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Behaviour and metabolic rates of brown trout and Atlantic salmon: Influence of food, environment and social interactions
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For Atlantic salmon (Salmo salar) and brown trout (Salmo trutta), the decision to migrate or when to migrate is believed to be influenced by the individual’s metabolic rate (MR) relative its food intake. As MR was expected to be related to behaviour, the potential links between behaviour and metabolic costs was studied. For both salmon and trout the dominant individual had a higher standard metabolic rate (SMR) than its subordinate counterpart. Also, successful migrants of brown trout had a higher SMR than unsuccessful migrants, whereas no such difference was found for obligate migratory Atlantic salmon. Measures of variation in MR and boldness indicated that Atlantic salmon was more sensitive to stress than brown trout and became passive when stressed. When two trout were interacting, an increase in ventilation rate (VR) was positively correlated to fighting intensity. The first day after an interaction, VR did not differ between small dominant and subordinate trout (mean size 3.7g), whereas for large trout (26.0g) subordinates had higher VR than dominants. However, a combination of low temperature (10°C) and high water velocity (22cm/s) eliminated this difference. This probably reflects the high swimming activity of small dominants and the low motivation for dominants to defend a large territory when temperatures were low and the cost of moving was high. These results show that the relationship between MR and behaviour may differ depending on species, fish size and environmental factors.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2012. , 30 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2012:4
Keyword [en]
Salmo trutta, Salmo salar, behaviour, metabolic rates
National Category
Natural Sciences
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-9176ISBN: 978-91-7063-408-6 (print)OAI: oai:DiVA.org:kau-9176DiVA: diva2:476646
Public defence
2012-02-24, Reimersalen, 9C 204, 10:15 (English)
Opponent
Supervisors
Available from: 2012-02-06 Created: 2012-01-12 Last updated: 2015-11-12Bibliographically approved
List of papers
1. Individual variation in behaviour and metabolic rates of brown trout (Salmo trutta) and Atlantic salmon (Salmo salar)
Open this publication in new window or tab >>Individual variation in behaviour and metabolic rates of brown trout (Salmo trutta) and Atlantic salmon (Salmo salar)
(English)Manuscript (preprint) (Other academic)
Keyword
Salmo trutta, Salmo salar, behaviour, boldness, aggressiveness, dominance, standard metabolic rate
National Category
Natural Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-9174 (URN)
Available from: 2012-01-12 Created: 2012-01-12 Last updated: 2015-11-12Bibliographically approved
2. The cost of being aggressive: a comparison of winners and losers of territorial contests
Open this publication in new window or tab >>The cost of being aggressive: a comparison of winners and losers of territorial contests
(English)Manuscript (preprint) (Other academic)
Keyword
Aggression, metabolic rate, Salmo trutta, activity, food intake
National Category
Natural Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-9175 (URN)
Available from: 2012-01-12 Created: 2012-01-12 Last updated: 2012-02-06Bibliographically approved
3. The effect of temperature and current velocity on ventilation rates of dominant and subordinate trout (Salmo trutta)
Open this publication in new window or tab >>The effect of temperature and current velocity on ventilation rates of dominant and subordinate trout (Salmo trutta)
(English)Manuscript (preprint) (Other academic)
Keyword
Dominance, metabolic rate, Salmo trutta, temperature, water velocity
National Category
Natural Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-9172 (URN)
Available from: 2012-01-12 Created: 2012-01-12 Last updated: 2015-11-12Bibliographically approved
4. The effects of ration size on migration by hatchery-raised Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
Open this publication in new window or tab >>The effects of ration size on migration by hatchery-raised Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
Show others...
2011 (English)In: Ecology of Freshwater Fish, ISSN 0906-6691, E-ISSN 1600-0633, Vol. 20, no 4, 548-557 p.Article in journal (Refereed) Published
Abstract [en]

The possibility to increase the proportion of migrating hatchery-reared smolts by reducing their food ration was studied. Lake-migrating, hatchery-reared salmon (Salmo salar) and trout (Salmo trutta) smolts were either fed normal rations, based on recommendations from the fish-farming industry, or reduced (15–20%) rations. They were released into the River Klarälven, western Sweden, and followed as they swam downstream to Lake Vänern, a distance of around 25 km. For both Atlantic salmon and brown trout, smolts fed a reduced ration migrated faster than fish fed a normal ration. Furthermore, a higher proportion of salmon smolts fed reduced rations migrated to the lake than fish fed normal rations in 2007 but not in 2006. This difference between years corresponded to greater treatment differences in size and smolt status in 2007 than in 2006. For trout, the proportion of migrating individuals and smolt development did not differ with ration size. Trout migrants fed a normal ration had a higher standard metabolic rate (SMR) than nonmigrants, whereas there was no difference in SMR between migrating and nonmigrating salmon. These results show that it is possible to use a reduced food ration to increase the migration speed of both Atlantic salmon and brown trout and to increase the proportion of migrating Atlantic salmon.

Keyword
Atlantic salmon, brown trout, migration, standard metabolic rate
National Category
Ecology
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-5591 (URN)10.1111/j.1600-0633.2011.00503.x (DOI)000296448500007 ()
Available from: 2010-04-25 Created: 2010-04-25 Last updated: 2017-12-12Bibliographically approved

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