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Welcome to the technical sessions schedule for the 2015 SEAFWA Annual Meeting.

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Tuesday, November 3 • 8:00am - 8:20am
Effects of Silver Carp Introductions on White Crappie and Largemouth Bass in Floodplain Lakes of the Yazoo River Basin, Mississippi

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Nathan Aycock, Darrin Hardesty, Jerry Brown, Chad Washington – Mississippi Department of Wildlife, Fisheries and Parks

The invasive silver carp continues to quickly expand its range throughout the United States. Studies have shown the negative effects these fish can have on native planktivores in large river systems, yet their effect on sport fish species is less well known, especially in floodplain lakes connected to large rivers. During the historic flooding of the Mississippi River in 2011, silver carp juveniles gained access to some oxbow lakes in the Yazoo River Basin where they had previously not been present. MDWFP sampling from pre-flood and post-flood indicates substantial changes to the white crappie population at these lakes after silver carp entered the system, including decreased abundance, decreased growth rates, and significantly lower relative weight values. In other nearby floodplain lakes where silver carp are not present, crappie abundance either remained the same or increased after the flooding, and there was no change in fish condition. Similar trends in abundance was found for largemouth bass, with numbers falling dramatically for the lakes where silver carp were introduced and number increasing or staying the same for the lakes where silver carp were not introduced. A decrease in prey species abundance, especially gizzard shad and bluegill sunfish, after silver carp introductions may be driving these trends. Our data shows the dramatic impact silver carp can have on sport fish populations in floodplain lakes.

Tuesday November 3, 2015 8:00am - 8:20am EST
Victoria

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