Population structure of blue sprat Spratelloides gracilis (Temminck et Schlegel) in Koshiki islands, southern Japan.

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  • 甑列島産キビナゴの個体群構造
  • コシキレットウサン キビナゴ ノ コタイグン コウゾウ

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Abstract

In this paper, yearly catches from 1975 to 1985, monthly catch statistics from 1984 to 1986, and biological characteristics in 1987 of the blue sprat Spratelloides gracilis (Temminck et Schlegel) were studied in Koshiki Is., southern Japan. Yearly catches ranged from about 400 to 700t, which accounted for 13-22% of total catch in Kagoshima Prefecture. Seasonal catches showed 2 fluctuations, i.e. one from spring to autumn with a peak in early summer, and the other from autumn to spring with a peak in late autumn. The former, having a higher peak, was composed exclusively of spawning adults, and the latter of immature young. Biological characteristics were different between the sexes: males are smaller in body size but larger both in coefficient of fatness and gonad index, and fewer in number than females.

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