We model the population of the Blue Crab in the Chesapeake Bay by using differential equations. Blue crabs are inherently cannibalistic of juveniles, while also in competition with juvenile blue crabs for resources. These differential equations describe the intraguild predation consistent in the blue crab food web, as well as the cannibalistic nature of the blue crab. We introduce an aging and ...

The intertidal snail Littorina saxatilis has repeatedly evolved two parallel ecotypes assumed to be wave adapted and predatory shore crab adapted, but the magnitude and targets of predator-driven selection are unknown. In Spain, a small, wave ecotype with a large aperture from the lower shore and a large, thick-shelled crab ecotype from the upper shore meet in the mid-shore and show partial siz...

Within the European Union, scientific fisheries research and advice is passed down a chain of central European institutions before being incorporated into policy. However, advice is often poorly or only partially implemented and the system has largely failed to achieve sustainable fisheries management. This paper aims to explain why, by examining the use of fisheries science within the Common F...

the study examined relationship between the gross domestic product (gdp) of nigeria with the inputs of labour, capital and the output of fisheries. this is to ascertain that the fisheries contribution to the economy is more than is recorded in the sense that taking its indirect and direct economic impact into account, its overall contribution to the gdp of nigeria may be higher than that measur...

AIM The objective of the study was to isolate and characterize pathogenic Vibrio parahaemolyticus from crustacean shellfishes (crab and shrimp) commonly retailed in coastal parts of eastern India. MATERIALS AND METHODS Samples were processed by bacteriological isolation followed by biochemical characterization in Kaper's medium. Presumptively identified isolates were confirmed by species-spec...

The digestive physiology and stomach contents of six crab species from a variety of habitats were investigated to provide an indication of their digestive capability and dietary preferences. Stomach contents varied between species, but the key enzymes present were generally consistent with the types of dietary material being ingested. Nectocarcinus integrifons (red rock crab) consumed large qua...

The groundfish complex is the most abundant fisheries resource off Alaska, with a combined biomass of more than 21.8 million metric tons (t). About 76% of the biomass is found in the Bering Sea and Aleutian Islands region, with the remainder in the Gulf of Alaska. From 2004 to 2006, groundfish catches averaged nearly 2.2 million t or about 10% of the total groundfish biomass, although harvest r...

Fisheries observers can both collect scientific data and report on compliance with fisheries regulations. Observers are used only for scientific purposes in most US fisheries. However, North Pacific groundfish fisheries observers are required to report violations of fisheries regulations that they witness. Based on evaluation of historical enforcement incidents and survey data, this paper consi...