Migration failure in stocked eels Anguilla anguilla
Migration failure in stocked eels Anguilla anguilla
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放养鳗鱼的洄游失败 安圭拉
DOI：
10.3354/meps254307
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发表时间：
2003
影响因子：
2.5
通讯作者：
L. Westin
中科院分区：
文献类型：
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作者：
L. Westin
银鳗Anguilla anguilla L.，在哥得兰岛的一个淡水湖里放养的幼鳗，在通往波罗的海的一条出口溪流中被捕获。标记后，他们被释放到湖或流以上的细网眼陷阱，并在3至120个月后被重新捕获。在标记和重新捕获之间的时期，大多数体重减轻，长度和脂肪含量减少。据推测，放养的鳗鱼没有机会留下迁移所需的方向线索，即它们无法识别出口流作为迁移的起点，并且缺乏定位波罗的海出口所需的定向机制。湖泊本身包括一个初始圈闭，波罗的海是一个次级圈闭。它的结论是，库存鳗鱼缺乏印记，因此，他们的贡献招聘是零。
Silver eels Anguilla anguilla L., stocked as elvers in a freshwater lake on the island of Gotland, were caught in an outlet stream leading to the Baltic Sea. After tagging, they were released either into the lake or into the stream above a fine-meshed trap, and were recaptured after a period of 3 to 120 mo. During the period between tagging and recapture, the majority lost weight and decreased in length and fat content. It is hypothesized that the stocked eels had had no opportunity to imprint the directional cues necessary for migration; i.e. they were unable to recognize the outlet stream as the starting point of migration and lacked the orientation mechanism necessary to locate the outlet to the Baltic Sea. The lake itself comprises an initial trap, and the Baltic Sea a secondary trap. It is concluded that stocked eels lack imprinting, and that consequently their contribution to recruitment is null.