Cormorant impact on trout (Salmo trutta) and salmon (Salmo salar) migrating from the river Dalalven emerging in the Baltic Sea

Sammanfattning

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.

Nyckelord

Carlin; Coded wire tag; Pellet; Salmon; Trout

Publicerad i

Fisheries Research
2009, volym: 98, nummer: 1-3, sidor: 16-21

SLU författare

• Ovegård, Maria

  • Fiskeriverket

• Lunneryd, Sven-Gunnar

  • Fiskeriverket

• Karlsson, Lars

  • Fiskeriverket

UKÄ forskningsämne

Etologi
Ekologi

Publikationens identifierare

• DOI: https://doi.org/10.1016/j.fishres.2009.03.011

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/43919