Breeding depressions in culture ponds for Malaysian prawns

Breeding depressions constructed by male Malaysian prawns, Macrobrachium rosenbergii, were observed in earthen culture ponds in South Carolina. Depressions ranged from circular to elliptical in shape and the maximum size recorded was 94 × 53 cm and 15 cm deep. Number and size of depressions appeared to be closely related to the size and density of the adult male prawns in the ponds. Night-time observations indicated that sexually ripe females oriented in and around the depressions. Although construction of breeding depressions appears to be common under pond culture conditions, such depressions are not necessary for successful reproduction.