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North American Journal of Aquaculture 2004; 66: 133-136
doi: 10.1577/A03-021.1

Ploidy of Backcross Hybrids of Largemouth Bass and Smallmouth Bass

Boris Gomelsky*
Aquaculture Research Center, Kentucky State University, Frankfort, Kentucky 40601, USA

Konrad Dabrowski and Mary Ann Garcia-Abiado
School of Natural Resources, Ohio State University, Columbus, Ohio 43210, USA

William Stilwell, James H. Tidwell, and Shawn D. Coyle
Aquaculture Research Center, Kentucky State University, Frankfort, Kentucky 40601, USA



The results of our study will be used in the evaluation of F1 hybrids of largemouth bass and smallmouth bass as potential candidates for aquaculture. It is known that rearing of fertile distant hybrids may result in genetic contamination of parental species, since escaped hybrids may cross with fish from natural populations. If F1 females produced diploid eggs, the Fb progeny would have been represented by sterile triploids. However, the diploidy of backcross hybrids of largemouth bass and smallmouth bass revealed in the present study indicates that these fish will be fertile, and therefore the rearing of F1 hybrids may have negative genetic consequences.Transactions of the American Fisheries Society 1991; 120: 283-289
doi: 10.1577/1548-8659(1991)120<0283:MHANAI>2.3.CO;2



Multispecies Hybridization among Native and Introduced Centrarchid Basses in Central Texas

DONALD C. MORIZOT, STUART W. CALHOUN, LISA L. CLEPPER, and MAUREEN E. SCHMIDT
The University of Texas, M. D. Anderson Cancer Center, Science Park, Research Division, Post Office Box 389, Smithville, Texas 78957, USA

J. HOLT WILLIAMSON
U.S. Fish and Wildlife Service, Denver Federal Center, Post Office Box 25486, Denver, Colorado 80225, USA

GARY J. CARMICHAEL
U.S. Department of Agriculture, Agricultural Research Service, Catfish Genetics Research Unit, Post Office Box 38, Stoneville, Mississippi 38776, USA



Allele-frequency differences at 11 polymorphic protein loci provided discrete genetic markers with which to estimate the extent of hybridization among native and introduced centrarchid basses in central Texas streams. Native Guadalupe bass Micropterus treculi and northern largemouth bass M. salmoides salmoides now coexist with introduced Florida largemouth bass M. s. floridanus and smallmouth bass M. dolomieui in these streams. Interspecific hybridization was detected in three of four populations from the Blanco and San Marcos rivers, hybrids making up at least 31.8% of the individuals sampled. Complex hybridization patterns were evident, because F1, F2, and backcross hybrids were detected. At least one individual exhibited genetic markers of largemouth, smallmouth, and Guadalupe bass. Extensive multispecies hybridization threatens the survival of the endemic Guadalupe bass.