Copper River fish are wonderful but much of that comes from the first major river to come into season. Everyone is hungry for fresh, not frozen. The truth is any of the very long rivers with a spring run of salmon produce wonderful fish. After that, very fresh is the key much like any fish. The reason long rivers are better is the fish spawn in the fall. Since the fish really don’t eat much after entering fresh water, they have to rely on stored fat to make it. These fish are caught at the river mouth. Great marketing too.