The ongrowing phase starts after the young are trained to feed on dead food, which is the critical period for aquaculture. The daily growth rate is 1.4 % in length and 3.4 % in weight, throughout the culture period of 210 days. The final size varies depending on the culture conditions, e.g. temperature, nutritional content of food, period of training, etc. Less than 500 g weight of the cuttlefish is required for the frozen food industry (Nabhitabhata 1995). The culture period is recommended to be about 150–210 days with harvest before spawning. Live cuttlefish of similar size are required for the home aquarium trade. Live feed required in the nursing phase is the bottleneck for large-scale aquaculture. However, the large-scale production of live feed and the additional enriched Artemia is feasible. The feasibility of producing artificial feed for the ongrowing phase is higher than that for the nursing phase.