Changes in numbers of leukocytes in immune organs of juvenile coho salmon after acute stress or cortisol treatment

Journal of Aquatic Animal Health
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Abstract

We examined the effects of acute stress and cortisol treatment on the number of leukocytes (normalized for fish body weight) in the blood, thymus, spleen, and anterior kidney of juvenile coho salmon Oncorhynchus kisutch. In acutely stressed or cortisol-fed fish, the numbers of leukocytes increased significantly in the thymus and anterior kidney, and decreased significantly in blood and spleen within 1 d after treatment. Numbers of cells in the anterior kidney, blood, and spleen returned to control levels by 3 d after treatment, but cell numbers in the thymus remained significantly greater than control values until 3–7 d after acute stress. Although dietary cortisol resulted in increased plasma cortisol titers and caused the same changes in leukocyte distribution as those caused by acute stress, the magnitude or duration of elevated cortisol levels and leukocyte numbers were not correlated. These results suggest that, although increased plasma cortisol titers induced by stress may be involved in the change in number of cells in various immune organs, factors other than cortisol are involved as well.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Changes in numbers of leukocytes in immune organs of juvenile coho salmon after acute stress or cortisol treatment
Series title Journal of Aquatic Animal Health
DOI 10.1577/1548-8667(1990)002<0298:CINOLI>2.3.CO;2
Volume 2
Issue 4
Year Published 1990
Language English
Publisher Taylor & Francis
Contributing office(s) Western Fisheries Research Center
Description 7 p.
First page 298
Last page 304