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Conclusion: After comparing toxin amounts with EPA health guidelines, the researchers made these recommendations:
People should eat farmed salmon no more than once a month to avoid risk from the cancer-causing toxins they contain.
It is safe to eat as many as eight meals of wild salmon a month.
The Broughton Archipelago has received enormous attention since the collapse of its 2002 pink salmon run. From an expected 3,600,000, only 147,000 spawners returned. Though wide fluctuations in pink salmon populations are natural, analyses conducted by both the Department of Fisheries and Oceans Canada (DFO) and the Pacific Fisheries Resource Conservation Council (PFRCC) showed that the Broughton collapse was not “natural” . Many people, including fisheries biologists, First Nations, other local residents, commercial fishermen, and conservationists believe that the pink salmon “collapse” stemmed from a massive kill of outward migrating juvenile pink salmon in 2001, and that the kill was caused by sea lice originating in local salmon farms. The Broughton Archipelago has British Columbia’s densest concentration of fish farms, with 29 farm tenures, 17 of them active in 2003 . Most of the farms are located directly on salmon migration routes . Evidence suggests that juvenile pinks were infested with sea lice during their outward migration, when the threat from sea lice is normally low, because adult salmon are normally scarce at that time of year. The salmon farms made sea lice available precisely when the pinks were most vulnerable to them .