中間育成池における流動・水質 Flow and Water Quality in a Nursery Aquaculture Pond

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Abstract

波浪エネルギーを利用して海水交換を行うために砂浜に造成されたヒラメ稚魚の中間育成池において,流動と水質の変動特性を明らかにする唱的で現地観測を行った。測定項目は流速,水温,塩分,溶存酸素(DO)で,さらに流動パターンを把握するため染料拡散実験を実施した。海水流入量は海水位と波高によって変動し,海水取入口から流入した海水は池内において循環流を形成して流出口に向かう。それゆえに水温とDOが最大値を示す時刻は場所によって異なることになる。DOに関しては海水取入口が閉じている状態では朝の6時に最低値の飽和度60%まで減少する。またDO収支から推定すると,池内におけるすべての消費過程を考慮したDO消費速度は0.162mg/l/hrとなった。そのうちの60%は水中懸濁物, 20%はヒラメの呼吸によるもので,残りは底質による消費であった。塩分収支から推定した海岸地下水流入量は海水流入量と比較すると無視できる程度であった。

A field study was carried out to make clear the pattems of flow and water quality changing in a nurseryaquaculture pond (30mx 40mxlm) for juvenile flounders, Paralichthys olivaceus, constructed on a sandybeach to utilize wave energy for water exchange. Current velocity, water temperature, salinity, and dissolvedoxygen (DO) were measured and a dye diffusion experiment to visualize the flow pattem was conducted.The inflow rate varied according to the sea level and wave height, and the sea water coming from the inletto the outlet generally created a recirculating flow pattem in the pond. Therefore,.the time, when the maximumvalues of water temperature and DO concentration occurred, varies with respect to the location in the pond.The DO concentration fell to 60% saturation as a minimum at around 6 a.m., when the inlets were closed.estimated from the DO budget, it was found that the DO consumption rate by all processes in the pond wascalculated at 0.162mg/l/hr. About 60% of the consumption was due to the organisms and chemicals which weresuspended in the water, about 20% was due to the flounders, and the rest 20% was due to the sediment.The inflow rate of groundwater was relatively small when compared with that of sea water, judging from thesalinity budget in the pond.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 34(2), 185-194, 1997-12-12

    The Japanese Society of Fisheries Engineering

References:  14

Codes

  • NII Article ID (NAID)
    10008274603
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    ENG
  • Article Type
    NOT
  • ISSN
    09167617
  • NDL Article ID
    4381856
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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