伊豆大島におけるマクサのスポアバッグの投入時期の検討  [in Japanese] Examination of the Optimal Season to Set Spore Bags for Gelidium elegans (Rhodophyta) in Izu-Oshima Island, Central Japan  [in Japanese]

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Author(s)

    • 高瀬 智洋 TAKASE Tomohiro
    • 東京都島しょ農林水産総合センター大島事業所 Oshima Branch, Tokyo Metropolitan Islands Area Research and Development Center of Agriculture, Forestry and Fisheries
    • 滝尾 健二 TAKIO Kenji
    • 東京都島しょ農林水産総合センター大島事業所 Oshima Branch, Tokyo Metropolitan Islands Area Research and Development Center of Agriculture, Forestry and Fisheries
    • 木本 巧 [他] KIMOTO Takumi
    • 東京都島しょ農林水産総合センター大島事業所 Oshima Branch, Tokyo Metropolitan Islands Area Research and Development Center of Agriculture, Forestry and Fisheries
    • 山口 邦久 YAMAGUCHI Kunihisa
    • 東京都島しょ農林水産総合センター大島事業所 Oshima Branch, Tokyo Metropolitan Islands Area Research and Development Center of Agriculture, Forestry and Fisheries

Abstract

1)伊豆大島沿岸の2地点(波浮港,泉浜)で,1年3カ月にわたり,毎月1回,マクサのスポアバッグを投入し,胞子の着生,幼体の生育,水温観測および期間限定で堆積物の調査を行った。<BR>2)対照区との比較から,採苗器に着生したテングサ科胞子は,概ねスポアバッグ由来のマクサ胞子であることが示され,スポアバッグからの胞子放出を確認した。また,両試験地ともに,7~10月に,採苗器に多くのテングサ科胞子の着生が確認されたことから,この時期がスポアバッグの投入に適していると考えられた。<BR>3)スポアバッグを固定した土台コンクリートブロックに,両試験地ともに,マクサ幼体の着生が認められた。ただし,波浮港では,マクサはその後も良好に生長し,成熟も認められたが,泉浜では減耗した。泉浜において,幼体の減耗した時期に,堆積物の日堆積量の増加および中央粒径値の増大が観察された。

To examine the optimal season to set spore bags for <I>Gelidium elegans</I>, a test of spore release by using the spore bag method was conducted at two sites at Izu-Oshima Island. Two at each site, four net bags, in which mature <I>G. elegans</I> were placed and each with a float were set every month from October 2009 to December 2010. In addition, four net bags, without mature <I>G. elegans</I>, were set every month as a control at one site. The mean density of <I>Gelidium</I> spores that attached on spore collectors (glass slides) was significantly greater in the spore bags than that in the control, and increased from July to October at both sites. From these, we concluded that the period was the optimal season to set spore bags for <I>G. elegans</I>. The thalli of <I>G. elegans</I> were observed on the concrete blocks to which spore bags were tied at both sites. However, at one site, the thalli of <I>G. elegans</I> did not grow. We compared the environmental conditions of the two sites, there was a significant difference in the amount of sedimentation. It is thought that sedimentation is an important environmental factor in the growth of <I>G. elegans</I>.

Journal

  • Aquaculture Science

    Aquaculture Science 60(2), 179-187, 2012-06-20

    Japanese Society for Aquaculture Science

References:  33

Codes

  • NII Article ID (NAID)
    10031122346
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03714217
  • NDL Article ID
    023860625
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  NDL  IR  J-STAGE 
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