三陸地方南部の河川におけるサクラマス雌の降海型と河川残留型の成長様式に関する数理的検討

概要

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In order to identify phase differentiation of masu salmon females into sea-run and fluviatile forms, growth formulae of the two forms were obtained and their growth patterns were compared. The basic and modified types of the three growth formulae, von Bertalanffy, Gompertz, and Logistic, were calculated by the nonlinear least squares method using fork lengths by month of age until the sea-ward migration season. On the basis of the AIC values, the modified models to which periodi-cal changes were introduced showed a better fit than the basic formulae. The best fitting formulae were Gompertz, wherein the growth rate changes in one and three cycles annually for the two forms. In summer, the growth rate of the fluviatile form was greater than that of the sea-run form. From autumn through winter, no marked difference in growth rate existed between them. Initial growth, and the maturation and smoltification processes all seemed to participate in the differences in growth pattern between the two forms.
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