気泡幕による魚群の行動制御に関する研究 Ｉ 小型水槽内における気泡幕の魚類駆集効果

Abstract

In order to develop a new method for the control of fish behaviour, the authors observed the response of fishes to an air bubble curtain by laboratory experiments. An annular trough set up in a small scale test tank was intercepted by the air bubble curtain, which was rotated along the trough. The response toward the air bubble curtain of Japanese parrotfish Oplegnathus fasciatus, jack mackerel Trachurus japonicus, and threeline grunt Parapristipoma trilineatum were observed with the variation of moving speed (11.0-31.7cm/s) and air flow (3-12l/min). The results show the typical herding effect of the moving air bubble curtain, as the fish keep swimming in escaping from the bubbles with a possible herding time of one hour in some specific conditions. The herding effect, however, varies with experimental species and condi-tions, and is lowered with the habituation of fish kept in an air bubbled tank.