AbstractThe migration patterns of wild and released farmed Atlantic salmon,Salmo salarL., were studied by radio‐telemetry during migration from entering a river to after spawning. The wild salmon were caught during return migration in bagnets and the farmed salmon were produced in a near by fish farm. Both groups were tagged and released at sea near the river mouth of the River Alta, North Norway. A pronounced individual variation in migration pattern was observed. No significant differences was found between wild and farmed salmon in the distance from entering the river mouth to the place of the first stop (recorded in the same pool for 5 days or longer) and the days from entering the river mouth to arrival at the first stop. For both wild and farmed salmon, mean migration speed was 2.6 km day1, varying from 0.4 to 11.0 km day‐1. A larger proportion of farmed salmon distributed to the upper part of the river at spawning; mean distances from the river mouth were 30.1 and 19.1 km. respectively. Farmed salmon spent a significantly longer time from entering the river to reaching the area occupied during spawn
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机译:摘要 利用无线电遥测技术研究了野生和放生养殖大西洋鲑(Salmo salarL.)从入河到产卵后的洄游规律。野生鲑鱼是在回程洄游期间用袋网捕获的,养殖的鲑鱼是在附近的养鱼场生产的。这两个群体都被标记并在挪威北部阿尔塔河河口附近的海上释放。观察到迁移模式的明显个体差异。野生鲑鱼和养殖鲑鱼从进入河口到第一站(在同一池中记录5天或更长时间)的距离和从进入河口到到达第一站的天数没有显著差异。野生鲑鱼和养殖鲑鱼的平均洄游速度为2.6 km day1,从0.4到11.0 km day-1不等。更大比例的养殖鲑鱼在产卵时分布在河流的上游;距河口的平均距离分别为30.1公里和19.1公里。养殖鲑鱼从进入河流到到达产卵期间占据的区域的时间要长得多
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