Vibriosis of Ayu in Shizuoka Prefecture, from 1984 to 1990
Serotype and Drug Sensitivity
1993 Volume 28 Issue 2 Pages 77-82
Details
1993 Volume 28 Issue 2 Pages 77-82
Serotype and drug sensitivity were studied for vibriosis in ayu Plecoglossus altivelis farms in Shizuoka Prefecture from December 1984 to November 1990. Among 149 strains of V. anguillarum isolated from the diseased fish, 115 (77.2%) and 34 (22.8%) strains were classified to the serotype A (J-O-1) and C (J-O-3), respectively. Serotype C was isolated mostly from cultured ayu raised from seedlings of sea water origin. Fifty one percent of isolated serotype A were from ayu raised from freswater seedligs while other 49% were from those from sea water origin. Serotype C isolates were found from December to May and the most frequently in February. On the other hand, serotype A appeared in January and dominated from June to September.
Drug resistant V. anguillarum was most frequently isolated from April to July. Incidence of drug resistant isolates were higher in serotype A than in serotype C.
Based on these results, the application of vaccination for ayu seedlings of sea water origin is also recommended. Development of a bivalent vaccine for both serotype A and C is needed.
