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A total of 92 masu salmon (Oncorhynchus masou) which had developed silvering were divided into 4 groups. Three of these groups were transplanted from fresh water. The feeding conditions varied with the group. Viable counts were determined in the intestinal contents or slime of these salmon, in their ambient waters and in their diets. Over 1500 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) Microbial viable counts in the intestinal contents or slime of the fish which were transplanted under normal feeding conditions were nearly constant while those which were transplanted without being fed decreased rapidly. This decreasing tendency was found in both fresh and sea water reared non-feeding fish. 2) The predominant genus in the intestinal microflora of the fresh water fish was Aeromonas, while in sea water fish it was Vibrio. Upon transplanting the fish from fresh water into sea water fish it was Vibrio. Upon transplanting the fish from fresh water into sea water, Aeromonas of the terrestrial type was gradually replaced by Pseudomonas as the proportion of sea water in the rearing water increased. This was followed by further replacement by Vibrio of the halophilic type which became predominant in the intestinal microflora.淡水飼育中の銀化サクラマスの飼育水を人為的に漸次海水で置換して海水割合を高めながら飼育した非給餌群と給餌群について海水移行の腸内菌叢におよぼす影響を調べると共に淡水中で餌止め飼育をした群を対照に餌止め飼育の影響を観察し次のごとき結論を得た。1. 給餌飼育群では海水移行による腸内生菌数の変化はほとんど認められずその菌叢は淡水飼育時にその主体を成した日高らのいわゆる陸型のAeromonasが漸次好塩型のPseudomonasおよびVibrioに置きかわり遂にはVibrioがその主体を成すに至つた。2. 非給餌飼育群では腸内生菌数は急激に減少しその傾向は特に飼育水中の海水割合の上昇につれて著しくその構成菌叢は一時複雑化したが徐々に単純化する傾向を示した。しかしこのような供試魚もその後の給餌により生菌数の増加と魚体の衰弱による餌料の菌叢の影響が観察された。3. 海水移行後餌止め飼育した供試魚も腸内生菌数は減少したがその菌叢はVibrioが主体を成した。4. 終始淡水中で餌止め飼育した供試魚も経日的に腸内生菌数が減少したが比較的長期間Aeromonasが菌叢の主体を成すことが観察された。5. 以上の結果から魚類は腸内菌叢に対する固有の菌種選択能を有することを推察した

nihon suisan gakkaishi/nippon suisan gakkaishi

Studies on the Intestinal Microflora of Salmonids. II, Effects of Artificial Transplanting from Fresh Water into Sea Water on the Intestinal Microflora of Feeding and Non-Feeding Fish