High level of hybridisation in three species of Indian major carps

Simonsen, V. and Hansen, M.M. and Sarder, M.R.I. and Alam, M.S. (2004) High level of hybridisation in three species of Indian major carps. Naga, Worldfish Center Quarterly, 27(1-2), pp. 65-69.

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Thirty individuals of each species of Indian major carps, i.e., Catla catla, Cirrhinus cirrhosus (C. mrigala) and Labeo rohita, obtained from a nursery near Mymensingh, Bangladesh were analysed by means of allozyme electrophoresis. Twenty-one loci were studied. Several loci revealed significant deviation from Hardy-Weinberg expectations caused by deficiency of heterozygotes, indicating Wahlund effects due to problems with species identification. Moreover, bimodal distributions of individual heterozygosity within the three putative species indicated hybridisation. This was confirmed using analysis of individual admixture proportions, as individuals misidentified to species and hybrids between species were observed. Furthermore, factorial correspondence analysis to visualize genetic relationships among individuals revealed three distinct groups containing misclassified individuals, along with some intermediate individuals interpreted as hybrids. Ten per cent of all C. catla and L. rohita had been erroneously identified to species, and 40 per cent of all presumptive C. catla were hybrids between C. catla x C. cirrhosus and C. catla x L. rohita. In the case of C. cirrhosus, 37 per cent of the samples were C. cirrhosus x L. rohita hybrids. Thirty per cent of all presumptive L. rohita turned out to be hybrids between L. rohita x C. catla and L. rohita x C. cirrhosus. The high incidence of hybrids in C. catla might be responsible for slower growth of the fish in aquaculture.

Item Type: Article
Title: High level of hybridisation in three species of Indian major carps
Personal Creator/Author:
Simonsen, V.
Hansen, M.M.
Sarder, M.R.I.
Alam, M.S.
Journal or Publication Title: Naga, Worldfish Center Quarterly
Volume: 27
Number: 1-2
Page Range: pp. 65-69
Date: 2004
ISSN: 1511-8533
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Hybridization; DNA; Freshwater fish; Fish culture; Allozymes; Growth; Bangladesh; Catla catla; Cirrhinus cirrhosus; Cirrhinus mrigala; Labeo rohita
Subjects: Aquaculture
Item ID: 9504
Depositing User: Mr William Ko
Date Deposited: 14 Oct 2012 08:40
Last Modified: 14 Oct 2012 08:40
URI: http://aquaticcommons.org/id/eprint/9504

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