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Tuesday, October 18 • 9:00am - 9:20am
Fisheries. Allozyme and Microsatellite Assessment of Largemouth Bass (Micropterus salmoides) Introgression in Louisiana Lakes

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AUTHORS: Tiffany E. Pasco, Debra G. Kelly, A. Raynie Harlan, Sabrina S. Taylor, William Kelso, Michael Kaller - Louisiana State University Agricultural Center, School of Renewable Natural Resources

ABSTRACT: Louisiana has been stocking Florida Largemouth Bass (Micropterus salmoides floridanus) since 1982 to improve the overall size composition and trophy potential of the state’s largemouth bass fisheries. To monitor stocking effects on genetic composition of native Largemouth Bass (Micropterus salmoides salmoides), we have genotyped bass from over 65 lakes across the state over the last 30 years with two diagnostic allozymes (IDH and AAT). More recently, we analyzed genetic composition of bass from 5 lakes with both allozymes and 12 microsatellite loci to further examine the: 1) extent of introgression of Florida Largemouth Bass into the native Largemouth Bass populations; 2) sensitivity of allozymes versus microsatellites in detecting Fx hybrids, and; 3) potential effects of differences in these datasets on development of fisheries management strategies. Preliminary results from the 5 water bodies indicate general agreement between the two genotyping methods regarding identification of low, medium, and high introgression lakes. Further, microsatellites suggest minimal introgression in Finch and Yucatan lakes (never stocked by the Louisiana Department of Wildlife and Fisheries) and the Atchafalaya River Basin (minimal stocking relative to water body size), and high, but lake-specific introgression in False River (extensive stocking history, primarily hybrids with greater ancestry from native LA Largemouth Bass) and Caney Creek Lake (extensive stocking history, primarily hybrids of Florida Largemouth Bass ancestry). Additional data analyses from three more lakes are on-going.

Tuesday October 18, 2016 9:00am - 9:20am
Riverview A

Attendees (6)