ZAKI, M., ABDEL-HALIM, A. (1997). GROWTH OF FRESHWATER PRAWN (MACROBRACHIUM ROSENBERG!) UNDER DIFFERENT ORGANIC FERTI-LIZATION REGIMES AND STOCKING DENSITIES. Egyptian Journal of Agricultural Research, 75(1), 283-293. doi: 10.21608/ejar.1997.403243
MOHAMED A. A. ZAKI; ABDEL-RAHMAN M. M. ABDEL-HALIM. "GROWTH OF FRESHWATER PRAWN (MACROBRACHIUM ROSENBERG!) UNDER DIFFERENT ORGANIC FERTI-LIZATION REGIMES AND STOCKING DENSITIES". Egyptian Journal of Agricultural Research, 75, 1, 1997, 283-293. doi: 10.21608/ejar.1997.403243
ZAKI, M., ABDEL-HALIM, A. (1997). 'GROWTH OF FRESHWATER PRAWN (MACROBRACHIUM ROSENBERG!) UNDER DIFFERENT ORGANIC FERTI-LIZATION REGIMES AND STOCKING DENSITIES', Egyptian Journal of Agricultural Research, 75(1), pp. 283-293. doi: 10.21608/ejar.1997.403243
ZAKI, M., ABDEL-HALIM, A. GROWTH OF FRESHWATER PRAWN (MACROBRACHIUM ROSENBERG!) UNDER DIFFERENT ORGANIC FERTI-LIZATION REGIMES AND STOCKING DENSITIES. Egyptian Journal of Agricultural Research, 1997; 75(1): 283-293. doi: 10.21608/ejar.1997.403243
GROWTH OF FRESHWATER PRAWN (MACROBRACHIUM ROSENBERG!) UNDER DIFFERENT ORGANIC FERTI-LIZATION REGIMES AND STOCKING DENSITIES
1Faculty of Agriculture, Alexandria University, Egypt
2Central Laboratory for Aquaculture Research, Agricultural Research Centre, Giza, Egypt
Abstract
Two experiments were conduted to determine growth of fresh water prawn under different fertilization regimes. In the first experiment, seven brick lined earthen ponds measuring 5 x 11 x 1.8 m were used. Organic fertilzer was obtained from either 4, 8, or 12 ducks kept in 2x2x1 m cages fixed over each pond allowing litter to drop directly into the water through a wire bottom. Two ponds were assigned for each of the three treatments, and the seventh pond was used as a control. A ten cm sand layer was prepared to provide suitable environment for the prawns which were stocked at a rate of 500 individals/pond (9.09/m2). In the second experiment, eight earthen channels measuring 2x10x1.3 m were used in two replicates. Prawns were stocked at a rate of 50, 75, 100 and 12S individuals per channel. Fifty gramme dry chicken litter/ channel were added daily. Average individual prawn weight was 0.2 g, in the two experiments. Twenty percent of the water volume was replaced daily and the duration of the work was 84 days. !creasing the number of ducks per pond resulted in decreased average daily gain (ADG), specific growth rate (SGR %) and increasing prawn mortality. The the best rate was one duck /14 m2. Higher dry matter (DM%), crude protein (CP%), fat (EE%), and energy content were obtained from ponds receiving droppings of 4 ducks (12.7 g litter/day/m2) With the fixed rate of chicken litter, increasing stocking rate resulted in decreased ADG, SGR% and incrasing prawn mortality. The best result was obtained with 50 prawn/channel (2.5 prawn/m2).
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