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Sample records for callinectes sapidus fisheries

  1. Occurrence of the blue crab Callinectes sapidus, Rathbun, 1896, and its fisheries biology in Bardawil Lagoon, Sinai Peninsula, Egypt

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    Fatma A. Abdel Razek

    2016-06-01

    Full Text Available This study reports the yearly occurrence and the biology of fisheries belonging to the blue crab Callinectes sapidus (Rath. in the catch yield of Bardawil Lagoon (BL in Sinai Peninsula, Egypt over the past 15 years. The study shows that between the years 2000–2015 the crustacean fishery increased (pooling both shrimp and crabs with fluctuations from 40% to 63% of the total production of the lagoon. The crab yield, during this period, increased from 19% to 42% of the total lagoon production. Moreover, the results show that the crab catch of BL is composed mainly of two crab species Portunus pelagicus (L. and C. sapidus (Rath.. The latter is considered the most dominant in the crab yield with 85% of the total crab production, while C. sapidus is only 15%. The size of C. sapidus ranged between 65 and 155 mm (carapace width with a dominance of the class size 105 mm. Furthermore, the ratio of C. sapidus males to females was in favor of males. The regression of width–length relationship showed a marked deviation from the isometric growth. Length–width and body weight regressions also showed deviations from the isometric growth and the analysis of the covariance. This indicates the significant difference between sexes in respect to length weight relationship. The interrelationships between width–length and propodus length and depth of males and with abdomen in females of C. sapidus suggested that in most conditions the relationships were positive and highly significant. This study shows the first insights on the status of C. sapidus in Bardawil Lagoon, Egypt.

  2. (Callinectes sapidus) from Contaminated Site

    African Journals Online (AJOL)

    To elucidate seasonal changes in hydrocarbons including polycyclic aromatic hydrocarbons (PAHs) due to oil spill, tissues of blue crab (Callinectes sapidus) were investigated. Total petroleum hydrocarbons (n-alkanes) concentrations ranged from 0.17-0.32ìg/gdw and 0.28-0.62ìg/gdw during the dry and wet seasons ...

  3. Detection of naphthalene by the blue crab, Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Pearson, W.H.; Olla, B.L.

    1979-03-01

    Increases in the antennular flicking rate indicated that blue crabs, Callinectes sapidus, detected the petroleum hydrocarbon naphthalene. A low incidence of aggressive displays but no food searching or gathering followed naphthalene detection. The results suggest that the chemosensory abilities of decapod crustaceans cover a broader range of substances than previously supposed.

  4. Prevalence and distribution of three protozoan symbionts in blue crab (Callinectes sapidus) populations across Louisiana, USA.

    Science.gov (United States)

    Rogers, Holly A; Taylor, Sabrina S; Hawke, John P; Anderson Lively, Julie A

    2015-05-11

    Louisiana has one of the largest blue crab (Callinectes sapidus) fisheries in the USA, but little is known about blue crab diseases, parasites, and symbionts in this area. In 2013-2014, large juvenile and adult blue crabs were collected at 4 diverse sites to determine the prevalence of the protozoan symbionts associated with black gill disease (Lagenophrys callinectes), buckshot crabs (Urosporidium crescens), and bitter crab disease (Hematodinium perezi). A high aggregate prevalence of L. callinectes (93.2%) was identified across all seasons at all 4 collection sites regardless of salinity. A moderately low aggregate prevalence of U. crescens (22.4%) was identified across all seasons and sites. Prevalence of U. crescens depended on site salinity, with only 10% of infections detected at sites with callinectes and U. crescens are commensal parasites of blue crabs, infections can result in unmarketable and unappealing meat. In the Louisiana fishery, H. perezi has been blamed circumstantially for adult mortalities in the low salinity nearshore fishing grounds. Despite this, H. perezi was not detected in any of the large crabs sampled, even from the low salinity sites. The prevalence data reported here for these 3 protozoans are the first to include blue crabs sampled seasonally at multiple locations along the Louisiana coast over the period of a year.

  5. Mercury content of blue crabs (Callinectes sapidus) from southern New England coastal habitats: Contamination in an emergent fishery and risks to human consumers.

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    Taylor, David L; Calabrese, Nicholas M

    2018-01-01

    Total mercury (Hg; ppm dry weight) was measured in blue crabs, Callinectes sapidus, collected from Narraganset Bay and adjacent coastal lagoons and tidal rivers (Rhode Island/Massachusetts, USA) from May to August 2006-2016. For juvenile crabs (21-79mm carapace width, CW), total Hg was significantly greater in chelae muscle tissue (mean±1 SD=0.32±0.21ppm; n=65) relative to whole bodies (0.21±0.16ppm; n=19), and irrespective of tissue-type, crab Hg was positively related to CW indicating bioaccumulation of the toxicant. Across a broader range of crab sizes (43-185mm CW; n=465), muscle Hg concentrations were significantly higher in crabs from the Taunton River relative to other locations (0.71±0.35ppm and 0.20±0.10ppm, respectively). Spatial variations in crab Hg dynamics were attributed to habitat-specific Hg burdens of their prey, including bivalves, gastropods, polychaetes, and shrimp. Prey Hg, in turn, was directly related to localized sediment Hg and methylmercury conditions. Biota-sediment accumulation factors for crabs and prey were negatively correlated with sediment organic content, verifying that organically-enriched substrates reduce Hg bioavailability. From a human health perspective, frequent consumption of crabs from the Taunton River may pose a human health risk (23% of legal-size crabs exceeded US EPA threshold level); thus justifying spatially-explicit Hg advisories for this species. Copyright © 2017 Elsevier Ltd. All rights reserved.

  6. Crustacea, Decapoda, Portunidae, Callinectes sapidus Rathbun, 1896: new record and filling distribution gaps

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    Rosa, Leonardo

    2013-01-01

    The blue crab Callinectes sapidus Rathbun, 1896 (Crustacea: Decapoda: Portunidae) is firstly recorded from the state of Sergipe, NE Brazil, filling a gap in the species distribution along Brazilian coast.

  7. Histopathological characterization and in situ detection of Callinectes sapidus reovirus.

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    Tang, Kathy F J; Messick, Gretchen A; Pantoja, Carlos R; Redman, Rita M; Lightner, Donald V

    2011-11-01

    A reovirus (tentatively designated as Callinectes sapidus reovirus, CsRV) was found in the blue crabs C. sapidus collected in Chesapeake Bay in 2005. Histological examination of hepatopancreas and gill from infected crabs revealed eosinophilic to basophilic, cytoplasmic, inclusions in hemocytes and in cells of connective tissue. A cDNA library was constructed from total RNA extracted from hemolymph of infected crabs. One clone (designated as CsRV-28) with a 532-bp insert was 75% identical in nucleotide sequence (and 95% similar in translated amino acid sequence) to the quanylytransferase gene of the Scylla serrata reovirus (SsRV). The insert of CsRV-28 was labeled with digoxigenin-11-dUTP and hybridized to sections of hepatopancreas and gill of infected C. sapidus, this probe reacted to hemocytes and cells in the connective tissue. No reaction was seen in any of the tissues prepared from uninfected crabs. Thus, this in situ hybridization procedure can be used to diagnose CsRV. Copyright © 2011 Elsevier Inc. All rights reserved.

  8. The Atlantic blue crab Callinectes sapidus in southern European coastal waters: Distribution, impact and prospective invasion management strategies.

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    Mancinelli, Giorgio; Chainho, Paula; Cilenti, Lucrezia; Falco, Silvia; Kapiris, Kostas; Katselis, George; Ribeiro, Filipe

    2017-06-15

    The native distribution of the blue crab Callinectes sapidus in the western Atlantic extends from Nova Scotia to Argentina. Introduced to Europe at the beginning of the 20th century, it is currently recorded almost ubiquitously in the Mediterranean and in the Black Sea. An overview of the occurrence, abundance, and ecological impact of the species in southern European waters is provided; additionally, we present a pragmatic assessment of its management scenarios, explicitly considering the dual nature of C. sapidus as both an invasive species and a fishery resource. We emphasise that the ongoing expansion of C. sapidus in the region may represent a stimulating challenge for the identification and implementation of future strategies in the management of invasive crustaceans. The impact of the invader could be converted into an enhancement of the services delivered by southern European coastal ecosystems, while mitigation costs could be transformed into profits for local populations. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. The Influence of Diet Composition on Fitness of the Blue Crab, Callinectes sapidus.

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    Benjamin A Belgrad

    Full Text Available The physiological condition and fecundity of an organism is frequently controlled by diet. As changes in environmental conditions often cause organisms to alter their foraging behavior, a comprehensive understanding of how diet influences the fitness of an individual is central to predicting the effect of environmental change on population dynamics. We experimentally manipulated the diet of the economically and ecologically important blue crab, Callinectes sapidus, to approximate the effects of a dietary shift from primarily animal to plant tissue, a phenomenon commonly documented in crabs. Crabs whose diet consisted exclusively of animal tissue had markedly lower mortality and consumed substantially more food than crabs whose diet consisted exclusively of seaweed. The quantity of food consumed had a significant positive influence on reproductive effort and long-term energy stores. Additionally, seaweed diets produced a three-fold decrease in hepatopancreas lipid content and a simultaneous two-fold increase in crab aggression when compared to an animal diet. Our results reveal that the consumption of animal tissue substantially enhanced C. sapidus fitness, and suggest that a dietary shift to plant tissue may reduce crab population growth by decreasing fecundity as well as increasing mortality. This study has implications for C. sapidus fisheries.

  10. The Influence of Diet Composition on Fitness of the Blue Crab, Callinectes sapidus.

    Science.gov (United States)

    Belgrad, Benjamin A; Griffen, Blaine D

    2016-01-01

    The physiological condition and fecundity of an organism is frequently controlled by diet. As changes in environmental conditions often cause organisms to alter their foraging behavior, a comprehensive understanding of how diet influences the fitness of an individual is central to predicting the effect of environmental change on population dynamics. We experimentally manipulated the diet of the economically and ecologically important blue crab, Callinectes sapidus, to approximate the effects of a dietary shift from primarily animal to plant tissue, a phenomenon commonly documented in crabs. Crabs whose diet consisted exclusively of animal tissue had markedly lower mortality and consumed substantially more food than crabs whose diet consisted exclusively of seaweed. The quantity of food consumed had a significant positive influence on reproductive effort and long-term energy stores. Additionally, seaweed diets produced a three-fold decrease in hepatopancreas lipid content and a simultaneous two-fold increase in crab aggression when compared to an animal diet. Our results reveal that the consumption of animal tissue substantially enhanced C. sapidus fitness, and suggest that a dietary shift to plant tissue may reduce crab population growth by decreasing fecundity as well as increasing mortality. This study has implications for C. sapidus fisheries.

  11. Evaluation and management of blue crab Callinectes sapidus (Rathbun, 1896 (Decapoda - Portunidae fishery in the Estuary of Cananéia, Iguape and Ilha Comprida, São Paulo, Brazil

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    JT. Mendonça

    Full Text Available The Estuary of Cananéia, Iguape and Ilha Comprida is a part of the Estuarine Lagoon System of Cananéia, Iguape and Paranaguá , on the south coast of São Paulo State, Brazil. It has been recognised for its high standards of environmental conservation. The objective of this paper was to assess the blue crab (Callinectes sapidus fishing in the region, from January 1998 to December 2006, and obtain supportive data to implement technical rules for the rational exploitation and resulting conservation of this resource. The results show a remarkable decrease in the fisheries' abundance index (CPUE up to 2005, from 9.4 to 4.0 kg/hour, mainly caused by an increase in fishing effort, from 1,960 to 13,776 hours on a yearly basis. With the decrease in the fishing effort in 2005 and 2006, the abundance index reacted positively, indicating a recovery of the exploited population. Due to the lack of appropriate regulation limiting the fishing effort and organising the fluctuating admission rates of new fishermen, there is a noticeable increase of the effort, above the sustainable level. Therefore, there is a need for measures to limit and control the admission of fishermen in this activity. One of the measures to be considered is the establishment of regular periods where fishing the species is prohibited (called "defeso", each year, especially from September to January. Another measure is to create a fishermen registry and special licenses, to limit the number of new entrants. Such actions require, for their implementation, a co-managed initiative, involving the blue crab fishermen themselves, governmental agencies and resource management researchers, and the integration of ecological, socioeconomic and cultural dimensions.

  12. Toxicity of the dispersant Corexit 9500 to early life stages of blue crab, Callinectes sapidus.

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    Anderson Lively, Julie A; McKenzie, Jon

    2014-12-01

    The Deepwater Horizon well released 4.4 million barrels of light crude oil offshore of Louisiana into one of the world's largest and most productive blue crab (Callinectes sapidus) fisheries. The objectives of this paper were to determine the toxicity of the dispersant Corexit(®) 9500A used in the 2010 oil spill on juvenile and larval blue crabs, and the long-term effects of sublethal acute exposure. Only the highest treatment levels of dispersant significantly increased mortality in larval and juvenile blue crabs (100 mg/L and 1,000 mg/L, respectively). This correlated to concentrations well above levels found in the Gulf of Mexico following the spill. Smaller and younger crabs showed higher mortality than older and larger crabs. This research indicates direct application of dispersants on crab larvae could cause acute mortality, but dilution through diffusion and natural weathering processes would minimize long-term effects.

  13. Evaluation of parenteral drugs for anesthesia in the blue crab (Callinectes sapidus).

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    Quesada, Rolando J; Smith, Christopher D; Heard, Darryl J

    2011-06-01

    The objective of this study was to evaluate the efficacy and safety of several parenteral anesthetics in blue crabs (Callinectes sapidus). Thirty-one animals were administered one or more of the following drugs by injection into the hemolymph (i.v.) through an arthrodial membrane: etomidate, ketamine, lidocaine, pentobarbital, propofol, tiletamine-zolazepam, xylazine, and ketamine-xylazine. A subset of crabs received intracardiac ketamine. Etomidate had no effect. Lidocaine effects were ultrashort (sapidus as well as in other crab species.

  14. Predation of the ribbed mussel geukensia demissa by the blue crab callinectes sapidus

    Science.gov (United States)

    Seed, R.

    Callinectes sapidus fed extensively on Geukensia demissa in laboratory aquaria. Several predation techniques used by Callinectes to open its prey are reported. Prey value decreases monotonically with increasing mussel size. Crabs consumed mussels over a wide size range but were generally reluctant to feed on larger mussels whilst smaller, more profitably prey was available. The relative importance of 'energy maximization' and 'time minimization' could not be distinguished. The distribution and population structure of Geukensia at Beaufort, N. Carolina are briefly considered in terms of the foraging strategy of Callinectes.

  15. TROPHIC ACCUMULATION AND DEPURATION OF MERCURY BY BLUE CRABS (CALLINECTES SAPIDUS) AND PINK SHRIMP (PENAEUS DUORARUM).

    Science.gov (United States)

    Mercury concentrations in blue crabs (Callinectes sapidus) collected from an area of mercury-contaminated sediments in Lavaca Bay, TX, USA, are more than an order of magnitude greater than concentrations in penaeid shrimp from the same area. Laboratory feeding experiments using ...

  16. Influence of salinity on toxicity of cadmium and chromium to the blue crab, Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Frank, P.M.; Robertson, P.B.

    1979-01-01

    This study reports the lethal concentrations of cadmium and chromium to juvenile blue crabs, Callinectes sapidus, in acute toxicity tests at three different salinities. This economically important crustacean ranges throughout estuaries from fresh water to marine salinities, and may be subject to heavy metal pollution in industrial areas.

  17. First Record of Blue Crab Callinectes sapidus (Rathbun 1896 from the Middle Black Sea Coast

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    Mehmet AYDIN

    2017-12-01

    Full Text Available Two individuals of blue crab Callinectes sapidus (one male and one female were captured by trammel nets on 27 November 2017 and 1 December 2017 between 2 m to 10 m depths from the middle Black Sea coast. The carapace width and weight were measured as 19.4 cm and 449.19 g for the male, and 19.6 cm and 269.39 g for the female specimens. This is the first record for the C. sapidus from the middle Black Sea region.

  18. High Connectivity among Blue Crab (Callinectes sapidus) Populations in the Western South Atlantic.

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    Lacerda, Ana Luzia Figueiredo; Kersanach, Ralf; Cortinhas, Maria Cristina Silva; Prata, Pedro Fernandes Sanmartin; Dumont, Luiz Felipe Cestari; Proietti, Maíra Carneiro; Maggioni, Rodrigo; D'Incao, Fernando

    2016-01-01

    Population connectivity in the blue crab Callinectes sapidus was evaluated along 740 km of the Western South Atlantic coast. Blue crabs are the most exploited portunid in Brazil. Despite their economic importance, few studies report their ecology or population structure. Here we sampled four estuarine areas in southern Brazil during winter 2013 and summer 2014 in order to evaluate diversity, gene flow and structure of these populations. Nine microsatellite markers were evaluated for 213 adult crabs, with identification of seven polymorphic loci and 183 alleles. Pairwise FST values indicated low population structure ranging from -0.00023 to 0.01755. A Mantel test revealed that the geographic distance does not influence genetic (r = -0.48), and structure/migration rates confirmed this, showing that even the populations located at the opposite extremities of our covered region presented low FST and exchanged migrants. These findings show that there is a significant amount of gene flow between blue crab populations in South Brazil, likely influenced by local current dynamics that allow the transport of a high number of larvae between estuaries. Considering the elevated gene flow, the populations can be considered a single genetic stock. However, further information on population size and dynamics, as well as fishery demands and impacts at different regions, are necessary for harvest management purposes.

  19. High Connectivity among Blue Crab (Callinectes sapidus Populations in the Western South Atlantic.

    Directory of Open Access Journals (Sweden)

    Ana Luzia Figueiredo Lacerda

    Full Text Available Population connectivity in the blue crab Callinectes sapidus was evaluated along 740 km of the Western South Atlantic coast. Blue crabs are the most exploited portunid in Brazil. Despite their economic importance, few studies report their ecology or population structure. Here we sampled four estuarine areas in southern Brazil during winter 2013 and summer 2014 in order to evaluate diversity, gene flow and structure of these populations. Nine microsatellite markers were evaluated for 213 adult crabs, with identification of seven polymorphic loci and 183 alleles. Pairwise FST values indicated low population structure ranging from -0.00023 to 0.01755. A Mantel test revealed that the geographic distance does not influence genetic (r = -0.48, and structure/migration rates confirmed this, showing that even the populations located at the opposite extremities of our covered region presented low FST and exchanged migrants. These findings show that there is a significant amount of gene flow between blue crab populations in South Brazil, likely influenced by local current dynamics that allow the transport of a high number of larvae between estuaries. Considering the elevated gene flow, the populations can be considered a single genetic stock. However, further information on population size and dynamics, as well as fishery demands and impacts at different regions, are necessary for harvest management purposes.

  20. Comparison of Three Different Traps for Catching Blue Crab (Callinectes sapidus Rathbun 1896) in Beymelek Lagoon

    OpenAIRE

    ATAR, Hasan Hüseyin

    2014-01-01

    In this study, the capture efficiencies and catch rates of three different traps were compared for the blue crab Callinectes sapidus in Beymelek Lagoon, Antalya, Turkey. All gear was used simultaneously and in the same habitats. The mean catch per unit effort (CPUE) was determined to be significantly higher for hoop nets than for traps. Gear effectiveness was examined by comparing CPUE (CPUE as number of crab per trap per haul, and g per trap haul), mean weight of individual crabs, catch comp...

  1. Sublethal Toxicity of Crude Oil Exposure in The Blue Crab, Callinectes sapidus, at Two Life History Stages.

    Science.gov (United States)

    Giltz, Sarah M; Taylor, Caz M

    2017-02-01

    The 2010 Deepwater Horizon oil spill occurred during peak spawning season for many Gulf of Mexico fish and invertebrates. Early life stages of important fishery species were at risk to encounter crude oil. In this study, we investigated the effect of crude oil exposure on two life stages of the blue crab (Callinectes sapidus). We tested the effects of oil exposure on the survival and growth of larval (pelagic) and juvenile (estuarine) blue crabs as well as the effects of oil on the molt frequency of juveniles. Larval crabs exposed to crude oil showed no discernable growth or mortality differences when compared to non-exposed controls. Juvenile crabs exposed to oil also showed no differences in size but exhibited increased intermolt duration (time between molts). Our study suggests that different life-stages may respond differently when exposed to crude oil and that oil exposure negatively affects growth rate of juvenile blue crabs.

  2. Blue crabs Callinectes sapidus as potential biological reservoirs for white spot syndrome virus (WSSV).

    Science.gov (United States)

    Powell, James W B; Browdy, Craig L; Burge, Erin J

    2015-03-09

    White spot syndrome virus (WSSV) is a virulent pathogen of cultured shrimp and was first detected in farms in South Carolina (USA) in 1997 and subsequently in wild shrimp in 1999. We screened groups of 1808 wild Atlantic white shrimp Litopenaeus setiferus and 300 blue crabs Callinectes sapidus collected from South Carolina, Georgia, and Florida for the presence of WSSV using the Shrimple® immunoassay-strip test, with all positives and random subsets of negatives tested by TaqMan real-time PCR and in infectivity bioassays. Of 87 shrimp and 11 crabs that tested positive using the Shrimple® test, only a single C. sapidus was confirmed to be infected with WSSV by PCR and the infectivity bioassay. The data indicate that the prevalence of WSSV in these species is low in these southeastern US regions, but that C. sapidus may serve as a biological reservoir.

  3. A Lethal Virus of the Blue Crab Callinectes sapidus May Be Present Throughout its Trans-hemispheric Range

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    Schott, E. J.; Flowers, E. M.; Vinagre, A.; Brown, S.; Almeida, A.

    2016-02-01

    Blue crabs, Callinectes sapidus, are key epibenthic predators and support valuable fisheries throughout North and South America. On both continents, they are also used to produce soft shell crabs, a value added product. On the Atlantic coast of the USA, mortality of blue crabs in soft shell production is often 25% or greater. A majority of those crabs have been found to be infected with a reovirus lethal to blue crabs. The CsRV1 virus infects multiple ectodermal and mesodermal tissues and was first described as RLV (reo-like virus) in the late 1970s. However its potential for affecting large numbers of crabs was not fully recognized until 2010 when molecular methods were developed to study its prevalence in aquaculture and the wild. Using a sensitive Rt-qPCR assay for the virus, a multi-year survey of crabs from the mid-Atlantic USA coast and Chesapeake Bay revealed that approximately 20% of adult and juvenile crabs were positive for CsRV1 genomic RNA. If blue crabs in the wild die from CsRV1 infections as rapidly as captive infected crabs, it suggests that significant numbers of wild blue crabs die from CsRV1 infections. Crab fishery managers in the Chesapeake Bay recently recognized that there is a need to better understand the role of diseases in natural mortality. The CsRV1 virus is found in C. sapidus throughout the USA range, and has been discovered in diseased Brazilian C. sapidus from Rio Grande do Sul. Genetic analysis of the virus shows that strains of CsRV1 found in Brazil are distinct from the strains identified in the USA. This pan-hemispheric range suggests that the virus has long been a component of blue crab ecology. Much more study is needed to understand the history and impacts of CsRV1 throughout the USA, Brazil, and the vast coastline in between.

  4. Analysis of metals in blue crabs, Callinectes sapidus, from two Connecticut estuaries

    Energy Technology Data Exchange (ETDEWEB)

    Jop, K.M. [Sciences Applications International Corp., Narragansett, RI (United States); Biever, R.C.; Hoberg, J.R.; Shepherd, S.P. [Springborn Labs., Inc., Wareham, MA (United States)

    1997-02-01

    Decisions involving the use and allocation of resources in the nation`s coastal and estuarine regions require reliable and continuous information about the status and trends of environmental quality in those areas. In recent years much attention has been focused on assessing environmental risks resulting from the manufacture, distribution, use and disposal of chemicals. Legislation and public concern have produced numerous regulations concerning the introduction of chemicals into surface waters which increase the potential for human exposure. There is considerable concern about the human health aspects of metal cycling especially in coastal and inland waters that are in proximity to large populations or industrial centers. Many of these compounds tend to remain in the ecosystem and eventually move from lower to higher trophic levels within the human food chain. Blue crabs, Callinectes sapidus Rathbun, are important members of the estuarine food chain due to high abundance and their multiple role as scavengers, predators and prey. Because of their omnivorous feeding characteristics and association with sediments, blue crabs are exposed and may potentially accumulate significant amount of pollutants above background seawater concentrations. This species represents one of the most valuable fishery resources in the southern states. According to Marcus and Mathews blue crabs ranked fifth in 1984 and fourth in 1985 behind shrimp, swordfish, oysters and hard clams in economic value, but first in total weight for both years in South Carolina. Although in Connecticut blue crabs are harvested mostly for personal consumption, their commercial value in other states makes the results from any environmental survey of great interest from the consideration of risk to human health. This study evaluated the level of contaminants in Blue crabs in the summer months by examining the concentration of selected metals in samples of muscle and hepatopancreas tissue. 12 refs., 3 tabs.

  5. Amino Acid Composition of Blue Crab (Callinectes sapidus) from the North Eastern Mediterranean Sea

    OpenAIRE

    KÜÇÜKGÜLMEZ, Aygül; ÇELIK, Mehmet

    2008-01-01

    The amino acid composition in tissues (claw, breast meats and hepatopancreas) of the blue crabs (Callinectes sapidus, RATHBUN, 1896), caught off the North Eastern Mediterranean Sea (Turkey) were investigated. The amounts of the amino acid contents of the claw, breast meat and hepatopancreas of the blue crab were found to be significantly different. Glutamic acid was major amino acid in all parts of the blue crab. The total essential amino acids ranged from 7.24 to 7.83 g/ 100 g fresh wt. The ...

  6. First occurrence of Callinectes sapidus (Rathbun, 1896) within the Sacca di Goro (Italy) and surroundings

    OpenAIRE

    Manfrin, Chiara; Turolla, Edoardo; Chung, J.; Giulianini, Piero

    2015-01-01

    The Sacca di Goro lagoon is an area located in the northern part of Italy. This locality has benefited in the past of an occasional and later the planned introduction of the Manila clam. Nowadays it produces more than 50% of the entire Italian clam production. Recently the crab Callinectes sapidus has been spotted and reported a few months ago on its female carrying eggs. This may signify the complete acclimation of this species in the Sacca di Goro lagoon and a potential ongoing spread to su...

  7. Synopsis of biological data on the blue crab, Callinectes sapidus Rathbun

    OpenAIRE

    Millikin, Mark R.; Williams, Austin B.

    1984-01-01

    This synopsis reviews taxonomy, morphology, distribution, life history, commercial hard and soft shell crab fisheries, physiology, diseases, ecology, laboratory culture methodology, and influences of environmental pollutants on the blue crab, Callinecles sapidus. Over 300 selected, published reports up to and including 1982 are covered. (PDF file contains 45 pages.)

  8. Evaluation of Blue Crab, Callinectes sapidus, Megalopal Settlement and Condition during the Deepwater Horizon Oil Spill

    Science.gov (United States)

    Grey, Erin K.; Chiasson, Susan C.; Williams, Hannah G.; Troeger, Victoria J.; Taylor, Caz M.

    2015-01-01

    The Blue Crab, Callinectes sapidus, is a commercially, culturally, and ecologically significant species in the Gulf of Mexico (GOM), whose offshore stages were likely impacted by the Deepwater Horizon oil spill (DWH). To test for DWH effects and to better understand the planktonic ecology of this species, we monitored Callinectes spp. megalopal settlement and condition at sites within and outside of the spill extent during and one year after the DWH. We tested for DWH effects by comparing 2010 settlement against baseline data available for two sites, and by testing for differences in settlement and condition inside and outside of the spill extent. We also developed time series models to better understand natural drivers of daily settlement variation (seasonal and lunar trends, hydrodynamics, wind) during 2010 and 2011. Overall, we found that neither megalopal settlement nor body weight were significantly reduced at oiled sites, but that high unexplained variation and low statistical power made detection of even large effects unlikely. Time series models revealed remarkably consistent and relatively strong seasonal and lunar trends within sites (explaining on average 28% and 9% of variation, respectively), while wind and hydrodynamic effects were weak (1–5% variation explained) and variable among sites. This study provides insights into DWH impacts as well as the natural drivers of Callinectes spp. megalopal settlement across the northern GOM. PMID:26270970

  9. Evaluation of Blue Crab, Callinectes sapidus, Megalopal Settlement and Condition during the Deepwater Horizon Oil Spill.

    Science.gov (United States)

    Grey, Erin K; Chiasson, Susan C; Williams, Hannah G; Troeger, Victoria J; Taylor, Caz M

    2015-01-01

    The Blue Crab, Callinectes sapidus, is a commercially, culturally, and ecologically significant species in the Gulf of Mexico (GOM), whose offshore stages were likely impacted by the Deepwater Horizon oil spill (DWH). To test for DWH effects and to better understand the planktonic ecology of this species, we monitored Callinectes spp. megalopal settlement and condition at sites within and outside of the spill extent during and one year after the DWH. We tested for DWH effects by comparing 2010 settlement against baseline data available for two sites, and by testing for differences in settlement and condition inside and outside of the spill extent. We also developed time series models to better understand natural drivers of daily settlement variation (seasonal and lunar trends, hydrodynamics, wind) during 2010 and 2011. Overall, we found that neither megalopal settlement nor body weight were significantly reduced at oiled sites, but that high unexplained variation and low statistical power made detection of even large effects unlikely. Time series models revealed remarkably consistent and relatively strong seasonal and lunar trends within sites (explaining on average 28% and 9% of variation, respectively), while wind and hydrodynamic effects were weak (1-5% variation explained) and variable among sites. This study provides insights into DWH impacts as well as the natural drivers of Callinectes spp. megalopal settlement across the northern GOM.

  10. Evaluation of Blue Crab, Callinectes sapidus, Megalopal Settlement and Condition during the Deepwater Horizon Oil Spill.

    Directory of Open Access Journals (Sweden)

    Erin K Grey

    Full Text Available The Blue Crab, Callinectes sapidus, is a commercially, culturally, and ecologically significant species in the Gulf of Mexico (GOM, whose offshore stages were likely impacted by the Deepwater Horizon oil spill (DWH. To test for DWH effects and to better understand the planktonic ecology of this species, we monitored Callinectes spp. megalopal settlement and condition at sites within and outside of the spill extent during and one year after the DWH. We tested for DWH effects by comparing 2010 settlement against baseline data available for two sites, and by testing for differences in settlement and condition inside and outside of the spill extent. We also developed time series models to better understand natural drivers of daily settlement variation (seasonal and lunar trends, hydrodynamics, wind during 2010 and 2011. Overall, we found that neither megalopal settlement nor body weight were significantly reduced at oiled sites, but that high unexplained variation and low statistical power made detection of even large effects unlikely. Time series models revealed remarkably consistent and relatively strong seasonal and lunar trends within sites (explaining on average 28% and 9% of variation, respectively, while wind and hydrodynamic effects were weak (1-5% variation explained and variable among sites. This study provides insights into DWH impacts as well as the natural drivers of Callinectes spp. megalopal settlement across the northern GOM.

  11. Toxicity of the organophosphate insecticide fenitrothion and its metabolism by blue crabs, Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Johnston, J.J.

    1986-01-01

    The LC/sub 50/ for Callinectes sapidus exposed to fenitrothion for 96 hours at 22/sup 0/C and a salinity of 34 ppt (parts per thousand) was estimated to be 8.6 ..mu..g/liter. Acute toxicity was shown to decrease with decreasing salinity and decreasing temperature. Exposure to a simulated tidal cycle increased the acute toxicity of fenitrothion to Callinectes. The autotomization response in Callinectes was shown to be affected at subacute exposure levels as low as 0.1 ..mu..g/liter. In vitro studies showed that the rates of formation of 3-methyl-4-nitrophenol and desmethyl fenitrothion were greater and the rate of formation of fenitrooxon was less in subcellular fractions prepared from the hepatopancreas of crabs which had been acclimated to lower salinity seawater. All three of these metabolites were formed at faster rates in subcellular fractions prepared from crabs which had been acclimated to and incubated at 22/sup 0/C than at 17/sup 0/C. Tissue distribution of aniline hydroxylase and glutathione-S-transferase activity was also determined. The uptake of /sup 14/C-fenitrothion at a level in a seawater of 5.2 ..mu..g/liter was greater at 22/sup 0/C than at 17/sup 0/C and from 34 ppt than from 17 ppt seawater. Tissue distribution of radioactivity was determined as well as the nature of radiolabelled metabolites in the hepatopancreas and in seawater. There was no significant difference in the overall level of metabolites detected in the 22/sup 0/C than in the 17/sup 0/C seawater. The rate of uptake of fenitrothion by Callinectes also affects the toxicity as the uptake of fenitrothion was more rapid at the higher salinity as well as at the higher temperature.

  12. Grooming behaviors and gill fouling in the commercially important blue crab (Callinectes sapidus and stone crab (Menippe mercenaria

    Directory of Open Access Journals (Sweden)

    Jen L. Wortham

    2017-10-01

    Full Text Available Abstract Grooming behaviors reduce fouling of body regions. In decapods, grooming time budgets, body regions groomed, and grooming appendages are known in several species; however, little data exists on brachyuran crabs. In this study, grooming behaviors of two commercially important crabs were documented (blue crabs: Callinectes sapidus Rathbun, 1896; stone crabs: Menippe mercenaria Say, 1818. These crabs are harvested by fishermen and knowing their grooming behaviors is valuable, as clean crabs are preferred by consumers and the stone crab fishery consequence of removing one cheliped to grooming behaviors is unknown. Crabs were observed individually and agonistically to determine how grooming behaviors vary in the presence of another conspecific. Both species frequently use their maxillipeds and groom, with the gills being cleaned by epipods. Respiratory and sensory structures were groomed frequently in both species. Removal of a grooming appendage resulted in higher fouling levels in the gills, indicating that grooming behaviors do remove fouling. Overall, stone crabs had a larger individual time budget for grooming, but agonistic grooming time budgets were similar. Stone crab chelipeds are used in grooming, especially cleaning the other cheliped. The chelipeds are not the main grooming appendage; however, implications of losing one cheliped may have large impacts.

  13. A new PCR-based method shows that blue crabs (Callinectes sapidus (Rathbun)) consume winter flounder (Pseudopleuronectes americanus (Walbaum)).

    Science.gov (United States)

    Collier, Jackie L; Fitzgerald, Sean P; Hice, Lyndie A; Frisk, Michael G; McElroy, Anne E

    2014-01-01

    Winter flounder (Pseudopleuronectes americanus) once supported robust commercial and recreational fisheries in the New York (USA) region, but since the 1990s populations have been in decline. Available data show that settlement of young-of-the-year winter flounder has not declined as sharply as adult abundance, suggesting that juveniles are experiencing higher mortality following settlement. The recent increase of blue crab (Callinectes sapidus) abundance in the New York region raises the possibility that new sources of predation may be contributing to juvenile winter flounder mortality. To investigate this possibility we developed and validated a method to specifically detect winter flounder mitochondrial control region DNA sequences in the gut contents of blue crabs. A survey of 55 crabs collected from Shinnecock Bay (along the south shore of Long Island, New York) in July, August, and September of 2011 showed that 12 of 42 blue crabs (28.6%) from which PCR-amplifiable DNA was recovered had consumed winter flounder in the wild, empirically supporting the trophic link between these species that has been widely speculated to exist. This technique overcomes difficulties with visual identification of the often unrecognizable gut contents of decapod crustaceans, and modifications of this approach offer valuable tools to more broadly address their feeding habits on a wide variety of species.

  14. A new PCR-based method shows that blue crabs (Callinectes sapidus (Rathbun consume winter flounder (Pseudopleuronectes americanus (Walbaum.

    Directory of Open Access Journals (Sweden)

    Jackie L Collier

    Full Text Available Winter flounder (Pseudopleuronectes americanus once supported robust commercial and recreational fisheries in the New York (USA region, but since the 1990s populations have been in decline. Available data show that settlement of young-of-the-year winter flounder has not declined as sharply as adult abundance, suggesting that juveniles are experiencing higher mortality following settlement. The recent increase of blue crab (Callinectes sapidus abundance in the New York region raises the possibility that new sources of predation may be contributing to juvenile winter flounder mortality. To investigate this possibility we developed and validated a method to specifically detect winter flounder mitochondrial control region DNA sequences in the gut contents of blue crabs. A survey of 55 crabs collected from Shinnecock Bay (along the south shore of Long Island, New York in July, August, and September of 2011 showed that 12 of 42 blue crabs (28.6% from which PCR-amplifiable DNA was recovered had consumed winter flounder in the wild, empirically supporting the trophic link between these species that has been widely speculated to exist. This technique overcomes difficulties with visual identification of the often unrecognizable gut contents of decapod crustaceans, and modifications of this approach offer valuable tools to more broadly address their feeding habits on a wide variety of species.

  15. In vitro culture and developmental cycle of the parasitic dinoflagellate Hematodinium sp. from the blue crab Callinectes sapidus.

    Science.gov (United States)

    Li, Caiwen; Miller, Terrence L; Small, Hamish J; Shields, Jeffrey D

    2011-12-01

    Hematodinium is a genus of parasitic dinoflagellates whose species have caused significant mortalities in marine crustacean fisheries worldwide. A species of Hematodinium infects the blue crab, Callinectes sapidus on the eastern seaboard of the USA. The mode of transmission of the parasite in blue crabs is unknown. We established several continuous in vitro cultures of Hematodinium sp. isolated from the haemolymph of infected blue crabs. One isolate has been continuously maintained in our laboratory through serial subcultivation for over 12 months, and is capable of infecting new hosts when inoculated into healthy crabs. Cells of the parasite undergo characteristic developmental changes in vitro consistent with the identifiable stages of Hematodinium sp.: filamentous trophonts, amoeboid trophonts, arachnoid trophonts and sporonts, sporoblasts, prespores and dinospores (macrospores and microspores). Additionally, we describe an unusual shunt in the life cycle wherein presumptive schizonts derived from arachnoid sporonts developed into filamentous and arachnoid trophonts that can then initiate arachnoid sporonts in new cultures. This may explain the rapid proliferation of the parasite in blue crab hosts. We also found that temperature and light intensity affected the growth and development of the parasite in vitro.

  16. Concentration of HCB in Callinectes sapidus from the Calcasieu Estuary, Louisiana

    Energy Technology Data Exchange (ETDEWEB)

    Murray, H.E.; Murphy, C.N.; Gaston, G.R. (McNeese State Univ., Lake Charles, LA (United States))

    1992-01-01

    Blue crabs (Callinectes sapidus) were collected from several areas in the estuary, and edible tissues were analyzed for the organic compound hexachlorobenzene (HCB). Hexachlorobenzene was established as an indicator of industrial chemical contamination by the Louisiana Department of Health and Hospitals (LDHH). This organization used the FDA interim guideline concentration of 0.5 ppm HCB in fatty tissue of beef to develop an emergency action level of 0.060 ppm for edible seafood. In this study, an average HCB tissue concentration of 40 ppb was found in the Calcasieu Estuary. There was no significant difference in concentrations between sampling locations. However, the range in HCB concentrations varied among samples, with some analyses yielding tissue concentrations greater than the emergency action level of 60 ppb.

  17. Cadmium-binding proteins from blue crabs (Callinectes sapidus) environmentally exposed to cadmium

    Energy Technology Data Exchange (ETDEWEB)

    Wiedow, M.A.; Kneip, T.J.; Garte, S.J.

    1982-06-01

    Two heat-stable (90/sup 0/C) cadmium-binding proteins were isolated from the hepatopancreas of Hudson River blue crabs (Callinectes sapidus) by Sephadex G-75 gel filtration chromatography. These proteins have molecular weights of 10,600 and 9,400, and ultraviolet absorbance ratios at 250/280 nm of 12.4 and 5.4, respectively. Repeated freezing and thawing and prolonged (3-6 weeks) storage resulted in protein degradation or loss of Cd-binding activity. These proteins were induced by laboratory injection of CdCl/sub 2/ in blue crabs from pristine (Chesapeake Bay) areas; however, injection of CdCl/sub 2/ into Hudson River animals yielded anomalous chromatography profiles. Cadmium-binding proteins were also identified in blue crab thoracic muscle and gill. The possibility is discussed that these proteins are a type of metallothionein and could contribute to the human toxicity of this cadmium-contaminated edible crustacean.

  18. Detailed Spectroscopic Study of the Role of Br and Sr in Coloured Parts of the Callinectes Sapidus Crab Claw

    OpenAIRE

    Katsikini, Maria

    2016-01-01

    The exoskeleton of crustaceans consists mainly of calcium carbonate (CaCO$_3$) minerals and in many cases exhibits vivid colouration due to the presence of proteins rich in carotenoid chromophores. The exposure of aquatic animals in sea water results often in the incorporation of trace elements in their exoskeleton. The bonding configuration of Br and Sr trace elements in regions with different staining (white, orange and blue) of the exoskeleton of the Callinectes sapidus in crab claw are sy...

  19. Effects of molting on the visual acuity of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Baldwin, Jamie; Johnsen, Sönke

    2011-09-15

    In crustaceans with compound eyes, the corneal lens of each facet is part of the exoskeleton and thus shed during molting. Here we used an optomotor assay to evaluate the impact of molting on visual acuity (as measured by the minimum resolvable angle, α(min)) in the female blue crab, Callinectes sapidus. We found that visual acuity decreases substantially in the days prior to molting and is gradually recovered after molting. Four days prior to molting, α(min) was 1.8 deg (N=5), a value approximating the best possible acuity in this species. In the 24 h before ecdysis occurred, α(min) increased to 15.0 deg (N=12), corresponding to an eightfold drop in visual acuity. Within 6 days after molting, α(min) returned to the pre-molting value. Micrographs of C. sapidus eyes showed that a gap between the corneal lens and the crystalline cone first appeared approximately 5 days prior to shedding and increased in width as the process progressed. This separation was likely responsible for the loss of visual acuity observed in behavioral tests. In blue crabs, mating is limited to the period of the female's pubertal molt, and a reduction in acuity during this time may have an effect on the sensory cues used in female mate choice. The results described here may be broadly applicable to all arthropods that molt and have particular importance for crustaceans that molt multiple times in their lifetime or have mating cycles that are paired with molting.

  20. The importance of color in mate choice of the blue crab Callinectes sapidus.

    Science.gov (United States)

    Baldwin, Jamie; Johnsen, Sönke

    2009-11-01

    Visual displays often play a large role in animal communication, particularly in sexual interactions. The blue crab Callinectes sapidus is both colorful and highly visually responsive, yet almost all studies of their courtship have focused on chemical cues. In the blue crab's underwater environment, however, visual cues may function more rapidly and over a longer distance than chemical cues. Given that blue crabs are aggressive and cannibalistic, visual cues may therefore allow blue crabs to quickly evaluate potential mates from safer distances. In the present study we show that courtship and mate choice behavior in C. sapidus can be stimulated by visual cues alone. Further, we show that males have a preference for females with red claw dactyls. In binary choice experiments, males displayed more often to photographs of females with red claws than to those with white claws or to those with black claws that were isoluminant to the red ones. This strongly suggests that male blue crabs made their choices based on the hue of the red claws, further suggesting that blue crabs are capable of color vision and use color in mate choice.

  1. Properties of bacteria that trigger hemocytopenia in the Atlantic blue crab, Callinectes sapidus.

    Science.gov (United States)

    Johnson, Nathaniel G; Burnett, Louis E; Burnett, Karen G

    2011-10-01

    In the blue crab Callinectes sapidus, injection with the bacterial pathogen Vibrio campbellii causes a decrease in oxygen consumption. Histological and physiological evidence suggests that the physical obstruction of hemolymph flow through the gill vasculature, caused by aggregations of bacteria and hemocytes, underlies the decrease in aerobic function associated with bacterial infection. We sought to elucidate the bacterial properties sufficient to induce a decrease in circulating hemocytes (hemocytopenia) as an indicator for the initiation of hemocyte aggregation and subsequent impairment of respiration. Lipopolysaccharide (LPS), the primary component of the gram-negative bacterial cell wall, is known to interact with crustacean hemocytes. Purified LPS was covalently bound to the surfaces of polystyrene beads resembling bacteria in size. Injection of these "LPS beads" caused a decrease in circulating hemocytes comparable to that seen with V. campbellii injection, while beads alone failed to do so. These data suggest that in general, gram-negative bacteria could stimulate hemocytopenia. To test this hypothesis, crabs were injected with different bacteria--seven gram-negative and one gram-positive species--and their effects on circulating hemocytes were assessed. With one exception, all gram-negative strains caused decreases in circulating hemocytes, suggesting an important role for LPS in the induction of this response. However, LPS is not necessary to provoke the immune response given that Bacillus coral, a gram-positive species that lacks LPS, caused a decrease in circulating hemocytes. These results suggest that a wide range of bacteria could impair metabolism in C. sapidus.

  2. Effects of soluble fractions of drilling fluids on development of crabs, Rhithropanopeus harrisii and Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Bookhout, C.G.; Monroe, R.J.; Forward, R.B. Jr.; Costlow, J.D. Jr.

    1984-01-01

    The mud aqueous fraction (MAF) and suspended particulate phase (SPP) of low-density lignosulfonate type mud with ferrochrome added were nontoxic to larvae during the complete larval development of Rhithropanopeus harrisii. Five percent (5000 ppm, 0.5 v/v mud in water) MAF and SPP were not toxic to Callinectes sapidus. Survival of C. sapidus larvae decreased as concentrations of MAF and SPP increased from 5% (5000 ppm, 0.5 v/v mud in water) to 50% (50,000 ppm, 5% v/v mud in water). No larvae reached the 1st crab stage in 100% (100,000 ppm, 10% v/v mud in water) MAF and SPP. Statistical analysis of the data on survival, mortality, and behavior are presented. Blue crab larval behavior is affected by exposure to MAF and SPP with the general effect being a decline in swimming speed. A significant reduction was only observed in 100% MAF but was noticed in 5, 25, 50, and 100% SPP.

  3. Chelal Characteristics and Foraging Behaviour of the Blue Crab Callinectes sapidusRathbun

    Science.gov (United States)

    Seed, R.; Hughes, R. N.

    1997-02-01

    This paper describes the morphological and mechanical characteristics of the chelae of Callinectes sapidus, together with the predation techniques, handling times and prey size selection of this voracious predator when presented with marsh mussels, Geukensia demissa, or fiddler crabs, Uca pugilator, in laboratory aquaria. Callinectes sapidusis heterochelous but differences in claw size and mechanical advantage between male and female crabs are statistically indistinguishable. Handling times for mussels and fiddler crabs increased steeply with prey size. Fiddler crabs are intrinsically more profitable than mussels, but the relative costs of capturing mobile prey, or excavating mussels, in natural populations is unknown. Previous laboratory experiments investigating the key stimuli used by C. sapiduswhen selecting prey are reviewed, and their results are compared with behaviour predicted by optimal foraging theory. It is concluded that crabs respond to the strongest stimuli received from the prey. Items were rejected after a given persistence time if the attack proved unsuccessful. Persistence time, however, was adjusted through experience to expectations of local prey quality and availability. The integrated result of this key-stimulus mechanism will be a close match to diets predicted by other behavioural models, including that based on optimal foraging theory.

  4. Heavy Metals in the Blue Crab (Callinectes sapidus) in Mersin Bay, Turkey.

    Science.gov (United States)

    Çoğun, H Y; Firat, Ö; Aytekin, T; Firidin, G; Firat, Ö; Varkal, H; Temiz, Ö; Kargin, F

    2017-06-01

    The concentrations of four metals (copper, cadmium, zinc and lead) were quantified in blue crabs (Callinectes sapidus) tissues collected in January, April, June and September at two stations in Mersin Bay, northeastern Mediterranean Sea, using ICP-MS. The metal concentrations in crabs from the two stations differed significantly. The hepatopancreas was the major organ accumulating metals, followed by gill and muscle tissues. Except for lead, the highest concentrations of metals were measured in the hepatopancreas. The hepatopancreas had higher concentrations of all heavy metals (Cu 321.1 ± 4.30; Zn 182.2 ± 3.40; Cd 48.2 ± 2.00) compared to gill (Cu 90.2 ± 1.35; Zn 104.3 ± 2.30; Cd 22.3 ± 3.40) and muscle (Cu 19.1 ± 1.10; Zn 55.1 ± 3.25; Cd 2.5 ± 0.20). Among the metals analyzed, Cu, Zn and Pb were the most abundant in the different tissues while Cd was the least abundant in C. sapidus. Seasonality in the levels of the four metals was determined.The highest concentrations of all metals were observed in the June (Zn 55.1 ± 3.25; Cu 19.1 ± 1.10; Cd 2.5 ± 0.20; Pb 5.1 ± 0.18) compared to all other months (Zn 34.1 ± 3.23; Cu 11.1 ± 1.15; Cd 0.9 ± 0.20; Pb 3.1 ± 0.21).

  5. Metallothionein-like proteins in the blue crab Callinectes sapidus: effect of water salinity and ions.

    Science.gov (United States)

    De Martinez Gaspar Martins, Camila; Bianchini, Adalto

    2009-03-01

    The effect of water salinity and ions on metallothionein-like proteins (MTLP) concentration was evaluated in the blue crab Callinectes sapidus. MTLP concentration was measured in tissues (hepatopancreas and gills) of crabs acclimated to salinity 30 ppt and abruptly subjected to a hypo-osmotic shock (salinity 2 ppt). It was also measured in isolated gills (anterior and posterior) of crabs acclimated to salinity 30 ppt. Gills were perfused with and incubated in an isosmotic saline solution (ISS) or perfused with ISS and incubated in a hypo-osmotic saline solution (HSS). The effect of each single water ion on gill MTLP concentration was also analyzed in isolated and perfused gills through experiments of ion substitution in the incubation medium. In vivo, MTLP concentration was higher in hepatopancreas than in gills, being not affected by the hypo-osmotic shock. However, MTLP concentration in posterior and anterior gills significantly increased after 2 and 24 h of hypo-osmotic shock, respectively. In vitro, it was also increased when anterior and posterior gills were perfused with ISS and incubated in HSS. In isolated and perfused posterior gills, MTLP concentration was inversely correlated with the calcium concentration in the ISS used to incubate gills. Together, these findings indicate that an increased gill MTLP concentration in low salinity is an adaptive response of the blue crab C. sapidus to the hypo-osmotic stress. This response is mediated, at least in part, by the calcium concentration in the gill bath medium. The data also suggest that the trigger for this increase is purely branchial and not systemic.

  6. Silicification of the medial tooth in the blue crab Callinectes sapidus.

    Science.gov (United States)

    Nesbit, Katherine T; Roer, Robert D

    2016-12-01

    Observations of cuticular structures mineralized with silica within the Crustacea have been limited to the opal teeth of copepods, mandibles of amphipods, and recently the teeth of the gastric mill in the blue crab Callinectes sapidus. Copepod teeth are deposited during premolt, with sequential elaboration of organic materials followed by secretion of silica into the tooth mold. The timing of mineralization is in stark contrast to that of the general integument of crustaceans in which calcification is completely restricted to the postmolt period. To determine the timing of molt-related deposition and silicification of the teeth of the gastric mill, the medial tooth of the blue crab C. sapidus was examined histologically and ultrastructurally across the molt cycle. Histological data revealed deposition of the organic matrix of the epicuticle and exocuticle during premolt. No evidence of postmolt changes in the thickness of the epicuticle and exocuticle, or any deposition of endocuticle, was observed. Scanning electron microscopy revealed degradation of the outer surface of the old tooth during premolt. During premolt, epithelial structures resembling papilla appeared to secrete a fibrous web that coalesces to become the matrix of the new tooth. Semi-quantitative elemental analyses indicated simultaneous deposition of silica and organic matrix, and demonstrated a homogeneous distribution of silicon throughout the epicuticle of the tooth at all stages. However, there is evidence of deposition (presumably silicification) during postmolt as spaces between the papillae become filled in. Thus, the pattern and timing of deposition and silicification of the tooth are different from both teeth of copepods and the general exoskeleton of decapods, and may facilitate rapid resumption of feeding and consumption of the exuvia in early postmolt. J. Morphol. 277:1648-1660, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  7. Discovery of an opportunistic starfish pathogen, Orchitophrya stellarum, in captive blue crabs, Callinectes sapidus.

    Science.gov (United States)

    Small, H J; Miller, T L; Coffey, A H; Delaney, K L; Schott, E; Shields, J D

    2013-10-01

    Histophagous scuticociliate infections were discovered in blue crabs, Callinectes sapidus, held in research facilities at the Virginia Institute of Marine Science. Ciliates were observed infecting every tissue examined including the gills, heart, muscle, hepatopancreas, and epidermis. Hemolymph smears and histological tissue sections indicated a morphological similarity to Mesanophrys chesapeakensis, the only recorded histophagous ciliate infecting blue crabs. However, subsequent analysis of the ribosomal ITS region (ITS1-5.8S-ITS2) of the ciliate indicated the parasite was Orchitophrya stellarum, a parasitic ciliate previously reported infecting sea stars from Europe, Australia, and North America. A simple Polymerase Chain Reaction (PCR-RFLP) assay was developed to detect and differentiate between O. stellarum and M. chesapeakensis. Its application confirmed the presence of O. stellarum infecting blue crabs held in an additional research facility in Maryland. For growth studies, cultures of O. stellarum grew optimally on 10% blue crab serum in crustacean saline held at 10-20°C. A field survey of blue crabs collected during the winters of 2011-2012 and sea stars (Asterias forbesi) during the winter of 2010 from the Chesapeake Bay and eastern shore of Virginia did not identify additional infected individuals. Copyright © 2013 Elsevier Inc. All rights reserved.

  8. Histological Description of Gonadal Development of Females and Males of Callinectes sapidus Rathbun, 1896 (Decapoda: Portunidae).

    Science.gov (United States)

    Carvalho-Saucedo, Liliana; Ramírez-Santiago, Cecilia; Pérez, Carlos

    2015-04-01

    This paper describes the characteristics of male and female germ cells during gonadal development and the gonadal maturity scale of the blue crab, Callinectes sapidus. A total of 20 specimens were collected monthly from June to November 2012, in two areas off the coast of the Gulf of Mexico: the San Andrés Lagoon and Alvarado Lagoon. The gonads were removed and processed following the standard technique of hematoxylin and eosin staining. An important event in oogenesis (pre-vitellogenesis) was the appearance of a perinuclear vesicle in the cytoplasm and the accumulation of yolk granules. Later, vitellogenesis began and there was an accumulation of nutritive droplets and fragmentation of the perinuclear vesicle. During spermatogenesis, the accumulation of two fluids was observed that were involved in the formation of the spermatophore and the delay of spermiogenesis. Based on the histological features of gonad maturity, five stages were described (inactive, early gametogenesis, development, maturity, and resorption), in females and males. This proposal can be useful for the study of reproductive seasonality of this species.

