This is the Midge adult. The smaller the size the better!
Midge patterns are an essential part to any fly fishermen’s box. Nearly every river in the world has midges present year round and fish are almost always willing to eat a correctly presented midge. At times, fish will give up their pursuits for these small bugs and focus on something larger, but it is always a good guess to start the day off with midges until you see something else going on in the river.