The literature was reviewed to determine the number of fertile, interspecific fish hybrids produced naturally and artificially. A total of 130 interspecific, natural crosses resulted in fertile F1 hybrids, and 150 artificially produced interspecific crosses produced fertile F1 hybrids. The validity of species concepts with reproductive isolation in their definition is questioned. The presence of fertile hybrids in 45 intergeneric crosses makes their current classification questionable.
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Argue et al. (1999) studied this question.
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