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Basic experiments were carried out preliminarily to determine the usefulness of a double-tubular U.V.-water treatment unit (Seibu Kagaku Co., Model Cs-50 U) for the disinfection of hatchery water. The results obtained are summarized as follows. 1. The disinfectant effect of U.V. was examined on cell suspensions (10^[5~7] cells/ml) of 5 species of fish pathogen and one strain of Escherichia coli. A 99.99%or more reduction of their viable cells was effected by U.V. treatment of less than 8.5 l/min. flow rate that is equivalent to more than 22,100 μW・sec/cm2 U.V. dosages. 2. The experiments on 4 specimens of fish-rearing pond waters containing 10^[4~6] viable cells/ml indicated that U.V. radiation is an effective means of destroying microorganisms in the hatchery water supply. However, a tendency towards U.V. resistance was shown by some groups of water microflora, e.g. Coryneforms, or yeastlike organisms.2重管式紫外線流水殺菌装置西武化学・CS-50-U型に2台の渦流ポンプ流量計などを組合せ流水量を最大14l/minまで可変な装置を用い養魚用水の殺菌についての基礎的実験を行ない次のような結果を得た。1. Aeromonas salmonicidaなど5種の魚病原因菌ならびに対照のEscherichia coilの10^[57]cells/ml懸濁液を用いた実験では流量8.5l/minまたはそれ以下紫外線照射量約22,100μW・sec/cm2以上の場合いずれの供試菌においても99.99%以上の殺菌効果が認められた。2. 生菌数10^[46]/mlを含む養魚池の水を用いた実験でも同様にきわめて良好な殺菌効果が認められたが試水菌叢中CoryneformsやYeastなど一部のものに若干紫外線に対する感受性の低い傾向が認められた

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Disinfection of Hatchery Water Supply by Ultraviolet (U.V.) Irradiation. I, Susceptibility of Some Fish-Pathogenic Bacterium and Microorganisms Inhabiting Pond Waters