT no mostró diferencias significativas entre las regresiones de machos y hembras (análisis de variancias residual F0,05 proponiéndose el empleo de una ecuación conjunta para la especie de la forma PT = 0,0211 LT 2,8592. La proporción sexual total no mostró diferencias significativas (χ 2 0,05 al asumir una relación 1:1. El análisis de la progresión de los estadios de madurez confirma la reproducción durante la temporada de elevación del nivel del río Ucayali (octubre-enero. La talla de madurez calculada para los machos fue de 24,5 cm y para las hembras de 26.1 cm, recomendándose esta última para el manejo de la pesquería.

  10. Distribution of Phoxinus eos, Phoxinus neogaeus, and their asexually-reproducing hybrids (Pisces: Cyprinidae in Algonquin Provincial Park, Ontario.

    Directory of Open Access Journals (Sweden)

    Jonathan A Mee

    Full Text Available Hybrid Phoxinus are one of the few asexually reproducing vertebrates species. The distribution of hybrid Phoxinus among lakes in Algonquin Park, Ontario, was evaluated relative to the distribution of parental species and relative to physiochemical lake characteristics. No association between the distribution of hybrids and the distribution of parental species was found, suggesting that the hybrids can successfully coexist with either parental species. In addition, we found no association between hybrid distribution and the physiochemical characteristics of lakes, suggesting that the hybrids are generalists with respect to the ecological niches available in Algonquin Park. There was a difference between the physiochemical characteristics of lakes with and without the parental species P. neogaeus. The lakes containing P. neogaeus were lower elevation than the lakes containing the other parental species, P. eos. The difference in distribution between the parental species may therefore be due to different dispersal abilities, to later arrival following post-glacial dispersal, or to differences in ecology. These results suggest that asexual reproduction is a successful strategy for hybrid Phoxinus in Algonquin Park because these sperm-dependent asexual hybrids are able to survive and persist regardless of which parental species is present, and regardless of the physiochemical characteristics of their habitat.

  11. Long term diet differences between morphs in trophically polymorphic Percichthys trucha (Pisces : Percichthyidae) populations from the southern Andes

    DEFF Research Database (Denmark)

    Logan, M.S.; Iverson, S.J.; Ruzzante, D.E.

    2000-01-01

    in resource use by two recently described sympatric morphs of Perichthys trucha, a common freshwater fish of the Andean and Patagonian regions of South America. Because dietary fatty acids are often stored in carnivorous animals with little modification after consumption, they can be used to infer information...... that certain fatty acids were correlated with diet as determined by gut content analysis. Consumption of anisopteran larvae was highly correlated with 14:0 in adipose and muscle tissue; and higher levels of longer chain unsaturated fatty acids (i.e. 20 and 22 carbons) were correlated with the presence of fish...... and also amphipods in the diets. Taken together, the results suggest that there are marked differences in the foraging ecology of the two morphs of P. trucha inhabiting southern Andean lakes. (C) 2000 The Linnean Society of London...

  12. Feeding of Eigenmannia trilineata (Pisces, Sternopygidae (Lopez & Castello, 1966, in the upper Paraná River floodplain, Brazil

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    Danielle Peretti

    1999-01-01

    Full Text Available Studies were performed on various aspects related to the feeding of Eigenmannia trilineata in the upper Paraná River floodplain, from June 1993 to July 1994, at four places with different types of bottom and waters speed. A number of 279 fish had its stomachal contents analyzed by occurence and point methods in which it was applied on its frequencies the feeding index. Two hundred an sixty two specimens were utilized to the analysis of the feeding activity that it was based on frequency and middle degree of stomach repletion. For the morfological analyse utilized 12 individuals. It was verified fourteen items on species diet which it was found chiefly Chironomidae (Diptera and detritus. Seasonal, area variations were verified in feeding activity and the participation of constituent items in diet. The results showed that the species presents nightly and benthophagous habits, with morfological characters of the carnivorous species.Os estudos foram realizados sob vários aspectos relacionados à alimentação de Eigenmannia trilineata na planície de inundação do alto rio Paraná, de junho de 1993 a julho de 1994 em quatro locais com diferentes tipos de fundo e velocidade de águas. Um número de 279 peixes tiveram seus estômagos analisados pelos métodos de ocorrência e pontos sendo aplicado sobre suas frequências o índice alimentar. Duzentos e sessenta e dois indivíduos foram utilizados para a análise da atividade alimentar, a qual foi baseada sobre a freqüência e grau de repleção médio dos estômagos. Para a análise morfológica foram utilizados 12 indivíduos. Foi verificado 14 itens na dieta da espécie, encontrando-se principalmente Chironomidae (Diptera e detritos. Variações sazonais e de área foram verificados na atividade alimentar e na participação dos itens constituintes da dieta. Os resultados mostraram que a espécie apresenta hábitos noturno e bentófago, com características morfológicas de espécies carnívoras.

  13. Age, growth and fecundity of the silver mullet, Mugil curema (Pisces: Mugilidae, in coastal areas of Northeastern Venezuela

    Directory of Open Access Journals (Sweden)

    Baumar J Marin E

    2000-06-01

    Full Text Available We studied the fecundity and growth in populations of the silver mullet, Mugil curema, in coastal areas of northeastern Venezuela between March 1992 and July 1993. The average number of ovocytes in gonads of 23-42 cm adults was 54 x 104, and the relative fecundity was 1311 ovocytes g-1 of fish. The size of mature ovocytes did not vary in different portions of the same gonad (p 0.05 or among the adults in three populations studied. The average egg diameter for adults was 426 µm (CI= 4.34. Age of juveniles, collected from the La Restinga Lagoon at about monthly intervals, from counts of growth lines on the otoliths ranged from 50 to 240 days. The relation of age (number of growth lines to standard length follows an exponential growth curve. The growth of juveniles varied seasonally and was greatest during the rainy season (April to August, when temperatures were highest. The time of spawning has probably been adapted so that peak recruitment into the lagoons occurs just prior to the rainy season when conditions for growth are most favorable.

  14. Comparative morphometrics of two populations of Mugil curema (Pisces: Mugilidae on the Atlantic and Mexican Pacific coasts

    Directory of Open Access Journals (Sweden)

    Ana Laura Ibáñez-Aguirre

    2006-03-01

    Full Text Available A population of Mugil curema in the Gulf of Mexico was compared with one in the Pacific Ocean using nine morphometric variables. The allometries of each measurement were estimated in relation to total length. Morphometric variations were analyzed using the normalization of the individuals of each group and two multivariate methods: correspondence analysis, used to explore the information, and discriminant analysis. Results indicated that the diameter of the eye differentiated the populations of both coasts, the Atlantic population showed a larger eye diameter. However, other than this and the body width (which can be strongly influenced by sexual maturation there was no difference between the shapes of both populations. We discuss the larger morphometric variability of the Atlantic population which may be due to the presence of more than one population unlike the Pacific population.

  15. The Mugil curema species complex (Pisces, Mugilidae): a new karyotype for the Pacific white mullet mitochondrial lineage.

    Science.gov (United States)

    Nirchio, Mauro; Oliveira, Claudio; Siccha-Ramirez, Zoila R; de Sene, Viviani F; Sola, Luciana; Milana, Valentina; Rossi, Anna Rita

    2017-01-01

    Recent molecular phylogenetic analyses have shown that the Mugil curema Valenciennes, 1836 species complex includes M. incilis Hancock, 1830, M. thoburni (Jordan & Starks, 1896) and at least four " M. curema " mitochondrial lineages, considered as cryptic species. The cytogenetic data on some representatives of the species complex have shown a high cytogenetic diversity. This research reports the results of cytogenetic and molecular analyses of white mullet collected in Ecuador. The analyzed specimens were molecularly assigned to the Mugil sp. O, the putative cryptic species present in the Pacific Ocean and showed a 2n = 46 karyotype, which is composed of 2 metacentric and 44 subtelocentric/acrocentric chromosomes. This karyotype is different from the one described for M. incilis (2n = 48) and from those of the two western Atlantic lineages Mugil curema (2n = 28), and Mugil margaritae (2n = 24). Data suggest the need for a morphological analysis to assign a species name to this Pacific lineage.

  16. The Mugil curema species complex (Pisces, Mugilidae: a new karyotype for the Pacific white mullet mitochondrial lineage

    Directory of Open Access Journals (Sweden)

    Mauro Nirchio

    2017-04-01

    Full Text Available Recent molecular phylogenetic analyses have shown that the Mugil curema Valenciennes, 1836 species complex includes M. incilis Hancock, 1830, M. thoburni (Jordan & Starks, 1896 and at least four “M. curema” mitochondrial lineages, considered as cryptic species. The cytogenetic data on some representatives of the species complex have shown a high cytogenetic diversity. This research reports the results of cytogenetic and molecular analyses of white mullet collected in Ecuador. The analyzed specimens were molecularly assigned to the Mugil sp. O, the putative cryptic species present in the Pacific Ocean and showed a 2n = 46 karyotype, which is composed of 2 metacentric and 44 subtelocentric/acrocentric chromosomes. This karyotype is different from the one described for M. incilis (2n = 48 and from those of the two western Atlantic lineages Mugil curema (2n = 28, and Mugil margaritae (2n = 24. Data suggest the need for a morphological analysis to assign a species name to this Pacific lineage.

  17. Feeding ecology of Liza ramada (Risso, 1810) (Pisces, Mugilidae) in a south-western estuary of Portugal

    Science.gov (United States)

    Almeida, P. R.

    2003-05-01

    The feeding activity of the Liza ramada population inhabiting the Mira estuary (Portugal) is reduced during the winter and summer months. At the beginning of the spawning migration (i.e. November) an increase in the amount of food ingested was noticed. In the upper estuary, the feeding behaviour is independent of the tidal cycle, although there is some evidence of a daily rhythm in the food consumption rate, with a reduction during the night. No significant correlation was found between the quantity of particulate organic matter and the concentration of microalgae present in the stomach contents, and it seems that the bulk of the organic matter ingested by the thin-lipped grey mullets comes from a different origin than planktonic or benthic microalgae. The L. ramada population showed a positive selection for sediment particles between 55 and 250 μm in diameter. In general, the diet composition of this species showed a low diversity of food items. A total of 52 food items were identified in the stomach contents, the Bacillariophyceae being the dominant group. The genera Melosira and Ciclotella were the most common and abundant food items, although the genera Navicula, Nitzschia and Surirella were also classified as preferential food items. It was found that the volume of ploughed sediment that resulted from the feeding activity of the thin-lipped grey mullets, and the correspondent disturbed area increased exponentially with the length of the fish.

  18. Gamma ionization of Phagicola longa (Trematoda:Heterophyidae) in Mugilidae (pisces) in São Paulo, Brazil

    Science.gov (United States)

    Antunes, S. A.; Wiendl, F. M.; Almeida Dias, E. R.; Arthur, V.; Daniotti, C.

    1993-07-01

    The mullet (Mugilidae) is a fish caught in large quantities in brackish and marine waters of the southern Brazilian coast, which in consequence of its raw consumption as "sashimi", a typical Japanese dish, has led to ten cases of human infection by Phagicola longa in São Paulo, Brazil. The mullet acts as a second intermediate host for the parasite, as in human heterophysiasis in the Near and Far East. In order to control these infections under commercial storage conditions and in raw consumption, the radiolysis of P. longa was studied in three mullet species-the silver mullet ( Mugil curema), the grey mullet ( M. platanus) and the "paratipema" ( Mugil sp.) - subjected to ionization ranging from 1.0 to 10.0 kGy (2.21 kGy/h). It was observed that 1.0 and 2.0 kGy caused a motility decrease in silver mullet parasites from 100% to 15% and 17%, and that doses of 4.0 and 10.0 kGy caused metacercaria inviability. The parasite motility decreased in the grey mullet treated with doses of 2.0, 2.5, 3.0 and 3.5 kGy, from 56% to 31%, 9%, 18% and 5%, respectively, 4.0 kGy tending to be the control dose for P. longa. This dose also controls other metacercaria found in the "parati-pema", without changing the odor, color or appearance of the treated mullet.

  19. Can the name Mugil cephalus (Pisces: Mugilidae) be used for the species occurring in the north western Atlantic?

    Science.gov (United States)

    Pacheco-Almanzar, Eloísa; Simons, James; Espinosa-Pérez, Héctor; Chiappa-Carrara, Xavier; Ibáñez, Ana L

    2016-05-09

    Menezes et al. (2010) show that Mugil cephalus Linnaeus, 1758 is different from Mugil liza Valenciennes 1836, the latter being the mullet found along the Atlantic coast of South America. They also suggest that individuals identified as M. cephalus from the northwest Atlantic could represent a population of M. liza in this region, since they doubt the presence of M. cephalus in waters colder than the ones of the West Indies. In order to clarify the presence of M. cephalus in the northwest Atlantic, this study compares meristic and morphometric measurements of M. cephalus and M. liza from the Gulf of Mexico with those obtained by Menezes et al. (2010) for M. liza from South America and for M. cephalus in the Mediterranean Sea. Results show that there are differences in both morphometric and meristic data between the two species. The morphometric measure that differentiates these species is the distance from the snout to the dorsal fin, which is positioned backwards in M. liza compared with M. cephalus. The body width is consistently greater in M. cephalus than M. liza. The meristic character that discriminates between both species is the number of scales in the longitudinal series that, in M. cephalus, ranges from 38 to 43 while in M. liza between 32 to 39. The information presented in this work confirms the presence of M. cephalus in the Gulf of Mexico and the sympatric presence of M. liza is established, even if its abundance is quite low.

  20. Prevalencia e intensidad parasitaria en Mugil cephalus (Pisces: Mugilidae, del Río Colorado, Baja California, México

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    Martha E Valles-Ríos

    2000-06-01

    Full Text Available La prevalencia e intensidad parasitaria de la lisa cabezona, Mugil cephalus Linnaeus, 1758, fue cuantificada durante un ciclo anual (febrero 1994 a febrero 1995 en la confluencia de los ríos Colorado y Hardy, Baja California, México. Dos especies de parásitos fueron reconocidas: Contracaecum multipapillatum (von Drasche, 1882 (Ascaridida: Anisakidae y Ergasilus versicolor Wilson, 1911 (Poecilostomatoida: Ergasilidae. Las larvas del nematodo C. multipapillatum, representadas por dos estadíos (A y B, exhibieron prevalencias de 30% y 14.5%, respectivamente; mientras que el copépodo E. versicolor, mostró una prevalencia de 72.7%. La intensidad media de C. multipapillatum fue 6.18 y 2.37 parásitos/huésped para los estadíos A y B, respectivamente, y en E. versicolor, ésta fue de 4.01. El número de parásitos (táxones combinados incrementó con la talla del pez (r= 0.22, p= 0.02, pero fue independiente del factor de condición (K LP del huésped.The parasitic prevalence and mean intensity in the striped mullet, Mugil cephalus, was seasonally determined during an annual cycle (February 1994 to February 1995 in the confluence of the Colorado and Hardy rivers, Baja California, México. Two species of parasites were identified, a nematode, Contracaecum multipapillatum (von Drasche, 1882 (Ascaridida: Anisakidae, and a copepod, Ergasilus versicolor Wilson, 1911 (Poecilostomatoida: Ergasilidae. The larvae of C. multipapillatum, which were represented by two size classes (A and B stages, had prevalences of 30% and 14.5%, respectively; while A. versicolor had a prevalence of 72.7%. The mean intensity of C. multipapillatum was 6.18 and 2.37 individuals per infected fish for A and B stages, respectively; and for A. versicolor, it was of 4.01. The number of parasites (taxa combined increased with the size of fish (r= 0.22, p= 0.02, but it was independent of the host’s condition factor (K SL.

