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首页> 外文期刊>Fisheries Science >Predation dynamics of mackerel on larval and juvenile anchovy: is capture success linked to prey condition?
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Predation dynamics of mackerel on larval and juvenile anchovy: is capture success linked to prey condition?

机译：鲭鱼对幼体和幼鱼的捕食动态：捕获成功与猎物状况有关吗？

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摘要

We tested whether the predation dynamics of chub mackerel Scomber japonicus and spotted mackerel S. australasicus on young anchovy Engraulis japonicus relates to individual growth characteristics of the prey and could account for the growth-selective survival predicted by recruitment hypotheses. Juvenile and adult mackerel were sampled along with their young anchovy prey field in 2004 (juvenile mackerel and larval anchovy) and 2005 (adult mackerel and juvenile anchovy) off the Pacific coast of Honshu, Japan. The recent 5-day mean growth rate of larval and juvenile survivors and prey found in the stomach of mackerel was estimated from the otolith microstructure. No significant difference was found between the recent growth of larval or juvenile survivors and that of preyed individuals. We conclude that despite a relatively small body size, the high activity level and predation skills displayed by mackerel prevent fast-growing larvae and early juveniles from benefitting in terms of the expected survival advantage over slow-growers. Hence, growth-selective predation mortality of larval fish would depend on the feeding ecology of the predator rather than predator size. Selection for fast growth is more likely to occur under predation pressure from invertebrate organisms and small pelagic fish specialized on zooplankton, such as herring and anchovy.
机译：我们测试了鱼鲭鱼和斑节鲭鱼在幼小的an鱼En虾上的捕食动力学是否与猎物的个体生长特征有关，并且可以解释募集假说预测的选择性生长。在日本本州太平洋沿岸的2004年（少年鲭鱼和幼体an鱼）和2005年（成年鲭鱼和少年an鱼）中，对少年和成年鲭鱼及其幼小的young鱼捕捞场进行了采样。根据耳石的微结构，估计鲭鱼胃中幼虫和幼体幸存者及猎物的最近5天平均增长率。在幼虫或幼体幸存者的近期生长与被捕食个体的生长之间没有发现显着差异。我们得出的结论是，尽管体形相对较小，但鲭鱼表现出的高活动水平和捕食技能却阻止了快速生长的幼虫和早期幼虫从预期存活优势方面受益于慢速生长者。因此，幼鱼的选择性生长捕食死亡率将取决于捕食者的摄食生态而不是捕食者的大小。在无脊椎动物和专门捕捞浮游生物的小中上层鱼类（例如鲱鱼和cho鱼）的捕食压力下，更可能选择快速生长。

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