島根県紙祖川に生息するゴギの資源状態

概要

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This report is on the status of gogi-char Salvelinus leucomaenis imbrius stock in Shiso River, a tributary of Hikimi River in Shimane Prefecture. In this study, annual natural and fishing mortality coefficients of gogi-char have been estimated as 0.9322 and 0.7808 respectively by the average age method. Its longevity is six years. The adult stock of gogi-char is between about 22 and 54 percent of its virgin stock. However, a population analysis has made it clear that gogi-char is slightly overfished.
日本水産學會の論文