热带西太平洋帆蜥鱼胃含物组成分析

Composition of stomach contents of longnose lancetfish(Alepisaurus ferox) in western tropical Pacific Ocean

根据中国金枪鱼延绳钓渔业观察员于2017年9月至2018年1月在热带西太平洋(165°45′E～178°00′W,03°02′S～18°34′S)采集的138尾帆蜥鱼(Alepisaurus ferox)样本,对其胃含物组成进行了研究。结果显示,帆蜥鱼胃含物中共鉴定出61种(类)生物,分属鱼类、软体动物、甲壳类、多毛类、刺胞动物和海樽类等6大类44科。此外,还观察到了同类相食现象以及塑料垃圾。胃含物的Shannon-Wiener多样性指数(H')为2.71,Pielou均匀度指数(J')为0.67,饵料优势指数(D)为0.12。相对重要性指数(IRI)分析结果显示软体动物为帆蜥鱼的主要食物,其IRI为7 573.31,占IRI总和百分比(IRI%)为53.11%。在科一级水平上,褶胸鱼科、帆蜥鱼科、龙骨螺科、翼管螺科、单盘蛸科、爪乌贼科、刺虾科、宽腿鰯科、Eurytheneidae和浮沙蚕科为其优势饵料。

We investigated the composition of the stomach contents of 138 longnose lancetfish ( Alepisaurus ferox ) collected from September 2017 to January 2018 by the Chinese Longline Fisheries Observer Programme in the western tropical Pacific Ocean (165°45′E-178°00′W, 03°02′S-18°34′S). A total of 61 species from 44 families, belonging to six prey groups (Fish, Mollusca, Crus-tacea, Polychaeta, Cnidaria and Thaliacea) were identified. Cannibalism and plastic debris ingestion were also observed. The obtained values of Shannon-Wiener diversity index ( H'), Pielou evenness index ( J') and dominance index ( D ) of A. ferox 's diet composition were 2.71, 0.67 and 0.12, respectively. The result of index of relative importance (IRI) analysis indicates that Mollusca was the dominant prey with IRI of 7573.31 which accounted for 53.11% of total IRI. At family level, Sternoptychidae, Alepisauridae, Carin-ariidae, Pterotracheidae, Bolitaenidae, Onychoteuthidae, Oplophoridae, Platyscelidae, Eurytheneidae and Alciopidae were the most important preys of A. ferox.