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Drift diving: A quick and accurate method for assessment of anadromous salmonid spawning populations
Fisheries Management and Ecology ( IF 2 ) Pub Date : 2021-05-04 , DOI: 10.1111/fme.12491
Helge Skoglund 1 , Knut Wiik Vollset 1 , Robert Lennox 1 , Øystein Skaala 2 , Bjørn Torgeir Barlaup 1
Affiliation  

The accuracy of drift diving surveys of Atlantic salmon, Salmo salar L. and sea trout, Salmo trutta L., was evaluated by comparing the abundance and size distribution with catches in a fish trap over 6 years in the River Etneelva, western Norway. The population count from drift diving accounted for on average 96.3% of the salmon in the trap after accounting for the catches during fishing. Size structure registered during drift diving corresponded with trap catches of salmon, but the number of small salmon (<3 kg) appeared to be somewhat underestimated, while large salmon (>7 kg) were overestimated in drift diving. For sea trout, the match between drift diving counts and trap registrations was poorer (average 76.3%), but may have been affected by the surveys being performed too late with regards to sea trout spawning time. The study illustrates the utility of drift counting for estimating the entire population of anadromous salmonids in a river.

中文翻译:

漂流潜水:一种快速准确评估溯河鲑鱼产卵种群的方法

大西洋鲑、Salmo salar L. 和海鳟、Salmo trutta漂流潜水调查的准确性L.,是通过将丰度和大小分布与挪威西部 Etneelva 河 6 年多的鱼陷阱中的渔获量进行比较来评估的。计入捕捞渔获量后,漂流潜水的种群数平均占陷阱内鲑鱼的96.3%。漂流潜水期间记录的尺寸结构与鲑鱼的陷阱捕获量相对应,但小鲑鱼(<3 kg)的数量似乎有些被低估,而漂流潜水中大鲑鱼(> 7 kg)的数量被高估。对于海鳟,漂流潜水计数和陷阱登记之间的匹配度较差(平均 76.3%),但可能受到有关海鳟产卵时间的调查进行得太晚的影响。
更新日期:2021-05-04
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