I was out walking my hound this morning. There were tiny mayflies everywhere. I laughed, tricos. They are the tiniest mayflies we have. They are size 22 or smaller. Yes the trout will definitely dine on tricos. I often will fish a black gnat that represents a cluster of trikes. I also see PMDs each morning. Oh the browns on the Red Deer River love PMDs! I like fishing a light cahill, a PMD Comparadun or a standard PMD may fly imitation. Don't forget a few spent PMDs, there are times that the trout will focus on the dead PMDs from the spinner fall.
Oh yes, as you can see, I have to wash my back window.