It's an interesting question. Canada is a very small player in the hatchery production game. The massive programs in Japan and Russia and in elements of Alaska really produce a hundredfold times more fish than we do in that.
The problem is that the fish will mix in the ocean. When we went out and sampled in the Gulf of Alaska in the winter, we had fish from Russia, the Yukon River and Japan. These fish are highly migratory.
Then there are many science papers involving statistics that show competition between different countries' fish and our fish.
If there is a limitation on food supply—which I don't know is really demonstrated as well—it looks like there is actually competition between species and countries.
The other international point, of course, is the illegal fishing at sea, which seems now to be coming back a bit and is a concern, but that's a different question from the competition between salmon species.