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Two species of the family Cichlidae, Tilapia rendalli and Geophagus brasiliensis, live at the same ecological niche and are morphologically similar. Cytogenetic study showed a diploid complement of 44 chromosomes in the former and 48 in the latter, with the N.F. of 52 and 51, respectively. The findings suggest that they have the same origin and the difference in chromosome number may be due to chromosome rearrangements.

Comparative Cytology of <i>Tilapia rendalli</i> and <i>Geophagus brasiliensis</i> (Cichlidae, Pisces)