Studies on the Flying-fishes in the North Arabian Sea

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  • 北部アラビア海に出現するトビウオ類の形態学的研究
  • ホクブ アラビアカイ ニ シュツゲンスル トビウオルイ ノ ケイタイガクテキ

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Abstract

A pelagic fish assessment survey has been made by R/V Shoyo maru from October 2, 1975 to January 14, 1976 in the north Arabian Sea. In the course of the cruise, 9 species of flying-fishes belong to the family Oxyporhamphidae and Exocoetidae were collected (Table 1). Their morphological features are mentioned here. Oxyporhamphus meristocystis and Cheilopogon intermedius described by flapmr (1961a, 6) were included in this collection. The number of gill-rakers in O. meristocystis is 29-33 (27-31 : IZapxH, 1961 6), the number of transverse scales in Ch. intermedius is 81 (7-721: IIaprzx, 1961 a) . Prognichtys sealei and P. brevipinnis are distinguished each other by the counts of unbranched pectoral fin rays, the former are four unbranched rays, the latter three. Hirundichthys coromandelensis has the fewer vertebrae (42-44) than that of closely related species H. speculiger and H. oxycephalus, i. e. H. speculiger: 45-46, H. oxycephalus: 45-47 (Imai, 1960).

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