Undesirable substances include those that may be present at trace levels in the environment or in raw materials used in fish feed (e.g. dioxins, PCBs and heavy metals) and residues of medicines used to treat disease.
We have a global monitoring and control programme for undesirable substances, using laboratories approved by Marine Harvest and applying accredited methods.
In the case of disease outbreakes, when fish welfare may be compromised, it may be necessary to treat the fish with medicines. These medicines are prescribed by certified veterinarians. They are applied only under veterinary supervision by trained operators and in accordance with legal requirements. Specified withdrawal periods are strictly observed and fish are checked for any residues before harvest.