台風が諫早湾小長井町地先の造成アサリ漁場に及ぼした影響

DOI 日本農学文献記事索引 Web Site 参考文献17件

書誌事項

タイトル別名
  • Effects of Typhoons on Artificially-made Culture Grounds for the Manila Clam <I>Ruditapes philippinarum</I> along Konagai Coast of Isahaya Bay, Kyushu, Japan
  • タイフウ ガ イサハヤワン コナガイマチジサキ ノ ゾウセイ アサリ ギョジョウ ニ オヨボシタ エイキョウ

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抄録

The artificially-made fishery grounds for Manila clam on the northern coast of Isahaya Bay, western Kyushu, were disturbed by two typhoons, each having passed over Nagasaki Prefecture in September of 2005 and 2006, respectively. This study described the changes in the clam populations and substrate conditions within 2 weeks on two (in 2005) and three (in 2006) grounds and in the clam population over three years on one representative ground. In 2005, significant reductions in clam density were recorded for smaller juveniles (2.0-4.9 mm in shell length; two grounds) and larger juveniles (5.0-14.9 mm; one ground). In 2006, such reductions were observed for smaller juveniles (three grounds), and larger juveniles and smaller adults (15.0-24.9 mm) (one ground). Larger adults (≥25.0 mm) were not significantly affected. The variation in the density-reduction patterns among years and sites was ascribed to the direction of the fishery grounds against the prevailing typhoon-induced waves. In the long term, the total clam density fell to 1/3 immediately after the 2006 typhoon, and remained at a low level until July, 2008. Of the substrate conditions, sediment sulfur content and ignition loss tended to be reduced in the short term.

収録刊行物

  • 水産増殖

    水産増殖 59 (1), 75-88, 2011

    日本水産増殖学会

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