Target species
Rainbow trout (Oncorhynchus mykiss)
Indications for use
In Rainbow trout of 2 grams weight or over: Active immunisation against Enteric Redmouth disease (ERM) to reduce mortality caused by the Hagerman Type I strain of Yersinia ruckeri. 336 degree days are required for the development of full immunity (28 days at a water temperature of 12 °C). The time for development of protective immunity will depend on water temperature.
A duration of immunity of 78 days has been shown under laboratory conditions.
Under field conditions, protection may be expected for at least 6 months.
A booster vaccination administered 4 months after primary vaccination may induce a better level of protection.
Contraindications
None.
Special warnings for each target species
Only vaccinate healthy fish.
Special precautions for use
During vaccination, the temperature of the diluted vaccine should not differ from the water temperature in the holding area by more than ± 5 °C.
Fish should be subject to the minimum of manipulations such as sorting and transportation during the periods shortly before and after vaccination.
Operator warnings
Personal protective equipment consisting of rubber gloves should be worn during all vaccination operations.
Adverse Reactions
None.
Use during pregnancy or lactation
Do not administer to fish intended as broodstock or to broodstock.
Interactions
No information is available on the safety and efficacy of this vaccine when used with any other veterinary medicinal product. A decision to use this vaccine before or after any other veterinary medicinal product therefore needs to be made on a case by case basis.
Amounts to be administered and administration route
The product is administered to Rainbow trout of not less than 2 grams in weight by immersion for 30 seconds in vaccine diluted 1 in 10 with hatchery water.
1 litre of vaccine, diluted to 10 litre in total, is sufficient to vaccinate 100 kg of fish.
Fish may be vaccinated in batches. The size of each batch should be appropriate to the volume of diluted vaccine available and to the size of the fish.
The diluted vaccine should be oxygenated, if necessary, between vaccinations of individual batches.
Overdose
No adverse effects have been noted following a double dose of vaccine.
Withdrawal periods
Zero days.