Postrelease exploration and diel activity of hatchery, wild, and hybrid strain brown trout in seminatural streams

Show full item record



Permalink

http://hdl.handle.net/10138/325608

Citation

Alioravainen , N , Prokkola , J M , Lemopoulos , A , Härkönen , L , Hyvärinen , P & Vainikka , A 2020 , ' Postrelease exploration and diel activity of hatchery, wild, and hybrid strain brown trout in seminatural streams ' , Canadian Journal of Fisheries and Aquatic Sciences , vol. 77 , no. 11 , pp. 1772-1779 . https://doi.org/10.1139/cjfas-2019-0436

Title: Postrelease exploration and diel activity of hatchery, wild, and hybrid strain brown trout in seminatural streams
Author: Alioravainen, Nico; Prokkola, Jenni M.; Lemopoulos, Alexandre; Härkönen, Laura; Hyvärinen, Pekka; Vainikka, Anssi
Contributor: University of Helsinki, Organismal and Evolutionary Biology Research Programme
Date: 2020-11
Language: eng
Number of pages: 8
Belongs to series: Canadian Journal of Fisheries and Aquatic Sciences
ISSN: 0706-652X
URI: http://hdl.handle.net/10138/325608
Abstract: Behaviour that is adaptive in captivity may be maladaptive in the wild and compromise postrelease survival of hatchery fish. The understanding of behavioural variation displayed immediately after release could help to improve hatchery protocols and development of behavioural tests for assessing the fitness of fish reared for releases. We characterized the postrelease behaviour of common-garden-raised offspring of wild resident, captive-bred migratory, and hybrid brown trout (Salmo trutta) in two experiments: in small artificial channels and in high and low densities in seminatural streams. The results from seminatural streams showed that hatchery fish were more likely to disperse downstream from the initial stocking site compared with hybrid and wild strain fish. The small-scale experiment did not reveal this ecologically pivotal difference in postrelease performance among strains, and individual responses were inconsistent between the experiments. Circadian activity patterns did not differ among strains. These detailed observations of postrelease behaviour reveal important intrinsic differences in dispersal traits among brown trout strains and suggest that selective breeding and crossbreeding can substantially affect these traits.
Subject: SALMON SALMO-SALAR
PACE-OF-LIFE
TRUTTA L
STOCKING EXPERIMENTS
PERSONALITY-TRAITS
TERRITORY SIZE
LONG-TERM
TRADE-OFF
GROWTH
BEHAVIOR
1172 Environmental sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
Alioravainen_Po ... in_seminatural_streams.pdf 606.5Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record