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Tuesday, January 30 • 6:00pm - 9:00pm
Poster Display. The Presence of Young-of-Year Asian Carp Found in Native Piscivores Fish Diets in Lower Pool 19 and Its Tributaries

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AUTHORS: Charmayne Anderson, Jim Lamer, Katie Manor, Ashley Stanley - Department of Biological Sciences, Western Illinois University; Brent Knights, Upper Midwest Environmental Sciences Center, US Geological Survey

ABSTRACT: The movement of invasive Asian carp through Lock and Dam 19 (LD19) on the Upper Mississippi River is restricted as compared to downstream dams. Abundance and reproduction above the dam is relatively low. In 2016, a “rare” recruitment event for Asian carp occurred above LD19 providing us an opportunity to see how native predators in this reach used this novel forage base. Our objectives were to determine the importance and size of Asian carp being consumed. Native predators were collected with electrofishing and tandem fyke nets from Pool 19. We removed the diets from 23 species of native piscivores (n=726). White bass (Morone chrysops), largemouth bass (Micropterus salmoides), shortnose gar (Lepisosteus platostomus), channel catfish (Ictalurus punctatus), bowfin (Amia calva), and longnose gar (Lepisosteus osseus) represented the majority of species. Stomach contents were identified to the lowest possible taxonomic unit.  Evidence of silver carp consumption by multiple species was documented. Channel catfish contributed 11% of its diet by weight in Asian carp and 18% of Asian carp frequently occurred in largemouth bass diets. Comparing our results to similar studies of predator-prey dynamics between reaches with emerging and established population will help better inform potential management efforts, like stocking and habitat restoration for predators, to control Asian carp in the Upper Mississippi River.

Tuesday January 30, 2018 6:00pm - 9:00pm CST
Ballroom C & Foyer

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