大阪湾におけるイカナゴAmmodytes personatus仔魚の鉛直分布と 摂餌に対する水中照度の影響  [in Japanese] The Influence of Light Intensity on the Vertical Distribution and Feeding of Japanese Sand Lance Ammodytes personatus Larvae in Osaka Bay  [in Japanese]

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Author(s)

Abstract

大阪湾において, イカナゴ仔魚の日中の鉛直分布を調査したところ, 5m層を極大として, 10m以浅の水深に集中的に分布していた。また, 浅い層の仔魚ほど多く摂餌していた。しかし水温, 塩分, および主餌料であるカイアシ類幼生の鉛直分布からは, これらの事象を説明できなかった。一方, 飼育実験の結果, 平均全長6.8mmのイカナゴ仔魚のワムシ摂餌数は明るいほど多く, 特に10lxと(10)<SUP>2</SUP>lxの間で約3倍の差があった。現場海域で水中照度が(10)<SUP>2</SUP>lxを下回る水深は15&acd;20mであったことから, イカナゴ仔魚が日中この水深帯に分布するのは, 摂餌に適した明るさを得るためであろうと考えられた。

The vertical distribution and feeding of Japanese sand lance Ammodytes personatus larvae were examined based on the data obtained by 5 times of MTD depth-discrete net tows in Osaka Bay during daytime in January 1991, January and February 1992, and January 1993. Vertical distributions of light intensity, temperature, salinity, and copepods abundance were also measured. Sand lance larvae were abundant in 1-10m depth (especially at 5m depth), while the vertical profiles of temperature and salinity were not stratified. The value of fullness of gut of larvae (F. G.) declined with increasing depth, whereas the vertical distribution of copepods was not consistent with F. G. The data from laboratory experiments demonstrated that light intensity lower than (10)<SUP>2</SUP>lx is insufficient for feeding of sand lance larvae (14 days after hatching, mean T. L.=6.8mm) on rotifers. In the field, light intensity lower than (10)<SUP>2</SUP>lx occurred at 15-20m depth. These facts suggest that the distribution depth of sand lance larvae during daytime is strongly related to light intensity necessary for feeding.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 66(4), 713-718, 2000-07-15

    The Japanese Society of Fisheries Science

References:  25

Cited by:  2

Codes

  • NII Article ID (NAID)
    110003145078
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00215392
  • NDL Article ID
    5468180
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-345
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE  NDL-Digital 
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