Relationship between distribution of larvae and juveniles of ayu Plecoglossus altivelis altivelis in the sea around Yahagi Estuary (western part of Mikawa Bay), and sediment quality

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  • 矢作川河口周辺海域(三河湾西部)におけるアユ仔稚魚の分布と底質との関係
  • ヤハギガワ カコウ シュウヘン カイイキ ミカワワン セイブ ニ オケル アユ シチギョ ノ ブンプ ト テイシツ トノ カンケイ

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Abstract

  The horizontal distribution of larval and juvenile ayu Plecoglossus altivelis altivelis, and its relation to the amounts of organic matter in sediments, were investigated in the sea around the Yahagi Estuary within 4 km from the rivermouth in their two reproductive seasons (1st: November 2002-February 2003, 2nd: November 2003-March 2004). Ayu were collected with aqua lamps within 1 km area from the coast, and also east of the rivermouth in both years except late February to early March when ayu annually start to ascend the river. Significant negative correlations were found between the distribution of ayu and the amounts of organic matter in the sediments; the larvae and juveniles being collected above the bottoms with less than 1% ignition losses and less than 6 mg g-1 total organic carbon content.<br>

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