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Fin clipping has been used for decades as a marking method for sea-ranched salmonids but there are concerns about the method such as reduced survival and other animal welfare aspects. In this study sea migrating hatchery-reared brown trout juveniles (20–21months old) were marked in four groups by removing either the adipose fin, left pelvic fin, both pelvic fins or the adipose fin+the left pelvic...
Cormorant (Phalacrocorax carbo sinensis) population increases and the resulting predation, can lead to severe effects on fish stocks. In the Dalälven River in Sweden, it was observed that the number of trout and salmon returning to spawn decreased, while the number of cormorants along the coast had increased simultaneously. This study estimated the predatory impact that cormorants had on stocked trout...
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