Abstract

The present study was conducted to evaluate the effects of inorganic fertilizers in combination with constant supply of supplementary feeds on growth and production of exotic carps for a period of one year, from February 2007 to January 2008. Three treatments namely T1 {Urea + TSP (2 : 1), 40 kg/ha}, T2 {Urea + TSP (2 : 1), 60 kg/ha} and T3 (Urea + TSP (2 : 1), 80 kg/ha}, each in triplicates were used in the present study. Fertilizers were applied over the ponds fortnightly. The fishes were stocked @ 10,000 fry/ha with a combination ratio of 4 silver carp, 3 common carp and 3 grass carp. A mixture of supplementary feeds composed of rice bran, wheat bran and fish meal (40 : 40 : 20) were provided in all the treatments @ 5% body weight of fish twice daily. The average length (cm) and weight (g) gain were the highest in silver carp (32.3 ± 0.05 cm and 591 ± 1.37g) in treatment T3 and the lowest in grass carp (24.5 ± 0.05 cm and 509.5 ± 0.92 g) in treatment T1 . The highest survival rate (%) was incased for silver carp (81.25%) in treatment T3 and the lowest in grass carp (66.67%) in treatment T1 . The maximum production of all the fishes was recorded in treatment T3 (1920, 1304 and 1164 kg/ha/year respectively), followed by the treatments T2 (1766, 1176 and 1084 kg/ha/year respectively) and T1 (1684, 1108 and 1022 kg/ha/year respectively). The water quality parameters such as temperature (°C), dissolved oxygen (mg/l), pH and transparency (cm), of all the experimental ponds were found within the productive range, which is suitable for fish culture.DOI: http://dx.doi.org/10.3329/pa.v19i2.16953 Progress. Agric. 19(2): 129 - 137, 2008

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