  1. Micronucleus frequency and hematologic index in Colossoma macropomum (Pisces, Ariidae) for environmental impact assessment at a protected area in Brazil

    International Nuclear Information System (INIS)

    Sousa, Debora Batista Pinheiro; Neta, Raimunda Nonata Fortes Carvalho

    2014-01-01

    This study used micronucleus assays and erythrocyte indices in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in the Environmental Protection Area at Maracanã, São Luis, Brazil. Fish were sampled from two locations within the protected area, Serena Lagoon and Ambude River, on four occasions. Biometric data (length and weight) and an aliquot of blood were collected from each fish for analysis. Erythrocyte indices including: mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were calculated, and blood samples were examined for micronuclei and nuclear morphological changes. Micronuclei were found in fish from both locations, although the frequency was higher in fish from Ambude River. Nuclear morphological changes were identified only in fish collected from Ambude River. Several nuclear morphological changes were found in erythrocytes stained with Giemsa, including: micronuclei and binucleate nuclei. On average, erythrocyte indices were lower in fish collected from Ambude River than in those from Serena Lagoon. Our results indicate that micronuclei and erythrocyte indices can be used in C. macropomum as indicators of environmental health

  2. Seasonal fluctuation in the distribution of eggs and larvae of flat fishes (Pleuronectiformes - Pisces) in the Cochin Backwater

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    Attempts have been made to correlate the abundance of eggs and larvae of flat fishes belonging to families Cynoglossidae and Soleidae with the hydrographical parameters of the environment, particularly the salinity. The eggs and larvae were found...

  3. Aspectos biometricos del bagre Arius Furthii Steindachner (Pisces Ariidae, colectado en punta Morales, Golfo de Nicoya, Costa Rica

    Directory of Open Access Journals (Sweden)

    Maurizio Protti Quesada

    2016-03-01

    Full Text Available Se analizan estadísticamente algunos parámetros biométricos de 257 ejemplares de Arius furthii (Ariidae, colectados en una zona de playa y otra de manglar en Punta Morales, Puntarenas, Costa Rica. Las colectas se realizaron por medio de “arrastres” con una red tipo “chinchorro”. La talla de los especímenes capturados osciló entre 55 y 276 mm de longitud total y 1,3 a 176 g en peso fresco. El análisis estadístico mostró que la longitud total es la mejor variable para la estimación del peso fresco a través de una ecuación de regresión logarítmica.  Además, se mostró que no existen diferencias significativas en el peso de los Arius furthii colectados en la playa y los colectados en el manglar.

  4. Impact of predation by Ostracion immaculatus (Pisces: Ostraciidae) on the macrofouling community structure in Kanayama Bay, Kii Peninsula (Japan)

    Digital Repository Service at National Institute of Oceanography (India)

    Raveendran, T.V.; Harada, E.

    An investigation on the impact of predation by Ostracion immaculatus on fouling community structure in Kanayama Bay, Kii Peninsula, Japan was undertaken from April 1994 to February 1995. Caging experiments with three size groups of O. immaculatus...

  5. Genetic evidence and new morphometric data as essential tools to identify the Patagonian seahorse Hippocampus patagonicus (Pisces, Syngnathidae).

    Science.gov (United States)

    González, R; Dinghi, P; Corio, C; Medina, A; Maggioni, M; Storero, L; Gosztonyi, A

    2014-02-01

    A genetic study to support morphometric analyses was used to improve the description and validate the Patagonian seahorse Hippocampus patagonicus (Syngnathidae) on the basis of a large number of specimens collected in the type locality (San Antonio Bay, Patagonia, Argentina). DNA sequence data (from the cytochrome b region of the mitochondrial genome) were used to differentiate this species from its relatives cited for the west Atlantic Ocean. Both phylogenetic and genetic distance analyses supported the hypothesis that H. patagonicus is a species clearly differentiated from others, in agreement with morphometric studies. Hippocampus patagonicus can be distinguished from Hippocampus erectus by the combination of the following morphometric characteristics: (1) in both sexes and all sizes of H. patagonicus, the snout length is always less than the postorbital length, whereas the snout length of H. erectus is not shorter than the postorbital length in the largest specimens; (2) in both sexes of H. patagonicus, the trunk length:total length (LTr :LT ) is lower than in H. erectus (in female H. patagonicus: 0·27-0·39, H. erectus: 0·36-0·40 and in male H. patagonicus: 0·24-0·34, H. erectus: 0·33-0·43) and (3) in both sexes, tail length:total length (LTa :LT ) in H. patagonicus is larger than in H. erectus (0·61-0·78 v. 0·54-0·64). © 2014 The Fisheries Society of the British Isles.

  6. Redescription of Houssayela sudobim (Woodland, 1935) (Cestoda: Proteocephalidea), a parasite of Pseudoplatystoma fasciatum (Pisces: Siluriformes) from the River Amazon

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš

    2005-01-01

    Roč. 62, č. 3 (2005), s. 161-169 ISSN 0165-5752 R&D Projects: GA ČR GA524/04/0342; GA ČR GD524/03/H133 Institutional research plan: CEZ:AV0Z60220518 Keywords : Cestoda * morphology * fish Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.786, year: 2005

  7. Growth of the Pacific jack Caranx caninus (Pisces: Carangidae from the coast of Colima, México

    Directory of Open Access Journals (Sweden)

    Elaine Espino Barr

    2008-03-01

    Full Text Available The Pacific jack Caranx caninus is a common species fished by artisanal fishermen off the coast of Colima, México. During 2002, monthly samples of morphometric data and otoliths were taken to determine age and growth. Seven age groups were identified. The highest growth, 14.4 cm, takes place during the first year of life. During the second year, C. caninus grows 11.76 cm; the third year 9.61 cm; the fourth 7.85 cm; the fifth 6.41 cm and sixth year 5.24 cm. The constants of von Bertalanffy´s growth equation were: L∞ = 83.26 cm, W∞ = 18.138 g, K = 0.202, t o = -0.283 and A0.95 = 15 years. Growth curves of other species of the same genus were calculated in order to compare them with the one obtained in the present work. The gonadosomatic index presented higher values during November and May. The periods of more intensive feeding are from August to February. Rev. Biol. Trop. 56 (1: 171-179. Epub 2008 March 31.El jurel Caranx caninus es una especie común que se captura en la pesca artesanal frente a las costas de Colima, México. Mensualmente, durante 2002, se tomaron datos morfométricos y muestras de otolitos para determinar la edad y el crecimiento. Se encontraron siete grupos de edad; durante el primer año de vida se da el mayor crecimiento, hasta 14.4 cm. Durante el segundo año, C. caninus crece 11.76 cm; el tercero 9.61 cm; el cuarto 7.85 cm; el quinto 6.41 cm y el último año crece 5.24 cm. Las constantes de la ecuación de crecimiento de von Bertalanffy fueron: L∞ = 83.26 cm, W∞ = 18.138 g, K = 0.202, to = -0.283 y la longevidad A0.95 = 15 años. Las curvas de crecimiento de otras especies del mismo género se compararon con las obtenidas en el presente trabajo. El índice gonadosomático presentó valores más altos durante noviembre y mayo. Los periodos de tiempo de alimentación más intensa son de agosto a febrero.

  8. Comparative age and growth of common snook Centropomus undecimalis (Pisces: Centropomidae from coastal and riverine areas in Southern Mexico

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    Martha A. Perera-Garcia

    2013-06-01

    Full Text Available Common snook Centropomus unidecimalis is an important commercial and fishery species in Southern Mexico, however the high exploitation rates have resulted in a strong reduction of its abundances. Since, the information about its population structure is scarce, the objective of the present research was to determine and compare the age structure in four important fishery sites. For this, age and growth of common snook were determined from specimens collected monthly, from July 2006 to March 2008, from two coastal (Barra Bosque and Barra San Pedro and two riverine (San Pedro and Tres Brazos commercial fishery sites in Tabasco, Mexico. Age was determined using sectioned saggitae otoliths and data analyzed by von Bertalanffy and Levenberg-Marquardt among others. Estimated ages ranged from 2 to 17 years. Monthly patterns of marginal increment formation and the percentage of otoliths with opaque rings on the outer edge demonstrated that a single annulus was formed each year. The von Bertalanffy parameters were calculated for males and females using linear adjustment and the non-linear method of Levenberg-Marquardt. The von Bertalanffy growth equations were FLt=109.21(1-e-0.21(t+0.57 for Barra Bosque, FLt=94.56(1-e-0.27(t+0.48 for Barra San Pedro, FLt=97.15(1-e-0.17(t+1.32 for San Pedro and FLt=83.77(1-e-0.26(t+0.49 for Tres Brazos. According to (Hotelling’s T², pEl robalo blanco Centropomus undecimalis representa un ingreso monetario significativo y un recurso alimentario para todas las comunidades rurales cercanas a su distribución. Se determinó la edad y crecimiento de esta especie. Los organismos se recolectaron mensualmente en los desembarcos de la pesca artesanal de las cooperativas de mayor contribución en la zona costera (Barra Bosque y San Pedro y ribereña (San Pedro y Tres Brazos entre julio 2006 y marzo 2008. La edad se determinó mediante otolitos seccionados. La edad estimada fue de 2 a 17 años. Mensualmente se estableció la formación anillos opacos y traslúcidos. Para ambas zonas de estudio agrupadas, se validó el retrocálculo por comparación de tres métodos (Fraser-Lee, Dahl-Lea y Whitney-Carlander, se encontraron diferencias significativas (ANCOVA, p<0.05 entre el promedio de la longitud observada y la longitud retrocalculada. Las constantes de la ecuación de von Bertalanffy fueron calculadas para cada sexo y combinados, se empleó el método no lineal de Levenberg-Marquardt’s. La edad estimada para el robalo blanco fue de 2 a 17 años. Se encontraron diferencias significativas en el crecimiento entre sexos (T² Hotelling, p<0.05. Los parámetros de crecimiento para ambos sexos fueron, zona costera: Barra Bosque Lf t=109.21(1-e-0.21(t+0.57, Barra San Pedro Lf t=94.56(1-e-0.27(t+0.48, y para la zona ribereña: San Pedro Lf t=97.15(1-e-0.17(t+1.32 y Tres Brazos Lf t=83.77(1- e-0.26(t+0.49. Se encontraron diferencias significativas en las curvas de crecimiento de von Bertalanffy entre las poblaciones comparadas (RSS, p<0.05.

  9. The occurrence of the Flying Fish, Hirundichthys speculiger (Valenciennes, 1847), in the North Sea (Pisces, Atheriniformes, Exocoetidae)

    NARCIS (Netherlands)

    Boer, P.; Nijssen, H.

    1972-01-01

    The occurrence of a specimen of the Flying Fish Hirundichthys speculiger (Valenciennes, 1847) in the North Sea is recorded. This is the first record of a member of the family Exocoetidae in the coastal waters of the Netherlands. The specimen is illustrated, and its occurrence in the North Sea is

  10. Embriogenesis and larval ontogeny of the "piau-gordura", Leporinus piau (Fowler (Pisces, Anostomidae after induced spawning

    Directory of Open Access Journals (Sweden)

    Fábio Luiz Borçato

    2004-03-01

    Full Text Available Mature males and females of Leporinus piau (Fowler, 1941 were induced to reproduce through a hypophysation process. Extrusion occurred 12 h or 312 hours-degree after the hypophysation, at a water temperature of 26°C. Fertilized eggs were maintained in incubators at 24°C. Embryonic development, was evaluated using every 10 minutes, fresh egg samples which were analyzed under stereoscopic microscope. The larvae were collected at 24-hour intervals for seven days after hatching, fixed in Bouin's fluid and were submitted to routine histological techniques. The eggs of L. piau were slightly gray, non-adhesive and round-shaped. After 1.5 h the embryo was at the 64-blastomere phase and showed a wide yolk region on the vegetative pole. Within 6.25 h, blastopore closure and the end of gastrula was observed. The differentiation of layers occurred after 7.5 h and hatching after 21 h after fertilization at 24°C or 504 hours-degree. During the first three days of the larvae development there was a gradual yolk sac reduction until its complete absorption on the fourth day, indicating the necessity of exogenous feeding. From the fourth to the seventh day, the final development of the heart, gill arches, swimblader, kidney, hepatopancreas, stomach and intestine were observed. The embryonic and larval development of L. piau were similar to other Anastomidae species.Reprodutores de Leporinus piau (Fowler, 1941 foram submetidos à reprodução induzida por hipofisação. A extrusão ocorreu com 312 horas-grau após hipofisação, com temperatura da água a 26ºC. Os ovos, após fertilização, foram mantidos em incubadoras à temperatura de 24ºC. Para acompanhar o desenvolvimento embrionário, coletaram-se amostras de ovos em intervalos de 10 minutos até a eclosão, as quais foram analizadas ao microscópio esteroscópio. As larvas foram coletadas em intervalos de 24 h durante sete dias após a eclosão, fixadas líquido de Bouin e submetidas a técnicas histológicas de rotina. Os ovos de L. piau são esféricos, cinza claro e não adesivos. Após 1,5 h o embrião encontra-se na fase de 64 blastômeros e apresenta vasta região de vitelo (pólo vegetativo. Com 6,25 h observou-se o final da gástrula e o fechamento do blastóporo. A diferenciação dos folhetos foi observada com 7,5 h e a eclosão das larvas ocorreu com 21 h após a fertilização a 24ºC ou 504 horas-grau. Durante os três primeiros dias do desenvolvimento larval observou-se que o saco vitelínico reduziu gradativamente até sua completa reabsorção no quarto dia, indicando necessidade de alimentação exógena das larvas a partir desta fase. Do quarto ao sétimo dias observou-se desenvolvimento final do coração, arcos branquiais, bexiga gasosa, rins, hepatopâncreas, estômago e intestino. O desenvolvimento embrionário e larval de L. piau é similar ao de outras espécies do mesmo gênero.

  11. Analysis by RAPD of the genetic structure of Astyanax altiparanae (Pisces, Characiformes in reservoirs on the Paranapanema River, Brazil

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    Maria Sueli Papa Leuzzi

    2004-01-01

    Full Text Available In this study, the RAPD technique was used to analyze the genetic structure of populations of the fish Astyanax altiparanae (Characidae, Tetragonopterinae living in the lower, middle and upper Paranapanema River, Brazil. The aim was to assess this structure regarding fish handling and conservation programs. The genetic variability (P was found to be 42.64%, 75% and 75% in the low, middle and upper reaches, respectively. The dendrogram of genetic similarity, obtained by comparative analysis of the sets of samples from the three sites, showed the formation of three clusters. All of the genetic parameters used indicate that the population in the lower Paranapanema is genetically different from those in the middle and upper sections. The theta P test shows that the low Paranapanema is highly differentiated from the middle (0.2813 and upper (0.2912 Paranapanema, while the differentiation between the last two is moderate (0.0895. The data obtained in the present work suggest that recolonization and conservation studies should not be focused on the species A. altiparanae as such, but on the conservation units, because they are the genetically differentiated populations.

