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首页> 外文期刊>Journal of Fish Biology >Post-release feeding and growth of hatchery-reared Japanese flounder Paralichthys olivaceus: relevance to stocking effectiveness
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Post-release feeding and growth of hatchery-reared Japanese flounder Paralichthys olivaceus: relevance to stocking effectiveness

机译：孵化场饲养的日本比目鱼（Paraliichthys olivaceus）的释放后喂养和生长：与放养效果的关系

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摘要

The feeding and growth of hatchery-reared (HR) Japanese flounder Paralichthys olivaceus of c. 100 mm total length (L-T) released off the coast of Fukushima, Japan, were investigated. From 2 to 15 days after release, the HR P. olivaceus frequently exhibited high empty-stomach frequency (>40%), low stomach-content mass (<1% of body mass), reduced somatic condition from release (c. -10%) and negligible growth. Thereafter, empty-stomach frequency decreased, the stomach-content mass of HR fish increased to 2-8% of body mass, the somatic condition recovered and growth rate increased to 0.5-1.5 mm day(-1). Prey items were initially mysids, shifting thereafter to fishes such as the Japanese anchovy Engraulis japonica, as observed similarly in wild counterparts. The proportion of mysids decreased with time after release irrespective of size at release, indicating the importance of mysids for adaptation to natural food. Recapture rates at age 1 year, derived from fish market surveys, varied greatly among release years (4-11%). The variation in the recapture rates was largely accounted for by the post-release growth rates (r(2) = 0.5), suggesting a relationship between the post-release growth of HR fish and their survival and subsequent stocking effectiveness
机译：孵化场（HR）日本比目鱼Paralichthys olivaceus的摄食和生长。对日本福岛沿岸释放的100毫米总长（L-T）进行了调查。释放后2到15天，少儿HR P. vacvacs经常表现出高的空腹频率（> 40％），低的胃内容物质量（<1％体重），释放后的体细胞状况减轻（c。-10） ％）和微不足道的增长。此后，空腹频率降低，HR鱼的胃内容量增加到体重的2-8％，体细胞状况得到恢复，生长速率增加到0.5-1.5 mm日（-1）。猎物最初是类麻痹，后来转移到鱼类，例如日本an鱼Engraulis japonica，在野生动物中也类似。释放后的大小，不论其大小如何，类固醇的比例均随时间降低，这表明类固醇对适应天然食品的重要性。根据鱼类市场调查得出的1岁年龄段的捕获率在释放年份之间差异很大（4-11％）。捕获率的变化在很大程度上是由释放后的增长率所解释的（r（2）= 0.5），这表明HR鱼的释放后的生长与其生存和随后的放养效率之间存在关系。

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