Your friends on the Russian river have almost definitely caught/seen tule perch. However, I can not vouch for the starry flounder living there. Tule perch are very common on the Russian river. My thoughts are that they would make good aquarium mates (I've never kept them). But they don't appear to be very skittish in their natural state, that is usually a good sign of domestic adaptability.Sounds interesting. I have family that live/fish on the Russian, I'll ask.