author(s)
Hari OM Verma and Sagar C Mandal

abstract
The present experiment was conducted in rectangular cemented tanks (5 x 4 x 1m) each for five months to evaluate growth performance of amur common carp (Cyprinus carpio) and mrigal (Cirrhinus mrigala) with major carp in polyculture system. The experiment included three treatments in triplicates viz. T1: mrigal, catla (Catla catla), rohu (Labeo rohita), silver carp (Hypophthalmichthys molitrix) and silver barb (Puntius gonionotus) at 6:3:6:2:3; T2: amur common carp, catla, rohu, silver carp and silver barb at 6:3:6:2:3; and T3: mrigal, amur common carp, catla, rohu, silver carp and silver barb at 3:3:3:6:2:3. Results showed that mean weight gain and specific growth rate of mrigal and amur common carp were higher in T3 compared to T1 and T2 and that of silver carp was significantly (P<0.05) higher in T2 than T1 and T3. Net gain biomass, daily weight gain and net fish yield in T2 and T3 were significantly higher than T1. The highest net gain biomass, daily weight gain and net fish yield were obtained in T3 followed by T2 and T1. No significant differences in survivability (%) were observed among treatments. The result demonstrated that amur common carp performs better than mrigal with major carps in polyculture system and with stocking a ratio of 15% each have an improved fish production.