  12. Biología del pejerrey Odontesthes bonariensis (Pisces, Atherinopsidae de la laguna Los Charos (Córdoba, Argentina

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    Miguel Mancini

    2008-12-01

    Full Text Available El pejerrey Odontesthes bonariensis es la especie más importante de las pesquerías del centro de Argentina. Se estudio la captura por unidad de esfuerzo (CPUE, la condición corporal, el crecimiento y la alimentación de O. bonariensis de la laguna pampeana Los Charos (34º28´S, 64º23´W, 240 ha, ubicada en la provincia de Córdoba. Se realizaron cuatro muestreos estacionales en el periodo 2002-2003. Para la captura de peces se utilizaron redes de arrastre y enmalle. Se capturaron 2862 ejemplares de un rango de talla comprendido entre 38 y 380 mm de longitud estándar (LSt. La CPUE promedio fue de 74,3(±71,0kg/20 hs de tendido de red. La relación LSt-peso presentó diferencias significativas entre épocas del año (P< 0,01. Los índices de condición corporal estuvieron dentro de los límites de referencia de la especie. El crecimiento calculado fue: LSt(t=459,8*[1–exp(-0,3105*(t-0,175]. La relación LSt–Longitud total (LT fue: LT(mm=8,23+LSt*1,14 (n=283; R2=0,99. El zooplancton constituyó un ítem alimenticio secundario en los peces jóvenes. En los ejemplares de 3+ años de vida se observó un marcado canibalismo, situación que explicaría en parte su mejor condición corporal. La laguna Los Charos presenta una elevada producción de O. bonariensis.

  13. Morphological biomarkers in Prochilodus lineatus (pisces, prochilodontidae) for environmental impact assessment in the region of the Baixada Maranhense, Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Dantas, Janaína Gomes [Master Program in Aquatic Resources and Fishery (PPGRAP/UEMA), State University of Maranhão (Brazil); Superintendency of Biodiversity and Protected Areas of the Secretariat of Environment and Natural Resources of Maranhão (SEMA), Brazil janainnadantas@gmail.com (Brazil); Andrade, Ticianne de Sousa de Oliveira Mota; Castro, Jonatas da Silva [Master Program in Aquatic Resources and Fishery (PPGRAP/UEMA), State University of Maranhão (Brazil); Sodré, Camilla Fernanda Lima [Degree in Biological Sciences, State University of Maranhão (Brazil); Carvalho-Neta, Raimunda Nonata Fortes [Department of Chemistry and Biology, State University of Maranhão (Brazil); Junior, Audálio Rebelo Torres [Department of Limnology and Oceanography, Federal University of Maranhão (Brazil)

    2015-12-31

    This study aimed to identify the types of histopathological lesions found in gills of Prochilodus lineatus of the Environmental Protection Area of the Baixada Maranhense region (Brazil). Fish were collected in Mearim river. Sampling took place in October, November and December 2014. We have purchased 30 samples of fish from local fishermen. In the laboratory fish gills were removed, and then fixed in 10% formalin solution and kept into alcohol 70% to the usual histological processing. The tissue was performed by light microscopy and findings were photomicrographed in light microscope - ZEIS. The following lesions were identified: epithelial displacement, the marginal channel shift a start vascular congestion, hyperplasia and merging multiple slides; epithelial disruption, edema, vascular congestion, total fusion of lamellae and disorganization of secondary lamellae. These changes express a response of the body to some xenobiontes. Morphological changes in the gills may represent adaptive strategies for conservation of some biological functions when animals are facing changes in the water quality.

  14. Cultivo primário de células hepáticas de Metynnis roosevelti (Pisces, Teleostei, Characidae

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    Ligia Maria Salvo

    2000-01-01

    Full Text Available A fim de obter culturas celulares e monocamada de células hepáticas do peixe subtropical Metynnis roosevelti, foram comparadas três metodologias: dissociação celular enzimática com tripsina versene 0,25%; utilização do soro fetal bovino; e soro homólogo, obtido por meio da punção da veia caudal, de exemplares adultos da mesma espécie de peixe. O meio de cultura utilizado foi F10-199 acrescido de L-glutamina 2 mM, insulina 10 µg/mL, fibronectina 50 µg/mL; e antibióticos. A dissociação celular enzimática apresentou maior eficiência na adesão e confluência da monocamada celular em comparação a outras metodologias utilizadas.

  15. Zooplankton standing and diversity in the Gulf of Kachchh with special reference to larvae of decapoda and pisces

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Devi, C.B.L.; Nair, V.R.; Ramaiah, Neelam; Gajbhiye, S.N.

    Zooplankton characteristics of the Gulf of Kachchh including the major creek systems of Nakti, Kandla and Hansthal were studied for monsoon, postmonsoon and pre- monsoon periods. Zooplankton collections were made at 7 locations. The area was very...

  16. Occurrence of the lessepsian species Portunus pelagicus (Crustacea and Apogon pharaonis (Pisces in the marine area of Rhodes Island

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    M. CORSINI-FOKA

    2004-06-01

    Full Text Available A large number of Red Sea species are colonizing the eastern Mediterranean Sea via the Suez Canal, mainly following the Anatolian coasts and spreading westwards. Portunus pelagicus is one of the most common Red Sea swimming crabs, first recorded in the Levantine Basin in 1898. Four specimens of P. pelagicus were collected in different marine areas of Rhodes Island from 1991 to 2000, while three specimens of the lessepsian fish Apogon pharaonis, first recorded in the Mediterranean in 1947, were caught during 2002 in the NW coast of Rhodes. The sub-tropical character of the marine area around Rhodes seems to facilitate the propagation of lessepsian species. These migrants have reached the island at different velocity and degree of establishment of their populations. The occurrence of the blue swimmer crab P. pelagicus and of the bullseye cardinal fish A. pharaonis increases the number of the decapod Crustacea and fish species of Red Sea origin observed in Greek waters.

  17. External tagging does not affect the feeding behavior of a coral reef fish, Chaetodon vagabundus (Pisces: Chaetodontidae)

    KAUST Repository

    Berumen, Michael L.

    2009-11-10

    Increasingly, the ability to recognize individual fishes is important for studies of population dynamics, ecology, and behavior. Although a variety of methods exist, external tags remain one of the most widely applied because they are both effective and cost efficient. However, a key assumption is that neither the tagging procedure nor the presence of a tag negatively affects the individual. While this has been demonstrated for relatively coarse metrics such as growth and survival, few studies have examined the impact of tags and tagging on more subtle aspects of behavior. We tagged adult vagabond butterflyfish (Chaetodon vagabundus) occupying a 30-ha insular reef in Kimbe Bay, Papua New Guinea, using a commonly-utilized t-bar anchor tag. We quantified and compared feeding behavior (bite rate), which is sensitive to stress, of tagged and untagged individuals over four separate sampling periods spanning 4 months post-tagging. Bite rates did not differ between tagged and untagged individuals at each sampling period and, combined with additional anecdotal observations of normal pairing behavior and successful reproduction, suggest that tagging did not adversely affect individuals. © Springer Science+Business Media B.V. 2009.

  18. Does hardness of food affect the development of pharyngeal teeth of the black carp, Mylopharyngodon piceus (Pisces: Cyprinidae)?

    DEFF Research Database (Denmark)

    Hung, Nguyen Manh; Ryan, Timothy M.; Stauffer, Jay R.

    2015-01-01

    We investigated whether food type influences development of the pharyngeal crushing apparatus of black carp (Mylopharyngodon piceus, Cyprinidae). Fish fed a hard diet had average standard lengths and weights larger than those fed a soft diet; these observations in part could be related to differe......We investigated whether food type influences development of the pharyngeal crushing apparatus of black carp (Mylopharyngodon piceus, Cyprinidae). Fish fed a hard diet had average standard lengths and weights larger than those fed a soft diet; these observations in part could be related...... to differences in nutritional value of the two food types. The lower pharyngeal bones, which bear molariform teeth were examined using three dimensional computed tomography (CT) scans. After adjusting for differences in the standard length of the fish, the total volume and exterior surface areas...... of the pharyngeal teeth were greater in fish fed hard diets than in those fed soft diets. Total weights of the pharyngeal arches were less in the fish fed a soft diet than in those fed a hard diet. These results indicated that food type affects development of the pharyngeal crushing mill of black carp and therefore...

  19. Estimation of spawning area of Pisodonophis sangjuensis Ji and Kim, 2011 (Pisces: Ophichthidae) based on leptocephali size and distribution

    Science.gov (United States)

    Ji, Hwan-Sung; Hwang, Kangseok; Choi, Jung Hwa; Cha, Hyung-Kee; Kim, Jin-Koo

    2017-06-01

    Pre-metamorphic leptocephali of Pisodonophis sangjuensis ( n = 91, 10.4-90.2 mm in total length, TL) were collected in the East China Sea for the first time. Pre-metamorphic leptocephali of P. sangjuensis, which were identified using mitochondrial DNA cytochrome c oxidase subunit I gene (mtDNA COI), are characterized by various combinations of morphological characters: 8 moderate to pronounced gut loops with the kidney terminating on the 6-7th loops; and 8 subcutaneous pigment patches on the tail just ventral to the notochord. Pisodonophis sangjuensis leptocephali were more numerously collected offshore than inshore around Jeju Island. The smallest leptocephali ( 100.0 mm TL) were collected from around Jeju Island and the southern coast of Korea. Our findings indicate that P. sangjuensis spawns offshore south of Jeju Island that is an area associated with high water temperature, and then the hatched leptocephali are transported to Jeju Island or the southern coast of Korea by the Tsushima Warm Current.

  20. Rearing larvae of dusky grouper, Epinephelus marginatus (Lowe, 1834, (Pisces: Serranidae in a semi-extensive mesocosm

    Directory of Open Access Journals (Sweden)

    Maria Emília Cunha

    2009-10-01

    Full Text Available One of the major obstacles to propagating dusky grouper, Epinephelus marginatus, is the difficulty of rearing the early larvae. We have successfully raised dusky grouper larvae in mesocosms using a mixed diet of endogenous plankton grown in the rearing tank and an exogenous supply of Brachionus plicatilis and Artemia sp. Newly hatched larvae at an initial density of 1.3 ind.l-1 were stocked in partially shaded 3 m3 circular outdoor tanks during the summers of 2007 and 2008. Before introducing newly hatched larvae, the water was left for six days to promote plankton growth. Larval growth occurred at two different rates: i a faster rate from first feeding to the beginning of metamorphosis, and ii a slower rate at transformation. Survival at the beginning of metamorphosis was less than 10% (33 DPH in 2007 and between 25 and 50% (25 DPH in 2008. High mortalities were observed during larval transformation. The estimated minimum food requirement per grouper larvae increased more than 300% from the beginning of the notochord flexion to the beginning of metamorphosis. To meet such a high feeding requirement the number of larger prey organisms/copepods in the mesocosm should be eight times higher during this time period.

  1. Larvicultura de Rhamdia quelen (Pisces, Pimelodidae con proteína vegetal y animal, suplementadas con plancton

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    Germán Castañeda A.

    2011-12-01

    Full Text Available Objetivo. Determinar el efecto de dietas con diferentes proporciones de fuentes proteicas animales y vegetales suplementadas con plancton sobre el crecimiento y sobrevivencia en larvas de Rhamdia quelen. Materiales y métodos. Fueron formuladas dos dietas experimentales, dieta-1 con 70% de proteína de origen vegetal (torta de soya y dieta-2 con 70% de proteína proveniente de animales (corazón bovino yharina de pescado; se utilizaron cuatro protocolos de alimentación (cinco réplicas por tratamiento: dieta-1 + plancton filtrado en tamiz de 50-200 micras (T1, dieta-2 + plancton filtrado en tamiz de 50-200 micras (T2, dieta-1 (T3, dieta-2 (T4. Las larvas fueron manejadas a una densidad de 20 animales L-1 suministrando alimentohasta aparente saciedad diariamente a las 07:00, 11:00, 16:00 y 21:00 horas; la suplementación con plancton se realizó a las 11:00 y 21:00 horas. Resultados. Entre T1 y T2 no se observaron diferencias estadísticas (p>0.05 en peso final (21.89 ± 15.17mg vs 20.37 ± 10.37mg, longitud total (13.41±2.34mm vs 13.39±1.99 mm, factor de condición (K (0.80±0.13 vs 0.78±0.13 y sobrevivencia (46.6±2.68% vs36.0±7.41%; las diferencias entre T3 y T4 tampoco fueron significativas (3.35±1.40 mg vs 2.98±1.48 mg; 7.54±0.91mm vs 7.33±0.96mm; 0.75±0.13 vs 0.71±0.12; 33.6±9.07% vs 24.8±6.76%, respectivamente; hubo diferencias significativas (p<0.05 entre los grupos suplementados con plancton y los alimentados solo con ración. Conclusiones. La suplementación con plancton fue más efectiva que elofrecimiento solo de ración. La inclusión del 62.9% de torta de soya en la formulación (T1, aparentemente no afectó el crecimiento ni la sobrevivencia.

  2. Pisces, Anguilliformes, Moringuidae, Moringua edwardsi (Jordan and Bollman, 1889: First record in Atol das Rocas, northeastern Brazil

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    Paiva, C. C.

    2010-01-01

    Full Text Available Moringua edwardsi is recorded for the first time at Atol das Rocas, northeastern Brazil. Previous records of thespecies were located in the western Atlantic Ocean, from Florida to southeastern Brazil, but with many gaps between theseregions. A single specimen was collected in Atol das Rocas in July 2007 and it is deposited in the Dias da Rocha IchthyologicalCollection. The new record of M. edwardsi fills a geographic distribution gap of this species and complements the inventoryof fish species inhabiting one of the most unique marine protected areas in the world.

  3. Anatomical adaptations of the buccopharyngeal cavity of Leporinus macrocephalus Garavello & Britski, 1988 (Pisces, Characiformes, Anostomidae in relation of alimentary habit

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    Eliane Menin

    2006-03-01

    Full Text Available The aim of this work was to describe the anatomical adaptations of the buccopharyngeal cavity of Leporinus macrocephalus, a fish species of the family Anostomidae, since this cavity presents structural characteristics intimately related with the alimentary habit. Twenty specimens of Leporinus macrocephalus were used, with length-patterns between 22 and 28 cm, supplied by the Station of Hydrobiology and Fish Farming of the Federal University of Viçosa. The results showed that Leporinus macrocephalus presents anatomical adaptations to the omnivorous alimentary habit, such as: a terminal mouth and small oral rift; thick, flexible inferior lips and with papillas, aiding the capture of the prey; an oral mucous membrane which is practically flat, allowing a fast disobstruction of the oral cavity; the presence of papillas in the pharyngeal mucous membrane, facilitating the movement of alimentary particles to the esophagus or aiding the apprehension of the prey; a buccopharyngeal cavity which is relatively large, allowing the passage of whole prey; incisiviform oral teeth that, with the aid of the adjacent oval papilla, accomplish the apprehension of the prey and pre-cardic preparation of vegetable food; unciform pharyngeal teeth, responsible for the apprehension and maceration of the soft-bodied prey; numerous short gill-rackers, present in all the faces of the branchial arches, some of which are inserted inside others to form a filter that prevents the loss of alimentary particles through the branchial rifts and protects the branchial filaments from possible lesions.

