シオミズツボワムシにおけるVibrio,Pseudomonas,およびMoraxella分離菌株の実験的動態

概要

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It is well-known that the rotifer Brachionus plicatilis cultured for mass seed production of various marine fishes contains bacterial flora which consists principally of Vibrio, Pseudomonas, and Moraxella at about 107-108 CFU/g. The rotifers, previously treated with penicillin G and streptomycin, were exposed to bacterial cell suspensions of 10 strains of Vibrio, Pseudomonas, and Moraxella isolated from rotifers. The concentration of each test bacteria rapidly reached 107-108 CFU/g in the rotifers exposed to 1.0×108 CFU/ml. But, by changing the seawater every h, the concentration of Pseudomonas, Moraxella, and an unidentified strain decreased from 1.2 ?? 7.1×107 CFU/g to 1.7 ?? 5.2×106 CFU/g after 4h. In additional experiments, it was shown that this decrease was caused mainly by inactivation of the rotifers. On the other hand, the concentration of Vibrio never decreased. It became apparent that Vibrio was different from other bacteria in its affinity or resistance to rotifers. It was considered that the relationship between rotifer and Vibrio was parasitism or commensalism, while that between rotifer and Moraxella-Pseudomonas seemed to be a predator-prey interaction.
日本水産學會の論文