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Why are smolts migrating?
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
2009 (English)Conference paper, Published paper (Refereed)
Abstract

Due to the loss of spawning areas in regulated rivers, reared smolts are released every spring. In Klarälven it has been seen that the recapture rate of these salmonids has decreased during the last decade. One possible explanation could be that the reared smolts are much larger and have a higher condition factor compared to their wild counterparts. The effect of ration size on the smolts ability to migrate was investigated by giving groups of salmonids a reduced food ration (15%). Their ability to migrate was compared with a control group given as much food as recommended by the fish-farming industry. The salmon (Salmo salar) fed reduced rations in 2007 migrated at a higher rate compared to the control group. This was not seen for salmon in 2006 and trout (Salmo trutta) in 2007. For both species the individuals in the treatment groups migrated faster; the difference was significant for salmon in 2006 and trout in 2007. It was also found that migrating trout had a higher standard metabolic rate than resident individuals. This was not seen for salmon. To further investigate the influence of individual behaviour on the decision to migrate a laboratory study was performed. The aggressiveness, boldness and dominant behaviour of individual salmonids was examined. Dominant fish had a higher standard metabolic rate than subdominants

Place, publisher, year, edition, pages
2009.
Keywords [en]
Brown trout, Atlantic salmon, migration, Standard Metabolic Rate, behaviour
National Category
Biological Sciences
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-11249OAI: oai:DiVA.org:kau-11249DiVA, id: diva2:494821
Conference
NoWPaS, Southampton, UK
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2013-06-12Bibliographically approved

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