Results of Dover Sole tagging in waters off Northern California, 1969-1971

Quirollo, Lawrence F. and Kalvass, Peter (1987) Results of Dover Sole tagging in waters off Northern California, 1969-1971. Eureka, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administrative Report, 87-4)

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Abstract

Three seasonal trawl tagging cruises were undertaken by the California Department of Fish and Game between 1969 and 1971 to determine the distribution, abundance and stock identity of Dover sole (Microstomus pacificus)in the area between Cape Mendocino in northern California and Cape Blanco in southern Oregon. A total of 4730 Dover sole was tagged and released. Through 1984 26% (1235) were recovered. Recapture rates from the tagging cruises were 32% for the spring cruise, 28% for fall, and 15% for winter. Only 13 of 1235 tags were recaptured outside of PMFC 2A and 1C areas (Cape Blanco to Cape Mendocino). The mean north-south dispersion of tagged Dover sole from point of release was 10.2 nautical miles (nm). The maximum distances moved from tagging sites were 215 nm southward and 211 nm northward. A stock unique for management purposes is indicated by the tag recoveries. A seasonal migration by female Dover sole to deep-water grounds in fall and winter was demonstrated. Several estimates of total mortality (Z) were generated by regression of recoveries on time-at-liberty for all recoveries and for shallow- and deep-water returns, separately. Values were 0.41, 0.61, and 0.31, respectively. (84pp.)

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