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首页> 外文期刊>Transactions of the American Fisheries Society >SIZE-DEPENDENT EFFECTS OF CONTINUOUS AND INTERMITTENT FEEDING ON STARVATION TIME AND MASS LOSS IN STARVING YELLOW PERCH LARVAE AND JUVENILES
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SIZE-DEPENDENT EFFECTS OF CONTINUOUS AND INTERMITTENT FEEDING ON STARVATION TIME AND MASS LOSS IN STARVING YELLOW PERCH LARVAE AND JUVENILES

机译：饥饿和黄体幼鱼和幼鱼饥饿和间歇喂食对大小和时间的影响

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摘要

Starvation rates of fish larvae living in patchy prey environments can have an important impact on cohort survival and recruitment. Despite this, little is known about how fluctuations in feeding experience influence starvation resistance and how this changes with ontogeny. Fish previously exposed to fluctuating food densities may not respond to long periods without food in the same way as fish previously exposed to a constant prey density. In a series of laboratory experiments with larvae and juveniles of yellow perch Perca flavescens, we tested the effects of continuous and intermittent feeding on times to starvation and on mass loss up to death from starvation for fish with initial total lengths of 10, 15, and 20 mm. Results indicated that proportional mass loss up to starvation was independent of fish mass, but that it did depend on feeding history. Fish that fed continuously before starvation all died after losing the same proportion of body mass (55%), but intermittent feeders died when they were slightly heavier (51-46% of body mass lost). Times to 50% mortality followed a different pattern; there was no significant difference in times to 50% mortality for fish that had fed continuously or intermittently for the same number of days before starvation. We conclude that short-term fluctuations (less than or equal to 4 d) in food availability do not appear to affect times to starvation but do influence mass loss during starvation in young yellow perch.
机译：生活在斑驳的猎物环境中的鱼幼虫的饥饿率可能对队列的生存和募集产生重要影响。尽管如此，人们对喂养经历的波动如何影响饥饿抵抗以及其如何随个体发生的变化知之甚少。先前暴露于波动的食物密度的鱼类可能没有长时间的食物响应，就像先前暴露于恒定猎物密度的鱼类一样。在一系列针对幼体和黄鲈Perca flavescens的幼虫的实验室实验中，我们测试了连续和间歇进食对初始总长度为10、15和15的鱼的饥饿时间和饥饿导致的质量损失直至死亡的影响。 20毫米结果表明，直至饥饿为止的成比例的质量损失与鱼的质量无关，但它确实取决于取食的历史。在饥饿前连续喂食的鱼在失去相同比例的体重（55％）后全部死亡，但间歇性喂食者在体重稍重时会死亡（损失51-46％）。死亡率达到50％的时间遵循不同的模式。在饥饿之前连续或间断饲喂相同天数的鱼，死亡率达到50％的时间没有显着差异。我们得出的结论是，食物供应量的短期波动（小于或等于4 d）似乎并不影响饥饿时间，但确实会影响幼小的黄色鲈鱼饥饿期间的质量损失。

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