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Wood addition in the hatchery and river environments affects post-release performance of overwintering brown trout

Watz, Johan; Calles, Olle; Carlsson, Niclas; Collin, Teemu; Huusko, Ari; Johnsson, Jörgen; Nilsson, Per Anders LU ; Norrgård, Johnny and Nyqvist, Daniel (2019) In Freshwater Biology 64(1). p.71-80
Abstract

Habitat structural complexity affects the behaviour and physiology of individuals, and responses to the environment can be immediate or influence performance later in life through delayed effects. Here, we investigated how structural enrichment, both pre-release in the hatchery rearing environment and post-release in the wild, influenced winter growth and site fidelity of brown trout stocked into side channels of a regulated river. Experiencing structural enrichment in the rearing environment during 3 months in autumn had no pre-release effect on growth, but a delayed positive effect after release during the subsequent winter. Moreover, trout recaptured in wood-treated sections of the side channels had grown more than trout recaptured... (More)

Habitat structural complexity affects the behaviour and physiology of individuals, and responses to the environment can be immediate or influence performance later in life through delayed effects. Here, we investigated how structural enrichment, both pre-release in the hatchery rearing environment and post-release in the wild, influenced winter growth and site fidelity of brown trout stocked into side channels of a regulated river. Experiencing structural enrichment in the rearing environment during 3 months in autumn had no pre-release effect on growth, but a delayed positive effect after release during the subsequent winter. Moreover, trout recaptured in wood-treated sections of the side channels had grown more than trout recaptured in control sections. Wood enrichment in the side channels also increased overwinter site fidelity. These results show that adding structure during a relatively short period may alter growth trajectories, and adding wood to side channels is a cost-effective method to enhance winter habitat carrying capacity for juvenile salmonids in regulated rivers.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
growth, habitat complexity, restoration, site fidelity, stream wood
in
Freshwater Biology
volume
64
issue
1
pages
71 - 80
publisher
Wiley-Blackwell
external identifiers
  • scopus:85055719009
ISSN
0046-5070
DOI
10.1111/fwb.13195
language
English
LU publication?
yes
id
d8ec96f8-6bc2-4442-a994-be51137f2121
date added to LUP
2018-12-07 12:16:07
date last changed
2019-01-14 13:01:15
@article{d8ec96f8-6bc2-4442-a994-be51137f2121,
  abstract     = {<p>Habitat structural complexity affects the behaviour and physiology of individuals, and responses to the environment can be immediate or influence performance later in life through delayed effects. Here, we investigated how structural enrichment, both pre-release in the hatchery rearing environment and post-release in the wild, influenced winter growth and site fidelity of brown trout stocked into side channels of a regulated river. Experiencing structural enrichment in the rearing environment during 3 months in autumn had no pre-release effect on growth, but a delayed positive effect after release during the subsequent winter. Moreover, trout recaptured in wood-treated sections of the side channels had grown more than trout recaptured in control sections. Wood enrichment in the side channels also increased overwinter site fidelity. These results show that adding structure during a relatively short period may alter growth trajectories, and adding wood to side channels is a cost-effective method to enhance winter habitat carrying capacity for juvenile salmonids in regulated rivers.</p>},
  author       = {Watz, Johan and Calles, Olle and Carlsson, Niclas and Collin, Teemu and Huusko, Ari and Johnsson, Jörgen and Nilsson, Per Anders and Norrgård, Johnny and Nyqvist, Daniel},
  issn         = {0046-5070},
  keyword      = {growth,habitat complexity,restoration,site fidelity,stream wood},
  language     = {eng},
  number       = {1},
  pages        = {71--80},
  publisher    = {Wiley-Blackwell},
  series       = {Freshwater Biology},
  title        = {Wood addition in the hatchery and river environments affects post-release performance of overwintering brown trout},
  url          = {http://dx.doi.org/10.1111/fwb.13195},
  volume       = {64},
  year         = {2019},
}