Distribution and Persistence of Diflubenzuron and Teflubenzuron in the Marine Environment Around Salmonid Aquaculture Facilities

To achieve a sustainable salmonid aquaculture industry, the environmental impacts of chemicals used to treat sea lice (Caligidae) infestations need be considered. Our ability assess risks associated with these treatments in relation human and wildlife health is limited by lack information on their concentrations marine coastal environments. Diflubenzuron teflubenzuron are chitin synthesis inhibiting insecticides frequently Norwegian salmon farms. In present study, distribution, persistence bioaccumulation both compounds were assessed sediments benthic macrofauna collected at four aquacultures sites. Both detected sampled 30–1400 m from selected farms 8–22 months after last took place. was above limit quantification (LOQ) 76% sediment samples measured levels ranged between 2.4 257 μg/kg dry weight (dw). Teflubenzuron LOQ 92% samples, ranging 1.3 3474 dw. all where diflubenzuron detected, exceeded quality standards (EQS ; 0.2 0.0004 dw, respectively), indicating that may pose risk species living near fish wild fauna sites residue low micro-gramme per kilogramme wet range. The economically important caught for consumption, such as pink shrimp ( Pandalus montagui ) Norway lobster Nephrops norvegicus ), substantially lower than biota EQS’s maximum limits (MRL) set EU tissue. Further studies needed fully understand ecological environment, potential lethal sub-lethal effects occur non-target organisms following chronic exposures.