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首页> 外文期刊>ICES Journal of Marine Science >Pseudocollapse and rebuilding of North Sea mackerel (Scomber scombrus)
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Pseudocollapse and rebuilding of North Sea mackerel (Scomber scombrus)

机译：假塌陷和北海鲭鱼的重建（Scomber scombrus）

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摘要

The largest observed change in mackerel (Scomber scombrus) abundance in the North Atlantic happened when the so-called "North Sea mackerel" collapsed due to overfishing. Despite protection, it has remained in a depleted state. Central to this interpretation was that the "North Sea mackerel" was considered to be a distinct spawning component. However, a recent study has shown that this is not likely. In the light of this study, a review of the history of mackerel spawning in the North Sea found that the traditional explanation of the collapse did not account for a range of unfavourable environmental changes: high fishing pressure was followed by decreasing temperatures that reduced the spawning migration into the North Sea. This was further supplemented by unfavourable changes in food and wind-induced turbulence. On the population level, this was, therefore, not a local stock collapse, but a southwest shift in spawning distribution combined with a reduction in that portion of the population cline with an affinity for spawning in the northeastern part of the spawning area, including the North Sea. No indication of irreversible genetic or behavioural losses caused by the events was found. The previously unexplained lack of rebuilding of spawning in the North Sea consequently seems related to two environmental factors that have remained unfavourable: (ⅰ) zooplankton concentration, and (ⅱ) wind-induced turbulence. Furthermore, the large commercial autumn-winter fishery in the North Sea continues to land unknown quantities of mackerel that have an affinity for spawning in the northeastern part of the spawning area, including the North Sea.
机译：在北大西洋，鲭鱼（Scomber scombrus）丰度的最大变化发生在所谓的“北海鲭鱼”因过度捕捞而倒塌的时候。尽管受到保护，但它仍然处于枯竭状态。这种解释的核心是“北海鲭鱼”被认为是产卵的一个独特组成部分。但是，最近的一项研究表明这种可能性不大。根据这项研究，对北海鲭鱼产卵的历史进行了回顾，发现对塌陷的传统解释并没有说明一系列不利的环境变化：较高的捕鱼压力后，温度降低，使产卵减少迁移到北海。食物和风引起的湍流的不利变化进一步补充了这一点。因此，在种群水平上，这不是局部种群减少，而是产卵分布向西南方向移动，再加上该种群的那一部分减少，从而有可能在产卵区东北部（包括北海。没有发现由事件引起的不可逆的遗传或行为损失的迹象。因此，以前无法解释的缺乏北海产卵重建的原因似乎与仍然不利的两个环境因素有关：（ⅰ）浮游生物集中，以及（ⅱ）风引起的湍流。此外，北海的大型商业秋冬渔业继续在未知数量的鲭鱼上着陆，这些鲭鱼对产卵区东北部（包括北海）的产卵有亲和力。

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