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Ploidy of Backcross Hybrids of Largemouth Bass and Smallmouth Bass
Author(s) -
Gomelsky Boris,
Dabrowski Konrad,
GarciaAbiado Mary Ann,
Stilwell William,
Tidwell James H.,
Coyle Shawn D.
Publication year - 2004
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/a03-021.1
Subject(s) - micropterus , biology , hybrid , bass (fish) , backcrossing , ploidy , danio , zoology , fishery , genetics , botany , gene , zebrafish
Interspecies hybridization in fish may trigger the transformation of oogenesis in hybrid females, resulting in formation of eggs with unreduced diploid chromosome number. This phenomenon is revealed by the triploidy of backcross offspring obtained from crossing F 1 hybrid females with males of either parental species. To determine whether the F 1 hybrids of largemouth bass Micropterus salmoides and smallmouth bass M. dolomieu produce diploid eggs, we designed a study for evaluating the ploidy of backcross offspring (F 1 hybrid females × largemouth bass males). Fish ploidy was determined by flow cytometry measurement of DNA content. The results of flow cytometry analysis showed that backcross hybrids had the same amount of DNA as largemouth bass and F 1 hybrids, which suggests diploidy (2n) of backcross hybrids. This indicates that the F 1 hybrid females between largemouth bass and smallmouth bass generate haploid eggs and do not experience the transformation of oogenesis that has been described in several other distant fish hybrids. Results of this study will be used to evaluate hybrids of largemouth bass and smallmouth bass as potential candidates for aquaculture.