Abstract
A six month’s experiment was carried out in earthen ponds to evaluate the effect of micro and macro nutrients on the growth performance of Prawn (Macrobrachium rosenbergii), Rohu (Labeo rohita) and Mola (Amblypharyngodon mola) in a polyculture system during July to December 2017. The trial was conducted into two different treatments and one control each with three replications. In treatment-1, macronutrients enrich fertilizers like urea, TSP and molasses-yeast mixture were applied at the rate of 2.45, 2.45, and 3.09 (g m-2 week-1), whereas in treatment-2 micronutrients composition mixer applied at the rate of 4.50 g m-2 week-1 while no micro and macronutrients were applied in control. The mean value of all water quality parameters showed no significant differences among control and two treatments when One-way ANOVA was performed except hardness. The average final mean individual weights of prawn, rohu and mola in control, treatment-1 and treatment-2 were 22.10, 24.35, and 24.70 g; 141.10, 190.60 and 182.20 g; 3.36, 3.67 and 3.73 g, respectively. The survival rates of various species namely prawn, rohu and mola in control, treatment-1 and treatment-2 were 73.33, 89.58 and 86.25%; 78.00, 74.00 and 74.00%; 10.67, 15.33 and 15.33%, respectively. There was no significant difference in the survival rates of prawn, rohu and mola among control and treatments. Production after six months of culture was 351.8, 461.5 and 445.3 kg ha-1 in control, treatment-1 and treatment-2, respectively which were significantly different at 5% level of significance.
 Int. J. Agril. Res. Innov. & Tech. 8 (2): 47-53, December, 2018
Highlights
Bangladesh is blessed with huge water resources with a wide range of aquatic diversity
The concept of prawn (M. rosenbergii), rohu (L. rohita) and mola (A. mola) polyculture rests on the idea that when compatible species of different feeding habits are cultured in the same ponds, the maximum utilization of all the fish food of different column of the ponds is established
Optimizing production in pond fish culture by the use of fertilizers is an important task as plankton is the basic food of all the organisms living in the water and fishes and other aquatic organisms depend on this basic food directly and indirectly
Summary
Bangladesh is blessed with huge water resources with a wide range of aquatic diversity. The macro and micronutrient enrich fertilizer can be an effective tool to enhance the production of prawn (M. rosenbergii), rohu (L. rohita) and mola (A. mola) in polyculture system. Stocking density of prawn (M. rosenbergii), rohu (L. rohita) and mola (A. mola) were same in all treatments shown in the Table 1.
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