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Million salmon would return to the columbia every year. now it's about a million. >> and most of those are hatchery fish with weaker genes and less fat than their wild cousins. so the southern resident killer whales that live on chinook are starving. there are only 73 of this kind of orca left on the planet. and after a grieving mom pushed her dead calf around pujet sound for weeks last summer, it rekindled a debate, salmon versus dams. >> what would you say to folks who say the best thing that could happen for these animals is to take these dams down? >> i'd say for the army corps of engineer...

Million salmon would return every year, the greatest salmon fishery in the world. and now it is about a million. >> reporter: and most of those are hatchery fish. with weaker genes and less fat than the wild cousins. so the southern resident killer whales that live on chinook are starving. there are only 73 of this kind of orca left on the planet. and after a grieving mom pushed her dead calf around puget sound for weeks it rekindled a decade's old debate, salmon versus dams. >> what would you say to folks that would say the best thing that could happen for these animals is to take the dams do...