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Stomach Contents of Dolphins (Delphinus delphis and Lissodelphis borealis) from North Pacific Ocean
北太平洋兩種海豚之胃含物研究
Abstracts
1991年5月至8月及1992年9月至11月間，北太平洋臺灣流刺網漁船蒐集到九隻意外死亡海豚。其胃內含物經稱重、歸類、計數並鑑定至最低可能之分類類別。除一隻真海豚（Delphinus delphis）胃中僅有乳汁外，其它六隻真海豚及兩隻北露脊海豚（Lissodephis borealis）的胃含物中，魚類為主要成份，各佔94%及89 %，其中又以燈籠魚類（Myctophid）最多也最常見，數量上各佔魚類的95%及89%。在胃含物中共發現，12科33種魚類，以角燈魚、（Ceratoscopelas warmingi） 及珍燈魚（Lampanyctus jordani）為優勢種。魷魚類在這些海豚胃含物中所佔比例較低（＜11%），共發現8科13種，以貓多鉤螢火魷（Abraliposis felis）及日本爪魷（Onychoteuthis borealijaponica）為優勢種。
Parallel abstracts
Nine dolphins (two Lissodelphis borealis and seven Delphinus delphis), killed incidentally by the driftnet fishery in the North Pacific Ocean, were collected during the periods from May to August 1991 and from September to November 1992. Stomach contents of each animal were weighed, sorted, examined, and counted. Prey species were identified to the lowest possible taxon. One stomach of D. delphis contained only a milky substance. In the other six of D. delphis and the two stomachs of L. borealis, fish otoliths numerically comprised 94% and 89% of the diet contents, respectively. Myctophid fish were the most abundant and commonly occurring fish group and numerically comprised 89% (L. borealis) and 95% (D. delphis) of all fish prey found. Among thirty-three fish prey species belonging to twelve families, Ceratoscopelas warmingi and Lampanyctus jordani were the most common and abundant species. Squid comprised proportionately less « 11%) of these dolphins' diet. Among thirteen species belonging eight families, the most common and dominant squid species were Abraliopsis felis and Onychoteuthis borealijaponica.