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首页> 外文期刊>ICES Journal of Marine Science >Searching for Atlantic cod (Gadus morhua) spawning sites in the northwest Gulf of St Lawrence (Canada) using molecular techniques
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Searching for Atlantic cod (Gadus morhua) spawning sites in the northwest Gulf of St Lawrence (Canada) using molecular techniques

机译：使用分子技术搜索圣劳伦斯湾西北部（加拿大）的大西洋鳕（Gadus morhua）产卵场

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摘要

The overexploitation of Atlantic cod (Cadus morhua) in the Northwest Atlantic led to the collapse of most stocks and the demise of spawning components in the early 1990s. In the northern Gulf of St Lawrence, the spawning component of Northwest Atlantic Fishery Organization Division 4S was believed no longer to exist after the collapse. To verify this hypothesis, we used molecular techniques to identify cod, haddock, and witch flounder (CHW) eggs precisely, in an attempt to locate the potential remaining spawning sites for cod in the northwest Gulf. Ichthyoplankton surveys were conducted in spring from 2005 to 2008. Results were compared with those of surveys that took place in spring in the same area 20 years earlier to determine if there had been any changes in spawning location and egg abundance. Atlantic cod made up the majority (97%) of CHW eggs identified. The presence of stage I cod eggs proved that there is still a cod spawning component in the northwest Gulf of St Lawrence, but egg abundance has declined by about an order of magnitude compared with the 1980s. There was no obvious difference in the location of cod spawning grounds between the two decades.
机译：在1990年代初期，西北大西洋对大西洋鳕（Cadus morhua）的过度开发导致大多数种群的崩溃和产卵组件的灭绝。据信，在圣劳伦斯湾北部，西北大西洋渔业组织第4S分部的产卵部分在坍塌后不再存在。为了验证这一假设，我们使用分子技术精确地识别了鳕鱼，黑线鳕和比目鱼（CHW）卵，以试图找到西北海湾中鳕鱼潜在的产卵场。鱼类浮游动物调查于2005年至2008年春季进行。将结果与20年前春季在同一地区进行的调查结果进行比较，以确定产卵位置和卵的丰度是否有变化。大西洋鳕鱼占所鉴定的CHW鸡蛋的大部分（97％）。第一阶段的鳕鱼卵的存在证明了圣劳伦斯湾西北部仍然有一个鳕鱼产卵部分，但是与1980年代相比，卵的丰度下降了大约一个数量级。在这两个十年之间，鳕鱼产卵场的位置没有明显差异。

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