Effect of different levels of cowdung on growth performance of major carps i.e. Labeo rohita, Catla catla and Cirrhinus mrigala
2001
Sughra, F.
The experiment was conducted to assess the effect of different levels of organic manure (cow dung) on the growth performance of major carps (Labeo rohita, Catla catla and Cirrhinus mrigala). The experiment was conducted for a period of 5 months in 3 earthen ponds, of dimension 25m x 8m x 1.5m (length x width x depth) at Fisheries Research Farm, University of Agriculture, Faisalabad. After preliminary preparation, all the ponds were stocked with 20 Labeo rohita, 15 Catla catla and 15 Cirrhinus mrigala. Pond 1 was kept as control pond, while the remaining two ponds were treated with different level cow dung. The treated pond 1 was manured with at the rate of 0.1 gN/100 g of wet fish body weight while treated pond 2 was at the rate of 0.15 gN/100 g of wet fish body weight per day for 5 months. The growth parameters viz., increase in body weights and total lengths of fish were monitored on fortnightly basis. Sample of fish of each species was netted out randomly from all the ponds by using nylon drag net and their growth parameters were measured and recorded. After obtaining data, fish were released back into their respective ponds. Water samples were taken (from all the ponds i.e. control, T1 and T2 separately) on fortnightly basis and were computed for the physico-chemical characteristics viz., water temperature, light penetration, pH, dissolved oxygen, carbon dioxide, total alkalinity, carbonates, bicarbonates, total hardness, calcium, magnesium, told solids, total dissolved solids and planktonic biomass. The final weight gain (1115.0 g) in all the fishes observed in treatment-l in which cow dung was added 0.1 g N/100 g of wet fish body weight daily followed by 0.15g N/100 g of wet fish body weight daily while in control (668.5 g) was observed. Gross fish production in two treated ponds (2238.803, 2265.212 Kg in T1 and T2 respectively) control pond 1338.162 Kg per hectare per year. The analysis of variance of increase in weight showed a significant difference in control and treated ponds, while non-significant difference between T1 and T2. The fish growth was obviously dependent on temperature. The maximum weight gain in control and treated ponds was recorded in September, which was due to optimum temperature. Water temperature was negatively and non- significantly correlated with planktonic biomass. And correlation between planktonic biomass and pH were found to be significant and positively correlated.
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