Multi-stage rotational stocking and harvesting system for year-round culture of the freshwater prawn, Macrobrachium rosenbergii
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Multi-stage rotational stocking and harvesting system for year-round culture of the freshwater prawn, Macrobrachium rosenbergii

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    This report calls attention to the drawbacks of the continuous stocking and harvesting by seining! management system that is practiced in rarely drained commercial prawn ponds and presents theoretical considerations and a description of an alternative system which can be used to overcome many of the drawbacks. The alternative management system is predicated on variable density culture during growout stages, stock division, manipulation, and size-​grading. Results of laboratory-​level experimentation suggest that the degree of animal to animal competition that develops within populations is underestimated under the current management system; large animals suppress the growth of smaller ones which have a high compensatory growth potential once they are consistently and periodically removed into their own size-classes. Moreover, the prawn sexual dimorphic growth pattern is ineffectively managed so theoretical arguments are presented for the possibility of practicing unisex culture or culture involving skewed sex ratios and also the harvesting of males and females at different times. Implementing the alternative system will depend on the development of appropriate hardware for accurate sampling, sorting by size, high density culture during juvenile stages, and unisex culture and considerably improves the accountability of stock not possible under current management practices. It is hoped that culturists and researchers will begin to closely examine aspects of both the theoretical and physical components of the alternative system and test them in currest research efforts and production practices
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