|Abstract : Several interspecific and interganeric hybrids of Indian major carps : Catla catla, Labeo rohita, Cirrhinus mrigala and Labeo calbasu (Chaudhuri 1959, 1971 & 1973; Naseem Hamza 1971; Naseem Hamza & Alikunhi, 1971; Varghese & Sukumaran, 1971; Chondar 1977) and those of Indian major carps with exotic carps viz. common carp (Alikunhi & Chaudhuri 1959; Kowtal & Gupta 1984, Khan et al; 1986 and Gupta et al; 1986) and silver carp (Ibrahim et al; 1980) have been artificially produced through hypophysation.
From natural ecosystems such as reservoir and dry bundhs, several hybrids have been recorded (Desai & Rao, 1970; Tripathi et al; 1974, Tripathi and Sharaf 1974; Natarajan et al; 1976 & Prasad 1976). Many of these hybrids were found to be intermediate in characters of the parent species. Only a few hybrids, both artificially produced and naturally occurring, have been studied in detail for their cultural qualities and adaptability to various environments. In the present communication an account of economically important hybrids of Indian major carps have been given and their role in the development of reservoir fisheries as well as in increasing fish production in aquaculture has been discussed and use of hybrid index, multivariate techniques and genetic markers in identifying hybrids has been emphasised.