A fish farm in the Dzhankoy district of the Republic of Crimea is developing an innovative way to vaccinate trout fry against diseases using a submersible method. Current practices involve treating fish that are already ill with antibiotics mixed in their food. This new method, which involves immersing the fry in water containing the ErVak vaccine at the fry stage, aims to prevent diseases and eliminate the need for antibiotics in the fish's body when they are sold. The farm's specialists are currently providing this service to other regions and plan to extend it to fish grown and sold in the Republic of Crimea.