Laboratory experiments demonstrate that bubble curtains can effectively inhibit movement of common carp

摘要: Abstract Although bubble curtains have been proposed many times as practical and inexpensive solutions to hinder the movement of invasive fish, few studies examined why or how they might work. By understanding influence fish behavior, management tools could be developed control fish. In this study, common carp (Cyprinus carpio L.) was used examine performance three different (fine-, graded-, coarse-bubble) acoustically enhanced systems in an indoor channel. Trials revealed that graded- coarse-bubble reduced passage across curtain by 75–85% both up- down-stream directions. Concurrent acoustic field measurements these generated sound near 200 Hz at approximately 130 dB (ref 1 μPa), well above hearing threshold. Further testing with speaker arrays lighting indicated avoidance involved responses fluid motion rather than visual cues. tests are warranted, our results suggest may a viable deterrence system limit movement.