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Factory farming is threatening to wipe out wild salmon populations in Norway - due to the dramatic spread of parasitic salmon lice. Can the wild salmon still be saved? On Norway's vast salmon farms, a parasite is causing mass deaths of fish. Salmon lice have gotten out of control, infesting not just farmed salmon but also the wild salmon that swim between the sea and Norway's rivers . The parasites are finding their way into open water from the open-net cages of off-shore salmon farms, where millions of fish swim. Fishing enthusiasts, scientists and environmentalists are fighting to preserve the wild salmon as well as the culture it represents.