成長差がベニザケの早熟雄とスモルトの発達に与える影響

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  • The Effects of Growth on Development of Precocious Male and Smolts in Sockeye Salmon

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The effects of alterations in growth on the incidence of precocious male maturation (PM) and seawater tolerance of sockeye salmon (Oncorhynchus nerka) were investigated. Juvenile sockeye salmon were separated into four groups (Groups A-D) and reared under different feeding regimes from November of age-0 to May of age-1. The growth regimes of groups A, B, C and D were the following: low growth throughout the duration, low from November to March and high from March to May, high from November to January and low from January to May, and high throughout the duration, respectively. The PM was determined by gonadosomatic index in May. Seawater tolerance was examined by monthly measurement of gill Na+, K+-ATPase (ATPase) activity. Proportions of PM among male fish of the groups A, B, C and D were approximately 0%, 50%, 80% and 80%, respectively. The ATPase activities of group-A remained consistently low, while that of the groups B, C and D was elevated significantly in April unrelated to differences of mean fork length and past growth. These results indicate that high growth in early winter of age-0 induces PM and consistent low growth during winter and spring hinders development of both seawater tolerance and smolt development.

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 507-513, 2007

    日本水産増殖学会

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