The waters surrounding Taiwan are rich in juvenile yellowfin tuna resources; however, the fishing of juvenile yellowfin tuna is extremely uneconomical to fishermen. In addition, the commercialized farming of tuna has not been developed, and the operating costs and risks relating to the growth and perturbation of bait efficiency in intensive tuna farming have not been accurately estimated by tuna farmers. We will study of the management cage aquaculture of tuna in Japan.