Abstract

Migration success of hatchery-reared and wild sea trout smolts through the lower stretches and the estuary of a Baltic sea river were studied. During 3 years, wild and hatchery trout smolts were implanted with acoustic transmitters and released 14 km upstream from the river mouth. In order to monitor their out-migration pattern, acoustic receivers were deployed along the migratory route. Data on number of fish detected and date and time of detections were analysed and the migratory performance of wild and hatchery-reared fish was compared. A significantly higher proportion of wild fish (80%) successfully migrated to the coast compared to fish of hatchery origin (27.5%) and migration was faster in wild smolts. Hatchery fish were larger and had a higher condition factor and lipid concentrations, which are proposed as possible reasons for the poorer migratory performance of the hatchery-reared fish. (C) 2009 Elsevier B.V. All rights reserved.

Keywords

Brown trout; Survival; Lipid concentration; Predation; Telemetry

Published in

Fisheries Research
2009, Volume: 99, number: 3, pages: 210-215
Publisher: ELSEVIER SCIENCE BV

SLU Authors

• Eriksson, Lars-Ove

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Fish and Aquacultural Science
Environmental Sciences related to Agriculture and Land-use


Publication identifier

DOI: https://doi.org/10.1016/j.fishres.2009.06.004

Permanent link to this page (URI)

https://res.slu.se/id/publ/49427