Effect of Feed Supplementation in Growth Response of Carps under the Influence of Ammonium Nitrate

The experiment was planned to observe the growth response of carps towards rice polish and maize gluten supplementation in ammonium nitrate fertilized ponds. Two earthen ponds were selected and each pond was stocked with 15 Silver carp (Hypophthalmichthys molitrix), 25 Rohu (Labeo rohita) and 15 Mori (Cirrhinus mrigala) with a total number of 55 fishes. Pond 1 was treated with ammonium nitrate and rice polish while pond 2 was treated with ammonium nitrate and maize gluten. Total net fish production of pond 1 and pond 2 was remained 1104.3 and 1374.2 kg/ha/year, respectively. Gross fish production/ha/year of Hypophthalmichthys molitrix, Labeo rohita, Cirrhinus mrigala was 1163.9 kg and 1424.0 kg in pond1 and pond 2. The physico-chemical parameters were measured on weekly basis. Temperature, pH, light penetration and planktonic biomass showed non-significant relationship. Pond 2 which was treated with ammonium nitrate and maize gluten showed 2.69 times greater fish growth than pond 1 which was treated with ammonium nitrate and rice polish.