Chromosomal Analysis on A Few Species of Ornamental Fishes

Abstract

Karyology deals with the chromosome morphology and behaviour during cell cycle. Every organism is characterized by its own specific chromosomes both in number and morphology. Generally fish have been the subject of investigations for their systematic, mutagenesis and culture. The cytogenetic and karyomorphological studies would are aid in the improvement species including ornamental species. Currently, aquarium fish being ornamental gain new importance as a small scale industry product and the ability as in and established to be a balanced entry with great marketability. The present study has been carried out to provide some karyological information on the economically important ornamental fish species. The method of Kligerman and Bloom (1997) was standardized for the chromosome preparations. Chromosome spreads were made for gill, and kidney tissue. Well spread metaphase spreads were photographed from gill tissues. The diploid chromosome numbers were determined for the 8 ornamental fish species. Gymnocorymbus ternetzi 2n = 48; Hemigrammus armstrongi 2n =50; Lobeo bicolor 2n=54; Puntius gelius 2n =52; Betta aplendens 2n = 50; Colisa lalia 2n=68; Trichogaster leeri 2n =66 and Trichogaster trichopterus 2n=72. And it is provided the information on the variations in size, number, karyomorphological or structural variation and staining have been discussed in view of adaptive and evolutionary significance.