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

本研究針對2009年五月到八月間之台灣東南部海域做調查，希望透過鮪類仔稚魚之分佈狀況，進而推估鮪類之產卵場及早期生活史之相關特性。利用浮游生物網ORI進行三航次之採樣，另比較日間及夜間採樣效率何者較高，以及水平拖曳方式跟斜拖方式之漁獲量差異調查，結果顯示，採樣以夜間之水平拖曳採樣最為有效，每一網次平均生物量為30.964g，且同樣可獲得較多之仔稚魚。本研究在夜間利用水平拖曳方式共計獲得鮪類仔稚魚57尾，其中包括大目鮪3尾、長鰭鮪9尾、黃鰭鮪45尾，並無捕獲黑鮪之仔稚魚，本次調查唯一捕獲的一尾黑鮪仔稚魚係利用斜拖方式獲得。與2007年之調查相同，以黃鰭鮪之仔稚魚佔最大宗，黑鮪之仔稚魚最為少見，而長鰭鮪、大目鮪之仔稚魚樣本數量都偏低，雖然樣本數量仍然不多，但也再度證實，在春夏之際的台灣東南部海域，確實有鮪類仔稚魚的存在，這也表示鮪類之產卵場極有可能就位在台灣附近海域。

The kuroshio is a migratory pathway for tuna. This study focued onthe species composition and distribution of tuna larvae in the kuroshio waters adjacent to eastern Taiwan. Three cruises were conducted during May to August. A total of 58 tuna larvae were captured, which were comprised of 45 yellowfin tuna, 9 albacore, 3 bigeye tuna and 1 bluefin tuna. The results showed that during spring and summer, tuna larvae did occur in the southeastern waters off Taiwan, which indicated a potential spawning ground for tuna. In the future, further analysis combining fishing ground information and studies on the recruitment dynamics in the Kuroshio could provide scientific backgrounds for the management.