Optimization of the stocking parameters for mud spiny lobster Panulirus polyphagus (Herbst, 1793) capture-based aquaculture in tropical open sea floating net cages

Mud spiny lobsters, Panulirus polyphagus (Herbst, 1793), were reared at four different stocking sizes and stocking densities in open sea cages to evaluate their effects on growth performance. To evaluate the effect of stocking size on the growth performance, the lobsters were segregated into four different treatment groups according to size and were stocked at a density of 300 animals per cage. To evaluate the effect of stocking density on the growth performance, lobsters of 81-100 g were stocked in four different stocking densities, i.e. 16/m(2), 24/m(2), 32/m(2) and 40/m(2). The results showed that the growth rate of (60-80 g) size group, was significantly higher compared to the size groups, i.e. 101-120 g and 121-140 g comprising of larger individuals. The final body weight, though significantly higher in 81-100 g as compared to 60-80 g, the growth performance (i.e. weight gain percentage (WG %) and specific growth rate (SGR)) were not significantly different. The density-dependent influence on growth performance was evident in this study. The WG % and SGR during 90 days' culture period was significantly higher in 24/m(2) compared to other groups. This study provides crucial information about the appropriate stocking density and stocking size of lobsters at the field level, which would help to promote sustainable lobster cage farming by maximizing the production potential of the system.