Conditioning invasive bigheaded carps (Hypophthalmichthys molitrix and H. nobilis)to enhance the efficacy of acoustic and CO2 deterrents
Jack A. Culotta, Marie L. Ervin, Brooke J. Vetter, Allen F. Mensinger
TL;DR
Researchers conditioned invasive bigheaded carps to associate sound with CO2 to improve the effectiveness of nonphysical deterrents.
Contribution
The study introduces a conditioning method combining sound and CO2 to enhance long-term deterrent effectiveness for invasive carps.
Findings
Carp conditioned with CO2 took longer to return to the sound chamber compared to controls.
Sound alone remained an effective deterrent regardless of conditioning treatment.
Conditioning with CO2 may promote proactive flight responses over reactive freeze responses in carp.
Abstract
Invasive bigheaded carps (Hypophthalmichthys molitrix and H. nobilis) have caused substantial ecological and economic damage throughout the Mississippi River Basin and expanded their range threatening the Laurentian Great Lakes. Broadband acoustic deterrents have shown promise in repelling carp and are currently being assessed in navigational lock chambers on the Mississippi River. These nonphysical deterrents permit vessel navigation while reducing carp passage. However, no single deterrent is 100% effective and fish may habituate to the sound after repeated playback. Carp exhibit aversive behaviors to carbon dioxide, which suggests combining these two stimuli into one deterrent system could extend the effective duration of sound and reduce the frequency of carbon dioxide (CO2) application. We conditioned bigheaded carps to associate broadband sound from outboard boat motors (0.06–5…
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Taxonomy
TopicsFish Ecology and Management Studies · Marine animal studies overview · Underwater Vehicles and Communication Systems