短い時間スケ-ルにおける移出入係数の他の係数よりの卓越〔英文〕

概要

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Analyzing echo-sounding and experimental fishing data, Ohkawa and Misu have estimated the daily abundance of the Japanese anchovy Engraulis japonica in Yuya Bay. Using data of the abundance and commercial catch, and assuming the natural mortality coefficient, M. to be 5×10-8 s-1, this paper estimates magnitudes of the fishing mortality coefficient, F, and the immigration-emigration coefficient, I, for one or two days. Plots of |I| estimated by this and other papels vs. the time-scale, T, adopted in the respective papers show a relation, |1|=0.1/T to √10/T; due partly to offsets of positive and negative values of I for long T. Usually, both of Gi and M<10-7 s-1 where Gi is the individual growth coefficient; F<3×10-7 s-1. When T is shorter than five days or so, I should dominate over them.
日本水産學會の論文