マイワシの生物学的指標に関する統計学的検討〔英文〕

概要

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This report examines the relationships between six biological indices (condition factor, fat weight ratio, gonad somatic index, body length, mean age, and sex ratio) of Japanese sardine, the sardine stock biomass, and the sea surface temperature in the Doto region. 11, 707 individuals were collected by purse seine in July ?? Oct. during the Years 1978 ?? 90. In terms of yearly biological indices, it became clear with statistical test that the gonad somatic index and indices except the sex ratio should be stratified sex-wise and age-or month-wise respectively. The relationships between the indices, the stock biomass, and the sea temperature was investigated with multiple regression analysis. The multiple regression equations of the indices were generally significant. The partial regression coefficients of variables in the regression equations indicated that the indices had negative and positive relationships to the stock biomass and the sea temperature respectively. In particular, the indices at 2 ?? 3 years of age and in October showed good consistency with the variation in the stock biomass and the sea temperature.
日本水産學會の論文