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

鬼頭刀 (Coryphaena hippurus) 為臺灣東部重要經濟魚種，本研究利用胃內含物分析探討其食性。自2012年10月至2013年12月，按月於臺東新港漁市場採集鬼頭刀胃內含物樣本 (n=375) (樣本尾叉長範圍為 47.3 ~ 142 cm，體重範圍為 1 ~ 23 kg)，進行胃內含物分析。餌料生物之相對重要性指數 (relative importance index, IRI) 顯示，以玉筋魚 (Ammodytidae sp.) 的 IRI 255.53為最高，其次為飛魚 (Cheilopogon sp.) 的231.99、眼眶魚 (Mene maculata) 的192.70與頭足類柔魚科(Ommastrephidae) 的166.76，其他頭足類也為常見的物種。這些結果顯示，鬼頭刀為機會攝食者，在臺灣東部海域主要攝食幾種常見的大洋性魚類。此外，雌雄魚間的食性並無顯著差異，但鬼頭刀成長至尾叉長 60 cm 以上，胃內含物組成有明顯變化且季節間具有顯著差異。

The dolphinfish (Coryphaena hippurus) is an economically important fish species in eastern Taiwan. This study examined the feeding habits of dolphinfish using stomach content analysis. Dolphinfish samples were collected monthly at Shinkang fishing port from October 2012 to December 2013 and 375 samples (47.3-142 cm fork length; 1-23 kg) were analyzed. Based on the index of relative importance (IRI), the most important prey species were sand lances (Ammodytidae sp.; IRI=255.53), followed by the flyingfish (Cheilopogons sp.; IRI=231.99), the moonfish (Mene maculata; IRI=192.7), and Ommastrephidae (IRI=166.7). Other cephalopods were also found in moderate abundance. These results indicated that dolphinfish are an opportunistic predator, feeding predominantly on a few species of pelagic fishes in waters off eastern Taiwan. The feeding habits of the dolphinfish did not differ significantly between sexes. However, stomach content composition changed significantly in dolphinfish >60 cm fork length and among seasons.