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首页> 外文期刊>ICES Journal of Marine Science >Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea
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Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea

机译：北海大西洋鳕鱼（Gadus morhua）的产卵场

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The protection of spawning fish from anthropogenic impacts requires information on the location, timing, and interannual persistence of spawning aggregations. In this study, generalized additive models were used to predict the spawning habitat of North Sea cod, based on the abundance of spawning fish within three population subareas and nine environmental layers. The length of spawning cod differed among population subareas, consistent with published evidence of maturation differences. In the northeast North Sea (Viking), the peak in the spawning season was estimated to occur after the survey which made the prediction of spawning grounds for this area less certain. Cod were found to prefer areas with temperatures around 5-7 degrees C for spawning and there was a general preference for high salinity waters. Persistence of cod spawning grounds over the study period was related to interannual stability in temperature, with high variability in the use of Southern Bight spawning grounds. As such, cod appear to minimize interannual variability in the initial environmental conditions affecting offspring survival by selecting suitable cold spawning grounds. Seabed conditions also affected spawning distribution with cod selecting coarse sand and avoiding areas of very high tidal flow. The model prediction was compared with the distribution of cod aggregations during the spawning season reported by fishing boats. Seventy per cent of the aggregations was located in areas classified as occasional or recurrent spawning grounds. The predicted distribution confirmed the widespread occurrence of spawning in the North Sea and showed good agreement with recent and past studies of cod egg distribution, suggesting that nearly all major historical areas of spawning still appear in use today. However, the study also found that the recent recovery of spawning-stock biomass was not uniform across the stock, being centred in the northwest subarea.
机译：要保护产卵鱼类免受人为影响，就需要有关产卵聚集体的位置，时间和年际持久性的信息。在这项研究中，基于三个种群子区域和九个环境层中产卵鱼类的丰度，使用广义加性模型来预测北海鳕鱼的产卵栖息地。种群分区之间产卵鳕鱼的长度不同，这与已发表的成熟度差异一致。在北海东北部（维京），产卵季节的高峰估计是在调查之后发生的，这使得对该地区产卵场的预测变得不确定。人们发现鳕鱼更喜欢产卵温度在5-7摄氏度左右的区域，并且普遍偏爱高盐度水域。研究期间鳕鱼产卵场的持续存在与温度的年际稳定性有关，Southern Bight产卵场的使用变化很大。因此，鳕鱼似乎通过选择合适的冷产卵场而在影响后代生存的初始环境条件下使年际变化最小化。海底条件也影响鳕鱼的产卵分布，鳕鱼选择粗糙的沙子并避开潮汐流量很高的区域。将模型预测与渔船报告的产卵季节鳕鱼聚集的分布进行了比较。聚集的百分之七十位于偶尔或经常产卵场。预测的分布证实了北海产卵的广泛发生，并与近期和过去对鳕鱼卵分布的研究显示出良好的一致性，这表明今天几乎所有主要的产卵历史区域仍在使用。但是，研究还发现，最近的产卵生物量回收在整个种群中并不均匀，主要集中在西北分区。

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