  9. The Effects of Ocean Acidification on Predator-Prey Interactions between Mya arenaria and Callinectes sapidus

    Science.gov (United States)

    Longmire, K.; Glaspie, C.; Seitz, R.

    2016-02-01

    The study examined the implications of ocean acidification for Mya arenaria and the predator-prey dynamics between M. arenaria and Callinectes sapidus. Clams were subjected to either ambient conditions or acidified conditions and grown over four weeks. Mortality, shell lengths, and biomass (ash-free dry weights) were recorded for clams destructively sampled each week. Clams were subjected to behavioral experiments to determine their response to an approaching physical disturbance. Crabs were exposed to acidified or ambient conditions for 48 hours, and placed in 48 hour mesocosm trials with clams. Shell lengths, mortality and biomass between the ambient and acidified clams were not significantly different between acidified and ambient treatments. Shell ash weights were lower for acidified clams, evidence of shell dissolution. In the behavioral experiment, ocean acidification reduced the ability of clams to respond to a predator stimulus. Lastly, in predator-prey mesocosm trials, in ambient conditions, crabs ate all or none of the available clams, whereas acidified crabs ate all available clams in many trials and ate at least one acidified clam per trial. The early effects of ocean acidification on M. arenaria will manifest in trophic interactions with other species, rather than impacting M. arenaria alone.

  10. A Predictive Model for the Growth of Listeria monocytogenes in Commercial Blue Crab (Callinectes sapidus).

    Science.gov (United States)

    Parveen, Salina; White, Channel; Tamplin, Mark L

    2017-10-13

    During the processing and handling of commercial blue crab (Callinectes sapidus), Listeria monocytogenes can potentially contaminate cooked meat and grow to hazardous levels. To manage this risk, predictive models are useful tools for designing and implementing preventive controls; however, no model specific for blue crab meat has been published or evaluated. In this study, a cocktail of L. monocytogenes strains was added to pasteurized blue crab meat, which was incubated at storage temperatures from 0 to 35°C. At selected time intervals, L. monocytogenes was enumerated by direct plating onto modified Oxford agar. A primary model was fitted to kinetic data to estimate the lag-phase duration (LPD) and growth rate (GR). Listeria monocytogenes replicated from 0 to 35°C, with GR ranging from 0.004 to 0.518 log CFU/h. Overall, the LPD decreased with increasing temperature, displaying a maximum value of 187 h at 0°C; however, this trend was not consistent. The LPD was not detected at 10°C, and it occurred inconsistently from trial to trial. A secondary GR model (R 2 = 0.9892) for pasteurized crab meat was compared with the L. monocytogenes GR in fresh crab meat, demonstrating bias and accuracy factors of 0.98 and 1.36, respectively. The model estimates varied from other published data and models, especially at temperatures ≥5°C, supporting the need for a specific predictive tool for temperature deviations.

  11. Incidence of bacteremia in stressed and unstressed populations of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Welsh, P C; Sizemore, R K

    1985-01-01

    The incidence of bacteremia in the blue crab, Callinectes sapidus, is reported to be in excess of 80%. Because these results have been controversial, a field study was initiated to determine the effect of commercial capture and handling stresses on the incidence and levels of infection in blue crabs. The majority (75%) of "unstressed" crabs which were captured individually and bled immediately upon removal from the water were bacteremic, with a geometric mean level of infection of 14 CFU/ml of hemolymph. Crabs collected by crab pot, confined within these pots for as long as 24 h, and sampled immediately after removal from the water had a similar mean level of infection. Crabs subjected to the stresses of commercial capture, handling, and transport showed a higher incidence of infection (91%) and a mean infection level of 46 CFU/ml. Injuries sustained by crabs during commercial handling are thought to be associated with the higher incidence of infection. Vibrio spp. were primarily responsible for progressive infections in commercially stressed crabs and were the predominant bacterial type in heavily infected crabs. Our results indicated that uninjured healthy crabs do not have sterile hemolymph but instead harbor low-level bacterial infections. PMID:4051486

  12. Effects of cadmium on survival and bioenergetics of juvenile Callinectes sapidus at different salinities

    Energy Technology Data Exchange (ETDEWEB)

    Guerin, J.L. [Environmental Protection Agency, Gulf Breeze, FL (United States). Gulf Breeze Environmental Research Lab.; Stickle, W.B. [Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Zoology and Physiology

    1995-12-31

    Juvenile blue crabs, Callinectes sapidus, from the Barataria estuary (Louisiana, USA) were exposed to a range of dissolved cadmium concentrations at 2.5 and 25{degree}/ooS to determine their response to cadmium. 21-day LC{sub 50}`s were an order of magnitude lower at 2.5{degree}/oo (19ppb) than at 25{degree}/oo (186ppb). Crabs were exposed to Cd levels of 0, 50 and 100ppb for measurements of physiological rates. Respiration was the primary component (x = 86.2%) of the energy expenditure budget in all cases, relative to excretion. Rates of energy expenditure did not vary with cadmium concentration at either salinity and were much lower than those of energy consumption and absorption. Scope for growth paralleled energy consumption and absorption. Scope for growth did not vary as a function of cadmium concentration at 25{degree}/ooS; at 2.5{degree}/ooS, however, scope for growth was significantly lower in crabs exposed to 50 and 100ppb Cd relative to control crabs. Cadmium levels of up to 100ppb do not stress juvenile blue crabs at 25{degree}/ooS; but at 2.5{degree}/ooS, these same levels of Cd result in mortality and sub-lethal stress. This finding is important since nursery grounds for juveniles of this species often lie in low salinity, estuarine waters, and dissolved cadmium levels as high as 50ppb have been reported in Louisiana estuaries.

  13. Accumulation of toxic organic pollutants in the blue crab Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Hale, R.C.

    1983-01-01

    Levels of toxic organic pollutants (TOP) were examined in the blue crabs, Callinectes sapidus, of Virginia waters. Alkyl substituted polynuclear aromatic hydrocarbons (ASPAH), thought derived from weathered petroleum, were the most common organic pollutants present. Unsubstituted aromatics, heterosubstituted aromatics, polychlorinated biphenyls (PCB), and DDT metabolites were also detected by the analytical procedure employed. Highest levels of ASPAH were found in crabs from the heavily industrialized Hampton Roads area of the James River. Lower concentrations were detected in crabs from the Pocomoke Sound, the upper James and the Rappahannock River sampling sites. PCB levels were elevated in samples taken from both James River stations. Levels of TOP were generally higher in crabs sampled in June than in September of 1981. Concentrations of pollutants in the tissues and tissue lipid content were correlated. Highest levels of both were detected in the hepatopancreas, followed by egg, ovary and muscle. TOP levels in field samples in in-vivo biotransformation of the model compound benzo(a)pyrene (B(a)P) in the hepatopancreas, during in-laboratory experiments, suggested that differences may exist in the uptake and elimination of pollutants as a function of the sex and maturity of the crabs. It appeared that the metabolism of aromatic hydrocarbons varied with the molt stage of the crabs.

  14. Comparison of metal concentrations in tissues of blue crab, Callinectes sapidus from Mediterranean Lagoons.

    Science.gov (United States)

    Mutlu, Cengiz; Türkmen, Mustafa; Türkmen, Aysun; Tepe, Yalçın

    2011-09-01

    This study was performed to investigate the metal concentrations in muscle and gill of blue crab, Callinectes sapidus from Dörtyol Lake, Akyatan Lagoon, Paradeniz Lagoon and Çamlık Lagoon from the northeastern coastal area of Mediterranean Sea. So, the levels of cadmium, chromium, copper, iron, manganese, nickel, aluminum and zinc in tissues of specimens from the lagoons were determined by inductively coupled plasma optical emission spectrometer. The metal concentrations found in muscle tissue varied for Cd: 0.03-0.08, Cr: 0.05-0.13, Cu: 5.38-11.7, Fe: 21.1-38.2, Mn: 0.15-2.98, Ni: 0.24-0.45, Zn: 13.9-20.1 and Al: 1.2-13.7 mg/kg wet weight. Iron showed the highest levels in both tissues, and generally followed by zinc except gills. On the other hand, cadmium showed the lowest levels from all sites. Followed cadmium; chromium had the second lowest levels. The differences between mean metal concentrations from different sampling sites were statistically significant. Regional changes in metal concentration were observed in the tissues of the crabs, but these variations may not influence consumption advisories.

  15. The male blue crab, Callinectes sapidus, uses both chromatic and achromatic cues during mate choice.

    Science.gov (United States)

    Baldwin, Jamie; Johnsen, Sönke

    2012-04-01

    In the blue crab, Callinectes sapidus, claw color varies by sex, sexual maturity and individual. Males rely in part on color cues to select appropriate mates, and these chromatic cues may be perceived through an opponent interaction between two photoreceptors with maximum wavelength sensitivities at 440 and 508 nm. The range of color discrimination of this dichromatic visual system may be limited, however, and it is unclear whether male blue crabs are capable of discriminating the natural variations in claw color that may be important in mate choice. By testing males' innate color preferences in binary choice tests between photographs of red-clawed females and six variations of orange-clawed females, we examined both the chromatic (opponent interaction) and achromatic (relative luminance) cues used in male mate choice. Males significantly preferred red-clawed females to orange-clawed females, except when the test colors were similar in both opponency and relative luminance. Our results are unusual in that they indicate that male mate choice in the blue crab is not guided solely by achromatic or chromatic mechanisms, suggesting that both color and intensity are used to evaluate female claw color.

  16. Photo-induced toxicity of Deepwater Horizon slick oil to blue crab (Callinectes sapidus) larvae.

    Science.gov (United States)

    Alloy, Matthew M; Boube, Idrissa; Griffitt, Robert J; Oris, James T; Roberts, Aaron P

    2015-09-01

    The 2010 Deepwater Horizon oil spill resulted in the accidental release of approximately 700 million L of crude oil into the Gulf of Mexico. Photo-induced toxicity after co-exposure to ultraviolet (UV) radiation is 1 mechanism by which polycyclic aromatic hydrocarbons (PAHs) from oil spills may exert toxicity. Blue crab are an important commercial and ecological resource in the Gulf of Mexico, and their largely transparent larvae may make them sensitive to PAH photo-induced toxicity. The goal of the present study was to examine the sensitivity of early lifestage blue crab (Callinectes sapidus) zoea to slick oil collected during the Deepwater Horizon spill. Blue crab zoea were exposed to 1 of several dilutions of water accommodated fractions from 1 of 2 sources of oil and gradations of natural sunlight in a factorial design. Two 7-h solar exposures were carried out with a recovery period (dark) in between. Survival was found to be UV- and PAH-dependent. Toxicity was observed within the range of surface PAH concentrations reported in the Gulf of Mexico during the Deepwater Horizon spill. These findings indicate that early lifestage blue crab are sensitive to photo-induced toxicity from Deepwater Horizon slick oil. © 2015 SETAC.

  17. Environmental Stress and Pathogen Dynamics in the Blue Crab Callinectes sapidus

    Science.gov (United States)

    Sullivan, T. J.; Neigel, J.; Gelpi, C. G.

    2016-02-01

    The blue crab Callinectes sapidus is an ecologically and economically valuable species along the Gulf of Mexico and Atlantic coasts of North America. Throughout its range, the blue crab encounters a diverse array of parasitic and pathogenic microorganisms that have episodic and occasionally severe impacts on population numbers and viability. This makes understanding factors that influence pathogen dynamics, such as host stress, an important priority. To explore the role of environmental stress on the susceptibility of blue crabs to pathogens we screened individuals collected during the summers of 2014 and 2015 for a number of infectious agents. We sampled three life stages (megalopae, juvenile, and adult) from multiple marsh and offshore locations in Louisiana. Duration of stressful environmental conditions at each location was quantified from hourly recordings provided by the Louisiana Coastwide Reference Monitoring System. Pathogenic microorganisms were detected in crabs from multiple locations and multiple years. Some of the variability in prevalence of infection can be explained by exposure to stressful extremes of temperature and salinity during summer months.

  18. Uptake and survival of enteric viruses in the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Hejkal, T W; Gerba, C P

    1981-01-01

    Uptake of poliovirus 1 by the blue crab, Callinectes sapidus, was measured to assess the likelihood of contamination by human enteric viruses. Virus was found in all parts of the crab within 2 h after the crab was placed in contaminated artificial seawater. The highest concentrations of virus were found in the hemolymph and digestive tract, but the meat also contained virus. The concentration of virus in the crabs was generally less than in the surrounding water. Changes in salinity did not substantially affect the rate of accumulation. An increase in temperature from 15 to 25 degrees C increased the rates of both uptake and removal. Poliovirus survived up to 6 days in crabs at a temperature of 15 degrees C and a salinity of 10 g/kg. When contaminated crabs were boiled, 99.9% of poliovirus 1, simian rotavirus SA11, and a natural isolate of echovirus 1 were inactivated within 8 min. These data demonstrate that viruses in crabs should not pose a serious health hazard if recommended cooking procedures are used. PMID:6261683

  19. Respiratory and digestive responses of postprandial Dungeness crabs, Cancer magister, and blue crabs, Callinectes sapidus, during hyposaline exposure.

    Science.gov (United States)

    Curtis, Daniel L; McGaw, Iain J

    2010-02-01

    Respiratory responses and gastric processing were examined during hyposaline exposure in two crab species of differing osmoregulatory ability. The efficient osmoregulator, Callinectes sapidus, displayed an immediate increase in oxygen uptake when exposed to low salinity in isolation. In contrast, the weak osmoregulator, Cancer magister, showed no change in oxygen uptake upon acute exposure (sapidus were able to sum the demands of osmoregulation and digestion. Thus, gastric processes continued unabated in low salinity. Conversely, postprandial C. magister prioritized responses to low salinity over those of digestion, resulting in a decrease in oxygen uptake when exposed to low salinity. This decrease in oxygen uptake corresponded to a reduction in the rate of contraction of the pyloric stomach and a subsequent doubling of gastric evacuation time. The current study is one of the few to illustrate how summation or prioritization of competing physiological systems is manifested in digestive processes.

  20. Risk of Handling as a Route of Exposure to Infectious Waterborne Cryptosporidium parvum Oocysts via Atlantic Blue Crabs (Callinectes sapidus)▿

    Science.gov (United States)

    Graczyk, Thaddeus K.; McOliver, Cynthia; Silbergeld, Ellen K.; Tamang, Leena; Roberts, Jennifer D.

    2007-01-01

    Commercial Atlantic blue crabs (Callinectes sapidus) were exposed to 2.0 × 104 infectious waterborne oocysts of Cryptosporidium parvum. The study demonstrated that blue crabs can transfer C. parvum oocysts to persons involved in handling or preparing crabs and that they may contaminate other surfaces or products during storage. PMID:17449680

  1. Effects of hexavalent chromium on development of crabs, Rhithropanopeus harrisii and Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Bookhout, C.G.; Monroe, R.J.; Forward, R.B. Jr.; Costlow, J.D. Jr.

    1984-01-01

    Survival of Rhithropanopeus harrisii larvae from hatching to first crab stage occurred in Na/sub 2/CrO/sub 4/ concentrations from 1.1 to 29.1 ppm. Estimated LC50 for complete zoeal development was 17.8 ppm Na/sub 2/CrO/sub 4/ and it was 13.7 ppm for development to first crab stage. A concentration of 1.1 ppm Na/sub 2/CrO/sub 4/ was nontoxic, while Na/sub 2/CrO/sub 4/ concentrations of 7.2 and 14.5 ppm were sublethal and concentrations of 29.1 to 58.1 ppm were acutely toxic. Low concentrations of Na/sub 2/CrO/sub 4/ concentrations of Na/sub 2/CrO/sub 4/ caused an increase in swimming speed and high concentrations caused a decline. Survival of Callinectes sapidus larvae occurred in Na/sub 2/CrO/sub 4/ concentrations from 1.1 to 4.7 ppm. The LC50 for complete zoeal development was estimated to be 2.9 ppm Na/sub 2/CrO/sub 4/ and the LC50 for development to first crab stage was estimated to be 1.0 ppm Na/sub 2/CrO/sub 4/. The total Cr in sodium chromate is 32% by weight, hence, the total Cr concentrations tested were 32% of the Cr salts given above. Statistical analyses of the data on survival, duration and mortality of larvae are presented.

  2. Locomotory fatigue during moderate and severe hypoxia and hypercapnia in the Atlantic blue crab, Callinectes sapidus.

    Science.gov (United States)

    Stover, Kristin K; Burnett, Karen G; McElroy, Eric J; Burnett, Louis E

    2013-04-01

    The Atlantic blue crab, Callinectes sapidus (Rathbun), is a highly mobile crustacean that must locomote to find food, evade predators, find mates, and avoid adverse conditions such as hypoxia. In this study we tested the effects of two levels of hypoxia (10.4 kPa, 50% air saturation = moderate hypoxia; 4 kPa, 20% air saturation = severe hypoxia) and hypercapnic hypoxia (50% air saturation O(2) with Pco(2) = 2 kPa) on fatigue during sustained continuous exercise. Fatigue was induced by an exercise trial that entailed continuous sideways hexapedal walking on an underwater treadmill. Fatigue was quantified using two methods: (1) a pull force test that measures the holding strength of the legs, and (2) the number of fatigue-resisting behaviors (180° turns and stopping). Fatigue was defined as a pull force of 67% or less of the initial pre-exercise pull force and was reached after 6.12 h of walking for crabs in well-aerated normoxic seawater, 4 h in 50% air saturation, 2.07 h in 20% air saturation, and 4.58 h in 50% air saturation and hypercapnia. The number of fatigue-resisting behaviors increased with walking time in all treatments. Performance decreased in hypoxia, with fatigue being reached more quickly as the level of hypoxia intensified. Hypercapnia in moderate hypoxia did not have a deleterious influence on behavior and lengthened slightly the time it took crabs to fatigue. In addition, severe hypoxia exacerbated changes in gait kinematics as crabs became fatigued, by significantly increasing stride length and decreasing stride frequency.

  3. Molecular detection of the parasitic dinoflagellate Hematodinium perezi from blue crabs Callinectes sapidus in Louisiana, USA.

    Science.gov (United States)

    Sullivan, Timothy J; Gelpi, Carey G; Neigel, Joseph E

    2016-06-15

    The dinoflagellate Hematodinium perezi is a prolific pathogen of the blue crab Callinectes sapidus along the Atlantic and Gulf of Mexico coasts of North America. High prevalence, sometimes approaching 100%, and outbreaks with high mortality are associated with higher salinities. H. perezi has not been reported previously in blue crabs from Louisiana, USA, where salinities in coastal habitats are generally below the parasite's favorable range. However, the possibility that H. perezi infects blue crabs in higher salinity habitats offshore has not been investigated. A PCR-based test for H. perezi was used to screen blue crabs collected from both high and low salinity areas. These included juvenile and adult crabs from inshore marshes where salinities are relatively low and from higher salinity offshore shoals that are spawning sites for females. H. perezi was detected in blue crabs from offshore shoals (prevalence=5.6%) but not in juvenile or adult crabs from inshore habitats. Megalopae (post-larvae) were also collected from inshore locations. Although megalopae settle inshore where salinities are relatively low, the megalopal stage is preceded by a planktonic phase in higher salinity offshore waters. We detected H. perezi in 11.2% of settling megalopae tested. Although the prevalence of H. perezi was relatively low within our samples, if spawning females and megalopae are especially vulnerable, the impact on the population could be compounded. This is the first report of H. perezi from blue crabs in Louisiana and demonstrates the importance of examining all life stages in determining the prevalence of a harmful parasite.

  4. Lack of transmission of Hematodinium sp. in the blue crab Callinectes sapidus through cannibalism.

    Science.gov (United States)

    Li, Caiwen; Wheeler, Kersten N; Shields, Jeffrey D

    2011-10-06

    Hematodinium spp. are parasitic dinoflagellates of marine crustaceans. Outbreaks of Hematodinium sp. have impacted commercial landings of the blue crab Callinectes sapidus in the coastal bays of Virginia and Maryland (USA), with seasonal peaks in prevalence reaching 85%. The life cycle and transmission routes of the parasite in blue crabs are poorly understood. Cannibalism and waterborne transmission may be routes of transmission, although little conclusive evidence has been reported for these modes. We examined cannibalism as a route by a series of experiments wherein we repeatedly fed adult and juvenile crabs the tissues of crabs infected with Hematodinium. In each experiment, feeding was done 3 times over the course of 1 wk. Only 2 of 120 crabs were infected within 7 to 9 d after feeding, and these 2 were likely infected prior to the experimental exposures. Crabs inoculated with hemolymph from infected donors served as positive controls. They developed infections over 11 to 21 d, indicating that the Hematodinium sp. used in the cannibalism trials was infectious at the time of inoculation. Because amphipods also harbor Hematodinium-like infections, we fed tissues of infected crabs to the estuarine amphipod Leptocheirus plumulosus. Hematodinium DNA was detected in amphipods shortly after feeding, but not in animals held for longer periods, nor was it observed in histological preparations. Amphipods did not obtain infections by scavenging infected crab tissues. Our results show that Hematodinium sp. is not effectively transmitted through ingestion of diseased tissues, indicating that cannibalism may not be a major route of transmission for Hematodinium sp. in blue crabs.

  5. Functional characterization of neuroendocrine regulation of branchial carbonic anhydrase induction in the euryhaline crab Callinectes sapidus.

    Science.gov (United States)

    Mitchell, Reed T; Henry, Raymond P

    2014-12-01

    Carbonic anhydrase (CA) plays an essential role as a provider of counterions for Na(+)/H(+) and Cl(-)/HCO3 (-) exchange in branchial ionic uptake processes in euryhaline crustaceans. CA activity and gene expression are low in crabs acclimated to full-strength seawater, with transfer to low salinity resulting in large-scale inductions of mRNA and subsequent enzyme activity in the posterior ion-regulating gills (e.g., G7). In the green crab Carcinus maenas, CA has been shown to be under inhibitory neuroendocrine control by a putative hormone in the x-organ-sinus gland complex (XOSG), located in the eyestalk. This study characterizes the neuroendocrine regulation of CA induction in the blue crab Callinectes sapidus, a commonly used experimental organism for crustacean osmoregulation. In crabs acclimated to full-strength seawater, eyestalk ligation (ESL) triggered a 1.8- and 100-fold increase in CA activity and mRNA, respectively. Re-injection with eyestalk homogenates abolished increases in CA activity and fractionally reduced CA gene expression. ESL also enhanced CA induction by 33% after 96 h in crabs transferred to 15 ppt salinity. Injection of eyestalk homogenates into intact crabs transferred from 35 to 15 ppt diminished by 43% the CA induction stimulated by low salinity. These results point to the presence of a repressor hormone in the eyestalk. Separate injections of medullary tissue (MT) and sinus gland (SG), two components of the eyestalk, reduced salinity-stimulated CA activity by 22% and 49%, suggesting that the putative repressor is localized to the SG. Crabs injected with SG extract harvested from crabs acclimated to 5 ppt showed no decrease in CA activity, demonstrating that the hormone is down-regulated at low salinity. Our results show the presence in the XOSG of an inhibitory compound that regulates salinity-stimulated CA induction. © 2014 Marine Biological Laboratory.

  6. [Evaluation of the growth of Callinectes sapidus (Decapoda: Portunidae) by the use of lengthbased methods based on size in Tamaulipas, Mexico].

    Science.gov (United States)

    Rodríguez-Castro, Jorge Homero; Ramírez, José A; Velázquez-de-la-Cruz, Gonzalo; Correa-Sandoval, Alfonso

    2016-06-01

    The capture blue crab (Callinectes sapidus) is one of the major fisheries of the state of Tamaulipas, Mexico; both in volume and selling price, as well as employment generation, but there is little information on its biological characteristics. The aim of this study was to evaluate the growth parameters of the blue crab, establishing the most appropriate method. We estimated the length frequency of 17 814 crabs from commercial catch of thirteen locations, including four coastal lagoons. The lagoons were El Barril, Madre, Morales and San Andrés from Tamaulipas, State. Growth parameters were evaluated using indirect methods ELEFAN, PROJMAT and SLCA in combination with the jackknife technique to establish the uncertainty of estimates inherent in each method. The growth parameters L∞ and k were consolidated for purposes of comparison with the growth index phi prime (Φ’). With a mode of 110 mm, the interval carapace length varied between 60 and 205 mm. The values of the growth parameters varied according to the method used. Using SLCA, L∞ varied between 259 and 260 mm and k ranged between 0.749 and 0.750 /year; with PROJMAT, L∞ recorded values between 205 and 260 mm, k fluctuated between 0.550 and 0.740/year, and with ELEFAN, L∞ ranged between 156 and 215 mm and k varied between 0.479 and 0.848/year. Estimates by jackknife detected no variability in Φ’ between locations and significant differences between methods. The ranges of values of Φ’ and PROJMAT estimated SLCA (4.70 to 4.71 and 4.66 to 4.70, respectively) were in the range reported in the literature (4.201-4.798), while lower values ELEFAN contributed significantly (3.87 to 4.27). The SLCA and PROJMAT methods in combination with the jackknife technique, proved to be the most suitable to estimate the growth parameters of C. sapidus.

  7. Efficacy of alfaxalone for intravascular anesthesia and euthanasia in blue crabs (Callinectes sapidus).

    Science.gov (United States)

    Minter, Larry J; Harms, Craig A; Archibald, Kate E; Broadhurst, Heather; Bailey, Kate M; Christiansen, Emily F; Lewbart, Gregory A; Posner, Lysa P

    2013-09-01

    The objective of this study was to characterize the behavioral effects and changes in heart rate of four doses of alfaxalone delivered by intravascular injection to blue crabs (Callinectes sapidus). Thirty (male, n = 27; female, n = 3) blue crabs were randomly assigned to one of four treatment groups of alfaxalone: eight animals were assigned to each of the 5-, 10-, and 15-mg/kg treatment groups, and the remaining six animals were assigned to the 100-mg/kg group. Times for anesthetic induction and recovery periods were recorded. Righting reflex, defensive posturing, and heart rate were evaluated before, during, and after the anesthetic trial. Anesthesia was induced in all 14 animals consolidated into the high-dosage group (15 mg/kg [n = 8] and 100 mg/kg [n = 6]), which was significantly greater than 8 of 16 animals in the low-dosage group (5 mg/kg [n = 2] and 10 mg/kg [n = 6]). Median anesthesia induction time for all crabs was 0.4 min, with no significant difference in induction time between groups observed. Median recovery time was 9.4 min (n = 2), 6.1 min (n = 5), 11.3 min (n = 8), and 66.1 min (n = 5) for the 5-, 10-, 15-, and 100-mg/kg groups, respectively. Recovery times were significantly longer for crabs exposed to an induction dose of 100 mg/kg compared with the 10- and 15-mg/kg induction doses. A significant decrease in the median heart rate was observed between the baseline value and that observed at both induction and 5 min postinjection in the 100-mg/kg dose trial. Two mortalities were observed during the anesthesia trials (n = 1, 10 mg/kg; n = 1, 100 mg/kg), both associated with the autotomization of limbs. In summary, the intravascular administration of alfaxalone at 15 mg/kg provided rapid and reliable sedation, whereas alfaxalone administered at 100 mg/kg produced rapid and long lasting anesthesia.

  8. CALCIUM PHOSPHATE GRANULES IN THE HEPATOPANCREAS OF THE BLUE CRAB CALLINECTES SAPIDUS

    Science.gov (United States)

    Becker, Gerald L.; Chen, Chung-Ho; Greenawalt, John W.; Lehninger, Albert L.

    1974-01-01

    The hepatopancreas of the adult male blue crab Callinectes sapidus in intermolt was found to contain substantial amounts of calcium, magnesium, and inorganic phosphorus, averaging about 260, 20, and 250 µg-atoms per g wet tissue, respectively, accounting for over 10% of the tissue dry weight. Electron microscopy of the intact tissue showed three qualitatively different granular structures having electron densities suggestive of high mineral content. After fractionation of the tissue using centrifugal techniques, almost 95% of the total mineral was found to reside in a heavy, nonmitochondrial particulate fraction(s). The bulk of the low-speed pellet consisted of relatively dense, roughly spherical granules 1–5 µm in diameter, which could be considerably purified by repeated suspension in water and low-speed sedimentation. In the electron microscope the isolated granules appeared basically similar to one of the three characteristic types of electron-dense granules seen in the intact tissue. Although the freshly isolated granules lost approximately 50% of their wet weight when dried at 105°C, only 10% more was lost upon dry ashing at 450°C, suggesting a fairly low content of organic material. Chemical analysis revealed calcium, magnesium, and inorganic phosphate at 5.7, 2.1, and 4.4 µg-atoms per mg dried granules, respectively, accounting for 69% of the dry weight of the fraction. By specific enzymatic assays, the freshly isolated granules were found to contain ATP, ADP, and AMP at levels of 0.13, 0.03, and 0.01 µmol/mg, or 8% of their total dry weight. The remainder of the total phosphorus contributed an additional 3%, whereas carbonate, citrate, oxalate, and protein each constituted no more than 1%. The mineral granules of the crab hepatopancreas appear to function as storage forms of calcium and phosphate during the intermolt period. This tissue appears promising as a model for study of the cellular events associated with biological calcification, since

  9. Cloning of aquaporin-1 of the blue crab, Callinectes sapidus: its expression during the larval development in hyposalinity.

    Science.gov (United States)

    Chung, J Sook; Maurer, Leah; Bratcher, Meagan; Pitula, Joseph S; Ogburn, Matthew B

    2012-09-03

    Ontogenetic variation in salinity adaptation has been noted for the blue crab, Callinectes sapidus, which uses the export strategy for larval development: females migrate from the estuaries to the coast to spawn, larvae develop in the ocean, and postlarvae (megalopae) colonize estuarine areas. We hypothesized that C. sapidus larvae may be stenohaline and have limited osmoregulatory capacity which compromises their ability to survive in lower salinity waters. We tested this hypothesis using hatchery-raised larvae that were traceable to specific life stages. In addition, we aimed to understand the possible involvement of AQP-1 in salinity adaptation during larval development and during exposure to hyposalinity. A full-length cDNA sequence of aquaporin (GenBank JQ970426) was isolated from the hypodermis of the blue crab, C. sapidus, using PCR with degenerate primers and 5' and 3' RACE. The open reading frame of CasAQP-1 consists of 238 amino acids containing six helical structures and two NPA motifs for the water pore. The expression pattern of CasAQP-1 was ubiquitous in cDNAs from all tissues examined, although higher in the hepatopancreas, thoracic ganglia, abdominal muscle, and hypodermis and lower in the antennal gland, heart, hemocytes, ovary, eyestalk, brain, hindgut, Y-organs, and gill. Callinectes larvae differed in their capacity to molt in hyposalinity, as those at earlier stages from Zoea (Z) 1 to Z4 had lower molting rates than those from Z5 onwards, as compared to controls kept in 30 ppt water. No difference was found in the survival of larvae held at 15 and 30 ppt. CasAQP-1 expression differed with ontogeny during larval development, with significantly higher expression at Z1-2, compared to other larval stages. The exposure to 15 ppt affected larval-stage dependent CasAQP-1 expression which was significantly higher in Z2- 6 stages than the other larval stages. We report the ontogenetic variation in CasAQP-1 expression during the larval development

  10. Crustáceos no cerrito Ariano Souza, Rio Grande, Rio Grande do Sul e distribuição de Callinectes sapidus (Brachyura, Portunidae Crustaceans in the archaeological site Ariano Souza, Rio Grande, Rio Grande do Sul and distribution of Callinectes sapidus (Brachyura, Portunidae

    Directory of Open Access Journals (Sweden)

    Cléverson Ranniéri M. dos Santos

    2004-03-01

    Full Text Available While all species of the genus Callinectes Stimpson, 1860 have a continuous distribution on the Atlantic coast of the Americas, Callinectes sapidus Rathbun, 1896 is the only one with disjunct distribution. Considering that this species was introduced in Europe and Japan, it has been suggested that the occurrence of C. sapidus on the southern coast of Brazil was due to the transport by ballast water. In the archaeological site Ariano Souza, located in the estuary of the Patos Lagoon (southern Brazil, remains of crustaceans, including claws of approximately two thousand years ago, were found. A preliminary analysis of this material showed Callinectes chelae. Because this archaeological site is located inside the estuary, it has been hypothesized that these chelae belong either to C. sapidus or to C. danae Smith, 1869. A comparison between pincers collected in the archaeological and pincers of these two species (90 dactyls, 30 of each type was performed. The analysis (ANOVA considered the variability of seven characters of the dactyls, and demonstrated the existence of two groups. Results showed that the measured characters suffice to separate these species, and indicated that the material found in the archaeological site belongs to C. sapidus. The hypothesis of the introduction of C. sapidus in the area is rejected. The possible biogeographic history of the species is discussed.

  11. Toxicity of ozonated estuarine water to juvenile blue crabs (Callinectes sapidus) and Juvenile Atlantic menhaden (Brevoortia tyrannus)

    Energy Technology Data Exchange (ETDEWEB)

    Richardson, L.B.; Burton, D.T.

    1981-02-01

    Large quantitites of estuarine and marine water are treated with chlorine to prevent condenser system fouling at power plants. Chlorine and its residual by-products, however, are toxic to many forms of aquatic life. Ozone is one alternative oxidant which has proven to be an effective biocide and disinfectant in many fresh water applications. Ozonation of estuarine and marine waters, however, may produce residual compounds similar to those produced by chlorination. This study was initiated to provide baseline information on the toxicity of ozonated estuarine water to two representative estuarine species. The blue crab, Callinectes sapidus Rathbun, and the Atlantic menhaden, Brevoortia tyrannus Latrobe, were selected because of their wide distribution and commercial importance. The toxicity of ozone has been compared with chlorine toxicity data from the literature in an effort to examine possible similarities in toxicity.

  12. Comparative analysis of the proximate and elemental composition of the blue crab Callinectes sapidus, the warty crab Eriphia verrucosa, and the edible crab Cancer pagurus

    OpenAIRE

    Zotti, Maurizio; Coco, Laura Del; Pascali, Sandra Angelica De; Migoni, Danilo; Vizzini, Salvatrice; Mancinelli, Giorgio; Fanizzi, Francesco Paolo

    2016-01-01

    The proximate composition and element contents of claw muscle tissue of Atlantic blue crabs (Callinectes sapidus) were compared with the native warty crab (Eriphia verrucosa) and the commercially edible crab (Cancer pagurus). The scope of the analysis was to profile the chemical characteristics and nutritive value of the three crab species. Elemental fingerprints showed significant inter-specific differences, whereas non-significant variations in the moisture and ash contents were observed. I...

  13. Hemolymph ecdysteroids during the last three molt cycles of the blue crab, Callinectes sapidus: quantitative and qualitative analyses and regulation.

    Science.gov (United States)

    Chung, J Sook

    2010-01-01

    The profiles of circulating ecdysteroids during the three molt cycles prior to adulthood were monitored from the juvenile blue crab, Callinectes sapidus. Ecdysteroid patterns are remarkably similar in terms of peak concentrations ranging between 210-330 ng/ml hemolymph. Analysis of hemolymph at late premolt stage revealed six different types of ecdysteroids with ponasterone A (PoA) and 20-OH ecdysone (20-OH E) as the major forms. This ecdysteroid profile was consistent in all three molt cycles. Bilateral eyestalk ablation (EA) is a procedure that removes inhibitory neurohormones including crustacean hyperglycemic hormone (CHH) and molt-inhibiting hormone (MIH) and often results in precocious molting in crustaceans. However, the inhibitory roles of these neuropeptides in vivo have not yet been tested in C. sapidus. We determined the regulatory roles of CHH and MIH in the circulating ecdysteroid from ablated animals through daily injection. A daily administration of purified native CHH and MIH at physiological concentration maintained intermolt levels of ecdysteroids in the EA animals. This suggests that Y organs (YO) require a brief exposure to CHH and MIH in order to maintain the low level of ecdysteroids. Compared to intact animals, the EA crabs did not exhibit the level of peak ecdysteroids, and the major ecdysteroid turned out to be 20-OH E, not PoA. These results further underscore the important actions of MIH and CHH in ecdysteroidogenesis, as they not only inhibit, but also control the composition of output of the YO activity. (c) 2009 Wiley Periodicals, Inc.

  14. Extracellular digestion during hyposaline exposure in the Dungeness crab, Cancer magister, and the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Curtis, Daniel L; van Breukelen, Frank; McGaw, Iain J

    2013-12-01

    Extracellular digestive processes were examined in the Dungeness crab, Cancer magister and the blue crab, Callinectes sapidus, during hyposaline exposure. Both species are found in estuaries as adults, but vary in their ability to balance the cardiovascular and respiratory demands of concurrent osmoregulation and digestion. The weak osmoregulator, C. magister, is unable to balance the demands of osmoregulation and digestion. Concordant with observed decreases in oxygen consumption and mechanical digestion, proteolytic digestion within the foregut and hepatopancreas was delayed, resulting in a relative reduction of circulating amino acids post-feeding in low salinity. In contrast, the efficient osmoregulator, C. sapidus, balances the demands of osmoregulation and digestion, and mechanical digestion continues unabated in low salinity. Protease activity in the gut fluid and hepatopancreas showed either no change or a reduction over time. The transport of amino acids into the cells post-feeding is opposed by an efflux of amino acids at the cellular level, and resulted in a build up of amino acids in the hemolymph. Despite differences in the extracellular responses to low salinity exposure following feeding, both species were able to maintain high digestive efficiencies. © 2013.

  15. Temperature correlates with annual changes in Hematodinium perezi prevalence in blue crab Callinectes sapidus in Florida, USA.

    Science.gov (United States)

    Gandy, Ryan; Schott, Eric J; Crowley, Claire; Leone, Erin H

    2015-04-08

    Blue crabs Callinectes sapidus were monitored biannually throughout Florida, USA, for 2 yr using a highly sensitive, quantitative polymerase chain reaction (qPCR) to determine the spatial and temporal changes in prevalence and intensity of Hematodinium perezi infections during drought years. Despite persistent drought conditions, H. perezi infections were not universally found. Overall prevalence was 25.3% (95% CI: 22.8-28.1%) in 1066 crabs sampled from 6 locations (Jacksonville, Ormond Beach, Everglades City, Tampa Bay, Steinhatchee, and Panama City) from 2011 to 2012. Presence of H. perezi was consistently highest in winter season samples, ranging from 4.2-51.1% (3 locations) in 2011, to 32-83% (5 locations) in 2012. The highest prevalence and intensities were observed in the winter samples from Everglades City. Previous studies have found that the prevalence of H. perezi in C. sapidus in temperate regions of the US East Coast shows seasonal peaks in early winter in Maryland and South Carolina and in fall and spring in Georgia. The seasonality of infections in the subtropical waters of Florida reinforces the concept that temperature is a strong factor that may override other drivers, such as drought. Seasonal H. perezi infections in Florida appear to be triggered by the parasite responding to an optimal temperature during the annual rise from the low temperature of winter when salinity is elevated. However, salinity alone is not sufficient to trigger an increase in prevalence of H. perezi in Florida.

  16. An insulin-like growth factor found in hepatopancreas implicates carbohydrate metabolism of the blue crab Callinectes sapidus.

    Science.gov (United States)

    Chung, J Sook

    2014-04-01

    Hyperglycemia that is caused by the release of crustacean hyperglycemic hormone (CHH) from the sinus gland to hemolymph is one of the hallmark physiological phenomena, occurring in decapod crustaceans experiencing stressful conditions. However, the mechanism(s) by which such elevated glucose levels return to resting levels is still unknown. Interestingly, noted is a difference in the clearance rate of hemolymph glucose between adult females and adult males of the blue crab, Callinectes sapidus: the former with more rapid clearance than the latter. The presence of an endogenous-insulin-like molecule is suggested in C. sapidus because an injection of bovine insulin, significantly reduces the levels of hemolymph glucose that were previously elevated by emersion stress or the glucose injection. Using 5' and 3' RACE, the full-length cDNA of an insulin-like molecule is isolated from the hepatopancreas of an adult female C. sapidus and shows the same putative sequence of an insulin-like androgenic gland factor (IAG) but differs in 5' and 3' UTR sequences. A knock-down study using five injections of double-stranded RNA of CasIAG-hep (dsRNA-CasIAG-hep, 10μg/injection) over a 10-day period reduces CasIAG-hep expression by ∼50%. The levels of hemolymph glucose are also kept higher in dsRNA-CasIAG-hep injected group than those treated with dsRNA-green fluorescent protein (dsRNA-IAG-hep) or saline. Most importantly, the hepatopancreas of dsRNA-CasIAG-hep injected animals contains amounts of carbohydrate (glucose, trehalose, and glycogen) significantly lower than those of control groups, indicating that the function of CasIAG-hep in carbohydrate metabolism in crustaceans is similar to carbohydrate metabolism in vertebrates. Copyright © 2014 Elsevier Inc. All rights reserved.

  17. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae) in the Southeast coast of Brazil.

    Science.gov (United States)

    Severino-Rodrigues, Evandro; Musiello-Fernandes, Joelson; Moura, Alvaro A S; Branco, Geisa M P; Canéo, Victor O C

    2013-06-01

    C sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt), and cephalothorax width (CW) was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We) and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne). A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50) occurred at CW = 10.33 cm, and the size in which all were mature (L100) was CW = 11.20 cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11 cm of carapace width.

  18. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae in the Southeast coast of Brazil

    Directory of Open Access Journals (Sweden)

    Evandro Severino-Rodrigues

    2013-06-01

    Full Text Available C. sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt, and cephalothorax width (CW was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne. A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50 occurred at CW=10.33cm, and the size in which all were mature (L100 was CW=11.20cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11cm of carapace width.

  19. Detecting selection in the blue crab, Callinectes sapidus, using DNA sequence data from multiple nuclear protein-coding genes.

    Science.gov (United States)

    Yednock, Bree K; Neigel, Joseph E

    2014-01-01

    The identification of genes involved in the adaptive evolution of non-model organisms with uncharacterized genomes constitutes a major challenge. This study employed a rigorous and targeted candidate gene approach to test for positive selection on protein-coding genes of the blue crab, Callinectes sapidus. Four genes with putative roles in physiological adaptation to environmental stress were chosen as candidates. A fifth gene not expected to play a role in environmental adaptation was used as a control. Large samples (n>800) of DNA sequences from C. sapidus were used in tests of selective neutrality based on sequence polymorphisms. In combination with these, sequences from the congener C. similis were used in neutrality tests based on interspecific divergence. In multiple tests, significant departures from neutral expectations and indicative of positive selection were found for the candidate gene trehalose 6-phosphate synthase (tps). These departures could not be explained by any of the historical population expansion or bottleneck scenarios that were evaluated in coalescent simulations. Evidence was also found for balancing selection at ATP-synthase subunit 9 (atps) using a maximum likelihood version of the Hudson, Kreitmen, and Aguadé test, and positive selection favoring amino acid replacements within ATP/ADP translocase (ant) was detected using the McDonald-Kreitman test. In contrast, test statistics for the control gene, ribosomal protein L12 (rpl), which presumably has experienced the same demographic effects as the candidate loci, were not significantly different from neutral expectations and could readily be explained by demographic effects. Together, these findings demonstrate the utility of the candidate gene approach for investigating adaptation at the molecular level in a marine invertebrate for which extensive genomic resources are not available.

  20. Epidermal carbonic anhydrase activity and exoskeletal metal content during the molting cycle of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Calhoun, Stacy; Zou, Enmin

    2016-03-01

    During the crustacean molting cycle, the exoskeleton is first mineralized in postmolt and intermolt and then presumably demineralized in premolt in order for epidermal retraction to occur. The mineralization process calls for divalent metal ions, such as Ca(2+) and Mg(2+) , and bicarbonate ions whereas protons are necessary for dissolution of carbonate salts. Carbonic anhydrase (CA) has been suggested to be involved in exoskeletal mineralization by providing bicarbonate ions through catalyzing the reaction of carbon dioxide hydration. However, results of earlier studies on the role of epidermal CA in metal incorporation in crustacean exoskeleton are not consistent. This study was aimed to provide further evidence to support the notion that epidermal CA is involved in exoskeletal mineralization using the blue crab, Callinectes sapidus (Rathbun 1896), as the model crustacean. Significant increases first in calcium and magnesium then in manganese post-ecdysis indicate significant metal deposition during postmolt and intermolt. Significant positive correlation between calcium or magnesium content and epidermal CA activity in postmolt and intermolt constitutes evidence that CA is involved in the mineralization of the crustacean exoskeleton. Additionally, we proposed a hypothetical model to describe the role of epidermal CA in both mineralization and demineralization of the exoskeleton based on the results of epidermal CA activity and exoskeletal metal content during the molting cycle. Furthermore, we found that the pattern of epidermal CA activity during the molting cycle of C. sapidus is similar to that of ecdysteroids reported for the same species, suggesting that epidermal CA activity may be under control of the molting hormones. © 2016 Wiley Periodicals, Inc.

  1. The Involvement of Hemocyte Prophenoloxidase in the Shell-Hardening Process of the Blue Crab, Callinectes sapidus.

    Directory of Open Access Journals (Sweden)

    Javier V Alvarez

    Full Text Available Cuticular structures of arthropods undergo dramatic molt-related changes from being soft to becoming hard. The shell-hardening process of decapod crustaceans includes sclerotization and mineralization. Hemocyte PPO plays a central role in melanization and sclerotization particularly in wound healing in crustaceans. However, little is known about its role in the crustacean initial shell-hardening process. The earlier findings of the aggregation of heavily granulated hemocytes beneath the hypodermis during ecdysis imply that the hemocytes may be involved in the shell-hardening process. In order to determine if hemocytes and hemocyte PPO have a role in the shell-hardening of crustaceans, a knockdown study using specific CasPPO-hemo-dsRNA was carried out with juvenile blue crabs, Callinectes sapidus. Multiple injections of CasPPO-hemo-dsRNA reduce specifically the levels of CasPPO-hemo expression by 57% and PO activity by 54% in hemocyte lysate at the postmolt, while they have no effect on the total hemocyte numbers. Immunocytochemistry and flow cytometry analysis using a specific antiserum generated against CasPPO show granulocytes, semigranulocytes and hyaline cells as the cellular sources for PPO at the postmolt. Interestingly, the type of hemocytes, as the cellular sources of PPO, varies by molt stage. The granulocytes always contain PPO throughout the molt cycle. However, semigranulocytes and hyaline cells become CasPPO immune-positive only at early premolt and postmolt, indicating that PPO expression in these cells may be involved in the shell-hardening process of C. sapidus.

  2. The Involvement of Hemocyte Prophenoloxidase in the Shell-Hardening Process of the Blue Crab, Callinectes sapidus.

    Science.gov (United States)

    Alvarez, Javier V; Chung, J Sook

    2015-01-01

    Cuticular structures of arthropods undergo dramatic molt-related changes from being soft to becoming hard. The shell-hardening process of decapod crustaceans includes sclerotization and mineralization. Hemocyte PPO plays a central role in melanization and sclerotization particularly in wound healing in crustaceans. However, little is known about its role in the crustacean initial shell-hardening process. The earlier findings of the aggregation of heavily granulated hemocytes beneath the hypodermis during ecdysis imply that the hemocytes may be involved in the shell-hardening process. In order to determine if hemocytes and hemocyte PPO have a role in the shell-hardening of crustaceans, a knockdown study using specific CasPPO-hemo-dsRNA was carried out with juvenile blue crabs, Callinectes sapidus. Multiple injections of CasPPO-hemo-dsRNA reduce specifically the levels of CasPPO-hemo expression by 57% and PO activity by 54% in hemocyte lysate at the postmolt, while they have no effect on the total hemocyte numbers. Immunocytochemistry and flow cytometry analysis using a specific antiserum generated against CasPPO show granulocytes, semigranulocytes and hyaline cells as the cellular sources for PPO at the postmolt. Interestingly, the type of hemocytes, as the cellular sources of PPO, varies by molt stage. The granulocytes always contain PPO throughout the molt cycle. However, semigranulocytes and hyaline cells become CasPPO immune-positive only at early premolt and postmolt, indicating that PPO expression in these cells may be involved in the shell-hardening process of C. sapidus.

  3. Detecting selection in the blue crab, Callinectes sapidus, using DNA sequence data from multiple nuclear protein-coding genes.

    Directory of Open Access Journals (Sweden)

    Bree K Yednock

    Full Text Available The identification of genes involved in the adaptive evolution of non-model organisms with uncharacterized genomes constitutes a major challenge. This study employed a rigorous and targeted candidate gene approach to test for positive selection on protein-coding genes of the blue crab, Callinectes sapidus. Four genes with putative roles in physiological adaptation to environmental stress were chosen as candidates. A fifth gene not expected to play a role in environmental adaptation was used as a control. Large samples (n>800 of DNA sequences from C. sapidus were used in tests of selective neutrality based on sequence polymorphisms. In combination with these, sequences from the congener C. similis were used in neutrality tests based on interspecific divergence. In multiple tests, significant departures from neutral expectations and indicative of positive selection were found for the candidate gene trehalose 6-phosphate synthase (tps. These departures could not be explained by any of the historical population expansion or bottleneck scenarios that were evaluated in coalescent simulations. Evidence was also found for balancing selection at ATP-synthase subunit 9 (atps using a maximum likelihood version of the Hudson, Kreitmen, and Aguadé test, and positive selection favoring amino acid replacements within ATP/ADP translocase (ant was detected using the McDonald-Kreitman test. In contrast, test statistics for the control gene, ribosomal protein L12 (rpl, which presumably has experienced the same demographic effects as the candidate loci, were not significantly different from neutral expectations and could readily be explained by demographic effects. Together, these findings demonstrate the utility of the candidate gene approach for investigating adaptation at the molecular level in a marine invertebrate for which extensive genomic resources are not available.

  4. Effects of acidifying ocean conditions on growth and survival of two life stages of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Giltz, S.; Taylor, C.

    2016-02-01

    Blue crabs, Callinectes sapidus, begin their larval phase offshore and circulate for approximately 30 days before settling near shore. As crabs transition to the juvenile stage, they move into coastal or estuarine environments characterized by lower salinity. Presently the average pH of the ocean is 8.1, 30% down from the beginning of the industrial revolution and is forecasted to drop to 7.8 by 2100. Decreasing pH causes dissolution of calcium carbonate shells, but the overall effects on crustaceans, such as blue crabs, are unknown. This study investigated the effect of a lower pH environment on the growth, survival, carapace hardness and molt frequency of larval and juvenile blue crabs in the Northern Gulf of Mexico. Larval crabs showed delayed growth under low pH (7.8) conditions compared to crabs in a control (present day) pH (8.1) environment. Population crashes (complete mortality) were experienced in 55% of the low pH aquaria but not in any of the control aquaria, suggesting that acidification poses a mortality risk. Under low pH conditions the intermolt duration decreased in juveniles, but the body length and weight did not differ from crabs raised in the control pH. Larvae (in tanks that did not crash) and juveniles did not experience increased mortality from a lower pH, but there do appear to be sublethal effects on growth and molting that differ between life history stages.

  5. Species profiles: Life histories and environmental requirements of coastal fishes and invertebrates (Gulf of Mexico): Blue crab. [Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Perry, H.M.; McIlwain, T.D.

    1986-06-01

    The blue crab, Callinectes sapidus, is common in tidal marsh estuaries and coastal waters of the Gulf of Mexico, occupying a variety of habitats depending upon the physiological requirements of each particular stage in its life history. Spawning occurs from spring through fall in high salinity estuarine and/or coastal waters. Development through the 7 zoeal stages requires approximately 31 days and occurs offshore. The megalopal stage is usually completed within a week. Recruitment to the estuary occurs during the megalopal stage. Molt to the first crab takes place within the estuary. Juveniles exhibit wide seasonal and areal distribution. Growth is rapid and blue crabs in the Gulf of Mexico may reach maturity within a year. Factors affecting growth and survival include food availability, predation, substratum, available habitat, temperature, salinity and pollutants. Blue crabs do not conform to specific trophic levels and are characterized as opportunistic benthic omnivores. Their diverse feeding habits and their importance as prey species for a variety of organisms make them an integral part of coastal ecosystems.

  6. Acute toxicity, histopathology, and bioconcentration-retention studies with No. 2 fuel oil and the blue crab, Callinectes sapidus Rathbun

    Energy Technology Data Exchange (ETDEWEB)

    Melzian, B.D.

    1982-01-01

    Adult male blue crabs (Callinectes sapidus Rathbun) were exposed in a flow-through system to five concentrations, nominally 0.0 (control), 1.0, 5.0, 10.0, or 20.0 ppm of the water accommodated fraction (WAF) of No. 2 fuel oil. The 96-hour LC/sub 5//sup 0/ was 14.1 ppm. All crabs in the 5.0, 10.0, and 20.0 ppm tanks exhibited abnormal behavior prior to death including periodic beating of the maxillipedal flagella, hyperactivity, ataxia, and equilibrium loss. The ability of adult male and female blue crabs to bioconcentrate and retain No. 2 fuel oil compounds was examined after crabs were exposed for two weeks or 30-35 days in flow-through systems to three sublethal No. 2 fuel oil WAF concentrations, nominally 0.00 (control), 0.01, or 1.0 ppm. Gill, hepatopancreas, and muscle tissues were analyzed by gas chromatography/mass spectrometry. Trace amounts of fuel oil hydrocarbons were detected in gill and hepatopancreas at 0.01 ppm exposures. All tissues bioconcentrated fuel oil compounds during 1.0 ppm WAF exposure periods, and with the exception of the gills, little depuration or metabolism of the bioconcentrated compounds occurred during a period of 30 days in clean, running seawater.

  7. Accumulation and retention of No. 2 fuel-oil compounds in the blue crab, Callinectes sapidus' rathbun

    Energy Technology Data Exchange (ETDEWEB)

    Melzian, B.D.; Lake, J.

    1987-01-01

    In order to determine if Blue Crabs (Callinectes sapidus) can bioaccumulate and retain complex mixtures of petroleum hydrocarbons, adult crabs were exposed for 14 days or 30-35 days in continuous flow-through seawater systems to three sublethal concentrations, nominally 0.00 (control), 0.01, or 1.0 ppm (mg/liter), of the water-accomodated fraction (WAF) of Number (No.) 2 fuel oil. Crabs exposed for 14 days were subsequently exposed to clean running seawater for a 30 day depuration period. Gill, hepatopancreas, and muscle tissue samples were collected from control, WAF exposed, and depurated crabs and analyzed by gas chromatography and/or gas chomatography-mass spectrometry. No. 2 fuel-oil compounds were not detected in any of the tissues of the control crabs. Trace amounts of fuel-oil compounds were detected in gill and hepatopancreas tissues collected from crabs exposed to the 0.01 ppm WAF and no fuel-oil compounds were detected in muscle tissues. All tissues of crabs exposed to the 1.0 ppm WAF accumulated No. 2 fuel-oil compounds and considerable amounts remained in hepatopancreas and gill tissues following depuration for 30 days in clean seawater.

  8. A Multifaceted Mass Spectrometric Method to Probe Feeding Related Neuropeptide Changes in Callinectes sapidus and Carcinus maenas.

