There are some good sized fish in Dragon for sure. Chironomids are a good suggestion but my best personal experiences came from fishing big dragonfly nymphs on sinking lines. One very memorable day started out rather slow. After lots of casting, fly changes, line changes, and searching I tied on a very large rabbit strip with marabou leach pattern in black with a fast sink line. I either trolled it very quick or used a very fast and aggressive retrieve which resulted in a first cast big bow. Several followed and with the occasional break off which had me use some additional coulours in a red/black, browns, olives, maroons, and inexplicably a chartruese. The charteuese pattern resulted in my biggest fish to the boat that day.