標識率法による東京湾北部のマハゼ資源量の推定

概要

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The tagged ratio method already introduced by the Author, was applied to the tag-recapture data of Japanese common goby, Acanthogobius flavimanus in the northern part of Tokyo bay, from 1955 to 1959. The results showed that the population size of this goby in the area were about 1 ?? 2 hundred millions at the period from middle of September to beginning of October, though of course there were some yearly variation. Otherwise, the results obtained by common PETERSEN method, based on the same data, were clearly overestimates, caused by the successive diminution of tags. The average value of weekly natural mortality coefficient, obtained by the tagged ratio method and BEVERTON method together, was about 0.0519 at the prime fishing season from middle of September to beginning of November in this area. Furthermore, 0.10 ?? 0.20 for the exploitation rate, (1×10-6 for the catchability coefficient), and 0.60 ?? 0.70 for the survival rate during same period, were calculated respectively.
公益社団法人日本水産学会の論文