    Science.gov (United States)

    Zhang, Yuzhuo; DeLaney, Kellen; Hui, Limei; Wang, Junhua; Sturm, Robert M; Li, Lingjun

    2018-02-12

    Food intake is regulated by various neuromodulators, including numerous neuropeptides. However, it remains elusive at the molecular and cellular level as to how these important chemicals regulate internal processes and which regions of the neuronal organs are responsible for regulating the behavior. Here we report a comparative neuropeptidomic analysis of the brain and pericardial organ (PO) in response to feeding in two well-studied crustacean physiology model organisms, Callinectes sapidus and Carcinus maenas, using mass spectrometry (MS) techniques. A multifaceted MS-based approach has been developed to obtain complementary information on the expression changes of a large array of neuropeptides in the brain and PO. The method employs stable isotope labeling of brain and PO extracts for relative MS quantitation, capillary electrophoresis (CE)-MS for fractionation and high-specificity analysis, and mass spectrometric imaging (MSI) for in-situ molecular mapping of peptides. A number of neuropeptides, including RFamides, B-type allatostatins (AST-B), RYamides, and orcokinins exhibit significant changes in abundance after feeding in this investigation. Peptides from the AST-B family found in PO tissue were shown to have both altered expression and localization changes after feeding, indicating that they may be a class of vital neuropeptide regulators involved in feeding behavior. Graphical Abstract ᅟ.

  9. Mercury, lead, and cadmium in blue crabs, Callinectes sapidus, from the Atlantic coast of Florida, USA: a multipredator approach.

    Science.gov (United States)

    Adams, Douglas H; Engel, Marc E

    2014-04-01

    Blue crabs, Callinectes sapidus, from the Atlantic coast of Florida were analyzed for total mercury, methylmercury, lead, and cadmium. Paired samples of two tissue types were analyzed for each crab, (1) muscle tissue (cheliped and body muscles) and (2) whole-body tissue (all organs, muscle tissue and connective tissue), for evaluation of the concentration of metals available to human consumers as well as estuarine predators. There were clear patterns of tissue-specific partitioning for each metal. Total mercury was significantly greater in muscle tissue (mean=0.078 µg/g) than in whole-body tissue (mean=0.055 µg/g). Conversely, whole-body concentrations of lead and cadmium (means=0.131 and 0.079 µg/g, respectively) were significantly greater than concentrations in muscle (means=0.02 and 0.029 µg/g, respectively). There were no significant correlations between any metal contaminant and crab size. Cadmium levels were significantly greater in the muscle tissue of females, but, no other sex-related differences were seen for other metals or tissue types. Methylmercury composed 93-100% of the total mercury in tissues. Compared to previous blue crab studies from different regions of the United States, mean concentrations of mercury, lead, and cadmium were relatively low, although isolated groups or individual blue crabs accumulated high metal concentrations. © 2013 Published by Elsevier Inc.

  10. Detailed spectroscopic study of the role of Br and Sr in coloured parts of the Callinectes sapidus crab claw.

    Science.gov (United States)

    Katsikini, M

    2016-07-01

    The exoskeleton of crustaceans consists mainly of calcium carbonate (CaCO3) minerals and in many cases exhibits vivid colouration due to the presence of proteins rich in carotenoid chromophores. The exposure of aquatic animals in sea water results often in the incorporation of trace elements in their exoskeleton. The bonding configuration of Br and Sr trace elements in regions with different staining (white, orange and blue) of the exoskeleton of the Callinectes sapidus in crab claw are systematically investigated by a number of complementary spectroscopic techniques, including X-ray absorption fine structure spectroscopy (EXAFS), X-ray fluorescence, Raman and visible light reflectivity spectroscopies. It is found that Sr substitutes for Ca and the Sr/Ca ratio is constant along the claw. In the orange region that includes the claw fingers, CaCO3 adopts a calcite-like structure, whereas in the blue and white regions, located in the palm of the claw, an aragonite-like structure dominates. On the other hand, Br, present only in the blue and orange stained parts of the claw, is bound to phenyl and/or phenol rings of amino acid residues, most probably to phenylalanine and/or tyrosine, of the chromophore protein. Copyright © 2016 Elsevier Inc. All rights reserved.

  11. Application of Artificial Neural Networks (ANNs for Weight Predictions of Blue Crabs (Callinectes sapidus RATHBUN, 1896 Using Predictor Variables

    Directory of Open Access Journals (Sweden)

    C. TURELI BILEN

    2011-10-01

    Full Text Available An evaluation of the performance of artificial networks (ANNs to estimate the weights of blue crab (Callinectes sapidus catches in Yumurtalık Cove (Iskenderun Bay that uses measured predictor variables is presented, including carapace width (CW, sex (male, female and female with eggs, and sampling month. Blue crabs (n=410 were collected each month between 15 September 1996 and 15 May 1998. Sex, CW, and sampling month were used and specified in the input layer of the network. The weights of the blue crabs were utilized in the output layer of the network. A multi-layer perception architecture model was used and was calibrated with the Levenberg Marguardt (LM algorithm. Finally, the values were determined by the ANN model using the actual data. The mean square error (MSE was measured as 3.3, and the best results had a correlation coefficient (R of 0.93. We compared the predictive capacity of the general linear model (GLM versus the Artificial Neural Network model (ANN for the estimation of the weights of blue crabs from independent field data. The results indicated the higher performance capacity of the ANN to predict weights compared to the GLM (R=0.97 vs. R=0.95, raw variable when evaluated against independent field data.

  12. Conservation in the first internal transcribed spacer (ITS1) region of Hematodinium perezi (genotype III) from Callinectes sapidus .

    Science.gov (United States)

    Pagenkopp Lohan, Katrina M; Small, Hamish J; Shields, Jeffrey D; Place, Allen R; Reece, Kimberly S

    2013-03-13

    Hematodinium spp. infections have been reported from blue crabs Callinectes sapidus in high-salinity waters of the USA from New Jersey to Texas. Recently, H. perezi (genotype III) has been proposed as the parasite species and genotype infecting blue crabs from Virginia; however, it is unknown whether this same genotype is present in blue crabs from other locations. To address this question, we collected 317 blue crabs from Massachusetts, Virginia, Georgia, Florida, Louisiana, and Texas to test for the presence of H. perezi (III) using a specific PCR assay targeting the first internal transcribed spacer (ITS1) region of the ribosomal RNA gene complex. To examine the genetic variation within H. perezi (III), ITS1 region sequences from the parasite in blue crabs from multiple locations were compared to each other and to those of H. perezi (III) found in alternate hosts from Virginia. In total, 34 distinct ITS1 sequence variants of the parasite were identified from blue crabs alone, and 38 distinct variants were identified when alternate hosts were included. However, a single ITS1 sequence variant appeared in all geographic regions and hosts, and also in blue crabs sampled from a previous study. The high similarity among all the ITS1 region sequences examined (>98%) and the observation of a single variant found throughout a large geographic range, strongly suggests that a single species and genotype of Hematodinium, specifically H. perezi (III), infects blue crabs from Virginia to Texas and multiple alternate host species in Virginia.

  13. Physicochemical properties of double-stranded RNA used to discover a reo-like virus from blue crab Callinectes sapidus.

    Science.gov (United States)

    Bowers, Holly A; Messick, Gretchen A; Hanif, Ammar; Jagus, Rosemary; Carrion, Lee; Zmora, Oded; Schott, Eric J

    2010-12-07

    Mortality among blue crab Callinectes sapidus in soft shell production facilities is typically 25% or greater. The harvest, handling, and husbandry practices of soft shell crab production have the potential to spread or exacerbate infectious crab diseases. To investigate the possible role of viruses in soft shell crab mortalities, we took advantage of the physicochemical properties of double-stranded RNA (dsRNA) to isolate a putative virus genome. Further characterization confirmed the presence of a reo-like virus that possesses 12 dsRNA genome segments. The virus was present in >50% of dead or dying soft shell crabs, but fewer than 5% of healthy hard crabs. Injection of the virus caused mortality and resulted in the appearance of viral RNA and virus inclusions in hemocytes. The genome of the virus was partially sequenced and the information used to develop a reverse transcription polymerase chain reaction (RT-PCR) assay that is able to detect the virus genome in as little as 7.5 pg of total RNA. The molecular tools developed during this study will allow us to quantify prevalence of the blue crab reo-like virus in captive (soft shell facilities, aquaculture operations) and wild populations and facilitate understanding of the role this virus has in blue crab life history.

  14. Disease, parasite, and commensal prevalences for blue crab Callinectes sapidus at shedding facilities in Louisiana, USA.

    Science.gov (United States)

    Rogers, Holly A; Taylor, Sabrina S; Hawke, John P; Schott, Eric J; Anderson Lively, Julie A

    2015-01-15

    Blue crab diseases, parasites, and commensals are not well studied in the Gulf of Mexico, and their prevalence rates have only been sporadically determined. Commercial soft shell shedding facilities in Louisiana experience high mortality rates of pre-molt crabs, and some of these deaths may be attributable to diseases or parasites. During the active shedding season in 2013, we determined the prevalence of shell disease, Vibrio spp., Lagenophrys callinectes, and Hematodinium perezi at 4 commercial shedding facilities along the Louisiana coast. We also detected Ameson michaelis and reo-like virus infections. Shell disease was moderately prevalent at rates above 50% and varied by shedding facility, collection month, and crab size. Vibrio spp. bacteria were prevalent in the hemolymph of 37% of the pre-molt crabs. Lagenophrys callinectes was highly prevalent in the pre-molt crabs, but because it is a commensal species, it may not cause high mortality rates. Hematodinium perezi was absent in all pre-molt crabs.

  15. A trehalose 6-phosphate synthase gene of the hemocytes of the blue crab, Callinectes sapidus: cloning, the expression, its enzyme activity and relationship to hemolymph trehalose levels.

    Science.gov (United States)

    Chung, J Sook

    2008-12-12

    Trehalose in ectoderms functions in energy metabolism and protection in extreme environmental conditions. We structurally characterized trehalose 6-phosphate synthase (TPS) from hemocytes of the blue crab, Callinectes sapidus. C. sapidus Hemo TPS (CasHemoTPS), like insect TPS, encodes both TPS and trehalose phosphate phosphatase domains. Trehalose seems to be a major sugar, as it shows higher levels than does glucose in hemocytes and hemolymph. Increases in HemoTPS expression, TPS enzyme activity in hemocytes, and hemolymph trehalose levels were determined 24 h after lipopolysaccharide challenge, suggesting that both TPS and TPP domains of CasHemoTPS are active and functional. The TPS gene has a wide tissue distribution in C. sapidus, suggesting multiple biosynthetic sites. A correlation between TPS activity in hemocytes and hemolymph trehalose levels was found during the molt cycle. The current study provides the first evidence of presence of trehalose in hemocytes and TPS in tissues of C. sapidus and implicates its functional role in energy metabolism and physiological adaptation.

  16. Mavi Yengecin (Callinectes Sapidus Rathbun 1896) Et Verimi ve Besin Madde İçeriği Üzerine bir Araştırma

    OpenAIRE

    Atar, Hasan H.; Ölmez, Murtaza; Bekcan, Süleyman; Seçer, Selçuk

    2001-01-01

    In this research, it is aimed to determine the efficiency and the nutrient materials of its meat such as moisture, crude protein, crude fat and crude ash of blue crab (Callinectes sapidus). The mean live weigh and meat weight of blue crab was determined as 128.044±10.71 g and 24.365±2.25 g and mean meat yield was23.36±10.71 %. As a result of nutrient materials analysis it was found that the percentages of mean moisture, dry matter, crude protein, crude fat, crude ash, calcium and phosphor of ...

  17. Seasonal Variation and Meat Composition of Blue Crab (Callinectes sapidus, RATHBUN, 1896) Caught in İskenderun Bay, North-East Mediterranean

    OpenAIRE

    TÜRELİ, Canan

    2002-01-01

    The seasonal variation and meat composition of blue crabs (Callinectes sapidus Rathbun, 1896) were investigated. Twenty (10 male, 10 female) crabs were used each season. The total weight of the samples was estimated and the ratios of crude protein, lipid, dry matter and crude ash were obtained from meat of the body and claws. Comparatively higher values of dry matter, crude ash and lipid were determined for the claw meat of males in winter. In the same season the crude protein and lipid co...

  18. The Effects of Season and Sex on the Nutritional Quality of Muscle Types of Blue Crab Callinectes sapidus and Swimming Crab Portunus segnis

    OpenAIRE

    AYAS, Deniz

    2016-01-01

    The effects of season and sex on the nutritional quality of muscle types (lump crab meatLCM, claw crab meat-CCM) of swimming crab (Portunus segnis) and blue crab (Callinectes sapidus) were investigated. Carapace width, carapace length and total weight of both crab species were measured. High protein content in spring and low protein content in autumn were observed for both crab species. The levels of lipid content of both crab species were found to be similar. Higher lipid contents in spri...

  19. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae in the Southeast coast of Brazil

    Directory of Open Access Journals (Sweden)

    Evandro Severino-Rodrigues

    2013-06-01

    Full Text Available C. sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt, and cephalothorax width (CW was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne. A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50 occurred at CW=10.33cm, and the size in which all were mature (L100 was CW=11.20cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11cm of carapace width.Hay pocos estudios sobre la ecología de C. sapidus en el Atlántico Sur, a pesar de su importancia económica en la región. El presente estudio tiene como objetivo conocer la fecundidad, periodo reproductivo y talla de primera madurez morfológica de las hembras de C. sapidus, con el fin de contribuir a una mejor comprensión de la especie en el Atlántico occidental, así como ayudar en la toma de medidas de gestión en la región. Las

  20. Spontaneous alternation and locomotor activity in three species of marine crabs: green crab (Carcinus maenas), blue crab (Callinectes sapidus), and fiddler crab (Uca pugnax).

    Science.gov (United States)

    Balcı, Fuat; Ramey-Balcı, Patricia A; Ruamps, Perrine

    2014-02-01

    Spontaneous alternation refers to the tendency of organisms to explore places that they have least recently visited. Our previous work showed that alternation performance of Carcinus maenas (invasive European green crab) was significantly higher than Callinectes sapidus (native blue crab), and chance level performance (Ramey, P. A., Teichman, E., Oleksiak, J., & Balcı, F. [2009]. Spontaneous alternation in marine crabs: Invasive versus native species. Behavioural Processes, 82, 51-55.). In the current study, we first tested the robustness of these findings in the absence of visual cues, longer test durations, and wider maze dimensions. These manipulations enabled us to determine whether these two crab species relied on the visual cues provided during the spontaneous alternation task in our prior work, and allowed for better characterization of their exploratory activity in the maze. Our original findings were reproduced in the present study under these new task conditions, suggesting no role for visual cues during alternation, and emphasizing the robustness and generalizability of the corresponding interspecies differences in alternation performance. We also tested whether the lower alternation performance of C. sapidus also applied to another native crab species, Uca pugnax (fiddler crab). Spontaneous alternation performance of U. pugnax was significantly lower than C. maenas but indistinguishable from C. sapidus. Finally, we examined whether the potentially higher inherent risk-sensitivity of C. sapidus could have contributed to their lower alternation performance by testing C. maenas in the presence of a larger natural predator (stressor). Higher risk sensitivity presumably induced by the stressor led to locomotor activity patterns that better resembled those of C. sapidus, however the resultant reduction in alternation performance was not statistically significant. PsycINFO Database Record (c) 2014 APA, all rights reserved.

  1. Cloning of an insulin-like androgenic gland factor (IAG) from the blue crab, Callinectes sapidus: implications for eyestalk regulation of IAG expression.

    Science.gov (United States)

    Chung, J Sook; Manor, R; Sagi, A

    2011-08-01

    In malacostracan crustaceans, sex differentiation is uniquely regulated by a hormone secreted by the male-specific androgenic gland (AG). An isopod AG hormone was the first to be structurally elucidated and was found to belong to the insulin superfamily of proteins. Recently, it has been found that the AGs of several decapod crustaceans express insulin-like androgenic gland factors (IAGs), whose function is believed to be similar to that of the isopod AG hormone. Here we report the isolation from the blue crab Callinectes sapidus of the full-length cDNA encoding a candidate insulin-like AG hormone, termed Cas-IAG. The predicted protein Cas-IAG was encoded as a precursor consisting of a signal peptide, the B chain, the C peptide, and the A chain in that order. While the AG was the main source of Cas-IAG expression, as found in other decapod species, the hepatopancreas of male Callinectes sapidus crabs displayed minor Cas-IAG expression. Eyestalk ablation confirmed the presence of a possible endocrine axis between the eyestalk ganglia and the AG, implying that Cas-IAG expression is negatively regulated by (a) substance(s) present in the eyestalk ganglia. Copyright © 2011 Elsevier Inc. All rights reserved.

  2. Ecdysteroids regulate the levels of Molt-Inhibiting Hormone (MIH expression in the blue crab, Callinectes sapidus.

    Directory of Open Access Journals (Sweden)

    Sirinart Techa

    Full Text Available Arthropod molt is coordinated through the interplay between ecdysteroids and neuropeptide hormones. In crustaceans, changes in the activity of Y-organs during the molt cycle have been regulated by molt-inhibiting hormone (MIH and crustacean hyperglycemic hormone (CHH. Little has been known of the mode of direct effects of ecdysteroids on the levels of MIH and CHH in the eyestalk ganglia during the molt cycle. This study focused on a putative feedback of ecdysteroids on the expression levels of MIH transcripts using in vitro incubation study with ecdysteroids and in vivo RNAi in the blue crab, Callinectes sapidus. Our results show a specific expression of ecdysone receptor (EcR in which EcR1 is the major isoform in eyestalk ganglia. The initial elevation of MIH expression at the early premolt stages is replicated by in vitro incubations of eyestalk ganglia with ecdysteroids that mimic the intrinsic conditions of D0 stage: the concentration (75 ng/ml and composition (ponasterone A and 20-hydroxyecdysone at a 3:1 (w:w ratio. Additionally, multiple injections of EcR1-dsRNA reduce MIH expression by 67%, compared to the controls. Our data provide evidence on a putative feedback mechanism of hormonal regulation during molting cycle, specifically how the molt cycle is repeated during the life cycle of crustaceans. The elevated concentrations of ecdysteroids at early premolt stage may act positively on the levels of MIH expression in the eyestalk ganglia. Subsequently, the increased MIH titers in the hemolymph at postmolt would inhibit the synthesis and release of ecdysteroids by Y-organs, resulting in re-setting the subsequent molt cycle.

  3. Overwintering of the parasitic dinoflagellate Hematodinium perezi in dredged blue crabs (Callinectes sapidus) from Wachapreague Creek, Virginia.

    Science.gov (United States)

    Shields, Jeffrey D; Sullivan, Shelley E; Small, Hamish J

    2015-09-01

    Parasitic dinoflagellates in the genus Hematodinium cause disease and mortality in several commercially important marine decapod crustaceans. One species, Hematodinium perezi, occurs in blue crabs, Callinectes sapidus, along the eastern seaboard and Gulf coast of the USA. The parasite infects blue crabs, other decapods, and amphipods in the high salinity waters of coastal bays. Epizootics of the parasite often reach prevalence levels of 75-80% during outbreaks with diseased crabs dying from the infection. Prevalence of the parasite is bimodal, with a minor peak in late spring or summer, and a major peak in fall, and declining rapidly to nearly zero in late November and December. The rapid decline in infections in the late fall brings up the question of whether the parasite overwinters in crabs or whether it uses an unidentified resting stage, such as a cyst. We report observations on the prevalence of the parasite from winter dredge surveys undertaken in 2011 and 2012. Crabs were examined via hemolymph smears, histology, and PCR diagnosis for the presence of H. perezi and other pathogens. Active infections were observed from January through March in 2011 and 2012, indicating the parasite can overwinter in blue crabs. However, several crabs that were positive by PCR had presumptive effete infections that were difficult to diagnose in histological slides and hemolymph smears. These infections did not appear to be active and may have been in subsidence. Dredged crabs with light and moderate active infections were held at 15°C to determine if the parasite was capable of rapid progression. In 8 cases, infections exhibited logarithmic growth progressing rapidly over 8-12days. We present evidence that overwintering of H. perezi occurs in the blue crab hosts, that infections are capable of responding rapidly to increases in temperatures, and that overwintering provides a reservoir of infected animals for transmission to occur in the spring. Copyright © 2015 Elsevier Inc

  4. Changes in intracellular calcium concentration in crustacean (Callinectes sapidus) Y-organs: relation to the hemolymphatic ecdysteroid titer.

    Science.gov (United States)

    Chen, Hsiang-Yin; Watson, R Douglas

    2011-01-01

    Secretion of ecdysteroid molting hormones by crustacean Y-organs is negatively regulated (inhibited) by molt-inhibiting hormone (MIH), a neuropeptide produced by neurosecretory cells in eyestalk ganglia. The inhibitory effect of MIH is mediated by one or more cyclic nucleotide second messengers. In addition, available data indicate that ecdysteroidogenesis is positively regulated (stimulated) by intracellular calcium. However, despite the apparent critical role of calcium in regulating ecdysteroidogenesis, the level of Ca(2+) in Y-organs cells has not been previously determined. In studies reported here, eyestalks were ablated from blue crabs (Callinectes sapidus) to remove the endogenous source of MIH and activate Y-organs. At 0, 3, 6, and 9 days after eyestalk ablation (D0, D3, D6, and D9, respectively), the level of Ca(2+) in Y-organ cells was determined using a fluorescent calcium indicator (Fluo-4), and the hemolymphatic ecdysteroid titer was determined by radioimmunoassay. Calcium fluorescence in D6 Y-organs was 3.5-fold higher than that in D0 controls; calcium fluorescence in D9 Y-organs was 3.9-fold higher than in D0 controls (P<0.05). Measurement of fluorescence along a transect drawn through representative cells indicated that the calcium fluorescence was localized to cytoplasm and not to nuclei. Associated with the increase in intracellular Ca(2+) was a significant increase in the hemolymphatic ecdysteroid titer: The level of ecdysteroids in hemolymph rose from 5.5 ng/mL on D0 to 49.6 ng/mL on D6 and 87.2 ng/mL on D9 (P<0.05). The results are consistent with the hypothesis that ecdysteroidogenesis is stimulated by an increase in intracellular Ca(2+).

  5. Ecdysteroids regulate the levels of Molt-Inhibiting Hormone (MIH) expression in the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Techa, Sirinart; Chung, J Sook

    2015-01-01

    Arthropod molt is coordinated through the interplay between ecdysteroids and neuropeptide hormones. In crustaceans, changes in the activity of Y-organs during the molt cycle have been regulated by molt-inhibiting hormone (MIH) and crustacean hyperglycemic hormone (CHH). Little has been known of the mode of direct effects of ecdysteroids on the levels of MIH and CHH in the eyestalk ganglia during the molt cycle. This study focused on a putative feedback of ecdysteroids on the expression levels of MIH transcripts using in vitro incubation study with ecdysteroids and in vivo RNAi in the blue crab, Callinectes sapidus. Our results show a specific expression of ecdysone receptor (EcR) in which EcR1 is the major isoform in eyestalk ganglia. The initial elevation of MIH expression at the early premolt stages is replicated by in vitro incubations of eyestalk ganglia with ecdysteroids that mimic the intrinsic conditions of D0 stage: the concentration (75 ng/ml) and composition (ponasterone A and 20-hydroxyecdysone at a 3:1 (w:w) ratio). Additionally, multiple injections of EcR1-dsRNA reduce MIH expression by 67%, compared to the controls. Our data provide evidence on a putative feedback mechanism of hormonal regulation during molting cycle, specifically how the molt cycle is repeated during the life cycle of crustaceans. The elevated concentrations of ecdysteroids at early premolt stage may act positively on the levels of MIH expression in the eyestalk ganglia. Subsequently, the increased MIH titers in the hemolymph at postmolt would inhibit the synthesis and release of ecdysteroids by Y-organs, resulting in re-setting the subsequent molt cycle.

  6. BIOCHEMICAL AND ULTRASTRUCTURAL ASPECTS OF CA2+ TRANSPORT BY MITOCHONDRIA OF THE HEPATOPANCREAS OF THE BLUE CRAB CALLINECTES SAPIDUS

    Science.gov (United States)

    Chen, Chung-Ho; Greenawalt, John W.; Lehninger, Albert L.

    1974-01-01

    Mitochondria isolated from the hepatopancreas of the blue crab Callinectes sapidus show up to 12-fold stimulation of respiration on addition of Ca2+, which is accompanied by Ca2+ accumulation (Ca2+:site = 1.9) and H+ ejection (H+:Ca2+ = 0.85). Sr2+ and Mn2+ are also accumulated; Mg2+ is not. A strongly hypertonic medium (383 mosM), Mg2+, and phosphate are required for maximal Ca2+ uptake. Ca2+ uptake takes precedence over oxidative phosphorylation of ADP for respiratory energy. Once Ca2+ is accumulated by the crab mitochondria, it is stable and only very slowly released, even by uncoupling agents. ATP hydrolysis also supports Ca2+ uptake. Respiration-inhibited crab hepatopancreas mitochondria show both high-affinity and low-affinity Ca2+-binding sites, which are inactive in the presence of uncoupling agents. Crab hepatopancreas mitochondria have an enormous capacity for accumulation of Ca2+, up to 5,500 ng-atoms Ca2+ per mg protein, with an equivalent amount of phosphate. Freshly isolated mitochondria contain very large amounts of Ca2+, Mg2+, phosphate, K+, and Na+; their high Ca2+ content is a reflection of the vary large amount of extra-mitochondrial Ca2+ in the whole tissue. Electron microscopy of crab mitochondria loaded with Ca2+ and phosphate showed large electron-dense deposits, presumably of precipitated calcium phosphate. They consisted of bundles of needle-like crystals, whereas Ca2+-loaded rat liver mitochondria show only amorphous deposits of calcium phosphate under similar conditions. The very pronounced capacity of crab hepatopancreas mitochondria for transport of Ca2+ appears to be adapted to a role in the storage and release of Ca2+ during the molting cycle of this crustacean. PMID:4827906

  7. The Effects of Acute Copper and Ammonia Challenges on Ammonia and Urea Excretion by the Blue Crab Callinectes sapidus.

    Science.gov (United States)

    Zimmer, Alex M; Jorge, Marianna Basso; Wood, Chris M; Martins, Camila M G; Bianchini, Adalto

    2017-04-01

    Copper (Cu) is a persistent environmental contaminant that elicits several physiological disturbances in aquatic organisms, including a disruption in ammonia regulation. We hypothesized that exposure to Cu in a model crustacean (blue crab, Callinectes sapidus) acclimated to brackish water (2 ppt) would lead to hyperammonemia by stimulating an increase in ammonia production and/or by inhibiting ammonia excretion. We further hypothesized that urea production would represent an ammonia detoxification strategy in response to Cu. In a pilot experiment, exposure to 0, 100, and 200 µg/L Cu for 6 h caused significant concentration-dependent increases in ammonia excretion (J amm ). Based on these results, an acute 24-h 100 µg/L Cu exposure was conducted and this similarly caused an overall stimulation of J amm during the 24-h period, indicative of an increase in ammonia production. Terminal haemolymph total ammonia content (T amm ) was unchanged, suggesting that while ammonia production was increased, there was no inhibition of the excretion mechanism. In support of our second hypothesis, urea excretion (J urea ) increased in response to Cu exposure; haemolymph [urea] was unaffected. This suggested that urea production also was increased. To further test the hypothesis that J urea increased to prevent hyperammonemia during Cu exposure, crabs were exposed to high environmental ammonia (HEA; 2.5 mmol/L NH 4 HCO 3 ) for 12 h in a separate experiment. This led to a fourfold increase in haemolymph T amm , whereas J urea increased only transiently and haemolymph [urea] was unchanged, indicating that urea production likely does not contribute to the attenuation of hyperammonemia in blue crabs. Overall, Cu exposure in blue crabs led to increased ammonia and urea production, which were both eliminated by excretion. These results may have important implications in aquaculture systems where crabs may be exposed to elevated Cu and/or ammonia.

  8. Management of fisheries by Total Allowable Catch (TAC) regulation ...

    African Journals Online (AJOL)

    spamer

    hulled, ocean-going vessels. Rock lobsters are either tailed, packed and frozen on board, or kept alive ..... The shift in management strategy during the 2000/01 fishing season, from a solely TAC-managed fishery .... MADDOX 1998 — A review of the fishery and biology of the blue crab, Callinectes sapidus, in South Carolina.

  9. A second copper zinc superoxide dismutase (CuZnSOD) in the blue crab Callinectes sapidus: cloning and up-regulated expression in the hemocytes after immune challenge.

    Science.gov (United States)

    Sook Chung, J; Bachvaroff, T R; Trant, J; Place, A

    2012-01-01

    The full-length cDNA (1362 nucleotides, GenBank JF736621) encoding an extracellular copper zinc superoxide dismutase initially isolated from an EST library of the blue crab Callinectes sapidus was characterized using 3' RACE and named Cas-ecCuZnSOD-2. The open reading frame of Cas-ecCuZnSOD-2 contains 203 deduced amino acids with the conserved active catalytic center for copper and zinc binding and the post-translational modification at two putative N-glycosylation and nine phosphorylation sites. Overall, the deduced amino acids of Cas-ecCuZnSOD-2 shared only 35% sequence identity with that of Cas-ecCuZnSOD (GenBank AF264031) which was previously found in C. sapidus, while it showed ∼75% sequence identity to Scylla paramamosain ecCuZnSOD (GenBank FJ774661). The expression profile of Cas-ecCuZnSOD-2 and the other three C. sapidus SODs: ecCuZn, cytMn- and mitMn SODs was largely ubiquitous among the tested tissues obtained from a juvenile female at intermolt: brain, eyestalk ganglia, pericardial organs, and thoracic ganglia complex (nervous system); hepatopancreas (digestive system); heart, artery and hemocytes (circulatory system); gill and antennal gland (excretory system), hypodermis, and Y-organ (endocrine organ). Our study reports, for the first time in the crustaceans, expression analyses for all four Cas-SODs in hemocytes after immune challenges. Crabs challenged with lipopolysaccharides (LPS) injection had a remarkable induction of Cas-ecCuZnSOD-2 expression along with three other SODs in hemocytes, suggesting that Cas-SODs including Cas-ecCuZnSOD-2 are involved in the defense system, possibly innate immunity and immunocompetency of C. sapidus. Copyright © 2011 Elsevier Ltd. All rights reserved.

  10. Trehalose metabolism in the blue crab Callinectes sapidus: isolation of multiple structural cDNA isoforms of trehalose-6-phosphate synthase and their expression in muscles.

    Science.gov (United States)

    Shi, Q; Chung, J Sook

    2014-02-15

    Adult blue crab Callinectes sapidus exhibit behavioral and ecological dimorphisms: females migrating from the low salinity water to the high salinity area vs. males remaining in the same areas. The flesh basal muscle of the swimming paddle shows a dimorphic color pattern in that levator (Lev) and depressor (Dep) of females tend to be much darker than those of males, while both genders have the same light colored remoter (Rem) and promoter (Pro). The full-length cDNA sequence of four structural isoforms of trehalose-6-phosphate synthase (TPS) is isolated from chela muscles of an adult female, C. sapidus. Two isoforms of the C. sapidus TPS encode functional domains of TPS and trehalose-6-phosphorylase (TPP) in tandem as a fused gene product of Escherichia coli Ost A and Ost B. The other two isoforms contain only a single TPS domain. In both males and females, the darker (Lev+Dep) muscles exhibit greater amounts of trehalose, TPS and trehalase activities than the light colored (Rem+Pro). The fact that adult females show higher levels of trehalase activity in the basal muscles and of glucose in Lev+Dep than those of adult males suggests that there may be a metabolic dimorphism. Moreover, the involvement of trehalose in energy metabolism that was examined under the condition of strenuous swimming activity mimicked in adult females demonstrates the intrinsic trehalose metabolism in Lev+Dep, which subsequently results in hemolymphatic hyperglycemia and hyperlactemia. Our data support that trehalose serves as an additional carbohydrate source of hemolymphatic hyperglycemia in this species. Behavioral and ecological dimorphisms of C. sapidus adults may be supported by a functional dimorphism in energy metabolism. Copyright © 2013 Elsevier B.V. All rights reserved.

  11. Genome sequence analysis of CsRV1, a pathogenic reovirus that infects the blue crab Callinectes sapidus across its trans-hemispheric range

    Directory of Open Access Journals (Sweden)

    Emily Maya Flowers

    2016-02-01

    Full Text Available The blue crab, Callinectes sapidus (Rathbun 1896, which is a commercially important trophic link in coastal ecosystems of the western Atlantic, is infected in both North and South America by C. sapidus Reovirus 1 (CsRV1, a double stranded RNA virus. The 12 genome segments of a North American strain of CsRV1 were sequenced using Ion Torrent technology. Putative functions could be assigned for 3 of the 13 proteins encoded in the genome, based on their similarity to proteins encoded in other reovirus genomes. Comparison of the CsRV1 RNA dependent RNA polymerase (RdRP sequence to genomes of other crab-infecting reoviruses shows that it is similar to the MCRV virus found in Scylla serrata, mud crab, and WX-2012 in Eriocheir sinensis, Chinese mitten crab, and supports the idea that there is a distinct Crabreo genus, different from Seadornavirus and Cardoreovirus, the two closest genera in the Reoviridae. A region of 98% nucleotide sequence identity between CsRV1 and the only available sequence of the P virus of Macropipus depurator suggests that these two viruses may be closely related. An 860 nucleotide region of the CsRV1 RdRP gene was amplified and sequenced from 15 infected crabs collected from across the geographic range of C. sapidus. Pairwise analysis of predicted protein sequences shows that CsRV1 strains in Brazil can be distinguished from those in North America based on conserved residues in this gene. The sequencing, annotation, and preliminary population metrics of the genome of CsRV1 should facilitate additional studies in diverse disciplines, including structure-function relationships of reovirus proteins, investigations into the evolution of the Reoviridae, and biogeographic research on the connectivity of C. sapidus populations across the Northern and Southern hemispheres.

  12. The role of alternate hosts in the ecology and life history of Hematodinium sp., a parasitic dinoflagellate of the blue crab (Callinectes sapidus).

    Science.gov (United States)

    Lohan, Katrina M Pagenkopp; Reece, Kimberly S; Miller, Terrence L; Wheeler, Kersten N; Small, Hamish J; Shields, Jeffrey D

    2012-02-01

    Hematodinium sp. infections are relatively common in some American blue crab (Callinectes sapidus) populations in estuaries of the western Atlantic Ocean. Outbreaks of disease caused by Hematodinium sp. can be extensive and can cause substantial mortalities in blue crab populations in high salinities. We examined several species of crustaceans to determine if the same species of Hematodinium that infects C. sapidus is found in other crustaceans from the same localities. Over a 2-yr period, 1,829 crustaceans were collected from the Delmarva Peninsula, Virginia, examined for the presence of infections. A portion of the first internal transcribed spacer (ITS1) region of the ribosomal RNA (rRNA) gene complex from Hematodinium sp. was amplified and sequences were compared among 35 individual crustaceans putatively infected with the parasite, as determined by microscopic examination, and 4 crustaceans putatively infected based only on PCR analysis. Of the 18 crustacean species examined, 5 were infected with Hematodinium sp. after microscopic examination and PCR analysis, including 3 new host records, and an additional species was positive only via PCR analysis. The ITS1 rRNA sequences of Hematodinium sp. from the infected crustaceans were highly similar to each other and to that reported from C. sapidus (>98%). The similarity among these ITS1 sequences and similarities in the histopathology of infected hosts is evidence that the same species of Hematodinium found in C. sapidus infects a broad range of crustaceans along the Delmarva Peninsula. Our data indicate that the species of Hematodinium found in blue crabs from estuaries along the east coast of North America is a host generalist, capable of infecting hosts in different families within the Order Decapoda. Additionally, evidence indicates that it may be capable of infecting crustaceans within the Order Amphipoda.

  13. Genome Sequence Analysis of CsRV1: A Pathogenic Reovirus that Infects the Blue Crab Callinectes sapidus Across Its Trans-Hemispheric Range.

    Science.gov (United States)

    Flowers, Emily M; Bachvaroff, Tsvetan R; Warg, Janet V; Neill, John D; Killian, Mary L; Vinagre, Anapaula S; Brown, Shanai; Almeida, Andréa Santos E; Schott, Eric J

    2016-01-01

    The blue crab, Callinectes sapidus Rathbun, 1896, which is a commercially important trophic link in coastal ecosystems of the western Atlantic, is infected in both North and South America by C. sapidus Reovirus 1 (CsRV1), a double stranded RNA virus. The 12 genome segments of a North American strain of CsRV1 were sequenced using Ion Torrent technology. Putative functions could be assigned for 3 of the 13 proteins encoded in the genome, based on their similarity to proteins encoded in other reovirus genomes. Comparison of the CsRV1 RNA-dependent RNA polymerase (RdRP) sequence to genomes of other crab-infecting reoviruses shows that it is similar to the mud crab reovirus found in Scylla serrata and WX-2012 in Eriocheir sinensis, Chinese mitten crab, and supports the idea that there is a distinct "Crabreo" genus, different from Seadornavirus and Cardoreovirus, the two closest genera in the Reoviridae. A region of 98% nucleotide sequence identity between CsRV1 and the only available sequence of the P virus of Macropipus depurator suggests that these two viruses may be closely related. An 860 nucleotide region of the CsRV1 RdRP gene was amplified and sequenced from 15 infected crabs collected from across the geographic range of C. sapidus. Pairwise analysis of predicted protein sequences shows that CsRV1 strains in Brazil can be distinguished from those in North America based on conserved residues in this gene. The sequencing, annotation, and preliminary population metrics of the genome of CsRV1 should facilitate additional studies in diverse disciplines, including structure-function relationships of reovirus proteins, investigations into the evolution of the Reoviridae, and biogeographic research on the connectivity of C. sapidus populations across the Northern and Southern hemispheres.

  14. Crescimento de Callinectes sapidus (Crustacea, Decapoda, Portunidae no estuário da laguna dos Patos, RS, Brasil

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    Leonardo S. Ferreira

    2008-03-01

    Full Text Available Utilizando o método de deslocamento modal para a identificação das idades, estimou-se o crescimento do siri-azul Callinectes sapidus Rathbun, 1896 em duas áreas de pesca no estuário da Lagoa dos Patos. Os indivíduos foram coletados entre fevereiro de 2005 e março de 2006 no Saco da Mangueira e Saco do Arraial por meio de arrasto de rede de portas da pesca artesanal. Coletou-se um total de 2.609 animais, sendo 1.193 machos e 1.416 fêmeas. Para obtenção das curvas de crescimento utilizou-se o modelo de von Bertalanffy. As curvas foram validadas pela sua adequação ao ciclo de vida e aspectos biológicos da espécie. O tamanho máximo de largura de carapaça (LCmáx utilizado foi mantido fixo em todas as análises (LCmáx=162,71mm; ± d.p.=3,10 para machos e LCmáx=157,78mm; ± d.p.=5,45 para fêmeas, sendo esses valores médios das maiores medidas obtidas em mais de 20 anos de coletas no estuário. Os parâmetros de crescimento e longevidade foram estimados para machos (Saco da Mangueira, K=0,0039/dia; t o=-6.07; 1.195 dias; Saco do Arraial, K=0,0041/dia; t o=-5,84; 1.102 dias e fêmeas (Saco da Mangueira, K=0,0040/dia; t o=-6,22; 1.153 dias; Saco do Arraial, K=0,0039/dia; t o=-5.91; 1.181 dias. As curvas de crescimento estimadas nesse trabalho denotam que a espécie atinge o tamanho mínimo de captura praticamente no primeiro ano de vida (120mm.

  15. Impact of molt-disrupting BDE-47 on epidermal ecdysteroid signaling in the blue crab, Callinectes sapidus, in vitro.

    Science.gov (United States)

    Booth, Ashley; Zou, Enmin

    2016-08-01

    Polybrominated diphenyl ethers (PBDEs) are environmentally pervasive flame retardants that have been linked with endocrine disruption in a variety of organisms. BDE-47, one of the most prevalent congeners found in aquatic environments, has recently been shown to inhibit crustacean molting, but little is known about the specific mechanism through which molt-inhibition occurs. This study examined whether the inhibitory effect on molting arises from the disruption of hormone signaling in the epidermis using the blue crab, Callinectes sapidus, as the model crustacean. First, we partially sequenced cDNA of N-acetyl-β-glucosaminidase (NAG) from the epidermis, a terminal enzyme in the molting hormone-signaling cascades that is commonly used as the biomarker for ecdysteroid signaling. This partial cDNA sequence was then used to create primers for quantification of NAG gene expression. Then, a new tissue culture technique was developed and dubbed the epidermis-with-exoskeleton (EWE) method, wherein epidermal tissue, along with the overlying exoskeleton, is immersed in a medium of physiologically relevant osmolarity. Using this EWE tissue culture method, we assessed the inducibility of NAG mRNA by 20-hydroxyecdysone (20-HE) in vitro. Exposures to 1μM 20-HE were found to induce NAG mRNA at a significantly higher level than the control. Using NAG expression as a biomarker for ecdysteroid signaling, the effects of BDE-47 were measured. BDE-47 alone at 100nM and a combination of 1μM BDE-47 and 1μM 20-HE were found to significantly increase NAG mRNA. A trend of increasing NAG gene expression in the binary BDE-47 exposure as compared to 1μM BDE-47 and 1μM 20-HE alone is suggestive of a synergistic effect of these two chemicals on ecdysteroid signaling in the cultured epidermis. Discussion on the mechanism for inhibition of crustacean molting by BDE-47 is presented. Copyright © 2016 Elsevier B.V. All rights reserved.

  16. De novo assembly of a transcriptome from juvenile blue crabs (Callinectes sapidus) following exposure to surrogate Macondo crude oil.

    Science.gov (United States)

    Yednock, Bree K; Sullivan, Timothy J; Neigel, Joseph E

    2015-07-11

    The blue crab, Callinectes sapidus, is economically and ecologically important in western Atlantic and Gulf of Mexico coastal estuaries. In 2010 blue crabs in the northern Gulf of Mexico were exposed to crude oil and chemical dispersants from the Deepwater Horizon oil spill. To characterize the blue crab transcriptome and identify genes that could be regulated in response to oil exposure we sequenced transcriptomes from hepatopancreas and gill tissues of juvenile blue crabs after exposing them to a water-accommodated fraction of surrogate Macondo crude oil in the laboratory and compared them to transcriptomes from an unexposed control group. Illumina sequencing provided 42.5 million paired-end sequencing reads for the control group and 44.9 million paired-end reads for the treatment group. From these, 73,473 transcripts and 52,663 genes were assembled. Comparison of control and treatment transcriptomes revealed about 100 genes from each tissue type that were differentially expressed. However, a much larger number of transcripts, approximately 2000 from each tissue type, were differentially expressed. Several examples of alternatively spliced transcripts were verified by qPCR, some of which showed significantly different expression patterns. The combined transcriptome from all tissues and individuals was annotated to assign putative gene products to both major gene ontology categories as well as specific roles in responses to cold and heat, metabolism of xenobiotic compounds, defence, hypoxia, osmoregulation and ecdysis. Among the annotations for upregulated and alternatively-spliced genes were candidates for the metabolism of oil-derived compounds. Previously, few genomic resources were available for blue crabs or related brachyuran crabs. The transcriptome sequences reported here represent a major new resource for research on the biology of blue crabs. These sequences can be used for studies of differential gene expression or as a source of genetic markers. Genes

  17. Effects of salinity on the accumulation of hemocyte aggregates and bacteria in the gills of Callinectes sapidus, the Atlantic blue crab, injected with Vibrio campbellii.

    Science.gov (United States)

    Ikerd, Jennifer L; Burnett, Karen G; Burnett, Louis E

    2015-05-01

    In addition to respiration and ion regulation, crustacean gills accumulate and eliminate injected particles, along with hemocyte aggregates that form in response to those particles. Here we report that the dose of Vibrio campbellii previously shown to induce a decrease in respiration and hemolymph flow across the gill in the Atlantic blue crab, Callinectes sapidus, also triggered the formation of aggregates containing four or more hemocytes in the gills, compared with saline-injected controls. More bacteria were trapped and rendered non-culturable per unit weight by anterior respiratory gills than posterior gills specialized for ion regulation. Further, more bacteria accumulated in the anterior gills of animals held at 30 ppt than those at 10 ppt. Thus, the role of the gills in immune defense comes at an energetic cost to this and likely to other crustaceans; this cost is influenced by acclimation salinity and the position and specialized function of individual gills. Copyright © 2014 Elsevier Inc. All rights reserved.

  18. The Effects of Season and Sex on the Nutritional Quality of Muscle Types of Blue Crab Callinectes sapidus and Swimming Crab Portunus segnis

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    Deniz Ayas

    2016-05-01

    Full Text Available The effects of season and sex on the nutritional quality of muscle types (lump crab meatLCM, claw crab meat-CCM of swimming crab (Portunus segnis and blue crab (Callinectes sapidus were investigated. Carapace width, carapace length and total weight of both crab species were measured. High protein content in spring and low protein content in autumn were observed for both crab species. The levels of lipid content of both crab species were found to be similar. Higher lipid contents in spring and winter, lower lipid contents in summer and autumn for both sexes were found. Although both crab species contain small amounts of fat, they are good sources of n-3 PUFA content (especially EPA and DHA for all seasons regardless of sex and muscle types.

  19. The effects of fipronil and the photodegradation product fipronil desulfinyl on growth and gene expression in juvenile blue crabs, Callinectes sapidus, at different salinities

    Science.gov (United States)

    Goff, Andrew D.; Saranjampour, Parichehr; Ryan, Lauren M.; Hladik, Michelle; Covi, Joseph A.; Armbrust, Kevin L.; Brander, Susanne M.

    2017-01-01

    Endocrine disrupting compounds (EDCs) are now widely established to be present in the environment at concentrations capable of affecting wild organisms. Although many studies have been conducted in fish, less is known about effects in invertebrates such as decapod crustaceans. Decapods are exposed to low concentrations of EDCs that may cause infertility, decreased growth, and developmental abnormalities. The objective herein was to evaluate effects of fipronil and its photodegradation product fipronil desulfinyl. Fipronil desulfinyl was detected in the eggs of the decapod Callinectes sapidus sampled off the coast of South Carolina. As such, to examine specific effects on C. sapidus exposed in early life, we exposed laboratory-reared juveniles to fipronil and fipronil desulfinyl for 96 hours at three nominal concentrations (0.01, 0.1, 0.5 μg/L) and two different salinities (10, 30 ppt). The size of individual crabs (weight, carapace width) and the expression of several genes critical to growth and reproduction were evaluated. Exposure to fipronil and fipronil desulfinyl resulted in significant size increases in all treatments compared to controls. Levels of expression for vitellogenin (Vtg), an egg yolk precursor, and the ecdysone receptor (EcR), which binds to ecdysteroids that control molting, were inversely correlated with increasing fipronil and fipronil desulfinyl concentrations. Effects on overall growth and on the expression of EcR and Vtg differ depending on the exposure salinity. The solubility of fipronil is demonstrated to decrease considerably at higher salinities. This suggests that fipronil and its photodegradation products may be more bioavailable to benthic organisms as salinity increases, as more chemical would partition to tissues. Our findings suggest that endocrine disruption is occurring through alterations to gene expression in C. sapidus populations exposed to environmental levels of fipronil, and that effects may be dependent upon the

  20. Trophic flexibility of the Atlantic blue crab Callinectes sapidus in invaded coastal systems of the Apulia region (SE Italy): A stable isotope analysis

    Science.gov (United States)

    Mancinelli, Giorgio; Teresa Guerra, Maria; Alujević, Karla; Raho, Davide; Zotti, Maurizio; Vizzini, Salvatrice

    2017-11-01

    The Atlantic blue crab Callinectes sapidus is recognized as an Invasive Alien Species in the Mediterranean Sea. However, its trophic role and feeding flexibility in invaded benthic food webs have been addressed only recently. Here, field samplings were conducted in winter and summer in five coastal systems of the Apulia region (SE Italy), three located on the Ionian Sea (Mar Piccolo, Torre Colimena, and Spunderati) and two on the Adriatic Sea (Acquatina and Alimini Grande). Captured blue crabs were weighed and had their δ13C and δ15N isotopic signatures measured; their trophic level (TL) was estimated using the mussel Mytilus galloprovincialis as isotopic baseline. C. sapidus abundances varied greatly across systems and seasons, and in Adriatic systems the species was not collected in winter. Trophic levels showed significant spatial and temporal variations, although with no general pattern. In winter, the Mar Piccolo population showed the highest TL values; the lowest estimates were in Torre Colimena and Spunderati, where crabs showed δ13C signatures significantly higher than mussels, suggesting the contribution of 13C-enriched plant material in the diet. In summer, with the exception of the Mar Piccolo, Ionian populations increased their trophic level; both Adriatic populations were characterized by the lowest TL estimates. The analysis performed at the individual scale further indicated body weight-related changes in trophic level. For the Torre Colimena population, in particular, a hump-shaped pattern was observed in both seasons. The present study highlighted a considerable spatial and temporal trophic flexibility of C. sapidus at the population scale, while at the individual scale size-related shifts in trophic level were observed. The ability of the blue crab to vary its energy sources in relation with season, local environmental conditions, and ontogenetic stage is emphasized, suggesting that it may represent a key determinant of its invasion success.

  1. The effects of fipronil and the photodegradation product fipronil desulfinyl on growth and gene expression in juvenile blue crabs, Callinectes sapidus, at different salinities.

    Science.gov (United States)

    Goff, Andrew D; Saranjampour, Parichehr; Ryan, Lauren M; Hladik, Michelle L; Covi, Joseph A; Armbrust, Kevin L; Brander, Susanne M

    2017-05-01

    Endocrine disrupting compounds (EDCs) are now widely established to be present in the environment at concentrations capable of affecting wild organisms. Although many studies have been conducted in fish, less is known about effects in invertebrates such as decapod crustaceans. Decapods are exposed to low concentrations of EDCs that may cause infertility, decreased growth, and developmental abnormalities. The objective herein was to evaluate effects of fipronil and its photodegradation product fipronil desulfinyl. Fipronil desulfinyl was detected in the eggs of the decapod Callinectes sapidus sampled off the coast of South Carolina. As such, to examine specific effects on C. sapidus exposed in early life, we exposed laboratory-reared juveniles to fipronil and fipronil desulfinyl for 96h at three nominal concentrations (0.01, 0.1, 0.5μg/l) and two different salinities (10, 30ppt). The size of individual crabs (weight, carapace width) and the expression of several genes critical to growth and reproduction were evaluated. Exposure to fipronil and fipronil desulfinyl resulted in significant size increases in all treatments compared to controls. Levels of expression for vitellogenin (Vtg), an egg yolk precursor, and the ecdysone receptor (EcR), which binds to ecdysteroids that control molting, were inversely correlated with increasing fipronil and fipronil desulfinyl concentrations. Effects on overall growth and on the expression of EcR and Vtg differ depending on the exposure salinity. The solubility of fipronil is demonstrated to decrease considerably at higher salinities. This suggests that fipronil and its photodegradation products may be more bioavailable to benthic organisms as salinity increases, as more chemical would partition to tissues. Our findings suggest that endocrine disruption is occurring through alterations to gene expression in C. sapidus populations exposed to environmental levels of fipronil, and that effects may be dependent upon the salinity at

  2. Distribución espacial y temporal del cangrejo Callinectes sapidus (Decapoda: Portunidae en la Bahía de Chetumal, Quintana Roo, México

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    Héctor J Ortiz-León

    2007-03-01

    Full Text Available Para determinar los patrones de distribución espacial y temporal de Callinectes sapidus, se realizaron muestreos durante las temporadas climáticas de nortes (enerofebrero, secas (mayo-junio y lluvias (agosto-septiembre de 2002, en 30 estaciones de muestreo de la Bahía de Chetumal, agrupados en los sectores A (14 estaciones, B (ocho estaciones y C (ocho estaciones. Para recolectar las jaibas se colocaron en cada sitio de muestreo dos transectos paralelos a la costa, con tres trampas cada uno, separadas 30 m una de otra. Se recolecciónron 1 031 ejemplares de C. sapidus. La CPUE difirió espacial y temporalmente. La mayor CPUE fue encontrada en el sector C, con 1.3 ind∙trampa-1, y en la temporada climática de lluvias, con 1.1 ind∙trampa-1. La población estuvo compuesta predominantemente de individuos machos. La relación macho: hembra fue 15:1. La CPUE de machos y de adultos (grupo II fue significativamente diferente entre sectores y entre temporadas climáticas. Ambos presentaron resultados similares, registrando la mayor CPUE en el sector C (1.2 ind∙trampa-1 y en la temporada climática de lluvias (1.1 ind∙trampa-1. La CPUE de hembras y de jóvenes del grupo I fue escasa durante el período de muestreo, mientras que la de jóvenes del grupo 0, fue nula. La mayor frecuencia relativa entre los sectores y las temporadas climáticas se observó en los intervalos de talla (AC de 130-139 mm y 140-149 mm. C. sapidus se presentó en los sedimentos arenosos de la Bahía de Chetumal. La correlación producto momento de Pearson mostró relaciones significativas entre la CPUE de C. sapidus con la temperatura, salinidad y el oxígeno disuelto. Los patrones de distribución espacial y temporal mostrados por C. sapidus en la Bahía de Chetumal parecen estar relacionados con las características de salinidad, temperatura, protección, alimentación, reclutamiento y los eventos reproductivos.Temporal and spatial distribution of the crab Callinectes

  3. Changes in ecdysteroid levels and expression patterns of ecdysteroid-responsive factors and neuropeptide hormones during the embryogenesis of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Techa, Sirinart; Alvarez, Javier V; Sook Chung, J

    2015-04-01

    Embryogenesis requires the involvement and coordination of multiple networks of various genes, according to a timeline governing development. Crustacean embryogenesis usually includes the first molt, a process that is known to be positively controlled by ecdysteroids. We determined the amounts of ecdysteroids, as well as other related factors: the ecdysone receptor (CasEcR), the retinoid X receptor (CasRXR), the molt-inhibiting hormone (CasMIH), and crustacean hyperglycemic hormone (CasCHH) during the ovarian and embryonic developments of Callinectes sapidus. In summary, the ovaries at stages 1-4 have expression levels of maternal CasEcR and CasRXR 10-50 times higher than levels seen in embryos at the yolk stage. This large difference in the amount of the these factors in C. sapidus ovaries suggests that these maternal ecdysteroid-responsive factors may be utilized at the initiation of embryogenesis. During embryogenesis, the changes in total ecdysteroids and levels of CasEcR and CasRXR expression are similar to those observed in juvenile molts. The full-length cDNA sequence of the C. sapidus BTB domain protein (CasBTBDP) initially isolated from Y-organ cDNA, contains only Broad-Complex, Tramtrack, and Bric a brac (BTB) domains. The levels of CasBTBDP are kept constant throughout embryogenesis. The expression profiles of CasMIH and CasCHH are similar to the titers of ecdysteroids. However, the timing of their appearance is followed by increases in CasEcRs and CasRXRs, implying that the expressions of these neuropeptides may be influenced by ecdysteroids. Moreover, the ecdysteroid profile during embryogenesis may track directly with the timing of organogenesis of Y-organs and their activity. Our work reports, for first time, the observed expression and changes of ecdysteroid-responsive factors, along with CasCHH and CasMIH, during embryogenesis in the crustacean C. sapidus. Copyright © 2014 Elsevier Inc. All rights reserved.

