Crowding causes prolonged leucopenia in salmonid fish, despite interrenal acclimation

Pickering, A.D.; Pottinger, T.G.. 1987 Crowding causes prolonged leucopenia in salmonid fish, despite interrenal acclimation. Journal of Fish Biology, 30 (6). 701-712.

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Crowding for 3 weeks significantly reduced the coefficient of condition of both brown trout and rainbow trout. However, acclimation of the hypothalamic-pituitary-interrenal (HPI) axis, as assessed by changes in plasma cortisol levels, occurred within 6 days for brown trout and within 10 days for rainbow trout. Blood lactate levels were significantly reduced in the crowded fish of both species throughout the experiment. Sexual maturation of the male fish significantly elevated the number of circulating red blood cells in both species, reduced the lactate levels in brown trout and elevated cortisol levels in the rainbow trout. Despite the relatively rapid interrenal acclimation, the numbers of thrombocytes and lymphocytes in the blood of both species were significantly reduced during the period of crowding and it is concluded that changes in the composition of circulating blood cells are more reliable indicators of chronic crowding stress than are plasma cortisol levels. These findings are discussed in relation to the role of the HPI axis in suppressing the defence systems of salmonid fish during periods of chronic stress.

Item Type: Publication - Article
Digital Object Identifier (DOI):
CEH Sections/Science Areas: _ Pre-2000 sections
ISSN: 0022-1112
Additional Keywords: brown trout, rainbow trout, Oncorhynchus mykiss, Salmo trutta, white blood cells, lymphocyte, thrombocyte, erythrocyte, lactate, cortisol, stress
NORA Subject Terms: Zoology
Biology and Microbiology
Date made live: 10 Sep 2015 10:18 +0 (UTC)

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