風の日々変動がマガレイ卵・仔魚の沿岸海域への滞留に及ぼす影響に関する数値シミュレーション  [in Japanese] Numerical Simulation of the Effect of Daily Wind Variation on the Retention of Brown Sole Eggs and Larvae in the Coastal Nursery Sea  [in Japanese]

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Abstract

日本海の佐渡海峡沿岸の陸棚海域は、マガレイの主産卵場の一つとなっている。この海域には、北ないし北東向きの沿岸流が卓越しており、浮遊期のマガレイ卵・仔魚はこの流れによって新潟沖の産卵場から北方に輸送され、成育場(着底場)に到達する。この海域の流れの数値モデルを用いたマガレイ卵・仔魚の輸送過程に関する検討結果から、上述の沿岸流に加えて産卵時期(盛期は3月)の風および卵・仔魚の鉛直移動が、それらの輸送や浅海域への滞留状況に大きな影響を与えている可能性が指摘されており、藤原らは、現地観測から推定された卵・仔魚の鉛直移動特性を考慮した場合にのみ、産卵場から成育場までの輸送が良好に再現されることを示した。成育場は新潟市北東の陸棚上浅海域(水深100m以浅)と推定されており、陸棚から沖合に運ばれることなく着底前にこの成育場に到達することが、資源加入の必要条件の一つと考えられる。

Transport of blown sole (Pleuronectes herzensteini) eggs and larvae from the spawning ground near SadoStrait, Sea of Japan is simulated using a numerical model to evaluate the effect of daily wind variation on thelarval retention rate, which indicates the percentage of eggs and larvae retained in the shelf area shallower than100m. Observed winds in March (main spawning period) of three years (1983, 1984 and 1996) and a currentprofile observed by ADCP at the entrance of Sado Strait are used as driving forces. The vertical movement ofeggs and larvae estimated from field observations is also considered in the model. One hundred eggs are producedevery 5 days and tracked for the planktonic period (30 days) using a drifter advection/dispersion model based onthe water circulation calculated by a three-dimensional hydrodynamical model.In 4 cases out of 21, the retention rates are over 30%. They have a similar wind condition that weak windcontinues for several days after spawning. Therefore short-term wind fluctuation could have a great effect on theretention rate. From the simulation results under the modeled wind condition, it is revealed that the strong windblow during 9- 14 days after spawning increases the retention rate, while that during the other days decreases it.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 35(2), 93-99, 1998-12-01

    The Japanese Society of Fisheries Engineering

References:  8

Codes

  • NII Article ID (NAID)
    10008274837
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09167617
  • NDL Article ID
    971211
  • 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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