マコンブ種苗糸赤変原因菌Alteromonas sp.の噴火湾沿岸における分布〔英文〕

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Distribution of the Alteromonas sp., the causative agent of red-spots on the culture bed of makonbu sporophytes in the culture tanks, was estimated at sites of makonbu cultivation in Funka Bay, Hokkaido. This marine bacterium began to appear late in June to early in July when water temperature rose above 13°C, and during the next month appeared in high frequency in this area. But the rate of detection became low when temperature decreased, and the organism could not be detected from winter to spring. It is obvious that the frequency of occurrence of the organism in this area changes during the year. Attempts were also made to evaluate the route of invasion of this organism into the algal culture tank. The organism was detected from mature fronds and zoospores of makonbu used for cultivation in the nursery. Additionally, the organism, a marine bacterium, requires salts for growth and is labile in heat and dryness. These results suggest that the invasion route of the organism into the algal culture was through mature fronds of makonbu growing in coastal areas contaminated with this organism.