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首页> 外文期刊>Marine biology >Residency and depth movements of a coastal group of Atlantic cod (Gadus morhua L.)
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Residency and depth movements of a coastal group of Atlantic cod (Gadus morhua L.)

机译：大西洋鳕鱼（Gadus morhua L.）沿海群的居住和深度运动

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Atlantic cod stocks are subdivided into geographically and biologically discrete populations; some being locally resident, others migratory. The reasons for the variation in migration pattern and the consequences it may have for population structuring is poorly understood. We studied a group of cod from the coastal waters of the Shetland Isles in the northern North Sea. During the spawning season, electronic tags that record depth and temperature over time were implanted into 133 individuals and the fish released within a few kilometres of where they were captured. Thirty-nine cod have been recaptured up to 608 days later, throughout the year and, in all but two cases, within 15 km of their release site. Geolocation methods based on temperature and bathymetry also suggested that the cod had a limited home range, remaining resident year-round in coastal waters. The cod were deeper during the winter and moved to shallower water in late spring and summer. They showed diel, fortnightly and monthly cycles in depth movement that varied much within and between individuals over the season. Residency and the individual variability in vertical movement may reflect a combination of locally complex depth strata, variable seabed substrate and the wide range of seasonally available prey resources.
机译：大西洋鳕鱼种群细分为地理和生物学上分散的种群；有些是当地居民，有些是移民。人们对迁移模式变化的原因及其可能对人口结构造成的影响了解甚少。我们研究了北海北部设得兰群岛沿海水域中的一组鳕鱼。在产卵季节，将随时间推移记录深度和温度的电子标签植入了133个个体中，并在捕获它们的几公里内释放了鱼。全年共捕捞了39只鳕鱼，直至608天，除两个案例外，其余全部在捕捞地点15公里以内。基于温度和测深法的地理定位方法还表明，鳕鱼的家园范围有限，常年居住在沿海水域。鳕鱼在冬季较深，在春季末和夏季移至较浅的水中。他们显示深度运动的diel，每两周和每月的周期在整个季节内和个体之间变化很大。居住和垂直运动的个体差异可能反映了局部复杂的深度地层，可变的海床底物和广泛的季节性猎物资源的组合。

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