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首页> 外文期刊>ICES Journal of Marine Science >Size of wild and hatchery-reared Atlantic salmon populations in the northern Baltic Sea estimated by a stratified mark-recapture method
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Size of wild and hatchery-reared Atlantic salmon populations in the northern Baltic Sea estimated by a stratified mark-recapture method

机译：通过分层标记捕获方法估算波罗的海北部野生和孵化场饲养的大西洋鲑的种群数量

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摘要

We estimated the total size of the Atlantic salmon (Salmo salar) population complex (wild and cultured) in the Gulf of Bothnia, northern Baltic Sea, using a stratified mark-recapture method. In 2001 and 2002, 1970 salmon were captured by the commercial trapnet fishery and tagged with external arrow tags. A total of 349 tagged fish was later recaptured among 65 180 salmon screened for tags. Recoveries were gathered by the commercial trapnets and by screening fish entering counting facilities in rivers and broodstock fisheries at the river mouths. In addition, tags were recovered from recreational river catches. Our estimates suggest that the total size of the migrating population in both years was about 230 000 fish. Proportions of wild and cultured salmon differed between the two years. In 2001, the proportion of wild salmon was 37%; the corresponding figure for 2002 was 62%. Based on estimates of wild salmon smolt production and the number of released smolts, the estimated proportion of cultured smolts that survived the feeding migration and returned to the Gulf of Bothnia (2-4%) was approximately 2.5-4.5 times lower than that of wild smolts (9-10%).
机译：我们使用分层标记捕获方法估算了波罗的海北部波特尼亚湾的大西洋鲑（Salmo salar）种群复杂（野生和养殖）的总大小。在2001年和2002年，1970年，鲑鱼被商业陷网捕捞所捕获，并用外部箭头标签进行了标记。总共349条带标签的鱼随后被重新捕获，共筛选了65180条带标签的鲑鱼。通过商业陷阱网和筛查进入河流计数设施的鱼类以及河口的亲鱼捕捞来收集回收物。此外，从休闲河道捕获物中回收了标签。我们的估计表明，这两个年度的移民人口总数约为23万条。两年间，野生和养殖鲑鱼的比例有所不同。 2001年，野生鲑鱼的比例为37％； 2002年的相应数字为62％。根据对野生鲑鱼的产量和释放的鲑鱼数量的估计，存活下来并返回博特尼亚湾的养殖鲑鱼的估计比例（2-4％）比野生鲑鱼低约2.5-4.5倍mol（9-10％）。

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