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Viable counts were determined seasonally on the intestinal contents of 55 masu salmon (Oncorhynchus masou), 6 white-spotted char (Salvelinus leucomaenis), and 3 kokanee salmon (Oncorhynchus nerka) collected at two rivers and two lakes in the south of Hokkaido. The microflora of their ambient waters was also determined at the same time. About 1400 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) Viable microbial counts of the ambient waters were less than 1 to 10^3 per milliliter with observed seasonal variations, i.e. higher in summer, lower in winter. The microflora included the genera Flavobacterium/Cytophaga, Pseudomonas, Aeromonas, Achromobacter, and Enterobacteriaceae. 2) Viable microbial counts in the intestinal contents of the salmon ranged from 10^2 to 10^8 per gram, with observed seasonal variations, i.e. higher from spring to summer and lower in winter. 3) The intestinal microflora was comparatively simpler than of the ambient waters. The principal genera in the intestinal contents of the salmon were the Aeromonas and the Enterobacteriaceae.1. 河川および湖沼に棲息する23のサケ科魚類の腸内容物中の生菌数は10^210^8/gの範囲でかなりの個体差が認められたが全般的には春季から夏季において高く冬季に低い傾向が観察された。2. 腸内菌叢は周年を通じてみると全般的にはAeromonasが優勢で季節的には一般に春季から夏季にかけてAeromonas秋季にEnterobacteriaceae冬季にPseudomonasの占める割合が比較的高くなる傾向が認められた。3. 棲息環境水の生菌数は水温の変化に伴い夏季に高く冬季に低い傾向が認められた。4. 棲息環境水の菌叢は周年を通じて比較的高率に検出されるFlavobacterium/CytophagaおよびPseudomonasのほかAeromonasEnterobacteriaceaeAchromobacter等により構成され棲息魚の腸内菌叢とは明らかに異る様相を示した

Studies on the Intestinal Microflora of Salmonids. IV, The Intestinal Microflora of Fresh Water Salmon