沖縄南方海域におけるウナギのレプトセファルス幼生の採集について

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書誌事項

タイトル別名
  • Collection of Leptocephali of the Japanese Eel in Waters South of the Okinawa Islands
  • 沖繩南方海域におけるウナギのレプトセファルス幼生の採集について
  • オキナワ ナンポウ カイイキ ニ オケル ウナギ ノ レプトセファルス ヨウセ

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抄録

A total of 52 leptocephali of the Japanese eel, Anguilla japonica, was collected, with nets 4m in diameter at the mouth opening, in an area south of an Okinawa Islands south of 24°N and west of 130°E from 27th November to 5th December, 1973. Percentage of eels in total number of leptocephali at each station ranged from zero to 14.4%, but most fell between 2 to 5% except in the cases of zero occurrence. The average number of eels per towing was as high as 1.9 individuals at the maximum. The density of the eels tended to be high on the 22°N line. The area where the eels were distributed seemed to correspond well with the high water temperature area of 25°C or higher at the 100m depth layer. Most of the eels were obtained at mid-layer towings in the 10-70m depth layers, and from this it appears that the eels are distributed rather sparsely at the surface layer. Though all of the eels were collected after dark a clear trend of collection depending on the time of night was not observed. A rather uniform distribution of the eels is suggested.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 41 (2), 129-136, 1975

    公益社団法人 日本水産学会

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