農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

本計畫目的是進行黃鰭鮪種魚培育及開發養殖技術，以期能發展鮪類養殖的產業。目前種魚池中共蓄養53尾黃鰭鮪，生長情況良好，每日平均投餌量，已由1月的5公斤，增加到10月份的15.5公斤。目前循環系統運作正常，池水透明度佳，清澈見底，水質方面，整體水質仍維持不錯，總鹼度、總氮及硝酸鹽類無明顯增加，僅磷酸鹽類增加約3倍，pH值維持7.5，均在正常標準範圍內。在試驗麻醉抽血部分，由於採血死亡率高(50%)，僅採1~3年齡魚各1尾，未來將不再進行此試驗。今年自野外釣獲一入39尾幼魚，死亡17尾，存活率56%，其體型均瘦小且胃內無餌料，可能是體型小，受大魚干擾不易攝餌，造成死亡率較高。在計畫中，以陸上循環過濾養殖池來培育黃鰭鮪種魚是可行的，只要妥善照顧，相信不久後黃鰭鮪定能在池中自然產卵。

The purpose of this investigation is to successfully rear yellow fin tuna (Thunnus albacares) breeder candidates and develop tuna industry-oriented culture techniques. At present, 53 tuna (2-4 years old) are culture in a 1500 m3 round concrete recirculating tank system. The daily feed weight has gradually increased from 5 kg per day in January to 15.5 kg per day in October. Throughout all this study, ranges of water quality parameters were: temperature, 27-30°C; total alkalinity, 261-294 mg L-1; total ammonia nitrogen (TAN), 0.01-0.15 mg L-1; Nitrite (NO2-N), 0.01-0.04 mg L-1; Nitrate (NO3-N), 9.09-19.69 mg L-1 and phosphate, 0.196-0.997 mg L-1. For handling and blood sampling procedure, tuna fish were anesthetized but still resulting in high mortality rate (>50%). Additionally, 39 (1 year old) tuna were stock with older tuna in same tank. Due to size differences, survival rate of 1-year old tuna was 56%. Recirculating systems for stocking yellow fin breeders has shown promising results. We expect to have natural spawning of yellow fin tuna in recirculating pond systems.