大型円形水槽内における気泡幕の魚類駆集効果

概要

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The herding effect of an air bubble curtain was examined for jack mackerel Trachurus japonicus in a 2m wide annular trough set in an outdoor tank of 7m diameter. Sixteen air pipes were radially arranged on the bottom at the same interval. The bubbling position can be alternated in order by the valve switches which are connected to the air blower. Group of 10 fish swam away from the bubbling position, and were successfully herded by the position movement of the air bubble curtain to keep going around in the trough. The fish response was observed with varying bubbling intervals of 1, 2, 3, 5, and 10 seconds in daytime and nighttime. Bubbling intervals were equivalent to 7.9-79cm/s or 0.5-5.4 BL/s of the fith swimming speed. In the case of intercepting the trough by a sheet of netting or air bubble curtain, fish was herded toward the stationary barrier, and concentrated just in front of it. This experimental result can be applied to the practical fish capturing methods, such as the set-net, by herding fish into the final trap without net hauling procedures.
日本水産學會の論文