Near an otherwise tranquil Washington river, a bewildered Chinook salmon flops out of what looks like an air-conditioning duct, tail flapping fruitlessly. This is not an accident, or animal cruelty, or even a new way to deliver sushi. It is a moment engineered by man. Specifically, it is a moment engineered by a man with a cannon that shoots fish. It is also, one company hopes, the future of ecological conservation.