Comparison of Protection in Rainbow Trout (Salmo gairdneri) Inoculated with and Fed Hagerman Redmouth Bacterins

✍ Scribed by Anderson, Douglas P. ;Nelson, John R.

• Book ID: 120995027
• Publisher: Canadian Science Publishing
• Year: 1974
• Weight: 122 KB
• Volume: 31
• Category: Article
• ISSN: 0015-296X
• DOI: 10.1139/f74-035

✦ Synopsis

Rainbow trout (Salmo gairdneri) fed 1.0 mg Hagerman redmouth bacterin per fish for 2 wk had no detectable specific, circulating, agglutinating antibody. In fish given a single subcutaneous inoculation of 1.0 mg of bacterin per fish, antibody was present from 3 wk later until 3 mo later, when the final sample was taken. Median lethal doses at various intervals after the bacterins were administered indicated that the inoculated fish could withstand a greater challenge by subcutaneous inoculation of the virulent bacteria than the orally immunized fish. The fish fed the vaccine lost their protection within 6 wk, whereas the inoculated fish had high levels of protection through 3 mo. The degree of protection was also confirmed by a "natural" exposure challenge.