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Tuesday, January 26 • 3:40pm - 4:00pm
The Effect of Temperature on Acoustical Deterrence of Bighead Hypophthalmichthys Nobilis and Silver Carp H. Molitrix

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AUTHORS: Kelsie A. Murchy, University of Minnesota Duluth, Emily A. Cardinal, University of Minnesota Duluth, Blake Sauey, U.S. Geological Survey, Jon J. Amberg, U.S. Geological Survey, Mark P. Gaikowski, U.S. Geological Survey, Allen F. Mensinger, University of Minnesota Duluth

ABSTRACT: Bighead carp Hypophthalmichthys nobilis and silver carp H. molitrix are invasive fish that were accidentally released into the Mississippi River and surrounding tributaries. For approximately the last 30 years, they have expanded their range throughout the Mississippi River drainage and are now at risk of entering the Great Lakes. Both species react negatively to sound and acoustic deterrents could be used as a practical tool within integrated pest management programs to manage these invasive species. However, anecdotal evidence suggests that water temperature may influence their behavioral response to sound, and therefore it is imperative to examine the effectiveness of acoustical deterrents over the range of temperatures that the fish will typically encounter in the Mississippi drainage. Phonotaxis behavior was assessed with broadband sound at four different temperatures (13° C, 18° C, 26° C and 32° C); and results suggest there is a decreased effectiveness of acoustic deterrents at lower temperatures. It remains unknown the extent carp swimming speeds are correlated to water temperature and diminished deterrence at lower temperature may be partially offset by slower swimming speeds. Nevertheless, results from this study have implications on the use of an acoustic barrier for bighead carp and silver carp.

Tuesday January 26, 2016 3:40pm - 4:00pm EST