Salmon Farms infect wild salmon.

October 6, 2006, Hour Two: Richard Dawkins / Salmon Farming: "A new study suggests it might, finding that juvenile migrating wild salmon are becoming infected by sea lice as they pass salmon farms.“We counted sea lice on more than 14 thousand juvenile salmon migrating past fish farms, and conducted mortality experiments with more than 3 thousand fish,” explained Martin Krkosek, one of the authors of the report, describing how the study was performed. "