台灣南部海域捕獲之黃鰭鮪幼魚的體型組成與箱網短期蓄養後的成長表現

楊清閔、翁進興、賴繼昌、黃建智、吳龍靜 (2012) 。臺灣南部海域捕獲之黃鰭鮪幼魚的體型組成與箱網短期蓄養後的成長表現。水產研究，頁73-82。

       台灣周邊海域擁有豐富黃鰭鮪幼魚資源，如何善用捕獲的幼魚發展鮪類養殖，以提高捕獲幼魚的價值，為刻不容緩課題。本研究於小琉球與綠島海域進行釣獲黃鰭鮪的生物特性調查，並在小琉球海域從事釣獲黃鰭鮪幼魚之短期箱網養殖實驗，以評估黃鰭鮪箱網養殖之潛力。結果顯示，於小琉球海域釣獲之黃鰭鮪幼魚，平均尾叉長 43.9 ± 8.2 cm、體重 1.5 ± 1.2 kg、肥滿度 1.64 ± 0.13%，於綠島海域釣獲者，平均尾叉長 79.8 ± 18.8 cm、體重 10.3 ± 5.9 kg、肥滿度 1.73 ± 0.17%。經短期箱網蓄養 (約100天) 之幼魚，日比成長率 (SGR) 為 0.43 ~ 0.62%，增重量 (WG) 為 1 ~ 1.7 kg，平均飼料效率 (FE) 為 8.81%。由標識魚直接量測之成長，尾叉長每日增加 0.71 mm、每月增重 0.49 kg、脂質含量增加 4 ~ 18 倍。表示黃鰭鮪幼魚經適當蓄養肥育，可提高其肥滿度與脂肪含量，提昇市場價格。本研究有助於進一步掌握黃鰭鮪的資源動態，並可作為發展鮪魚養殖產業之參考。

       The waters surrounding Taiwan have a plenty of juvenile yellowfin tuna. The use of those fish as seeds for marine cage culture has drawn a great attention in Taiwan in recent years. Studies on size composition, condition factor and length-weight relationship of the fish caught from the coastal waters of Southern Taiwan were conducted. A short-term cage farming experiment, in order to explore sustainable tuna farming model, was carried out. Mean fork length and body weight and condition factor of fish caught from Xiaoliuque were 43.9 ± 8.2 cm, 1.5 ± 1.2 kg and 1.64 ± 0.13, respectively. On the other hand, mean fork length, body weight and condition factor of fish caught from Green Island were 79.8 ± 18.8 cm, 10.3 ± 5.9 kg and 1.73 ± 0.17, respectively. The specific growth rate (SGR) of a short-term cage cultured juveniles (about 100 days) was between 0.43 and 0.62%, the body weight gain (WG) was between 1 and 1.7 kg, and the average increase in the feed efficiency (FE) was 8.18%. The fork length increased 0.71 mm daily, the individual weight increased 0.49 kg per month, and the lipid content increased 4-18 times. The results showed that juvenile yellowfin tuna caught in the wild could increase in fatness and lipid content and its value after a short-term period of cage culture. The findings of this study could be helpful for the management of juvenile tuna resources and provide basic data for the tuna farming industry.