期刊
FISHERIES MANAGEMENT AND ECOLOGY
卷 19, 期 5, 页码 400-409出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2400.2012.00854.x
关键词
Gadus morhua; hatchery smolt; predation; release strategy; Salmo salar; telemetry
类别
资金
- Norwegian Research Council [183992/S30]
- Statkraft Energy AS
- Norwegian Directorate for Nature Management
Release strategies of hatchery-reared Atlantic salmon, Salmo salar L., smolts were compared by studying survival and migration of smolts (n = 99) and their predators (Atlantic cod, Gadus morhua L., n = 8; and saithe, Pollachius virens (L.), n = 2) during the first 37 km of the marine migration using acoustic telemetry. Survivorship was higher in smolts released at the river mouth (30%) compared with smolts released in the river (12%). This was likely due to mortality or reduced migratory behaviour in fresh water. The marine mortality was 37% during the first 2 km after leaving the river (at least 25% mortality because of predation from marine fishes), and total marine mortality over 37 km was 68%. Detection-depth data were useful for evaluating whether the tagged smolts were alive or predated; mortality during the first 2 km of outward migration would have been underestimated at 26% instead of 37% without the analysis of depth detection. Transmitters from consumed post-smolts remained in predators for up to 47 days (average 29 days).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据