University of Oulu

Alioravainen N., Hyvärinen P., Kortet R., Härkönen L. & Vainikka A. 2018: Survival of crossbred brown trout under experimental pike predation and stocking in the wild. Boreal Env. Res. 23: 267–281.

Survival of crossbred brown trout under experimental pike predation and stocking in the wild

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Author: Alioravainen, Nico1; Hyvärinen, Pekka2; Kortet, Raine1;
Organizations: 1University of Eastern Finland, Department of Environmental and Biological Sciences, P.O. Box 111, FI-80101 Joensuu, Finland
2Natural Resources Institute Finland (Luke), Management and Production of Renewable Resources, Manamansalontie 90, FI-88300 Paltamo, Finland
3Department of Ecology and Genetics, P.O. Box 3000, FI-90014 University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Boreal Environment Research Publishing Board, 2018
Publish Date: 2019-06-28


Unintended domestication in hatchery broodstocks reflects a low success of supportive stocking programs. We crossbred adfluvial hatchery-stock brown trout (Salmo trutta) females with males from two non-native adfluvial hatchery strains and a wild but local resident strain to study survival, growth and behaviour of hybrid offspring alternatives. Experimental predation selected for larger size in wild crosses but not in the original hatchery fish. Non-native hatchery crossing reduced the survival in the predation experiment either directly or due to negatively size-selective predation. Wild crosses evaded the areas where predators were present more often than the pure hatchery origin fish in the predation experiment. Our results support an intrinsic anti-predatory behaviour in wild fish and suggest that crosses with resident fish can produce equally growing offspring that are efficient in predation avoidance. Resident, local, wild populations may be a beneficial source for improving the natural-type fitness in broodstocks affected by domestication without natural reproduction.

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Series: Boreal environment research
ISSN: 1239-6095
ISSN-E: 1797-2469
ISSN-L: 1239-6095
Volume: 23
Pages: 267 - 281
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
Funding: This study was funded by a project grant from Emil Aaltonen foundation and Academy of Finland (decision #286261) to A.V. and from European Maritime and Fisheries Fund to P.H.
Copyright information: © 2018 Boreal Environment Research.