Abstract
The present study was conducted during June to December, 2010 with a view to developing a nursery technology with respect to stocking density optimization and survivability of prawn PL in earthen ponds. Hatchery obtained PL were reared with commercial nursery feed and monitoring of water quality for 14 weeks in 12 ponds (1.25dec each) at Khulna University. Four densities viz., 958, 500, 800 and 1000 PL/dec were used with three replicates in each. The range of temperature, DO, pH, alkalinity, hardness, ammonia and phosphate during the study were within the acceptable limit. The mean initial weight of prawn PL was 0.005g. Net gains in weight were 2.069, 4.042, 2.680, and 1.707g from the four treatments, respectively. The mean values of specific growth rate of the PL were 3.192, 3.550, 3.332 and 3.090% per day from the four densities, respectively. Highest values of growth rate and survival rate were found in 500 PL/dec density. Second highest values of the same were found in 800 PL/dec. However, a density of 500- 800 PL/dec may be used for better growth and survivability in the prawn nurseries, though there are scopes for further improvement of the process through feeding trial and/or other aspects.
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