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Abstract
Genetic diversity and population structure of Cirrhinus mrigala from peninsular riverine systems of India was studied using mitochondrial DNA gene, cytochrome b and truss morphometric analysis. Analysis of 982 bp of the cytochrome b gene from 182 samples collected from six rivers revealed the presence of 28 haplotypes with overall high haplotype diversity value of 0.78981 and nucleotide diversity value of 0.00215. Analysis of molecular variance (AMOVA) showed that genetic variation is mainly harbored within populations rather than among populations. The pairwise Fst values (−0.009 to 0.084) was indicative of a low genetic structure among mrigal populations. Morphometric examination of 243 samples using 10 truss landmarks and principal component analysis showed a similar trend when compared with genetic data. Overall, low genetic and morphometric differences were observed despite those populations from different geographic locations. The results of this study would provide essential information to resource recovery and help in delineating populations for fishery management. Besides, the data will provide a valuable baseline for further investigations on the geographic distribution of this commercially important fish species.
Acknowledgements
The authors are grateful to the Indian Council of Agriculture Research, Government of India, for financial support. The authors are thankful to the Director, Central Institute of Freshwater Aquaculture for providing facilities to work. Special thanks are due to Scientist-In-Charge of Regional research Centre of Central Institute of Freshwater Aquaculture at Bangalore and Vijayawada for facilitating wild sample collection. Assistance by Dr. G. Gopikrishna, Principal Scientist, CIBA, Chennai during data analysis is duly acknowledged.