Sea lice are becoming more resistant to pesticides. Outbreaks on open net pen salmon farms make it possible for lice to move from farmed fish to wild fish. Young migrating wild salmon can be harmed or killed when heavily infested.

Fisheries and Oceans Canada requires all fish farms in Canadian coastal waters to have a sea lice management plan. The federal department also places a limit of three lice per salmon during the spring when young salmon are out-migrating and are most vulnerable.

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