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- Title
Temporal synchrony and variation in abundance of Atlantic salmon (Salmo salar) in two subarctic Barents Sea rivers: influence of oceanic conditions.
- Authors
Niemelä, Eero; Erkinaro, Jaakko; Dempson, J. Brian; Julkunen, Markku; Zubchenko, Alexander; Prusov, Sergei; Svenning, Martin A.; Ingvaldsen, Randi; Holm, Marianne; Hassinen, Esa
- Abstract
Long-term variation in Atlantic salmon (Salmo salar) stocks was analyzed in two Barents Sea rivers, the Teno and Näätämöjoki, that represent the northernmost distribution area of the species. In contrast to most of the North Atlantic area, these rivers are among a group of northern salmon rivers that, despite wide annual variation in catches, demonstrate no consistent trend for declining abundance. Variations in abundance were generally synchronous for the total catch and numbers of 1-sea-winter (1SW) and 2SW salmon during period of 1972–2003. Part of the variation observed in catches could be related to ocean climate conditions as the mean seawater temperature in July during the year of smoltification for the Kola section of the Barents Sea was significantly related to numbers of 1SW, 2SW, and 3SW salmon in the large River Teno. In contrast, NAO (North Atlantic Oscillation) indices were not related to salmon catches. The latest increase (1999–2001) in salmon catches in these rivers reflects both temporarily improved oceanic conditions and past management measures affecting offshore, coastal, and river fisheries.
- Subjects
BARENTS Sea; BIOLOGICAL variation; GENETICS; ATLANTIC salmon; RIVERS
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2004, Vol 61, Issue 12, p2384
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F04-208