Morphotypes vis-a-vis genetic parameters of <I>Catla catla</I> (Ham.) and <i>Labeo rohita</i> (Ham.) backcrosses

Abstract

Backcross generations of Catla catla (Ham.) and Labeo rohita (Ham.) were developed in Central Agricultural Research Institute, Port Blair, South Andaman, India, using the technique of induced breeding for Indian Major Carps. The trend of morphometry through generation mean analysis indicates reduction of head size with respect to standard length, which is considered as a reduction of bone size within whole body biomass. The segregation pattern of dominant head morphometries of rohu and partial dominance of body morphometries of catla was supported by subsequent genetic evaluation through karyotyping, biochemical analysis and PCR-random amplified polymorphic DNA (RAPD) based molecular marker analysis indicating more genetic proximity of rohu with backcrosses than catla. The present study is significant for carp genetics with special reference to catla and rohu.

Keywords: Backcross, catla, esterase, karyomorphology, molecular marker, morphometries, rohu.

African Journal of Biotechnology Vol. 12(36), pp. 5503-5512