Dispersion and Liver Constituents of Red Sea Bream, Pagrus major, Released Into the Okiura Fishing Port on the Inland Sea of Japan.

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  • 沖浦港内へ放流したマダイの逸散と肝臓成分の変化

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Abstract

Red sea bream seeds from two different origins were released in Aug. 1992 into Okiura Fishing Port and fed by acousitc conditioning and ordinary artificial feeding until Dec. 1992. During this period, we surveyed the growth, dispersion, of as well as triglycerides (TG) and RNA/DNA ratio of the fish. A total of 2699 red sea bream were recaptured in 125 samplings with basket net. The numbers of individuals caught decreased steadily with time during periods (40 to 110 days after release) and 2 (110 to 135 days), but not in Period 0 (0 to 40 days) . Survival rates (S) were 98.3% (P1) and 93.3% (P2) . The dispersion rates (1 minus S) were 1.7% (P1) and 6.7% (P2) . Dispersion began when the temperature of water fell, red sea bream seeds were no longer recaptured at or below 15°C. The amount of TG in the liver decreased steadily from 3.3-4.6%at the time of release until 31-38 days after release. The rate of decrease, however, was smaller than when the seeds were directly released outside the fishing port. RNA/DNA ratio, which was 3.5 at the time of release and fell to 2.6-2.8 at 10 days after release, but recovered after the 17th day. Overall, it appears that release artificial feeding with in the port have no negative effects on redsea bream and that the seeds adapt well to the release site. Furthermore, the seeds successfully disperse to the outer waters. These results suggest that fishing port waters are an appropriate place for release of artificially propagated seeds.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (1), 129-135, 1995

    Japanese Society for Aquaculture Science

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