This plan was in order to improve the survival rate of yellowfin tuna and clarify the reason that was attributed to the air bubbles formed in tuna’s eye, resulting in blindness and death. Were the depth and water quality of pond connected to this syndrome? The large-pond for tuna broodstock was built and the recirculated system was under arrangement. It had 18 meters in diameter and 6 meters in depth and the total water demand reached 1500 tons. We had cultured 39 1+.-year- old yellowfin tuna in this pond and the survival rate was 93.75% after one month stocking. The water quality of pond included that pH value was between 8.1to 8. 2 and total nitrogen and total phosphorus amounts were low levels. The results revealed that this recirculated system was adapted for yellowfin tuna broodstock culture.