Growth performance of Jayanti Rohu and Amur Common carp in extensive polyculture system

Composite fish culture, a multi species fish culture technology has extensively been practicing by small and marginal farmers throughout the country. Due to several biotic and abiotic reasons such as inbreeding, improper diet, environmental stress etc. farmers doesn’t get satisfactory growth of fishes. Despite of its delicacy, locally available Common carp (Cyprinus carpio) due to its bulging abdominal appearance fetches less customer demand. In the present study locally available Rohu (Labeo rohita) and Common Carp (Cyprinu scarpio) was replaced with improved variety of Jayanti Rohu and Amur Common Carp to evaluate the growth performance as well as the farm economics of the culture system. Three (3) different ponds of farmers of Kokrajhar districts of Assam were selected for the study. Advance fry of Jayanti Rohu and Amur Common Carp were supplied to them from certified seed vendor. In another fish pond locally available Rohu (Labeo rohita) and Common Carp (Cyprinus carpio) was cultured along with other carps. Fishes were fed with rice polish and mustard oil cake @ 1:1 ratio along with 1per cent vitamin and mineral mixture. Water quality parameters were maintained and health monitoring was practiced by trial netting in every fortnight. The culture practice was repeated for two years. Jayanti Rohu and Amur Common Carp showed a significant higher growth as compared to locally available Rohu (Labeo rohita) and Common Carp (Cyprinus carpio) in each farmers’ pond. Jayanti Rohu and Amur Common Carp also fetched a high market price.