Occurrence of Ayu Plecoglossus altivelis altivelis Larvae in the Hidaka Estuary

DOI JASI Web Site 2 Citations 19 References
  • YOSHIMOTO Yo
    Fisheries Experimental Station, Wakayama Prefectural Reserch Center of Agriculture, Forestry and Fisheries
  • FUJII Hisayuki
    Fisheries Experimental Station, Wakayama Prefectural Reserch Center of Agriculture, Forestry and Fisheries
  • NAKANISHI Hajimu
    Division of Fisheries Promotions of Wakayama Prefecture

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Other Title
  • 日高川河口域におけるアユ仔魚の出現
  • ヒダカガワ カコウイキ ニ オケル アユ シギョ ノ シュツゲン

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Abstract

The fluctuation of the number of ayu Plecoglossus altivelis altivelis larvae were investigated from 1992-1997 in different environmental condition at an observational station, 4 km upstream from the mouth of Hidaka River and the river estuary. The number of downswept ayu larvae was estimated as 2-24×108 per year. Larvae appeared from October - March, with a peak from November - December, in the center of the flow at the river mouth. The larvae in the centeral part of the flow were 6-8 mm in standard length. Approximately longer than 10 mm in standard length, they removed their habitat from the central part of the stream to the bank side as if to avoid being swept down by rapid stream. The number of collected ayu larvae and their standard length in the centeral part of the flow at the river mouth showed similar values both of the ebb and flow tide. Time lag of the number of ayu larvae at the river mouth appeared about 10 days later than the peak of downswept ayu larvae observed at the upstream station.

Journal

  • Aquaculture Science

    Aquaculture Science 54 (4), 543-551, 2006

    Japanese Society for Aquaculture Science

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