  4. Salinity-induced changes in gene expression from anterior and posterior gills of Callinectes sapidus (Crustacea: Portunidae) with implications for crustacean ecological genomics.

    Science.gov (United States)

    Havird, Justin C; Mitchell, Reed T; Henry, Raymond P; Santos, Scott R

    2016-09-01

    Decapods represent one of the most ecologically diverse taxonomic groups within crustaceans, making them ideal to study physiological processes like osmoregulation. However, prior studies have failed to consider the entire transcriptomic response of the gill - the primary organ responsible for ion transport - to changing salinity. Moreover, the molecular genetic differences between non-osmoregulatory and osmoregulatory gill types, as well as the hormonal basis of osmoregulation, remain underexplored. Here, we identified and characterized differentially expressed genes (DEGs) via RNA-Seq in anterior (non-osmoregulatory) and posterior (osmoregulatory) gills during high to low salinity transfer in the blue crab Callinectes sapidus, a well-studied model for crustacean osmoregulation. Overall, we confirmed previous expression patterns for individual ion transport genes and identified novel ones with salinity-mediated expression. Notable, novel DEGs among salinities and gill types for C. sapidus included anterior gills having higher expression of structural genes such as actin and cuticle proteins while posterior gills exhibit elevated expression of ion transport and energy-related genes, with the latter likely linked to ion transport. Potential targets among recovered DEGs for hormonal regulation of ion transport between salinities and gill types included neuropeptide Y and a KCTD16-like protein. Using publically available sequence data, constituents for a "core" gill transcriptome among decapods are presented, comprising genes involved in ion transport and energy conversion and consistent with salinity transfer experiments. Lastly, rarefication analyses lead us to recommend a modest number of sequence reads (~10-15M), but with increased biological replication, be utilized in future DEG analyses of crustaceans. Copyright © 2016 Elsevier Inc. All rights reserved.

  5. Molt-inhibiting hormone stimulates vitellogenesis at advanced ovarian developmental stages in the female blue crab, Callinectes sapidus 1: an ovarian stage dependent involvement.

    Science.gov (United States)

    Zmora, Nilli; Trant, John; Zohar, Yonathan; Chung, J Sook

    2009-07-07

    To understand the hormonal coordination of the antagonism between molting and reproduction in crustaceans, the terminally anecdysial mature female Callinectes sapidus was used as a model. The regulatory roles of crustacean hyperglycemic hormone (CHH) and molt-inhibiting hormone (MIH) in vitellogenesis were examined. A competitive specific RIA was used to measure the levels of MIH and CHH in the hemolymphs of mature females at pre- and mid- vitellogenic stages, and their effects on vitellogenesis at early (early 2, E2) and mid vitellogenesis (3) stages were determined in vitro. A hepatopancreas fragments incubation system was developed and the levels of vitellogenin (VtG), as well as VtG mRNA and heterogeneous nuclear (hn)VtG RNA were determined using RIA or QPCR, respectively. MIH titers were four times higher at mid-vitellogenesis than at pre-vitellogenesis, while CHH levels in the hemolymph were constant. In the in vitro incubation experiments, MIH increased both VtG mRNA levels and secretion at ovarian stage 3. At stage E2, however, MIH resulted in a mixed response: downregulation of VtG mRNA and upregulation of hnVtG RNA. CHH had no effect on any of the parameters. Actinomycin D blocked the stimulatory effects of MIH in stage 3 animals on VtG mRNA and VtG, while cycloheximide attenuated only VtG levels, confirming the MIH stimulatory effect at this stage. MIH is a key endocrine regulator in the coordination of molting and reproduction in the mature female C. sapidus, which simultaneously inhibits molt and stimulates vitellogenesis.

  6. Seasonal variations in reproductive activity of the blue crab, Callinectes sapidus: Vitellogenin expression and levels of vitellogenin in the hemolymph during ovarian development.

    Science.gov (United States)

    Thongda, Willawan; Chung, J Sook; Tsutsui, Naoaki; Zmora, Nilli; Katenta, Anna

    2015-01-01

    In general, season affects the physiology and behavior of most animals. Warmer temperatures accelerate growth and reproduction of ectotherms, whereas these processes are slowed or halted in colder temperatures. Female blue crabs, Callinectes sapidus inhabiting the Chesapeake Bay, exhibit a seasonal migratory behavior that is closely tied with spawning and the release of larvae. To better understand reproductive activities of the migratory adult females, we examined two reproductive parameters of these crabs sampled monthly (April-December, 2006): the levels of vitellogenin (VtG) in the hemolymph and VtG expression in the hepatopancreas and ovary. The full-length cDNA of VtG (CasVtG-ova) has been isolated from the ovary. The putative CasVtG sequence found in the ovary is >99% identical to that of the hepatopancreas and is related most closely to the sequences reported in other crab species. In female C. sapidus, the hepatopancreas produces over 99% of the total VtG toward the ovarian development. Ovarian stages 2 and 3 in the sampled females are characterized by significant high levels of VtG in hemolymph and VtG expression in both the hepatopancreas and ovary. However, during the southbound migration in fall, females at ovarian stages 2 and 3 have decreased VtG levels, compared to those in spring and summer. The decreased vitellogenesis activity during the fall migration suggests seasonal adaptation to ensure successful spawning and the larval release. Copyright © 2014 Elsevier Inc. All rights reserved.

  7. mRNA Expression and activity of ion-transporting proteins in gills of the blue crab Callinectes sapidus: effects of waterborne copper.

    Science.gov (United States)

    Martins, Camila M G; Almeida, Daniela Volcan; Marins, Luis Fernando Fernandes; Bianchini, Adalto

    2011-01-01

    Waterborne Cu effects on the transcription of genes encoding ion-transporting proteins and the activities of these proteins were evaluated in gills of the blue crab Callinectes sapidus acclimated to diluted (2‰) and full (30‰) seawater. Crabs were exposed (96 h) to an environmentally relevant concentration of dissolved Cu (0.78 µM) and had their posterior (osmoregulating) gills dissected for enzymatic and molecular analysis. Endpoints analyzed were the activity of key enzymes involved in crab osmoregulation (sodium-potassium adenosine triphosphatase [Na(+)/K(+)-ATPase], hydrogen adenosine triphosphatase [H(+)-ATPase], and carbonic anhydrase [CA]) and the mRNA expression of genes encoding these enzymes and the sodium-potassium-chloride (Na(+)/K(+)/2Cl⁻) cotransporter. Copper effects were observed only in crabs acclimated to diluted seawater (hyperosmoregulating crabs) and were associated with an inhibition of the expression of mRNA of genes encoding the Na(+)/K(+)-ATPase and the Na(+)/K(+)/2Cl⁻ cotransporter. However, Cu did not affect Na(+)/K(+)-ATPase activity, indicating that the gene transcription is downregulated before a significant inhibition of the enzyme activity can be observed. This also suggests the existence of a compensatory response of this enzyme to prevent osmoregulatory disturbances after short-term exposure to environmentally relevant Cu concentrations. These findings suggest that Cu is a potential ionoregulatory toxicant in blue crabs C. sapidus acclimated to low salinity. The lack of Cu effect on blue crabs acclimated to full seawater would be due to the reduced ion uptake needed for the regulation of the hemolymph osmotic concentration in full seawater (30‰). Also, this could be explained considering the lower bioavailability of toxic Cu (free ion) associated with the higher ionic content and dissolved organic matter concentration in high salinity (30‰) than in diluted seawater (2‰). © 2010 SETAC.

  8. Chlorine, temperature, and exposure duration effects of power plant effluents on juvenile blue crabs Callinectes sapidus and grass shrimp Palaemonetes pugio

    Energy Technology Data Exchange (ETDEWEB)

    Hall, L.W. Jr.; Burton, D.T.; Margrey, S.L.

    1979-07-01

    The effects of interacting Cl, temperature, and exposure conditions similar to those found in power plant effluents were assessed for the blue crab Callinectes sapidus and the grass shrimp Palemonetes pugio. Test organisms were exposed to total residual Cl (TRC) concentrations of 0.00, 0.15, and 0.30 mg/l in combination with temperatures 2, 6, and 10/sup 0/C above ambient for 0.08, 2.0, and 4.0 h. The TRC concentrations were decayed over a 1 to 1.5-h period to < 0.01 mg/l. Temperatures were decayed over a 4-h period to 2/sup 0/C above ambient. These conditions were used to simulate Cl and temperature conditions encountered in power plant discharge canals and near-field receiving streams. Regression model techniques were used to establish the interaction of Cl, temperature excess (..delta..T), and exposure duration as factors that caused death up to 36 h after the exposure period. Mortality increased for grass shrimp as the Cl concentration, ..delta..T, and length of exposure increased. A percentage mortality model for grass shrimp shows that (1) the response to Cl concentration alone and ..delta..T alone is proportional to the square root of Cl concentration and ..delta..T, (2) the effect of duration of exposure is linear, and (3) no second-order interactions occurred among the variables tested. No significant mortality was found for blue crabs for any of the variables tested.

  9. Comparative analysis of the proximate and elemental composition of the blue crab Callinectes sapidus, the warty crab Eriphia verrucosa, and the edible crab Cancer pagurus

    Directory of Open Access Journals (Sweden)

    Maurizio Zotti

    2016-02-01

    Full Text Available The proximate composition and element contents of claw muscle tissue of Atlantic blue crabs (Callinectes sapidus were compared with the native warty crab (Eriphia verrucosa and the commercially edible crab (Cancer pagurus. The scope of the analysis was to profile the chemical characteristics and nutritive value of the three crab species. Elemental fingerprints showed significant inter-specific differences, whereas non-significant variations in the moisture and ash contents were observed. In the blue crab, protein content was significantly lower than in the other two species, while its carbon content resulted lower than that characterizing only the warty crab. Among micro-elements, Ba, Cr, Cu, Li, Mn, Ni, and Pb showed extremely low concentrations and negligible among-species differences. Significant inter-specific differences were observed for Na, Sr, V, Ba, Cd and Zn; in particular, cadmium and zinc were characterized in the blue crab by concentrations significantly lower than in the other two species. The analysis of the available literature on the three species indicated a general lack of comparable information on their elemental composition. The need to implement extended elemental fingerprinting techniques for shellfish quality assessment is discussed, in view of other complementary profiling methods such as NMR-based metabolomics.

  10. PCR-based prevalence of a fatal reovirus of the blue crab, Callinectes sapidus (Rathbun) along the northern Atlantic coast of the USA.

    Science.gov (United States)

    Flowers, E M; Simmonds, K; Messick, G A; Sullivan, L; Schott, E J

    2016-06-01

    There is a need for more information on the relationship between diseases and fluctuations of wild populations of marine animals. In the case of Callinectes sapidus reovirus 1 (CsRV1, also known as RLV), there is a lack of baseline information on range, prevalence and outbreaks, from which to develop an understanding of population-level impacts. An RT-qPCR assay was developed that is capable of detecting 10 copies of the CsRV1 genome. In collaboration with state, federal and academic partners, blue crabs were collected from sites throughout the north-eastern United States to assess the northern range of this pathogen. In addition, archived crab samples from the Chesapeake Bay were assessed for CsRV1 by RT-qPCR and histology. PCR-based assessments indicate that CsRV1 was present at all but one site. Prevalence of CsRV1 as assessed by RT-qPCR was highly variable between locations, and CsRV1 prevalence varied between years at a given location. Mean CsRV1 prevalence as assessed by RT-qPCR was >15% each year, and peak prevalence was 79%. The wide geographic range and highly variable prevalence of CsRV1 indicate that more study is needed to understand CsRV1 dynamics and the role the virus plays in blue crab natural mortality. © 2015 The Authors Journal of Fish Diseases Published by John Wiley & Sons Ltd.

  11. Investigation of Petroleum and Wastewater Contaminants in Blue Crab, Callinectes sapidus, Megalopae in the Northern Gulf of Mexico using GC-MS

    Science.gov (United States)

    Chiasson, S. C.; Taylor, C.

    2016-02-01

    We collected blue crab, Callinectes sapidus, megalopae five days per week over a six-month period in 2010 and 2011 at multiple sites across the Northern Gulf of Mexico, and one site in 2013. We used GC-MS to investigate if we could detect evidence of petroleum hydrocarbons in megalopae, and if detected hydrocarbons could be linked to the DWH oil spill. We made a comparison between the distance from the oil slick to our collection sites and the concentration of long straight chain alkanes found in megalopae. We also compared levels of alkanes in megalopae between years. We then scanned the megalopae for presence of other contaminants using GC-MS. We detected long straight chain alkanes in megalopae in 2010 but not in 2011 or 2013. The highest levels of alkanes were found in Grand Isle, suggesting that the alkanes could possibly be sourced from the DWH oil spill. No Polycyclic Aromatic Hydrocarbons (PAHs) were detected, and we found no significant relationship between distance of oil slick to collection sites. Other componds were also detected, of which 4-nonylphenol, butylated hydroxytoluene, 2,4,6-tri-tertbutylphenol, and 2,4-di-tertbutylphenol exceeded the quantification limit.

  12. Stage-specific changes in calcium concentration in crustacean (Callinectes sapidus) Y-organs during a natural molting cycle, and their relation to the hemolymphatic ecdysteroid titer.

    Science.gov (United States)

    Chen, Hsiang-Yin; Dillaman, Richard M; Roer, Robert D; Watson, R Douglas

    2012-09-01

    Secretion of ecdysteroid molting hormones by crustacean Y-organs is suppressed by molt-inhibiting hormone (MIH). The suppressive effect of MIH on ecdysteroidogenesis is mediated by one or more cyclic nucleotide second messengers. In addition, existing data indicate that ecdysteroidogenesis is positively regulated (stimulated) by intracellular Ca(++). Despite the apparent critical role of calcium in regulating ecdysteroidogenesis, the level of Ca(++) in Y-organ cells has not been previously measured during a natural molting cycle for any crustacean species. In studies reported here, a fluorescent calcium indicator (Fluo-4) was used to measure Ca(++) levels in Y-organs during a molting cycle of the blue crab, Callinectes sapidus. Mean calcium fluorescence increased 5.8-fold between intermolt (C4) and stage D3 of premolt, and then dropped abruptly, reaching a level in postmolt (A) that was not significantly different from that in intermolt (P>0.05). The level of ecdysteroids in hemolymph of Y-organ donor crabs (measured by radioimmunoassay) showed an overall pattern similar to that observed for calcium fluorescence, rising from 2.9 ng/mL in intermolt to 357.1 ng/mL in D3 (P<0.05), and then dropping to 55.3 ng/mL in D4 (P<0.05). The combined results are consistent with the hypothesis that ecdysteroidogenesis is stimulated by an increase in intracellular Ca(++). Copyright © 2012 Elsevier Inc. All rights reserved.

  13. Systematic investigation of factors controlling supercritical fluid extraction (SFE) of spiked and aged PCBs from edible tissues of the blue crab (Callinectes sapidus).

    Science.gov (United States)

    Gaylor, Michael O; Harvey, Ellen; Hale, Robert C

    2015-01-01

    Systematic investigation of factors controlling supercritical fluid extraction (SFE) of spiked and naturally incurred (aged) PCBs from edible tissues of the Blue Crab (Callinectes sapidus) was undertaken. Effects of extraction pressure, temperature and time, CO2 flow rate and total volume, and collection temperature were assessed. Temperature dramatically impacted extraction efficiency, especially at lower pressures. Surprisingly, extraction of both spiked and aged PCBs was flow rate dependent, counter to prevailing views regarding the relative ease of SFE of spiked versus aged contaminants from environmental matrices. PCBs were optimally trapped on a 1:1 mixture of C18-modified and porous silica at 0°C and eluted with <2 mL isooctane at 90°C. A combined 10 min static/30 min dynamic extraction at 35.5 MPa and 150°C with a CO2 flow rate of 3 mL min(-1) yielded maximum (quantitative) recoveries of spiked and aged PCBs. Resulting solvent extracts required no cleanup and could be analyzed directly by halogen-selective GC with MS confirmation.

  14. Effects of temperature and salinity on prevalence and intensity of infection of blue crabs, Callinectes sapidus, by Vibrio cholerae, V. parahaemolyticus, and V. vulnificus in Louisiana.

    Science.gov (United States)

    Sullivan, Timothy J; Neigel, Joseph E

    2018-01-01

    Coastal marine and estuarine environments are experiencing higher average temperatures, greater frequency of extreme temperature events, and altered salinities. These changes are expected to stress organisms and increase their susceptibility to infectious diseases. However, beyond these generalities, little is known about how environmental factors influence host-pathogen relationships in the marine realm. We investigated the prevalence and intensity of infections by Vibrio cholerae, V. parahaemolyticus, and V. vulnificus in blue crabs, Callinectes sapidus, from Louisiana saltmarshes in relation to temperature and salinity. We evaluated relationships for single measurements taken at the time of collection and for more complex measurements representing accumulated exposure to physiologically-stressful environmental conditions for up to 31 days prior to collection. We found that: (1) prevalence of infection varied across the Louisiana coast, (2) prevalence of all three Vibrio species was influenced by temperature and salinity, and (3) measurements that represent accumulated exposure to extreme conditions are useful predictors of infection prevalence and can provide insights into underlying biological mechanisms. Copyright © 2017 Elsevier Inc. All rights reserved.

  15. Comparative analysis of the proximate and elemental composition of the blue crab Callinectes sapidus, the warty crab Eriphia verrucosa, and the edible crab Cancer pagurus.

    Science.gov (United States)

    Zotti, Maurizio; Coco, Laura Del; Pascali, Sandra Angelica De; Migoni, Danilo; Vizzini, Salvatrice; Mancinelli, Giorgio; Fanizzi, Francesco Paolo

    2016-02-01

    The proximate composition and element contents of claw muscle tissue of Atlantic blue crabs (Callinectes sapidus) were compared with the native warty crab (Eriphia verrucosa) and the commercially edible crab (Cancer pagurus). The scope of the analysis was to profile the chemical characteristics and nutritive value of the three crab species. Elemental fingerprints showed significant inter-specific differences, whereas non-significant variations in the moisture and ash contents were observed. In the blue crab, protein content was significantly lower than in the other two species, while its carbon content resulted lower than that characterizing only the warty crab. Among micro-elements, Ba, Cr, Cu, Li, Mn, Ni, and Pb showed extremely low concentrations and negligible among-species differences. Significant inter-specific differences were observed for Na, Sr, V, Ba, Cd and Zn; in particular, cadmium and zinc were characterized in the blue crab by concentrations significantly lower than in the other two species. The analysis of the available literature on the three species indicated a general lack of comparable information on their elemental composition. The need to implement extended elemental fingerprinting techniques for shellfish quality assessment is discussed, in view of other complementary profiling methods such as NMR-based metabolomics.

  16. Habitat selection of the pink shrimp Farfantepenaeus paulensis and the blue crab Callinectes sapidus in an estuary in southern Brazil: influence of salinity and submerged seagrass meadows

    Directory of Open Access Journals (Sweden)

    Vinicius Mendes Ruas

    Full Text Available This study was conducted in two estuarine inlets (Saco da Mangueira and Saco do Arraial at the Patos Lagoon estuary, southern Brazil. The changes in relative abundance and size of post-larvae and juvenile shrimp Farfantepenaeus paulensis and juvenile blue crab Callinectes sapidus were compared, considering the influence of salinity and the presence of submerged seagrass meadows. The analyses were performed using generalized linear models (GLM for abundance variations and ANOVA for variations on the size of individuals. The pink shrimp was more abundant at Saco da Mangueira, in seagrass meadows and areas of higher salinity. The blue crab was more abundant at Saco do Arraial and in lower levels of salinity. The importance of submerged vegetation for the blue crab lies in a preference of smaller crabs of the species for the seagrass meadows. It has been shown that these species choose different habitats in the estuary, and both the salinity and the presence of submerged seagrass meadows influence the selection of habitat.

  17. Effects of crude oil and oil/dispersant mixture on growth and expression of vitellogenin and heat shock protein 90 in blue crab, Callinectes sapidus, juveniles.

    Science.gov (United States)

    Chiasson, Susan C; Taylor, Caz M

    2017-06-30

    The 2010 Deepwater Horizon (DWH) oil spill in the northern Gulf of Mexico (NGOM) resulted in over 780million liters of crude oil spilling into Gulf waters. In an effort to disperse the oil, nearly 7.6million liters of dispersant was applied. Many commercially and recreationally important species reside in or near the area of the spill. The blue crab, Callinectes sapidus, is common in the NGOM and is both economically and ecologically important in this region. In this study, after exposing juvenile blue crabs to oil or a mixture of oil and dispersant we tested for relative expression of heat shock protein 90 (hsp90) and vitellogenin (vtg) by measuring their corresponding mRNA expression. We also monitored crabs over two molts to test for effects on growth. Expression of hsp90 was significantly downregulated, and we did not detect any effects of exposure to oil or oil/dispersant mixture on growth or vtg expression. Copyright © 2017 Elsevier Ltd. All rights reserved.

  18. Metal Accumulations in Water, Sediment, Crab (Callinectes sapidus) and Two Fish Species (Mugil cephalus and Anguilla anguilla) from the Köyceğiz Lagoon System-Turkey: An Index Analysis Approach.

    Science.gov (United States)

    Genç, Tuncer Okan; Yilmaz, Fevzi

    2017-08-01

    The concentrations of six metals (Hg, Cd, Cu, Pb, Cr and Zn) individual total metal load (IMBI) values and its relation to condition index were determined in water, sediment and tissues of crab (Callinectes sapidus) and two fish species (Mugil cephalus and Anguilla anguilla) inhabiting Köyceğiz Lagoon System. The average distribution of the IMBI values ranged from 0.033 to 0.265. Distribution patterns of IMBI in species follow the sequence: A. anguilla > M. cephalus > C. sapidus. Results showed that there are positive relationships between species sizes and metal levels in most cases. The concentrations of Pb in muscle in the three studied species were in all cases considerably higher than the maximum levels set by law. Average Cd, Cu and Zn values in M. cephalus were also higher than the limits proposed for fish by FAO/WHO, EC and TFC. Therefore, the human consumption of all analysed species is not recommended.

  19. (1)H NMR metabolomic profiling of the blue crab (Callinectes sapidus) from the Adriatic Sea (SE Italy): A comparison with warty crab (Eriphia verrucosa), and edible crab (Cancer pagurus).

    Science.gov (United States)

    Zotti, Maurizio; De Pascali, Sandra Angelica; Del Coco, Laura; Migoni, Danilo; Carrozzo, Leonardo; Mancinelli, Giorgio; Fanizzi, Francesco Paolo

    2016-04-01

    The metabolomic profile of blue crab (Callinectes sapidus) captured in the Acquatina lagoon (SE Italy) was compared to an autochthonous (Eriphia verrucosa) and to a commercial crab species (Cancer pagurus). Both lipid and aqueous extracts of raw claw muscle were analyzed by (1)H NMR spectroscopy and MVA (multivariate data analysis). Aqueous extracts were characterized by a higher inter-specific discriminating power compared to lipid fractions. Specifically, higher levels of glutamate, alanine and glycine characterized the aqueous extract of C. sapidus, while homarine, lactate, betaine and taurine characterized E. verrucosa and C. pagurus. On the other hand, only the signals of monounsaturated fatty acids distinguished the lipid profiles of the three crab species. These results support the commercial exploitation and the integration of the blue crab in human diet of European countries as an healthy and valuable seafood. Copyright © 2015 Elsevier Ltd. All rights reserved.

  20. Elevated water temperature increases the levels of reo-like virus and selected innate immunity genes in hemocytes and hepatopancreas of adult female blue crab, Callinectes sapidus.

    Science.gov (United States)

    Chung, J Sook; Pitula, J S; Schott, E; Alvarez, J V; Maurer, L; Lycett, K A

    2015-11-01

    Seasonal changes in water temperature directly affect the aquatic ecosystem. The blue crab, Callinectes sapidus, inhabiting the Chesapeake Bay has been adapted to seasonal changes of the environmental conditions. In this, the animals halt their physiological process of the growth and reproduction during colder months while they resume these processes as water temperatures increase. We aimed to understand the effect of the elevated temperatures on a disease progression of reo-like virus (CsRLV) and innate immunity of adult female C. sapidus. Following a rise in water temperature from 10 to 23 °C, CsRLV levels in infected crabs rose significantly in hemocytes and multiple organs. However, in hemocytes, the elevated temperature had no effect on the levels of three innate immune genes: Cas-ecCuZnSOD-2, CasPPO and CasLpR three carbohydrate metabolic genes: CasTPS, CasGlyP; and CasTreh and the total hemocyte counts (THC). Interestingly, the hemocytes of CsRLV infected animals exposed to 23 °C for 10 days had significantly elevated levels of Cas-ecCuZnSOD-2 and CasTPS, compared to those of the uninfected ones also exposed to the same condition and compared to hatchery-raised females kept at 23 °C. Despite the lack of changes in THC, the types of hemocytes from the animals with high CsRLV levels differed from those of uninfected ones and from hatchery animals kept at 23 °C: CsRLV-infected crabs had hemocytes of smaller size with less cytosolic complexity than uninfected crabs. It therefore appears that the change in temperature influences rapid replication of CsRLV in all internal tissues examined. This implies that CsRLV may have broad tissue tropism. Interestingly, the digestive tract (mid- and hindgut) contains significantly higher levels of CsRLV than hemocytes while hepatopancreas and ovary have lower levels than hemocytes. Innate immune responses differ by tissue: midgut and hepatopancreas with upregulated Cas-ecCuZnSOD-2 similar to that found in hemocytes. By

  1. Ecdysone and retinoid-X receptors of the blue crab, Callinectes sapidus: cloning and their expression patterns in eyestalks and Y-organs during the molt cycle.

    Science.gov (United States)

    Techa, Sirinart; Chung, J Sook

    2013-09-15

    Crustacean molting is known to be regulated largely by ecdysteroids and crustacean hyperglycemic hormone (CHH) neuropeptide family including molt-inhibiting hormone (MIH) and CHH. The surge of 20-OH ecdysone and/or ponasterone A initiates the molting process through binding to its conserved heterodimeric nuclear receptor: Ecdysone Receptor (EcR) and Ultraspiracle (USP)/Retinoid-X Receptor (RXR). To better understand the role of ecdysteroids in the molt regulation, the full-length cDNAs of the blue crab, Callinectes sapidus EcR1 and RXR1 were isolated from the Y-organs and their expression levels were determined in both Y-organs and eyestalks at various molt stages. Y-organs show the expression of four putative isoforms of CasEcRs and CasRXRs which differ in the length of the open reading frame but share the same domain structures as in typical nuclear receptors: AF1, DBD, HR, LBD, and AF2. The putative CasEcR isoforms are derived from a 27-aa insert in the HR and a 49-aa residue substitution in the LBD. In contrast, an insertion of a 5-aa and/or a 45-aa in the DBD and LBD gives rise to CasRXR isoforms. The eyestalks and Y-organs show the co-expression of CasEcRs and CasRXRs but at the different levels. In the eyestalks, the expression levels of CasRXRs are 3-5 times higher than those of CasEcRs, while in Y-organs, CasRXRs are 2.5-4 times higher than CasEcRs. A tissue-specific response to the changes in the levels of hemolymphatic ecdysteroids indicates that these tissues may have differences in the sensitivity or responsiveness to ecdysteroids. The presence of upstream open reading frame and internal ribosome entry site in 5' UTR sequences of C. sapidus and other arthropod EcR/RXR/USP analyzed by in silico indicates a plausible, strong control(s) of the translation of these receptors. Copyright © 2013 Elsevier B.V. All rights reserved.

  2. New functions of arthropod bursicon: inducing deposition and thickening of new cuticle and hemocyte granulation in the blue crab, Callinectes sapidus.

    Directory of Open Access Journals (Sweden)

    J Sook Chung

    Full Text Available Arthropod growth requires molt-associated changes in softness and stiffness of the cuticle that protects from desiccation, infection and injury. Cuticle hardening in insects depends on the blood-borne hormone, bursicon (Burs, although it has never been determined in hemolymph. Whilst also having Burs, decapod crustaceans reiterate molting many more times during their longer life span and are encased in a calcified exoskeleton, which after molting undergoes similar initial cuticle hardening processes as in insects. We investigated the role of homologous crustacean Burs in cuticular changes and growth in the blue crab, Callinectes sapidus. We found dramatic increases in size and number of Burs cells during development in paired thoracic ganglion complex (TGC neurons with pericardial organs (POs as neurohemal release sites. A skewed expression of Burs β/Burs α mRNA in TGC corresponds to protein contents of identified Burs β homodimer and Burs heterodimer in POs. In hemolymph, Burs is consistently present at ∼21 pM throughout the molt cycle, showing a peak of ∼89 pM at ecdysis. Since initial cuticle hardness determines the degree of molt-associated somatic increment (MSI, we applied recombinant Burs in vitro to cuticle explants of late premolt or early ecdysis. Burs stimulates cuticle thickening and granulation of hemocytes. These findings demonstrate novel cuticle-associated functions of Burs during molting, while the unambiguous and constant presence of Burs in cells and hemolymph throughout the molt cycle and life stages may implicate further functions of its homo- and heterodimer hormone isoforms in immunoprotective defense systems of arthropods.

  3. New functions of arthropod bursicon: inducing deposition and thickening of new cuticle and hemocyte granulation in the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Chung, J Sook; Katayama, Hidekazu; Dircksen, Heinrich

    2012-01-01

    Arthropod growth requires molt-associated changes in softness and stiffness of the cuticle that protects from desiccation, infection and injury. Cuticle hardening in insects depends on the blood-borne hormone, bursicon (Burs), although it has never been determined in hemolymph. Whilst also having Burs, decapod crustaceans reiterate molting many more times during their longer life span and are encased in a calcified exoskeleton, which after molting undergoes similar initial cuticle hardening processes as in insects. We investigated the role of homologous crustacean Burs in cuticular changes and growth in the blue crab, Callinectes sapidus. We found dramatic increases in size and number of Burs cells during development in paired thoracic ganglion complex (TGC) neurons with pericardial organs (POs) as neurohemal release sites. A skewed expression of Burs β/Burs α mRNA in TGC corresponds to protein contents of identified Burs β homodimer and Burs heterodimer in POs. In hemolymph, Burs is consistently present at ∼21 pM throughout the molt cycle, showing a peak of ∼89 pM at ecdysis. Since initial cuticle hardness determines the degree of molt-associated somatic increment (MSI), we applied recombinant Burs in vitro to cuticle explants of late premolt or early ecdysis. Burs stimulates cuticle thickening and granulation of hemocytes. These findings demonstrate novel cuticle-associated functions of Burs during molting, while the unambiguous and constant presence of Burs in cells and hemolymph throughout the molt cycle and life stages may implicate further functions of its homo- and heterodimer hormone isoforms in immunoprotective defense systems of arthropods.

  4. D1-like dopamine receptors downregulate Na+-K+-ATPase activity and increase cAMP production in the posterior gills of the blue crab Callinectes sapidus.

    Science.gov (United States)

    Arnaldo, Francis B; Villar, Van Anthony M; Konkalmatt, Prasad R; Owens, Shaun A; Asico, Laureano D; Jones, John E; Yang, Jian; Lovett, Donald L; Armando, Ines; Jose, Pedro A; Concepcion, Gisela P

    2014-09-15

    Dopamine-mediated regulation of Na(+)-K(+)-ATPase activity in the posterior gills of some crustaceans has been reported to be involved in osmoregulation. The dopamine receptors of invertebrates are classified into three groups based on their structure and pharmacology: D1- and D2-like receptors and a distinct invertebrate receptor subtype (INDR). We tested the hypothesis that a D1-like receptor is expressed in the blue crab Callinectes sapidus and regulates Na(+)-K(+)-ATPase activity. RT-PCR, using degenerate primers, showed the presence of D1βR mRNA in the posterior gill. The blue crab posterior gills showed positive immunostaining for a dopamine D5 receptor (D5R or D1βR) antibody in the basolateral membrane and cytoplasm. Confocal microscopy showed colocalization of Na(+)-K(+)-ATPase and D1βR in the basolateral membrane. To determine the effect of D1-like receptor stimulation on Na(+)-K(+)-ATPase activity, intact crabs acclimated to low salinity for 6 days were given an intracardiac infusion of the D1-like receptor agonist fenoldopam, with or without the D1-like receptor antagonist SCH23390. Fenoldopam increased cAMP production twofold and decreased Na(+)-K(+)-ATPase activity by 50% in the posterior gills. This effect was blocked by coinfusion with SCH23390, which had no effect on Na(+)-K(+)-ATPase activity by itself. Fenoldopam minimally decreased D1βR protein expression (10%) but did not affect Na(+)-K(+)-ATPase α-subunit protein expression. This study shows the presence of functional D1βR in the posterior gills of euryhaline crabs chronically exposed to low salinity and highlights the evolutionarily conserved function of the dopamine receptors on sodium homeostasis. Copyright © 2014 the American Physiological Society.

  5. Cloning of prophenoloxidase from hemocytes of the blue crab, Callinectes sapidus and its expression and enzyme activity during the molt cycle.

    Science.gov (United States)

    Alvarez, Javier V; Chung, J Sook

    2013-11-01

    The arthropods cuticle undergoes dramatic morphological and biochemical changes from being soft to hardness through each molting process. Prophenoloxidase (PPO) known as a key enzyme in the arthropod innate immune system involved in the melanization reaction, has been related with the initial shell-hardening process, specifically in the sclerotization of the protein matrix in the new cuticle. Since hemocytes have been reported as the main PPO source in arthropods, the transport of hemocyte PPO into the newly laid, soft cuticle has been proposed for shell-hardening occurring during and immediately after ecdysis. In order to define the role of hemocyte PPO in the shell-hardening of crustaceans, the full-length cDNA sequence (2806 nt) of hemocytes PPO of the blue crab Callinectes sapidus (CasPPO-hemo) is isolated using degenerate PCR and 5'-3' RACE. CasPPO-hemo encodes a putative PPO (672 aa) showing three hemocyanin domains: N, M, and C in order and two copper binding sites (CuA & CuB). The sequence analysis identifies the putative CasPPO-hemo as zymogen which requires the cleavage at the N-terminus for its activation. Hemocyte extract (CasHLS) contains the PO, the activity of which depends on the in vitro activation of trypsin. The expression levels of CasPPO-hemo are kept constant during the molt cycle. The increase in the number of hemocytes at early premolt correlates with the elevated PO activity, while at late premolt, the increment in hemocyte numbers does not reflect on the PO activity. The functional importance of the changes in the levels of CasHLS-PO activity during molt cycle is discussed in relation to cuticle hardening process. Copyright © 2013 Elsevier Ltd. All rights reserved.

  6. Feedback From Peripheral Musculature to Central Pattern Generator in the Neurogenic Heart of the Crab Callinectes sapidus: Role of Mechanosensitive Dendrites

    Science.gov (United States)

    García-Crescioni, Keyla; Fort, Timothy J.; Stern, Estee; Brezina, Vladimir

    2010-01-01

    The neurogenic heart of decapod crustaceans is a very simple, self-contained, model central pattern generator (CPG)-effector system. The CPG, the nine-neuron cardiac ganglion (CG), is embedded in the myocardium itself; it generates bursts of spikes that are transmitted by the CG's five motor neurons to the periphery of the system, the myocardium, to produce its contractions. Considerable evidence suggests that a CPG-peripheral loop is completed by a return feedback pathway through which the contractions modify, in turn, the CG motor pattern. One likely pathway is provided by dendrites, presumably mechanosensitive, that the CG neurons project into the adjacent myocardial muscle. Here we have tested the role of this pathway in the heart of the blue crab, Callinectes sapidus. We performed “de-efferentation” experiments in which we cut the motor neuron axons to the myocardium and “de-afferentation” experiments in which we cut or ligated the dendrites. In the isolated CG, these manipulations had no effect on the CG motor pattern. When the CG remained embedded in the myocardium, however, these manipulations, interrupting either the efferent or afferent limb of the CPG-peripheral loop, decreased contraction amplitude, increased the frequency of the CG motor neuron spike bursts, and decreased the number of spikes per burst and burst duration. Finally, passive stretches of the myocardium likewise modulated the spike bursts, an effect that disappeared when the dendrites were cut. We conclude that feedback through the dendrites indeed operates in this system and suggest that it completes a loop through which the system self-regulates its activity. PMID:19828726

  7. Production and characterization of films based on blends of chitosan from blue crab (Callinectes sapidus) waste and pectin from Orange (Citrus sinensis Osbeck) peel.

    Science.gov (United States)

    Baron, Ricardo Duran; Pérez, Latife Lúquez; Salcedo, Jesús Mejía; Córdoba, Luis Pérez; Sobral, Paulo José do Amaral

    2017-05-01

    The objective of this study was to develop and characterize films based on blends of chitosan and pectin, produced in laboratory scale, from industrial wastes. The chitosan was obtained by termoalcaline deacetylation of chitin, extracted from blue crab (Callinectes sapidus) waste and characterized according to degree of deacetylation (DD) and viscosimetric molecular weight (Mw); and pectin was extracted by conventional heating, from orange (Citrus sinensis Osbeck) peel and characterized according to degree of esterification (DE) and molecular weight (Mw). The Ch:P based films were prepared by the casting method in different Ch:P ratios [0: 100, 25:75, 50:50, 75:25 and 100:0], and compared to two controls [0:100 and 100:0], of commercial pectin and chitosan. Glycerol was used as a plasticizer at concentrations of 0.2g/g macromolecules. The addition of high concentrations of pectin in the formulations resulted in films with high solubility and an increase in moisture. No significant difference (P>0.05) in the degree of swelling (DS) and water vapor permeability (WVP) of the films was observed. Ch:P blend films were less stiff and therefore more elastic and flexible than films based on only one biopolymer. The control films presented better results in terms of color, being brighter and less opaque than other film formulations. These data suggest that chitosan or pectin obtained from agro-industrial waste is a potential matrix to produce biodegradable films for future food applications. Copyright © 2017 Elsevier B.V. All rights reserved.

  8. Evaluation of lactic acid bacterium fermentation products and food-grade chemicals to control Listeria monocytogenes in blue crab (Callinectes sapidus) meat.

    Science.gov (United States)

    Degnan, A J; Kaspar, C W; Otwell, W S; Tamplin, M L; Luchansky, J B

    1994-01-01

    Fresh blue crab (Callinectes sapidus) meat was obtained from retail markets in Florida and sampled for viable Listeria monocytogenes. The pathogen was found in crabmeat in three of four different lots tested by enrichment and at levels of 75 CFU/g in one of the same four lots by direct plating. Next, crabmeat was steam sterilized, inoculated with a three-strain mixture of L. monocytogenes (ca. 5.5 log10 CFU/g), washed with various lactic acid bacterium fermentation products (2,000 to 20,000 arbitrary units [AU]/ml of wash) or food-grade chemicals (0.25 to 4 M), and stored at 4 degrees C. Counts of the pathogen remained relatively constant in control samples during storage for 6 days, whereas in crabmeat washed with Perlac 1911 or MicroGard (10,000 to 20,000 AU), numbers initially decreased (0.5 to 1.0 log10 unit/g) but recovered to original levels within 6 days. Numbers of L. monocytogenes cells decreased 1.5 to 2.7 log10 units/g of crabmeat within 0.04 day when washed with 10,000 to 20,000 AU of Alta 2341, enterocin 1083, or Nisin per ml. Thereafter, counts increased 0.5 to 1.6 log10 units within 6 days. After washing with food-grade chemicals, modest reductions (0.4 to 0.8 log10 unit/g) were observed with sodium acetate (4 M), sodium diacetate (0.5 or 1 M), sodium lactate (1 M), or sodium nitrite (1.5 M). However, Listeria counts in crabmeat washed with 2 M sodium diacetate decreased 2.6 log10 units/g within 6 days. In addition, trisodium phosphate reduced L. monocytogenes counts from 1.7 (0.25 M) to > 4.6 (1 M) log10 units/g within 6 days.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:7944362

  9. The influence of temperature and salinity on mortality of recently recruited blue crabs, Callinectes sapidus, naturally infected with Hematodinium perezi (Dinoflagellata).

    Science.gov (United States)

    Huchin-Mian, Juan Pablo; Small, Hamish J; Shields, Jeffrey D

    2018-02-01

    The parasitic dinoflagellate Hematodinium perezi is highly prevalent in juvenile blue crabs, Callinectes sapidus, along the eastern seaboard of the USA. Although the parasite is known to kill adult crabs, the mortality rate of naturally infected juvenile crabs remains unknown. We analyzed the influence of temperature and salinity on the mortality of recently recruited blue crabs that were naturally infected with H. perezi. Over 492 juvenile crabs (infected, n = 282; uninfected controls, n = 210) were held individually in six-well plates and held at six temperatures (4, 10, 15, 20, 25, and 30 °C) or three salinities (5, 15, and 30 psu) for a maximum of 90 days. Mortality of infected crabs was 10 times higher at elevated temperatures (25 and 30 °C) and salinity (30 psu) compared to uninfected control treatments. By contrast, infected crabs exposed to mild temperatures (10, 15, and 20 °C) showed a high survival (>80%), no different than uninfected control treatments. Infected crabs at the lowest temperature (4 °C) exhibited a high mortality, but the intensity of infection was lower than in the other temperature treatments. In addition, this study revealed the optimal temperature (25 °C) and salinity (30 psu) for H. perezi to progress in its life cycle leading to sporulation in juvenile crabs; 31.6% (19/60) of crabs held under these conditions released dinospores of H. perezi after 10 days. Crabs held at other temperatures did not release dinospores over the time course of the experiment. Infected crabs were capable of molting and in most cases molted at the same frequency as uninfected crabs serving as controls. The mortality observed in this study indicates that early benthic juveniles will experience significant mortality due to H. perezi with increasing ocean temperatures and that this mortality may be a significant factor in the recruitment of blue crabs to high salinity regions. Copyright © 2018. Published by Elsevier Inc.

  10. Discovery and characterization of the Crustacean hyperglycemic hormone precursor related peptides (CPRP) and orcokinin neuropeptides in the sinus glands of the blue crab Callinectes sapidus using multiple tandem mass spectrometry techniques.

    Science.gov (United States)

    Hui, Limei; Cunningham, Robert; Zhang, Zichuan; Cao, Weifeng; Jia, Chenxi; Li, Lingjun

    2011-09-02

    The crustacean sinus gland (SG) is a well-defined neuroendocrine site that produces numerous hemolymph-borne agents including the most complex class of endocrine signaling molecules-neuropeptides. Via a multifaceted mass spectrometry (MS) approach, 70 neuropeptides were identified including orcokinins, orcomyotropin, crustacean hyperglycemic hormone (CHH) precursor-related peptides (CPRPs), red pigment concentrating hormone (RPCH), pigment dispersing hormone (PDH), proctolin, RFamides, RYamides, and HL/IGSL/IYRamide. Among them, 15 novel orcokinins, 9 novel CPRPs, 1 novel orcomyotropin, 1 novel Ork/Orcomyotropin-related peptide, and 1 novel PDH were de novo sequenced via collision induced dissociation (CID) from the SG of a model organism Callinectes sapidus. Electron transfer dissociation (ETD) was used for sequencing of intact CPRPs due to their large size and higher charge state. Capillary isoelectric focusing (CIEF) was employed for separation of members of the orcokinin family, which is one of the most abundant neuropeptide families observed in the SG. Collectively, our study represents the most complete characterization of neuropeptides in the SG and provides a foundation for future investigation of the physiological function of neuropeptides in the SG of C. sapidus.

  11. Acute toxicity, accumulation and tissue distribution of copper in the blue crab Callinectes sapidus acclimated to different salinities: In vivo and in vitro studies

    Energy Technology Data Exchange (ETDEWEB)

    De Martinez Gaspar Martins, Camila [Programa de Pos-Graduacao em Ciencias Fisiologicas - Fisiologia Animal Comparada, Instituto de Ciencias Biologicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Italia km 8, 96201-900, Rio Grande, RS (Brazil); Barcarolli, Indianara Fernanda; Menezes, Eliana Jaime de; Mussoi Giacomin, Marina [Instituto de Ciencias Biologicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Italia km 8, 96201-900, Rio Grande, RS (Brazil); Wood, Chris M. [McMaster University, Department of Biology, 1280 Main Street West, Hamilton, ON, L8S 4K1 (Canada); Bianchini, Adalto, E-mail: adaltobianchini@furg.br [Programa de Pos-Graduacao em Ciencias Fisiologicas - Fisiologia Animal Comparada, Instituto de Ciencias Biologicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Italia km 8, 96201-900, Rio Grande, RS (Brazil); Instituto de Ciencias Biologicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Av. Italia km 8, 96201-900, Rio Grande, RS (Brazil)

    2011-01-17

    In vivo and in vitro studies were performed to evaluate acute toxicity, organ-specific distribution, and tissue accumulation of copper in Callinectes sapidus acclimated to two different experimental salinities (2 and 30 ppt). Blue crabs were quite tolerant to copper. Acute dissolved copper toxicity (96-h LC{sub 50} and its corresponding 95% confident interval) was higher at salinity 2 ppt (5.3 (3.50-8.05) {mu}M Cu) than at 30 ppt (53.0 (27.39-102.52) {mu}M Cu). The difference between salinities can be completely explained based on the water chemistry because it disappeared when 96-h LC{sub 50} values were expressed as the free Cu{sup 2+} ion (3.1 (1.93-4.95) {mu}M free Cu at 2 ppt versus 5.6 (2.33-13.37) {mu}M free Cu at 30 ppt) or the Cu{sup 2+} activity (1.4 (0.88-2.26) {mu}M Cu activity at 2 ppt versus 1.7 (0.71-4.07) {mu}M Cu activity at 30 ppt). The relationships between gill Cu burden and % mortality were very similar at 2 and 30 ppt, in accord with the Biotic Ligand Model. In vivo experiments showed that copper concentration in the hemolymph is not dependent on metal concentration in the surrounding medium at either experimental salinity. They also showed that copper flux into the gills is higher than into other tissues analyzed, and that anterior and posterior gills are similarly important sites of copper accumulation at both experimental salinities. In vitro experiments with isolated-perfused gills showed that there is a positive relationship between copper accumulation in this tissue and the metal concentration in the incubation media for both anterior and posterior gills. A similar result was observed at both low and high salinities. Furthermore, in vitro experiments showed that copper accumulation in posterior gills is also positively and strongly dependent on the incubation time with copper. Gill copper accumulation occurred at a lower rate in the first 2 h of metal exposure, increasing markedly after this 'steady-state' period. This finding

  12. Acute toxicity, accumulation and tissue distribution of copper in the blue crab Callinectes sapidus acclimated to different salinities: in vivo and in vitro studies.

    Science.gov (United States)

    Martins, Camila De Martinez Gaspar; Barcarolli, Indianara Fernanda; de Menezes, Eliana Jaime; Giacomin, Marina Mussoi; Wood, Chris M; Bianchini, Adalto

    2011-01-17

    In vivo and in vitro studies were performed to evaluate acute toxicity, organ-specific distribution, and tissue accumulation of copper in Callinectes sapidus acclimated to two different experimental salinities (2 and 30 ppt). Blue crabs were quite tolerant to copper. Acute dissolved copper toxicity (96-h LC(50) and its corresponding 95% confident interval) was higher at salinity 2 ppt (5.3 (3.50-8.05) μM Cu) than at 30 ppt (53.0 (27.39-102.52) μM Cu). The difference between salinities can be completely explained based on the water chemistry because it disappeared when 96-h LC(50) values were expressed as the free Cu(2+) ion (3.1 (1.93-4.95) μM free Cu at 2 ppt versus 5.6 (2.33-13.37) μM free Cu at 30 ppt) or the Cu(2+) activity (1.4 (0.88-2.26) μM Cu activity at 2 ppt versus 1.7 (0.71-4.07) μM Cu activity at 30 ppt). The relationships between gill Cu burden and % mortality were very similar at 2 and 30 ppt, in accord with the Biotic Ligand Model. In vivo experiments showed that copper concentration in the hemolymph is not dependent on metal concentration in the surrounding medium at either experimental salinity. They also showed that copper flux into the gills is higher than into other tissues analyzed, and that anterior and posterior gills are similarly important sites of copper accumulation at both experimental salinities. In vitro experiments with isolated-perfused gills showed that there is a positive relationship between copper accumulation in this tissue and the metal concentration in the incubation media for both anterior and posterior gills. A similar result was observed at both low and high salinities. Furthermore, in vitro experiments showed that copper accumulation in posterior gills is also positively and strongly dependent on the incubation time with copper. Gill copper accumulation occurred at a lower rate in the first 2h of metal exposure, increasing markedly after this "steady-state" period. This finding was corroborated by a significant

  13. Dieta natural do siri-azul Callinectes sapidus (Decapoda, Portunidae na região estuarina da Lagoa dos Patos, Rio Grande, Rio Grande do Sul, Brasil Natural diet of the blue crab Callinectes sapidus (Decapoda, Portunidae in the Patos Lagoon estuary area, Rio Grande, Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Alexandre Oliveir

    Full Text Available Na região estuarina da Lagoa dos Patos, o siri-azul Callinectes sapidus Rathbun, 1869 é o mais abundante dentre as espécies do gênero. Apesar do siri-azul exercer influência sobre as comunidades bentônicas, por ser considerado um predador do topo da cadeia alimentar, não existem muitos estudos sobre aspectos ecológicos, inclusive sobre a composição e variabilidade sazonal de sua dieta natural, neste estuário. O objetivo principal deste estudo foi investigar a composição da dieta do siri-azul, evidenciando possíveis relações com a comunidade bentônica da região estuarina da Lagoa dos Patos. O período de estudo foi de março de 2003 a março de 2004, com coletas bimestrais. Os organismos foram coletados com auxílio de rede de arrasto de fundo, com malha de 13 mm entre nós opostos. Ainda em campo os animais foram fixados em formol 10%. Após a coleta os animais foram separados quanto ao sexo, medidos (largura e comprimento da carapaça - cm e pesados (peso - g. Após a triagem, os animais foram dissecados e os intestinos retirados e pesados. As análises dos conteúdos alimentares dos siris demonstraram que os hábitos alimentares são diversificados, constituindo-se principalmente de invertebrados bentônicos. O item encontrado com maior freqüência foi Detrito, seguido pelo molusco filtrador Erodona mactroides Bosc, 1802 (Erodonidae. Crustáceos da classe Ostracoda e grãos de areia foram importantes componentes dos conteúdos dos intestinos anteriores, sendo que areia não foi considerada como item alimentar, propriamente dito. Também foram encontradas cerdas e mandíbulas de poliquetos, além de sementes das macrófitas Ruppia maritima L. (Potamogatonaceae e Zannichellia palustris L. (Potamogatonaceae. Este estudo serve como subsídio para medidas de proteção e conservação da população do siri-azul, bem como caracteriza relações tróficas com comunidades bentônicas do estuário da Lagoa dos Patos.The Southern

  14. Comparação do crescimento entre Callinectes sapidus (Crustacea, Decapoda, Portunidae coletados em campo e mantidos em condições contoladas Growth comparison between Callinectes sapidus (Crustacea, Decapoda, Portunidae collected on the field and maintained under controlled conditions

    Directory of Open Access Journals (Sweden)

    Marcos A. Rodrigues

    2008-09-01

    Full Text Available Devido à falta de estruturas rígidas para determinação de idade em crustáceos, métodos que se baseiam na determinação de idade através da distribuição da freqüência de comprimentos são comumente utilizados. Neste trabalho, foi comparado o crescimento do siri-azul, Callinectes sapidus Rathbun, 1896, em laboratório e a partir de indivíduos de campo. Os indivíduos de laboratório, após a coleta, tiveram seu crescimento acompanhado individualmente. A temperatura foi mantida constante (25±2°C e a salinidade a 20±5. Os indivíduos do campo foram coletados entre 2002 e 2004 em pontos pré-determinados no estuário da Laguna dos Patos, com rede de portas. A biometria, nos dois casos, constou da medida da largura da carapaça (LC mm. As estimativas das curvas de crescimento, segundo o modelo de Bertalanffy para os indivíduos de campo, foram obtidas pelo acompanhamento do deslocamento modal (MPA. O tamanho máximo de largura de carapaça utilizado foi mantido fixo em todas as análises (157,78 mm para fêmeas e 162,71 mm para machos. Para os indivíduos mantidos em laboratório, os parâmetros e a longevidade obtidos foram k=0,001/dia; t o=-1,53; longevidade de 3117 dias (8,5 anos para machos e k=0,002/dia; t o=-29,5; longevidade de 2795 dias para fêmeas (7,7 anos. Os parâmetros de crescimento e a longevidade estimados para os animais coletados em campo foram k=0,004/dia; t o=-4,23; 1267 dias (3,5 anos para machos e k=0,004/dia; t o=-3,71; 1260 dias (3,45 anos para fêmeas. Foram encontradas diferenças significativas entre animais de laboratório e de campo, sugerindo que a espécie responde de forma diferente ao ambiente em que está inserida.The absence of hard structures which register age on crustaceans requires the use of length-based methods for age determination, and modal progression analysis (MPA to estimate growth. In this paper, individual growth of the blue crab Callinectes sapidus Rathbun, 1896 was studied in the

  15. Molecular cloning of a putative crustacean hyperglycemic hormone (CHH) isoform from extra-eyestalk tissue of the blue crab (Callinectes sapidus), and determination of temporal and spatial patterns of CHH gene expression.

    Science.gov (United States)

    Zheng, Junying; Chen, Hsiang-Yin; Choi, Cheol Young; Roer, Robert D; Watson, R Douglas

    2010-11-01

    Crustacean hyperglycemic hormone (CHH) is a polypeptide neurohormone involved in regulation of multiple physiological processes. We report here the cloning from thoracic ganglia of the blue crab (Callinectes sapidus) a cDNA (CsCHH-2) encoding a putative CHH isoform (CsCHH-2). CsCHH-2 is structurally similar to a putative preproCHH (CsCHH-1) previously cloned from eyestalk ganglia of C. sapidus. The two preprohormones possess an identical signal peptide and CHH precursor related peptide, but differ in the mature CHH polypeptide. An analysis by RT-PCR of the tissue distribution of CsCHH-1 and CsCHH-2 revealed the former is restricted to eyestalk neural ganglia, while the latter is widely distributed among tissues. The type of CHH transcript present in eyestalk and thoracic ganglia did not vary as a function of the molt cycle. An assessment of transcript abundance in tissues of intermolt crabs showed the abundance of the CsCHH-1 transcript in eyestalk ganglia far exceeds the abundance of the CsCHH-2 transcript in extra-eyestalk tissue. An assessment of transcript abundance during a molt cycle showed CsCHH-1 transcript abundance in eyestalk ganglia was low during intermolt, rose during premolt, reaching a peak in D(3), then fell prior to molting, and remained low during postmolt. By contrast, CsCHH-2 transcript abundance in thoracic ganglia was low during intermolt, rose sharply during D(2), then dropped in D(3) and remained low during postmolt. The results are consistent with the hypothesis that CsCHH-1 and CsCHH-2 differ with respect to physiological function. Copyright © 2010 Elsevier Inc. All rights reserved.

