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Genetics and Molecular Biology

Print version ISSN 1415-4757

Abstract

MOLINA, Wagner Franco; MARGARIDO, Vladimir Pavan  and  GALETTI JR, Pedro Manoel. Natural triploidy in Leporinus cf. elongatus bearing sex chromosomes. Genet. Mol. Biol. [online]. 2007, vol.30, n.3, pp. 567-569. ISSN 1415-4757.  http://dx.doi.org/10.1590/S1415-47572007000400010.

Although several cases of natural triploidy in fish have already been described, spontaneous polyploidy in species with differentiated sex chromosomes are rare. We report the occurrence of a triploid fish (3n = 81) Leporinus cf. elongatus, a species characterized by a highly differentiated ZZ/ZW sex chromosome system, from the São Francisco river. The occurrence of a ZZZ triploid adult indicates the viability of this chromosome constitution in this fish.

Keywords : polyploidy; triploid fish; ZW chromosomes; sex chromosomes; Anostomidae.

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