Function of bacteria as vitamin B12 producers during mass culture of the rotifer Brachionus plicatilis.

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  • Yu Jian-Ping
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo
  • Hino Akinori
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo
  • Ushiro Masakazu
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo
  • Maeda Masachika
    Ocean Research Institute, The University of Tokyo

Bibliographic Information

Other Title
  • シオミズツボワムシ大量培養槽におけるビタミンB<sub>12</sub>収支およびB<sub>12</sub>産生菌の機能
  • シオミズツボワムシ大量培養槽におけるビタミンB12収支およびB12産生菌の機能〔英文〕
  • シオミズツボワムシ タイリョウ バイヨウソウ ニ オケル ビタミン B12 シ

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Abstract

The balance of vitamin B12 in massculture of the rotifer Brachionus plicatilis was calculated for both batch and semicontinuous cultures after the evaluation of B12 concentrations in Nan-nochloropsis, yeast, rotifer and culture water. The B12 output, which is taken as the total of B12 harvested and left remaining in a tank, was 1.6-2.2 times larger than the B12 introduced with food, water and inoculum. On the other hand, among 100 bacterial strains isolated from rotifer tanks, 35 had B12 productivity and 19 of them promoted the growth of the rotifer effectively when supplied with yeast. Calculated from the feeding rate, the B12 content of bacteria and the B12 demand of the rotifer, it is proved that the greater part of B12, the essential vitamin to the rotifer is produced by bacteria existing in water, and excess amount was transferred to the rotifer automatically by grazing.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 55 (10), 1799-1806, 1989

    The Japanese Society of Fisheries Science

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