  16. A novel putative lipoprotein receptor (CasLpR) in the hemocytes of the blue crab, Callinectes sapidus: cloning and up-regulated expression after the injection of LPS and LTA.

    Science.gov (United States)

    Tsutsui, Naoaki; Chung, J Sook

    2012-03-01

    The full-length cDNA encoding a putative lipoprotein receptor (CasLpR) was isolated from the hemocytes of Callinectes sapidus using 5' and 3' RACEs. The open reading frame for CasLpR contains a precursor of putative CasLpR consisting of 1710 amino acid residues including 22 amino acid residues of the signal peptide (22 amino acids). Mature CasLpR (1688 amino acids with 5.6% of phosphorylation sites) has multiple, putative functional domains: five low-density lipoprotein receptor domains in the N-terminus, and a G-protein-coupled receptor proteolysis site domain and a 7 transmembrane receptor (secretin family) domain in the C-terminus. To date, there are no proteins with a similar domain structure in the GenBank. The expression pattern of CasLpR was exclusive in hemocytes among all tested tissues obtained from a juvenile female at intermolt stage: brain, eyestalk ganglia, pericardial organs, and thoracic ganglia complex (nervous system); hepatopancreas (digestive system); heart, artery and hemocytes (circulatory system); gill and antennal gland (excretory system), hypodermis; and Y-organ (endocrine organ). There was no CasLpR expression in the ovary of an adult female. A putative function of CasLpR was examined after challenges of lipopolysaccharides (LPS) and lipoteichoic acid (LTA) in vivo using qRT-PCR assays. Animals at 24 h after injection of LPS or LTA up-regulated the expression of CasLpR in hemocytes by ∼3.5 and 1.4 folds, respectively, compared to the controls that received saline injection. LPS challenge also caused the greatest increment (∼55 folds) of heat shock protein 90 (Hsp90) expression in these samples. These data indicate that putative CasLpR and CasHsp90 may be involved in the defense system or the stress response of C. sapidus. Copyright © 2011 Elsevier Ltd. All rights reserved.

  17. The presence of an insulin-like androgenic gland factor (IAG) and insulin-like peptide binding protein (ILPBP) in the ovary of the blue crab, Callinectes sapidus and their roles in ovarian development.

    Science.gov (United States)

    Huang, Xiaoshuai; Ye, Haihui; Chung, J Sook

    2017-08-01

    Insulin-like androgenic gland factor (IAG) that is produced by the male androgenic gland (AG), plays a role in sexual differentiation and maintenance of male secondary sex characteristics in decapod crustaceans. With an earlier finding of IAG expression in a female Callinectes sapidus ovary, we aimed to examine a putative role of IAG during the ovarian development of this species. To this end, the full-length cDNA sequence of the ovarian CasIAG (termed CasIAG-ova) has been isolated. The predicted mature peptide sequence of CasIAG-ova is identical to that of the IAG from the AG, except in their signal peptide regions. The CasIAG-ova contains an alternative initiation codon (UUG) as the start codon, which suggests that the translational regulation of CasIAG-ova may differ from that of the IAG from AG. To define the function of CasIAG-ova, the expressions of CasIAG-ova as well as its putative binding protein, insulin-like peptide binding protein (ILPBP), are measured in the ovaries at various developmental stages obtained from different seasons. Season affects both CasIAG and ILPBP expression in the ovary. Overall, summer females at earlier ovarian stages contain high levels of CasIAG and ILPBP than spring or fall females. These findings indicate that CasIAG-ova and CasILPBP may be involved in the ovarian development. When comparing the levels of CasIAG and CasILPBP in the ovary, the latter are much higher (∼10-10000 fold) than the former. Expression patterns of CasILPBP differ from those of CasIAG-ova during ovarian development and by season, suggesting that ILPBP may have an additional role in ovarian development rather than a function of a putative binding protein of IAG. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Modelagem de ocorrência e densidade de juvenis de Callinectes sapidus (Decapoda, Portunidae em dois estuários do Rio Grande do Sul, com dados zero-inflacionados

    Directory of Open Access Journals (Sweden)

    Ana Carolina Braga Martins

    2014-06-01

    Full Text Available Dados de contagem de juvenis de siri-azul (Callinectes sapidus Rathbun, 1896 coletados em dois estuários do Rio Grande do Sul são objeto do presente estudo. Por se encontrarem zero-inflacionados, esses dados motivaram a formulação de modelos hierárquicos, que quantificam o efeito das covariáveis categóricas mês e local sobre a probabilidade de ocorrência e densidade dessas populações, levando em conta a detecção imperfeita. Foram também desenvolvidos modelos não-hierárquicos para comparação. Uma abordagem Bayesiana foi adotada para a estimação dos parâmetros dos modelos por simulação Monte Carlo com Cadeias de Markov (MCMC. A comparação entre modelos foi feita com o Critério de Informação da Deviância (DIC. Os modelos hierárquicos apresentaram ajustes melhores que os modelos convencionais, mitigaram o problema do excesso de zeros e permitiram analisar simultaneamente as probabilidades de ocorrência e a densidade de juvenis de siri-azul. No estuário da Lagoa dos Patos, a probabilidade de ocorrência de juvenis na Classe 2 aumenta com a distância da desembocadura, enquanto em Tramandaí os pontos intermediários apresentam as maiores probabilidades. Em ambos os estuários a ocorrência é mais provável nos meses de verão e de inverno. A densidade de juvenis da Classe 2 apresenta marcada variação em relação aos meses do ano sendo, em geral, maior no estuário de Tramandaí.

  19. Molecular cloning of a plasma membrane Ca²⁺ ATPase (PMCA) from Y-organs of the blue crab (Callinectes sapidus), and determination of spatial and temporal patterns of PMCA gene expression.

    Science.gov (United States)

    Chen, Hsiang-Yin; Roer, Robert D; Watson, R Douglas

    2013-06-10

    Existing data indicate that a stage-specific increase in intracellular free Ca(2+) stimulates ecdysteroid production by crustacean molting glands (Y-organs). The concentration of Ca(2+) in cytosol is controlled mainly by proteins intrinsic to the plasma membrane and to the membranes of organelles. Several families of proteins are involved, including Ca(2+) channels, Ca(2+) pumps (ATPases), and Ca(2+) exchangers. The family of Ca(2+) pumps includes plasma membrane calcium ATPases (PMCAs). As a step toward understanding the involvement of calcium signaling in regulation of ecdysteroidogenesis, we used a PCR-based cloning strategy (RT-PCR followed by 3'- and 5'-RACE) to clone from Y-organs of the blue crab (Callinectes sapidus) a cDNA encoding a putative PMCA. The 4292 base pair (bp) cDNA includes a 3510 bp open reading frame encoding a 1170-residue protein (Cas-PMCA). The conceptually translated protein has a relative molecular mass of 128.8×10(3) and contains all signature domains of an authentic PMCA, including ten transmembrane domains and a calmodulin binding site. The predicted membrane topography of Cas-PMCA is as expected for an authentic PMCA protein. A phylogenetic analysis of nonredundant amino acid sequences of PMCA proteins from different species showed Cas-PMCA clusters with other arthropod PMCA proteins. An assessment of tissue distribution showed the Cas-PMCA transcript to be broadly distributed in both neural and non-neural tissues. Studies using quantitative real-time PCR revealed stage-specific changes in Cas-PMCA abundance during the molting cycle, with peak expression occurring during premolt stage D2, a pattern consistent with the hypothesis that Cas-PMCA functions to maintain cellular Ca(2+) homeostasis in Y-organs. Copyright © 2013 Elsevier B.V. All rights reserved.

  20. The smell of moulting: N-acetylglucosamino-1,5-lactone is a premoult biomarker and candidate component of the courtship pheromone in the urine of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Kamio, Michiya; Schmidt, Manfred; Germann, Markus W; Kubanek, Julia; Derby, Charles D

    2014-04-15

    Female blue crabs (Callinectes sapidus) in their pubertal moult stage release unidentified sex pheromone molecules in their urine, causing males to respond with courtship behaviours including a display called courtship stationary paddling and a form of precopulatory guarding called cradle carry. We hypothesized that pheromones are mixtures of molecules and are more concentrated in urine of pubertal premoult females compared with other moulting stages and thus that these molecules are biomarkers (i.e. metabolites that can be used as an indicator of some biological state or condition) of pubertal premoult females. We tested this hypothesis by combining bioassay-guided fractionation and biomarker targeting. To evaluate the molecular mass of the putative pheromone by bioassay-guided fractionation, we separated urine from pubertal premoult females and intermoult males by ultrafiltration into three molecular mass fractions. The 1000 Da fraction of female urine induced male courtship stationary paddling, but none of the fractions of male urine did. Thus, female urine contains molecules of <1000 Da that stimulate courtship behaviours in males. Biomarker targeting using nuclear magnetic resonance (NMR) spectral analysis of the 500-1000 Da fraction of urine from premoult and postmoult males and females revealed a premoult biomarker. Purification, nuclear magnetic resonance, mass spectrometry and high pressure liquid chromatography analysis of this premoult biomarker identified it as N-acetylglucosamino-1,5-lactone (NAGL) and showed that it is more abundant in urine of premoult females and males than in urine of either postmoult or juvenile females and males. NAGL has not been reported before as a natural product or as a molecule of the chitin metabolic pathway. Physiological and behavioural experiments demonstrated that blue crabs can detect NAGL through their olfactory pathway. Thus, we hypothesize that NAGL is a component of the sex pheromone and that it acts in

  1. Gene transcripts encoding hypoxia-inducible factor (HIF) exhibit tissue- and muscle fiber type-dependent responses to hypoxia and hypercapnic hypoxia in the Atlantic blue crab, Callinectes sapidus.

    Science.gov (United States)

    Hardy, Kristin M; Follett, Chandler R; Burnett, Louis E; Lema, Sean C

    2012-09-01

    Hypoxia inducible factor (HIF) is a transcription factor that under low environmental oxygen regulates the expression of suites of genes involved in metabolism, angiogenesis, erythropoiesis, immune function, and growth. Here, we isolated and sequenced partial cDNAs encoding hif-α and arnt/hif-β from the Atlantic blue crab, Callinectes sapidus, an estuarine species that frequently encounters concurrent hypoxia (low O(2)) and hypercapnia (elevated CO(2)). We then examined the effects of acute exposure (1h) to hypoxia (H) and hypercapnic hypoxia (HH) on relative transcript abundance for hif-α and arnt/hif-β in different tissues (glycolytic muscle, oxidative muscle, hepatopancreas, gill, and gonads) using quantitative real-time RT-PCR. Our results indicate that hif-α and arnt/hif-β mRNAs were constitutively present under well-aerated normoxia (N) conditions in all tissues examined. Further, H and HH exposure resulted in both tissue-specific and muscle fiber type-specific effects on relative hif-α transcript abundance. In the gill and glycolytic muscle, relative hif-α mRNA levels were significantly lower under H and HH, compared to N, while no change (or a slight increase) was detected in oxidative muscle, hepatopancreas and gonadal tissues. H and HH did not affect relative transcript abundance for arnt/hif-β in any tissue or muscle fiber type. Thus, in crustaceans the HIF response to H and HH appears to involve changes in hif transcript abundance, with variation in hif-α and arnt/hif-β transcriptional dynamics occurring in both a tissue- and muscle fiber type-dependent manner. Copyright © 2012 Elsevier Inc. All rights reserved.

  2. Molt-inhibiting hormone stimulates vitellogenesis at advanced ovarian developmental stages in the female blue crab, Callinectes sapidus 2: novel specific binding sites in hepatopancreas and cAMP as a second messenger

    Science.gov (United States)

    Zmora, Nilli; Sagi, Amir; Zohar, Yonathan; Chung, J Sook

    2009-01-01

    The finding that molt-inhibiting hormone (MIH) regulates vitellogenesis in the hepatopancreas of mature Callinectes sapidus females, raised the need for the characterization of its mode of action. Using classical radioligand binding assays, we located specific, saturable, and non-cooperative binding sites for MIH in the Y-organs of juveniles (J-YO) and in the hepatopancreas of vitellogenic adult females. MIH binding to the hepatopancreas membranes had an affinity 77 times lower than that of juvenile YO membranes (KD values: 3.22 × 10-8 and 4.19 × 10-10 M/mg protein, respectively). The number of maximum binding sites (BMAX) was approximately two times higher in the hepatopancreas than in the YO (BMAX values: 9.24 × 10-9 and 4.8 × 10-9 M/mg protein, respectively). Furthermore, MIH binding site number in the hepatopancreas was dependent on ovarian stage and was twice as high at stage 3 than at stages 2 and 1. SDS-PAGE separation of [125I] MIH or [125I] crustacean hyperglycemic hormone (CHH) crosslinked to the specific binding sites in the membranes of the J-YO and hepatopancreas suggests a molecular weight of ~51 kDa for a MIH receptor in both tissues and a molecular weight of ~61 kDa for a CHH receptor in the hepatopancreas. The use of an in vitro incubation of hepatopancreas fragments suggests that MIH probably utilizes cAMP as a second messenger in this tissue, as cAMP levels increased in response to MIH. Additionally, 8-Bromo-cAMP mimicked the effects of MIH on vitellogenin (VtG) mRNA and heterogeneous nuclear (hn) VtG RNA levels. The results imply that the functions of MIH in the regulation of molt and vitellogenesis are mediated through tissue specific receptors with different kinetics and signal transduction. MIH ability to regulate vitellogenesis is associated with the appearance of MIH specific membrane binding sites in the hepatopancreas upon pubertal/final molt. PMID:19583849

  3. Biodiversidad, morfometría y alimentación de los cangrejos del género Callinectes (Decapoda: Portunidae en Santiago de Cuba

    Directory of Open Access Journals (Sweden)

    Liliana Gómez Luna

    2009-09-01

    Full Text Available El objetivo del presente trabajo es el estudio del género Callinectes en la zona costera del municipio de Santiago de Cuba. Se realizó una recolecta de 257 ejemplares durante marzo de 2007 a abril de 2008, en ocho estaciones a lo largo de la costa. El género resultó estar ampliamente distribuido en el litoral y representado al menos por cuatro especies: C. sapidus, C. similis, C. rathbunae y C. larvatus, las dos últimas no incluidas en la lista publicada de crustáceos (Crustacea: Decapoda cubanos. Las especies más abundantes resultaron ser C. sapidus y C. similis. C. rathbunae fue la más ampliamente distribuida. El análisis del contenido estomacal permitió identificar nueve categorías alimentarias, siendo las más importantes los peces y las macroalgas. Las especies de Callinectes tienen un amplio espectro trófico; comen no sólo lo disponible, sino también lo más abundante.Biodiversity, morphometry and diet of Callinectes crabs (Decapoda: Portunidae in Santiago de Cuba. On the basis of fishery intensity and proximity to river mouth, a total of 257 swimming Callinectes crabs were collected from March 2007 to April 2008 in eight localities. Captures were made with hanging nets, to a maximal depth of 1.5m, establishing a top time of 2 hr. The genus was widely distributed, and it is represented at least by four species: C. sapidus, C. similis, C. rathbunae and C. larvatus, the last two not included in the last list of Cuban crustaceans (Crustacea: Decapoda. The size and shape of the gonopods were very useful as taxonomical criteria, considering the prevalence of males. The most abundant species were C. sapidus (47.08%, and C. similis (30.35%. C. rathbunae, which was identified at 75% (6 of the localities, showed a better distribution, followed by C. sapidus, which appears in the 63% (5. Sex rate (Rs by species (male:female was 6.20 for C. rathbunae, 3.58 for C. similis, 1.40 for C. larvatus and 0.40 for C. sapidus. The most abundant

  4. Larval development of Callinectes similis reared in the laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Bookhout, C.G.; Costlow, J.D. Jr.

    1977-10-01

    Freshly hatched larvae of Callinectes similis Williams, the lesser blue crab, were reared to the first crab stage. Eight zoeal stages and one megalopa stage are described with particular reference to types of setae on appendages. Updated information on the development of the commercial blue crab, Callinectes sapidus Rathbun, is also given, as well as similarities and differences between C. similis and C. sapidus. The zoeae of C. similis and C. sapidus are so similar that they can only be separated by a number of minor differences. The dorsal spine of C. similis is significantly longer than that of C. sapidus in all zoeal stages. Other structures, such as the rostrum and antennae, are either longer in early zoeal stages of C. sapidus than in C. similis, or the structures of the two species are not significantly different. In later stages, however, structures measured were generally significantly longer in C. similis than in C. sapidus. Also in later zoeal stages, there are generally small differences in setation of appendages. There are diagnostic differences in lengths of parts of the claw of the first leg and setation of pleopods of the megalopa of the two species. There are also minor differences in the setae of the scaphognathite, in seta of the epipodite of the 3rd maxilliped and in aesthetascs of antennules of the two species.

  5. The trophic position of the Atlantic blue crab Callinectes sapidus Rathbun 1896 in the food web of Parila Lagoon (South Eastern Adriatic, Croatia: a first assessment using stable isotopes.

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    G. MANCINELLI

    2016-09-01

    Here, carbon and nitrogen isotopic signatures were measured in C. sapidus and other representative taxa of the benthic flora and fauna sampled in summer in the Parila Lagoon, a coastal basin located in the Neretva River estuary area (Croatia. d15N values of individual blue crab specimens were used to calculate their trophic position (TP , using the filter feeder mussel Mytilus galloprovincialis as the isotopic baseline. In general, the isotopic signature of C. sapidus was comparable with those characterizing invertebrate and fish predators (e.g., Hexaplex trunculus, Gobius niger. An average  trophic position of 3.73 was estimated for the blue crab population. However, a considerable inter-individual variation was observed in TP values, significantly related with the size of the specimens. Interestingly, a hump-shaped quadratic polynomial resulted the best fitting model for the data, characterized for small-size individuals by a positive body size-TP relationship, leveling or even turning negative for larger adult crabs. The interplay between environmental factors and ontogenetic diet shifts in determining the trophic position of the blue crab and, ultimately, its ecological impact on the benthic community of the Parila Lagoon is discussed.

  6. İskenderun Körfezi'nde Dağılım Gösteren Kum Yengeci [Portunus pelagicus (Linneaus, 1758] ve Mavi Yengeç (Callinectes sapidus Rathbun, 1896 Populasyonları ve Morfometrisi Üzerinde Araştırmalar.

    Directory of Open Access Journals (Sweden)

    Tahir Özcan

    2015-12-01

    Full Text Available Bu çalışma ile İskenderun Körfezi’nden Temmuz 2002- Haziran 2003 tarihleri arsında elde edilen örnekler incelenerek Atlantik kökenli mavi yengeç ( Callinectes sapidus Rathbun, 1896 ve İndo-Pasifik kökenli kum yengeci (Portunus pelagicus Linneaus, 1758’nin boy dağılımları, erkek-dişi oranları belirlenmiştir. Toplam 467 birey (139 adet mavi yengeç ve 328 adet kum yengeci incelenmiştir. İskenderun Körfezi’ndeki kum yengeci populasyonunda %58 ile erkeklerin baskın olduğu, dişi bireylerin ortalama uzun karapas genişlikleri 119,9±2,8 mm genişliğinde, erkek bireylerin ortalama 104,9±2,1 mm uzun karapas genişliğinde oldukları belirlenmiştir. Mavi yengeç populasyonunda ise yaklaşık olarak populasyonun %69’unu dişi bireylerin oluşturduğu ve ortalama uzun karapas genişliği 148,9±2,5 mm, %31’ini oluşturan erkek bireylerin ise ortalama 123,3±3,4 mm uzun karapas genişliğinde oldukları belirlenmiştir

  7. Morphology of the first zoeal stages of five species of the portunid genus Callinectes (Decapoda, Brachyura) hatched at the laboratory.

    Science.gov (United States)

    Mantelatto, Fernando L; Reigada, Alvaro L D; Gatti, Aline C R; Cuesta, José A

    2014-05-23

    The genus Callinectes Stimpson, 1860 currently consists of 16 species, six of which are reported in Brazilian coast. In the present study, the first zoeal stages of Callinectes bocourti, C. danae, C. exasperatus, C. ornatus and C. sapidus from Brazil were obtained from ovigerous females. The morphological and meristic characters of all these larval stages are described and illustrated. Those of C. bocourti, C. danae and C. sapidus are redescribed and compared with the previous descriptions, and differences are listed. Larval characters of these species were examined for interspecific differences, as well as larval features to distinguish the genus Callinectes within Portunidae. In addition, other portunid genera and species with a known first zoeal stage are compared, with special attention to those species present in the same geographical area. Our findings concord with some previous molecular studies, and we discuss the complexity within the group.

  8. Morphology of the first zoeal stages of five species of the portunid genus Callinectes (Decapoda, Brachyura hatched at the laboratory

    Directory of Open Access Journals (Sweden)

    FERNANDO L. MANTELATTO

    2014-06-01

    Full Text Available The genus Callinectes Stimpson, 1860 currently consists of 16 species, six of which are reported in Brazilian coast. In the present study, the first zoeal stages of Callinectes bocourti,C. danae, C. exasperatus, C. ornatus and C. sapidus from Brazil were obtained from ovigerous females. The morphological and meristic characters of all these larval stages are described and illustrated. Those of C. bocourti, C. danae and C. sapidus are redescribed and compared with the previous descriptions, and differences are listed. Larval characters of these species were examined for interspecific differences, as well as larval features to distinguish the genus Callinectes within Portunidae. In addition, other portunid genera and species with a known first zoeal stage are compared, with special attention to those species present in the same geographical area. Our findings concord with some previous molecular studies, and we discuss the complexity within the group.

  9. Crecimiento del cangrejo Callinectes danae (Decapoda: Portunidae de la Isla de Margarita, Venezuela

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    Jesylén Castillo

    2011-12-01

    Full Text Available Las especies del género Callinectes sostienen pesquerías importantes en varias partes del mundo. En el occidente de Venezuela, Callinectes sapidus es capturado con palangre y sostiene una pesquería artesanal importante en el Lago de Maracaibo; mientras que en la Isla de Margarita, Callinectes danae es capturado con nasa en zonas cercanas a lagunas costeras y su pesca está limitada por la oferta y la demanda. Estos recursos son de considerable importancia económica entre los crustáceos comestibles; sin embargo, pocos estudios han sido reportados sobre la dinámica poblacional y potencialidad pesquera en ambientes costeros de Venezuela que contribuyan a la toma de decisiones en la administración pesquera. En este documento se presenta información de los parámetros de crecimiento del cangrejo Callinectes danae Smith, 1869, con el fin de obtener un conocimiento detallado del patrón de crecimiento y lograr estimaciones más precisas sobre el tamaño de la población y su disponibilidad para la explotación. Se analizó una muestra constituida por 3 623 ejemplares capturados con nasa cangrejera por la flota artesanal, entre octubre 2007 y septiembre 2008. Se estableció la relación longitud-peso y se estimaron los parámetros de crecimiento de las curvas en longitud y peso del modelo de von Bertalanffy. La proporción sexual global mostró que no existe diferencia significativa entre machos y hembras (χ2=0.04, p>0.05. Los valores de las pendientes b entre machos y hembras presentaron diferencias significativas (ts=2.75, pDana Swimming crab growth Callinectes danae (Decapoda: Portunidae from Margarita Island, Venezuela. Callinectes danae is a common species captured with crab traps in nearby areas of coastal lagoons in Margarita Island. Although its considerable economic importance as a fishery resource, few studies have been done on population dynamics and its fishery potential in local coastal environments to support decision making in

  10. Cumulative Effects of Coastal Habitat Alterations on Fishery Resources: toward Prediction at Regional Scales

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    Stephen J. Jordan

    2009-06-01

    Full Text Available Coastal habitat alterations such as the loss of submersed aquatic vegetation (SAV and hardening of shorelines could have cumulative effects on valuable fishery resources. To investigate this effect, we developed a multiscale modeling framework for blue crab (Callinectes sapidus in the northern Gulf of Mexico. Areal coverage of shoreline land cover and SAV for Mobile Bay, Alabama, were combined with information from small-scale biological studies and long-term, large-scale commercial fishery data to model the potential effects of marginal habitat losses on the blue crab fishery. We applied stochastic variation in annual recruitment to the fishery to estimate probabilities for sustainable harvests under scenarios of habitat loss. The simulations suggested that, accumulated over large areas, relatively small local losses of estuarine marsh edge and SAV habitats could have long-term negative effects on the sustainability of the fishery. Spatially extensive models are required to investigate the cumulative ecological effects of many local environmental changes. The requisite scaling adds uncertainty and reduces precision, but if model parameters are accurate at each scale, accurate predictions of long-term outcomes and probabilities are possible.

  11. Use of blue crab (Callinectes sapidus) embryos for toxicity testing

    Energy Technology Data Exchange (ETDEWEB)

    Lee, R.; O`Malley, K. [Skidaway Inst. of Oceanography, Savannah, GA (United States)

    1995-12-31

    After fertilization, blue crab embryos develop in egg sacs attached to the female pleopods, often referred to as the sponge. Lipovitellin and lipid droplets in the egg sacs provide energy and nutrition for the developing embryos. Embryos were removed from the sponge and transferred to 24 well culture plates containing sea water with or without toxicants, Each well contained 10 embryos. After 7 to 10 days, embryos hatched to swimming zoea. The effects of toxicants at various concentrations on hatching were determined and the EC{sub 50} calculated. For example, the EC{sub 50} for tributyltin, fenvalerate and mercuric chloride were 50, 30 and 90 ng/liter, respectively. The hatching success of control embryos ranged from 95 to 98%. Formation of the heart, eyespot formation, appendage formation and utilization rate of lipovitellin were also effected by exposure to toxicants. At a low concentration of mercuric ion (30ng/liter) the heart formed, but there was no heart beat. Eyespot formation was abnormal in the presence of high concentrations of cadmium (2 {micro}g/liter) and zinc (5 {micro}g/liter), Crab embryos offer many advantages for toxicity testing of pure compounds or mixtures in water, including toxicity testing of sediment pore water. The crab embryos may also serve as models to understand the effect of specific toxicants on the heart and eye spots of crustaceans.

  12. The bioeconomic impact of different management regulations on the Chesapeake Bay blue crab fishery

    Science.gov (United States)

    Bunnell, David B.; Lipton, Douglas W.; Miller, Thomas J.

    2010-01-01

    The harvest of blue crabs Callinectes sapidus in Chesapeake Bay declined 46% between 1993 and 2001 and remained low through 2008. Because the total market value of this fishery has declined by an average of US $ 3.3 million per year since 1993, the commercial fishery has been challenged to maintain profitability. We developed a bioeconomic simulation model of the Chesapeake Bay blue crab fishery to aid managers in determining which regulations will maximize revenues while ensuring a sustainable harvest. We compared 15 different management scenarios, including those implemented by Maryland and Virginia between 2007 and 2009, that sought to reduce female crab harvest and nine others that used seasonal closures, different size regulations, or the elimination of fishing for specific market categories. Six scenarios produced the highest revenues: the 2008 and 2009 Maryland regulations, spring and fall closures for female blue crabs, and 152- and 165-mm maximum size limits for females. Our most important finding was that for each state the 2008 and 2009 scenarios that implemented early closures of the female crab fishery produced higher revenues than the 2007 scenario, in which no early female closures were implemented. We conclude that the use of maximum size limits for female crabs would not be feasible despite their potentially high revenue, given the likelihood that the soft-shell and peeler fisheries cannot be expanded beyond their current capacity and the potentially high mortality rate for culled individuals that are the incorrect size. Our model results support the current use of seasonal closures for females, which permit relatively high exploitation of males and soft-shell and peeler blue crabs (which have high prices) while keeping the female crab harvest sustainable. Further, our bioeconomic model allows for the inclusion of an economic viewpoint along with biological data when target reference points are set by managers.

  13. Investigação dos teores de metais pesados em espécies de siris azuis do gênero Callinectes sp. Heavy metals content investigation in blue crab species of the genus Callinectes sp.

    Directory of Open Access Journals (Sweden)

    Rossana Helena Pitta Virga

    2008-12-01

    Full Text Available A ocorrência de metais pesados em sistemas aquáticos, usualmente, é resultante de processos naturais geoquímicos. Entretanto, a presença destes elementos químicos tem aumentado consideravelmente nas últimas décadas, como no caso da bacia do rio Cubatão, em conseqüência das atividades humanas na região. Neste trabalho, foi realizada uma análise quantitativa do conteúdo de Pb, Cd, Cr, Zn e Cu, em quatro espécies de siris azuis do gênero Callinectes sp., coletadas ao longo do rio Cubatão, utilizando a técnica da espectrometria de absorção atômica por chama (FAAS. Foram analisadas 144 amostras de siris azuis das seguintes espécies: C. danae (63%; C. sapidus (23%; C. bocourti (10.5%; e C. ornatus (3.5%. A espécie C. Sapidus foi a que apresentou os maiores níveis de concentração para os metais estudados. Com exceção do Cu, cuja concentração média obtida foi 40% maior para as fêmeas (p Usually, heavy metals occurrence in aquatic systems is resulting from natural geochemical processes. However, the presence of these chemical elements has considerably increased in the last decades . An example is the case of the Cubatão river basin caused by human activities in that region. In this work, a quantitative analysis of Pb, Cd, Cr, Zn, and Cu content of four blue crab species of the genus Callinectes sp., sampled along the Cubatão river, was carried out using a flame atomic absorption spectrometer (FAAS. 144 blue crab samples from the following species were analyzed: C. danae (63%, C. sapidus (23%, C. bocourti (10.5%, and C. ornatus (3.5%. The C. Sapidus species presented the highest concentration levels for the studied metals. With the exception of Cu, for which the average concentration was 40% higher for the females (p < 0,05, there was no significant variation in the heavy metal content regarding sex and the size of the animals. Except for Cr, for which the average values interval obtained for the 4 species was above the

  14. A technology analysis of the U.S. Atlantic blue crab (Callinectes sapidus) processing industry

    OpenAIRE

    Hong, Gi-Pyo

    1990-01-01

    The dehydration rates of crabs during low temperature storage and various cooking processes were determined. Season, cooking time, and cooking method significantly affected the weight loss of crabs. The thermal energy (F250 ) crabs received during a commercial cooking process was evaluated by season, cooking method and time, and crab type. The effects of sex, size, and type (sexual maturity) of crab and season on the yields of lump, top flake, bottom flake, and claw...

  15. Oesophageal chemoreceptors of blue crabs, Callinectes sapidus, sense chemical deterrents and can block ingestion of food.

    Science.gov (United States)

    Aggio, Juan F; Tieu, Ryan; Wei, Amy; Derby, Charles D

    2012-05-15

    Decapod crustaceans such as blue crabs possess a variety of chemoreceptors that control different stages of the feeding process. All these chemoreceptors are putative targets for feeding deterrents that cause animals to avoid or reject otherwise palatable food. As a first step towards characterizing the chemoreceptors that mediate the effect of deterrents, we used a behavioral approach to investigate their precise location. Data presented here demonstrate that chemoreceptors located on the antennules, pereiopods and mouthparts do not mediate the food-rejection effects of a variety of deterrents, both natural and artificial to crabs. Crabs always searched for deterrent-laced food and took it to their oral region. The deterrent effect was manifested as either rejection or extensive manipulation, but in both cases crabs bit the food. The biting behavior is relevant because the introduction of food into the oral cavity ensured that the deterrents gained access to the oesophageal taste receptors, and so we conclude that they are the ones mediating rejection. Additional support comes from the fact that a variety of deterrent compounds evoked oesophageal dilatation, which is mediated by oesophageal receptors and has been linked to food rejection. Further, there is a positive correlation between a compound's ability to elicit rejection and its ability to evoke oesophageal dilatation. The fact that deterrents do not act at a distance is in accordance with the limited solubility of most known feeding deterrents, and likely influences predator-prey interactions and their outcome: prey organisms will be attacked and bitten before deterrents become relevant.

  16. The effect of salinity on experimental infections of a Hematodinium sp. in blue crabs, Callinectes sapidus.

    Science.gov (United States)

    Coffey, Anna H; Li, Caiwen; Shields, Jeffrey D

    2012-06-01

    The parasitic dinoflagellate Hematodinium sp. parasitizes blue crabs along the Atlantic seaboard of the United States. Infections in blue crabs have only been reported from waters where salinity is >11 practical salinity units (psu). Blue crabs maintain a hyperosmotic internal concentration at low salinities (0-5 psu), roughly comparable to 24 psu, and should be capable of maintaining an infection in low-salinity waters even if Hematodinium spp. cells are intolerant of low salinities. We tested this notion by observing the effect of low salinity on the progression of disease in crabs experimentally infected with the parasite. Blue crabs were acclimated to 5 psu or 30 psu salinity treatments. They were inoculated with Hematodinium sp. and necropsied 3, 7, 10, and 15 days post-inoculation. The low-salinity treatment did not have an effect on the proliferation of Hematodinium sp. infections in blue crabs; moreover, a greater proportion of infections in crabs in the low-salinity treatment developed dinospore stages than did those in the high-salinity treatment, indicating that salinity may affect the development of the parasite. However, dinospores from in vitro cultures rapidly became inactive when held in salinities <15 psu. Our experiments indicate that Hematodinium spp. can develop in blue crabs at low salinities, but that the parasite is incapable of transmission in this environment, which explains the lack of natural infections in crabs at low salinities.

  17. POP levels in blue crab (Callinectes sapidus) and edible fish from the eastern Mediterranean coast.

    Science.gov (United States)

    Tekin, Serkan; Pazi, Idil

    2017-01-01

    Organochlorinated pesticides and Aroclors were measured in the muscle of two edible fish species (gray mullet, sea bream) and blue crab, collected from eastern Mediterranean coast in 2013. The concentration of organochlorinated pesticides (OCPs) and Aroclors in biota samples which were collected at six sites ranged from 1.0-8.6 and 9-47.5 ng g -1 wet weight, respectively. Total DDT concentrations in seafood samples were compared to tolerance level established by the US Food and Drug Administration (FDA); the concentrations were detected below the tolerence level. Health risk assessment was conducted related to the consumption of chemically contaminated seafood. The estimated daily intake of OCPs calculated by using the estimated daily fish consumption in Turkey was far below the acceptable daily intake as established by FAO/WHO. Our data indicated that consumption of blue crab, gray mullet, and sea bream collected from the Mediterranean coast of Turkey could pose "no risk" for human health in terms of OCPs.

  18. Impacts of the Deepwater Horizon oil spill on blue crab, Callinectes sapidus, larval settlement in Mississippi

    Science.gov (United States)

    The largest accidental release of crude oil in history occurred in the north-central Gulf of Mexico (GOM) between April 20 and July 15, 2010 (Alford et al., this volume). The DWH spill was unprecedented due to both its magnitude (>600,000 metric tons released) and its occurren...

  19. Changes in ecdysteroids during embryogenesis of the blue crab, callinectes sapidus rathbun

    Energy Technology Data Exchange (ETDEWEB)

    McCarthy, J.F.; Skinner, D.M.

    1979-01-01

    Total ecdysteroid titers (estimated by radioimmunoassay (RIA)) in embryos of the blue crab increased from approx. 6 ng 20-hydroxyecdysone equivalents/g in the immature embryo to a maximum of approx. 500 ng 20-hydroxyecdysone equivalents/g in maturing embryos; titers dropped to approx. 300 ng 20-hydroxyecydsone equivalents/g in prehatch embryos. High-pressure reverse-phase chromatography of the embryo extracts resolved five RIA-active components, ..cap alpha..-Ecdysone and the polar conjugate of 20-hydroxyecdysone were present in low quantities. The concentration of 20-hydroxyecdysone increased during embryogenesis to a maximum of approx. 160 ng/g in maturing embryos and decreased only slightly in the prehatch embryos. Two unidentified components were also detected and the changes in their concentrations were estimated. One, an apolar component (peak III), accounted for as much as 63% of the total RIA activity as the embryos matured. The estimated concentration of this component increased from 85 ng/g in early embryos to 475 ng/g in maturing embryos, then decreased by 50% in the prehatch embryos. The level of the other, more polar component (peak II) increased from 7.5 to 75 ng/g as the embryos developed. The increase in the concentration of ecdysteroids during embryogenesis indicates that crab embryos have the capacity to synthesize ecdysteroids and suggests that these hormones may have a physiological role in the embryonic development of crustaceans.

  20. Ultrastructure, Histochemistry, and Mineralization Patterns in the Ecdysial Suture of the Blue Crab, Callinectes sapidus

    Science.gov (United States)

    Priester, Carolina; Dillaman, Richard M.; Gay, D. Mark

    2005-12-01

    The ecdysial suture is the region of the arthropod exoskeleton that splits to allow the animal to emerge during ecdysis. We examined the morphology and composition of the intermolt and premolt suture of the blue crab using light microscopy and scanning electron microscopy. The suture could not be identified by routine histological techniques; however 3 of 22 fluorescein isothiocyanate-labeled lectins tested (Lens culinaris agglutinin, Vicia faba agglutinin, and Pisum sativum agglutinin) differentiated the suture, binding more intensely to the suture exocuticle and less intensely to the suture endocuticle. Back-scattered electron (BSE) and secondary electron observations of fracture surfaces of intermolt cuticle showed less mineralized regions in the wedge-shaped suture as did BSE analysis of premolt and intermolt resin-embedded cuticle. The prism regions of the suture exocuticle were not calcified. X-ray microanalysis of both the endocuticle and exocuticle demonstrated that the suture was less calcified than the surrounding cuticle with significantly lower magnesium and phosphorus concentrations, potentially making its mineral more soluble. The presence or absence of a glycoprotein in the organic matrix, the extent and composition of the mineral deposited, and the thickness of the cuticle all likely contribute to the suture being removed by molting fluid, thereby ensuring successful ecdysis.

  1. Seasonal Shift of Bycatch in the Artisanal Shrimp Trawl Fishery of the Gulf of Salamanca, Caribbean Sea of Colombia

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    Luis Orlando Duarte

    2013-06-01

    Full Text Available Bycatch assessments in trawl fisheries have been mainly referred to an annual scale, ignoring possible seasonal variations. In the Gulf of Salamanca, an artisanal shrimp trawl fleet operates recently and this study evaluates its bycatch for first time, considering the climatic and oceanographic seasonality that dominates the region (runoff and upwelling. 90 hauls in the calm or rainy season (November 2010 and 86 in the windy season (April 2011 were sampled on board of fishing boats. The bycatch to shrimp ratio was 2,69 (2,37 -3,21, 95 % CI and 6,37 (5,10 – 8,24, 95 % CI for the calm season and windy season respectively. We recorded a total of 101 taxa, with a large number of juveniles. The community structure of bycatch differed between seasons (ANOSIM, pStellifer spp., Symphurus caribbeanus y Callinectes sapidus, whereas, in addition, the calm season was characterized by Cathorops mapale, Anchovia clupeoides, Trichiurus lepturus, and the windy season by Larimus breviceps, Cnidaria (jellyfish, Cetengraulis edentulus (Simper. The results showed a seasonal change in the bycatch, raising the need to implement monitoring programs and management measures that address that temporal variability. Negative ecological effects of this fishery prompt the use of mitigation strategies, involving fishermen, to balance social needs and the ecosystem conservation. CAMBIO ESTACIONAL EN LA FAUNA ACOMPAÑANTE DE LA PESQUERÍA ARTESANAL DE ARRASTRE DE CAMARÓN DEL GOLFO DE SALAMANCA, MAR CARIBE DE COLOMBIALa evaluación de la fauna acompañante en las pesquerías de arrastre se ha referido generalmente a una escala anual, ignorando eventuales variaciones estacionales. En el golfo de Salamanca, recientemente opera una flota artesanal de arrastre de camarón, cuya fauna acompañante es evaluada por primera vez en el presente estudio, considerando la estacionalidad climática y oceanográfica que domina la región (descargas continentales y surgencia

  2. Heavy metal bioaccumulation in Callinectes amnicola and ...

    African Journals Online (AJOL)

    ... generated by anthropogenic and natural activities which has become a tremendous concern in developing nations. The levels of cadmium, copper, chromium, lead, zinc and nickel in the tissue of Callinectes amnicola and Farfantepenaeus notialis collected from Igbese River, Makoko and Lekki Lagoon were evaluated for ...

  3. Crecimiento del cangrejo Callinectes danae (Decapoda: Portunidae de la Isla de Margarita, Venezuela

    Directory of Open Access Journals (Sweden)

    Jesylén Castillo

    2011-12-01

    Full Text Available Las especies del género Callinectes sostienen pesquerías importantes en varias partes del mundo. En el occidente de Venezuela, Callinectes sapidus es capturado con palangre y sostiene una pesquería artesanal importante en el Lago de Maracaibo; mientras que en la Isla de Margarita, Callinectes danae es capturado con nasa en zonas cercanas a lagunas costeras y su pesca está limitada por la oferta y la demanda. Estos recursos son de considerable importancia económica entre los crustáceos comestibles; sin embargo, pocos estudios han sido reportados sobre la dinámica poblacional y potencialidad pesquera en ambientes costeros de Venezuela que contribuyan a la toma de decisiones en la administración pesquera. En este documento se presenta información de los parámetros de crecimiento del cangrejo Callinectes danae Smith, 1869, con el fin de obtener un conocimiento detallado del patrón de crecimiento y lograr estimaciones más precisas sobre el tamaño de la población y su disponibilidad para la explotación. Se analizó una muestra constituida por 3 623 ejemplares capturados con nasa cangrejera por la flota artesanal, entre octubre 2007 y septiembre 2008. Se estableció la relación longitud-peso y se estimaron los parámetros de crecimiento de las curvas en longitud y peso del modelo de von Bertalanffy. La proporción sexual global mostró que no existe diferencia significativa entre machos y hembras (χ2=0.04, p>0.05. Los valores de las pendientes b entre machos y hembras presentaron diferencias significativas (ts=2.75, p<0.05 igualmente los interceptos a (ts=2.44, p<0.05; por lo que se estableció la relación longitud-peso por separado: P=7.48e-5*L2.98 para machos y P=1.21e-4*L2.87 para hembras, evidenciándose un crecimiento alométrico negativo en ambos sexos. Los parámetros de crecimiento quedaron establecidos en: L∞=134.80mm, P∞=166.04g y k=0.86/año para machos; L∞=122.35mm, P∞=118.45g y k=0.63/año para hembras. La

  4. On the taxonomy and distribution of Callinectes Stimpson (Crustacea, Decapoda, Portunidae in Rio Grande do Norte

    Directory of Open Access Journals (Sweden)

    C. Sankarankutty

    1991-01-01

    Full Text Available A faunistic survey of the species of Callinectes Stimpson, 1871 carried out in the coastal and estuarine regions of the State of Rio Grande do Norte yielded five species: C. bocourti A. Milne Edwards, 1879; C. danae Smith, 1869; C. exasperatus (Gerstaecker, 1856; C. larvatus Ordway, 1863 and C. ornatus Ordway, 1863. Specimens examined consist of those collected on a monthly basis from three fixed stations within the estuary of Potengi, Natal during a period of two years and those obtained from other localities. Among the species occuring in the region, C. danae is more abundant and has a wider range of tolerance of salinity while C. larvatus is restricted to the marine habitat. Though C. danae sustains important artisan fishery, C. bocourti of large size also contribute to the fishery.

  5. [Dana swimming crab growth Callinectes danae (Decapoda: Portunidae) from Margarita Island, Venezuela].

    Science.gov (United States)

    Castillo, Jesylén; Eslava, Nora; González, Leo Walter

    2011-12-01

    Callinectes danae is a common species captured with crab traps in nearby areas of coastal lagoons in Margarita Island. Although its considerable economic importance as a fishery resource, few studies have been done on population dynamics and its fishery potential in local coastal environments to support decision making in fishery administration. We present growth pattern details of Callinectes danae to better estimate its population size and exploitation feasibility. For this, we analyzed a total of 3 623 specimens that were monthly captured in crab pots by artisanal fishermen in Las Marites lagoon, from October 2007 to September 2008. The length-weight ratio was determined, and growth parameters estimated from both length and weight curves of the von Bertalanffy model. The general sex ratio showed no significant difference between males and females (chi2 = 0.04, p > 0.05). However, values of slopes b between males and females were significantly different (t(s) = 2.75, p < 0.05), as well as intercepts a (t(s) = 2.44, p < 0.05). Thus, the length-weight ratio was determined separately: W = 7.48e(-5)*L(2.98) for males and W = 1.21e(-4)*L(2.87) for females, indicating a negative allometric growth in both sexes. Growth parameters were established as: L(infinity) =134.80mm, W(infinity) = 166.04g and k = 0.86/yr for males; L(infinity) = 122.35mm, W(infinity) = 118.45g and k = 0.63/yr for females. Lifespan was estimated at 3.05 years for males and 4.24 years for females. We concluded that Callinectes danae is a species with short lifespan and moderately rapid growth. The coefficient of variation values (CV), of the phi-prime growth performance index (Ø'), showed a different growth pattern compared to those obtained in other regions. We propose that a management strategy will be the periodical review of the minimum capture size for fishing area, after the great variability found in growth parameters.

  6. Lagenidium callinectes INFECTION ON ROTIFERS Brachionus sp.

    Directory of Open Access Journals (Sweden)

    Des Roza

    2007-06-01

    Full Text Available Milkfish, Chanos chanos and humpback grouper, Cromileptes altivelis hatcheries have developed at Gondol, Bali since 1995 and until now still rely on rotifers, the main natural food, supply. Recent problem on mass culture of rotifer, Brachionus sp. is harvest failure caused by fungus infection. Under light microscope, infected eggs and bodies of the rotifers was filled with numerous aseptate hyphae. Two isolates of fungi were isolated from rotifer eggs and carcass on June 21st, 2004 and on June 25th, 2004 obtained from milkfish and humpback grouper hatcheries at Gondol. Based on its morphological characteristics, the pathogenic fungus was identified as Lagenidium callinectes which grows optimally at 25°C and survives in 1.0%, 2.5%, and 5.0% NaCl as well as in 1.0% and 2.5% KCl. Both of the present isolates utilize only 8 out of 26 carbohydrates and derivatives tested as carbon, nutrition and energy sources. This finding is the first report on rotifer, Brachionus sp. infected with L. callinectes causing up to 100% mortality.

  7. Structure, molting, and mineralization of the dorsal ossicle complex in the gastric mill of the blue crab, Callinectes sapidus.

    Science.gov (United States)

    Vatcher, Hayley E; Roer, Robert D; Dillaman, Richard M

    2015-11-01

    This study examined the mesocardiac and urocardiac ossicles in the gastric mill of the blue crab to describe its structure, mineralization, and dynamics throughout the molt cycle, and to assess its possible utility in age determination. Morphologically, the mineralized ossicles are similar to the calcified dorsal carapace having a lamellate structure comprised of sheets of chitin/protein fibrils. Staining with acridine orange showed the same arrangement of an epicuticle, exocuticle, and endocuticle. In much of the mesocardiac and urocardiac ossicles, the endocuticle is very reduced, with the exocuticle predominating; the reverse of the dimensions of the exoskeleton. The lamellate structure of the ossicles was confirmed with scanning electron microscopy; however, elemental mapping by energy-dispersive analysis of X-rays revealed that the ossicles are mineralized with calcium phosphate, in contrast to the calcium carbonate biomineral of the exoskeleton. The medial tooth of the urocardiac ossicle is not calcified, but the epicuticle is highly elaborated and impregnated with silica. Histological examination of the ossicles demonstrated that they are molted during ecdysis, so despite the appearance of bands in the mesocardiac ossicle, it is difficult to hypothesize how the bands could represent a record of chronological age. © 2015 Wiley Periodicals, Inc.

  8. Climate Change Effects on Respiration Rates of Blue Crab (Callinectes sapidus) from the Patuxent River, Chesapeake Bay

    Science.gov (United States)

    Nyffeler, A.

    2016-02-01

    A rise in atmospheric CO2 induces a greenhouse effect that also causes ocean temperatures and CO2 levels to rise. These environmental changes may represent an additional energetic cost for blue crabs because they rely on the concentration of CO2 in the water to deposit calcium carbonate in their shells. We conducted a respiration experiment to measure the effect of climate change on crab metabolism. Crabs were collected from the Chesapeake Bay and exposed to different heated and acidified conditions. After crabs had been exposed to the environmental conditions in the chambers for two molts, they were placed in respiration chambers to measure rates of oxygen consumption. Results indicated different trends in respiration rates between the treatments, although the patterns were not statistically significant. Crabs exposed to higher temperatures showed elevated respiration rates, while crabs exposed to high CO2 demonstrated decreased respiration rates. The two factors of climate change (high temperature and high CO2) did not demonstrate the highest respiration rate, but rather the crabs exposed to high temperatures and ambient CO2 showed the highest mean respiration rate. These data suggest that crab metabolism may not change as much as expected due to climate changes.

  9. Bioaccumulation and depuration of metals in blue crabs (Callinectes sapidus Rathbun) from a contaminated and clean estuary

    Energy Technology Data Exchange (ETDEWEB)

    Reichmuth, Jessica M., E-mail: jreichmuth02@gmail.co [Department of Biological Sciences, Rutgers, State University of New Jersey, 195 University Avenue, Newark, NJ 07102 (United States); Weis, Peddrick, E-mail: weis@umdnj.ed [Department of Radiology, UMDNJ-Medical School of New Jersey, Newark, NJ 07101 (United States); Weis, Judith S., E-mail: jweis@andromeda.rutgers.ed [Department of Biological Sciences, Rutgers, State University of New Jersey, 195 University Avenue, Newark, NJ 07102 (United States)

    2010-02-15

    Blue crabs from a contaminated estuary (Hackensack Meadowlands-HM) and a cleaner reference site (Tuckerton-TK) were analyzed for Cr, Cu, Hg, Pb, and Zn in muscle and hepatopancreas. Crabs from each site were taken into the laboratory and fed food from the other site, or in another experiment, transplanted to the other site for eight weeks. All crabs were analyzed for metals. Overall, tissue concentrations reflected environmental conditions. Tissue differences were found for Cu, Pb and Zn (all higher in hepatopancreas), and Hg (higher in muscle). HM muscle had more Hg than TK muscle, but did not decrease after transplanting or consuming clean food. HM crabs lost Cu, Pb and Zn in hepatopancreas after being fed clean food or transplanted. TK crabs increased Hg in muscle and Cr and Zn in hepatopancreas after transplantation or being fed contaminated (HM) food. Concentrations were variable, suggesting that blue crabs may not be fully reliable bioindicators of polluted systems. - The accumulation of metals within the muscle and hepatopancreas of blue crabs was highly variable, but often followed environmental concentrations.

  10. Experimental infections of Orchitophrya stellarum (Scuticociliata) in American blue crabs (Callinectes sapidus) and fiddler crabs (Uca minax).

    Science.gov (United States)

    Miller, Terrence L; Small, Hamish J; Peemoeller, Bhae-Jin; Gibbs, David A; Shields, Jeffrey D

    2013-11-01

    Outbreaks of an unidentified ciliate have occurred on several occasions in blue crabs from Chesapeake Bay held during winter months in flow-through systems. The parasite was initially thought to be Mesanophrys chesapeakensis, but molecular analysis identified it as Orchitophyra stellarum, a facultative parasite of sea stars (Asteroidea). We investigated the host-parasite association of O. stellarum in the blue crab host. Crabs were inoculated with the ciliate, or they were held in bath exposures after experimentally induced autotomy of limbs in order to determine potential mechanisms for infection. Crabs inoculated with the ciliate, or exposed to it after experimental autotomy, rapidly developed fatal infections. Crabs that were not experimentally injured, but were exposed to the ciliate, rarely developed infections; thus, indicating that the parasite requires a wound or break in the cuticle as a portal of entry. For comparative purposes, fiddler crabs, Uca minax, were inoculated with the ciliate in a dose-titration experiment. Low doses of the ciliate (10 per crab) were sometimes able to establish infections, but high intensity infections developed quickly at doses over 500 ciliates per crab. Chemotaxis studies were initiated to determine if the ciliate preferentially selected blue crab serum (BCS) over other nutrient sources. Cultures grown on medium with BCS or fetal bovine serum showed some conditioning in their selection for different media, but the outcome in choice experiments indicated that the ciliate was attracted to BCS and not seawater. Our findings indicate that O. stellarum is a facultative parasite of blue crabs. It can cause infections in exposed crabs at 10-15°C, but it requires a portal of entry for successful host invasion, and it may find injured hosts using chemotaxis. Copyright © 2013 Elsevier Inc. All rights reserved.

  11. EFFECTS OF HYPOXIA ON GENE AND PROTEIN EXPRESSION IN THE BLUE CRAB, CALLINECTES SAPIDUS. (R829458C003)

    Science.gov (United States)

    Increases in hypoxic conditions are one of the major factors responsible for declines in estuarine habitat quality, yet to date there are no indicators for recognizing populations of estuarine organisms that are suffering from chronic hypoxic stress. Here we test the hypothesi...

  12. Variations in prevalence of viral, bacterial, and rhizocephalan diseases and parasites of the blue crab (Callinectes sapidus).

    Science.gov (United States)

    Rogers, Holly A; Taylor, Sabrina S; Hawke, John P; Anderson Lively, Julie A

    2015-05-01

    Prevalence of blue crab diseases and parasites has not been consistently monitored in the Gulf of Mexico. To establish current prevalence levels and to more fully understand population dynamics, commercial landing trends, and effects of future natural and anthropogenic disasters on animal health, we measured the prevalence of white spot syndrome virus (WSSV), Loxothylacus texanus, shell disease, and Vibrio spp. in blue crabs collected from Louisiana in 2013 and the beginning of 2014. We used PCR to detect WSSV and L. texanus infections, visual gross diagnosis for L. texanus externae and shell disease, and standard microbiological culture techniques and biochemical testing for Vibrio spp. We found no crabs infected with WSSV or L. texanus. Absence of L. texanus parasitization was expected based on the sampled salinities and the sampling focus on large crabs. Shell disease was present at a level of 54.8% and was most prevalent in the winter and summer and least prevalent in the spring. Vibrio spp. were found in the hemolymph of 22.3% of the crabs and prevalence varied by site, season, and sex. Additionally, three of 39 crabs tested were infected with reo-like virus. Copyright © 2015 Elsevier Inc. All rights reserved.

