Karyotype Studies in Two Cyprinids

Abstract

Karyotype of both Labeo gonius and Labeo dero is characterised by the presence of 54 rod shaped chromosomes. The primary and secondary spermatocytes have 27 rounded chromosomes of approximately the same size. In a number of cyprinids a varying number of V-shaped chromosomes have been reported, in addition to rods. Considering each V-shaped chromosome equivalent to two rods in which centric fusion has taken place, it is suggested that originally the cyprinids had 54 rods, a karyotype very much like the one described here in Labeo species.