Trout - ERM
Overview |Dosage/Administration|Efficacy|Description
Key Benefits:
- Demonstrated cross protection against a range of clinically significant Y. ruckeri isolates from Europe, Norway and Chile.
- Proven immersion vaccine with more than 1 billion doses used in European trout farming.
- Essential part of disease control program for the most widespread endemic disease of farmed trout.
- Can also be administered by injection
- Excellent safety profile
- Convenient AquaVac* ERM Oral is available as a booster product to extend immunity throughout the salmon production cycle
- AquaVac* ERM is administered by immersion to trout fry between 1 and 5 grams. Optimum protection is achieved at 4-5 grams
Specific Recommendations
Spring-fed Hatchery
These hatcheries will have a constant water temperature and no risk of ERM. In this case immersion vaccination should be carried out on healthy fry of 4-5g or 10-14 days (at 10oC) prior to transfer to infected ongrowing sites.
River water-fed Hatchery
Hatcheries supplied by river water face 2 potential problems.
- Firstly, low water temperatures over the winter period will make it difficult to carry out a good immersion vaccination.
- Secondly, there is potential risk of ERM outbreaks at any stage of the hatchery cycle.
For these reasons it is important to give the fish at least some level of protection as early as possible in the production cycle to reduce the chances of an early outbreak and possible carrier status being attained which can reduce efficacy of vaccination at a later date.
In this case immersion vaccination of 1g fish should be carried out to confer initial protection and then an immersion booster vaccination carried out at 4-5g to confer protection for the initial part of the ongrowing cycle.
Primary Vaccination with AquaVac* ERM
- Immersion vaccination against ERM was established in the early 1980's. AquaVac* ERM immersion vaccine has been shown to reduce mortality during the first few months of the production cycle
- A booster vaccination with AquaVac* ERM Oral is recommended to extend level and duration of protection, particularly towards the end of the growth cycle.
AquaVac* ERM is an aqueous vaccine containing inactivated cultures of Yersinia ruckeri (Hagerman I strain).
Administered to small fry the vaccine is well tolerated and easy to use with minimal disruption to the production process. This single vaccination will provide good protection for periods of 4-8 months.
Depending on the hatchery water source, 2 alternative routes are recommended for immersion vaccination against ERM. AquaVac* ERM is administered by immersion to trout fry between 1 and 5 grams. Optimum protection is achieved at 4-5 grams.
Technical Bulletins
* Trademark Overview|Dosage/Administration|Efficacy|Description |
