Effects of a Salty Diet on Growth and Osmoregulatory Ability of Sockeye Salmon, Oncorhynchus nerka, in Sea Water.

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  • 食塩強化飼料がベニザケ，Ｏｎｃｏｒｈｙｎｃｈｕｓ　ｎｅｒｋａの海水移行後の浸透圧調節および成長に与える影響

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Abstract

The sockeye salmon (Oncorhynchus nerka) were fed with a salty diet (commercial trout pellets supplemented with 10% NaCl by weight) or commercial trout pellets for 21 days in fresh water (FW) and transferred directly to seawater (SW) . In SW, both groups were fed with the commercial pellets. Twenty four hours after the transfer to SW, the fish which had been fed with the salty diet showed significantly lower serum sodium levels than control fish. Moreover, these fish exhibited greater increases in fork length and body weight than control fish after 1 month in SW. These beneficial effects of salty-diet treatment disappeared, however, when the salty diet was withdrawn more than 1 month before transfer to SW. These data suggest that the treatment with salty diet for 21 days prior to transfer to SW promotes the development of hypoosmoregulatory ability and enhances fish growth in SW. However, these effects disappear within 1 month after the salty-diet treatment.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (3), 377-380, 1995

    Japanese Society for Aquaculture Science

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