Isolation and Properties of a Bacterium Inhibiting the Growth of Gymnodinium nagasakiense

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  • Fukami Kimio
    Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University
  • Yuzawa Atsushi
    Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University
  • Nishijima Toshitaka
    Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University
  • Hata Yoshihiko
    Laboratory of Aquatic Environmental Science, Faculty of Agriculture, Kochi University Fukui Prefectural University

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Other Title
  • <i>Gymnodinium nagasakiense</i>の増殖を阻害する細菌の分離とその性状
  • Gymnodinium nagasakienseの増殖を阻害する細菌の分離とその性状〔英文〕
  • Gymnodinium nagasakiense ノ ゾウショク オ ソガイス

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Abstract

A bacterium 5N-3 possessing a remarkable inhibitory effect on the growth of Gymnodinium nagasakiense was isolated from Uranouchi Inlet, Kochi. This bacterium was tentatively identified as Flavobacterium sp. The growth inhibiting effect of 5N-3 on G. nagasakiense was drastic in particular when the alga was in the logarithmic growth phase, and cell density decreased to less than 1% of the initial concentration within 4 days after inoculating 5N-3, indicating that the effect was algicidal. The effect was obtained when the density of the bacterium was more than 106 cells/ml. However, they grew very rapidly up to 108 cells/ml by using extracellular released organic carbon from various phytoplankton species. On the other hand, the algicidal effect of 5N-3 was only observed on G. nagasakiense but not on Chattonella antiqua, Heterosigma akashiwo, or Skeletonema costatum. These results indicate that the effect of 5N-3 was G. nagasakiense-specific and suggest that it grows to a level of cell density effective in inhibiting the alga in the field by using naturally oc-curring organic carbon from phytoplankton.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 58 (6), 1073-1077, 1992

    The Japanese Society of Fisheries Science

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