  4. Leporinus trimaculatus, a new species from Amazonia, Brazil, and redescription of the sympatric Leporinus aripuanaensis (Pisces, Characiformes, Anostomidae)

    NARCIS (Netherlands)

    Garavello, Julio Cesar; Santos, dos Geraldo Mendes

    1992-01-01

    Leporinus trimaculatus n.sp. is described, and Leporinus aripuanaensis Garavello & Santos, 1981 is redescribed, both from the Aripuanã river basin, Mato Grosso state, Amazonia, Brazil. A colour pattern of two, three or more dark brown blotches on the lateral sides of the body in both species

  5. Review of the South American characiform fish genus Chilodus, with description of a new species, C. gracilis (Pisces, Characiformes, Chilodontidae)

    NARCIS (Netherlands)

    Isbrücker, I.J.H.; Nijssen, H.

    1988-01-01

    Examination of 291 specimens of Chilodus, a genus of South American fresh water fishes, yielded the presence of three species, viz.: C. punctatus, C. zunevei, and C. gracilis. Of the first species the lectotype is designated. The type material of C. zunevei is lost; new material enabled a

  6. Reexamination of the holotype of Pseuderythrinus rosapinnis Hoedeman, 1950, a synonym of Hoplerythrinus unitaeniatus Agassiz, 1829 (Pisces, Characiformes, Erythrinidae)

    NARCIS (Netherlands)

    Jongh, de Bas O.

    1991-01-01

    The holotype and only known specimen of Pseuderythrinus rosapinnis Hoedeman, 1950 from Surinam is reexamined for the dentition of its palatal arch. Its morphometric and meristic data are compared with four species of erythrinids from the Guianas. Pseuderythrinus rosapinnis turns out to be a synonym

  7. A new species of the Anostomid genus Leporinus Spix from Suriname, with redescriptions of two related species (Pisces, Characiformes, Anostomidae)

    NARCIS (Netherlands)

    Garavello, Julio Cesar

    1990-01-01

    Leporinus nijsseni, an anostomid fish species new to science, is described from Suriname. New diagnoses and descriptions are provided for Leporinus granti Eigenmann, 1912 and Leporinus gomesi Garavello & Santos, 1981 from the Aripuanã river basin, state of Mato Grosso, Brazil. The three species are

  8. Three new species of the characid genus Cynopotamus Valenciennes, 1849, with remarks on the remaining species (Pisces, Characiformes)

    NARCIS (Netherlands)

    Menezes, Naercio A.

    1987-01-01

    Three new species of Cynopotamus Valenciennes, 1849 are described, C. gouldingi n. sp., C. juruenae n. sp. and C. tocantinensis n. sp. New diagnoses and synonymies are provided for most species of this genus as a consequence of the results from a study of recently collected specimens. A revised key

  9. Micronucleus frequency and hematologic index in Colossoma macropomum (Pisces, Ariidae) for environmental impact assessment at a protected area in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, Debora Batista Pinheiro, E-mail: deborabpsousa@gmail.com [Postgraduate Program of Aquatic Resources and Fishery (PPGRAP/UEMA), State University of Maranhão (Brazil); Neta, Raimunda Nonata Fortes Carvalho [Department of Chemistry and Biology, State University of Maranhão (Brazil)

    2014-10-06

    This study used micronucleus assays and erythrocyte indices in the freshwater fish tambaqui, Colossoma macropomum, to assess environmental impacts in the Environmental Protection Area at Maracanã, São Luis, Brazil. Fish were sampled from two locations within the protected area, Serena Lagoon and Ambude River, on four occasions. Biometric data (length and weight) and an aliquot of blood were collected from each fish for analysis. Erythrocyte indices including: mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration were calculated, and blood samples were examined for micronuclei and nuclear morphological changes. Micronuclei were found in fish from both locations, although the frequency was higher in fish from Ambude River. Nuclear morphological changes were identified only in fish collected from Ambude River. Several nuclear morphological changes were found in erythrocytes stained with Giemsa, including: micronuclei and binucleate nuclei. On average, erythrocyte indices were lower in fish collected from Ambude River than in those from Serena Lagoon. Our results indicate that micronuclei and erythrocyte indices can be used in C. macropomum as indicators of environmental health.

  10. Helminth parasites of the oceanic horse mackerel Trachurus picturatus Bowdich 1825 (Pisces: Carangidae) from Madeira Island, Atlantic Ocean, Portugal.

    Science.gov (United States)

    Costa, G; Melo-Moreira, E; Pinheiro de Carvalho, M A A

    2012-09-01

    The helminth parasite fauna of the oceanic horse mackerel Trachurus picturatus Bowdich 1825, caught off the Madeira Islands was composed of six different taxa. Prevalence and abundance of larval Anisakis sp. (Nematoda: Anisakidae) and Nybelinia lingualis (Trypanorhyncha: Tentaculariidae), the most common parasite taxa, were 24.3%, 0.9 and 37.9%, 0.7, respectively. Bolbosoma vasculosum (Acanthocephala: Polymorphidae) and the monogeneans Heteraxinoides atlanticus (Monogenea: Heteraxinidae) and Pseudaxine trachuri (Monogenea: Gastrocotylidae) were comparatively rare. The depauperate helminth fauna of the oceanic horse mackerel at Madeira compared to other geographical regions of the north-eastern Atlantic, namely the Azores banks and the West African coast, may be attributed to the paucity of nutrients off oceanic islands and to a low density of the fish population.

  11. [Feeding habits of Lutjanus guttatus (Pisces: Lutjanidae) at Los Cóbanos and Puerto La Libertad, El Salvador].

    Science.gov (United States)

    Rodrigo Rojas, José; Maravilla, Erick; Chicas, Francisco

    2004-03-01

    Abstract: A total of 175 spotted snapper Lutjanus guttatus were collected monthly in the Los Cobanos and Puerto La Libertad, El Salvador, from January to December 2000 to determine its feeding habits. The fishes studied ranged 9.8 - 58.0 cm in total length. Were collected using push-net and hook and line. This snapper is a bentonic opportunistic carnivorous predator. The total biomass of the stomach contents was 260.5 g. Crustaceans (Squillidae, Portunidae, Dynomenidae. Penaeidae, Sicyoniidae, Callianassidae), were the most abundant group: they accounted for 50.4% of the total biomass. Numerically, Portunus asper was the most abundant prey. Ontogenic differences were observed in the diet. In juveniles (16 cm TL). at any time of the year, the most frequent and abundant components were crustaceans and in adults were crustaceans, fishes and mollusks. The relative importance of different components of the diet was assessed with two indexes that combine. in different ways. percentage frequency of occurrence, percentage number and percentage weight of prey categories. The commercial use this resource and the absence of management strategies are discussed.

  12. Dinámica poblacional de Opisthonema medirastre (Pisces: Clupeidae en la Costa Pacífica de Costa Rica.

    Directory of Open Access Journals (Sweden)

    Rosa Lidia Soto Rojas

    2016-03-01

    Full Text Available Se analizaron la curva de crecimiento y la talla de la primera madurez  de la sardina Opisthonema medirastre en el Golfo de Nicoya. Los resultados muestran que esta especie presenta una L∞ de 30,6 cm para las hembras y de 28,0 cm para los machos. Los valores de la tasa de crecimiento (K fueron bajos en concordancia con lo esperado para especies de vida corta. La talla de primera madurez de esta especie es de 17,0 cm.

  13. Hábitos alimentarios de Lutjanus peru (Pisces: Lutjanidae en las costas de Guerrero, México

    Directory of Open Access Journals (Sweden)

    Apolinar Santamaría Miranda

    2003-06-01

    Full Text Available En este artículo se describen los hábitos alimentarios del huachinango del Pacífico Lutjanus peru en la costa sur del estado de Guerrero, México. Estos datos son importantes para el manejo de las pesquerías locales. A partir de capturas comerciales, se recolectaron 385 estómagos llenos (206 de hembras y 179 de machos en total, mensualmente, durante 1993 y 1994. El contenido estomacal se identificó hasta el nivel de especie cuando fue posible. Los elementos alimentarios se agruparon taxonómicamente, y se cuantificaron, se pesaron y se obtuvo la frecuencia de aparición. Se calculó el índice de importancia relativa (IIR del total de la muestra, por meses, por sexos y tallas. Se obtuvieron 42 elementos alimentarios en total, en 1993, y 43 en 1994. En 1993 La dieta estuvo constituida por peces, crustáceos y moluscos. El agrupamiento de las especies, géneros o familias presa produjo 14 grupos alimentarios, de la siguiente forma: Moluscos, Anfípodos, Copépodos, Estomatópodos, Penaeus vannamei, Larvas de braquiuros, Larvas de estomatópodos, Larvas de la familia Albuneidae, Otros crustáceos, Anchoa ischana, Anchoa lucida, Otros peces, Salpas, Moni. Anchoa ischana dominó el espectro trófico ambos años. Pero, los Anfípodos, Anchoa lucida y Otros peces tuvieron índices importantes en 1994. Existió una gran variabilidad en la composición de la dieta de cada mes. Sin embargo, los crustáceos en conjunto dominaron la dieta de febrero a agosto de 1993. En 1994, los crustáceos sólo fueron dominantes en marzo y agosto. No se encontraron diferencias en la dieta de peces inmaduros, machos y hembras. La dieta del huachinango del Pacífico varía con el crecimiento, aunque siempre se encuentran los mismos grupos de alimento. En la fase adulta, en clases de longitud mayores a 261 mm LF, existe un cierto grado de especialización, ya que consumen más peces, principalmente engráulidos.In this paper we describe the feeding habits of the Red snapper (Lutjanus peru in the southern coast of Guerrero state, Mexico. This data could be relevant to local fisheries management. In total 385 full stomachs (206 from females and 179 from males were collected monthly in 1993 and 1994, from commercial catches. Stomach contents were identified to species level when possible. Food items were grouped into taxonomically coherent groups, and their numbers, weight and frequency of occurrence obtained. The index of relative importance (IRI was calculated for the total sample, by month, sex and size class. In 1993, a total of 42 different food items were obtained, and 43 in 1994. Food items consisted of fishes, crustaceans, and mollusks. The grouping of prey species, genera, or families rendered 14 food groups, as follows: Mollusks, Amphipods, Copepods, Stomatopods, Penaeus vannamei, Brachiuran Larvae, Stomatopods Larvae, Family Albuneidae Larvae, Other crustaceans, Anchoa ischana, Anchoa lucida, Other fishes, Salps and Unidentified organic matter. Anchoa ischana dominated the trophic spectrum in both years. Although, Amphipods, Anchoa lucida and Other fishes had important indexes in 1994. There was high variability in the diet composition by month. Nevertheless, in 1993, from February to August, crustaceans as a whole dominated the diet. In 1994, crustaceans only dominated in March and August. No differences in food habits were found between immature fish, males and females. The diet of the Red snapper varies as they grow, although the same food groups are found always. At the adult phase, in length classes over 261 mm FL, there is some degree of specialization, as they consume more fish, particularly engraulids.

  14. Aislamiento de Saprolegnia sp. (Fungi: Saprolegniaceae de Onchorhyncus mykiss (Pisces: Salmonidae “trucha arco iris” en cutiverio

    Directory of Open Access Journals (Sweden)

    Libertad Alzamora

    2014-06-01

    Full Text Available El objetivo del estudio fue demostrar el origen infeccioso de la mortandad de alevinos y de las lesiones presentadas en adultos de Oncorhynchus mykiss Walbaum 1792, "trucha arco iris", en la piscigranja "El Ingenio», empleando una metodología simple y efectiva. Se colectaron alevinos, ovas, adultos y muestras de agua de las pozas de alevinos. Las muestras se cultivaron sobre semillas de Cucurbita maxima ‘zapallo’, como sustrato, evidenciándose colonias típicas a los siete días. Las características microscópicas de las hilas correspondieron al patrón gráfico de Saprolegnia sp., lo que concuerda con la sintomatología observada en los adultos capturados. La presencia de este patógeno estaría relacionada con la elevada mortandad registrada en los alevinos (40%, probablemente por la importación de las ovas infectadas con el hongo. El método fue electivo, porque el sustrato empleado, favoreció el crecimiento del hongo, y es de fácil aplicación y bajo costo.

  15. Anatomia Funcional e Morfometria do Intestino no Teleostei (Pisces de Água Doce Surubim (Pseudoplatystoma coruscans - Agassiz, 1829

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    Seixas Filho José Teixeira de

    2001-01-01

    Full Text Available Os objetivos do presente trabalho foram estudar a anatomia funcional e a morfometria comparativas nos intestinos médio e no reto, do peixe Teleostei, surubim, Pseudoplatystoma coruscans (Agassiz, 1829 (Siluriformes, Siluroidei, Pimelodidae, de hábito alimentar carnívoro, em duas classes de tamanho, visando fornecer referência à nutrição para o ajuste de diferentes sistemas de alimentação artificial para essa espécie nativa. Por meio destes estudos concluiu-se que o intestino do surubim, sob o ponto de vista morfológico, deve ser denominado, de intestino médio e reto, devido a presença da valva ileorretal e da invaginação valvar intestinal entre esses segmentos. Em relação ao padrão de enrolamento do intestino, apesar do plano geral do intestino médio e do reto ter sido mantido, as alças do intestino médio apresentaram arranjo indefinido, não tendo sido determinado um arranjo-padrão para a espécie. O arranjo intestinal é compatível ao da maioria de peixes carnívoros, ou predominantemente carnívoro, uma vez que seu intestino é quase retilíneo; contudo, as circunvoluções das alças finais do intestino médio talvez possam ser vistas como adaptações a um possível regime onívoro, preferencialmente carnívoro. As pregas intestinais encontram-se mais complexas e desenvolvidas no intestino dos exemplares da segunda classe de tamanho. Procurando estabelecer relações entre o arranjo das pregas das mucosas e a velocidade de transporte do alimento no intestino médio da espécie estudada, sugere-se que o padrão longitudinal, com numerosas anastomoses retardam o avanço do alimento em sentido aboral, o que possibilita maior período digestivo e, conseqüentemente, maior aproveitamento dos nutrientes, pela exposição do material alimentar à mucosa intestinal por período maior, além de contribuir para a preparação do bolo fecal. As pregas da mucosa próxima ao ânus têm direção longitudinal, sugerindo auxílio na expulsão dos bolos fecais, direcionando-os para o meio exterior.

