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Tuesday, January 30 • 8:00am - 8:20am
ASIAN CARP & OTHER AQUATIC INVASIVES: Recruitment Sources of Silver Carp in the Ohio River Basin Using Otolith Microchemistry

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AUTHORS. Aaron Schiller, Greg Whitledge – Center for Fisheries, Aquaculture, and Aquatic Sciences, Southern Illinois University; Brent Knights, USGS Upper Midwest Environmental Sciences Center

ABSTRACT. Knowledge of natal environments and dispersal of Silver carp (Hypothalmichthys molitrix) inhabiting the Ohio River and Kentucky and Barkley Lakes would inform development of strategies to control established and emerging populations.  However, the principal natal environments supporting the emerging bigheaded carp population in the Ohio River basin are unknown.  There is also a need to assess the role of tributaries as nursery sites to increase understanding of dispersal patterns and better target young fish. The goal of this study was to identify recruitment sources and determine dispersal patterns of Silver carp in the Ohio River basin by analyzing otolith core trace element and isotopic compositions relative to ambient water elemental and isotopic measurements.  Fish were collected from the Ohio River, and Kentucky and Barkley Lakes from 2014-2017 and water samples were taken during summer 2012-2017. Water samples maintained temporal stability and spatial differentiation for the Ohio River and tributaries during the sampling period.  Results to date suggest that most Silver carp in the Ohio River are utilizing tributaries during early life. Results will inform development of efforts to target and remove spawning and young bigheaded carps. 

Tuesday January 30, 2018 8:00am - 8:20am CST