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Journal of Experimental Biology 171,301-314 (1992)
Published by Company of Biologists 1992

Swimming Performance and Haematological Variables in Splenectomized Rainbow Trout, Oncorhynchus Mykiss

P. GALLAUGHER ¹, M. AXELSSON ¹, A. P. FARRELL ¹, and A.P. FARRELL ²

¹ Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
² Department of Biological Sciences, Simon Fraser University Burnaby, British Columbia, Canada V5A 1S6

Haematological variables were measured during aerobic swimming (45–55% of U_crit) and at critical swimming velocity (U_crit) in acutely splenectomized and sham-operated rainbow trout. There was no correlation between haematocrit (Hct) and U_crit in either group of fish. The control values for the haematological variables did not differ significantly between the two groups of fish. Some haematological variables changed during aerobic swimming and at U_crit, but there were no significant differences between the two groups for any of the variables. Arterial blood oxygen tension was significantly reduced at U_crit. Arterial blood oxygen content (Ca_OO2) was maintained in sham-operated fish because the Hct increased significantly. However, in the splenectomized animals, Ca_OO2 decreased (compared to control values) during aerobic swimming and at U_crit because the Hct did not change. Plasma concentrations of lactate and catecholamines were elevated only at U_crit. We provide evidence of a graded spleen contraction during aerobic swimming.

Key words: haematocrit, splenectomy, oxygen, trout, aerobic exercise, Oncorhynchus mykiss

Accepted on July 2, 1992

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