  16. Stocked exotic predators and their interaction with native galaxiids (Pisces: Galaxiidae) shape the food web structure in Tasmanian lakes

    DEFF Research Database (Denmark)

    Vidal, Nicolas; Amsinck, Susanne Lildal; Barmuta, Leon

    2015-01-01

    maximum body size, but not of cladocerans. The zooplankton community food web was wider in lakes with lower pelagic contribution to the fish diet. Our results suggest a negative effect by exotic predators on the niche width of galaxiids, but weak cascading effects on phytoplankton biomass, and a negative...

  17. DESCRIPCIÓN MORFOLÓGICA DEL TUBO DIGESTIVO DE JUVENILES DE RUBIO Salminus affinis (PISCES: CHARACIDAE

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    VJ Atencio

    2008-09-01

    Full Text Available El objetivo del estudio fue la descripción del tubo digestivo de juveniles de Rubio Salminus affinis. Se analizaron cinco juveniles con 23,6±2,6 cm de longitud total y 142,8±62,5 g de peso. Se realizó descripción topográfica y morfológica de los órganos y cortes histológicos con tinción H-E. El esófago es un órgano tubular corto de pared gruesa que representa el 7,8% de la longitud total del tubo digestivo, presenta pliegues internos que ofrecen gran capacidad de distensión permitiendo el paso de presas de gran tamaño. El estómago es una bolsa asimétrica en forma de “Y”, grande y musculosa, amplio en la porción anterior y estrecho hacia el fondo; el número de ciegos pilóricos varió entre 13 y 23 pudiendo ser monotubulares y ramificados. El intestino, con tres asas, se extiende desde el esfínter pilórico hasta el ano. Histológicamente el tubo digestivo está formado por cuatro capas: mucosa, submucosa, muscular y serosa; el epitelio de revestimiento del esófago es estratificado plano no queratinizado con células caliciformes, cambiando a simple cilíndrico mucosecretor llegando al estómago; en el estómago se encuentra epitelio simple cilíndrico mucosecretor y los ciegos pilóricos e intestino son revestidos por epitelio simple cilíndrico con células caliciformes. Tanto el valor promedio del coeficiente intestinal (0,58, como la pared distensible del estómago sugieren que el Rubio tiene un tubo digestivo propio de carnívoro y sus características histológicas presentan similitud con la mayoría de vertebrados superiores.

  18. Hybrid male sterility between the fresh- and brackish-water types of ninespine stickleback Pungitius pungitius (Pisces, Gasterosteidae).

    Science.gov (United States)

    Takahashi, Hiroshi; Nagai, Terumi; Goto, Akira

    2005-01-01

    Two ecologically distinct forms, fresh- and brackish-water types, of ninespine stickleback co-exist in several freshwater systems on the coast of eastern Hokkaido. Recent genetic analyses of 13 allozyme loci revealed genetic separation between the two types even though their spawning grounds were in close proximity. On the other hand, there is only a small difference in mitochondrial DNA (mtDNA) sequence between the two types suggesting that they diverged quite recently or that mtDNA introgression occurred between them. To test for postzygotic reproductive isolating mechanisms and hybrid mediated gene flow, we examined the viability and reproductive performance of reciprocal F1 hybrids. The hybrids grew to the adult size normally and both sexes expressed secondary sexual characters in the reciprocal crosses. The female hybrids were reciprocally fertile, while the male hybrids were reciprocally sterile. Histological and flow-cytometric analyses of the hybrid testis revealed that the sterility pattern was classified as 'gametic sterility,' with gonads of normal size but abnormal spermatogenesis. To our knowledge, the present finding is a novel example of one sex hybrid sterility in the stickleback family (Gasterosteidae).

  19. Redescription of Proteocephalus sulcatus (Klaptocz, 1906) (Cestoda: Proteocephalidea), a poorly known parasite of Clarotes laticeps (Pisces: Siluriformes) in the Sudan

    Czech Academy of Sciences Publication Activity Database

    de Chambrier, A.; Scholz, Tomáš; Beletew, M.; Mahmoud, Z. N.

    2007-01-01

    Roč. 114, č. 4 (2007), s. 693-702 ISSN 0035-418X R&D Projects: GA MŠk LC522; GA ČR GA524/04/0342 Institutional research plan: CEZ:AV0Z60220518 Keywords : Proteocephalus * Cestoda * Proteocephalidae * catfish parasite * Clarotes laticeps * Africa * taxonomy Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 0.376, year: 2007

  20. Seasonal patterns in metazoan parasite community of the "Fat Sleeper" Dormitator latifrons (Pisces: Eleotridae from Tres Palos Lagoon, Guerrero, Mexico

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    Juan Violante-González

    2008-09-01

    Full Text Available Dormitator is among the most important fish genera in the Mexican Pacific coastal lagoon systems. In Tres Palos Lagoon, the Fat Sleeper Dormitator latifrons is one of the most significant species based on catch volume, although it is only consumed locally. Very little information exists on this species’ parasitofauna. Composition and temporal variation in the metazoan parasite community structure of Dormitator latifrons from Tres Palos Lagoon (99º47’ W, 16º48’ N, Guerrero, Mexico, were determined using seasonal samples taken between April 2000 and June 2002. Ten parasite species (55 817 individuals were recovered from 219 examined hosts. These species included eight helminths (Ascocotyle (Phagicola longa, Echinochasmus leopoldinae, Clinostomum complanatum, Pseudoacanthostomum panamense, Saccocoelioides lamothei, Parvitaenia cochlearii, Contracaecum sp. and Neoechinorhynchus golvani and two crustaceans (Argulus sp. and Ergasilus sp.. Five of the helminth species exhibited seasonal variation in their infection dynamics associated with environmental changes during the dry and rainy seasons. The variations in the infection dynamics generated changes in the community structure over time. Rev. Biol. Trop. 56 (3: 1419-1427. Epub 2008 September 30.Entre abril del 2000 y junio del 2002 se efectuó un estudio para determinar la composición y la variación temporal en la estructura de la comunidad de parásitos metazoarios del popoyote Dormitator latifrons en la laguna de Tres Palos, Guerrero, México, a partir de muestras temporales. Se recuperaron diez especies de parásitos (55 817 individuos de 219 hospederos examinados. Estas especies incluyeron ocho helmintos (Ascocotyle (Phagicola longa, Echinochasmus leopoldinae, Clinostomum complanatum, Pseudoacanthostomum panamense, Saccocoelioides lamothei, Parvitaenia cochlearii, Contracaecum sp. y Neoechinorhynchus golvani y dos crustáceos (Argulus sp. y Ergasilus sp.. Cinco de las especies de helmintos registraron variación temporal en su dinámica de infección, la cual fue asociada con cambios ambientales durante las estaciones de secas y lluvias. Las variaciones en la dinámica de infección de estas especies generaron cambios en la estructura de la comunidad a lo largo del tiempo.

  1. Nonrandom variation in Poecilia marcellinoi n. sp. and P. salvatoris Regan, 1907 in El Salvador (Pisces, Poeciliidae)

    NARCIS (Netherlands)

    Poeser, Frederick N.

    1995-01-01

    A new species of the genus Poecilia Bloch & Schneider, 1801 is recorded from El Salvador. Morphological and meristic data of P. marcellinoi n. sp. and of the sympatric P. salvatoris Regan, 1907 are analysed. Intra- and interspecific variation are compared and correlated with environmental and

  2. Two new species and one new subspecies of the South American catfish genus Corydoras (Pisces, Siluriformes, Callichthyidae)

    NARCIS (Netherlands)

    Nijssen, H.

    1971-01-01

    This paper contains descriptions and figures of two new species of Corydoras Lacépède, 1803, C. weitzmani from Peru, and C. blochi from Guyana, Brazil, and Venezuela. The latter species is represented by two subspecies, C. blochi blochi from the Amazonas, Branco, Orinoco, and Essequibo drainages,

  3. Pseudocapillaria (Ichthyocapillaria) ophisterni sp. n. (Nematoda : Capillariidae) from the swamp-eel Ophisternon aenigmaticum (Pisces) in Mexico.

    Science.gov (United States)

    Moravec, F; Salgado-Maldonado, G; Jiménez-García, I

    2000-04-01

    A new nematode species, Pseudocapillaria ophisterni sp. n., is described from the intestine and rarely from the stomach of the swamp-eel, Ophisternon aenigmaticum Rosen et Greenwood, from Catemaco Lake, Veracruz, Mexico. In having both caudal lobes in the male interconnected by a distinct dorsal membrane, it belongs to the subgenus Ichthyocapillaria. It differs from the three species in this subgenus mainly in possessing either a distinctly longer spicule or a smaller length of oesophagus relative to body length. It also differs in host type and geographical distribution. P. ophisterni is the first capillariid species reported from synbranchiform fishes.

  4. Suplementação de metionina e/ou lisina em rações para juvenis de tambaqui (Colossoma macropomum Cuvier, 1818 Reduction of protein levels and methionine and/or lysine supplementation in diets and their effects in total ammonia nitrogen excretion of tambaqui juveniles (Colossoma macropomum Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Lian V. Brandão

    2009-09-01

    Full Text Available Foi avaliado o efeito da redução dos níveis de proteína e a suplementação de metionina e/ou lisina em rações sobre a excreção de amônia em juvenis de tambaqui (Colossoma macropomum. O experimento foi realizado em delineamento inteiramente casualizado com esquema fatorial de duas entradas: 2 níveis protéicos (25 e 20% e 4 níveis de inclusão de aminoácidos: a 0% de suplementação, b DL-Metionina (3% da PB, c L-lisina (5% da PB e d Dl-Metionina (3% da PB + L-lisina (5% da PB, com duração de 55 dias. A coleta de água das unidades experimentais ocorreu em três momentos (1º dia, 27º dia e 55º dia durante o período experimental. Nestes dias, foram realizadas 3 coletas de amostras de água para análise de amônia de cada unidade experimental (08:00 , 14:00 e 20:00 horas. Os dados de excreção de amônia foram analisados por ANOVA com medidas repetidas no tempo a 5% do nível de significância. A redução em 5% do nível de proteína na dieta gerou uma diminuição de 28,4% na excreção de amônia. Contudo, a suplementação de lisina e metionina não influenciaram esta diminuição.It was evaluated the effect of the reduction of crude protein level (CP and the lysine and/or methionine supplementation in total ammonia nitrogen excretion on tambaqui (Colossoma macropomum juveniles. The experiment developed in a factorial and randomized design with two levels of protein contents (20% and 25% CP and four levels of amino acid supplementation: a Dl-methionine (0% of CP and L-lysine (0% of CP, b Dl-methionine (3% of CP, c L-lysine (5% of CP, d Dl-methionine (3% of CP + L-lysine (5% of CP, during 55 days. The water sampling from experimental units was done at 3 moments (1(0 day, 27(0 day e 55(0 day. In these days, 3 samples of each experimental unit were collected in elapsing of the time (08:00 a.m., 02:00 p.m. and 08:00 p.m.. The ammonia excretion data were analysed by repeated-measures ANOVA (p>0,05 with time as within effect. The reduction of 5% in diet protein, decreased in 28,4% total ammonia excretion decreased, however, the lysine and methionine supplementation did not influenced this factor.

  5. 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.

  6. Desempenho produtivo de juvenis de tambaqui (Colossoma macropomum Cuvier, 1818 alimentados com rações contendo farinha de crueira de mandioca (Manihot esculenta, Crantz em substituição ao milho (Zea mays Performance of juvenile tambaqui (Colossoma macropomum Cuvier, 1818 fed diets containing crueira manioc flour (Manihot esculenta, Crantz in replacement of corn (Zea mays

    Directory of Open Access Journals (Sweden)

    Geraldo Pereira Pereira Junior

    2013-06-01

    Full Text Available O objetivo deste estudo foi avaliar o desempenho produtivo de juvenis de tambaqui (Colossoma macropomum, alimentados com níveis crescentes de farinha de crueira de mandioca, Manihot esculenta (0%, 20%, 40%, 60%, 80%, 100%, como substituto do milho (Zea mays. Os peixes (peso médio inicial de 6,6 ± 0,1 g foram distribuídos aleatoriamente em 24 grupos (20 peixes/grupo e alimentados com as dietas experimentais em quatro repetições para avaliação da performance de crescimento, eficiência alimentar, composição corporal e os custos de produção. As performances de crescimento não foram afetados pelos tratamentos. O teor de lipídio no músculo foi diferentemente significativo em peixes alimentados com 40% e 100% em relação aos outros tratamentos. O custo de produção de milho diminuiu linearmente com a substituição. O valor da dieta diminuiu de R $ 1,43 kg-1 a R $ 1,21 kg-1 e o peixe de R $ 1,54 kg-1 a R $ 1,30 peixe kg-1. Concluiu-se que o milho pode ser totalmente substituído por farinha de crueira de mandioca na dieta de juvenil de tambaqui, sem prejudicar o seu desempenho.The main objective of this study was to evaluate the productive performance of young tambaqui (Colossoma macropum, fed with increasing levels of cassava flour, Manihot esculenta (0%, 20%, 40%, 60%, 80%, 100%, as corn (Zea mays replacement. Fish (initial body weight 6.6 ± 0.1 g were randomly distributed in 24 groups (20 fish/group with four replications. They were fed with the experimental diets for evaluation of growth performances, feed utilization, body composition and production costs. Growth performances were not affected by the dietary treatments. Lipid content in muscle were significant different in fish fed 40% and 100% substitution when compared to the other treatments. The production cost decreased linearly with corn substitution. Diet decreased from R$ 1.43 kg-1 to R$ 1.21 kg-1 and fish production cost from R$ 1.54 kg-1 to R$ 1.30 kg-1 fish. It was concluded that the corn can be totally replaced by cassava flour in juvenile tambaqui diet without adversely affecting the performance of tambaqui.

  7. Farinha de folha de leucena (Leucaena leucocephala Lam. de wit como fonte de proteína para juvenis de tambaqui (Colossoma macropomum CUVIER, 1818 Leucaena leaf flour (Leucaena leucocephala Lam. of wit as a protein source for juveniles of tambaqui (Colossoma macropomum Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Geraldo Pereira Junior

    2013-06-01

    Full Text Available O tambaqui (Colossoma macropomum é um peixe onívoro, natural da bacia amazônica, que possui elevado valor comercial. Características de rusticidade e desempenho produtivo destacam esta espécie para criação em cativeiro. Contudo, em criações comerciais de peixes, os custos com alimentação podem corresponder de 60 a 80% dos custos totais de produção, sendo a proteína o nutriente mais caro da dieta. O objetivo deste trabalho foi avaliar o desempenho produtivo de juvenis de tambaqui alimentados com rações contendo farinha de folha de leucena como fonte protéica. 240 juvenis foram distribuídos em 12 aquários experimentais (350 L, em um delineamento experimental inteiramente casualizado com quatro tratamentos (0%, 8%, 16%, 24% de inclusão de farinha de folha de leucena na ração e três repetições. Foram determinados o ganho de peso, conversão alimentar aparente, taxa de crescimento específico, taxa de eficiência protéica e custo de produção do quilograma de peso vivo ganho. Para as variáveis estudadas, não houve diferença significativa (p>0,05 entre os tratamentos, indicando que é possível incluir até 24% de farinha de folha de leucena em rações para juvenis de tambaqui, sem comprometimento das variáveis estudadas, embora a substituição não tenha representado redução no custo de produção do quilograma de peixe.The tambaqui (Colossoma macropomum is an omnivorous fish native to the Amazon basin, which has high commercial value. Characteristics of rusticity and desirable growth in farming highlight this species for breeding in captivity. However, in commercial fish breeding, feed costs may represent 60-80% of total costs of production, being the protein the most expensive nutrient in the diet. The objective of this study was to evaluate the growth of juvenile tambaqui fed with diets containing leucaena leaf flour as protein source. A total of 240 juveniles were distributed in 12 experimental aquaria (350 L in a completely randomized design with four treatments (0%, 8%, 16%, 24% of inclusion of leucaena leaf flour in diet and three replications. Weight gain, feed conversion ratio, specific growth rate, protein efficiency rate and cost of production per kilogram of live weight gained were calculated. For the studied variables, there was no significant difference (p> 0.05 among treatments, indicating that it is possible to include up to 24% of leucaena leaf flour in diets for juveniles of tambaqui, without compromising the variables studied, although the replacement has not represented reduction in cost of production per kilogram of fish.

