This study is planned to rear a broodstock of yellowfin tuna which with the abundant juvenile resources in south-western coastal sea in Taiwan. Wild-caught juvenile will be transferred to land-based pond for broodstock cultivation. Sixty-one tuna juvenile were caught in Herng-Chuen coastal sea. Survival rate is 47.5% after one month stocking in the pond. Until now, the problems of broodstock management include the bubble-formed in the eye, lice infection and growth of micro-algae bloom. In addition, it is found that the survival is high in the low water temperature stage. High mortality is found in summer stage while water temperature is high and light intensity is strong in outdoor pond only with simple black shade cloth above the pond, resulting in the diatom bloom. Currently the construction of large-pond for broodstock is finished and the re-circulated system is under arrangement. It is hoped that the survival rate of cultured tuna can be improved in large pond with covering to prevent from heavy rainfall and strong sunlight.