著者
一丸 俊雄 水田 浩二 中園 明信 TOSHIO ICHIMARU KOJI MIZUTA AKINOBU NAKAZONO 長崎県総合水産試験場 長崎県総合水産試験場:(現)長崎県五島支庁水産課 九州大学大学院農学研究院 Nagasaki Prefectural Institute of Fisheries Nagasaki Prefectural Institute of Fisheries:Fisheries Division of Goto Branch Office of Nagasaki Prefectural Government Faculty of Agriculture Kyushu University
出版者
日本水産學會
雑誌
日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)
巻号頁・発行日
vol.72, no.1, pp.21-26, 2006-01-15
参考文献数
11
被引用文献数
7

1998~2004年の4~8月に長崎県五島列島沖および鹿児島県屋久島沖で採集したホソアオトビHirundichthys oxycephalusの卵を顕微鏡下で観察した。本種の卵は片側に直径20μmの纏絡糸が1本と10μmの纏絡糸が5~7本,その反対側に6μmの纏絡糸を9~14本有しており,H. coromandelensisの卵に似た形状をしている。纏絡糸の径はH. coromandelensisよりホソアオトビの方が細く,これによって2種を区別することが可能と考えられた。卵の出現は鹿児島県では5~7月,長崎県では7~8月であり,水温により産卵期は異なるものと考えられた。Eggs of the mirror-finned flying fish Hirundichthys oxycephalus were collected from the drifts near Goto Islands and Yaku Island, from April to August within the years of 1998 to 2004. To identify species, the eggs were reared and the hatched larvae were observed. The eggs were 1.6-2.0mm in diameter. Three types of filaments were recognized. One was a single filament of 20μm, the others were 5-7 filaments of 10μm, and 9-14 filaments of 6μm. The number of filaments observed in H. oxycephalus was similar to that formerly reported in H. coromandelensis, however, the thinner diameter of H. oxycephalus filaments than that of H. coromandelensis makes it possible to distinguish between the two species. The eggs were collected in Kagoshima from May to July, and in Nagasaki from July to August, and this difference seems to be due to the difference of water temperature between the two localities.