Journal of Shellfish Research 17:451–458.įishcler, K. History, management, status and trends in the Louisiana blue crab ( Callinectes sapidus) fishery in Georgia. Food and Agriculture Organization Yearbook. Marine Ecology Progress Series 76:249–260.įood and Agriculture Organization of the United Nations. Density, return frequency and feeding habits. Utilization of the intertidal zone of a salt marsh by the blue crab Callinectes sapidus. Transactions of the American Fisheries Society 94:287–310.įitz, H. The use of catch-effort, catch-sampling and tagging data to estimate a population of blue crabs. Journal of Shellfish Research 17:451–458.įischler, K. Conservation and management of the blue crab fishery in Georgia. Plant and Animal Populations: Methods in Demography. Transactions of the American Fisheries Society 128:1085–1105.Įbert, T. Catch and bycatch: The qualitative effects of fisheries on population vital rates of Atlantic croaker. Ecological Applications 4:437–445.ĭiamond, S. Predicting the impact of Turtle Excluder Devices on loggerhead sea turtle populations. A stage-based population model for loggerhead sea turtles and implications for conservation. American Fisheries Society Symposium 23:115–136.Ĭrouse, D. A stochastic stage-based population model of the sandbar shark in the western North Atlantic. Matrix Population Models: Construction, Analysis and Interpretation. Journal of Shellfish Research 17:487–491.Ĭaswell, H. New York's blue crab ( Callinectes sapidus) fisheries through the years. Management of the sandbar shark ( Carcharhinus plumbeus): Implications of a stage-based model. Pod-specific demography of killer whales ( Orcinus orca). When are there “two few” newborns in a small population of marine mammals? American Fisheries Society Symposium 23:107–114.īrault, S. The seasonal dynamics of the Chesapeake Bay ecosystem. Northwest Atlantic fisheries Organization, Serial Document SCR 82/VI/64. The Calculation of F 0.1: A Plea for Standardization. Reductions in other sectors of the fishery are also required to ensure sustainability.Īnthony, V. The model indicated that reductions in the winter dredge fishery would have a substantial role in ensuring the long-term sustainability of the population. The egg production realized by large adults was also shown to be an important regulatory process. Transitions to and from small age-1 crabs were shown to be important in regulating the overall dynamics of the population. This value is less than the current estimate of exploitation in Chesapeake Bay (0.9–1.1) indicating that the level of exploitation in this system needs to be reduced to avoid overfishing. If the natural mortality rate is estimated for a maximum life expectancy of 8 yr, this translates to moderate levels of exploitation (F<0.32). I developed a stage-based matrix model of the blue crab population to address three key questions: What is the ability of blue crab populations to support sustainable exploitations? What stages of the life cycle are most important in regulating the dynamics of the populations? And specific of the Chesapeake Bay, what is the importance of a winter dredge fishery in determining long-term sustainability of the crab population? The model indicated that with the current pattern of exploitation blue crab populations are able to sustain a total instantaneous mortality rate (Z)∼0.7. It supports a large commercial fishery in the United States with approximately one third of the landings taken from Chesapeake Bay. "Fisheries regulators and scientists must work quickly to identify the key ecosystem factors influencing blue crab recruitment and survival so that they can be mitigated to ensure a healthy blue crab population in the future," Moore said.Blue crab ( Callinectes sapidus) plays an important ecological and economic role in estuaries from South America to New England. The results "continue a worrying trend," Chesapeake Bay Foundation Senior Regional Ecosystem Scientist Chris Moore said in a statement. The department said it will work with Virginia and the Potomac River Fisheries Commission on management measures for the 2022 crabbing season that address conservation needs. The abundance of adult crabs has steadily declined despite meeting management objectives, officials said. While the survey's juvenile crab estimate rose to 101 million from 86 million last year, officials noted that the number is below average for the third year. The survey's highest estimate for crabs in the bay was 852 million in 1993. The Maryland Department of Natural Resources' annual winter dredge survey, a cooperative effort with the Virginia Institute of Marine Science, estimated that 227 million crabs are living in the nation's largest estuary, down from 282 million in 2021.
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