INCREASED STOCKING DENSITY OF GIANT FRESHWATER PRAWN (Macrobrachium rosenbergii, de Man 1879) POSTLARVAE IN HAPA NETS WITH DIFFERENT SUBSTRATE POSITIONS

Dominador F. Bacalso, Jr.

Abstract


Decapod crustaceans is vulnerable to different environmental fluctuations. Thus, a variety of farming systems have been made by shrimp growers to solve these problems. This study assessed the survival, growth rate and interaction effect of stocking density and substrate positions of giant freshwater prawn (Macrobrachium rosenbergii, de Man 1879) postlarvae when cultured in experimental framed hapa net installed in pond for 90 days. Three stocking densities were used in different substrate positions in 3 replicates stocked in 27 framed hapa nets. Results revealed lowest stocking density apparently showed better growth and bigger prawns compared to higher stocking density. Further, the mean growth of the commodity, size class distribution were significantly influenced by the stocking density. Survival rate, on the other hand, favored lower stocking density. No interaction effect among treatments was observed. Feed Conservation Ratio (FCR) improved with low stocking density. Moreover, densities of 20 pieces/m3 favored the better growth and survival rate of M. rosenbergii even with or without substrates. Shorter culture period affected the production yield.

Keywords


framed hapa net culture, giant freshwater prawn, Macrobrachium rosenbergii

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References


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