サケ・マスの放流効果に関する研究-2-給餌放流の効果について〔英文〕

概要

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After starting work on planting and feeding, it is found that the rate of return of chum salmon becomes larger. It is difficult, however, to judge the effect of the planting and feeding in a quantita-tive manner because of the following two reassons: 1) It is difficult to estimate the true rate of teturn, 2) The two methods of planting, planting, planting without feeding and planting and feeding, are used jointly. In this paper we developed further the theory of the previous paper. We estimated the rate of return, for each age, of the group of salmon under planting and feeding by the least square method. And we tried to estimate the effect of the planting and feeding. The rate of return was found to have increased four times due to the planting and feeding. It may be correct to imply that, the younger the fish the ratio of the rate of return with feeding to that without feeding becomes larger.
日本水産學會の論文