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首页> 外文期刊>ICES Journal of Marine Science >Herring submesoscale dynamics through a major spawning wave: duration, abundance fluctuation, distribution, and schooling
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Herring submesoscale dynamics through a major spawning wave: duration, abundance fluctuation, distribution, and schooling

机译：通过主要产卵波产生的亚中尺度动态：持续时间，丰度波动，分布和学习

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摘要

In this study, a series of 17 repeated acoustic trawl surveys within a ca. 1500 km(2) area covering the major spawning location for Norwegian spring-spawning herring (Clupea harengus) was conducted over a period of about 1 month. Local herring abundance increased from ca. 25 000 to 237 000 t, a significant proportion of the total spawning stock, in just 3 d and subsequently decreased to< 30 000 t over the next 7 d. The abundance change was due to a single major spawning wave developing over the observation period, and an estimated 46 000 t of eggs and milt were deposited during the short time spent at the spawning ground. There was no difference in spawning activity between day and night, but herring were more associated with deep trenches and also generally stayed deeper in more dense schools during daylight than night-time. Schooling behaviour and distribution were also strongly state-dependent, and both school swimming depth and school height decreased as spawning progressed, as did the bottom depth where the schools were located. The massive herring spawning events seem to be low-risk adaptations to an environment where predators are abundant, with rapid spawning in huge aggregations as a strategy for predator swamping.
机译：在这项研究中，在一个ca内进行了17次重复的声学拖网调查。在大约1个月的时间内进行了1500 km（2）的区域，覆盖了挪威春季产卵鲱鱼的主要产卵地点。本地鲱鱼的丰度从ca开始增加。在短短3 d内就达到了25 000 to 237 000 t，占总产卵量的很大一部分，随后在接下来的7 d内下降到<30 000 t。丰度变化是由于在观察期内形成了一个主要的产卵波，在产卵场度过的短时间内，估计沉积了46 000吨卵和鱼mi。昼夜之间的产卵活动没有差异，但是鲱鱼与较深的trench沟相关，并且通常在白天比夜间在更密集的学校中停留更深。学校的行为和分布也强烈依赖于国家，并且随着产卵的进展，学校的游泳深度和学校的高度都下降了，学校所在的底部深度也下降了。大规模的鲱鱼产卵事件似乎是对捕食者丰富的环境的低风险适应，以巨大的聚集体快速产卵作为捕食者沼泽的一种策略。

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