We have the same out west here, fish and game stock many lakes out here with Kings,
Sockeye . For some reason they call sockeye Kokanee out here not sure why. I have a good friend who is a fishery biologist, that has been trying to figure out what percent find there way to spawning grounds. They do clip the fin at the hatchery out here. Monty says it's a long day when they start clipping fins. The Sockeye in many of our lakes have found themselves spawning grounds. But now there size is a lot smaller in these lakes now due to competition for food. A couple of lakes here even the Kings have, but not in the numbers they hoped for. The rivers and ocean if you catch a salmon with out a clipped fin must be released unharmed back to the water.