An experimental study of the roles of Pronodularia japanensis and Corbicula spp. as hosts of Tanakia tanago in the Handa Miyakotanago (Tanakia tanago) protection area

  • Fukumoto Kazuhiko
    Plankton Laboratory, Department of Ocean Sciences, Tokyo University of Marine Science and Technology
  • Suguro Naoyuki
    Kanagawa Prefectural Fisheries Experimental Station
  • Maruyama Takashi
    Plankton Laboratory, Department of Ocean Sciences, Tokyo University of Marine Science and Technology

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Other Title
  • 羽田ミヤコタナゴ生息地保護区に生息するマツカサガイPronodularia japanensis及びシジミ属Corbicula spp.の産卵母貝適性実験
  • ハンダ ミヤコタナゴ セイソクチ ホゴク ニ セイソクスル マツカサガイ Pronodularia japanensis オヨビ シジミゾク Corbicula spp ノ サンラン ボガイ テキセイ ジッケン

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Abstract

The roles of Pronodularia japanensis and Corbicula spp. were studied experimentally to examine the cause of the decrease in Tanakia tanago in the Handa Miyakotanago protection area, Ootawara City, Tochigi Prefecture, central Japan. Tanakia tanago showed a clear preference for Pronodularia japanensis, while it rarely used Corbicula spp. as a host. Embryos were found at greater frequencies in the gills of Pronodularia japanensis collected from the Kuji River than in those collected from a small creek at Handa. The survival rate of embryos was also lower in the latter. These results suggest that the poor condition of mussels, due to water pollution in the Handa Miyakotanago protection area, was the reason for the decline in the population of Tanakia tanago in the late 1990s.

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