  8. Tempo de indução e de recuperação de dourados Salminus brasiliensis (Cuvier, 1816, submetidos a diferentes concentrações de óleo de cravo Eugenia sp. = Induction and recovery time for dourados Salminus brasiliensis (Cuvier, 1816 submitted to different concentrations of clove oil Eugenia sp.

    Directory of Open Access Journals (Sweden)

    2008-07-01

    Full Text Available O presente estudo avaliou o óleo de cravo como anestésico para juvenis de dourado em cinco diferentes concentrações (20, 30, 40, 50 e 60 mg L-1, utilizando como critério para determinação da concentração ideal os tempos de indução e de recuperação ao efeito do anestésico. Em relação aos tempos de indução, verificou-se diferença significativa (p The present study evaluated five different concentrations (20, 30, 40, 50 and 60 mg L-1 of clove oil as an anesthetic for dourado juveniles, using induction and recovery time to determine the ideal concentration. Significant difference (p < 0.05 was observed among 20, 30, 40 and 60 mg L-1 levels of clove oil. However, 50 mg L-1 concentrati on did not show significant difference in comparison to 40 and 60 mg L-1. Regarding recovery time, the shortest time was verified in the concentration of 20 mg L-1. Clove oil is effective and safe as an anesthetic for dourado juveniles in levels between 40 and 60 mg L-1.

  9. Morphological variation in populations of Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae from Madeira and Paraguay river basins Variação morfológica em populações de Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae das bacias dos rios Madeira e Paraguai

    Directory of Open Access Journals (Sweden)

    Willian Massaharu Ohara

    2007-10-01

    Full Text Available The saua Tetragonopterus argenteus is endemic to South America. It has a wide geographic distribution and occurs in different Brazilian basins, such as those of the Madeira and Paraguay rivers. In this work, it was noticed that populations from these basins have morphological variations between them, indicating a possible geographic isolation. Specimens were studied using twelve morphological characters that were submitted to the canonical variates and body proportion analysis. In the canonical variate analysis, the populations from the Madeira and Paraguay river basins were differentiated by caudal peduncle depth, eye diameter, pre-ventral distance, body height, snout length and head length. In the body proportion analysis, the population of Madeira river basin presented head length, orbital diameter, pre-dorsal distance, dorsal-fin length, pre-ventral distance, body height and caudal peduncle height, smaller than those of the population from Paraguay river basin. These results allowed the recognition of intra-specific variation amplitude, that could become an important instrument for management and conservation of this species. O sauá Tetragonopterus argenteus é endêmico da América do Sul, apresenta ampla distribuição geográfica e ocorre em várias bacias brasileiras, entre elas as dos rios Madeira e Paraguai. Neste trabalho foi observado que as populações dessas bacias apresentam variações morfológicas que, provavelmente, representam isolamento geográfico. Exemplares foram estudados através de 12 caracteres morfológicos e submetidos às análises de variáveis canônicas e de proporções corporais. Na análise das variáveis canônicas, as populações das bacias dos rios Madeira e Paraguai diferenciaram-se pelo diâmetro do olho, distância pré-ventral, altura do corpo, comprimento do focinho, altura do pedúnculo caudal e comprimento da cabeça. Na análise das proporções corporais, a população da bacia do rio Madeira apresentou comprimento da cabeça, diâmetro do olho, distância pré-dorsal, comprimento da base da nadadeira dorsal, distância pré ventral, altura do corpo e altura do pedúnculo caudal, menores que os das populações da bacia do rio Paraguai. Esses resultados possibilitam o reconhecimento da amplitude da variação intra-específica, que poderá ser um importante instrumento para o manejo e conservação dessa espécie de peixe.

  10. Digestibilidade aparente dos nutrientes e energia de ração suplementada com enzimas digestivas exógenas para juvenis de tambaqui (Colosssoma macropomum Cuvier, 1818 Apparent digestibility of nutrients and crude energy in diets with addition of exogenous digestive enzymes in tambaqui juveniles ( Colosssoma macropomum Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Jorge Antonio Moreira da Silva

    2007-01-01

    Full Text Available O experimento foi conduzido com o objetivo de avaliar o efeito da adição de um compelxo multienzimático exógeno composto de amilase, protease, lipase e celulase, em rações de juvenis de tambaqui, sobre os coeficientes de digestibilidade aparente (CDa da proteína bruta (PB, extrato etéreo (EE, carboidratos (ENN e energia bruta (EB. O delineamento experimental foi inteiramente casualizado com quatro tratamentos (quatro níveis de inclusão de enzimas, 0,0; 0,05; 0,10; e 0,15 %, três repetições (no tempo e 10 peixes por unidade experimental. Foram utilizados 40 juvenis de tambaqui, com peso médio de 155,0 ± 0,49 g, distribuídos em quatro tanques de alimentação de 500 l, recebendo refeições à vontade das 8 às 12h, a cada hora. Em seguida os animais foram transferidos para coletores de fezes (200 l, onde permaneceram até às 18h, sendo a coleta de dejetos realizada a cada hora. A determinação dos CDa foi realizada pelo método indireto, sendo utilizado como indicador externo 0,5% de óxido de cromo-III (Cr2O3 incorporado à ração. Os resultados demonstraram que a suplementação das dietas com enzimas exógenas para juvenis de tambaqui aumenta a digestibilidade aparente dos nutrientes e energia bruta, no nível de inclusão de 0,05% (PThe experiment evaluated the effect of dietary supplementation a multienzyme complex containing amylase, protease, lipase and cellulase for tambaqui juveniles on the apparent digestibility coefficients (ADCs of crude protein (CP, ether extract (EE, carbohydrates (CHO and crude energy (CE. A completely randomized experimental design was used with four treatments (level of enzymes 0.0; 0.05; 0.10; and 0.15 % and three replicates (over time, with ten fish per experimental unity. Forty fish weighting 155.0 ± 0.49g were distributed in four 500 l feeding tanks and were fed hourly, from 8 to 12 AM. After this period, fish were transferred for fecal collection units until 6 PM, where feces were collected hourly. ADCs were evaluated by an indirect method, with 0.5 % III-chromic oxide (Cr2O3 as innert marker. The results showed that supplementary exogenous enzymes on tambaqui diets increased the apparent digestibility of nutrients and crude energy at inclusion level of 0.05% (P<0.05%.

  11. Redescription of the Indo-Pacific scorpionfish Scorpaenodes guamensis (Quoy & Gaimard 1824) (Scorpaenidae), a senior synonym of seven nominal species.

    Science.gov (United States)

    Motomura, Hiroyuki; Causse, Romain; Struthers, Carl D

    2016-01-21

    The Indo-Pacific scorpionfish, Scorpaenodes guamensis (Quoy & Gaimard 1824), is redescribed on the basis of 137 specimens, including types, from a wide geographic range in the Indo-Pacific. Seven nominal species, Scorpaena rubropunctata Cuvier in Cuvier & Valenciennes 1829, Sebastes minutus Cuvier in Cuvier & Valenciennes 1829, Scorpaena chilioprista Rüppell 1838, Scorpaena polylepis Bleeker 1851, Centropogon echinatus Macleay 1881, Scorpaena erinacea Garman 1903, and Scorpaenopsis quiescens Seale 1906, are regarded here as junior synonyms of S. guamensis. The type status of these nominal species is discussed, and lectotypes of Scorpaena guamensis, Scorpaena rubropunctata, Sebastes minutus, and Scorpaena polylepis are herein designated. Validity of Scorpaenopsis scaber (Ramsay & Ogilby 1886) is also discussed.

  12. PERÍODOS DE ACTIVIDAD Y EFECTO DE LAS VARIABLES AMBIENTALES EN COCODRILOS (Crocodylus acutus Cuvier 1807): EVALUANDO LOS MÉTODOS DE DETERMINACIÓN DE LA FRACCIÓN VISIBLE.

    OpenAIRE

    Escobedo Galván, Armando H.; Escuela de Ciencias Ambientales, Universidad Latina de Costa Rica y Asociación Costarricense de Investigadores en Crocodilidos. (Costa Rica).

    2016-01-01

    Se realizaron un total de 8 muestreos durante los meses de Octubre y Noviembre de 2000, en La Estación Experimental La Rambla ubicada en Río Frío de Sarapiquí en la provincia de Heredia, Costa Rica. Se determinó que los cocodrilos presentan un pico de actividad durante la noche, y que el número de cocodrilos observados se ve afectado por condiciones climáticas previas y durante los muestreos. Se comparó los diferentes métodos estadísticos para calcular la fracción visible, determinando que no...

  13. NEMÁTODOS PARÁSITOS DE Lutjanus synagris (Linneaus, 1758 Y Lutjanus analis (Cuvier, 1828 (PERCIFORMES, LUTJANIDAE EN LAS ZONAS DE SANTA MARTA Y NEGUANJE, CARIBE COLOMBIANO

    Directory of Open Access Journals (Sweden)

    Cortés J.

    2009-09-01

    Full Text Available Se describen los nemátodos encontrados en el sistema digestivo de las especies de pargo Lutjanus synagris y Lutjanus analis. Esta investigación se orientó principalmente a la clasificación taxonómica de los parásitos y no a los efectos o patologías que estos puedan ocasionar en los peces. Se tuvo en cuenta que en Colombia los pargos constituyen uno de los recursos de mayor importancia para la comercialización; Lutjanus synagris y Lutjanus analis son especies demersales explotadas a lo largo de toda la región costera e insular del Caribe colombiano. Los tractos digestivos se colectaron de los pargos capturados artesanalmente (nasa, cordel por pescadores de las zonas de Santa Marta y Neguanje; se identificaron los siguientes géneros de nemátodos: Capillaria spp., Contracaecum spp., Cucullanus spp. y Raphidascaris spp.; el último género fue el más representativo.

  14. Estudos para Composição de uma Dieta Referência Semipurificada para Avaliação de Exigências Nutricionais em Juvenis de Pirapitinga, Piaractus brachypomus (Cuvier, 1818

    Directory of Open Access Journals (Sweden)

    Vásquez-Torres Wálter

    2002-01-01

    Full Text Available Foram realizados dois experimentos com o objetivo de definir uma dieta referência para estudos de exigências nutricionais em Piaractus brachypomus. No primeiro experimento, foram testadas quatro dietas com ingredientes semipurificados (H-440 com 47% PB, C-102 com 41% PB, NRC com 37% PB e IALL-1 com 32% de PB e uma dieta controle (32% de PB com ingredientes comuns. No segundo experimento, foi usada a dieta IALL-1, como base para a formulação de três dietas experimentais. A dieta 2 foi suplementada com vitamina C e uma pré-mistura de macrominerais, enquanto na dieta 3 o óleo vegetal foi substituído por óleo de peixe. O ganho de peso foi usado como critério básico para medir os efeitos das dietas, sendo também considerados consumo de alimento, taxa específica de crescimento (SGR, conversão alimentar aparente (FCR, eficiência de utilização da proteína (PER e retenção de proteína (%PPV e de energia (%RE. Entre as dietas semipurificadas, o melhor desempenho de crescimento e de utilização dos nutrientes foi observado para as dietas NRC e IALL-1, que não diferiram entre si. No segundo experimento, o grupo de peixes alimentados com a dieta 2 apresentou crescimento 42% maior que o observado com as dietas sem suplementação. As outras variáveis analisadas, FCR, SGR, PER e %PPV, também foram significativamente melhoradas. Os resultados em conjunto indicam que a dieta IALL-1 suplementada com macrominerais e vitamina C pode ser considerada adequada como dieta referência semipurificada para estudos de nutrição de Piaractus brachypomus.

  15. Feeding Relationship between Octopus vulgaris (Cuvier, 1797 Early Life-Cycle Stages and Their Prey in the Western Iberian Upwelling System: Correlation of Reciprocal Lipid and Fatty Acid Contents

    Directory of Open Access Journals (Sweden)

    Sílvia Lourenço

    2017-07-01

    Full Text Available Under the influence of the Western Iberian upwelling system, the Iberian Atlantic coast holds important hatcheries and recruitment areas for Octopus vulgaris. Recently identified as an octopus hatchery, the Ría de Vigo harbors an important mesozooplankton community that supports O. vulgaris paralarvae during the first days of their planktonic stage. This study represents a preliminary approach to determine the nutritional link between wild O. vulgaris hatchlings, paralarvae and their zooplankton prey in the Ría de Vigo, by analyzing their lipid class content and fatty acid profiles. The results show that octopus hatchlings are richer in structural lipids as phospholipids and cholesterol, while the zooplankton is richer in reserve lipids like triacylglycerol and waxes. Zooplankton samples are also particularly rich in C18:1n9 and 22:6n3 (DHA, that seem to be successfully incorporated by O. vulgaris paralarvae thus resulting in a distinct fatty acid profile to that of the hatchlings. On the other hand, content in C20:4n6 (ARA is maintained high through development, even though the zooplankton is apparently poorer in this essential fatty acid, confirming its importance for the development of O. vulgaris paralarvae. The content in monounsaturated fatty acids, particularly C18:1n7, and the DHA: EPA ratio are suggested as trophic markers of the diet of O. vulgaris paralarvae.

  16. Evaluación de los aportes de nitrógeno y fósforo al medio procedentes del engorde intensivo de pulpo común (Octopus vulgaris Cuvier)

    OpenAIRE

    Mazón Moya, María José

    2006-01-01

    Presentado como requisito parcial para la obtención del Tí­tulo de Máster Universitario Internacional en Acuicultura, otorgado por la Universidad de Las Palmas de Gran Canaria (ULPGC), el Instituto Canario de Ciencias Marinas (ICCM), y el Centro Internacional de Altos Estudios Agronómicos Mediterráneos de Zaragoza (CIHEAM)

  17. Le statut du genre Barbus Cuvier & Cloquet, 1816. Barbus Kahajani proposé comme nom de substitution pour Barbus tetrazona Bleeker, 1857, un homonyme secondaire de Barbus tetrazona Bleeker, 1955

    NARCIS (Netherlands)

    Hoedeman, J.J.

