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首页> 外文期刊>ICES Journal of Marine Science >Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters
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Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters

机译：不同产卵成分对冰岛水域鳕鱼混养渔业的贡献

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摘要

Otolith chemistry and length-at-age were used to estimate the contribution of different spawning components to the harvested stock of cod (Gadus morhua) at two of their main feeding grounds northwest and east of Iceland. Spawning cod were sampled at different spawning locations around Iceland in spring of 2002 and 2003. Significant differences were detected between cod from the different spawning locations. Cod of unknown stock origin were also sampled at two of the main feeding grounds in October of the same years. Analyses based on maximum likelihood were used to estimate the proportion of each spawning group in the mixed stock catches using otolith chemistry and fish length-at-age. Attempts to use otolith shape to estimate the contribution of the spawning groups to the mixed harvested stock were, however, unsuccessful. The results indicated that spawning locations northwest and north of Iceland, as well as in water deeper than 125 m south of Iceland, contributed the most to the harvested stock. Cod spawning shallower than 125 m south of Iceland did not contribute to the feeding grounds in October of 2002 and 2003. Therefore, exploitation of the feeding stock mixtures seems to be based on spawning components that have previously been considered to be of minor importance to the Icelandic cod stock.
机译：耳石化学和成年期被用来估计不同产卵组分对它们在冰岛西北和东部两个主要觅食地的鳕鱼（加德斯·摩尔瓦）种群的贡献。 2002年和2003年春季，在冰岛附近不同产卵地点取样产卵鳕鱼。在不同产卵地点的鳕鱼之间发现了显着差异。同年10月，在两个主要饲养场也取样了未知来源的鳕鱼。使用耳石化学和鱼龄，使用基于最大可能性的分析来估计混合种群捕获中每个产卵组的比例。尝试使用耳石形状来估计产卵群体对混合收获种群的贡献是不成功的。结果表明，在冰岛西北和北部以及在冰岛以南125 m以下的水中产卵的地点对收获的种群贡献最大。在2002年和2003年10月，在冰岛以南不到125 m处产卵的鳕鱼没有成为饲养场的原因。因此，对饲料混合物的开采似乎是基于产卵成分的，以前这些产卵成分被认为对养殖场的重要性不大。冰岛鳕鱼存量。

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