B- chromosomes in Gymnocorymbus ternetzi (Boulenger)

Karyological analyses of fish are important in terms of systematics and aquaculture. on this basis,the present study is aimed at analysing the metaphases of an ornamental fish,gymnocorymbus ternetzi,for the presence of b chromosomes,an evolutionarily significant genetic element. interestingly,the present study revealed the presence of b chromosomes in the metaphases,in the range of 0-2. the frequency of b chromosomes was found to be higher in females (1.06) than males (0.81). this is the first report on the existence of b chromosomes in g.ternetzi. importance of b chromosomes are discussed.