Environmental screening of veterinary medicines used in aquaculture – diflubenzuron and teflubenzuron

This screening survey investigated the occurrence of two benzoylurea chitin synthesis inhibiting pesticides, diflubenzuron and teflubenzuron, used for the treatment of sea lice infestation in salomoid aquaculture. Detectable concentrations of diflubenzuron and teflubenzuron were measured in sediment, particulates, amphipods, brown crab, blue mussel and shrimp where sea lice treatment had occurred. Neither of the compounds were detected in any cod samples nor in any sample collected from the reference location.