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首页> 外文会议> >Preliminary studies on silver hake (Merluccius bilinearis) population identification using microsatellite DNA along the Northeastern US coast and their abundance correlated with bottom water temperatures in the Middle Atlantic Bight
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Preliminary studies on silver hake (Merluccius bilinearis) population identification using microsatellite DNA along the Northeastern US coast and their abundance correlated with bottom water temperatures in the Middle Atlantic Bight

机译：利用美国东北沿海微卫星DNA识别无须鳕（Merluccius bilinearis）种群的初步研究，其丰度与中大西洋海底的底水温度相关

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Silver hake, or whiting, populations appear to be declining in the Middle Atlantic Bight off the east coast of the United States as judged from Government research vessel data, recorded landings and anecdotal evidence provided by the commercial fishing fleet. There is some evidence that this may be due to overfishing. If true, it may necessitate additional governmental regulation of this fishery. However, with a migratory species such as silver hake, an alternative interpretation of the declining landings may be that the stocks have relocated from traditional fishing areas in the Middle Atlantic Bight in response to changing environmental factors such as changes in bottom temperatures and others. Moreover, since little is known of the population structure of the silver hake stock, it is difficult to analyze if the overall stock is in decline or only certain populations. Such information will be needed to develop effective management strategies. We are currently investigating the decline of silver hake populations by reviewing National Marine Fisheries Service (NMFS) research data collected from the 1960s-1990s looking for correlations between changes in the environment and declines in catch. Such correlations may favor relocation of the stock, as opposed to overfishing, to explain the recorded declines in landings. In addition, we are collecting blood samples from the Gulf of Maine southward to the Middle Atlantic Bight in order to prepare DNA for microsatellite DNA analysis to determine the silver hake population structure. We believe that the population structure as determined by microsatellite DNA analysis, together with correlations between catch and environmental factors, will provide valuable information for the development of effective fisheries management plans for the silver hake stock. Preliminary microsatellite DNA data analyses suggest that there may be more than one silver hake population. Also, preliminary analysis of bottom water temperatures in the Middle Atlantic Bight appears to indicate an average rise in temperature over the three decades investigated.
机译：根据政府研究船的数据，记录的着陆情况和商业捕鱼船队提供的轶事判断，在美国东海岸的中大西洋海岸线上，银鳕鱼或白鲸的数量似乎正在减少。有证据表明，这可能是过度捕捞引起的。如果属实，则可能有必要对这一渔业进行额外的政府管制。但是，对于诸如银鳕鱼这样的迁徙物种而言，登陆量下降的另一种解释可能是，由于环境因素的变化，例如底部温度等的变化，种群已从中大西洋海岸线的传统捕鱼区迁出。此外，由于对无鳕银种群的种群结构知之甚少，因此很难分析总体种群是否在减少或仅某些种群。制定有效的管理策略将需要此类信息。我们目前正在通过审查国家海洋渔业局（NMFS）从1960年代至1990年代收集的研究数据来调查白银鳕鱼种群的减少，以寻找环境变化与渔获量下降之间的相关性。与过度捕捞相反，这种相关性可能有利于种群的重新安置，以解释记录的上岸量下降。此外，我们正在收集从缅因州湾向南至中大西洋海湾的血液样本，以准备用于微卫星DNA分析的DNA，以确定无须鳕的种群结构。我们认为，通过微卫星DNA分析确定的种群结构，以及渔获量与环境因素之间的相关性，将为制定银鳕鱼种群的有效渔业管理计划提供有价值的信息。初步的微卫星DNA数据分析表明，可能有不止一个银鳕种群。同样，对中大西洋大西洋底部水温的初步分析似乎表明，在所调查的三十年中，平均温度升高了。

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