Starvation Resistance of Seedlings of Barfin Flounder, Verasper moseri.

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  • マツカワ人工種苗の飢餓耐性
  • マツカワ ジンコウ シュビョウ ノ キガ タイセイ

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In order to determine the optimal release size of seedlings of barfin flounder, Veyasper moseri, the starvation resistance was examined at three developmental stages.<BR>During the starvation experiment, 50% mortality of the 50mm size group and the 80mm size group occurred by the 63rd day and 112th day, respectively. None of the 100mm size group died during the 120 days of the starvation experiment. These results indicate that seedlings of Barfin flounder can survive relatively long-term starvation and that larger sizes have higher survival rates.<BR>Morphometric changes in the condition factor (CF) and hepatopancreas somatic index (HSI) showed similar patterns; both values decreased significantly after 2 days of starvation for the 50mm and 80mm size groups. For the 100mm size group, the CF value decreased significantly after 10 days and the HSI value decreased significantly after 50 days.<BR>Significant decreases in the biochemical composition (protein, RNA/DNA and glycogen) in the youngest group were found on the second day of starvation. Although the RNA/DNA ratio of the 100mm size group decreased significantly on the 5th day of starvation, the protein and glycogen contents did not change throughout the experimental period. In the 80mm size group, the protein content did not decrease during the experiment, but the RNA/DNA ratio decreased significantly on the 5th day similar to the 100mm size group. Glycogen decreased on the second day as found in the 50mm size group.<BR>Judging from the changes in the biochemical composition, the higher survival rate in the larger size group may be due to a restraint mechanism of energy expenditure, which is developed in older juveniles.

Journal

  • Aquaculture Science

    Aquaculture Science 48 (3), 517-522, 2000

    Japanese Society for Aquaculture Science

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