It's pretty easy to tell the salmon smolt from the rainbows. The pattern on their sides is pretty obvious. And i always thought the steelhead smolt look a little similar to the salmon smolt a little less silver than the salmon. But that i'm not sure of. You do catch one now and then but most are rainbows. That's why we stuck with yellow. It picked up more rainbows than not. White seems to be the color for salmon, from smolt up to adult, even spawners.