  13. Occurrence of the Atlantic blue crab Callinectes sapidus Rathbun, 1896 in two Mediterranean coastal habitats: Temporary visitor or permanent resident?

    Science.gov (United States)

    Mancinelli, Giorgio; Carrozzo, Leonardo; Costantini, Maria Letizia; Rossi, Loreto; Marini, Gabriele; Pinna, Maurizio

    2013-12-01

    Coastal habitats worldwide are threatened by invasive alien species (IAS) that can alter community and ecosystem processes. Invasions are of particular concern for the Mediterranean Sea, and IAS-related descriptors of good ecological status have been recently proposed in European reference regulations.

  14. Prevalence of Vibrio parahaemolyticus, and Vibrio vulnificus in blue crabs (Callinectes sapidus), seawater and sediments of the Maryland Coastal Bays.

    Science.gov (United States)

    Rodgers, C; Parveen, S; Chigbu, P; Jacobs, J; Rhodes, M; Harter-Dennis, J

    2014-10-01

    To determine the prevalence of total and pathogenic Vibrio parahaemolyticus (Vp) and V. vulnificus (Vv) in blue crabs, water and sediment from the Maryland Coastal Bays (MCBs), USA. Crab, haemolymph, sediment and seawater samples were collected monthly from four sites in MCBs from February 2012 through October 2012 with environmental parameters recorded. The most-probable-number (MPN) methodology was used to enumerate Vp and Vv with presumptive colonies and the presence of virulence markers confirmed using polymerase chain reaction (PCR). Results indicate that blue crabs contained both Vp and Vv at densities (7·28 and 5·43 log MPN g(-1) , respectively) higher than those reported for bivalves. In addition, markers for clinically relevant strains of both species were detected in over 30% of samples. Haemolymph, sediment and seawater samples were also routinely positive for both species and clinically relevant strains, but generally at lower densities than found in crabs (4·27, 3·28, and 2·39 log MPN g(-1) per ml(-1) Vp, and 4·28, 2·49 and 2·38 log MPN g(-1) per ml(-1) Vv). Blue crabs concentrate Vp and Vv at levels greater than found in water or sediment. While changes in abundance associated with temperature are apparent, there is little evidence to support differences among sampling locations. These results highlight the potential for blue crab related vibriosis and the importance of proper handling, cooking and care of this popular seafood before consumption. © 2014 The Society for Applied Microbiology.

  15. Fisheries economics and fisheries management

    DEFF Research Database (Denmark)

    Andersen, Peder

    2013-01-01

    Professor Rögnvaldur Hannesson's influence on the development and history of fisheries economics is unquestionable. Also, he has strongly pointed out the potential gains from a more active use of fisheries economics in fisheries management. In light of this, one may ask if fisheries economists have...... spent too much time on fundamentals in fisheries economics at the expense of the development of applicable models for fisheries managers? Of course, this question is relevant only IF fisheries economics and fisheries economists have a role to play in fisheries management....

  16. Dynamique de l'exploitation des crabes nageurs callinectes ...

    African Journals Online (AJOL)

    ... pression exercée par la pêche et la fermeture progressive de la passe qui influence directement le cycle hydrologique lagunaire et par ricochet le recrutement des crabes nageurs de la lagune de Grand-lahou. Mots-clés : crustacés, décapodes, portunidae, crabes nageurs, callinectes amnicola, lagune de Grand-Lahou, ...

  17. Population biology and distribution of the portunid crab Callinectes ornatus (Decapoda: Brachyura in an estuary-bay complex of southern Brazil

    Directory of Open Access Journals (Sweden)

    Timoteo T. Watanabe

    2014-08-01

    Full Text Available Trawl fisheries are associated with catches of swimming crabs, which are an important economic resource for commercial as well for small-scale fisheries. This study evaluated the population biology and distribution of the swimming crab Callinectes ornatus (Ordway, 1863 in the Estuary-Bay of São Vicente, state of São Paulo, Brazil. Crabs were collected from a shrimp fishing boat equipped with a semi-balloon otter-trawl net, on eight transects (four in the estuary and four in the bay from March 2007 through February 2008. Specimens caught were identified, sexed and measured. Samples of bottom water were collected and the temperature and salinity measured. A total of 618 crabs were captured (332 males, 267 females and 19 ovigerous females, with a sex ratio close to 1:1. A large number of juveniles were captured (77.67%. Crab spatial distributions were positively correlated with salinity (Rs = 0.73, p = 0.0395 and temperature (Rs = 0.71, p = 0.0092. Two peaks of recruitment occurred, in summer and autumn, and ovigerous females were mostly captured during summer, showing a seasonal reproductive pattern. The results showed that C. ornatus uses the bay as a nursery area for juvenile development. Callinectes ornatus is not yet a legally protected species, and the minimum allowed size of crabs caught in the area, although already restricted, should be carefully evaluated since the removal of large numbers of juveniles could negatively impact the local population.

  18. Description of laboratory reared first zoea of Callinectes danae Smith (Crustacea, Decapoda, Portunidae)

    OpenAIRE

    Cheruparambil Sankarankutty; Sung Yun Hong; Kwang Bong Kim

    1999-01-01

    A detailed description of laboratory reared first zoea larva of Callinectes danae Smith, 1869 is given. The larvae utilized for this study were reared in vitro in a special incubator. A comparison with larvae of other species is also attempted.

  19. Fisheries Districts

    Data.gov (United States)

    Vermont Center for Geographic Information — The Fisheries districts data layer is part of a larger dataset that contains administrative boundaries for Vermont's Agency of Natural Resources. The dataset...

  20. Idade e crescimento de Callinectes danae e C. ornatus (Crustacea, Decapoda na Baía de Guanabara, Rio de Janeiro, Brasil Age and growth of Callinectes danae and C. ornatus (Crustacea, Decapoda in Guanabara Bay, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Karina A. Keunecke

    2008-06-01

    Full Text Available Callinectes danae Smith, 1869 e C. ornatus Ordway, 1863 constituem uma parcela importante da produção pesqueira na Baía de Guanabara. Ambas espécies compõem uma fração significativa da fauna-acompanhante sendo exaustivamente descartadas pelas pescarias de arrasto de camarões na costa brasileira. As curvas de crescimento de C. danae e C. ornatus foram calculadas por meio da análise de progressão modal. Para estimar os parâmetros biológicos, foi aplicado o modelo de crescimento de Bertalanffy e para estimar a longevidade foi usada a sua fórmula inversa. As curvas de crescimento foram: ♂ LC = 120 (1 - e -0,005t , ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t e ♀ LC = 110 (1 - e -0,005t , respectivamente para C. danae e C. ornatus. A longevidade alcançada para as duas espécies foi em torno de 2,5 anos, além de validar as curvas de crescimento. O estudo do crescimento em crustáceos é de extrema importância, pois além de fornecer a informação biológica básica para o grupo, os parâmetros estimados subsidiam o ordenamento e manejo pesqueiro das espécies exploradas.Callinectes danae Smith, 1869 and C. ornatus Ordway, 1863 constitute an important portion from the fishing products at Guanabara Bay. Both species compose a significant by-catch fraction being a lot discarded during shrimp trawlings along Brazilian coast. Growth curves were estimated by modal progression analysis. For the biological parameters it was applied the Bertalanffy growth function and for the age it was used its inverse formula. Growth curves of C. danae and C. ornatus were respectively: ♂ LC = 120 (1 - e -0,005t, ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t and ♀ LC = 110 (1 - e -0,005t. The age for both species reached around 2.5 years, besides to confirm growth curves. Growth study in crustaceans is very important, because besides supplying biological information it subsidizes fishery management for exploted species.

  1. Comparison of fatty acid and proximate compositions of the body and claw of male and female blue crabs (Callinectes sapidus) from different regions of the Mediterranean coast.

    Science.gov (United States)

    Kuley, Esmeray; Ozoğul, Fatih; Ozogul, Yesim; Olgunoglu, A Ilkan

    2008-01-01

    Fatty acid and proximate compositions of the body and claw of male and female blue crabs from Akyatan Lagoon and Hurma strait were investigated. Male blue crab meat had a higher protein and fat content, and lower moisture and ash content, than that of the female from Akyatan Lagoon. Moreover, there were variations of protein and fat amounts in both female crab meats between Akyatan Lagoon and Hurma strait. The dominant saturated fatty acids were palmitic acid (16:0; range from approximately 12% to 15%) and stearic acid (18:0; range from approximately 7.5% to 16.1%) for all samples. The total monounsaturated fatty acid content in the body of female crabs from Akyatan Lagoon was higher than those of Hurma Strait (22.04% versus 7.55%). There were no statistically significant differences (P>0.05) between eicosapentaenoic acid concentrations in body meat of the male crab than those of female crab meat from Akyatan Lagoon (Pcrabs from Akyatan Lagoon and those of female crabs from Hurma strait. The total n3 was detected as 27.33% in body meat whereas it was 24.39% in claw meat of the male crab from Akyatan Lagoon. Those values were almost similar in the body and claw meat of female crab from Akyatan Lagoon.

  2. Effect of the amino acid histidine on the uptake of cadmium from the digestive system of the blue crab, Callinectes sapidus

    Energy Technology Data Exchange (ETDEWEB)

    Pecon, J.; Powell, E.N.

    1981-07-01

    The digestive tract functions in the storage, metabolism, and excretion of heavy metals in invertebrates. The importance of the digestive tract and the processes governing digestion and absorption of nutrients in heavy metal uptake is becoming increasingly clear. The results of this study suggest that in order to understand the processes controlling heavy metal uptake in invertebrates, it will be necessary to investigate the role that digestion and absorption play in determining the transport rate of metals across the gut wall into the blood. For example, some amino acids increase metal absorption rates, whereas other compounds, such as phytate, decrease metal absorption rates. The results also suggest that experimental designs to investigate metal absorption must include an appreciation of the significant role that the feeding state of the animal (e.g. fed or starved) and the role chelators, particularly those produced by the organisms themselves during digestion, may play in the observed uptake rates of metal ions.

  3. Tolerance, bioenergetics, and biochemical composition of the blue crab, Callinectes sapidus rathbun, exposed to the water-soluble fraction of South Louisiana crude oil

    Energy Technology Data Exchange (ETDEWEB)

    Wang, S.Y.

    1986-01-01

    Blue crabs were highly tolerant to petroleum hydrocarbons. Rates of energy intake decreased with increasing hydrocarbon concentration. Although energy expenditure rates of crabs exposed to 2504 ppb were not significantly higher than that of control crabs, they were significantly higher than those of crabs exposed to 820 and 1476 ppb. Molting was delayed in crabs exposed to 1476 and 2504 ppb. Crab growth was significantly reduced in a dose-dependent manner. The correlation between scope for growth and tissue growth was highly significant, indicating a bioenergetic basis for the decreased growth in crabs exposed to petroleum hydrocarbons. RNA content of crabs exposed to crude oil was significantly reduced on all sampling dates. Protein content of crabs exposed to crude oil was lower than that of control crabs on days 14 and 21. DNA content was not significantly different from that of control crabs. RNA:DNA and protein:DNA ratio were significantly reduced in crabs exposed to crude oil. The significant correlations suggest the possibility of their use as indicators of physiological condition. Significant differences in lipid content and concentration were observed. Analysis of five lipid classes indicate that structural lipids were less affected than lipids used for energy storage among crabs exposed to crude oil. The observed changes growth pattern and biochemical composition suggest that the pattern of energy utilization was altered. Among crabs exposed to petroleum hydrocarbons, growth in size took place despite little increase in tissue content. Available energy was used for growth with little being stored in lipid reserves.

  4. Seasonal and Inter-annual Variability in Modeled Larval Dispersal and Population Connectivity of Blue Crabs (Callinectes sapidus) in the Northern Gulf of Mexico

    Science.gov (United States)

    Gyory, J.; Jones, B.; Ko, D. S.; Taylor, C.

    2016-02-01

    Larval dispersal trajectories and their resulting population connectivity patterns are known to be key drivers of population dynamics for many marine organisms. However, few studies to date have examined the temporal variability in population connectivity. Here, we model the larval dispersal and population connectivity of blue crabs in the northern Gulf of Mexico from 2003-2012 and use network analyses to understand how they vary over seasonal and inter-annual scales. We found that in all years, the Mississippi River Delta is a barrier to dispersal. Few larvae cross it and settle successfully. In some years (2004, 2007, 2008, and 2009), 1-2 locations (Adams Bay and Chandeleur Sound) had high (> 0.3) betweenness centrality. These locations are likely to be important for maintaining population connectivity in the region, since more than 30% of larval pathways are predicted to pass through them. Connectivity matrices suggest that some estuaries have consistently high larval retention rates. These include West Cote Blanche Bay, Chandeleur Sound, and, in some years, Pensacola Bay and Atchafalaya Bay. Within the spawning season, we observe a decline in average vertex degree and average source strength in every year. This suggests that seasonal declines in the strength of along-shore currents produce consistent reductions in population connectivity through the spawning season.

  5. Use of DNA strand damage (Comet assay) and embryo hatching effects to assess contaminant exposure in blue crab (Callinectes sapidus) embryos

    Energy Technology Data Exchange (ETDEWEB)

    Lee, R.F.; Steinert, S.A.; Nakayama, K.; Oshima, Y.

    1999-07-01

    After fertilization, blue crab eggs are embedded in a sponge which is attached to the female abdomen during embryo development. Embryos after 9 stages in the egg sac hatch into a swimming zoea stage (stage 10). The authors have developed a bioassay where embryo development is monitored in culture plates with and without toxicants in the water. Toxicant effects are based on determining the percentage of embryos which hatch to zoea. Hatching EC{sub 50} (toxicant concentration at which 50% of the embryos fail to hatch) for a number of pesticides, organometallics and metals were determined. The test takes from 2 to 6 days depending on the embryo stage selected for the study. In addition to embryo development effects the prevalence of DNA single-strand breaks in individual embryo cells were determined using the single cell gel electrophoresis method (Comet assay). A good correlation between DNA strand breakage and embryo defects was found after exposure to genotoxic contaminants. Thus, the bioassay linking DNA damage to embryo hatching effects is rapid, sensitive and mechanistically relevant.

  6. Effects of Hypoxia and Hypercapnic Hypoxia on Oxygen Transport and Acid-Base Status in the Atlantic Blue Crab, Callinectes sapidus, During Exercise.

    Science.gov (United States)

    Lehtonen, Mark P; Burnett, Louis E

    2016-11-01

    The responses of estuarine invertebrates to hypoxic conditions are well established. However, many studies have investigated hypoxia as an isolated condition despite its frequent co-occurrence with hypercapnia (elevated CO 2 ). Although many studies suggest deleterious effects, hypercapnia has been observed to improve blue crab walking performance in hypoxia. To investigate the physiological effects of combined hypercapnic hypoxia, we measured Po 2 , pH, [l-lactate], Pco 2 , and total O 2 in pre- and postbranchial hemolymph sampled from blue crabs during walking exercise. Crabs walked at 8 m min -1 on an aquatic treadmill in normoxic (100% air saturation), moderately hypoxic (50%), and severely hypoxic (20%) seawater with and without the addition of hypercapnia (about 2% CO 2 ). Respiration was almost completely aerobic in normoxic conditions, with little buildup of lactate. During exercise under severe hypoxia, lactate increased from 1.4 to 11.0 mM, indicating a heavy reliance on anaerobic respiration. The O 2 saturation of arterial hemocyanin was 47% in severe hypoxia after 120 min, significantly lower than in normoxia (80%). However, the addition of hypercapnia significantly increased the percentage saturation of arterial hemocyanin in severe hypoxia to 92% after 120 min of exercise, equivalent to normoxic levels. Hypercapnia in severe hypoxia also caused a marked increase in hemolymph Pco 2 (around 1.1 kPa), but caused only a minor decrease in pH of 0.1 units. We suggest that the improved O 2 saturation at the gills results from a specific effect of molecular CO 2 on hemocyanin oxygen binding affinity, which works independently of and counter to the effects of decreased pH. © 2016 Wiley Periodicals, Inc.

  7. CROATIAN FISHERIES IN 2004

    OpenAIRE

    Irena Jahutka; Ante Mišura; Josip Suić; Vlasta Frančević; Zlatko Homen; Josip Marković

    2005-01-01

    This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries), marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms), as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (fres...

  8. Introduction to fisheries oceanography

    Digital Repository Service at National Institute of Oceanography (India)

    Sumitra-Vijayaraghavan

    Fisheries oceanography can be applied to fisheries ecology, fisheries management and practical fishing. Physico-chemical parameters of the environment (temperature, currents, waves, light, oxygen and salinity) have profound effect on fish...

  9. Etude microscopique de L'ovogenese chez la femelle de Callinectes ...

    African Journals Online (AJOL)

    Histological survey showed that the ovary of Callinectes amnicola was made of two elements, lobes of ovogonia and an amorphous zone. Both of them participate into ovogenesis. According to structural and ultrastructural aspects, process of the ovogenesis comprises five stages in which ovogonia change successively in ...

  10. Description of laboratory reared first zoea of Callinectes danae Smith (Crustacea, Decapoda, Portunidae

    Directory of Open Access Journals (Sweden)

    Cheruparambil Sankarankutty

    1999-01-01

    Full Text Available A detailed description of laboratory reared first zoea larva of Callinectes danae Smith, 1869 is given. The larvae utilized for this study were reared in vitro in a special incubator. A comparison with larvae of other species is also attempted.

  11. The occurrence of Callinectes arcuatus ordway, 1863 (Crustacea, Decapoda, Portunidae in Bahia, Brazil

    Directory of Open Access Journals (Sweden)

    Edilson Pires de Gouvêa

    1987-01-01

    Full Text Available During the study of the Carcinofauna of the Bahian Coast, some Brachyura Portunidae were found. Some of these animals were Callinectes arcuatus Ordway, 1863 which has its distribution restricted to the Pacific Ocean, from California to Peru and the Galapagos Islands. This is the first occurrence of this species reported from the Atlantic Ocean and the Brazilian Coast (Bahia, 38º50'Wand 12º50'S.Durante o estudo da carcinofauna do litoral baiano, muitos Braquiuros Portunidae foram encontrados. Alguns destes animais foram Callinectes arcuatus Ordway, 1863 que possuia sua distribuição restrita da Califórnia ao Peru e Ilhas Galápagos, no Oceano Pacífico. Esta é a primeira ocorrência desta espécie no Oceano Atlântico e na Costa Brasileira. (Bahia, 12º50'S e 38º50'W.

  12. 75 FR 17070 - Fisheries in the Western Pacific; Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery...

    Science.gov (United States)

    2010-04-05

    ... National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XU60 Fisheries in the Western Pacific; Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery Closure AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ] ACTION...

  13. Fishery Performance Indicators

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Performance indicators for landings, effort, revenue and distribution of revenue are collected for various fisheries nation-wide. The fisheries include catch and...

  14. Supply regimes in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max

    2006-01-01

    Supply in fisheries is traditionally known for its backward bending nature, owing to externalities in production. Such a supply regime, however, exist only for pure open access fisheries. Since most fisheries worldwide are neither pure open access, nor optimally managed, rather between the extrem...

  15. Inland capture fisheries.

    Science.gov (United States)

    Welcomme, Robin L; Cowx, Ian G; Coates, David; Béné, Christophe; Funge-Smith, Simon; Halls, Ashley; Lorenzen, Kai

    2010-09-27

    The reported annual yield from inland capture fisheries in 2008 was over 10 million tonnes, although real catches are probably considerably higher than this. Inland fisheries are extremely complex, and in many cases poorly understood. The numerous water bodies and small rivers are inhabited by a wide range of species and several types of fisher community with diversified livelihood strategies for whom inland fisheries are extremely important. Many drivers affect the fisheries, including internal fisheries management practices. There are also many drivers from outside the fishery that influence the state and functioning of the environment as well as the social and economic framework within which the fishery is pursued. The drivers affecting the various types of inland water, rivers, lakes, reservoirs and wetlands may differ, particularly with regard to ecosystem function. Many of these depend on land-use practices and demand for water which conflict with the sustainability of the fishery. Climate change is also exacerbating many of these factors. The future of inland fisheries varies between continents. In Asia and Africa the resources are very intensely exploited and there is probably little room for expansion; it is here that resources are most at risk. Inland fisheries are less heavily exploited in South and Central America, and in the North and South temperate zones inland fisheries are mostly oriented to recreation rather than food production.

  16. Inland capture fisheries

    Science.gov (United States)

    Welcomme, Robin L.; Cowx, Ian G.; Coates, David; Béné, Christophe; Funge-Smith, Simon; Halls, Ashley; Lorenzen, Kai

    2010-01-01

    The reported annual yield from inland capture fisheries in 2008 was over 10 million tonnes, although real catches are probably considerably higher than this. Inland fisheries are extremely complex, and in many cases poorly understood. The numerous water bodies and small rivers are inhabited by a wide range of species and several types of fisher community with diversified livelihood strategies for whom inland fisheries are extremely important. Many drivers affect the fisheries, including internal fisheries management practices. There are also many drivers from outside the fishery that influence the state and functioning of the environment as well as the social and economic framework within which the fishery is pursued. The drivers affecting the various types of inland water, rivers, lakes, reservoirs and wetlands may differ, particularly with regard to ecosystem function. Many of these depend on land-use practices and demand for water which conflict with the sustainability of the fishery. Climate change is also exacerbating many of these factors. The future of inland fisheries varies between continents. In Asia and Africa the resources are very intensely exploited and there is probably little room for expansion; it is here that resources are most at risk. Inland fisheries are less heavily exploited in South and Central America, and in the North and South temperate zones inland fisheries are mostly oriented to recreation rather than food production. PMID:20713391

  17. Metal, metallothionein and glutathione levels in blue crab (Callinectes sp.) specimens from southeastern Brazil.

    Science.gov (United States)

    Lavradas, Raquel Teixeira; Hauser-Davis, Rachel Ann; Lavandier, Ricardo Cavalcanti; Rocha, Rafael Christian Chávez; Saint' Pierre, Tatiana D; Seixas, Tércia; Kehrig, Helena Amaral; Moreira, Isabel

    2014-09-01

    Metal concentrations (Cu, Pb, Zn and Cd) were determined in muscle, gills, soft tissues and eggs in male, non-ovigerous and ovigerous female Callinectes sp. specimens from a reference site in Southeastern Brazil. Metallothionein (MT) and reduced glutathione (GSH) levels were also determined. Results demonstrate that sex has a significant influence on metal, MT and GSH concentrations. Significant maternal transfer of Pb and Zn from ovigerous females to eggs was verified, while female crabs, both ovigerous and non-ovigerous, showed elevated GSH and MT in viscera when compared to males, indicating possible MT role in excreting metals to eggs in ovigerous females of this species. Several strong statistical correlations between metals and MT indicate MTs role in detoxification of both toxic and essential elements in different organs. Pb and Zn were significantly correlated to GSH, indicating oxidative stress caused by the former and a direct link between Zn and GSH in maintaining homeostasis. Regarding human consumption, metal concentrations were lower than the maximum permissible levels established by international and Brazilian regulatory agencies, indicating that this species is safe for human consumption concerning this parameter. The presence of metals in Callinectes sp., however, is still of importance considering that this is a key species within the studied ecosystem and, therefore, plays a major role in the transference of pollutants to higher trophic levels. In addition, the presence of significant metal concentrations found in eggs must be considered in this context, since crab eggs are eaten by several other species, such as shorebirds, seabirds, and fish. Also, to the best of our knowledge, this is the first study regarding both MT and GSH levels in Callinectes sp. eggs and is of interest in the investigation of molecular mechanisms regarding metal exposure in these crustaceans. Data reported in this study support the conclusions from previous reports

  18. Financial analysis of commercial salmon fisheries: marine & inland fisheries

    National Research Council Canada - National Science Library

    2014-01-01

    ... in commercial and recreational fisheries. To estimate the financial inputs required for the BCIOM analysis, Counterpoint designed and deployed a financial analysis model of the commercial salmon fishery in which the commercial fishery...

  19. Oyster reefs as natural breakwaters mitigate shoreline loss and facilitate fisheries.

    Directory of Open Access Journals (Sweden)

    Steven B Scyphers

    Full Text Available Shorelines at the interface of marine, estuarine and terrestrial biomes are among the most degraded and threatened habitats in the coastal zone because of their sensitivity to sea level rise, storms and increased human utilization. Previous efforts to protect shorelines have largely involved constructing bulkheads and seawalls which can detrimentally affect nearshore habitats. Recently, efforts have shifted towards "living shoreline" approaches that include biogenic breakwater reefs. Our study experimentally tested the efficacy of breakwater reefs constructed of oyster shell for protecting eroding coastal shorelines and their effect on nearshore fish and shellfish communities. Along two different stretches of eroding shoreline, we created replicated pairs of subtidal breakwater reefs and established unaltered reference areas as controls. At both sites we measured shoreline and bathymetric change and quantified oyster recruitment, fish and mobile macro-invertebrate abundances. Breakwater reef treatments mitigated shoreline retreat by more than 40% at one site, but overall vegetation retreat and erosion rates were high across all treatments and at both sites. Oyster settlement and subsequent survival were observed at both sites, with mean adult densities reaching more than eighty oysters m(-2 at one site. We found the corridor between intertidal marsh and oyster reef breakwaters supported higher abundances and different communities of fishes than control plots without oyster reef habitat. Among the fishes and mobile invertebrates that appeared to be strongly enhanced were several economically-important species. Blue crabs (Callinectes sapidus were the most clearly enhanced (+297% by the presence of breakwater reefs, while red drum (Sciaenops ocellatus (+108%, spotted seatrout (Cynoscion nebulosus (+88% and flounder (Paralichthys sp. (+79% also benefited. Although the vertical relief of the breakwater reefs was reduced over the course of our study

  20. 77 FR 38738 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-06-29

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BB35 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Southern New England Skate Bait Trawl Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric...

  1. 77 FR 64305 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-10-19

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BC50 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Cape Cod Spiny Dogfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  2. 75 FR 1023 - International Fisheries Regulations; Fisheries in the Western Pacific; Pelagic Fisheries; Hawaii...

    Science.gov (United States)

    2010-01-08

    ... CFR Part 665 [Docket No. 080225267-91393-03] RIN 0648-AW49 International Fisheries Regulations; Fisheries in the Western Pacific; Pelagic Fisheries; Hawaii-based Shallow-set Longline Fishery; Correction AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  3. 77 FR 25117 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2012-04-27

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BB35 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for the Southern New England Skate Bait Trawl Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric...

  4. Hawaii's Pelagic Fisheries

    OpenAIRE

    Boggs, Christofer H.; Ito , Russell Y.

    1993-01-01

    Hawaii's diverse pelagic fisheries supply the bulk of the State's total catch. The largest Hawaii fishery is the recently expanded longline fishery, which now lands about 4,400 metric tons (t) of broadbill swordfish, Xiphias gladius; 1,500 t of bigeye tuna, Thunnus obesus, and 3,000 t of other pelagic species annually. The increased catch of these other species has raised concerns regarding the continued availability of yellowfin tuna, T. albacares; blue marlin, Makaira mazara; and mahimahi, ...

  5. Regulating fisheries under uncertainty

    DEFF Research Database (Denmark)

    Hansen, Lars Gårn; Jensen, Frank

    2017-01-01

    Regulator uncertainty is decisive for whether price or quantity regulation maximizes welfare in fisheries. In this paper, we develop a model of fisheries regulation that includes ecological uncertainly, variable economic uncertainty as well as structural economic uncertainty. We aggregate...... qualification of the pro-price regulation message dominating the fisheries economics literature. We also believe that the model of a fishery developed in this paper could be applied to the regulation of other renewable resources where regulators are subject to uncertainty either directly or with some...

  6. Maturidade sexual das fêmeas de Callinectes danae (Crustacea, Decapoda, Portunidae nos estuários dos rios Botafogo e Carrapicho, Itamaracá, PE, Brasil Sexual maturity of females of Callinectes danae (Crustacea, Decapoda, Portunidae in the estuaries of the Botafogo and Carrapicho rivers, Itamaracá, PE, Brazil

    Directory of Open Access Journals (Sweden)

    Aline do Vale Barreto

    2006-06-01

    Full Text Available Callinectes danae (Smith, 1869, siri-azul, constitui um importante recurso pesqueiro nos estuários dos rios Botafogo e Carrapicho. O objetivo do presente estudo foi estimar a maturidade sexual das fêmeas de C. danae. Os espécimes foram capturados, entre outubro de 2003 a junho de 2004, com auxílio de um barco de pesca equipado com rede de arrasto do tipo "wing-trawl" e arrastados durante 5 minutos. No laboratório, os siris foram contados, numerados, sexados, pesados e mensurados. A largura da carapaça (LC foi medida na base do espinho lateral e a largura do abdome (LA mensurada na altura da articulação do quinto esternito abdominal. Um total de 596 fêmeas de C. danae foram analisadas: 417 (69,97% no rio Botafogo e 179 (30,03% no Carrapicho; as fêmeas não-ovígeras apresentaram LC de 18,38 a 101 mm (59,14 ± 13,65 mm e 26,70 a 83,48 mm (59,16 ± 13,77 mm, nos respectivos rios; a LC de fêmeas ovígeras foi de 57,04 a 83,30 mm (67,68 ± 6,56 mm. As médias de larguras das carapaças não apresentaram diferenças estatisticamente significativas O conhecimento da maturidade sexual das fêmeas de Callinectes danae é de grande importância para o seu manejo e conservação. O L50 gonadal foi estimado em 63,58 mm (chi2 = 140,47; g.l. = 1; p Callinectes danae (Smith, 1869 is an important fishery resource in the Botafogo and Carrapicho river estuaries. The aim of this study was to estimate the sexual maturity of C. danae. Specimens were captured between October 2003 and June 2004 with the aid of a fishing boat equipped with a wing-trawl and trawling took place during 5 minutes each time. In the laboratory, the crabs were counted, numbered, sexed, weighed, and measured. The carapace width (CW was measured at the base of the lateral spine and the abdomen width (AW was measured at the point of the articulation of the fifth abdominal esternite. A total of 596 females of C. danae were analyzed: 417 (69.97% from Botafogo River and 179 (30.03% from

  7. A preliminary assessment of metal bioaccumulation in the blue crab, Callinectes danae S., from the Sao Vicente Channel, Sao Paulo State, Brazil.

    Science.gov (United States)

    Bordon, Isabella C A C; Sarkis, Jorge E S; Tomás, Acácio R G; Souza, Marcelo R; Scalco, Allan; Lima, Mariana; Hortellani, Marcos A

    2012-04-01

    The concentrations of metals in tissues of Callinectes danae were evaluated, aiming to determine the bioaccumulation process of this species. Gills presented the highest mean concentrations for most metals, except for Hg (danae of this estuary.

  8. Species composition and gear characteristics of the Macrobrachium fishery of the Cross River Estuary, Nigeria

    Science.gov (United States)

    Nwosu, Francis M.

    2010-03-01

    The Cross River Estuary, Nigeria, is an important shrimping area for artisanal fishermen of the coastal communities. The multi-species Macrobrachium fishery is exploited with three main gears, namely beach seine, push net and trap. Studies on species composition of this fishery recorded thirteen shrimp species, one swimming crab ( Callinectes amnicola) and two fish species ( Eleotris sp. and Pellonula leonensis). The shrimp species identified included Macrobrachium macrobrachion (83.39% and 55.69% by number and weight, respectively), M. vollenhovenii (9.66% and 37.18%), M. equidens (3.8% and 2.87%), juveniles-sub-adults of Penaeus notialis (1.11% and 1.3%), M. dux, M. felicinum, Palaemonetes africanus, Palaemon maculatus, Palaemon elegans, Desmocaris sp., Leander sp., Nematopalaemon hastatus and Alpheus pontederiae. While the selectivity index for trap was 0.25, beach seine and push net had a lower index of 0.063. The results present the first comprehensive and representative report for the Estuary shrimp fishery and will assist in the management of the biodiversity of this ecosystem.

  9. The first finding of Ostrea cf. puelchana (Bivalvia living as epibiont on Callinectes exasperates (Decapoda

    Directory of Open Access Journals (Sweden)

    Silvio Felipe Barbosa Lima

    2017-05-01

    Full Text Available This paper describes the epibiosis of Ostrea cf. puelchana on Callinectes exasperatus (Gerstaecker, 1856, both collected from the estuary of the Paraíba River, in the state of Paraíba, northeastern Brazil. The basibiont crab was captured using a trap installed in mangrove area at a depth of about 2 meters. The oyster was closely attached to the left side of dorsal carapace covering most of the epibranchial, mesobranchial and metabranchial regions. Possible advantages and disadvantages for both the epibiont and the basibiont are discussed. We believe that young O. cf. puelchana may avoid a variety of potential predators due to the considerable movement capacity of C. exasperatus and may also serve as a small protective shield for the basibiont. However, the oyster, which is a bivalve with an epifaunal lifestyle, is likely to be negatively affected, mainly due to burrowing activity of the crab. This is the first record of epibiosis between bivalves of the genus Ostrea Linnaeus, 1758 and crabs of the genus Callinectes Stimpson, 1860.

  10. Framing fishery decline

    NARCIS (Netherlands)

    Bush, S.R.

    2005-01-01

    Fishery decline is interpreted in a number of ways. These interpretations vary considerably from one observer to another, depending on the level at which each interacts with the fishery. Fish stock assessments, predominantly carried out through environmental impact statements, are often not

  11. Nigerian Journal of Fisheries

    African Journals Online (AJOL)

    Today the membership of the society has expanded cutting across all the related disciplines including fisheries scientists, fishing companies and professional industrial fishing/fish farming enthusiasts and entrepreneurs. The Nigerian Journal of Fisheries ... Open Access DOWNLOAD FULL TEXT Subscription or Fee Access ...

  12. Management of complex fisheries

    DEFF Research Database (Denmark)

    Frost, Hans Staby; Andersen, Peder; Hoff, Ayoe

    2013-01-01

    . This is defined as the management scheme which produces the highest net present value over a 25 year period. The assessed management schemes (scenarios) are composed by several measures as used in the Common Fisheries Policy of the European Union for the cod fishery in the Baltic Sea. The scenarios are total...

  13. CROATIAN FISHERIES IN 2007

    Directory of Open Access Journals (Sweden)

    Ante Mišura

    2008-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. The total freshwater fish production in 2007 was 5,797 tons (4,151 tons of warm–water species and 1,646 tons of cold–water species. Total areas and production areas in 2007 was 5,558.66. Total catch of freshwater fish in 2007 was 697 tons. The total marine fish species production in 2007 was 4,000 tons, production of tuna 4,180 tons, mussels 3,000 tons and oysters 1,000,000 pieces. The catch of marine fish was increased by 6.09% comparing to 2006 (increase was noticed for white and blue fish species. During 2007 there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen increased 0.4 % comparing to the last year. The total production of fish products in 2007 was 15,349 tons, which is 11.6 % less comparing to 2006.

  14. Fisheries: hope or despair?

    Science.gov (United States)

    Pitcher, Tony J; Cheung, William W L

    2013-09-30

    Recent work suggesting that fisheries depletions have turned the corner is misplaced because analysis was based largely on fisheries from better-managed developed-world fisheries. Some indicators of status show improvements in the minority of fisheries subjected to formal assessment. Other indicators, such as trophic level and catch time series, have been controversial. Nevertheless, several deeper analyses of the status of the majority of world fisheries confirm the previous dismal picture: serious depletions are the norm world-wide, management quality is poor, catch per effort is still declining. The performance of stock assessment itself may stand challenged by random environmental shifts and by the need to accommodate ecosystem-level effects. The global picture for further fisheries species extinctions, the degradation of ecosystem food webs and seafood security is indeed alarming. Moreover, marine ecosystems and their embedded fisheries are challenged in parallel by climate change, acidification, metabolic disruptors and other pollutants. Attempts to remedy the situation need to be urgent, focused, innovative and global. Copyright © 2013 Elsevier Ltd. All rights reserved.

  15. 78 FR 26518 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Exempted Fishery for...

    Science.gov (United States)

    2013-05-07

    ... Waters East and West of Cape Cod, MA AGENCY: National Marine Fisheries Service (NMFS), National Oceanic... participate in the spiny dogfish fishery. According to the Mid-Atlantic Fishery Management Council's analysis... have historically depended on the spiny dogfish fishery off Cape Cod, MA. This exemption was requested...

  16. 78 FR 65887 - International Fisheries; Pacific Tuna Fisheries; 2013 Bigeye Tuna Longline Fishery Closure in the...

    Science.gov (United States)

    2013-11-04

    ... National Oceanic and Atmospheric Administration 50 CFR Part 300 RIN 0648-XC922 International Fisheries; Pacific Tuna Fisheries; 2013 Bigeye Tuna Longline Fishery Closure in the Eastern Pacific Ocean AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce...

  17. Fisheries Reclamation Events

    Data.gov (United States)

    Minnesota Department of Natural Resources — This layer shows waterbodies that have been treated for fish removal(i.e., reclaimed)by DNR Fisheries. Some waterbodies have had multiple treatments. Attributes...

  18. Morocco - Artisanal Fisheries

    Data.gov (United States)

    Millennium Challenge Corporation — The final performance evaluation roadmap for the Small-Scale Fisheries Project (PPA-MCC) is developed using a grid constructed around indicators relating to Project...

  19. Fishery Biology Database (AGDBS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Basic biological data are the foundation on which all assessments of fisheries resources are built. These include parameters such as the size and age composition of...

  20. International Fisheries Agreements

    DEFF Research Database (Denmark)

    Pintassilgo, Pedro; Kronbak, Lone Grønbæk; Lindroos, Marko

    2015-01-01

    This paper surveys the application of game theory to the economic analysis of international fisheries agreements. The relevance of this study comes not only from the existence of a vast literature on the topic but especially from the specific features of these agreements. The emphasis of the survey...... is on coalition games, an approach that has become prominent in the fisheries economics literature over the last decade. It is shown that coalition games were first applied to international fisheries agreements in the late 1990s addressing cooperative issues under the framework of characteristic function games...... and stability of international fisheries agreements. A key message that emerges from this literature strand is that self-enforcing cooperative management of internationally shared fish stocks is generally difficult to achieve. Hence, the international legal framework and regulations play a decisive role...

  1. 77 FR 67305 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-11-09

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Specifications and Management Measures... butterfish fishery, which is managed as part of the Atlantic Mackerel, Squid, and Butterfish Fishery..., Squid, and Butterfish Fishery Management Plan. FOR FURTHER INFORMATION CONTACT: Aja Szumylo, Fishery...

  2. 75 FR 34092 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery

    Science.gov (United States)

    2010-06-16

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-AY41 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery AGENCY: National Marine Fisheries Service (NMFS... States Marine Fisheries Commission's (Commission) Interstate Fishery Management Plan (ISFMP) for weakfish...

  3. CROATIAN FISHERIES IN 2006.

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2007-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2005 there have been noticed production increase in coldwater fish species. The total freshwater fish production in 2006 was 6,328 tons (4,599 tons of warm–water species and 1,729 tons of cold–water species. Total areas and production areas were decreased comparing to 2005 in all categories of production areas. Total catch of freshwater fish in 2006 was 674 tons. The total marine fish species production in 2006 was 3,500 tons, production of tuna 6,700 tons, mussels 3,500 tons and oysters 1,000,000 pieces. The catch of marine fish was increased by 9.21% comparing to 2005 (increase was noticed for white and blue fish species. During 2006 there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen decreased 1% comparing to the last year. The total production of fish products in 2006 was 17,362 tons, which is 2.46% more comparing to 2005.

  4. 50 CFR 300.106 - Exploratory fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Exploratory fisheries. 300.106 Section 300.106 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Antarctic Marine Living Resources § 300.106 Exploratory fisheries. (a) An exploratory fishery, for...

  5. USVI commercial fisheries cost data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — To assist the Caribbean Fishery Management Council in managing marine living resources in the United States Virgin Islands, the Southeast Fisheries Science Center...

  6. Antioxidant potential analysis of P. ostreatus, P. sajor-caju, P. sapidus and P. columbinus.

    Science.gov (United States)

    Irshad, A; Shahid, M; Asghar, M; Khan, J A

    2017-01-01

    The present study was conducted to evaluate the antioxidant activity of ethanol, n-hexane, dichloromethane, ethyl acetate and water extracts of four different Pleurotus spps. P. ostreatus, P. sajor-caju, P. sapidus and P. columbinus. The extraction was performed by classical organic solvent extraction (COSE). The extracts of Pleurotus spps. contained appreciable levels of total phenolic contents (TPC) (0.95-19.49 GAE, mg/g) and total flavonoid contents (0.85-3.73 CE, mg/g). All Pleurotus spps. also contained considerable DPPH radical scavenging activity, showing IC50 (19.15-54.50%) and reducing power (0.50-2.94 nm), respectively. The ascorbic acid content was in the range of (2.90-5.97 mg/g) for all Pleurotus spps. All studied Pleurotus spps. showed potential antioxidant activity. The results of four different Pleurotus spps. extracts showed that they can be used as a good food ingredient, and as a medicinal mushroom for digestive ailments, as well as in the pharmaceutical industry and in cosmetics.

  7. Fisheries and climate

    DEFF Research Database (Denmark)

    Brander, Keith

    2009-01-01

    Fish stocks and the fisheries based on them have always experienced variability due to climate. Changes in temperature, salinity, winds, ocean currents, oxygen, and other factors affect their distribution, growth, survival, and recruitment. Examples of such effects are given for several regions...... of the oceans and the processes are described. Poleward distribution shifts have occurred since the 1960s and can be attributed to the effects of anthropogenic climate change with a high degree of confidence. In addition to climate effects, fisheries are subjected to other anthropogenic stresses, including high...... fishing mortality, loss of habitat, pollution, and introduction of alien species. These interact and may reduce the resilience of exploited stocks, although climate change may also increase productivity in some cases. Fisheries production depends on primary production, but to date we have low confidence...

  8. Managing Small-scale Fisheries

    International Development Research Centre (IDRC) Digital Library (Canada)

    However, a glance through current fisheries literature reveals a perplexing array of perspectives and prescriptions to achieve this goal. There are few simple solutions for the problems that fisheries science and management address anywhere in the world. This is particularly so for small-scale fisheries, which this book is ...

  9. African Journals Online: Fish & Fisheries

    African Journals Online (AJOL)

    Today the membership of the society has expanded cutting across all the related disciplines including fisheries scientists, fishing companies and professional industrial fishing/fish farming enthusiasts and entrepreneurs. The Nigerian Journal of Fisheries is aimed at encouraging needed research into multivariate fisheries ...

  10. 75 FR 51683 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2010-08-23

    ... States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the Directed Butterfish Fishery..., Squid, and Butterfish Fishery Management Plan (FMP). The procedures for setting the annual initial...

  11. STATE SUPPORT IN FISHERY

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2004-06-01

    Full Text Available By passing the law on state support in agriculture, fishery and forestry the former support system has been changed. Fishery support beneficiaries can use several kinds of support and help. Former financial stimulations for fishery regulated by law from 1995 to 1st January 2003 were settled by the production stimulation model. Besides that well received model, there are the capital investment model, the support in production insurance, the right to use blue diesel, and granting credit for production of freshwater and saltwater fry, adult fish and shells. These five models of support and help can be used by freshwater and saltwater fish and shell breeders, while for fishing the marine fish the production stimulation model is applied (fishing of small pelagic fish, as well as the capital investment model and right to use blue diesel. Marine and freshwater processors can use the production stimulation and the capital investment model. All these models have in common the fact that all physical and legal entities registered for fishing activities (having licence for commercial fishery, aquaculture (the licence for aquaculture or the one for fish and other marine organisam breeding and processing (having the regulated veterinarian and sanitary conditions, the registration document and having been registered in the List of approved facilities have the right to use them.

  12. Hambantota Fishery Harbour

    NARCIS (Netherlands)

    Everts, P.S.; Julianus, E.J.B.; Marijnissen, M.; Voorend, S.J.M.

    2014-01-01

    At the southern coast of Sri Lanka a small fishery harbour is located in Hambantota. Soon after construction of the harbour in 2006 the harbour started silting up at various places. From that point onwards the harbour’s basin has been dredged multiple times, but the problem turned out to be

  13. CROATIAN FISHERIES IN 2005

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2006-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2005. there have been noticed slight production increase (both warmwater and coldwater fish species. The total freshwater fish production in 2005. was 6,199 tons (4,776 tons of warm–water species and 1,423 tons of cold–water species. Total areas and production areas were decreased comparing to 2004. (in all categories of production areas except for consum–fish production areas, where a slight increase has been noticed. Total catch of freshwater fish in 2005. was 656 tons. The total marine fish species production in 2005. was 3,000 tons, production of tuna 4,000 tons, mussels 2,500 tons and oysters 800,000 pieces. In mariculture sector there has been noticed the biggest increase in fish–fry production (43.39% comparing to 2004., in 2005. it was 10,000,000 pieces. The catch of marine fish was increased by 8.50% comparing to 2004. (increase was noticed for white and blue fish species. During 2005. there were no significant changes regarding the number of commercial fishermen comparing to the last two years, while the number of small–scale fishermen decreased 3.80% comparing to the last year. The total production of fish products in 2005. as 16,945 tons, which is 31.65% more comparing to 2004. In this sector the most significant is the increase of salted fish production, which was 56.11% more than 2004. The value of import in 2005. was higher than the value of export, which represents the only exception in last decade. The

  14. CROATIAN FISHERIES IN 2004

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2005-10-01

    Full Text Available This work deals with all the relevant statistic data regarding fisheries of Republic of Croatia, including freshwater fisheries data (aquaculture of fish and other aquatic organisms, commercial and sports fisheries, marine fisheries data (mariculture, commercial fisheries, small–scale fisheries and processing of fish and other marine organisms, as well as data about import and export of fish and fish products and the data about financial subventions in fisheries. Regarding aquaculture (freshwater fish farming in 2004 there have been noticed slight changes comparing to 2003. The total freshwater fish production in 2004 was 5,618 tons (4,259 tons of warm–water species and 1,359 tons of cold–water species. Total areas and production areas were increased comparing to 2003 (total areas 1.94% and production areas 5.42%. Total catch of freshwater fish in 2004 was 567 tons. The total marine fish species production was increased cca. 20% comparing to 2003. Mussels farming, which is slightly increasing since 1999, during 2004 was decreased, while oysters farming were stagnating. The catch of marine fish was increased by 9.74% comparing to 2003. The biggest increase is noticed regarding catch of demersal and other fish species. As well as the increase of the total catch, the number of commercial fishermen and fishing vessels was also increased in 2003. The number of fishermen who fish for their own consumption (without the right to sell fish–small scale fishermen in 2004 was 13,700. The total production of fish products in 2004 was 14,270 tons, which is 24.89% less comparing to 2003. Along this decrease, there has been also noticed an increasing trend of the production assortments, specially salted anchovy. The value of import in 2004 was higher than the value of export, although the export/import balance was higher in amount on the import side. Financial subventions payments in 2004 were 67.21% higher comparing to the first year of payments (1997

  15. 75 FR 9158 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Coastal Sharks Fishery

    Science.gov (United States)

    2010-03-01

    ... National Oceanic and Atmospheric Administration RIN 0648-XU54 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Coastal Sharks Fishery AGENCY: National Marine Fisheries Service (NMFS), National.... SUMMARY: NMFS announces that on February 4, 2010, the Atlantic States Marine Fisheries Commission...

  16. An environmental forensic approach for tropical estuaries based on metal bioaccumulation in tissues of Callinectes danae.

    Science.gov (United States)

    Bordon, Isabella C A C; Sarkis, Jorge E S; Andrade, Nathalia P; Hortellani, Marcos A; Favaro, Deborah I T; Kakazu, Mauricio H; Cotrim, Marycel E B; Lavradas, Raquel T; Moreira, Isabel; Saint'Pierre, Tatiana D; Hauser-Davis, Rachel Ann

    2016-01-01

    The blue crab Callinectes danae is distributed throughout the Atlantic coast and this study aimed to evaluate a environmental forensics approach that could be applied at tropical estuarine systems where this species is distributed, based on the metal concentrations in its tissues. For this purpose, blue crab samples were collected in 9 sites (distributed in 3 areas) along the Santos Estuarine System, state of São Paulo, Brazil. The concentrations of Al, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb and Zn were determined in gills, hepatopancreas and muscle tissues. Sediment samples were collected and analyzed in these same sites. A data distribution pattern was identified during both sampling periods (August and December 2011). In order to validate this model, a new sampling campaign was performed in March 2013 at the Santos Estuarine System and also at Ilha Grande (state of Rio de Janeiro). These data were added to the previous database (composed of the August and December 2011 samples) and a discriminant analysis was applied. The results confirmed an environmental fingerprint for the Santos Estuarine System.

  17. Contractions induced by sodium withdrawal in crab (Callinectes danae) muscle fibres.

    Science.gov (United States)

    Madeira, A C; Suarez-Kurtz, G

    1983-05-01

    A study was made of the effects of Na removal on the resting tension of single muscle fibres of the crab Callinectes danae. Reduction of [Na]o (replacement with Li, Tris or choline) below a threshold value, typical for each fibre, induced spontaneous, local contractions randomly dispersed along the fibres; this was followed by propagated contractile waves and tension oscillations. Sustained contractures were occasionally seen at threshold [Na]o and were consistently observed when [Na]o was further reduced. The Na withdrawal contractions depended on [Ca]o and were abolished in Ca-free media; they were restored within seconds after the addition of Ca (3-12 mM) or Sr (15-25 mM), but not Ba (10-100 mM), to the media. Caffeine (0.2-1.0 mM) facilitated, whereas La (2-5 mM), procaine (1 mM) or lidocaine (10 mM) inhibited the Na-withdrawal contractions. It is concluded that increased Ca influx across the sarcolemma and release of stored Ca from the sarcoplasmic reticulum are involved in the contractions induced by Na-deficient solutions in crab fibres.

  18. Juvenile development of Callinectes danae Smith, 1869 (Crustacea, Decapoda, Brachyura, Portunidae under laboratory conditions

    Directory of Open Access Journals (Sweden)

    EDUARDO A. BOLLA Jr

    2014-03-01

    Full Text Available The juvenile development of Callinectes danae was investigated from megalopae obtained in neuston samples at Ubatuba, São Paulo, Brazil. The individuals were raised in the laboratory under constant temperature (25 ± 1°C, filtered sea water from the collection location (35‰, and natural photoperiod. Newly hatched Artemia sp. nauplii were offered as food on a daily basis and ornamental-fish food was also provided for the juveniles from the 4th stage on. Twelve stages of the juvenile phase were obtained. The main morphological features that allowed recognition of the first juvenile stage were drawn and described. All the subsequent stages obtained were examined and measured, and the main changes in relation to the first stage were recorded. Sexual dimorphism becomes apparent from the fourth juvenile stage onwards. Some appendages and morphological features proved to be of great importance in the identification of species, including the number of segments of the antennal flagellum and the number of setae on the maxilla and on the 1st, 2nd and 3rd maxillipeds. These can probably be used for future comparisons and species identifications.

  19. Juvenile development of Callinectes danae Smith, 1869 (Crustacea, Decapoda, Brachyura, Portunidae) under laboratory conditions.

    Science.gov (United States)

    Bolla, Eduardo A; Fransozo, Vivian; Negreiros-Fransozo, Maria Lucia

    2014-03-01

    The juvenile development of Callinectes danae was investigated from megalopae obtained in neuston samples at Ubatuba, São Paulo, Brazil. The individuals were raised in the laboratory under constant temperature (25 ± 1°C), filtered sea water from the collection location (35‰), and natural photoperiod. Newly hatched Artemia sp. nauplii were offered as food on a daily basis and ornamental-fish food was also provided for the juveniles from the 4th stage on. Twelve stages of the juvenile phase were obtained. The main morphological features that allowed recognition of the first juvenile stage were drawn and described. All the subsequent stages obtained were examined and measured, and the main changes in relation to the first stage were recorded. Sexual dimorphism becomes apparent from the fourth juvenile stage onwards. Some appendages and morphological features proved to be of great importance in the identification of species, including the number of segments of the antennal flagellum and the number of setae on the maxilla and on the 1st, 2nd and 3rd maxillipeds. These can probably be used for future comparisons and species identifications.

  20. Population ecology of the blue crab Callinectes danae (Crustacea: Portunidae) in a Brazilian tropical estuary.

    Science.gov (United States)

    Araújo, Marina S L C; Barreto, Aline V; Negromonte, Aurinete O; Schwamborn, Ralf

    2012-03-01

    This paper aims at describing the population ecology of the swimming crab Callinectes danae Smith, 1869 in one of the most productive estuaries of Brazil, the Santa Cruz Channel. These crabs were monthly collected from January to December/2009 at four stations along the channel, two in the upper and two in the lower estuary. A total of 2373 specimens of C. danae were collected during the study. Males had a larger average carapace width than non-ovigerous females (60.0 ± 15.6 mm and 52.9 ± 12.4 mm, respectively), an adaptation that gives greater protection for females during the copulation. Overall sex ratio did not differ significantly from 1:1. However, evaluating sex-ratio by sampling area, males and juveniles of both sexes occurred preferentially in the upper estuary (p < 0.05), while adult females, including ovigerous, inhabited the lower estuary, an area of major marine influence (p < 0.05). While juveniles look for estuarine waters due to the benefit from the shelter and abundance of food, ovigerous females migrate to areas of greater depth and higher salinity in order to provide a more favorable environment for embryonic and larval development and to enhance larval dispersal. Recruitment of juveniles was continuous along the year, but intensified from March to June and, with less intensity, from October to December.

  1. Development of the male reproductive system in Callinectes ornatus Ordway, 1863 (Brachyura: Portunidae

    Directory of Open Access Journals (Sweden)

    Fabiana Aparecida do Nascimento

    Full Text Available This study describes the histology and histochemistry of the male reproductive system in Callinectes ornatus, comparing juvenile and adult developmental stages. We also analyzed changes in the gonadosomatic (GSI and hepatosomatic (HSI indices, and the weights of the testis and vas deferens during the development. The results showed that all stages, beginning with the juvenile (JUV, through developing (DEV and mature (MAT adult males of C. ornatus produce sperm and spermatophores. During development, testicular lobes showed the same characteristics of production and release of sperm into the seminiferous duct. The vas deferens showed little histological and histochemical change in the epithelium in juvenile and adult males. The differences consisted of the larger amount of secretion in MAT males compared to JUV and DEV ones. The chemical composition of the seminal fluid was similar, but MAT males produced a more homogeneous secretion. Morphological and physiological maturation are not synchronized in C. ornatus, since JUV males produced spermatophores similar to those in DEV and MAT males. However, these JUV are not yet able to reproduce, since they still have the abdomen attached to the cephalothoracic sternum. The increase of the GSI during development was significant for MAT males, and is related to the production of sufficient volume of seminal fluid to form the sperm "plug" in the female seminal receptacle. The HSI decreased from DEV to MAT adult stages, indicating that reserves from the hepatopancreas are used to develop the reproductive system after the pubertal molt.

