At the risk of exposing my own ignorance, can anyone tell me a reliable way to tell the difference between a resident rainbow and a steelhead smolt? (Let's assume we're fishing on an anadromous fish-bearing stream.) I have caught what I thought were RBs on the Snoqualmie (below the falls), Skykomish and Tolt. (I'm not talking about the little buggers that will hit anything, which I have always assumed to be smolts and try to avoid if they're coming after my fly.) On the one hand, I heard once from a local steelhead guide that there aren't really resident rainbows on the anadromous fish-bearing Puget Sound rivers, but I have a hard time buying that because I have read in fishing guides and in the WDFW's own literature that there are RBs in these waters. I am strictly C&R, so I'd like to think I'm not doing any real harm to a fragile resource, but if I am getting into smolts it would be nice to know know it so I can move on to other opportunities.