魚類の水温記憶

概要

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Ability to memorize surrounding water temperature in fish was examined by using a change in heart rate recorded in an experimental tank designed to change water temperature. Tilapia,Sarotherodon mossambicus (PETERS), reared for more than 50 days at a constant water temperature was used in the experiment. When the water temperature was lowered from rearing one, whilebody temperature slowly changed and became almost same with water temperature at about 30 minutes later, heart rate suddenly decreased and remained low and irregular. After coolingfor 30 minutes to 10 hours, the heart rate increased and recovered the initial level only when thewater temperature was changed to rearing one. This phenomenon was considered to show that the fish have memorized the rearing water temperature and so the heart rate recovered initial level at the rearing temperature, and the fish memorize surrounding water temperature at least for 10 hours.
鹿児島大学の論文