Production and Growth Performances of Carps in Different Stocking Densities of Polyculture

4 Abstract: An experiment was conducted to compare the performances of different carps i.e. rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus cirrhosus) and silver carp (Hypophthalmicthys molitrix) in different stocking densities of polyculture. Three treatments each with three replicates were maintained and the stocking densities of carps were 40, 80 and 160 per decimal in T , T and T respectively. The ratio of 12 3 stocking for rohu, catla, mrigal and silver carp was 2:3:2:1. Ponds were fertilized regularly, commercial feed was given for first 10 days; the mixture of rice bran and wheat bran was given for 80 days as supplemental feed. The water quality parameter such as pH, temperature, dissolved oxygen and transparency were observed fortnightly. The obtained results showed that the highest weight was gained at 176.33±15.76 g in treatments T by silver carp, followed by mrigal (106.79±14.23 g), catla (73.5±32.80 g) and rohu (52.71±6.03 g). Similarly, the 1 highest length was obtained in treatment T by rohu at 13.07±0.59 cm followed by catla at 13.4±2.1 cm, mrigal 1