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- Title
Run timing and migration routes of returning Atlantic salmon in the Northern Baltic Sea: implications for fisheries management.
- Authors
Siira, A.; Erkinaro, J.; Jounela, P.; Suuronen, P.
- Abstract
Return migration of Atlantic salmon, Salmo salar L., was studied in the Gulf of Bothnia, northern Baltic Sea, by a mark-recapture experiment and catch records from commercial trap-nets. Coastal salmon fishing is regulated by delayed opening of the fishery in consecutive regions based on the assumption that the wild fish migrate before reared ones and the migration is unidirectional and continuous from south to north. Neural network modelling suggested that the migration does not progress linearly from one regulation region to another, but shows variation between origin and sea age among and within regions. Further evidence of the non-linear migration included a noticeable part of salmon on their way to two major estuaries first visiting the northern-most Bothnian Bay before turning back south. Salmon returning to the different homing sites in the north showed no differences in run timing in the southern Gulf whereas the same individual fish showed differences in catch accumulation further north. Run timing estimates indicated only a slight tendency towards earlier migration for wild salmon compared with reared fish.
- Subjects
GULF of Bothnia; BALTIC Sea; FISH migration &; climate; ATLANTIC salmon; SALMON fishing; SALMON bycatches; FISHERY management
- Publication
Fisheries Management & Ecology, 2009, Vol 16, Issue 3, p177
- ISSN
0969-997X
- Publication type
Article
- DOI
10.1111/j.1365-2400.2009.00654.x