Evaluation of the sample ratio of sublegal to legal male crabs used to predict harvest of Dungeness crab (Cancer magister) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r207tr72s

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  • The sample ratio of sublegal to legal male crabs retained in crab pots was used in calculations to predict future harvest of Dungeness crabs, Cancer magister, along the Oregon coast. Accurate predictions by this method require a sample ratio representative of the population ratio. I sampled the Oregon Dungeness crab population out of the ports of Astoria and Newport during the 1974-75 and 1975-76 crab seasons. Samples were taken with commercial crab pots modified to retain sublegal as well as legal crabs. My predictions of future harvest of Dungeness crab were inaccurate because the sample ratio was an inaccurate and biased estimator of the population ratio of sublegal to legal crabs. My results indicate that the samples obtained by my sampling gear and methods were not representative of the number of sublegal and legal crabs in the population. The sample ratio may be improved as an estimator of the population ratio by decreasing the time the modified crab pots are allowed to fish and by random sampling of the Dungeness crab population.
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