Metabolic changes in juvenile masu salmon during starvation and after release into the Iburibashi River in the Hokuriku region: An attempt to evaluate the nutritional condition of released fish using biochemical indices

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  • 絶食時および動橋川放流後のサクラマス幼魚の代謝変化：生化学指標による放流魚の栄養状態評価の試み

Abstract

<p>　The metabolic response of hatchery-reared juvenile masu salmon Oncorhynchus masou to prolonged starvation was examined in a rearing experiment. Moreover, the fish released into the Iburibashi River in autumn for stock enhancement were recaptured and their nutritional condition was biochemically evaluated. The hepatic glucose-6-phosphate dehydrogenase (G6PDH) activity and muscle triglyceride (TG) content of the starved fish were significantly lower than those of the fed fish, whereas the hepatic alanine transaminase (ALT) and muscle acid protease (AP) activities of the starved fish were significantly higher than those of the fed fish. These results indicate that hepatic lipogenesis was depressed and hepatic amino acid catabolism and muscle proteolysis were enhanced during starvation. In the release-recapture experiment, the recaptured fish had lower hepatic G6PDH activity and muscle TG content and higher hepatic ALT and muscle AP activities than the fish before the release. The nutritional condition of the recaptured fish was evaluated using a discriminant function constructed from the biochemical data of the rearing experiment. Sixty-nine percent of the recaptured fish were evaluated to be under the starvation condition. This result indicates that the nutritional condition of the released fish was considerably reduced in the river.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 89 (4), 338-344, 2023-07-15

    The Japanese Society of Fisheries Science

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