Studies on early life history of Anguilla japonica in 1986 survey cruise by R.V. Hakuho Maru - I. Distribution of Anguilla japonica leptocephali in Western Pacific during September 1986.

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  • Kajihara Takeshi
    Ocean Research Institute, University of Tokyo Environmental Biology Research Center Co. Ltd.

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  • 西部北太平洋におけるウナギ葉形仔魚の分布
  • 西部北太平洋におけるウナギ葉形仔魚の分布〔英文〕
  • セイブ キタ タイヘイヨウ ニ オケル ウナギ ヨウケイ シギョ ノ ブンプ
  • Distribution of Anguilla japonica leptocephali in western pacific during september 1986

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Abstract

A survey cruise was conducted in the Western Pacific between August 26 and October 2, 1986 to determine the horizontal distribution of Anguilla japonica leptocephali.<br> A total of 21 A. japonica leptocephali were collected mainly by 3m IKMT with 0.5mm mesh at night. During grid survey in the former leg, standardized IKMT oblique tows (130 min towing from the surface to 500m deep) showed that only 3 of the 35 stations were positive for A. japonica leptocephali: 2 specimens at Station 7 (lat. 18°56' N, long. 129deg;34' E), 3 specimens at Station 10 (lat. 15deg;56' N, long. 129deg;37' E) and 1 specimen at Station 31 (lat. 22deg;02' N, long. 122deg;25' E). Most of leptocephali (18 specimens) occurred in the more southeastern area (lat. 15deg;56' -19deg;03' N and long. 129deg;11' -37' E) than those reported in the previous studies. The direction of water flow in this area was mainly southwest.<br> The size of specimens was roughly uniform and the mean (SD) was 43.1mm (2.8), which was ca. 10mm smaller than that of specimens ever collected. The minimum record of this species (33.9mm TL) occurred at Station 10.

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