Ovegård, Maria
- Swedish Board of Fisheries
Abstract
Cormorant (Phalacrocorax carbo sinensis) population increases and the resulting predation, can lead to severe effects on fish stocks. In the Dalalven 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 (Salmo trutta) and salmon (Salmo salar) populations in 2005 and 2006 by using Coded Wire Tags and Carlin tags recovered in cormorant pellets. Predatory impact on salmon was found to be low, as no tags were recovered. Impact on trout was estimated 1.9%. Additional inspections of material within and around nests for tags gave similar estimates within a low range 0.8-2.3%. (C) 2009 Elsevier B.V. All rights reserved.
Keywords
Carlin; Coded wire tag; Pellet; Salmon; Trout
Published in
Fisheries Research
2009, volume: 98, number: 1-3, pages: 16-21
SLU Authors
Lunneryd, Sven-Gunnar
- Swedish Board of Fisheries
Karlsson, Lars
- Swedish Board of Fisheries
UKÄ Subject classification
Behavioral Sciences Biology
Ecology
Publication identifier
- DOI: https://doi.org/10.1016/j.fishres.2009.03.011
Permanent link to this page (URI)
https://res.slu.se/id/publ/43919