  2. 50 CFR 259.32 - Conditional fisheries.

    Science.gov (United States)

    2010-10-01

    ... acquisition and/or reconstruction of a used vessel for operation in an adopted conditional fishery shall not... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Conditional fisheries. 259.32 Section 259.32 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC...

  3. 77 FR 3233 - Marine Fisheries Advisory Committee

    Science.gov (United States)

    2012-01-23

    ... RIN 0648-XA949 Marine Fisheries Advisory Committee AGENCY: National Marine Fisheries Service (NMFS... Fisheries Advisory Committee (MAFAC). The members will discuss and provide advice on issues outlined in the... Fisheries, National Marine Fisheries Service. [FR Doc. 2012-1263 Filed 1-20-12; 8:45 am] BILLING CODE 3510...

  4. 50 CFR 679.6 - Exempted fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Exempted fisheries. 679.6 Section 679.6 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OF THE EXCLUSIVE ECONOMIC ZONE OFF ALASKA General § 679.6...

  5. 50 CFR 600.110 - Intercouncil fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Intercouncil fisheries. 600.110 Section 600.110 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MAGNUSON-STEVENS ACT PROVISIONS Regional Fishery Management Councils § 600...

  6. 76 FR 10524 - Hawaii Bottomfish and Seamount Groundfish Fisheries; Fishery Closure

    Science.gov (United States)

    2011-02-25

    ... Seamount Groundfish Fisheries; Fishery Closure AGENCY: National Marine Fisheries Service (NMFS), National... closing the commercial and non-commercial fisheries in the main Hawaiian Islands ] fishery for seven... INFORMATION CONTACT: Jarad Makaiau, Sustainable Fisheries Division, NMFS Pacific Islands Region, 808-944-2108...

  7. Bycatch in marine fisheries

    OpenAIRE

    Ward, John M.; Benaka, Lee R.; Moore, Christopher M.; Meyers, Steve

    2012-01-01

    A review of the significant contributions in the peer-reviewed literature indicates that the discarding of marine fish known as bycatch remains one of the most significant problem facing fisheries managers. Bycatch has negative affects on marine biodiversity, is ripe with ethical and moral issues surrounding the waste of life from increased juvenile fish mortality, hinders commercial profitability and recreational satisfaction, increases management costs, and results in socio-cultural problem...

  8. Green growth in fisheries

    DEFF Research Database (Denmark)

    Nielsen, Max; Ravensbeck, Lars; Nielsen, Rasmus

    2014-01-01

    Climate change and economic growth have gained a substantial amount of attention over the last decade. Hence, in order to unite the two fields of interest, the concept of green growth has evolved. The concept of green growth focuses on how to achieve growth in environment-dependent sectors, witho......, investing in the rebuilding of fish stocks and a coordinated regulation of marine activities that interact with fisheries. Incentive-based regulation of fisheries that counterbalances services of the ecosystems is an important instrument to achieve green growth.......Climate change and economic growth have gained a substantial amount of attention over the last decade. Hence, in order to unite the two fields of interest, the concept of green growth has evolved. The concept of green growth focuses on how to achieve growth in environment-dependent sectors, without...... harming the environment. Fishery is an environment-dependent sector and it has been argued that there is no potential for green growth in the sector owing to global overexploitation, leaving no scope for production growth. The purpose of this paper is to explain what green growth is and to develop...

  9. Population ecology of the blue crab Callinectes danae (Crustacea: Portunidae in a Brazilian tropical estuary

    Directory of Open Access Journals (Sweden)

    Marina S.L.C. Araújo

    2012-03-01

    Full Text Available This paper aims at describing the population ecology of the swimming crab Callinectes danae Smith, 1869 in one of the most productive estuaries of Brazil, the Santa Cruz Channel. These crabs were monthly collected from January to December/2009 at four stations along the channel, two in the upper and two in the lower estuary. A total of 2373 specimens of C. danae were collected during the study. Males had a larger average carapace width than non-ovigerous females (60.0 ± 15.6 mm and 52.9 ± 12.4 mm, respectively, an adaptation that gives greater protection for females during the copulation. Overall sex ratio did not differ significantly from 1:1. However, evaluating sex-ratio by sampling area, males and juveniles of both sexes occurred preferentially in the upper estuary (p O presente trabalho tem por objetivo descrever a estrutura populacional do siri Callinectes danae Smith, 1869 em um dos estuários mais produtivos do Brasil, o Canal de Santa Cruz. As coletas foram realizadas mensalmente de Janeiro a Dezembro/ 2009 em quatro estações ao longo do canal, duas no estuário superior e duas no estuário inferior. Um total de 2373 exemplares de C. danae foi coletado. Os machos apresentaram média de largura de carapaça superior à das fêmeas não-ovígeras (60,0 ± 15,6 mm e 5,9 ± 12,4 mm, respectivamente, uma adaptação que confere maior proteção às fêmeas durante a cópula. A proporção sexual total não diferiu significativamente de 1:1. Porém, avaliando a 'sex-ratio' por área de coleta, os machos e os juvenis residem preferencialmente no estuário superior (p < 0, 05, enquanto as fêmeas adultas e ovígeras habitam no estuário inferior, área de maior influência marinha (p < 0, 05. Enquanto os juvenis procuram águas estuarinas devido a abundância de abrigos e comida, as fêmeas ovígeras migram para áreas de maior profundidade e maior salinidade visando prover um ambiente mais favorável ao desenvolvimento embrionário e

  10. African Journals Online: Fish & Fisheries

    African Journals Online (AJOL)

    They may take the form of a paper, a critical review or a short communication. ... The Fisheries society of Nigeria (FISON) was founded in 1976 by some few civil service based enthusiasts to promote the development of the fisheries profession and related disciplines in Nigeria, Africa and internationally. Today the ...

  11. Demand analysis for Nigerian fisheries

    OpenAIRE

    Okpanefe, M.O.

    1983-01-01

    This paper reviews available past fisheries statistics data and examines the basis of derivation of the estimates and concludes that much needs to be done to establish reliable fisheries data based on well defined methodology. Subsequently, fish consumption data for the ten-year-period 1971-1979 were related to the yearly population that consumes the fish

  12. Archives: Nigerian Journal of Fisheries

    African Journals Online (AJOL)

    Archives: Nigerian Journal of Fisheries. Journal Home > Archives: Nigerian Journal of Fisheries. Log in or Register to get access to full text downloads. Username, Password, Remember me, or Register · Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives. 1 - 3 of 3 Items. 2008. Vol 5, No 2 ...

  13. Fisheries Information Network in Indonesia.

    Science.gov (United States)

    Balachandran, Sarojini

    During the early 1980s the Indonesian government made a policy decision to develop fisheries as an important sector of the national economy. In doing so, it recognized the need for the collection and dissemination of fisheries research information not only for the scientists themselves, but also for the ultimate transfer of technology through…

  14. CROATIAN FRESHWATER FISHERY

    Directory of Open Access Journals (Sweden)

    Višnja Knjaz

    2007-07-01

    Full Text Available The basic characteristics of freshwater fishery in Croatia are predominantly negative trend in the past twenty years. Even though the total fish pond area covers more than 12,000 hectares, only 6,200 hectares of carp ponds and 58,700 m2 of trout ponds have been exploited. In 2006 the production of total freshwater fish reached 6,547 tons, out of which the production of consumable fish amounted to 5,067 tons and the juveniles 1,480 tons. The export of freshwater fish to EU countries, Macedonia, Bosnia and Herzegovina, Serbia and Monte Negro shows the positive trend and the Republic of Croatia continuously records a foreign trade surplus (987,000 US$. It must be pointed out, though, that the import of trout from Bosnia and Herzegovina significantly increased in the past three years which resulted in the decrease of the foreign trade surplus in that sector. The freshwater fishery in Croatia has been overly burdened by many problems

  15. Accumulation of contaminants from urban rainfall runoff in blue crabs: A pilot study

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The objective of this pilot study was to determine the feasibility of using caged blue crabs Callinectes sapidus to monitor accumulation of contaminants in urban...

  16. Alteration of Motor Network Function Following Injury

    Science.gov (United States)

    2013-10-01

    compared across multiple invertebrate and vertebrate species, including Lymnaea stagnalis, Drosophila melano- gaster, Apis mellifera , Daphnia pulex... Feed - back from peripheral musculature to central pattern generator in the neurogenic heart of the crab Callinectes sapidus: role of mechanosensitive

  17. Browse Title Index

    African Journals Online (AJOL)

    Callinectes sapidus) from Contaminated Site, Abstract PDF. IA Ololade, L lajide, IA Amoo. Vol 7, No 2 (2003), Oil Spill Pollution Treatment by Sorption on Natural Cynanchum Acutum L. Plant, Abstract PDF. S.A. SAYED ...

  18. 78 FR 51097 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2013-08-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XC783 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is...

  19. 76 FR 58720 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2011-09-22

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XA709 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is limited to...

  20. 75 FR 42610 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-07-22

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XX54 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is...

  1. 75 FR 33733 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-06-15

    ... Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION... as part of the live bait fishery or incidental to other fisheries; the incidental harvest of Pacific...

  2. 76 FR 40836 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2011-07-12

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XA554 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is...

  3. 75 FR 59156 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2010-09-27

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XY79 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is limited to...

  4. 77 FR 50952 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure

    Science.gov (United States)

    2012-08-23

    ... National Oceanic and Atmospheric Administration 50 CFR Part 660 RIN 0648-XC166 Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Closure AGENCY: National Marine Fisheries Service (NMFS... live bait fishery or incidental to other fisheries; the incidental harvest of Pacific sardine is...

  5. 46 CFR 67.21 - Fishery endorsement.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 2 2010-10-01 2010-10-01 false Fishery endorsement. 67.21 Section 67.21 Shipping COAST... DOCUMENTATION OF VESSELS Forms of Documentation; Endorsements; Eligibility of Vessel § 67.21 Fishery endorsement. (a) A fishery endorsement entitles a vessel to employment in the fisheries as defined in § 67.3...

  6. Structure and dynamics of fisheries in Nigeria

    Science.gov (United States)

    Nwafili Sylvanus, A.; Gao, Tianxiang

    2007-07-01

    The changes that have taken place in Nigerian fisheries are reviewed. Artisanal fishery has continued to dominate the fisheries, contributing over 85% of total fish production. The inland water and coastal seas are fully exploited and the increase in fishery production is not likely. Aquaculture potentials remain untapped as much as deep-sea fisheries. The combined potential of the fisheries resources-freshwater, marine and aquaculture can meet over 90% of the nation’s demand for fish. Opportunities for investments, therefore, exist in the various subsectors, especially in the areas of storage, processing and preservation for the capture fishery and fish seed multiplication for aquaculture.

  7. Hábito alimentar de Callinectes larvatus Ordway (Crustacea, Decapoda, Portunidae no Manguezal de Jiribatuba, Baía de Todos os Santos, Bahia Diet of Callinectes larvatus Ordway (Crustacea, Decapoda, Portunidae in the Jiribatuba Mangrove, Todos os Santos Bay, Bahia

    Directory of Open Access Journals (Sweden)

    César Roberto Goes Carqueija

    1998-01-01

    Full Text Available The diet of Callinectes larvatus Ordway, 1863 population which occupy the mangrove of Jiribatuba, Bahia, Brazil (13o03'25"S and 38o47'38"W is reported. The investigation of its stomachal contents showed that C. larvatus is an omnivorous species of ample feeding spectrum and presents detritivorous and opportunistic feeding strategy.

  8. Fisheries management: a manual for still-water coarse fisheries

    National Research Council Canada - National Science Library

    Girdler, A; Wellby, I; Welcomme, R

    2010-01-01

    ..., bacteria, plants, invertebrates, fish, disease-causing organisms, mammals and birds. Part two provides in-depth, cutting edge information on how a still-water fishery should be set up, developed and successfully managed...

  9. INTERNET IN FISHERIES

    Directory of Open Access Journals (Sweden)

    Daniel Matulić

    2006-01-01

    Full Text Available Internet is a global communication system interconnected with computer networks and intended to exchange the information of any kind. It is frequently called »network of all the networks« because it incorporates thousands and thousands of various computer networks all around the world and in order to communicate, has the same technical standards. The Internet has become an exclusive, unique source of information forever growing population. It has also become an ideal communication channel because of its dynamics, interaction, tractability and miraculously manageable updating of the content published. Nowadays, when fisheries starts playing and important role in Croatia, many people seek professional advice and guidance via Internet in order to fulfil their demanding professional tasks.

  10. Oyster Fisheries App

    Science.gov (United States)

    Perez Guerrero, Geraldo A.; Armstrong, Duane; Underwood, Lauren

    2015-01-01

    This project is creating a cloud-enabled, HTML 5 web application to help oyster fishermen and state agencies apply Earth science to improve the management of this important natural and economic resource. The Oyster Fisheries app gathers and analyzes environmental and water quality information, and alerts fishermen and resources managers about problems in oyster fishing waters. An intuitive interface based on Google Maps displays the geospatial information and provides familiar interactive controls to the users. Alerts can be tailored to notify users when conditions in specific leases or public fishing areas require attention. The app is hosted on the Amazon Web Services cloud. It is being developed and tested using some of the latest web development tools such as web components and Polymer.

  11. 78 FR 3401 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2013-01-16

    ...; Atlantic Mackerel, Squid, and Butterfish Fisheries; Scoping Process; Mid-Atlantic Fishery Management... support for an amendment (Amendment 16) to the Fishery Management Plan (FMP) for Atlantic Mackerel, Squid...

  12. Assessment of metal concentrations in muscles of the blue crab, Callinectes danae S., from the Santos Estuarine System.

    Science.gov (United States)

    Bordon, Isabella C A C; Sarkis, Jorge E S; Tomás, Acácio R G; Scalco, Allan; Lima, Mariana; Hortellani, Marcos A; Andrade, Nathalia P

    2012-09-01

    This study determined the concentrations of eleven metals in the blue crab, Callinectes danae, from nine sites in the Santos Estuarine System of Sao Paulo State, Brazil. The results were compared to guidelines established in the United States, Europe and Brazil for the safety of human consumers. Muscles of blue crabs were removed by dissection and concentrations of Al, Cd, Co, Cr, Cu, Fe, Hg, Mn Ni, Pb and Zn were determined. In general, the concentrations of metals were low, and the crabs were regarded as safe for human consumption. Crabs from a single site (site 4) exceeded the guidelines established by the United States and Europe, but not Brazil, for Pb, with a mean tissue concentration of 1.725 μg g(-1). With the exception of Al, Fe and Ni, significant differences were noted between sites in the concentrations of each metal in crab tissue.

  13. Anatomy of virgin and mature externae of Loxothylacus texanus, parasitic on the dark blue crab Callinectes rathbunae (Crustacea

    DEFF Research Database (Denmark)

    Alvarez, Fernando; Bortolini, José Luis; Høeg, Jens Thorvald

    2010-01-01

    the reproductive biology and the taxonomy of these specialized parasites. We use scanning electron microscopy and histological methods to study the anatomy of juvenile and the mature externae of the rhizocephalan barnacle Loxothylacus texanus parasitizing the blue crab Callinectes rathbunae. We put emphasis...... on the implantation of males and the histology of the female reproductive organs. In the virgin externae, male cyprids attach around a cuticular hood covering the mantle aperture, which is partially blocked by a plug of cuticle so only trichogon larvae, not cyprids, can access the mantle cavity. This resembles......, as is characteristic for the genus Loxothylacus. The internal anatomy of the mature externa of L. texanus is in most features similar to that seen in other species of the Sacculinidae, which comprises the majority of rhizocephalan species. However, the single receptacle creates a situation where the two implanted...

  14. Hoffman etal 2016 Fisheries Data

    Data.gov (United States)

    U.S. Environmental Protection Agency — Fish collection data associated with the data analysis presented in Hoffman et al. 2016. Fisheries 41(1):26-37, DOI: 10.1080/03632415.2015.1114926. This dataset is...

  15. Preliminary survey of a nemertean crab egg predator, Carcinonemertes, on its host crab, Callinectes arcuatus (Decapoda, Portunidae) from Golfo de Nicoya, Pacific Costa Rica

    Science.gov (United States)

    Okazaki, Robert K.; Wehrtmann, Ingo S.

    2014-01-01

    Abstract The possible presence of egg predators in brood masses of portunid crabs from Pacific Central America has not been studied yet. This survey reports the finding of a nemertean crab egg predator on the portunid crab, Callinectes arcuatus, from the Golfo de Nicoya, Pacific Costa Rica. Nemerteans were found in the egg masses of 26 out of the 74 crabs for a prevalence of 35%. The intensity (mean number of worms/ infected crab) was estimated to be 18 with a variance of 1–123 worms/infected crab. No nemerteans were observed either in the 19 Callinectes arcuatus from Golfo Dulce (southern Pacific coast) and the 10 Portunus asper from Herradura-Jaco (central Pacific coast). This nemertean is a member of the genus Carcinonemertes, which has been reported from the Caribbean coast of Panama. However, the encountered Carcinonemertes sp. is the first published finding and report from Costa Rica and Pacific Central America. PMID:25561848

  16. 76 FR 74724 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2011-12-01

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Amendment 11 AGENCY: National Marine... implementing Amendment 11 to the Atlantic Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan (FMP...

  17. 76 FR 39313 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2011-07-06

    ... Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the Directed... under the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan (FMP). The procedures for...

  18. Acoustic telemetry and fisheries management

    Science.gov (United States)

    Crossin, Glenn T.; Heupel, Michelle R.; Holbrook, Christopher; Hussey, Nigel E.; Lowerre-Barbieri, Susan K; Nguyen, Vivian M.; Raby, Graham D.; Cooke, Steven J.

    2017-01-01

    This paper reviews the use of acoustic telemetry as a tool for addressing issues in fisheries management, and serves as the lead to the special Feature Issue of Ecological Applications titled “Acoustic Telemetry and Fisheries Management”. Specifically, we provide an overview of the ways in which acoustic telemetry can be used to inform issues central to the ecology, conservation, and management of exploited and/or imperiled fish species. Despite great strides in this area in recent years, there are comparatively few examples where data have been applied directly to influence fisheries management and policy. We review the literature on this issue, identify the strengths and weaknesses of work done to date, and highlight knowledge gaps and difficulties in applying empirical fish telemetry studies to fisheries policy and practice. We then highlight the key areas of management and policy addressed, as well as the challenges that needed to be overcome to do this. We conclude with a set of recommendations about how researchers can, in consultation with stock assessment scientists and managers, formulate testable scientific questions to address and design future studies to generate data that can be used in a meaningful way by fisheries management and conservation practitioners. We also urge the involvement of relevant stakeholders (managers, fishers, conservation societies, etc.) early on in the process (i.e. in the co-creation of research projects), so that all priority questions and issues can be addressed effectively.

  19. 50 CFR 300.95 - Treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Treaty Indian fisheries. 300.95 Section 300.95 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Fraser River Sockeye and Pink Salmon Fisheries § 300.95 Treaty Indian fisheries. (a) Any treaty...

  20. 50 CFR 300.25 - Eastern Pacific fisheries management.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Eastern Pacific fisheries management. 300.25 Section 300.25 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Tuna Fisheries § 300.25 Eastern Pacific fisheries management. (a) Notification...

  1. Biodegradation of vegetable and agrowastes by Pleurotus sapidus: a novel strategy to produce mushroom with enhanced yield and nutrition.

    Science.gov (United States)

    Singh, M P; Singh, V K

    2012-12-22

    Edible oyster mushroom Pleurotus sapidus was cultivated, on pea pod shell, cauliflower leaves, radish leaves, brassica straw in various combinations of paddy straw. The mushroom failed to grow on these vegetable wastes separately. However, it grew very well on these vegetable wastes when mixed with various combinations of paddy straw as substrate. Total yield and biological efficiency of the mushroom cultivated on substrate containing 20% and 30% vegetable wastes mixed with 70% and 80% (w/w) of paddy straw was found to be better, when compared with yield and efficiency obtained with paddy straw alone (100%). The protein content in the fruit bodies was found to be higher in the mushroom grown on paddy straw mixed with vegetable wastes than that obtained with paddy straw alone. Similarly, six amino acids (Leu, Ile, Val, Thr, Met and Phe) showed a significant increase when the mushroom was grown on a mixed substrate containing both vegetable wastes and paddy straw. On the contrary, the total sugar and reducing sugar content declined in the mushroom grown on the mixture of paddy straw and other wastes, when compared with the results obtained with paddy straw alone.

  2. 77 FR 25097 - Fisheries of the Northeastern United States; 2012-2013 Northeast Skate Complex Fishery...

    Science.gov (United States)

    2012-04-27

    ... United States; 2012-2013 Northeast Skate Complex Fishery Specifications AGENCY: National Marine Fisheries.... SUMMARY: This rule implements catch limits and associated measures for the Northeast skate complex fishery... Council pursuant to the provisions of the Northeast Skate Complex Fishery Management Plan. The catch...

  3. 76 FR 11857 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2011-03-03

    ..., offshore hake, and ocean pout; while large- mesh species include Atlantic cod, haddock, yellowtail flounder...- Stock Total ACL ACL Scallop fishery herring fishery sub-component components GB cod 4,540 4,301 0 0 48... Scallop fishery herring fishery sub-component components GB cod 5,109 4,841 0 0 54 215 GB haddock 27,637...

  4. 75 FR 32745 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2010-06-09

    ...; Atlantic Mackerel, Squid, and Butterfish Fisheries; Scoping Process AGENCY: National Marine Fisheries...) for Atlantic Mackerel, Squid, and Butterfish (MSB) and to prepare an EIS to analyze the impacts of any... implementation of catch share systems for the squid fisheries; the need for additional fishery monitoring to...

  5. 78 FR 45896 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure...

    Science.gov (United States)

    2013-07-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC782 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  6. 78 FR 64182 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2013-10-28

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC921 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS... FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224. SUPPLEMENTARY...

  7. 78 FR 76759 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure...

    Science.gov (United States)

    2013-12-19

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XD024 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trimester Closure for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  8. 75 FR 12141 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2010-03-15

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-AY01 Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Monkfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  9. 77 FR 58969 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2012-09-25

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC235 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS..., 2012. FOR FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224...

  10. 78 FR 54399 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2013-09-04

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC815 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS... December 31, 2013. FOR FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224...

  11. 75 FR 74005 - Fisheries of the Northeastern United States; Monkfish Fishery; Scoping Process

    Science.gov (United States)

    2010-11-30

    ... National Oceanic and Atmospheric Administration RIN 0648-BA50 Fisheries of the Northeastern United States; Monkfish Fishery; Scoping Process AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... statement (EIS) and scoping meetings; request for comments. SUMMARY: The New England Fishery Management...

  12. 76 FR 71501 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery

    Science.gov (United States)

    2011-11-18

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-BA56 Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service... into the lobster trap fishery in Lobster Conservation Management Area 1 (Federal inshore waters-Gulf of...

  13. 75 FR 33242 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery

    Science.gov (United States)

    2010-06-11

    ... National Oceanic and Atmospheric Administration RIN 0648-XW45 Atlantic Coastal Fisheries Cooperative Management Act Provisions; Weakfish Fishery AGENCY: National Marine Fisheries Service (NMFS), National.... SUMMARY: On May 6, 2010, the Atlantic States Marine Fisheries Commission (Commission) found the State of...

  14. 76 FR 74009 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2011-11-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA825 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS...: Carly Bari, Fishery Management Specialist, (978) 281-9224. SUPPLEMENTARY INFORMATION: Regulations...

  15. 78 FR 54194 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit...

    Science.gov (United States)

    2013-09-03

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC823 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Adjustments for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  16. 75 FR 3416 - Fisheries in the Western Pacific; Pelagic Fisheries; Vessel Identification Requirements

    Science.gov (United States)

    2010-01-21

    ... National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-AX38 Fisheries in the Western Pacific; Pelagic Fisheries; Vessel Identification Requirements AGENCY: National Marine Fisheries Service... INFORMATION CONTACT: Jarad Makaiau, Sustainable Fisheries, NMFS PIR, 808-944-2108. SUPPLEMENTARY INFORMATION...

  17. 75 FR 48874 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications

    Science.gov (United States)

    2010-08-12

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-AY14 Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications AGENCY: National Marine Fisheries Service (NMFS... announces final specifications for the 2010-2012 fishing years for the Atlantic herring (herring) fishery...

  18. KB WOT Fisheries 2018: maintaining excellence and innovation in fisheries research

    NARCIS (Netherlands)

    Damme, van C.J.G.; Verver, S.W.

    2017-01-01

    The KB WOT Fisheries programme is developed to maintain and develop expertise needed to carry out the Dutch statutory obligations in fisheries monitoring and advice. The KB WOT Fisheries programme developed for 2018 reflects the scientific and management needs of the WOT fisheries programme. The

  19. 77 FR 22678 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-04-17

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648- XB145 Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the Trimester 1 Longfin Squid Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric...

  20. 78 FR 51131 - Fisheries of the Northeastern United States; Atlantic Coastal Fisheries Cooperative Management...

    Science.gov (United States)

    2013-08-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-BD45 Fisheries of the Northeastern United States; Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  1. 77 FR 76424 - Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer

    Science.gov (United States)

    2012-12-28

    ... Administration 50 CFR Part 648 [Docket No. 120201086-2418-02] RIN 0648-XC394 Fisheries of the Northeastern United States; Bluefish Fishery; Quota Transfer AGENCY: National Marine Fisheries Service (NMFS), National... FURTHER INFORMATION CONTACT: Carly Bari, Fishery Management Specialist, 978-281-9224. SUPPLEMENTARY...

  2. 75 FR 20550 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications

    Science.gov (United States)

    2010-04-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-AY14 Fisheries of the Northeastern United States; Atlantic Herring Fishery; Specifications AGENCY: National Marine Fisheries Service (NMFS... comments. SUMMARY: NMFS proposes 2010-2012 specifications for the Atlantic herring (herring) fishery. These...

  3. 77 FR 32420 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery

    Science.gov (United States)

    2012-06-01

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-BA56 Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service... into the lobster trap fishery in Lobster Conservation Management Area 1 (Area 1), located in the...

  4. 78 FR 35217 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery

    Science.gov (United States)

    2013-06-12

    ... National Oceanic and Atmospheric Administration 50 CFR Part 697 RIN 0648-AT31 Atlantic Coastal Fisheries Cooperative Management Act Provisions; American Lobster Fishery AGENCY: National Marine Fisheries Service... lobster trap fishing effort by limiting access into the lobster trap fishery in Lobster Conservation...

  5. 75 FR 81505 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2010-12-28

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BA42 Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Tilefish Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  6. 75 FR 57249 - Fisheries of the Northeastern United States; Northeast (NE) Multispecies Fishery; Charter/Party...

    Science.gov (United States)

    2010-09-20

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BA09 Fisheries of the Northeastern United States; Northeast (NE) Multispecies Fishery; Charter/Party Fishery Control Date AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION...

  7. 76 FR 53832 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Decrease...

    Science.gov (United States)

    2011-08-30

    ... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA652 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Decrease for the Common Pool Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA...

  8. Magnuson-Stevens Fishery Conservation Act

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Magnuson-Stevens Fishery Conservation and Management Act (MSA) is the primary law governing marine fisheries management in U.S. federal waters. It has since been...

  9. Handbook of Fish Biology and Fisheries

    National Research Council Canada - National Science Library

    Hart, Paul J.B; Reynolds, John D

    2002-01-01

    ... behaviour and community ecology. The second volume, "Fisheries", uses much of this information in a wide-ranging review of fisheries biology, including methods of capture, marketing, economics, stock assessment, forecasting, eco...

  10. Fisheries Management Plan : Muscatatuck National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Fisheries Management Plan for Muscatatuck NWR provides an introduction to the Refuge, summarizes the relationship of fishery management to Refuge objectives,...

  11. Fishery Management Plan : Tamarac National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Fishery Management Plan for Tamarac NWR provides an inventory of fishery resources on the Refuge including a description of the water area and fish sampling...

  12. Technological development in fisheries management

    DEFF Research Database (Denmark)

    Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik

    2014-01-01

    increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of technological creep improves the basis for successfully integrating the effects of technological development (and catchability changes) in fisheries...... management regulations and policies. Ways of counteracting the undesired effects of technological creep are discussed as are the potential management benefits from improved fishing technology. Specific suggestions are given on the selection, application, and tuning of fisheries management tools that can......Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism...

  13. Increased competition for aquaculture from fisheries

    DEFF Research Database (Denmark)

    Jensen, Frank; Nielsen, Max; Nielsen, Rasmus

    2014-01-01

    ; and supplies from aquaculture have grown continuously. In this paper, the impact of improved fisheries management on aquaculture growth is studied assuming perfect substitution between farmed and wild fish. We find that improved fisheries management, ceteris paribus, reduces the growth potential of global...... aquaculture in markets where wild fisheries constitute a large share of total supply....

  14. Is the Dutch shrimp fishery sustainable?

    NARCIS (Netherlands)

    Welleman, H.C.; Daan, N.

    2001-01-01

    The fishery of the brown shrimp (Crangon crangon LINNEAUS 1758) is a widespread human activity in the coastal zone. Yet management of this fishery has never been implemented. The question is raised whether an uncontrolled fishery is sustainable or the conceivable ecological stress results in

  15. Trust and new modes of fisheries governance

    NARCIS (Netherlands)

    Vos, de B.I.

    2011-01-01

     It is a commonplace today that many of the world’s commercial fisheries are in a state of crisis. As a response to the state of fisheries management, a large array of governance innovations has been deployed over the past two decades in many fisheries industries worldwide. In these new

  16. 75 FR 44770 - Marine Fisheries Advisory Committee

    Science.gov (United States)

    2010-07-29

    ... National Oceanic and Atmospheric Administration RIN 0648-XX87 Marine Fisheries Advisory Committee AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... of a forthcoming meeting of the Marine Fisheries Advisory Committee (MAFAC). The members will discuss...

  17. 19 CFR 4.96 - Fisheries.

    Science.gov (United States)

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Fisheries. 4.96 Section 4.96 Customs Duties U.S... FOREIGN AND DOMESTIC TRADES General § 4.96 Fisheries. (a) As used in this section: (1) The term... engaged only in the North Pacific halibut fishery and which is therefore entitled to the privileges...

  18. 77 FR 46733 - Marine Fisheries Advisory Committee

    Science.gov (United States)

    2012-08-06

    ... National Oceanic and Atmospheric Administration RIN 0648-XC145 Marine Fisheries Advisory Committee AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... of a forthcoming meeting of the Marine Fisheries Advisory Committee (MAFAC). The members will discuss...

  19. 76 FR 14379 - Marine Fisheries Advisory Committee

    Science.gov (United States)

    2011-03-16

    ... National Oceanic and Atmospheric Administration RIN 0648-XA265 Marine Fisheries Advisory Committee AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... of a forthcoming meeting of the Marine Fisheries Advisory Committee (MAFAC). The members will discuss...

  20. CROATIAN FISHERY IN 2003 YEAR

    Directory of Open Access Journals (Sweden)

    Irena Jahutka

    2004-12-01

    Full Text Available This work deals with the analysis and sublimation of all the relevant informations regarding fisheries in Republic of Croatia. This means that there were processed data about freshwater fisheries (farming of freshwater fish and other aquatic organisms, commercial and sports fisheries, marine fisheries (mariculture, commercial fisheries, small–scale fisheries and processing of fish products, import and export of fish and fish products as well as the financial subventions regarding fisheries. The farming of freshwater fish in 2003 is marked by the decrease of production comparing to the past 5 years. Carp is furthermore the most dominant fish species in freshwater fish farming, but it’s percentage is decreasing, and the percentage of the trout is increasing over the years. In addition to the decrease of production, the areas of production are decreasing as well, and now they are the smallest in the past decade — 6,281.97 ha. In 2003 the amount of used food is also decreased, but the amount of used fertilizers and lime is increased, that means it is the biggest in the past decade. This is caused by the bad climate conditions during the summer. Marine fisheries farming (mariculture in 2003 is in a slightly better position then the freshwater fish farming. The production of white fish species, which was reached before few years, is not changing — 2,510 tons, also the farming of oysters is stagnating, but in the past few years the farming of mussels and tuna fish is increasing. The total marine fish catch is 29,102 tons and it is performed over 34,000 km2, comparing to the 2002 it is increased by almost 49.24%. Additional to the increase of the total catch the number of commercial fishermen and fishing vessels is also increased. The number of fisherman which fish for their own consumption without the right to sell fish, that means the small–scale fishermen in 2003 is 13,500. The production of fish and fish products in 2003 is 19,000 tons

  1. The Traceability and Safety of Fishery Products

    Directory of Open Access Journals (Sweden)

    Gheorghe Adrian ZUGRAVU

    2012-12-01

    Full Text Available The paper follows two main objectives: to understand consumers’ perception of safety trasability and quality of fishery products and to identify communication levers in order to improve the perceived image of fishery products. The present research is focused on the fishery products, regardless of their presentation – fresh, frozen or processed. This paper conducted a questionnaire survey of Romanian consumers’ perception toward fishery products. The empirical study with brands indicated that consumers are different awareness to domestic and foreign safety fish products. National fishery products got more attention from the consumers.

  2. New modes of fisheries governance

    NARCIS (Netherlands)

    Vos, de B.I.; Döring, R.; Aranda, M.; Buisman, F.C.; Frangoudes, K.; Goti, L.; Macher, C.; Maravelias, C.D.; Murillas-Maza, A.; Valk, van der O.; Vasilakopoulos, P.

    2016-01-01

    Fisheries policy is increasingly influenced by civil society organizations. The newest example of this is the formulation of the landing obligation, a regulation that should reduce the contested practice of discarding unwanted fish. In this paper the implementation process of the landing

  3. Market-Based Fisheries Management

    DEFF Research Database (Denmark)

    Høst, Jeppe Engset

    This book reveals how a privatization of fish resources has paved the way for a wide-reaching concentration and change in ownership. It is a thought-provoking contribution to the debate on the future of European fisheries and the possible solutions to overfishing in Europe. Readers will discover ...

  4. Fisheries-induced disruptive selection.

    Science.gov (United States)

    Landi, Pietro; Hui, Cang; Dieckmann, Ulf

    2015-01-21

    Commercial harvesting is recognized to induce adaptive responses of life-history traits in fish populations, in particular by shifting the age and size at maturation through directional selection. In addition to such evolution of a target stock, the corresponding fishery itself may adapt, in terms of fishing policy, technological progress, fleet dynamics, and adaptive harvest. The aim of this study is to assess how the interplay between natural and artificial selection, in the simplest setting in which a fishery and a target stock coevolve, can lead to disruptive selection, which in turn may cause trait diversification. To this end, we build an eco-evolutionary model for a size-structured population, in which both the stock׳s maturation schedule and the fishery׳s harvest rate are adaptive, while fishing may be subject to a selective policy based on fish size and/or maturity stage. Using numerical bifurcation analysis, we study how the potential for disruptive selection changes with fishing policy, fishing mortality, harvest specialization, life-history tradeoffs associated with early maturation, and other demographic and environmental parameters. We report the following findings. First, fisheries-induced disruptive selection is readily caused by commonly used fishing policies, and occurs even for policies that are not specific for fish size or maturity, provided that the harvest is sufficiently adaptive and large individuals are targeted intensively. Second, disruptive selection is more likely in stocks in which the selective pressure for early maturation is naturally strong, provided life-history tradeoffs are sufficiently consequential. Third, when a fish stock is overexploited, fisheries targeting only large individuals might slightly increase sustainable yield by causing trait diversification (even though the resultant yield always remains lower than the maximum sustainable yield that could be obtained under low fishing mortality, without causing disruptive

  5. Small-scale fisheries in Greenlandic planning

    DEFF Research Database (Denmark)

    Jacobsen, Rikke Becker

    2013-01-01

    This article analyses an ongoing planning process in Greenlandic fisheries governance aiming to reform the coastal Greenland halibut fishery. It examines the way certain truths about this fishery and the need for reform are produced up to and in the final policy document ‘regulation concerning...... the coastal fishery for Greenland halibut’. Findings highlight the way the small-scale Greenland halibut fishery system becomes a particular governance problem with respect to particular contextual meanings of sustainability and long-term planning. The article then examines whether this governance problem...... could also be understood as primarily a problem to a certain ‘governmentality’ mode of governance. Whereas some fishery studies document how governmentality modes of governance in fisheries succeeds in transforming subjectivities, this study offers a view into the process that might go before successful...

  6. Physiological and behavioral effects of chemoreceptors located in different body parts of the swimming crab Callinectes danae.

    Science.gov (United States)

    Aggio, Juan F; de Freitas, José C

    2007-04-01

    By perfusing their branchial chambers with filtered seawater, we have developed a preparation that allows us to maintain the swimming crab Callinectes danae outside water without any major effects on its cardiac activity. This in turn allowed us to selectively stimulate chemoreceptors located in different body parts, and specifically to discriminate between the receptors located in the branchial chambers and those located in the oral region (mainly in the mouthparts, antennules and antennae). We show that a taurine solution can evoke bradycardia when applied to the oral region or to a combination of the oral region and the branchial chambers. Although the precise localization of the oral region receptors involved remains to be determined, ablation experiments show that the olfactory organs (i.e., the antennules) are not involved. Finally, we show that although stimulating the pereiopods has no effect on the animals' cardiac activity it causes the animals to move, putatively to try to grasp a piece of food, a reaction not evoked by stimulating the gills or the oral regions. Our results lend support to the idea that chemoreceptors located in different parts of the body play different functional roles in decapod crustaceans.

  7. Reproductive period of the swimming crab Callinectes danae at the Santa Cruz Channel, a highly productive tropical estuary in Brazil

    Directory of Open Access Journals (Sweden)

    Marina de Sá Leitão Câmara de Araújo

    Full Text Available The aim of this study was to analyze reproductive aspects of Callinectes danae in one of the most productive estuarine systems in the Northeast Brazil, Santa Cruz Channel. A total of 1.573 individuals, being 756 females (23 ovigerous and 817 males were examined from January to December 2009. Mature males and females, as well as couples of C. danae, occurred in all months of the year. Ovigerous females occurred in nearly all months. The reproductive activity, based on the macroscopic observation of the gonads, occurs continuously, with distinguishable peaks in February, March and September. Ovigerous females were only recorded nearest to the sea, while couples were only in the inner estuary. Thus, a migration pattern is proposed, with couples mating inside the estuary, followed by a migration of females to the area of greater marine influence for egg laying and, probably, larval release. After this, probably the females of do not return to the estuary, characterizing habitat partitioning. The present study is the first contribution on the reproductive period of C. danae in an estuarine ecosystem of the Brazilian northeast coast, and elucidates some aspects of its reproductive behavior.

  8. How fisheries management can benefit from genomics?

    Science.gov (United States)

    Valenzuela-Quiñonez, Fausto

    2016-09-01

    Fisheries genomics is an emerging field that advocates the application of genomic tools to address questions in fisheries management. Genomic approaches bring a new paradigm for fisheries management by making it possible to integrate adaptive diversity to understand fundamental aspects of fisheries resources. Hence, this review is focused on the relevance of genomic approaches to solve fisheries-specific questions. Particularly the detection of adaptive diversity (outlier loci) provides unprecedented opportunity to understand bio-complexity, increased power to trace processed sample origin to allow enforcement and the potential to understand the genetic basis of micro-evolutionary effects of fisheries-induced evolution and climate change. The understanding of adaptive diversity patterns will be the cornerstone of the future links between fisheries and genomics. These studies will help stakeholders anticipate the potential effects of fishing or climate change on the resilience of fisheries stocks; consequently, in the near future, fisheries sciences might integrate evolutionary principles with fisheries management. © The Author 2016. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oup.com.

  9. 50 CFR 665.260 - Hawaii precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Hawaii precious coral fisheries. 665.260 Section 665.260 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Hawaii...

  10. 50 CFR 665.240 - Hawaii crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Hawaii crustacean fisheries. 665.240 Section 665.240 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Hawaii...

  11. 50 CFR 665.660 - PRIA precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA precious coral fisheries. 665.660 Section 665.660 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific Remote...

  12. 50 CFR 665.440 - Mariana crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana crustacean fisheries. 665.440 Section 665.440 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Mariana...

  13. 50 CFR 665.400 - Mariana bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana bottomfish fisheries. 665.400 Section 665.400 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Mariana...

  14. 50 CFR 660.50 - Pacific Coast treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Pacific Coast treaty Indian fisheries. 660.50 Section 660.50 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OFF WEST COAST STATES West Coast...

  15. 50 CFR 665.460 - Mariana precious coral fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Mariana precious coral fisheries. 665.460 Section 665.460 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Mariana...

  16. 50 CFR 229.8 - Publication of List of Fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Publication of List of Fisheries. 229.8 Section 229.8 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES UNDER THE MARINE...

  17. 50 CFR 229.5 - Requirements for Category III fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Requirements for Category III fisheries. 229.5 Section 229.5 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES UNDER...

  18. 50 CFR 660.324 - Pacific Coast treaty Indian fisheries.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Pacific Coast treaty Indian fisheries. 660.324 Section 660.324 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES OFF WEST COAST STATES West Coast...

  19. 50 CFR 665.600 - PRIA bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA bottomfish fisheries. 665.600 Section 665.600 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific Remote Island Area...

  20. 50 CFR 665.100 - American Samoa bottomfish fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false American Samoa bottomfish fisheries. 665.100 Section 665.100 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC American Samoa...

  1. 50 CFR 665.140 - American Samoa Crustacean Fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false American Samoa Crustacean Fisheries. 665.140 Section 665.140 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC American Samoa...

  2. 50 CFR 229.11 - Confidential fisheries data.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Confidential fisheries data. 229.11 Section 229.11 Wildlife and Fisheries NATIONAL MARINE FISHERIES SERVICE, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MARINE MAMMALS AUTHORIZATION FOR COMMERCIAL FISHERIES UNDER THE MARINE...

  3. 50 CFR 665.640 - PRIA crustacean fisheries. [Reserved

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false PRIA crustacean fisheries. 665.640 Section 665.640 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE (CONTINUED) FISHERIES IN THE WESTERN PACIFIC Pacific Remote Island Area...

  4. Contractual Arrangements in Philippine Fisheries

    OpenAIRE

    Carnaje, Gideon P.

    2007-01-01

    Economists have begun the quest for explanations of contractual choices in developing countries and especially for pervasiveness of informal credit and insurance arrangements and interlinkages observed in agricultural and fishing contracts. In the case of fisheries, what is needed is an in-depth knowledge of real world contract provisions and categorization of contractual arrangements to guide analysis of contractual arrangements. This paper is a modest contribution toward this particular end...

  5. Solving complex fisheries management problems

    DEFF Research Database (Denmark)

    Petter Johnsen, Jahn; Eliasen, Søren Qvist

    2011-01-01

    A crucial issue for the new EU common fisheries policy is how to solve the discard problem. Through a study of the institutional set up and the arrangements for solving the discard problem in Denmark, the Faroe Islands, Iceland and Norway, the article identifies the discard problem as related...... to both natural, other material and to cultural conditions. Hence, solving the discard problem requires not only technical and regulatory instruments, but also arenas and structures that allow and facilitate processes of cultural change....

  6. 76 FR 59387 - Fisheries of the South Atlantic; South Atlantic Fishery Management Council; Public Meeting

    Science.gov (United States)

    2011-09-26

    ... Eco-Regional Partner Coordination meeting will be integrated with the AP meeting on November 16, 2011... Director, Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22-P ...

  7. Assimilating near-real-time fisheries and environmental data into an advanced fisheries management information system

    National Research Council Canada - National Science Library

    Brown, W.S; Bub, F.L; Rothschild, B; Sundermeyer, M; Gangopadhyay, A; Lane, R; Robinson, A.R; Haley, P

    2001-01-01

    Working under the hypothesis that more frequent information would help to imporve fisheries science and management practice, we have built a prototype operational advanced fisheries management information system (AFMIS...

  8. 78 FR 39121 - Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport and Commercial Fisheries in Alaska

    Science.gov (United States)

    2013-06-28

    ... Management of the Halibut Fisheries A. Regulatory Authority B. Background on the Halibut Fishery II. History... fishing privileges. II. History of Management in the Charter Halibut Fisheries This section provides an... for harvest in the charter fishery. This action is necessary to achieve the halibut fishery management...

  9. 76 FR 44155 - Pacific Halibut Fisheries; Catch Sharing Plan for Guided Sport and Commercial Fisheries in Alaska

    Science.gov (United States)

    2011-07-22

    ... Contents I. Management of the Halibut Fisheries II. History of Management in the Guided Sport Halibut... halibut fishery decreased. II. History of Management in the Guided Sport Halibut Fisheries Until 2007... halibut fishery management goals of the North Pacific Fishery Management Council. DATES: Written comments...

  10. State of global fisheries – management policies

    OpenAIRE

    Alicja Dabrowska; Lara D. Mateos

    2013-01-01

    Global fisheries landings have stagnated and are associated with many negative environmental impacts, affecting the economy and food security in many countries around the world. Although many different management policies trying to incorporate a more sustainable and resilient scope have been developed over the years to improve this current fisheries crisis, we are still in the early stages of adopting more adaptive and corrective fisheries management globally, as well as enforcing it, due to ...

  11. An Overview of Guam's Inshore Fisheries

    OpenAIRE

    Hensley, Rebecca A.; Sherwood, Timothy S.

    1993-01-01

    Guam's nearshore reef fishery is a multi-gear, multispecies fishery that has undergone major changes through the years. Methods have evolved and become more modern. This, along with the changing economic status of Guam, has severely stressed the fishery. Top targeted species are being overexploited and "growth overharvesting" is occurring; the more serious form of "recruitment overharvesting," is happening to some of the key species. Major management concerns are discussed with respect to ove...

  12. Sustainable Development and High Seas Fisheries

    Directory of Open Access Journals (Sweden)

    Otto Spijkers

    2013-01-01

    Full Text Available This article examines the role of the concept of sustainable development in the legal regime governing the exploitation of the natural resources of the oceans, particularly fisheries on the high seas. General documents on sustainable development and legal instruments on high seas fisheries are analyzed in order to see in which way they refer to each other and whether they provide a sufficiently comprehensive framework to ensure the sustainable management of fisheries in the high seas.

  13. Fisheries statistical bulletin, Kainji Lake, Nigeria, 1999

    OpenAIRE

    2000-01-01

    A tabulated summary is presented of the main Lake Kainji fisheries data collected to date (1999) by the Nigerian-German Kainji Lake Fisheries Promotion Project, together with a current overview of the fishery. The data are given under the following sections: 1) Fishing localities and types; 2) Frame survey data; 3) Number of licensed fishermen by state; 4) Mesh size distribution; 5) Fishing net characteristics; 6) Fish yield; 7) Average monthly CPUE by gear type; 8)Average monthly fishing act...

  14. Fisheries statistical bulletin, Kainji Lake, Nigeria, 1998

    OpenAIRE

    1999-01-01

    A tabulated summary is presented of the main fisheries data collected to date (1998) by the Nigerian-German Kainji Lake Fisheries Promotion Project, together with a current overview of the fishery. The data are given under the following sections: 1) Fishing localities and types; 2) Frame survey data; 3) Number of licensed fishermen by state; 4) Mesh size distribution; 5) Fishing net characteristics; 6) Fish yield; 7) Total annual fishing effort by gear type; 8) Total annual value of fish land...

  15. 76 FR 54739 - Pacific Halibut Fishery; Guideline Harvest Levels for the Guided Sport Fishery for Pacific...

    Science.gov (United States)

    2011-09-02

    ... Levels for the Guided Sport Fishery for Pacific Halibut in International Pacific Halibut Commission... 2011 Pacific halibut guideline harvest levels (GHLs) for the guided sport fishery in International... to inform the public about the 2011 GHLs for the guided sport fishery for halibut. The GHLs are...

  16. 78 FR 18323 - Pacific Halibut Fishery; Guideline Harvest Levels for the Guided Sport Fishery for Pacific...

    Science.gov (United States)

    2013-03-26

    ... Levels for the Guided Sport Fishery for Pacific Halibut in International Pacific Halibut Commission... 2013 Pacific halibut guideline harvest levels (GHLs) for the guided sport fishery in International... to inform the public about the 2013 GHLs for the guided sport fishery for halibut. The GHLs are...

  17. 76 FR 28328 - Fisheries of the Northeastern United States; Northeast Skate Complex Fishery; Framework Adjustment 1

    Science.gov (United States)

    2011-05-17

    ... based on abundance indices in the NMFS Northeast Fisheries Science Center bottom trawl survey. Amendment... skate wings (11,350 lb (5,148 kg) whole weight) per trip for the skate wing fishery, and an AM that... (1,135 lb (515 kg) whole weight) when 80 percent of the TAL for the wing fishery is reached. In FY...

  18. 76 FR 18505 - Fisheries of the Northeastern United States; Northeast Skate Complex Fishery; Framework Adjustment 1

    Science.gov (United States)

    2011-04-04

    ... indices in the NMFS Northeast Fisheries Science Center bottom trawl survey. Amendment 3 to the Skate FMP...,350 lb (5,148 kg) whole weight) per trip for the skate wing fishery, and an AM that further reduces... (515 kg) whole weight) when 80 percent of the TAL for the wing fishery is reached. In FY 2010, the...

  19. 78 FR 57348 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2013-09-18

    ... States; Coastal Pelagic Species Fisheries; Annual Specifications AGENCY: National Marine Fisheries..., 2014. This rule is proposed according to the Coastal Pelagic Species (CPS) Fishery Management Plan (FMP...-0135, click the ``Comment Now!'' icon, complete the required fields, and enter or attach your comments...

  20. 78 FR 6794 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2013-01-31

    ... States; Coastal Pelagic Species Fisheries; Annual Specifications AGENCY: National Marine Fisheries... according to the Coastal Pelagic Species (CPS) Fishery Management Plan (FMP). The proposed 2013 maximum HG...-0005, click the ``Comment Now!'' icon, complete the required fields, and enter or attach your comments...

  1. 77 FR 73005 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2012-12-07

    ... States; Coastal Pelagic Species Fisheries; Annual Specifications AGENCY: National Marine Fisheries... rule is proposed according to the Coastal Pelagic Species (CPS) Fishery Management Plan (FMP). The... required fields if you wish to remain anonymous). Attachments to electronic comments will be accepted in...

  2. 77 FR 21958 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2012-04-12

    ... States; Coastal Pelagic Species Fisheries; Annual Specifications AGENCY: National Marine Fisheries... rule is proposed according to the Coastal Pelagic Species (CPS) Fishery Management Plan (FMP). The... required fields if you wish to remain anonymous). Attachments to electronic comments will be accepted in...

  3. 75 FR 53261 - Fisheries of the Northeastern United States; Northeast Skate Complex Fishery; Reduction of Skate...

    Science.gov (United States)

    2010-08-31

    ... United States; Northeast Skate Complex Fishery; Reduction of Skate Wing Fishery Possession Limit AGENCY.... ACTION: Temporary rule; inseason adjustment. SUMMARY: NMFS announces the reduction of the skate wing fishery possession limit for the Skate Management Unit for the remainder of the 2010 fishing year...

  4. Promoting selective fisheries through certification? An analysis of the PNA unassociated-sets purse seine fishery

    NARCIS (Netherlands)

    Groeneveld, R.A.; Quaas, Martin F.

    2016-01-01

    The certification by the Marine Stewardship Council of the unassociated-sets purse seine fishery of the Parties to the Nauru Agreement (PNA) has the potential to improve stocks of the fishery's main three tuna species, as well as to allow the PNA to extract more resource rents from the fishery.

  5. 77 FR 14697 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit...

    Science.gov (United States)

    2012-03-13

    ... possession limits for Georges Bank (GB) cod and Southern New England (SNE)/Mid-Atlantic (MA) yellowtail... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XB059 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Adjustments for the Common Pool Fishery...

  6. 76 FR 18661 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit...

    Science.gov (United States)

    2011-04-05

    ... Southern New England (SNE)/Mid-Atlantic (MA) yellowtail flounder, and reduces the trip limit GOM cod and... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XA304 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Adjustments for the Common Pool Fishery...

  7. 77 FR 25630 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2012-05-01

    ... measures for the 2012 Gulf of Maine (GOM) Atlantic cod fishery on April 3, 2012. These measures were... interested in the 2012 GOM cod fishery. Because the effective date in the April 3 rule is inconsistent with... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-BB89 Magnuson-Stevens Fishery...

  8. 78 FR 10556 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit...

    Science.gov (United States)

    2013-02-14

    ... facilitate the harvest of Georges Bank cod, Gulf of Maine cod, and Southern New England/Mid-Atlantic... National Oceanic and Atmospheric Administration 50 CFR Part 648 RIN 0648-XC456 Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Trip Limit Adjustments for the Common Pool Fishery...

  9. 77 FR 25915 - Fisheries Off West Coast States; West Coast Salmon Fisheries; 2012 Management Measures

    Science.gov (United States)

    2012-05-02

    ... caught primarily in fisheries north of Cape Falcon, Oregon and other fisheries that occur north of the U... Salmon Treaty with Canada (PST). Other Chinook salmon stocks caught in fisheries north of Cape Falcon are... abundance) multiplied by F MSY (.78) or 180,260 returning spawners. ABC is 819,400 multiplied by F ABC (F...

  10. 77 FR 7544 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-02-13

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Amendment 11; Correction AGENCY... final rule for Amendment 11 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan... Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan was published in the Federal Register on...

  11. 77 FR 40527 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-07-10

    ... Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the 2012 Trimester 2 Directed Longfin Squid Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... percent of the Trimester 2 longfin squid (longfin) quota is projected to be harvested by 0001 hours, July...

  12. 75 FR 1024 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2010-01-08

    ...; Atlantic Mackerel, Squid, and Butterfish Fisheries; Control Date for Loligo and Illex Squid AGENCY... squid (Loligo) and Illex squid (Illex) fisheries. SUMMARY: NMFS announces a future proposed rulemaking for the Atlantic mackerel, squid, and butterfish (MSB) fisheries. This rulemaking could institute...

  13. 77 FR 74159 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-12-13

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Framework Adjustment 7 AGENCY... on the longfin squid fishery from a catch cap to a discard cap in Framework Adjustment 7 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan,. This action also proposes reducing the...

  14. 76 FR 51272 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2011-08-18

    ... Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Closure of the 2011 Trimester 2 Directed Loligo Squid Fishery AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and... percent of the Trimester 2 Loligo squid (Loligo) quota is projected to be harvested by 0001 hours, August...

  15. 78 FR 14230 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2013-03-05

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Framework Adjustment 7 AGENCY.... ACTION: Final rule. SUMMARY: NMFS is changing the butterfish mortality cap on the longfin squid fishery... Mackerel, Squid, and Butterfish Fishery Management Plan. This action also reduces the butterfish mortality...

