Östergren, Johan
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
- International Institute for Applied Systems Analysis (IIASA)
Research article2011Peer reviewed
High variability in spawning migration of sea trout, Salmo trutta, in two northern Swedish rivers
Östergren, Johan; Lundqvist, Hans; Nilsson, Jan
Abstract
P>Telemetry was used to examine spawning migration of sea trout, Salmo trutta L. (n = 126), in two rivers in northern Sweden. The spawning areas defined by radio-tagged fish differed between the river systems. In the River Vindelalven, sea trout spawned in the main stem and 80% of tagged individuals returned to areas where hatchery-reared juveniles had been previously stocked. In the River Pitealven, 74% of tagged sea trout ascended tributaries for spawning. Tagged fish were categorised into three groups of migratory pattern. cart (classification and regression tree) analysis indicated that distance from tagging location to spawning site (S(dist)) explained the migratory patterns. Large S(dist) separated fish with stepwise upstream migration from those with up- and downstream migrations and one-directional direct migration. Fish tagged early in the season migrated the longest distance to spawning areas. Stocking locations and sex explained the large search behaviour up- and downstream in the rivers. The findings are important for the sustainable management of sea trout in the Gulf of Bothnia.
Keywords
hatchery; homing; human impact; radio-tagging; salmonid; water temperature
Published in
Fisheries Management and Ecology
2011, volume: 18, number: 1, pages: 72-82
Publisher: WILEY-BLACKWELL PUBLISHING, INC
SLU Authors
Lundqvist, Hans
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
Nilsson, Jan
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
Global goals (SDG)
UKÄ Subject classification
Fish and Aquacultural Science
Publication identifier
- DOI: https://doi.org/10.1111/j.1365-2400.2010.00774.x
Permanent link to this page (URI)
https://res.slu.se/id/publ/57723