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Divergence in behavioural responses to stress in two strains of rainbow trout (Oncorhynchus mykiss) with contrasting stress responsiveness
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology, Comparative Physiology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology, Comparative Physiology.
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2005 (English)In: Hormones and Behavior, ISSN 0018-506X, E-ISSN 1095-6867, Vol. 48, no 5, 537-544 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to establish whether two lines of rainbow trout divergent for their plasma cortisol response to a standardized stressor would show consistent differences in their behavioural response to a range of challenging situations. Our results show that the high- and low-responding (HR and LR) lines of rainbow trout did not differ in the aggression shown towards an intruder or in their response to the introduction of a novel object to their home environment. However, there was a difference in behaviour between the two selection lines when they were exposed to two unfamiliar environments. These results suggest that the behaviour of the HR and LR fish differs when they are challenged in unfamiliar environments, while their behaviour does not differ when they are challenged in their home environment. These observations are in agreement with studies on mammals that show that individuals with reactive coping styles perform similarly to proactive animals when they are challenged in a familiar environment, while they show different behaviour when they are challenged in unfamiliar environments. Thus, these results provide further evidence that the HR and LR selection lines of rainbow trout exemplify the two different coping styles described in mammals.

Place, publisher, year, edition, pages
2005. Vol. 48, no 5, 537-544 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-93738DOI: 10.1016/j.yhbeh.2005.04.008OAI: oai:DiVA.org:uu-93738DiVA: diva2:167312
Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Stress Coping Strategies in Rainbow Trout (Oncorhynchus mykiss)
Open this publication in new window or tab >>Stress Coping Strategies in Rainbow Trout (Oncorhynchus mykiss)
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Animals show a great variety in physiological and behavioural responses to stressors. These responses are often bimodally distributed within populations and show consistency on an individual level over time and across situations, which in terrestrial vertebrates have been identified as proactive and reactive stress coping strategies. Proactive animals show lower cortisol responses, higher sympathetic activation and brain serotonergic activity compared to reactive animals. Behaviourally, proactive animals are more aggressive, more active in avoiding stressors, they form routines and show fewer cases of conditioned immobility compared to reactive animals. Our aim has been to reveal if such stress coping strategies exist in fish. Our results show that rainbow trout with high (HR) or low (LR) cortisol responses to stressors differs in sympathetic activation and brain serotonin turnover in the same manner as proactive and reactive mammals. HR fish showed less locomotor activity when reared in large groups (30 individuals) compared to LR fish. When reared in isolation there were no differences between HR and LR fish when exposed to stressors within a familiar environment. The adaption of a proactive coping style among reactive coping individuals when they are challenged within a familiar environment has previously been shown to be distinction between proactive and reactive coping mammals. However, when they were transferred to unfamiliar environments a behavioural difference between the two lines was observed indicating different stress coping strategies akin to those described in mammals. Finally, we observed a consistency over time in the cortisol response of an unselected line of rainbow trout. Fish from this line also demonstrated a correlation between behavioural responses to different stressors. However, there was no apparent connection between these behavioural responses and the cortisol response. Overall, the results of this thesis have strengthened the hypothesis that different stress coping strategies exist in teleost fish.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 118
Keyword
Biology, Salmonid fish, Stress coping, Serotonin, Cortisol, Catecholamines, Monoaminoxidase, Tryptophan, Monoamines, Behaviour, Stress, Biologi
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-6132 (URN)91-554-6397-5 (ISBN)
Public defence
2005-12-09, Lindahlssalen, EBC, Norbyvägen 18 A, Uppsala, 10:00
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Available from: 2005-11-22 Created: 2005-11-22 Last updated: 2013-07-24Bibliographically approved

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