Vaccination Strategy

Norvax® Strep Si is a monovalent vaccine containing an inactivated strain of Streptococcus iniae. The vaccine induces protective immunity in warmwater fish of both marine and freshwater environments against streptococcosis caused by Streptococcus iniae. Streptococcosis will affect the fish in the grow-out facilities. Therefore, fish should be vaccinated before they are put into cages, pens or ponds.

If fish have to be transferred before reaching injection size (≥ 20 g), immersion vaccination should be done on smaller fish (≥ 3 g) one to two weeks before transfer. Then, when reaching injection size, fish should receive a booster vaccination by means of a single intraperitoneal injection that will protect them up to market size.