    1958-01-01

    Il existe encore une grande confusion au sujet du nom de genre correct s’appliquant à beaucoup de petits barbeaux de l’Inde orientale, lesquels, à juste titre, semble-t-il, ne devraient pas être maintenus dans le vieux genre Barbus. Pour ces espèces, et en particulier pour les espèces asiatiques, on

  18. Evaluación del tiempo de evacuación gástrica de la cachama blanca Piaractus brachypomus (Cuvier, 1818, utilizando diferentes frecuencias de alimentación y ayuno

    Directory of Open Access Journals (Sweden)

    José Ader Gómez-Peñaranda

    2013-12-01

    Full Text Available Este estudio estima el tiempo de vaciado del estómago de la cachama blanca (Piaractus brachypomus en el día de comienzo regular de alimentación posterior a un periodo de ayuno. Para el efecto, se recolectaron muestras de contenido estomacal en periodos de dos horas después del suministro de alimento (9:30 y 15:30 h hasta el primer indicio de vaciado. Se utilizaron cachamas con un peso de 360 ± 12 g dispuestas en cuatro tratamientos: (1 T1 = alimentación a saciedad durante 5 días y ayuno de 2 días, (2 T2 = alimentación a saciedad durante 6 días y ayuno de 1 día, (3 T3 = alimentación a saciedad durante 7 días, y (4 TC = alimentación siguiendo las tablas recomendadas por el fabricante del alimento. El análisis de datos se realizó mediante ANOVA de medidas repetidas, empleando como factores el tratamiento y el tiempo de vaciado, siendo cada repetición la unidad experimental. Las cachamas del tratamiento T1 presentaron mayor cantidad de alimento en el estómago en los muestreos posteriores al suministro de la primera y segunda ración. A diferencia del tratamiento T1, en los demás las cachamas vaciaron su contenido en el estómago en el periodo comprendido entre la primera y la segunda ración de alimentación y en el periodo posterior a la segunda ración. Por tanto, cuando el contenido estomacal fue mayor, debido a un mayor consumo de alimento en la ración, como en el caso del tratamiento (T1, el tiempo necesario para vaciar el estómago de las cachamas se incrementó.

  19. Parâmetros populacionais e simulação do rendimento por recruta de Salminus brasiliensis (Cuvier, 1816 do alto rio Paraná - DOI: 10.4025/actascibiolsci.v26i3.1593 Population parameters and simulation of the yield per recruit of Salminus brasiliensis (Cuvier, 1816 from the upper Paraná River - DOI: 10.4025/actascibiolsci.v26i3.1593

    Directory of Open Access Journals (Sweden)

    Angelo Antonio Agostinho

    2004-04-01

    Full Text Available O dourado Salminus brasiliensis é uma espécie explorada por todos os tipos de pesca na bacia do rio Paraná e sua captura tem sido diminuída nos últimos anos. Nesse contexto, o presente trabalho tem por objetivo simular o rendimento por recruta de S. brasiliensis partindo da necessidade de rever a regulamentação de pesca, na tentativa de conservar os estoques da espécie. Para realizar o trabalho, foram usados os dados de captura junto aos pescadores profissionais do município de Porto Rico, Estado do Paraná, no período de outubro de 1986 a setembro de 1988, amostrados com redes de espera, com linha e anzol, com espinhéis e com anzóis de galho. A simulação do rendimento por recruta foi realizada considerando diversos cenários de mortalidade por pesca e comprimentos mínimos de captura, a partir do modelo de rendimento de equilíbrio de Beverton e Holt, modificado por Jones. A simulação mostrou um incremento no rendimento por recruta para os comprimentos mínimos de 60 e de 65cm, sugerindo que mudanças na legislação em vigor devem ser consideradas. Além disso, sugerimos mudanças nos procedimentos operacionais das barragens, na época de reprodução da espécie, e proteção da pesca nos locais de desova e nos criadouros naturaisThe “dourado” Salminus brasiliensis (Characidae is caught in all types of fisheries conducted in the upper Paraná River. However, a decline has been observed in the quantity of S. brasiliensis harvested in recent years. In this paper, we deal with simulation of yield per recruit, in order to evaluate ongoing fishery regulation. We expect to generate information that guides the conservation of this species. Data from the artisanal fishery were gathered from October 1986 to September 1988, in the city of Porto Rico. In that region, to catch the “dourado”, fishers use gillnets, hook and line, long lines and branch hooks. Simulations of yield per recruit were performed under diverse scenarios of fishing mortality and minimum size of capture, using the equilibrium model of Beverton and Holt, modified by Jones. Simulations showed increase in the yield per recruit when minimum sizes of capture were 60cm and 65cm, suggesting that a review of ongoing fishery regulation is needed. In addition, adjustments in dam operations during the spawning season of the species, and protection and prohibition of the fishery in nursery and spawning areas are suggested

  20. The daily weight gain, growth rate and length-weight relationships of ...

    African Journals Online (AJOL)

    The daily weight gain, growth rate and length-weight relationships of Clarias gariepinus, Heterobranchus longifilis and their reciprocal hybrids (Pisces: Clariidae) reared under ambient environmental conditions.

  1. Los robalos (pisces, centropomidae) del Pacífico De Panamá: desafíos emergentes en investigación y conservación

    OpenAIRE

    Vergara-Chen, Carlos

    2014-01-01

    Se evalúa la diversidad taxonómica, distribución geográfica, ciclo biológico, ecología y pesquerías de los robalos (género Centropomus).Ellos comparten muchas características de su ciclo de vida y uso del hábitat que los hacen vulnerables al estrés ambiental y antropogénico en los ecosistemas costeros. La taxonomía de los robalos parece estable. Estas especies se distribuyen en todos los manglares y estuarios. Aunque desovan en hábitats marinos, las larvas se dispersan en entornos estuarinos,...

  2. The impact of Manjil and Tarik dams (Sefidroud River, southern Caspian Sea basin on morphological traits of Siah Mahi Capoeta gracilis (Pisces: Cyprinidae

    Directory of Open Access Journals (Sweden)

    Adeleh Heidari

    2013-08-01

    Full Text Available It has been postulated that the building of the Manjil and Tarik dams on Sefidroud River has led to the body shape variation of Capoeta gracilis in up- and downstream populations due to the isolation. In this study, Geometric morphometric approach was used to explore body shape variations of Capoeta gracilis populations in up- and downstream Manjil and Tarik dams in Sefidroud River from south of the Caspian Sea basin. The shape of 90 individuals from three sampling sites was extracted by recording the 2-D coordinates of 13 landmark points. PCA, CVA, DFA and CA analysis were used to examine shape differences among the populations. The significant differences were found among the shape of the populations and these differences were observed in the snout, the caudal peduncle and head. The present study indicated the body shape differences in the populations of Capoeta gracilis in the Sefidroud River across the Manjil and Tarik dams, probably due to the dam construction showing anthropogenic transformation of rivers influences body shape in an aquatic organism.

  3. MORTALITY OF YOUTH Arapaima gigas (PISCES: ARAPAIMIDAE FROM A FISH FARMING IN THE NORTH OF BRAZIL, CAUSED BY Hysterothylacium sp. AND Goezia spinulosa (NEMATODA: ANISAKIDAE

    Directory of Open Access Journals (Sweden)

    Patrizia Batista de Azevedo

    2017-03-01

    Full Text Available In youth A. gigas the risk of parasitic infections is very high, due to their feeding habit to prey on small invertebrates, which act as intermediate hosts of different endoparasite species, which can cause serious problems and high mortalities in fish farms. Thus, the aim of the present study was to identify the species that parasitize youth A. gigas raised in captivity in the Manacapuru municipality, Amazonas State and to evaluate their influence on the mortality of these fish. There were examined 66 youth A. gigas and non-parasite was recorded in the host gills. The intestine and stomach of the fish were parasitized by Hysterothylacium sp. larvae (L3 and Goezia spinulosa larvae (L4. The parasitic indexes were high for the two species, being recorded the highest rates of infection by Hysterothylacium sp. There was observed a weak positive correlation between the host standard length and the abundance of Hysterothylacium sp. The lesions observed in the stomach and intestine of the fish, together with the high parasite index values recorded for Hysterothylacium sp. and Goezia spinulosa, leads to the suspicion that the death of the fish was due to complications and damages caused by the presence of these parasites. Keywords: Amazonia; arapaima; death; nematodes.

  4. The total body length and body weight examination among gabus Sentani fish population, Oxyeleotris heterodon, Weber 1907 (Pisces: Eleotridae) of Sentani lake, Papua, Indonesia

    Science.gov (United States)

    Sriyani, E. D.; Abinawanto, Bowolaksono, A.

    2017-07-01

    The gabus Sentani fish lived in the Sentani Lake, Papua, since million years ago. Nowadays, the population of those species is getting extinct because of the overexploitation, whereas the culture effort of this species has not been developed, yet. The purpose of the study was to examine the total body length and body weight collected from some villages surrounding Sentani Lake such as Ifar village, Sosiri village, and Putali village. The body weight average of gabus fish from Ifar village, Sosiri village, and Putali village were 373.53 g, 426.86 g, and 118.34 g respectively. While the total body length average of gabus Sentani fish from Ifar village, Sosiri village, and Putali village were 279.30 mm, 223.30 mm and 222.06 mm, respectively. The growth model was W = 0.021067L3.086 with R2 value was 35.8 %, and r value was 0.598. Gabus Sentani fish, Oxyeleotris heterodon (Weber 1907) exhibited positive allometric (b > 3).

  5. First approach to the trophic ecology and diet of the rainbow runner, Elagatis bipinnulata (Quoy and Gaimard, 1825) (Pisces: Carangidae), in the central Colombian Caribbean

    International Nuclear Information System (INIS)

    Garcia Ramirez, Camilo Bernardo; Posada, Camila

    2014-01-01

    The rainbow runner (Elagatis bipinnulata) scores high in trophic level (4.24) but it is not a voracious fish (Q/B = 10.8). its diet is dominated by the dwarf herring (Jenkinsia lamprotaenia), eats more in the dry season, than in the rainy season and significantly more in the afternoon that in the morning suggesting preference for daylight feeding.

  6. Reproductive indicators of Parauchenipterus striatulus (Steindachner) (Pisces, Auchenipteridae) in the Ribeirão das Lajes reservoir, Rio de Janeiro, Brasil

    OpenAIRE

    Araújo, Francisco Gerson; Duarte, Silvana; Goldberg, Rubens Sterental; Fichberg, Liana

    1999-01-01

    Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using...

  7. Diet and feeding ecology of the little tunny, Euthynnus alletteratus (Pisces: Scombridae in the central Colombian Caribbean: changes in 18 years

    Directory of Open Access Journals (Sweden)

    Camilo B García

    2013-07-01

    Full Text Available Trophic ecology and diet of the little tunny (Euthynnus alletteratus in central Colombian Caribbean is described. The little tunny is a pelagic top predator but not a voracious fish (trophic level of 4.49, Q/B of 10.8. Its diet seems impoverished when compared with a study conducted in 1986 in the same general location and with studies in other locations. Moreover, the main diet item has changed, new items have appeared and other have disappeared in the time interval between 1986 and the present study (2003/2004, 18 years. Lack of monitoring of pelagic fish populations precludes the identification of tendencies but a regime change hypothesis is worth investigating. The little tunny eats more in the dry season than in the rainy season and diet items change with seasons in line with findings of other studies that signal correlations between seasons and diet. Likewise, local little tunny eats more in the afternoon than in the morning which suggests it eats in daylight not in the night contrary to what has been found in studies somewhere else.

  8. First records and a comparative study of larvae of Arnoglossus tapeinosoma (Bleeker) and Arnoglossus aspilos (Bleeker) (Bothidae-Pisces) from the Indian Ocean and adjacent waters

    Digital Repository Service at National Institute of Oceanography (India)

    Devi, C.B.L.

    stream_size 3 stream_content_type text/plain stream_name Proc_Kerala_Sci_Cong_1991_158.pdf.txt stream_source_info Proc_Kerala_Sci_Cong_1991_158.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  9. Parasites and hystopathology of Mullus barbatus and Citharus linguatula (Pisces from two sites in the NW Mediterranean with different degrees of pollution

    Directory of Open Access Journals (Sweden)

    Marta Carreras-Aubets

    2011-06-01

    Full Text Available The usefulness of fish parasite communities as bioindicators of environmental stress was tested on two benthic fish species, the red mullet (Mullus barbatus and the spotted flounder (Citharus linguatula, during the spring of 2006 at two sites of the Catalan coast (northwestern Mediterranean: an anthropogenic-impacted area located close to the city of Barcelona, and a less polluted area close to Blanes (Girona. Gonadosomatic and hepatosomatic indices and condition factor were determined for the fishes caught. Prevalence, mean intensity, mean abundance and species richness of the parasites found in the survey were calculated for both species and locations, and the main histological alterations were recorded. Cysts of unknown aetiology and intestinal coccidians were reported only in red mullets from the area close to Barcelona, which were highly parasitized by the digenean Opecoeloides furcatus and the nematode Capillaria sp. However, a higher prevalence of Ichthyophonus sp. was reported in the spotted flounder from Blanes. Cysts of unknown aetiology, some nematodes and Ichthyophonus sp. may be associated with pollution.

  10. Reproducción del pez erizo, Diodon holocanthus (Pisces: Diodontidae en la plataforma continental del Pacífico Central Mexicano

    Directory of Open Access Journals (Sweden)

    Gabriela Lucano-Ramírez

    2011-03-01

    Full Text Available Diodon holocanthus es una especie con cierta importancia comercial y ecológica en la comunidad de peces que forma la fauna de acompañamiento del camarón en la plataforma continental del Pacífico central Mexicano, y de la cual no se conocen aspectos reproductivos. Por lo cual se obtuvieron el periodo de reproducción, la descripción macro y microscópica de las gónadas, además de variables poblacionales como: distribución de tallas, proporción sexual y talla de madurez. En total se capturaron alrededor de 400 organismos, los cuales presentaron una talla mínima de 5.0cm, máxima de 40.3cm y promedio de 18.4cm, y fueron capturados en la plataforma continental en el Pacífico central Mexicano, desde diciembre de 1995 a diciembre de 1998. La proporción sexual fue de 1:0.86 hembras por machos (n=253. La talla a la cual el 50% de individuos presentó gónadas maduras fue 19.7cm en las hembras y 20.1cm en los machos. Los organismos con las menores tallas que presentaron gónadas en fase de maduración midieron 12.2cm (hembras y 13cm (machos. En ambos sexos el desarrollo de la gónada se determinó con base en una escala de maduración de cuatro estadios. En el proceso de maduración de los ovocitos se identificaron cinco fases de desarrollo. El patrón de desarrollo de los ovocitos es de tipo asincrónico, lo que significa que la especie se puede reproducir varias veces al año. El desarrollo del testículo es de tipo lobular como en la mayoría de los peces teleósteos. El índice gonadosomático sugiere que el periodo de reproducción se concentra en los meses de junio, y de septiembre a diciembre.

