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AUTHORS: Jeremy Hammen, U.S. Fish & Wildlife Service, Columbia Fish & Wildlife Conservation Office; Jason Breeggemann, U.S. Fish & Wildlife Service, Green Bay Fish & Wildlife Conservation Office; Pablo Oleiro, Missouri Department of Conservation; Jeena Credico, U.S. Fish & Wildlife Service, La Crosse Fish & Wildlife Conservation Office; Jason Goeckler, U.S. Fish & Wildlife Service, Columbia Fish & Wildlife Conservation Office; Wyatt Doyle, U.S. Fish & Wildlife Service, Columbia Fish & Wildlife Conservation Office
ABSTRACT: Techniques that effectively capture all sizes of invasive carp are integral to addressing management of these nuisance fish. Several researchers have noted that Asian carp, specifically Silver Carp, can be difficult to capture using standard sampling techniques. The U.S. Fish & Wildlife Service, Columbia Fish and Wildlife Conservation Office developed three trawling methods to target invasive carp: an electrified butterfly frame trawl (paupier), a surface trawl, and an electrified push frame trawl (dozer trawl). To determine if these gears are more effective at sampling Silver Carp than standard boat electrofishing, the four sampling techniques were simultaneously deployed in Illinois River backwaters, tributaries, and side channels June through October 2016. All techniques successfully sampled Silver Carp; however, certain gears captured some size classes more readily than other gears. For example, standard electrofishing did not capture any Silver Carp less than 200 mm, while the trawls detected juvenile Silver Carp in 15% of paupier samples, 10% of surface trawls, and 3% of dozer trawls. Overall, the paupier was most consistent with 60% of the samples catching Silver Carp compared to 50% of dozer trawls, 35% of standard electrofishing samples, and 10% of surface trawls. The objectives of this study were to estimate detection probabilities for multiple size classes of Asian carp using the four sampling techniques and utilize detection probabilities to estimate effort necessary to detect each species and size class of Asian carp. This knowledge will contribute to the creation of protocols addressing detection and monitoring of Asian carp in Midwestern waters.
