I recall one spring when the steelhead were kelting out during a Carpenter Ant emergence. One female in particular was gorging on them. She was spawned out but her belly was already firm and tight and she was rather bright. I have often thought that dry fly fishing in May or even June for some of the kelts would actually be interesting. Especially of they are actively eating and recovering. Conservation wise probably not a good idea, but I'd bet a nice bright hen sucking down that dry would raise the pulse.