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1. Photophores isolated from the mesopelagic fish Argyropelecus hemigymnus consume oxygen at a rate of l.22 ± 0.17 nmol min−1 in saline at 20°C. 2. In the presence of 5 × 10−4 moll−1 adrenalin the preparations that responded by a long-lasting luminescence showed a significant decrease of their resting respiration rate. After the adrenalin had been washed out, oxygen consumption increased immediately to the previous resting level and was inhibited by 5 × 10−4moll−1 KCN. 3. It is suggested that the mechanism of light production by isolated photophores of the epipelagic fish Porichthys and the mesopelagic fish Argyropelecus are different.

Effects of Adrenalin on the Oxygen Consumption and Luminescence of the Photophores of the Mesopelagic Fish Argyropelecus Hemigymnus