CTV's Peter Akman investigates the farming of Atlantic salmon in B.C., a fish whose very existence may be changing the waters forever. Activists and First Nations in B.C. say farmed Atlantic salmon are spreading viruses, lice and disease to native Pacific salmon.

The Sea Shepherd Conservation Society and biologist Alexandra Morton argue the fish farms are raising sick fish. The society's 81-foot research vessel Martin Sheen sails up the B.C. coast to support Morton. Morton's crusade for the past 30 years has been to prove that salmon farms raising transplanted Atlantic salmon for market are the reason for declining wild Pacific salmon.

Includes W5 Extended Interview with Canada's Fisheries Minister:

Fisheries Minister Dominic LeBlanc discusses the federal government's response to concerns over fish farming's impact on wild salmon in British Columbia.