From what I have heard from Frank Moore and other old timers on the NU there were definitely a spring run of fish that came in around the end of April and early May. A distinctive early run of fish that were not late winter fish. Different body lines from the winter fish. There may be a remnant population of that strain of fish and you may run a cross a fish or two in May but you really don't start seeing many fish now till later June, even July. We do still see a strain of fish that we call the nostril fish in the fall. A large bodied fish that has way more spots and enlarged nostril holes. Possibly a Canton Creek strain from days gone by. I believe there may have been several distinctive strains of Spring/summer run fish that were acclimated to the various tribs and each of those fish had a slightly different run timing. Now with Steamboat Creek being the only major trib left that has viable spawning habitat,that run timing is now fairly consistent starting in late May-June.