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Differences in the sensitivity of brown trout, Salmo trutta L., and rainbow trout, Salmo gairdneri Richardson, to physiological doses of cortisol

Pickering, A.D.; Pottinger, T.G.; Carragher, J.F.. 1989 Differences in the sensitivity of brown trout, Salmo trutta L., and rainbow trout, Salmo gairdneri Richardson, to physiological doses of cortisol. Journal of Fish Biology, 34 (5). 757-768. 10.1111/j.1095-8649.1989.tb03355.x

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Abstract/Summary

Interspecific differences in the stress response of fish may be due, in part, to differences in the sensitivity of target tissues to cortisol. The relative response of brown and rainbow trout to a standardized dose of cortisol was assessed by monitoring condition (K factor), the number of circulating lymphocytes and mortality due to disease, following cortisol treatment. Cortisol implantation resulted in a significant decline in K factor and number of circulating lymphocytes in immature brown trout, but not in immature rainbow trout, despite plasma cortisol levels being similar in both cases. Cortisol implantation in mature brown and rainbow trout significantly increased the mortality rate due to bacterial and fungal infection compared with control fish. Furthermore, the mortality rate due to disease was significantly greater in brown trout than rainbow trout, despite both groups receiving similar doses of steroid.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1095-8649.1989.tb03355.x
CEH Sections: _ Pre-2000 sections
ISSN: 0022-1112
Additional Keywords: condition factor, immunosuppression, cortisol, salmonid, brown trout, rainbow trout, lymphocyte, disease, fungal infection
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 24 Aug 2015 14:14 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511173

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