和歌山県中部の砕波帯におけるアユ仔魚の分布  [in Japanese] Distribution of Ayu, Plecoglossus altivelis Larvae in Surf Zones in the Central Area of Wakayama Prefecture, Japan  [in Japanese]

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Abstract

和歌山県中部の砕波帯15地点においてアユ仔魚を採集し, 仔魚の採集量, サイズおよび日齢から当海域の砕波帯におけるアユの分布パターンを検討した。アユ仔魚の孵化期間は, 10月上旬から1月上旬の約3ヶ月間であり, このうち11月生まれが主体を占めた。孵化月別に分布パターンをみると, 10月および11月生まれの個体は, 主要河川の河口周辺のみならず, 河口から岸沿いに15-20km離れた地点でも多く採集されたのに対して, 12月生まれの個体は河口周辺に留まってほとんど広がらない傾向を示した。アユの分布パターンと孵化期間中の降水量の推移から, 河川流量の多い10-11月に孵化した個体は,<BR>河川流量の少ない12月に孵化した個体に比べて分散距離が大きい傾向が認められた。以上から, 海域におけるアユの分散距離は孵化期間中の河川流量に影響を受けることが示唆された。

The abundance, size, and age of ayu <I>Plecoglossus altivelis</I> larvae were investigated to clarify the distribution pattern, using samples collected from 15 sites in surf zones in the central area of Wakayama Prefecture. The hatching date of ayu ranged from early October to early January, and was mainly between October and December with a peak in November. The fish hatched from October to November were widely distributed in the survey area as far as 15-20km from the mouth of the principal rivers, whereas those hatched in December stayed near the river mouth. The relationship between the distribution pattern of ayu and the daily precipitation during the downstream migration showed that the distance of transportation of ayu larvae from the river mouth is longer in the specimens hatched in October-November (wet months) than in those hatched in December (dry month) . These facts suggest that the transportation of ayu would be affected by the river discharge at the time of the downstream migration of the newly hatched larvae to the sea.

Journal

  • Aquaculture Science

    Aquaculture Science 50(1), 9-15, 2002-03-25

    Japanese Society for Aquaculture Science

References:  25

Cited by:  7

Codes

  • NII Article ID (NAID)
    10008020099
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03714217
  • NDL Article ID
    6115826
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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