To gain more knowledge about escaped farmed salmon Salmo salar in the wild, we investigated the proportion of escapees, body length at escape, proportion escaped as smolts/ post-smolts (≤300 mm) and number of winters in the wild (winter zones in the growth pattern in the scale samples) in catches on the Norwegian coast and in an adjacent fjord from 2013 to 2017. The mean proportion of escapees was higher on the coast (26%) than in the fjord (4%), and es capees caught on the coast had a slightly larger mean body length at escape (607 mm) than in the fjord (557 mm). However, the mean proportion escaped as smolts/post-smolts did not differ significantly be tween the coast (8%) and the fjord (11%). There was also no significant difference in the mean proportion of farmed salmon with 1 or more winter zones after escape (50% on the coast and 56% in the fjord). The proportions of escapees with 1, 2, 3 or 4 winter zones after escape were 28, 20, 2 and 0.4% in catches on the coast and 30, 21 and 4% in catches in the fjord, respectively. This study found that the proportion of escapees was considerably higher in coastal waters than in the fjord. Escapees consisted of farmed salmon from several escape events over several years, and ap proximately 50% of the escapees had one or more winter zones after escape. Thus, escaped farmed salmon may pose a threat to wild salmon populations for several years after the escape event.

中文翻译：

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挪威海岸和邻近鲑鱼峡湾养殖大西洋鲑鱼的逃逸历史和比例

为了获得更多关于野外逃逸养殖鲑鱼的知识，我们调查了逃逸者的比例、逃逸时的体长、作为小鲑鱼/小鲑鱼后逃逸的比例（≤300 毫米）和野外越冬次数（在规模样本中的增长模式）在 2013 年至 2017 年挪威海岸和邻近峡湾的渔获量中。海岸（26%）的平均逃逸比例高于峡湾（4%），而es capees在海岸捕获的逃生时平均体长 (607 毫米) 比在峡湾 (557 毫米) 稍大。然而，由于幼鱼/幼鱼后逃逸的平均比例在海岸（8%）和峡湾（11%）之间没有显着差异。逃逸后具有 1 个或多个冬季区域的养殖鲑鱼的平均比例也没有显着差异（海岸为 50%，峡湾为 56%）。逃逸后有 1、2、3 或 4 个冬季区的逃逸者比例分别为 28、20、2 和 0.4% 的海岸渔获量和 30、21 和 4% 的峡湾渔获量。这项研究发现，沿海水域的逃逸者比例远高于峡湾。逃逸者包括来自几年来几次逃逸事件的养殖鲑鱼，大约 50% 的逃逸者在逃逸后有一个或多个冬季区域。因此，逃逸的养殖鲑鱼可能在逃逸事件发生后的几年内对野生鲑鱼种群构成威胁。沿海渔获量分别为 4% 和峡湾渔获量分别为 30、21 和 4%。这项研究发现，沿海水域的逃逸者比例远高于峡湾。逃逸者包括来自几年来几次逃逸事件的养殖鲑鱼，大约 50% 的逃逸者在逃逸后有一个或多个冬季区域。因此，逃逸的养殖鲑鱼可能在逃逸事件发生后的几年内对野生鲑鱼种群构成威胁。沿海渔获量分别为 4% 和峡湾渔获量分别为 30、21 和 4%。这项研究发现，沿海水域的逃逸者比例远高于峡湾。逃逸者包括来自几年来几次逃逸事件的养殖鲑鱼，大约 50% 的逃逸者在逃逸后有一个或多个冬季区域。因此，逃逸的养殖鲑鱼可能在逃逸事件发生后的几年内对野生鲑鱼种群构成威胁。