Methodological problems associated with assessing crab resources based on trap catch data

Methodological problems associated with assessing crab resources based on trap catch data

S.A. Nizyaev and S.D. Bukin

Methodological problems associated with assessing crab resources based on trap catch dataThis is part of Crabs in Cold Water Regions: Biology, Management, and Economics
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Description

At present, the use of trap data for estimating absolute abundance or biomass of crabs is limited by inability to quantify the relationship between trap catch rates and actual population density. The disadvantage of traps is the complex interacting effects of trap design and biological conditions on catchability of the study species by traps. Based on comparative experiments conducted to date on trawls versus various types of traps it is concluded that the current knowledge base is inadequate to allow application of trap catch rate data in absolute terms. Such data can be useful,however, in elucidating general distribution patterns and relative changes or variation in population density.

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