The dreaded Mayfly hatch is one of the toughest times for most anglers to catch walleye. Mayflies will hatch out of the mud and as they swim up to the surface, walleye will feed heavily on them throughout the water column. Anglers report a lot of success by fishing with half nightcrawlers and leeches on the bottom and suspended throughout the water column. Because Mayflies hatch in such large numbers, there will be so much food in the water for walleye to eat. This makes it very difficult to catch walleye during the Mayfly hatch. If you put in the time and spend your time fishing the mud flats, you will have a better chance to put some walleye in the boat.