Effects of fermented poultry manure and sugarcane mud on pond fisheries
2002
Kausar, R.
The major carps were stocked in the ratio of 10 Catla catla, 35 Labeo rohita and 16 Cirrhinus mrigala. Pond 1 was treated with simple poultry manure at the rate of 0.1 % N of live fish body weight daily. Pond 2 was treated with fermented or EM-treated poultry manure at same rate, pond 3 was treated with sugarcane filter cakes or press mud at the rate of 0.1 % N of total body weight of fish daily, and pond 4 was supplied with rice polish and gluten (1:1) at same rate as mentioned above. All ponds were equally fertilized with inorganic, fertilizer i.e. ammonium nitrate and single super phosphate (1:1) on basis of 0.01 gm N/cm of fish length daily. Fishes were cultured for period of 180 days and during this period, samples of stocked fishes were captured fortnightly and their morphic para meters i.e. body weight, total length and fork length were measured. Similarly the water samples were also taken and their physico-chemical characteristics were analyzed. The average body weight gain was calculated as 297, 302 and 333 g respectively for Catla catla, Labeo rohita and Cirrhinus mrigala in pond 1, 262, 269 and 353 g in pond 2, 237, 348 and 360 g in pond and 267, 259 and 359 g in pond 4. Net fish yields were 2317.82, 2773.69, 2196.58 and 2148.55 kg/hectare/year respectively in P1, P2, P3 and P4 whereas the gross fish production was recorded as 4549.53, 4457.93, 4606.20 and 4341.5 kg/hectare/year respectively. Manure/feed conversion efficiencies were calculated to be 0.27, 0.34, 0.158 and 0.297, respectively in P1, P2, P3 and P4. Nitrogen incorporation and conversion efficiency was calculated as 4.53 and 0.13, respectively in P1, 5.08 and 0.15 in P2, 3.67 and 0.105 in P3 and 5.39 and 0.14 in P4. Temperature in all the experimental ponds remained between range of 28.0 and 31.5 degree C. pH value ranged from 7.85 to 8.25. Light penetration varied from 12.50 cm to 25.50 cm in all ponds. The dissolved oxygen values fluctuated between the range of 2.7 mg/l to 5.5 mg/l in all the experimental ponds. Observation made on biomass showed variation experimental period. Total dissolved solids were positively correlated with total solids and were negatively correlated with planktonic biomass. Total solids are positively correlated with bicarbonates. They were negatively correlated with electrical conductivity.
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