水深30mの人工魚礁におけるマダカアワビHaliotis madakaの行動

抄録

The behavioral character of the abalone Haliotis madaka was examined around the artificial fish reef settled at 30m depths. Fourteen abalone, 11.0-18.3cm in shell length, were pursued their stuck places and shell length individually for 4 times during 16 months. Ten of 14 abalone were observed within 1m during 16 months. Two abalone, 18.3 and 17.4 cm in shell length, were photographed for a few days by an automatic underwater camera. In the daytime, two abalone firmly stuck at the same position. In the night time, they lift their shell slightly and ocassonally changed their body-axis to catch drifted algae. One abalone left it's stuck place and returned to the same position in one night during three observed nights.