Hatch Guide Below you will find links to pages that show you some of the insects you see hatching on the water and some of the flies that are used to immitate them. I have tried to break them down into four groups; Mayflies, Caddisflies, Stoneflies & Midges. Of course, there are far too many for me to cover all of them but these are a few of what I think are the most common. If there is somthing special you want to see let me know. 1st group are Mayflies Blue Wing Olives 2nd group are Caddisflies Spotted Sedge 3rd group are Stoneflies Giant Salmonfly 4th group are Midges Midge