イサキ資源に関する研究-2-産卵期について

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For Isaki, Parapristipoma trilineatum, the spawning season and the gonad maturation have not been studied well. In this paper an analysis is presented for gonad index (GI) and the egg-diameter (D) of 694 specimens taken from the waters in the vicinity of Miura peninsula, Kanagawa Prefecture mostly in summer months of 1964-'67 seasons. Age is determined by the scale and it appears that the fish reaches maturity at age 3. The valuse of index (GI) of 3- and 4-year-olds are much larger than that of 2-year-olds (Table 2). Basing on the monthly change of GI and D (Figs. 1 and 2) and also condition of the gonad of the fish, the spawning season of the fish is estimated to be from mid-June to mid-August, having its peak in a period from mid-June to early July. D and GI show a linear relation with correlation coefficient γ=0.698.
社団法人日本水産学会の論文