Lymphocytopenia and interrenal activity during sexual maturation in the brown trout, Salmo trutta L.

Pickering, A.D.; Pottinger, T.G.. 1987 Lymphocytopenia and interrenal activity during sexual maturation in the brown trout, Salmo trutta L. Journal of Fish Biology, 30 (1). 41-50. 10.1111/j.1095-8649.1987.tb05730.x

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Abstract/Summary

In three different strains of brown trout a marked reduction in the number of circulating lymphocytes occurred in the blood of sexually mature male and female fish during the spawning season. This lymphocytopenia was closely correlated with elevated plasma cortisol levels in all three strains. It is well established that sexual maturation in salmonid fish is associated with an increase in susceptibility to disease: the present study provides strong evidence that this is mediated, at least in part, by a cortisol-induced suppression of lymphoid activity. These findings are discussed in relation to possible physiological roles of cortisol during the spawning period and to the evolution of semelparity in salmonid fish.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1111/j.1095-8649.1987.tb05730.x
UKCEH and CEH Sections/Science Areas:	_ Pre-2000 sections
ISSN:	0022-1112
Additional Keywords:	brown trout, Salmo trutta, strain differences, lymphocytopenia, cortisol, seasonal variation, water temperature,
NORA Subject Terms:	Zoology Biology and Microbiology
Date made live:	10 Sep 2015 10:24 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/511182

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