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Showing 1 to 20 of 21 for “"blue crabs"”.
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Effects of Temperature on Growth and Molting in Blue Crabs (Callinectes Sapidus) and Lesser Blue Crabs (<i>Callinectes similis</i>)
… per molt (GPM) in many crustaceans, including blue crabs. Field surveys suggest that blue crabs reach maturity at larger sizes in cooler areas, and at smaller sizes in warm areas. In this study I investigate the effect of temperature on the growth process in blue crabs <em>Callinectes …
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Abundance and Distribution of Early Life Stage Blue Crabs (Callinectes sapidus) in Lake Pontchartrain
… variation in the abundance of early life stage blue crabs (Callinectes sapidus). Collections were made using a 1 m2 throw trap and data showed that C. sapidus numbers varied over time and among sites. Two recruitment events occurred during the study. During the first recruitment in May-June, C. …
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The Effect of the Chemical Composition of Low Salinity Water on the Growth, Development, and Survival of Cultured Juvenile Blue Crabs
<p>Cultured juvenile blue crabs ( Callinectes sapidus Rathbun) were held for up to 77 days and monitored for survival, growth and development in low salinity water containing various compositions of ions. ~rabs were isolated in separate containers and placed in thirty gallon aquaria containing 2ppt …
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Function and diversity of the Ship, Trinity, and Tiger Shoal Complex, with emphasis on macrofauna and spawning blue crabs (Callinectes sapidus)
… water hypoxia, and functioning as offshore blue crab (Callinectes sapidus) spawning grounds. I discovered unexpectedly high concentrations of spawning female blue crabs, greatly expanding what was previously understood about blue crab reproductive migrations. Blue crab abundances were …
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Regional Variation in Migratory Behavior and Reproductive Output of The Gulf Of Mexico Blue Crab Spawning Stock
… understand the structure and boundaries of the blue crab stock(s) in the Gulf of Mexico, focusing on large-scale movements of spawning female crabs. Because spawning location is a primary determinant of larval transport pathways, understanding spawning locations and offshore movements of female …
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Linkages between Marsh Fragmentation, Prey Availability, and Blue Crab (<i>Callinectes sapidus</i>) Abundance and Mortality
… establishment in newly created open water areas. Blue crabs, <em>Callinectes sapidus</em>, use both marsh edge and SAV habitat during the juvenile stages and support one of the largest fisheries in the Gulf of Mexico, worth over $70 million in 2015. This thesis studied the linkages between habitat …
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Enhanced Blue Crab Predation on Rangia Clams after Exposure to Hypoxia
… (Rangia cuneata) are not found within this zone. Blue crabs (Callinectes sapidus) are important estuarine predators and may move in and out of the hypoxic zone to feed on hypoxia-stressed rangia clams. To test the effects of hypoxia on predation, rangia clams were exposed experimentally to severe …
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Quantifying Discard Mortality of Undersized and Ovigerous Crabs in the Gulf of Mexico Blue Crab Fishery
<p>Blue crabs support a valuable commercial fishery in the Gulf of Mexico. Most states require the release of undersized and ovigerous blue crabs, yet mortality of these discarded crabs is an understudied component of total mortality. The first objective of this project was to quantify discard …
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Isolation of the 2019 Bonnet Carré Spillway Effects on the Habitat Suitability of Brown Shrimp (Farfantepenaeus aztecus) and Blue Crab (Callinectes sapidus) Using a Modeling Approach
… <em>SxT</em>) The results for brown shrimp and blue crabs indicated that there was a consistent significant impact from BCS outflows in response to salinity across all age classes and all critical ecological periods, while impacts in response temperature were more variable, with significantly …
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Waves of communication: Metabolomics describe the nature and role of waterborne cues in the marine environment
… of a fear-inducing cue released by predatory blue crabs and that is utilized by prey crabs to detect their predators was described. Additionally, allelopathic phytoplankton were fingerprinted based on their exometabolomes, and the metabolic consequences of allelopathy on competitors were …
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Sub-Lethal Effects of Hypoxia/Hypercapnia on Callinectes Sapidus in the York River Estuary, Virginia
… examined effects of hypoxic environments on blue crabs, Callinectes sapidus in an estuarine environment. Hypoxic conditions were treated as a multiple stressor involving low dissolved oxygen (D.O.), increased carbon dioxide (hypercapnia), and low pH concurrently. The objectives were to: 1) …
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Ecotoxicology of Natural and Anthropogenic Extreme Environments
… stress biomarkers in endemic molluscs and crabs from two natural extreme environments: deep-sea hydrothermal vents in the Lau and North Fiji Basin, and cold seeps in the Gulf of Mexico. In addition, the acute toxicity and sub-lethal effects of four insecticides and an herbicide are examined …
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Exploring the Interface Between Macroorganisms and Microorganisms: Biochemical, Ecological, and Evolutionary Contexts
… secretions are explored for barnacles, fiddler crabs and blue crabs. Fluids of interest were secretions released during barnacle settlement and metamorphosis and those collected from living adult barnacles, fluids on fiddler crab sensory appendages including dactyl washings and buccal …
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A Model of the Population Dynamics of the Blue Crab in Chesapeake Bay
<p>This study has particular application to the blue crab fisheries in Chesapeake Bay, an economically important industry whose successful management has been hindered by relatively poor understanding of the population dynamics. Recent biological studies have indicated a systematic spawning …
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Nutrient Controls Over Cyanobacterial Synthesis of the Neurotoxin β-N-Methylamino-L-Alanine (BMAA) and Its Potential Accumulation in the Blue Crab (<i>Callinectes Sapidus</i>)
… cyanobacterial populations were producing BMAA. Blue crabs were also collected from the upper Maryland and lower Virginia Chesapeake Bay during the summer of 2018 to examine BMAA bioaccumulation in the stomach, hepatopancreas, and muscle tissues of these important benthic consumers. …
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Detection, activity and resistance to thermal inactivation of peroxidase in the blue crab (Callinectes sapidus)
… claw and flake meat of both male and female blue crabs was determined spectrophotometrically. Activity was greatest in the flake and least in the claw. Male crabs usually exhibited a greater initial activity (λ 0D 460/min) than did females of equal size. The larger the crab for a given sex, …
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Anaerobic/aerobic pretreatment of blue crab (Callinectes sapidus) cooker wastewater
Wastewater from the pressure cooking of blue crabs presents a difficult treatment challenge. COD concentrations in the range of 15,000 to 30,000 mg/L are found in this wastewater, with TKN concentrations above 2,000 mg/L. Direct discharge of the wastewater, which is currently allowed, adds …
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EVALUATING HABITAT USE BY NEKTON IN WIDGEON GRASS (RUPPIA MARITIMA), SHOAL GRASS (HALODULE WRIGHTII), AND UNVEGETATED BOTTOM HABITATS IN THE GRAND BAY NATIONAL ESTUARINE RESEARCH RESERVE
… commercially fished nekton species including blue crabs (<em>Callinectes sapidus</em>), white shrimp (<em>Penaeus setiferus),</em> and brown shrimp (<em>Penaeus aztecus</em>) were collected, with higher densities and greater species diversity in seagrass beds compared to unvegetated bottom. …
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Changing Fecundity and Reproductive Output in Females of a Chesapeake Bay Population of Blue Crab, <i>Callinectes sapidus</i>
<p>The Chesapeake Bay blue crab, <em>Callinectes sapidus</em>, is an important species both ecologically and as a fishery. Fishery dependent and independent data indicate that the population declined abruptly in the mid-1990s and has remained low. Previous work prior to the decline in population …
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