  16. Critical report of current fisheries management measures implemented for the North Sea mixed demersal fisheries

    DEFF Research Database (Denmark)

    Nielsen, J. Rasmus; Ulrich, Clara; Hegland, Troels J.

    The present report is an EU-FP7-SOCIOEC Report giving an overview and critical evaluation of the current management measures implemented for the North Sea mixed demersal fisheries and the fish stocks involved in this. Also, this involves review and critical evaluation of the scientific advice...... supporting the fisheries management for the North Sea mixed demersal fisheries and the stocks involved herein....

  17. 78 FR 48852 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2013-08-12

    ... of the Sustainable Fisheries Coalition/University of Massachusetts Dartmouth School of Marine Science...; Establish a mortality cap for river herring and shad to directly control mortality in the mackerel fishery... in the New England Fishery Management Council's (NEFMC) Amendment 5 to the Atlantic Herring FMP...

  18. Kennisbasis WOT Fisheries 2012 - Maintaining Excellence and Innovation in Fisheries Research

    NARCIS (Netherlands)

    Dickey-Collas, M.; Beek, van F.A.

    2011-01-01

    The KBWOT Fisheries programme is fundamental to the maintenance and development of the expertise that underpins the statutory obligations of fisheries monitoring and advice for the Netherlands. The structure of the KBWOT Fisheries programme for 2012 reflects the recent discussions on the research

  19. KB WOT Fisheries 2015 - Maintaining Excellence and Innovation in Fisheries Research

    NARCIS (Netherlands)

    Damme, van C.J.G.; Verver, S.W.

    2015-01-01

    The KB WOT Fisheries programme is essential to the maintenance and development of the expertise which are needed for the Dutch statutory obligations in fisheries monitoring and advice. The contents of the KB WOT Fisheries programme for 2015 reflects the needs of the research developments the WOT

  20. KB WOT Fisheries 2014 - Maintaining Excellence and Innovation in Fisheries Research

    NARCIS (Netherlands)

    Damme, van C.J.G.; Verver, S.W.

    2013-01-01

    The KB WOT Fisheries programme is fundamental to the maintenance and development of expertise needed to carry out the statutory obligations of the Dutch WOT Fisheries monitoring and advice. The structure of the KB WOT Fisheries programme 2014 is a result of discussions on the research direction and

  1. Ecosystem-based fisheries management: confronting tradeoffs

    National Research Council Canada - National Science Library

    Link, J.S

    2010-01-01

    .... Incorporating more holistic considerations into fisheries management by addressing the tradeoffs among the range of issues involved, such as ecological principles, legal mandates, and the interests...

  2. Incentive-based approaches to sustainable fisheries

    National Research Council Canada - National Science Library

    Grafton, R Q; Arnason, Ragnar; Bjorndal, Trond; Campbell, David; Campbell, Harry F; Clark, Colin W; Connor, Robin; Dupont, Diane P; Hannesson, Rognvaldur; Hilborn, Ray; Kirkley, James E; Kompas, Tom; Lane, Daniel E; Munro, Gordon R; Pascoe, Sean; Squires, Dale; Steinshamn, Stein I.v.a.r; Turris, Bruce R; Weninger, Quinn

    2006-01-01

    ...: inappropriate incentives bearing on fishers and the ineffective governance that frequently exists in commercial, developed fisheries managed primarily by total-harvest limits and input controls...

  3. The Southeast Fisheries Science Center (SEFSC)

    Data.gov (United States)

    Federal Laboratory Consortium — The Southeast Fisheries Science Center (SEFSC) is headquartered in Miami, FL. The SEFSC is responsible for scientific research on living marine resources that occupy...

  4. Using an Ecosystem Model to Evaluate Fisheries Management ...

    African Journals Online (AJOL)

    Town, Marine Research Institute, Rondebosch 7701, South Africa. Keywords: Fisheries management, ecosystem modelling, artisanal fisheries, climate change impacts, trophodynamics, coral reefs. Abstract—A coral reef ecosystem simulation model, CAFFEE, developed to evaluate the effects of fisheries management ...

  5. 75 FR 70722 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2010-11-18

    .... Howard, Executive Director, New England Fishery Management Council; telephone: (978) 465-0492... develop recommendations on proposed penalty schedule. Other business may be discussed. Although non..., 2010. Tracey L. Thompson, Acting Director, Office of Sustainable Fisheries, National Marine Fisheries...

  6. Biology, fishery, conservation and management of Indian Ocean tuna fisheries

    Science.gov (United States)

    Gopalakrishna Pillai, N.; Satheeshkumar, Palanisamy

    2012-12-01

    The focus of the study is to explore the recent trend of the world tuna fishery with special reference to the Indian Ocean tuna fisheries and its conservation and sustainable management. In the Indian Ocean, tuna catches have increased rapidly from about 179959 t in 1980 to about 832246 t in 1995. They have continued to increase up to 2005; the catch that year was 1201465 t, forming about 26% of the world catch. Since 2006 onwards there has been a decline in the volume of catches and in 2008 the catch was only 913625 t. The Principal species caught in the Indian Ocean are skipjack and yellowfin. Western Indian Ocean contributed 78.2% and eastern Indian Ocean 21.8% of the total tuna production from the Indian Ocean. The Indian Ocean stock is currently overfished and IOTC has made some recommendations for management regulations aimed at sustaining the tuna stock. Fishing operations can cause ecological impacts of different types: by catches, damage of the habitat, mortalities caused by lost or discarded gear, pollution, generation of marine debris, etc. Periodic reassessment of the tuna potential is also required with adequate inputs from exploratory surveys as well as commercial landings and this may prevent any unsustainable trends in the development of the tuna fishing industry in the Indian Ocean.

  7. Mixed fisheries forecasts – lessons learned from their initial application to North Sea fisheries

    DEFF Research Database (Denmark)

    Holmes, Steven J.; Ulrich, Clara; Reeves, Stuart A.

    2012-01-01

    these approaches in routine scientific advice for the first time. The demersal fisheries of the North Sea provide a particularly interesting context for this work due to their high complexity in terms of the numbers of fleets, gears, metiérs and species involved, and also because mixed-fishery effects have...... contributed to the lack of recovery of the North Sea cod stock. The implementation of mixed-fishery forecasts which account for the fishery complexity and thus allow mixed-fishery effects to be modelled has posed a number of challenges relating to issues such as data requirements and the need to integrate...... the work with the existing single stock assessments. The explicit representation of the complexity of the fisheries also raises questions about the extent to which mixed fisheries science can be used to give „advice‟ in the traditional sense. This paper addresses the challenges and issues that have arisen...

  8. Elucidation of the regio- and chemoselectivity of enzymatic allylic oxidations with Pleurotus sapidus – conversion of selected spirocyclic terpenoids and computational analysis

    Directory of Open Access Journals (Sweden)

    Verena Weidmann

    2013-10-01

    Full Text Available Allylic oxidations of olefins to enones allow the efficient synthesis of value-added products from simple olefinic precursors like terpenes or terpenoids. Biocatalytic variants have a large potential for industrial applications, particularly in the pharmaceutical and food industry. Herein we report efficient biocatalytic allylic oxidations of spirocyclic terpenoids by a lyophilisate of the edible fungus Pleurotus sapidus. This ‘’mushroom catalysis’’ is operationally simple and allows the conversion of various unsaturated spirocyclic terpenoids. A number of new spirocyclic enones have thus been obtained with good regio- and chemoselectivity and chiral separation protocols for enantiomeric mixtures have been developed. The oxidations follow a radical mechanism and the regioselectivity of the reaction is mainly determined by bond-dissociation energies of the available allylic CH-bonds and steric accessibility of the oxidation site.

  9. African Journal of Tropical Hydrobiology and Fisheries

    African Journals Online (AJOL)

    The African Journal of Tropical Hydrobiology and Fisheries (Afr. J. Trop. Hydrobiol. Fish.) provides a medium for the publication of original and well supported ideas and findings on techniques, methodology and research findings from aquatic scientists, fishery economists and sociologists. CALL FOR PAPERS – for the ...

  10. 75 FR 23245 - American Lobster Fishery Management

    Science.gov (United States)

    2010-05-03

    ... National Oceanic and Atmospheric Administration RIN 0648-AT31 American Lobster Fishery Management AGENCY... impact statement (DEIS) that identifies several proposed management actions and alternatives for the American lobster fishery in Federal waters. The management actions are based on recommendations to NMFS by...

  11. Traditional Fisheries of Antongil Bay, Madagascar | Doukakis ...

    African Journals Online (AJOL)

    Madagascar's marine fisheries provide revenue and sustenance for the island nation. Antongil Bay, the largest shallow-water bay along Madagascar's eastern coast, harbors significant marine resources and is heavily utilized by traditional, artisanal (shark-fin) and industrial fisheries. Mean hourly catch rates are just under 1 ...

  12. Opportunity for marine fisheries reform in China.

    Science.gov (United States)

    Cao, Ling; Chen, Yong; Dong, Shuanglin; Hanson, Arthur; Huang, Bo; Leadbitter, Duncan; Little, David C; Pikitch, Ellen K; Qiu, Yongsong; Sadovy de Mitcheson, Yvonne; Sumaila, Ussif Rashid; Williams, Meryl; Xue, Guifang; Ye, Yimin; Zhang, Wenbo; Zhou, Yingqi; Zhuang, Ping; Naylor, Rosamond L

    2017-01-17

    China's 13th Five-Year Plan, launched in March 2016, provides a sound policy platform for the protection of marine ecosystems and the restoration of capture fisheries within China's exclusive economic zone. What distinguishes China among many other countries striving for marine fisheries reform is its size-accounting for almost one-fifth of global catch volume-and the unique cultural context of its economic and resource management. In this paper, we trace the history of Chinese government priorities, policies, and outcomes related to marine fisheries since the 1978 Economic Reform, and examine how the current leadership's agenda for "ecological civilization" could successfully transform marine resource management in the coming years. We show how China, like many other countries, has experienced a decline in the average trophic level of its capture fisheries during the past few decades, and how its policy design, implementation, and enforcement have influenced the status of its wild fish stocks. To reverse the trend in declining fish stocks, the government is introducing a series of new programs for sustainable fisheries and aquaculture, with greater traceability and accountability in marine resource management and area controls on coastal development. As impressive as these new plans are on paper, we conclude that serious institutional reforms will be needed to achieve a true paradigm shift in marine fisheries management in China. In particular, we recommend new institutions for science-based fisheries management, secure fishing access, policy consistency across provinces, educational programs for fisheries managers, and increasing public access to scientific data.

  13. International Regulation of Central Arctic Ocean Fisheries

    NARCIS (Netherlands)

    Molenaar, E.J.

    Due in particular to the impacts of climate change, the adequacy of the international regulation of Central Arctic Ocean fisheries has come under increasing scrutiny in recent years. As shown in this article, however, international regulation of Central Arctic Ocean fisheries is by no means entirely

  14. Fisheries management and the value chain

    DEFF Research Database (Denmark)

    Nielsen, Max; Andersen, Peder; Ravensbeck, Lars

    2017-01-01

    management. The purpose of this paper is to address this gap. The model is applied to the pelagic fisheries of the Northeast Atlantic and considers the whole value chain, identifying resource rent and consumer and producer surpluses. The results show that the sum of the resource rent and the producer surplus...... in the harvest sector in 2007 was 32% of the landing value, compared with the maximum economic yield of 49%. Hence, the fisheries were quite well managed. To achieve the maximum sum of the resource rent and the producer surplus in the harvest sector, the fleet must be reduced from 156 vessels to 80 vessels......We develop a model to identify the welfare-optimal management of fisheries that operate in the global economy. Historically, fisheries economics has mainly focused on the loss of rent due to fleet overcapacity and less on the potential welfare gain by having a broader approach to fisheries...

  15. Fisheries

    DEFF Research Database (Denmark)

    Poulsen, Bo

    2012-01-01

    Humans have been fishing for more than 100,000 years, and until c. 1900 most fishing practices were sustainable. During the last 100 years almost every corner of the oceans have been heavily impacted by modern industrial fishing. The amount of wild caught fish peaked in 1980, but due to the rapid...

  16. Fisheries

    Science.gov (United States)

    Artifacts from early coastal settlements show that fishing was an important activity for the inhabitants of Alaska. Today, the fish harvested from the waters around Alaska are in excess of two million metric tones per year. The industry is vitally important to the economy of coastal communities. ...

  17. 50 CFR 600.760 - Fishery Negotiation Panel lifetime.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Fishery Negotiation Panel lifetime. 600... ATMOSPHERIC ADMINISTRATION, DEPARTMENT OF COMMERCE MAGNUSON-STEVENS ACT PROVISIONS Fishery Negotiation Panels § 600.760 Fishery Negotiation Panel lifetime. (a) An FNP shall terminate upon either: (1) Submission of...

  18. 77 FR 2038 - New England Fishery Management Council; Public Meeting

    Science.gov (United States)

    2012-01-13

    ... Fisheries Science Center and Mid-Atlantic Fishery Management Council liaisons, as well as NOAA General Counsel, representatives of the U.S. Coast Guard and the Atlantic States Marine Fisheries Commission, and... address the recent Gulf of Maine cod stock assessment and a possible request to NOAA Fisheries for...

  19. 77 FR 19230 - Western Pacific Fishery Management Council; Public Meetings

    Science.gov (United States)

    2012-03-30

    .... Precious corals fishery and coral reef habitat status. iv. Update on Bio-Sampling Program data summary. v... precious coral fisheries. iv. Coral reef habitat status. v. Update on Bio-Sampling Program and Spearfishing... fisheries. iv. Precious corals fishery and coral reef habitat status. v. Update on Bio-Sampling Program Data...

  20. An Investigation on Industrial Fishery in Lagos State, Nigeria ...

    African Journals Online (AJOL)

    This study essentially evaluated and analyzed the state of industrial fishery sector in Lagos State Nigeria. The catch composition, by-catch composition fishery activity, threat to fisheries resources and constraints of the industrial fishery was investigated. The instrument of the study was structured questionnaire administered ...

  1. 27 CFR 28.22 - Vessels employed in the fisheries.

    Science.gov (United States)

    2010-04-01

    ... fisheries. 28.22 Section 28.22 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE... Lading for Use on Certain Vessels and Aircraft § 28.22 Vessels employed in the fisheries. Liquors may be... the fisheries, only for use on vessels of the United States documented to engage in the fisheries and...

  2. State of global fisheries – management policies

    Directory of Open Access Journals (Sweden)

    Alicja Dabrowska

    2013-06-01

    Full Text Available Global fisheries landings have stagnated and are associated with many negative environmental impacts, affecting the economy and food security in many countries around the world. Although many different management policies trying to incorporate a more sustainable and resilient scope have been developed over the years to improve this current fisheries crisis, we are still in the early stages of adopting more adaptive and corrective fisheries management globally, as well as enforcing it, due to the inherent difficulties of managing uncertain natural resources Upon analysis of different management strategies, using Peru and the European Union as case studies, three major recommendations were made for developing more sustainable and resilient management policies: decentralisation of the management system, ecosystem-based fisheries management and reallocation of subsidies. Finally, possible management strategies for different scenarios predicting the future of fisheries were described. In the current fisheries crisis situation, developing and implementing sustainable and resilient fisheries management strategies should be seen as a long-term investment in the profitability of the industry, as well as an opportunity to decrease social tensions and improve food security.

  3. Management effectiveness of the world's marine fisheries.

    Directory of Open Access Journals (Sweden)

    Camilo Mora

    2009-06-01

    Full Text Available Ongoing declines in production of the world's fisheries may have serious ecological and socioeconomic consequences. As a result, a number of international efforts have sought to improve management and prevent overexploitation, while helping to maintain biodiversity and a sustainable food supply. Although these initiatives have received broad acceptance, the extent to which corrective measures have been implemented and are effective remains largely unknown. We used a survey approach, validated with empirical data, and enquiries to over 13,000 fisheries experts (of which 1,188 responded to assess the current effectiveness of fisheries management regimes worldwide; for each of those regimes, we also calculated the probable sustainability of reported catches to determine how management affects fisheries sustainability. Our survey shows that 7% of all coastal states undergo rigorous scientific assessment for the generation of management policies, 1.4% also have a participatory and transparent processes to convert scientific recommendations into policy, and 0.95% also provide for robust mechanisms to ensure the compliance with regulations; none is also free of the effects of excess fishing capacity, subsidies, or access to foreign fishing. A comparison of fisheries management attributes with the sustainability of reported fisheries catches indicated that the conversion of scientific advice into policy, through a participatory and transparent process, is at the core of achieving fisheries sustainability, regardless of other attributes of the fisheries. Our results illustrate the great vulnerability of the world's fisheries and the urgent need to meet well-identified guidelines for sustainable management; they also provide a baseline against which future changes can be quantified.

  4. Management Effectiveness of the World's Marine Fisheries

    Science.gov (United States)

    Mora, Camilo; Coll, Marta; Libralato, Simone; Pitcher, Tony J.; Sumaila, Rashid U.; Zeller, Dirk; Watson, Reg; Gaston, Kevin J.; Worm, Boris

    2009-01-01

    Ongoing declines in production of the world's fisheries may have serious ecological and socioeconomic consequences. As a result, a number of international efforts have sought to improve management and prevent overexploitation, while helping to maintain biodiversity and a sustainable food supply. Although these initiatives have received broad acceptance, the extent to which corrective measures have been implemented and are effective remains largely unknown. We used a survey approach, validated with empirical data, and enquiries to over 13,000 fisheries experts (of which 1,188 responded) to assess the current effectiveness of fisheries management regimes worldwide; for each of those regimes, we also calculated the probable sustainability of reported catches to determine how management affects fisheries sustainability. Our survey shows that 7% of all coastal states undergo rigorous scientific assessment for the generation of management policies, 1.4% also have a participatory and transparent processes to convert scientific recommendations into policy, and 0.95% also provide for robust mechanisms to ensure the compliance with regulations; none is also free of the effects of excess fishing capacity, subsidies, or access to foreign fishing. A comparison of fisheries management attributes with the sustainability of reported fisheries catches indicated that the conversion of scientific advice into policy, through a participatory and transparent process, is at the core of achieving fisheries sustainability, regardless of other attributes of the fisheries. Our results illustrate the great vulnerability of the world's fisheries and the urgent need to meet well-identified guidelines for sustainable management; they also provide a baseline against which future changes can be quantified. PMID:19547743

  5. Mixed fisheries forecasts—lessons learned from their initial application to North Sea fisheries

    DEFF Research Database (Denmark)

    Holmes, S.J.; Ulrich, Clara; Reeves, S.A.

    2012-01-01

    these approaches in routine scientific advice for the first time. The demersal fisheries of the North Sea provide a particularly interesting context for this work because of their high complexity in terms of the numbers of fleets, gears, métiers, and species involved, and also because mixedfishery effects have...... contributed to the lack of recovery of the North Sea cod stock. The implementation of mixed‐fishery forecasts which account for the fishery complexity and thus allow mixed‐fishery effects to be modelled has posed a number of challenges relating to issues such as data requirements and the need to integrate...... through the practical implementation of mixed‐fishery forecasts, then discusses the further developments that will be required to progress towards more integrated multistock management using mixed‐fishery management plans...

  6. 78 FR 28146 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Shrimp Fishery of the Gulf of...

    Science.gov (United States)

    2013-05-14

    ... prevent the waste of brown shrimp that would be discarded in fishing operations because of their small... INFORMATION: The Gulf shrimp fishery is managed under the Fishery Management Plan for the Shrimp Fishery of the Gulf of Mexico (FMP). The FMP was prepared by the Gulf of Mexico Fishery Management Council and is...

  7. 78 FR 66900 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Amendment 28 to the Fishery...

    Science.gov (United States)

    2013-11-07

    ... optimum yield, particularly with respect to food production and recreational opportunities, while...://sero.nmfs.noaa.gov/sustainable_fisheries/gulf_fisheries/reef_fish/index.html . After the DEIS..., 2013. Kelly Denit, Acting Deputy Director, Office of Sustainable Fisheries, National Marine Fisheries...

  8. 76 FR 75488 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Spiny Lobster Fishery of the Gulf...

    Science.gov (United States)

    2011-12-02

    ... Caribbean, Gulf of Mexico, and South Atlantic; Spiny Lobster Fishery of the Gulf of Mexico and South... 10 to the Fishery Management Plan for the Spiny Lobster Fishery of the Gulf of Mexico and South... Councils (Councils). This rule revises the lobster species contained within the fishery management unit...

  9. 78 FR 27084 - Fisheries of the Caribbean, Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of...

    Science.gov (United States)

    2013-05-09

    ..._fisheries/gulf_fisheries/reef_fish/2013/am37/documents/pdfs/gray_triggerfish_outreach.pdf . The document..., Gulf of Mexico, and South Atlantic; Reef Fish Fishery of the Gulf of Mexico; Amendment 37 AGENCY... triggerfish described in Amendment 37 to the Fishery Management Plan for the Reef Fish Resources of the Gulf...

  10. Achieving maximum sustainable yield in mixed fisheries: a management approach for the North Sea demersal fisheries

    DEFF Research Database (Denmark)

    Ulrich, Clara; Vermard, Youen; Dolder, Paul J.

    2017-01-01

    Achieving single species maximum sustainable yield (MSY) in complex and dynamic fisheries targeting multiple species (mixed fisheries) is challenging because achieving the objective for one species may mean missing the objective for another. The North Sea mixed fisheries are a representative....... An objective method is suggested that provides an optimal set of fishing mortality within the range, minimizing the risk of total allowable catch mismatches among stocks captured within mixed fisheries, and addressing explicitly the trade-offs between the most and least productive stocks....

  11. 78 FR 33020 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Amendment 5

    Science.gov (United States)

    2013-06-03

    .... Bullard, Regional Administrator, NMFS, Northeast Regional Office, 55 Great Republic Drive, Gloucester, MA.... In 2010, the Northeast Fisheries Observer Program (NEFOP) revised the training curriculum for...

  12. The Economics of Open-Access Fisheries: Subsidies and Performance of Vietnamese Fisheries

    OpenAIRE

    Nguyen, Ngoc Duy

    2016-01-01

    Paper III and IV of this thesis are not available in Munin.Paper III. Nguyen Ngoc Duy and Ola Flåten. Profitability effects and fishery subsidies: Average treatment effects based on propensity scores. (Manuscript)Paper IV: Nguyen Ngoc Duy and Ola Flåten. Efficiency analysis of fisheries using stock proxies. (Manuscript). Published version available in Fisheries Research 181 (2016) 102–113 This dissertation focuses on analysing the economics of an open-access fishery and on evaluating the e...

  13. Guam Commercial Fisheries BioSampling (CFBS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Guam Commercial Fisheries Biosampling program, which collects length and weight frequency data for whole commercial catches, and samples 4-8 species for in-depth...

  14. American Fisheries Act (AFA) Permit Program

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Beginning January 1, 2000, all vessels and processors wishing to participate in the non-CDQ Bering Sea and Aleutian Islands (BSAI) pollock fishery are required to...

  15. Fishery Management Plan, Tetlin National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The plan is a resource plan based upon the general issues identified from the comprehensive planning process and more specifically, from fishery professionals of the...

  16. Energy consumption in the Danish fishery

    DEFF Research Database (Denmark)

    Thrane, Mikkel

    2004-01-01

    Previous studies based on life-cycle assessment (LCA) in Denmark and Sweden have shown that the fishery is the environmental "hot spot" in the life cycle of certain fish products. Within the fishery, fuel consumption is one of the most important factors addressed by LCA. The present study reveals...... that there are great differences in fuel consumption between fisheries targeting groundfish or shellfish and those targeting pelagic fish or industrial fish. Here, I show that fuel consumption per kilogram of caught fish varies considerably as a function of fishing gear and vessel size, even considering the same...... target species. I argue that these differences need to be addressed in the search for a fuel-efficient fishery. Improvements in fuel efficiency may be consistent with other objectives, such as reduced impacts on seafloor habitats and reduced discard Previous studies based on life-cycle assessment (LCA...

  17. Fishery management scenarios : Rocky Mountain Arsenal

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The fishery resources at Rocky Mountain Arsenal (RMA) have been managed by the US Fish and Wildlife Service since the early 1960's. Management activities included...

  18. A conservation program for Alaska's commercial fisheries

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — It is the purpose of this report to show how the present programs of the Alaska Region of the Bureau of Commercial Fisheries relate to problems of the various...

  19. Fishery Management Recommendations : Necedah National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — These management recommendations were prepared by the Winona Fishery Resources Office of the U.S. Fish Wildlife Service for the Necedah National Wildlife Refuge....

  20. 78 FR 3402 - Marine Fisheries Advisory Committee

    Science.gov (United States)

    2013-01-16

    ...: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce... 1315 East- West Highway, Silver Spring, MD 20910. FOR FURTHER INFORMATION CONTACT: Mark Holliday, (301... Service. BILLING CODE 3510-22-P ...

  1. Fishery Management Plan : Mingo National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The objectives of the Mingo NWR Fishery Management Plan are to maintain and improve the quality of aquatic habitats for a well-balanced community of fish and other...

  2. NMFS Fishery-Independent Survey System (FINSS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Fishery Independent Survey System (FINSS) is a national system that characterizes NMFS ocean observation activities, stock and ecosystem data collections during...

  3. Commercial Fisheries Database Biological Sample (CFDBS)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Age and length frequency data for finfish and invertebrate species collected during commercial fishing vessels. Samples are collected by fisheries reporting...

  4. Unregulated high seas fisheries: the interlopers issue

    OpenAIRE

    Coelho, M. P.; Filipe, J.; Manuel Alberto M. Ferreira

    2015-01-01

    Illegal behaviour and public enforcement of law are important theoretical and empirical subjects for Economics. They were dormant in economic scholarship, until the article of Becker, 1968, “Crime and Punishment: An Economic Approach”. In the context of Fisheries Economics, the problem can be seen as an externality arising when exclusive property rights are absent. That absence depends on the costs of defining and enforcing exclusivity and the problem becomes more complex when fisheries are t...

  5. TECHNOLOGY AND MANAGEMENT IN MAURITANIAN CEPHALOPOD FISHERIES

    OpenAIRE

    Diop, Hamady; Kazmierczak, Richard F., Jr.

    1995-01-01

    If the technology in a multi-species fishery is such that there is jointness in inputs and non-separability between inputs and outputs, then management on a species-by-species basis may lead to unintended outcomes, including over-exploitation of the resource. This study investigates the nature of the technical and economic relationships underlying the 1989-1990 Mauritanian cephalopod fishery by estimating a system of dual output supply functions derived from a generalized Leontief revenue fun...

  6. Status and solutions for the world's unassessed fisheries.

    Science.gov (United States)

    Costello, Christopher; Ovando, Daniel; Hilborn, Ray; Gaines, Steven D; Deschenes, Olivier; Lester, Sarah E

    2012-10-26

    Recent reports suggest that many well-assessed fisheries in developed countries are moving toward sustainability. We examined whether the same conclusion holds for fisheries lacking formal assessment, which comprise >80% of global catch. We developed a method using species' life-history, catch, and fishery development data to estimate the status of thousands of unassessed fisheries worldwide. We found that small unassessed fisheries are in substantially worse condition than assessed fisheries, but that large unassessed fisheries may be performing nearly as well as their assessed counterparts. Both small and large stocks, however, continue to decline; 64% of unassessed stocks could provide increased sustainable harvest if rebuilt. Our results suggest that global fishery recovery would simultaneously create increases in abundance (56%) and fishery yields (8 to 40%).

  7. 76 FR 23964 - Fisheries in the Western Pacific; Pelagic Fisheries; Purse Seine Prohibited Areas Around American...

    Science.gov (United States)

    2011-04-29

    ... Pacific; Pelagic Fisheries; Purse Seine Prohibited Areas Around American Samoa AGENCY: National Marine... required name and organization fields if you wish to remain anonymous). Attachments to electronic comments... Plan for Pelagic Fisheries of the Western Pacific Region (Pelagics FEP), which describes the issues...

  8. 76 FR 18706 - Fisheries in the Eastern Pacific Ocean; Pelagic Fisheries; Vessel Identification Requirements

    Science.gov (United States)

    2011-04-05

    ... Eastern Pacific Ocean; Pelagic Fisheries; Vessel Identification Requirements AGENCY: National Marine... sensitive or protected information. NMFS will accept anonymous comments (enter N/A in the required fields...-line, tuna purse seine, and pelagic longline fisheries. ] TP05AP11.010 Under the Convention, vessels...

  9. 78 FR 26523 - Fisheries of the Northeastern United States; Atlantic Bluefish Fishery; 2013 and 2014 Atlantic...

    Science.gov (United States)

    2013-05-07

    ... landings (TAL) that will control fishing mortality (F). The Council may also recommend a research set-aside..., and ACT are specified at 27.472 million lb (12,461 mt). The ACT is initially allocated between the recreational fishery (83 percent = 22.801 million lb, 10,342 mt) and the commercial fishery (17 percent = 4.670...

  10. 76 FR 6567 - Pacific Halibut Fisheries; Guided Sport Charter Vessel Fishery for Halibut; Recordkeeping and...

    Science.gov (United States)

    2011-02-07

    ... sheets, modify the logbook recording requirements, and add a definition of fishing week. This action is... is intended to achieve the halibut fishery management goals of the North Pacific Fishery Management Council and to support the conservation and management provisions of the Northern Pacific Halibut Act of...

  11. The common fisheries policy of the European Union and fisheries economics

    DEFF Research Database (Denmark)

    Frost, Hans; Andersen, Peder

    2006-01-01

    The revision of the Common Fisheries Policy of the European Union in 2003 was communicated in a ‘Roadmap’, including the opinion of the EU Commission on how to reform the fisheries policy. This paper reviews the Roadmap and confronts the opinion and initiatives proposed by the Commission with the...

  12. 76 FR 19929 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2011-04-11

    ... LAGC fisheries. To account for management uncertainty, Amendment 15 proposes ACTs for each fleet. For.... Management Uncertainty and ACT Amendment 15 proposes that management uncertainty in the scallop fishery... during the course of the fishing year. Management uncertainty for the LAGC IFQ fleet is considered very...

  13. 75 FR 18355 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Framework Adjustment 44

    Science.gov (United States)

    2010-04-09

    ... = Southern New England/Mid-Atlantic; CC = Cape Cod/GOM; plaice = American plaice; witch = witch flounder... the current Atlantic Sea Scallop FMP, if the scallop fishery harvests in excess of the yellowtail... of the fishery (72.5 percent and 27.5 percent for haddock; 66.3 percent and 33.7 percent for cod...

  14. 75 FR 5016 - Fisheries of the Northeastern United States; Northeast Multispecies Fishery; Framework Adjustment 44

    Science.gov (United States)

    2010-02-01

    ... (particularly for GOM cod and pollock). In particular, industry members noted that fishery participants may.../Mid-Atlantic; CC = Cape Cod/GOM; plaice = American plaice; witch = witch flounder; winter = winter... Atlantic Sea Scallop FMP, if the scallop fishery harvests in excess of the yellowtail flounder sub...

  15. Can fisheries-induced evolution shift reference points for fisheries management?

    NARCIS (Netherlands)

    Heino, M.; Baulier, L.; Boukal, D.S.; Mollet, F.M.; Rijnsdorp, A.D.

    2013-01-01

    Biological reference points are important tools for fisheries management. Reference points are not static, but may change when a population's environment or the population itself changes. Fisheries-induced evolution is one mechanism that can alter population characteristics, leading to “shifting”

  16. 76 FR 43773 - Fisheries of the Northeastern United States; Atlantic Sea Scallop Fishery; Framework Adjustment 22

    Science.gov (United States)

    2011-07-21

    ... calculate each vessel's IFQ for a given FY. For the LA fleet, Amendment 15 set a management uncertainty... Framework Adjustment 22 (Framework 22) to the Atlantic Sea Scallop Fishery Management Plan (FMP), which was developed and adopted by the New England Fishery Management Council (Council). The specifications in...

  17. 76 FR 42663 - Magnuson-Stevens Fishery Conservation and Management Act Provisions; Fisheries of the...

    Science.gov (United States)

    2011-07-19

    ... midwater trawl fleet voluntarily moved away from Atlantic Herring Management Area 3 (GB) to avoid fishing... Conservation and Management Act Provisions; Fisheries of the Northeastern United States; Northeast (NE... Multispecies Fishery Management Plan (FMP). FW 46 was developed and submitted to NMFS for approval by the New...

  18. 76 FR 57945 - Fisheries Off West Coast States; West Coast Salmon Fisheries; Notice of Availability for...

    Science.gov (United States)

    2011-09-19

    ... intended to prevent and end overfishing and rebuild fisheries through implementation of status determination criteria, overfishing limits, annual catch limits, and accountability measures. Amendment 16 would... guidelines implementing MSRA National Standard 1 (NS1Gs) to prevent and end overfishing and rebuild fisheries...

  19. 75 FR 22103 - Atlantic Coastal Fisheries Cooperative Management Act Provisions; Atlantic Coastal Shark Fishery

    Science.gov (United States)

    2010-04-27

    ... Management Act Provisions; Atlantic Coastal Shark Fishery AGENCY: National Marine Fisheries Service (NMFS... Atlantic Coastal Sharks (Plan) and that the measures New Jersey has failed to implement and enforce are necessary for the conservation of the shark resource. This determination is consistent with the findings of...

  20. 77 FR 29955 - Fisheries Off West Coast States; Pacific Coast Groundfish Fishery Management Plan; Trawl...

    Science.gov (United States)

    2012-05-21

    ... Fishery NMFS proposes to add regulatory language to allow it to deposit into QS accounts, on or about... fisheries on Chinook salmon (Puget Sound, Snake River spring/summer, Snake River fall, upper Columbia River...), chum salmon (Hood Canal summer, Columbia River), sockeye salmon (Snake River, Ozette Lake), and...

  1. 77 FR 58507 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-09-21

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Framework Adjustment 5 AGENCY... Adjustment 5 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan (MSB FMP), which was... this proposed rule is consistent with the Atlantic Mackerel, Squid, and Butterfish FMP, other provision...

  2. 78 FR 53404 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2013-08-29

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Amendment 14 AGENCY: National Marine... the Atlantic Mackerel, Squid and Butterfish Management Plan. The Mid-Atlantic Fishery Management Council developed Amendment 14 to improve catch monitoring for the Atlantic mackerel, squid, and...

  3. 76 FR 47492 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fishery...

    Science.gov (United States)

    2011-08-05

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fishery; Emergency Rule Extension, Revision of... applies the increase to the butterfish mortality cap in the Loligo (Doryteuthis) squid fishery, based on.... Specifications for Atlantic mackerel, Loligo squid, and Illex squid also remain unchanged. Amendment 10 to the...

  4. 77 FR 23635 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-04-20

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Specifications and Management Measures... regulatory text in the final rule for 2012 Specifications for the Atlantic Mackerel, Squid, and Butterfish... specifications and management measures for the Atlantic mackerel and squid fisheries, and the interim final rule...

  5. 75 FR 37739 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2010-06-30

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Adjustment to the Loligo Trimester 2... Fishing Year (FY) Trimester 2 and 3 Loligo squid quotas. This action complies with the 2010 Specifications and Management Measures for the Atlantic Mackerel, Squid, and Butterfish Fisheries Management Plan...

  6. 77 FR 71720 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2012-12-04

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Framework Adjustment 5 AGENCY... mackerel permits under the Atlantic ] Mackerel, Squid, and Butterfish Fishery Management Plan (MSB FMP). In... Atlantic Mackerel, Squid, and Butterfish FMPs is necessary for the conservation and management of the...

  7. 76 FR 45742 - Fisheries of the Northeastern United States; Atlantic Mackerel, Squid, and Butterfish Fisheries...

    Science.gov (United States)

    2011-08-01

    ... United States; Atlantic Mackerel, Squid, and Butterfish Fisheries; Amendment 11 AGENCY: National Marine... the Atlantic Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan (FMP). Amendment 11 was...) designations for all life stages of mackerel, Loligo squid, Illex squid, and butterfish; and the establishment...

  8. 75 FR 932 - Fisheries Off West Coast States; Coastal Pelagic Species Fisheries; Annual Specifications

    Science.gov (United States)

    2010-01-07

    ... setting an overall HG for the July 1, 2009, through June 30, 2010, fishing season at 10,000 mt. The... fishery and 2,000 mt be set aside for incidental Pacific mackerel landings in other fisheries should the 8...

  9. 75 FR 53379 - Fisheries off West Coast States; Pacific Coast Groundfish Fishery Management Plan; Amendments 20...

    Science.gov (United States)

    2010-08-31

    ... to the extent that such section 5 applies to unfair methods of competition.'' NOAA advises that any... fishery, capacity utilization, the functioning of the quota market, spillover effects into other fisheries... support, deployment limitations and logistics and communication in this rule. The requirements are similar...

  10. 76 FR 54385 - Fisheries of the Northeastern United States; Atlantic Herring Fishery; Regulatory Amendment

    Science.gov (United States)

    2011-09-01

    ... explained that mornings are a busy time on the docks and vessels are often offloading their catch at 0900 hr... adequately analyze the effect of the herring fishery on non-target stocks and contains incorrect stock status... 10 years) and multiple year classes are harvested by the fishery (typically ages 2 through 6x). These...

  11. The widening gap between fisheries biology and fisheries management in the European Union

    NARCIS (Netherlands)

    Corten, A.

    1996-01-01

    The extension of economic zones and the introduction of a common fisheries policy in the European Union have not had the results expected in fish stock management. Fisheries managers seem to be increasingly sceptical about the prospects of exploiting fish stocks at anywhere near the maximum

  12. Sicilian dolphinfish (Coryphaena hippurus fishery

    Directory of Open Access Journals (Sweden)

    A. Potoschi

    1999-12-01

    Full Text Available In 1996, a census was taken of the Sicilian fisheries that engage in dolphinfish (Coryphaena hippurus L. 1758 fishing. Two different surveys were conducted; data on fishing boats were obtained from the Naval Registers and frominterviewing boat owners on the wharf. The area sampled was divided into 3 zones and 6 strata. 205 boats were recorded in the eastern zone (Tyrrhenian and Ionian seas, 57 boats located in 4 different strata were recorded in the western zone. Fishing activities in the Ionian area begin in early August and end in December. In all other areas of Sicily, dolphinfish fishing begins in early September and continues until December. A census was also taken of the equipment used by the various boats for this activity in the different areas. The surveys showed that FADs are the most commonly employed method for dolphinfish fishing. The geographical distribution, number and characteristics were recorded for each area surveyed. The catches for the 1996 fishing season distributed for strata and zone are reported.

  13. Continuing education needs for fishery professionals: a survey of North American fisheries administrators

    Science.gov (United States)

    Rassam, G.N.; Eisler, R.

    2001-01-01

    North American fishery professionals? continuing education needs were investigated in an American Fisheries Society questionnaire sent to 111 senior fishery officials in winter 2000. Based on a response rate of 52.2% (N = 58), a minimum of 2,967 individuals would benefit from additional training, especially in the areas of statistics and analysis (83% endorsement rate), restoration and enhancement (81%), population dynamics (81%), multi-species interactions (79%), and technical writing (79%). Other skills and techniques recommended by respondents included computer skills (72%), fishery modeling (69%), habitat modification (67%), watershed processes (66%), fishery management (64%), riparian and stream ecology (62%), habitat management (62%), public administration (62%), nonindigenous species (57%), and age and growth (55%). Additional comments by respondents recommended new technical courses, training in various communications skills, and courses to more effectively manage workloads.

  14. FISHERY MANAGEMENT IN THE DANUBE CATCHMENT AREA

    Directory of Open Access Journals (Sweden)

    Tomislav Treer

    1999-12-01

    Full Text Available There are three successive regions of the Danube, each of which has to deal with its own problems in fisheries. Sport fishing and ecological recontruction problem matters predominate in the upper flow. These problems also characterize the middle flow, where to a certain extent, commercial fishery is coming into view, while the lower flow has to deal with commercial fishery problems to full extent. The difference is not so much due to the morphometry as to the development and state of the economy of the countries in the river basin, their legislation on fishery and the manner in which the legislation is applied. Numerous dams of the upper flow of the Danube (29 in Germany, 9 in Austria, influence significantly the ichthyocenoses. An extreme example of that is Gabčikovo dam at the Slovak-Hungarian border where fish catch decreased to one fourth. In the lower segment of the Danube fish catch falls down to one third and is followed, by a drastically negative change of fish species composition. The records show that highly valued species as sturgeons, pike and tench are in drastic decline over the last few years. The changes were caused by physical barriers, like dams and weirs, by water pollution, by increasing concentration of nutrients and heavy metals, by poaching and by overexploitation. For all those alarming reasons, some legal interventions in commercial fishery must be undertaken. In the middle flow, where the Danube flows through Croatian territory, there have also been declining trends of bentivore and phytophyl species respectively. The law supports the coexistence of sport and commercial fishery in this area and although sport fishing should be given the advantage, commercial fishing should be rigorously supervised and allowed only when there is a naturally produced surplus. Because of fish migrations and political frontiers of Danube area, it is essential that the neighboring countries coordinate their efforts in managing fisheries

  15. Impacts of climate change on fisheries

    DEFF Research Database (Denmark)

    Brander, Keith

    2010-01-01

    Evidence of the impacts of anthropogenic climate change on marine ecosystems is accumulating, but must be evaluated in the context of the "normal" climate cycles and variability which have caused fluctuations in fisheries throughout human history. The impacts on fisheries are due to a variety of ...... and for adapting to climate change. in order to adapt to changing climate, future monitoring and research must be closely linked to responsive, flexible and reflexive management systems. (C) 2009 Elsevier B.V. All rights reserved.......Evidence of the impacts of anthropogenic climate change on marine ecosystems is accumulating, but must be evaluated in the context of the "normal" climate cycles and variability which have caused fluctuations in fisheries throughout human history. The impacts on fisheries are due to a variety...... experimentally and in controlled conditions. Indirect effects act via ecosystem processes and changes in the production of food or abundance of competitors, predators and pathogens. Recent studies of the effects of climate on primary production are reviewed and the consequences for fisheries production...

  16. Impacts of fisheries on seabird communities

    Directory of Open Access Journals (Sweden)

    Robert W. Furness

    2003-07-01

    Full Text Available Long-line by-catch of albatrosses and petrels may soon lead to species extinctions. Set-net bycatch has caused major reductions in certain seabird populations. Some fisheries may decrease numbers of seabirds by reducing abundance of prey-fish. Other fisheries may increase seabird numbers, by increasing prey-fish abundance through depletion of predatory fish stocks, or by provision of offal and discards. These latter impacts of fisheries on seabirds are often difficult to measure against a background of many and varied environmental and human influences. Depletion of stocks of small lipid-rich fish have reduced numbers of seabirds, in Peru, the Norwegian Sea, and the Barents Sea. However, reductions of predatory fish stocks in the North Sea have more than compensated for quantities of sandeels removed by the sandeel fishery. While piscivorous fish stocks remain low, sandeel fishery and seabirds appear to be able to coexist. However, if piscivorous fish stocks recover in the North Sea, reduced availability of sandeels to seabirds may affect certain species. Provision of discards and offal can stimulate large increases in scavenging seabird numbers. Desirable reductions in discard rates may have an unfortunate side-effect of forcing some scavenging seabirds to turn to killing smaller seabirds, with drastic consequences for community structure.

  17. Dynamic patterns of overexploitation in fisheries.

    Science.gov (United States)

    Perissi, Ilaria; Bardi, Ugo; El Asmar, Toufic; Lavacchi, Alessandro

    2017-09-10

    Understanding overfishing and regulating fishing quotas is a major global challenge for the 21st Century both in terms of providing food for humankind and to preserve the oceans' ecosystems. However, fishing is a complex economic activity, affected not just by overfishing but also by such factors as pollution, technology, financial factors and more. For this reason, it is often difficult to state with complete certainty that overfishing is the cause of the decline of a fishery. In this study, we developed a simple dynamic model specifically designed to isolate and to study the role of depletion on production. The model is based on the well-known Lotka-Volterra model, or Prey-Predator mechanism, assuming that the fish stock and the fishing industry are coupled variables that dynamically affect each other. In the model, the fishing industry acts as the "predator" and the fish stock as the "prey". If the model can fit historical data, in particular relative to the productive decline of specific fisheries, then we have a strong indication that the decline of the fish stock is driving the decline of the fishery production. The model doesn't pretend to be a general description of the fishing industry in all its varied forms; however, the data reported here show that the model can describe several historical cases of fisheries whose production decreased and collapsed, indicating that the overexploitation of the fish stocks is an important factor in the decline of fisheries.

  18. Characteristics of the shark fisheries of Fiji.

    Science.gov (United States)

    Glaus, Kerstin B J; Adrian-Kalchhauser, Irene; Burkhardt-Holm, Patricia; White, William T; Brunnschweiler, Juerg M

    2015-12-02

    Limited information is available on artisanal and subsistence shark fisheries across the Pacific. The aim of this study was to investigate Fiji's inshore fisheries which catch sharks. In January and February 2013, 253 semi-directive interviews were conducted in 117 villages and at local harbours on Viti Levu, Vanua Levu, Taveuni, Ovalau and a number of islands of the Mamanuca and Yasawa archipelagos. Of the 253 interviewees, 81.4% reported to presently catch sharks, and 17.4% declared that they did not presently catch any sharks. Of the 206 fishers that reported to catch sharks, 18.4% targeted sharks and 81.6% caught sharks as bycatch. When targeted, primary use of sharks was for consumption or for sale. Sharks caught as bycatch were frequently released (69.6%), consumed (64.9%) or shared amongst the community (26.8%). Fishers' identification based on an identification poster and DNA barcoding revealed that at least 12 species of elasmobranchs, 11 shark and one ray species (Rhynchobatus australiae) were caught. This study, which is the first focused exploration of the shark catch in Fiji's inshore fisheries, suggests that the country's artisanal shark fisheries are small but have the potential to develop into larger and possibly more targeted fisheries.

  19. Characteristics of the shark fisheries of Fiji

    Science.gov (United States)

    Glaus, Kerstin B. J.; Adrian-Kalchhauser, Irene; Burkhardt-Holm, Patricia; White, William T.; Brunnschweiler, Juerg M.

    2015-12-01

    Limited information is available on artisanal and subsistence shark fisheries across the Pacific. The aim of this study was to investigate Fiji’s inshore fisheries which catch sharks. In January and February 2013, 253 semi-directive interviews were conducted in 117 villages and at local harbours on Viti Levu, Vanua Levu, Taveuni, Ovalau and a number of islands of the Mamanuca and Yasawa archipelagos. Of the 253 interviewees, 81.4% reported to presently catch sharks, and 17.4% declared that they did not presently catch any sharks. Of the 206 fishers that reported to catch sharks, 18.4% targeted sharks and 81.6% caught sharks as bycatch. When targeted, primary use of sharks was for consumption or for sale. Sharks caught as bycatch were frequently released (69.6%), consumed (64.9%) or shared amongst the community (26.8%). Fishers’ identification based on an identification poster and DNA barcoding revealed that at least 12 species of elasmobranchs, 11 shark and one ray species (Rhynchobatus australiae) were caught. This study, which is the first focused exploration of the shark catch in Fiji’s inshore fisheries, suggests that the country’s artisanal shark fisheries are small but have the potential to develop into larger and possibly more targeted fisheries.

  20. 50 CFR 600.753 - Notice of intent to establish a fishery negotiation panel.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Notice of intent to establish a fishery negotiation panel. 600.753 Section 600.753 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT... Fishery Negotiation Panels § 600.753 Notice of intent to establish a fishery negotiation panel. (a...

  1. 50 CFR 600.751 - Determination of need for a fishery negotiation panel.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Determination of need for a fishery negotiation panel. 600.751 Section 600.751 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT... Fishery Negotiation Panels § 600.751 Determination of need for a fishery negotiation panel. A Council or...

  2. 50 CFR 600.754 - Decision to establish a fishery negotiation panel.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 8 2010-10-01 2010-10-01 false Decision to establish a fishery negotiation panel. 600.754 Section 600.754 Wildlife and Fisheries FISHERY CONSERVATION AND MANAGEMENT... Fishery Negotiation Panels § 600.754 Decision to establish a fishery negotiation panel. (a) Determination...

  3. 50 CFR 300.22 - Eastern Pacific fisheries recordkeeping and written reports.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Eastern Pacific fisheries recordkeeping and written reports. 300.22 Section 300.22 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Tuna Fisheries § 300.22 Eastern Pacific fisheries...

  4. 50 CFR 300.23 - Eastern Pacific fisheries - Persons and vessels exempted.

    Science.gov (United States)

    2010-10-01

    ... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Eastern Pacific fisheries - Persons and vessels exempted. 300.23 Section 300.23 Wildlife and Fisheries INTERNATIONAL FISHING AND RELATED ACTIVITIES INTERNATIONAL FISHERIES REGULATIONS Pacific Tuna Fisheries § 300.23 Eastern Pacific fisheries...

  5. Preliminary Fishery Management Report Loess Bluffs National Wildlife Refuge 1953

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Brief report from a fisheries biologist regarding the quality of fish populations at Loess Bluffs NWR. This report was used to draft a fishery management plan for...

  6. Fishery Management Plan: Minnesota Valley National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Minnesota Valley National Wildlife Refuge (NWR) contains a limited fishery resource. Hogback Ponds, Round Lake, Bituminous Pond, and Blick Estate Stream have fishery...

  7. 77 FR 53179 - North Pacific Fishery Management Council; Public Meeting

    Science.gov (United States)

    2012-08-31

    ... crab, Saint Matthew blue king crab, Pribilof Islands blue king crab, Pribilof Islands red king crab and..., Office of Sustainable Fisheries, National Marine Fisheries Service. BILLING CODE 3510-22-P ...

  8. Southeast Fishery-Independent Survey (PC1402, ME70)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Southeast Fishery-Independent Survey (SEFIS) was created by the National Marine Fisheries Service in 2010 and operates out of the NOAA Beaufort Laboratory. The...

  9. 78 FR 9373 - Pacific Fishery Management Council; Public Meeting

    Science.gov (United States)

    2013-02-08

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE... (NOAA), Commerce. ACTION: Notice; public meeting. SUMMARY: The Pacific Fishery Management Council's (Council) will hold a workshop on electronic monitoring in the rationalized groundfish trawl fishery. DATES...

  10. 77 FR 70419 - Caribbean Fishery Management Council; Public Meetings

    Science.gov (United States)

    2012-11-26

    .... Miguel A. Rol n, Executive Director, Caribbean Fishery Management Council, 268 Mu oz Rivera Avenue, Suite... contact Mr. Miguel A. Rol n, Executive Director, Caribbean Fishery Management Council, 268 Mu oz Rivera...

  11. 76 FR 56742 - Mid-Atlantic Fishery Management Council; Workshop

    Science.gov (United States)

    2011-09-14

    ...; Workshop AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce. ACTION: Notice of a workshop. SUMMARY: The Eight Regional Fishery Management Councils will convene a workshop of representatives of their respective Scientific and Statistical Committees...

  12. Southeast Fishery-Independent Survey (PC1204, ME70)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Southeast Fishery-Independent Survey (SEFIS) was created by the National Marine Fisheries Service in 2010 and operates out of the NOAA Beaufort Laboratory. The...

  13. Fishery Manangement Plan : Holla Bend National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This plan describes fishery management for Holla Bend National Wildlife Refuge in 1990. The plan outlines goals, objectives for fishery management for the benefit of...

  14. Fishery management plan: Morgan Brake National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This plan outlines goals and objectives recommended by the Service Fisheries Assistance program. The plan is to be used as a guide in managing the Refuge's fishery...

  15. Yukon Flats National Wildlife Refuge Fishery. Management Plan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Yukon Flats National Wildlife Refuge Fishery Management Plan (Fishery Plan) provides comprehensive management direction to insure that fish species and habitats...

  16. A fishery manager's guidebook: management measures and their application

    National Research Council Canada - National Science Library

    Cochrane, K. L

    2002-01-01

    ...: Fisheries management. It is intended primarily for the practising fishery manager and decision-maker, with particular emphasis on developing countries, although it is hoped that the volume will also be of interest...

  17. Fishery Management Plan : Ottawa National Wildlife Refuge Complex

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This Fishery Management Plan for Ottawa NWR provides an overview of the relationship between fishery management and Refuge objectives. Wildlife use and production...

  18. Incidental mortality of seabirds in selected commercial fisheries in Alaska

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Fishery-seabird observers monitored the incidental mortality of seabirds between 1989 and 1993 in three groundfish longline, trawl, and pot fisheries in the Bering...

  19. Southeast Fishery-Independent Survey (PC1304, ME70)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Southeast Fishery-Independent Survey (SEFIS) was created by the National Marine Fisheries Service in 2010 and operates out of the NOAA Beaufort Laboratory. The...

  20. Estructura de tallas y crecimiento de los cangrejos Callinectes arcuatus y C. bellicosus (Decapoda: Portunidae en la laguna costera Las Guásimas, México

    Directory of Open Access Journals (Sweden)

    Luis Hernández

    2007-03-01

    Full Text Available Presentamos información sobre la estructura de tallas, la relación ancho-peso y los parámetros de crecimiento de las jaibas Callinectes arcuatus y C. bellicosus. Las muestras fueron recolectadas mensualmente con una red de arrastre tipo camaronera durante el día y la noche desde marzo 1998 hasta febrero 2000 en una laguna costera del Golfo de California. C. bellicosus (n= 878 fue más abundante que C. arcuatus (n= 357 y su intervalo de talla de 8.4- 166 mm ancho del caparazón (AC y 9-130 mm AC, respectivamente. Ambas poblaciones son representadas principalmente por jóvenes (75 mm AC entre 37-75 mm AC y adultos entre 76- 90 mm AC. La relación ancho-peso mostró que los machos crecen más que las hembras en ambas especies y se observó una tendencia de crecimiento isométrico. Los parámetros de crecimiento para C. arcuatus estimados con el modelo von Bertalanffy fueron: K= 0.84 año-1, L∞= 140 a -0.12 mm para C. arcuatus, y K= 0.9 año -1, L∞= 169 a -0.11 mm para C. bellicosus. Estos resultados mostraron que la edad relativa a la cual se alcanza el crecimiento máximo es entre los tres y cuatro años de edad para ambas especies.Size frequency distribution and growth of the crabs Callinectes arcuatus and C. bellicosus (Decapoda: Portunidae in Las Guásimas coastal lagoon, Mexico. Information on size frequency distribution, the width-weight relation and growth parameters of the crabs Callinectes arcuatus and C. bellicosus is presented. The data comes from samples taken with a trawl net both day and night on a monthly basis from March 1998 to February 2000 in a coastal lagoon from Gulf of California. C. bellicosus (n= 878 was more abundant than C. arcuatus (n= 357 and its size frequency distribution presented carapace width CW ranges of 8.4-166 mm and 9-130 mm respectively. Both populations were mainly represented by juveniles (75 mm in CW ranging from 37 to 75 mm in CW, and adults (>75 mm in CW between 76 and 90 mm in CW. In both species