サケ科魚類の腸内細菌叢に関する研究-I : 飼育魚の腸内細菌数と細菌叢

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Viable counts were determined seasonally on the intestinal contents of 22 masu salmon (Oncorhynchus masou) and 10 king salmon (Oncorhynchus tschawytscha) reared in fresh water and sea water, and on these ambient waters. Two kinds of media, fresh- and sea-water based media, were put in parallel. Over 1600 strains were isolated from the above samples. The composition of the microflora was determined according to the scheme of SHEWAN et. al. (1960). The results are summarized as follows: 1) The number of viable bacteria in both fresh and sea breeding waters was about 10^3 per milliliter with no observed seasonal variation. The composition of the microflora mainly included the genera Flavobacterium/Cytophaga, Achromobacter and Pseudomonas. 2) The number of viable bacteria in the intestinal contents of salmon ranged from 10^4 to 10^7 per gram. The intestinal microflora was comparatively simpler than that of the ambient water, and the floras of fresh- and sea-water reared salmon were quite different. The principal genera in the intestinal contents of fresh water reared salmon was genus Aeromonas and the family Enterobacteriaceae, while that of sea water reared salmon consisted mainly of the genus Vibrio.1. 森ふ化場（淡水）および忍路湾飼育場（海水）の飼育環境水の生菌数は約10^3/ml程度で，年間を通じて観察した前者における結果では季節的変動が認められず，周年ほぼ一定であつた。2. 飼育魚の腸内容物中の生菌数は10^3～10^7/gの範囲でかなりの個体差が認められ，季節的にも特定の傾向は認められなかつた。3. 飼育環境水の細菌叢としては，淡水，湾内海水共にgenus Flavobacterium/Cytophaga，Achromobacter，Pseudomonasがその主体を占めた。4. 飼育魚の腸内容物の細菌叢は飼育環境水のそれに比較し，その構成は単純で，特に淡水飼育魚ではgenus Aeromonas，family Enterobacteriaceae，海水飼育魚ではgenus Vibrioがその主体をなすことが知られた。
日本水産学会 = The Japanese Society of Scientific Fisheriesの論文

サケ科魚類の腸内細菌叢に関する研究-I : 飼育魚の腸内細菌数と細菌叢

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