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Monday, January 29 • 3:20pm - 3:40pm
ASIAN CARP: Using Microchemistry and Stable Isotopes to Determine Natal Origin and Movement of Asian Carp in Pools 16-19 of the Mississippi River

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AUTHORS. Charmayne Anderson, Jim Lamer, Cortney Cox - Department of Biological Sciences, Western Illinois University; Greg Whitledge, Neil Rude - Department of Zoology, Southern Illinois University; Brent Knights, Upper Midwest Environmental Sciences Center, US Geological Survey

ABSTRACT. Asian carp are an invasive species in the US and have spread throughout most of the Mississippi River Basin.  Expansion above Lock and Dam 19 on the Upper Mississippi River has been impeded by the high head dam at this location, which restricts all passage to the lock chamber.  To determine the extent of reproduction and recruitment above LD19 and to determine the relative contribution of tributaries and other habitats above and below the dam to the upper UMR populations, we used stable isotope otolith (lapillus) microchemistry on 150 bighead carp (75 male, 75 female) and 150 silver carp (75 male, 75 female) collected from Pools 16-19 in the Upper Mississippi River.  Fish isotope (d18O) and elemental ratios (Sr:Ca and Ba:Ca) were compared to established water isotope and elemental ratios throughout the basin to understand the spatial and temporal history of each fish.  Mixed natal environments above and below LD19 were observed with more than 70% of silver carp and bighead carp collected from Pools 17 and 18 had natal environments below LD19. We hope to use this as a tool to monitor the effectiveness of removal efforts and monitor reproduction above LD19.

Monday January 29, 2018 3:20pm - 3:40pm
103A