High variability in spawning migration of sea trout, Salmo trutta, in two northern Swedish rivers

Oestergren J, Lundqvist H, & Nilsson J (2011). High variability in spawning migration of sea trout, Salmo trutta, in two northern Swedish rivers. Fisheries Management and Ecology 18 (1): 72-82. DOI:10.1111/j.1365-2400.2010.00774.x.

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Abstract

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 Vindelaelven, 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 Piteaelven, 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 (Sdist) explained the migratory patterns. Large Sdist 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.

Item Type: Article
Uncontrolled Keywords: Hatchery; Homing; Human impact; Radio-tagging; Salmonid; Water temperature
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: Fisheries Management and Ecology; 18(1):72-82 (February 2011) (Published online 12 December 2010)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:45
Last Modified: 16 Aug 2016 13:00
URI: http://pure.iiasa.ac.at/9637

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