Abstract
1. 1. The thermal properties of intestinal alkaline phosphatase were investigated with three species of deep-water fish in the temperature range of 0–70°C. 2. 2. A relationship was found between the thermal stability of the enzyme and the fish origin. 3. 3. Maximum activity of alkaline phosphatase of the fish that originated in tropical water, namely, Aphanopus carbo and Epigonus telescopus was 60°C, whereas the respective maximum enzyme activity of Etmopterus princeps that originated in the burial zone was 30°C. 4. 4. A breakpoint at 10°C in the Arrhenius plot of enzyme activity in the case of A. carbo and a lack of a break point in the case of E. telescopus and E. princeps, are in accordance with the stenothermic nature of the former and the everythermic nature of the two latter fish species.
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