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Journal of Experimental Biology 141,377-387 (1989)
Published by Company of Biologists 1989

Circulating Catecholamines and Swimming Performance in the Atlantic Cod, Gadus Morhua

P. J. BUTLER ¹, M. AXELSSON ², F. EHRENSTROM ², J. D. METCALFE ³, and S. NILSSON ²

¹ Department of Zoophysiology, University of Göteborg, PO Box 250 59, S-400 31 Goteborg, Sweden; Department of Zoology and Comparative Physiology, University of Birmingham, Birmingham B15 2TT, UK.
² Department of Zoophysiology, University of Göteborg, PO Box 250 59, S-400 31 Göteborg, Sweden
³ Department of Zoophysiology, University of Göteborg, PO Box 250 59, S-400 31 Göteborg, Sweden; Directorate of Fisheries Research, Fisheries Laboratory, Ministry of Agriculture, Fisheries and Food, Lowestoft, Suffolk NR33 OHT, UK.

Sectioning the first four pairs of spinal nerves prevents the large increase in circulating catecholamine concentrations seen in Atlantic cod swimming at their critical velocity (U_crit). There is also a significant reduction in the swimming performance of the fish. To test whether this reduced performance results from the lack of increase in plasma catecholamine levels or from the fact that other organs are also denervated by the operative procedure, a mixture of adrenaline and noradrenaline was infused into swimming, denervated fish. This caused a significant increase in their U_crit. It is concluded, therefore, that the rise in plasma catecholamine levels seen in Atlantic cod swimming at their maximum sustainable velocity enhances the swimming performance of these fish.

Key words: Gadus morhua, teleosts, catecholamines, swimming performance

Accepted on July 4, 1988

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