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Stress responses of juvenile brown trout under winter conditions in a laboratory stream
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. (Naturresurs rinnande vatten)ORCID iD: 0000-0002-4417-6636
2017 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117Article in journal (Refereed) Published
Abstract [en]

Winter can be a challenging period for fish in northern temperate rivers and streams, particularly in those that are channelized, structurally simple or regulated by, for instance, hydropower. In these systems, dynamic sub-surface ice formation commonly occurs and stable periods with ice cover may be short. Under these adverse conditions, access to shelters has been shown to be an important factor that influences overwinter survival, and exclusion from shelters by anchor ice may cause stress. Here, stress responses of juvenile brown trout under simulated winter conditions in an artificial stream were studied. Trout were subjected to three treatments in which the trout (1) were excluded from an instream wood shelter, simulating the effects of anchor ice, (2) had access to the shelter or (3) had surface ice cover in addition to the shelter. There was a positive correlation between ventilation frequency and plasma cortisol concentration. Trout without access to shelter had 30% higher ventilation frequency than trout with instream shelter and surface ice, but no differences in cortisol concentration or stress colour were found between the treatments. River regulation that reduces surface ice and increases anchor ice formation may lead to increased stress and consequently reduce overwinter survival rates.

Place, publisher, year, edition, pages
Springer, 2017.
Keyword [en]
Anchor ice, Colour, Cortisol, Ice cover, Salmonid, Ventilation
National Category
Zoology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-54683DOI: 10.1007/s10750-017-3246-8OAI: oai:DiVA.org:kau-54683DiVA: diva2:1103732
Note

This work was funded by The Royal Swedish Academy of Agriculture and Forestry and Carl-Fredrik von Horn’s Foundation (GFS2015-0085).

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-07-03Bibliographically approved

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Publisher's full texthttps://link.springer.com/article/10.1007/s10750-017-3246-8

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CiteExportLink to record
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Citation style
  • apa
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