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Journal of Experimental Biology 126,469-477 (1986)
Published by Company of Biologists 1986

Oxygen Consumption and Luminescence of Maurolicus Photophores Stimulated by Potassium Cyanide

J. MALLEFET 1 and F. BAGUET 2

1 Laboratoire de Physiologie Généerale et des Animaux Domestiques, Université Catholique de Louvain, 5, Place de la Croix du Sud, B-1348 Louvain-la-Neuve, Belgium; Aspirant FNRS
2 Laboratoire de Physiologie Généerate et des Animaux Domestiques, Université Catholique de Louvain, 5, Place de la Croix du Sud, B-1348 Louvain-la-Neuve, Belgium

1. Isolated photophores of Maurolicus muelleri, maintained in saline at 20 °C, consume oxygen at a mean rate of 1.25 ± 0.07 nmol O2 min-1 (N = 50).

2. In the presence of 5 x 10-6 mol l-1 KCN, seven preparations did not luminesce while two showed only dim luminescence. In all nine preparations, the resting oxygen consumption decreased by about 50%.

3. In the presence of 5 x 10-5 mol l-1 KCN, all of the photophores produced a slow, low luminescence and their oxygen consumption decreased by about 75%.

4. In the presence of 5 x 10-4 mol l-1 KCN, all of the photophores produced a slow, high luminescence and their oxygen consumption decreased rapidly by about 92%.

5. It is suggested that the oxygen needs for light production by the isolated photophores of the mesopelagic fish, Maurolicus, differ from those of the epipelagic fish, Porichthys.

Key words: respiration, luminescence, photophore

Accepted on July 29, 1986






© The Company of Biologists Ltd 1986