Low-Cost Diet for Monoculture of Giant Macrobrachium Rosenbergii
2011
Gupta, Akhil | Sehgal, H.S. | Sehgal, G.K.
A 135 days experiment was conducted in twelve experimental tanks (80 m²) with a view to develop new diets for giant freshwater prawn (Macrobrachium rosenbergii). Three experimental diets (35% CP) were formulated using different protein sources in different combinations and assigned to treatments D1, D2 and D3. A commercial prawn feed was assigned to CD (control diet). Juveniles M. rosenbergii (1.87±0.37 - 2.44±0.35 g) were stocked at the rate of 320 no./tank (@ 40,000/ha). The tanks were provided with aeration using air pumps. The ranges of water quality parameters recorded in different tanks were: temperature 23.3–36.3°C, dissolved oxygen 5.86–10.85 mg/l, pH 8.06–9.31, visibility 14.3–48.0 cm and salinity 0.43–0.56 ppt. The results showed nonsignificant differences in the growth performance; however, survival ranged between 63.8 and 77.7% and it was significantly higher in prawns of D1 and CD treatments, respectively. The prawn yield on treatment D1, D2, D3 and CD was 599.5±173.2, 676.5±102.5, 633.8±136.6 and 721.9±161.5 kg/ha/135 days, respectively. Feeding of diet D2 generated maximum net profit of Rs. 83,687.3/ha, which was 45.31% more profitable than by feeding CD. These results indicated that a diet containing 10% fish meal and 40% soybean meal based diet D2 may be useful for profitable monoculture of M. rosenbergii.
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