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Tuesday, January 26 • 2:40pm - 3:00pm
Developing an Acoustic Deterrent to Repel Asian and Common Carps

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AUTHORS: Clark E. Dennis III*, University of Minnesota; Daniel P. Zielinski, University of Minnesota; Peter W. Sorensen, University of Minnesota

ABSTRACT: There is an urgent need to develop species-specific deterrent systems for bigheaded carps Hypophthalmichthys spp. which are moving up the Mississippi and Illinois Rivers. Behavioral deterrents (i.e., sensory stimuli such as sound or light that might alter fish movement) have special promise to limit the upstream movement of bigheaded carp because they do not have many of the disadvantages of physical barriers such as their effects on navigation, high cost and possible effects on all fishes. Acoustic deterrents are a promising technology for carps, including bigheaded and common carp (Cyprinus carpio) because these species have an exceptional sense of hearing whose sensitivity (especially to high frequencies) is much greater than that of most fish native to the Mississippi River Basin. We explored the theory and application of acoustic deterrents for specifically controlling bigheaded carp through laboratory and field experiments that tested the behavioral responses of silver carp (H. molitrix), bighead carp (H. nobilis), common carp, brown trout (Salmo trutta), and lake sturgeon (Acipenser fulvescens). The acoustic signals used were an unaltered and a frequency-filtered (>1000 Hz) complex sound derived from an outboard boat motor sound. In the laboratory, avoidance responses of all carp species were observed to the unaltered complex sound but not the filtered sound. Lake sturgeon and brown trout did not avoid either signal. Preliminary results from a large-scale one-of-a-kind field experiment, carried out in the auxiliary lock chamber at Lock and Dam #1 (St. Paul, MN), were consistent with laboratory observations for common carp and lake sturgeon. In this talk, I will discuss past and ongoing studies on acoustic deterrents along with the potential role of these deterrents in the Mississippi River. (Funded by the Minnesota Environmental and Natural Resources Trust Fund).

Tuesday January 26, 2016 2:40pm - 3:00pm EST