ハマチの連鎖球菌症における餌料経由の人為経口感染について

概要

論文の詳細を見る
The peroral inoculation experiments are consedered to be important in the study for establoshing preventive measures against the streptococcicosis of yellowtail.Until now, it has not been possible to reproduce the streptococcicosis in yellowtail with typical symptoms, so that in this study it was examidned how to reporduce the typical symptoms, by the peroral inoculation method through food. The typical symptoms of the disease observed in the peroral incoulation tests were as follows: opthalmitis with bloody pus, redness at eyeball; melting of branchiostegal membrane, caseous pus and redness at inside of operculum; caseous pus at basal part of fins and caudal peduncle; bloody pus, redness at the part between palatine and vomer; rredness of arterial bulb, thickening of epicardium and adhesive epicarditis; thickening of serosa, congestion and bleeding at liver. These symptoms appeared within 2 weeks after doseing the pathogen, when the pathogen was mixed into homogenized fish meat or injected under the skin of food fish. It was not so important to add the culture fluid of pathogen for promoting the appearance of symptoms. The effective number of pathogens dosed was 105 cells per individual yellowtail werghing 300-500g in boby werght in the case of mixing pathogen into homogenized fish meat, and 109 cells per individual yellowtail in the case of injecting pathogen under the skin of food fish.
日本水産學會の論文