三河湾におけるアサリ稚貝の分布量と底質およぴ流れとの関係  [in Japanese] The Relationship between the Abundance of Juvenile Japanese Littleneck Ruditapes philippinarum and the Bottom Condition and Water Movement in Mikawa-Bay  [in Japanese]

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Abstract

全国のアサリ漁獲量は1984年以降減少する傾向を示しており、資源量を維持するために種苗の移植放流が行われている。近年、愛知県産の移植用種苗の供給量が全国で最も多く、県内外の育成場へ移植されている。三河湾の矢作川河口から矢作古川河口にかけた水域もアサリ稚貝分布量が多く、県内でも種苗の供給地として最も重要な場所である。著者らは西三河地区における稚貝漁場の形成要因を明らかにするため、稚貝の分布量と浮遊幼生の移動に関係する流れおよび着底後の生き残りに関する底質との関係を現地調査や流況シミュレーションにより調査・解析した。

The relationship between distribution of juvenile japanese littleneck Ruditapes phillippinarum and physicalenvironment, especially bottom condition and water current, was investigated in west Mikawa-bay. Sedimentsamples were collected by Smith-McIntyre grab. These samples were sieved with lmm mesh screen and bivalveswere picked up and measured shell length. The oxydised layer and the reduced layer of substratum were observedthroughout the transparent corer, and then upper 10 cm of cored sediments were used for particle size analysis.The water current-of the bay was analyzed by the three dimensional hydrodynamic model. The juveniles alwaysdistributed more abundantly in the mouth of Yahagi river than in other stations. The thickness of oxidized layerin bottom sediment was more than 20 cm in the river mouth, whereas most of other station showed less than 10 cm.The landward water current in bottom and lower strata of the river was observed according to the numerical analysis.Thus, it was considered that the bottom condition and the water movement contributed to the survival ofjuveniles and the entrainment of planktonic larvae to the habitat, respectively.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 32(2), 137-143, 1995-11-30

    The Japanese Society of Fisheries Engineering

References:  10

Cited by:  6

Codes

  • NII Article ID (NAID)
    10008438673
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09167617
  • Data Source
    CJP  CJPref  J-STAGE  JASI 
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