  11. Oligomeric protein complexes of apolipoproteins stabilize the internal fluid environment of organism in redfins of the Tribolodon genus [Pisces; Cypriniformes, Cyprinidae].

    Science.gov (United States)

    Andreeva, Alla M; Serebryakova, Marina V; Lamash, Nina E

    2017-06-01

    One of the most important functions of plasma proteins in vertebrates is their participation in osmotic homeostasis in the organism. Modern concepts about plasma proteins and their capillary filtration are based on a model of large monomeric proteins that are able to penetrate the interstitial space. At the same time, it was revealed that a considerable amount of oligomeric complexes are present in the low-molecular-weight (LM) protein fraction in the extracellular fluids of fishes. The functions of these complexes are unknown. In the present study, we investigated the LM-fraction proteins in the plasma and interstitial fluid (IF) of redfins of the genus Tribolodon. This fish alternatively spends parts of its life cycle in saline and fresh waters. We identified the protein Wap65, serpins and apolipoproteins in this fraction. By combining the methods of 2D-E under native and denaturing conditions with MALDI, we demonstrated that only apolipoproteins formed complexes. We showed that serum apolipoproteins (АроА-I, Аро-14) were present in the form of homooligomeric complexes that were dissociated with the release of monomeric forms of proteins in the course of capillary filtration to IF. Dissociation of homooligomers is not directly correlated with the change in salinity but is correlated with seasonal dynamics. We found that there was a significant decrease in the total protein concentration in IF relative to plasma. Therefore, we suggested that dissociation of homooligomeric complexes from various apolipoproteins supports the isoosmoticity of extracellular fluids relative to capillary wall stabilization through a fluid medium in fish. Copyright © 2017 Elsevier Inc. All rights reserved.

  12. Distribution, population biology, and trophic ecology of the deepwater demersal fish Halosauropsis macrochir (Pisces: Halosauridae on the mid-Atlantic Ridge.

    Directory of Open Access Journals (Sweden)

    Odd Aksel Bergstad

    Full Text Available Halosauropsis macrochir ranked amongst the most abundant and widespread demersal fishes on the mid-Atlantic Ridge of the North Atlantic (Iceland-Azores with greatest abundance at 1700-3500 m. All sizes, ranging from 10-76 cm total length, occurred in the area without any apparent spatial pattern or depth trend. Using otolith sections displaying growth increments assumed to represent annuli, the age range recorded was 2-36 years, but most individuals were <20 years. Length and weight at age data were used to fit growth models. No differences between sexes in length and weight at age were observed. The majority of samples had a surplus of males. Diet analysis showed that H. macrochir feeds on Crustacea, Teleostei, Polychaeta, and Cephalopoda, but few prey could be identified to lower taxonomical levels. The mid-Atlantic Ridge constitutes a major portion of the North Atlantic living space of the abyssal halosaur where it completes its full life cycle, primarily as an actively foraging euryophagous micronekton/epibenthos and infauna feeder, becoming a partial piscivore with increasing size.

  13. Alimentación de Chirostoma humboldtianum (Valenciennes; (Pisces: atherinopsidae en el estanque JC en Soyaniquilpan, Estado de México

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    G. Elías Fernández

    2008-01-01

    Full Text Available Los charales son peces endémicos del centro de México que han sido consumidos desde épocas prehispánicas, en la actualidad, el volumen de su captura ha disminuido por diversos motivos como la sobrepesca y la contaminación del hábitat, por lo cual es muy importante estudiar las poblaciones que quedan para conocer sus requerimientos ecológicos y alimenticios y poder plantear alternativas para su conservación. Por lo anterior, los objetivos de este trabajo fueron: determinar los grupos alimenticios que consume Chirostoma humboldtianum en el estanque JC en Soyaniquilpan, Estado de México y la variación de algunos parámetros físicos y químicos del agua. Se realizaron seis muestreos mensuales de diciembre de 2001 a mayo de 2002. Se registró la temperatura, la profundidad, la transparencia, la conductividad, la turbiedad, el pH, el oxígeno disuelto, la dureza y la alcalinidad. Los peces se capturaron con un chinchorro de 25 metros de longitud y 8 mm de abertura y fueron fijados con formalina al 10 %. El contenido alimenticio fue identificado con claves especializadas. Para determinar el porcentaje de los grupos alimenticios se utilizó el método volumétrico y de frecuencias. Se encontró que el agua es templada, turbia, con regular cantidad de oxígeno disuelto, de dureza moderada. Chirostoma humboldtianum consumió 21 tipos de organismos, destacando Keratella, Trichocerca, Asplanchna, Bosmina, además de copépodos, coríxidos y quironómidos. El método de frecuencias mostró a Cyclops y Keratella como el alimento preferencial.

  14. Library holdings for PC1106 Multibeam Sonar Workshop on NOAA Ship Pisces in the Gulf of Mexico between August 29, 2011 and September 2, 2011

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Library Catalog may include: Data Management Plans, Cruise Plans, Cruise Summary Reports, Scientific "Quick Look Reports", Video Annotation Logs, Image Collections,...

  15. Descripción histológica comparativa del desarrollo del sistema digestivo y visual de larvas de chame Dormitator latifrons (Pisces: Eleotridae

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    Vanesa V López-López

    2015-07-01

    Full Text Available Se realizó la descripción del desarrollo de larvas de uno a seis días post-eclosión (dpe, para generar información que ayude a comprender la capacidad alimenticia en etapas tempranas. Las larvas se obtuvieron mediante la inducción hormonal de reproductores, utilizando implantes de análogos sintéticos de GnRH durante la temporada de septiembre-noviembre de 2010. Las muestras fueron incluídas en historesina y teñidas con hematoxilina-eosina. Una vez eclosionada, la larva presenta gran cantidad de vitelo que absorbe gradualmente (1° a 3° dpe. Al 4° dpe, existe una cavidad bucal abierta con estructuras dentales, en este estadio se ha completado el desarrollo ocular, que presenta pigmentación. Se observa la formación de las hendiduras branquiales y se diferencia el intestino en anterior y posterior y se distingue la presencia de vacuolas digestivas en el intestino anterior. En el 5° dpe, se observaron los paquetes de fibras musculares y se distinguió una estructura estomacal. En el 6° dpe, el páncreas, pliegues intestinales y membrana de borde de cepillo son visibles y se observaron partículas de alimento y bacterias dentro del intestino. En base a lo anterior, se concluye que las larvas de D. latifrons han desarrollado completamente el tracto digestivo y órganos asociados que le ayudarán a la búsqueda de alimento, entonces a partir del 4° dpe son capaces de iniciar la alimentación exógena.

  16. Influence of Be seeding on microstructures of tungsten exposed to D–He mixture plasmas in PISCES and its impacts on retention properties

    International Nuclear Information System (INIS)

    Miyamoto, Mitsutaka; Nishijima, Daisuke; Baldwin, Matthew; Doerner, Russ; Ueda, Yoshio; Sagara, Akio

    2013-01-01

    Microstructural changes and their impacts on D retention properties in tungsten (W) are investigated due to mixed species D–Be–He plasma exposure. Be seeding to D + He mixture plasmas results in the suppression of high density He nano-bubbles, which are distinctive internal defects observed in He irradiated/exposed metals. In contrast, cavities appear in the near surface of W exposed to D + Be plasmas, when a thick Be deposition layer forms. Since bubbles are not generally observed in W exposed to D plasma, the cavities seem to be deuterium bubbles formed in the deposited Be layer. While D retention significantly decreases in W exposed to D + He plasma without Be, Be seeding to D + He mixture plasmas obstructs this He seeding effect. As a consequence, it is considered that Be seeding has a more dominant influence on microstructures and D retention in plasma-exposed W than He seeding

  17. 2D or Not 2D? Testing the Utility of 2D Vs. 3D Landmark Data in Geometric Morphometrics of the Sculpin Subfamily Oligocottinae (Pisces; Cottoidea).

    Science.gov (United States)

    Buser, Thaddaeus J; Sidlauskas, Brian L; Summers, Adam P

    2018-05-01

    We contrast 2D vs. 3D landmark-based geometric morphometrics in the fish subfamily Oligocottinae by using 3D landmarks from CT-generated models and comparing the morphospace of the 3D landmarks to one based on 2D landmarks from images. The 2D and 3D shape variables capture common patterns across taxa, such that the pairwise Procrustes distances among taxa correspond and the trends captured by principal component analysis are similar in the xy plane. We use the two sets of landmarks to test several ecomorphological hypotheses from the literature. Both 2D and 3D data reject the hypothesis that head shape correlates significantly with the depth at which a species is commonly found. However, in taxa where shape variation in the z-axis is high, the 2D shape variables show sufficiently strong distortion to influence the outcome of the hypothesis tests regarding the relationship between mouth size and feeding ecology. Only the 3D data support previous studies which showed that large mouth sizes correlate positively with high percentages of elusive prey in the diet. When used to test for morphological divergence, 3D data show no evidence of divergence, while 2D data show that one clade of oligocottines has diverged from all others. This clade shows the greatest degree of z-axis body depth within Oligocottinae, and we conclude that the inability of the 2D approach to capture this lateral body depth causes the incongruence between 2D and 3D analyses. Anat Rec, 301:806-818, 2018. © 2017 Wiley Periodicals, Inc. © 2017 Wiley Periodicals, Inc.

  18. Efectos de la concentración de glucosa sobre la activación de la movilidad espermática en bocachico Prochilodus magdalenae (Pisces, Characiformes

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    Gregorio Martínez

    2011-05-01

    Full Text Available Objetivo. Determinar la concentración de glucosa no activadora de la movilidad espermática como componente de futuros diluyentes para la crioconservación de semen de Prochilodus magdalenae. Materiales y métodos. Se analizó semen inactivo de tres machos obtenido por inducción hormonal. Una submuestra de 0.25 µL de semen de cada macho fue depositada sobre una cámara de Makler y evaluada usando diferentes concentraciones de glucosa (0, 1, 2, 3, 4, 5, 6, 7, 8, 9 y 10% mediante la adición de 75 µL de cada solución sobre el semen (n=3. De cada solución se determinó la osmolaridad, siendo de 0, 62, 124, 186, 250, 310, 360, 410, 472, 536 y 620 mOsm/kg, respectivamente, así como la del plasma seminal (~250���300 mOsm/kg. Mediante el software Sperm Class Analyzer (SCA se determinó la velocidad curvilínea (VCL y recta (VSL (µm/seg, movilidad rápida (%, media (% y lenta (% y el porcentaje de espermatozoides inmóviles. El tiempo de activación de la movilidad (segundos se obtuvo por cronometraje y visualización bajo microscopio de campo claro. Resultados. Concentraciones de 0 a 5% de glucosa produjeron activación de la movilidad espermática, no obstante, a partir de glucosa al 6% no fue detectada activación visual; sin embargo, SCA detectó movilidad total (7.2%, VCL (5.1 µm/seg y VSL (1.7 µm/seg. A partir de glucosa al 7% el SCA detectó 100% de inmovilidad, no adquirida posteriormente con agua destilada. Conclusiones. La concentración de glucosa tiene efecto determinante en la viabilidad y activación de semen fresco. Una concentración de 6% de glucosa puede ser utilizada como solución no activadora de la movilidad espermática en futuros diluyentes para la crioconservación de semen de esta especie.

  19. Reproduction of Mugil curema (Pisces: Mugilidae from the Cuyutlán lagoon, in the Pacific coast of México

    Directory of Open Access Journals (Sweden)

    E. G. Cabral-Solís

    2010-01-01

    Full Text Available Se analizó la reproducción de la lebrancha o liseta Mugil curema (Valenciennes, 1836 en la laguna de Cuyutlán, Colima, México. La relación macho:hembra fue 0.63:1.00. Los peces fueron capturados durante un año. Se observaron hembras ovígeras todo el año, con dos picos: uno en verano (agosto y otro en invierno (enerofebrero. Los machos y las hembras mostraron características de madurez sexual (L50 a la talla promedio, de 270 mm, y de 255 mm, que corresponden a cuatro y cinco años de edad, respectivamente. La talla mínima de reproducción en machos y hembras fue 105 mm de longitud total. El índice gonadosomático fue más alto en agosto y febrero. La relación alométrica del índice hepatosomático fue LW = 6.00·10-6·TL4.013. Los factores de condición de Fulton y Safran se incrementaron de diciembre a marzo. La fecundidad varió, de 9,612 a 238,795 ovocitos en hembras de cero a cinco años de edad, y la fecundidad relativa promedio fue de 1,120 oocitos·g-1 (850 a 1,176 ovocitos·g-1. Los resultados sugieren establecer una temporada de veda del 15 de junio al 15 de septiembre, y el uso del tamaño de malla reglamentario, que es de 2 ¾ pulgadas, en las redes agalleras.

  20. Hábitos alimentarios del pargo mancha Lutjanus guttatus (Pisces: Lutjanidae en Los Cóbanos y Puerto La Libertad, El Salvador

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    José Rodrigo Rojas M.

    2004-03-01

    Full Text Available Se determinaron los hábitos alimentarios del pargo mancha Lutjanus guttatus a partir de 175 ejemplares (9.8 y 58.0 cm LT, recolectados entre enero y diciembre del 2000 en Los Cóbanos y Puerto La Libertad, El Salvador. L. guttatus es un depredador carnívoro oportunista bentónico. La biomasa total fue de 260.5g. Los crustáceos, representados por seis familias (Squillidae, Portunidae, Dynomenidae, Penaeidae, Sicyoniidae, Callianassidae, constituyeron el 50.4% de la biomasa total. Numéricamente, la especie que más consumió el pargo mancha fue Portunus asper. Especimenes menores de 16 cm LT consumen preferentemente crustáceos. Después de los 24 cm y hasta los 44 cm el espectro alimenticio se ve diversificado con la inclusión de peces y moluscos. El 59.5% de los estómagos contenían restos (escamas, exoesqueletos y rostros de camarones con una biomasa de 47.8 g. Se discute sobre la importancia comercial de este recurso y de la ausencia de una estrategia de manejoA total of 175 spotted snapper Lutjanus guttatus were collected monthly in the Los Cobanos and Puerto La Libertad, El Salvador, from January to December 2000 to determine its feeding habits. The fishes studied ranged 9.8 - 58.0 cm in total length. Were collected using pushnet and hook and line. This snapper is a bentonic opportunistic carnivorous predator. The total biomass of the stomach contents was 260.5 g. Crustaceans (Squillidae, Portunidae, Dynomenidae, Penaeidae, Sicyoniidae, Callianassidae, were the most abundant group; they accounted for 50.4% of the total biomass. Numerically, Portunus asper was the most abundant prey. Ontogenic differences were observed in the diet. In juveniles (16 cm TL, at any time of the year, the most frequent and abundant components were crustaceans and in adults were crustaceans, fishes and mollusks. The relative importance of different components of the diet was assessed with two indexes that combine, in different ways, percentage frequency of occurrence, percentage number and percentage weight of prey categories. The commercial use this resource and the absence of management strategies are discussed