東シナ海産クログチArgyrosomus nibeの再生産曲線について

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  • REPRODUCTIVE CURVE OF THE STOCK OF ARGY ROSOMUS NIBE, KUROGUCHI, IN THE EAST CHINA SEA
  • ヒガシシナ カイサン クログチ Argyrosomus nibe ノ サイセイサン キョクセン ニ ツイテ

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SAISHU, Kozo (Seikai Regional Fisheries Research Laboratory, Nagasaki) Reproductive curve of the stock of Argyrosomus nibe, Kuroguchi, in the east china sea. Jap.J.Ecol. 18,32-39 (1968). An analysis was carried out concerning the variation of the stock of A.nibe by comparing the fluctuation of the spawner to that of recruitment size using the catch and effort statistics with size category. The amount of the recruitment was then correlated with the temperature distribution of the nursery ground during the spawning and early developmental period of the preceding year. 1. The amount of stock of the present species varied chiefly depending on the size of the recruitment. The fluctuation of the size then seemed to be influenced by (1) the abundance of the dominant brood stock occurring with an interval of three years, and (2) the dimensions of the suitable habitat within the nursery ground, which affects the size of the brood stock. The periodical occurrence of the dominant brood stock coincided with the age of the earliest maturation, i.e. three years old. As an index of the environment, an attempt was made to set the isothermal area of habitat, 23°〜24℃ for a narrow and 22〜25℃ for a wide range, using the mean surface temperature of the nursery ground during the spawning period of a particular population. 2. The relation between the deviation of the recruitment size from the mean of the annual fluctuation and the index of the environmental factor (the size of the suitable isothermal area in the present case) indicates that the maximum and the minimum values of recruitment size proportional with the variation of the isothermal area despite the fact that the mean values were always constant regardless of the change of the isothermal area. Thus, there appeared to be a natural adjustment in size affected by the density of the population.

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