Most recently added comments / posts to this topichttp://www.fishingbuddy.com/lake_oahe_nd_sd_questionsposted by: Total Outdoor Network. &nbsp;There was definitely plenty of those in the walleye I cleaned along with a few other unknowns, but the majority was what was described in the link you posted. &nbsp;Thanks for the resource!http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2838932009-06-01 22:46:53http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283893posted by: DecoyVC. I worked at the VCSU macroinvertebrate lab for 3 years.&nbsp; This key is some of the work we did.&nbsp; This should have all you need to know about mayflies.&nbsp; You can id them by using the key if you'd like.&nbsp; This site was put together in ND and has nearly all aquatic insects found in ND.&nbsp; Enjoy&nbsp; http://www.waterbugkey.vcsu.edu/php/orderdetails.php?idnum=8 <br type="_moz" />http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2838882009-06-01 22:03:13http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283888posted by: Rowdie. I didn't think they were mayflies, but I seen a small mayfly the day before,&nbsp; exact same thing as a mayfly just smaller.&nbsp; Close cousin??&nbsp;&nbsp; I'm no biologist, but I could tell they were stuffed full of some type of fly larve.&nbsp;http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2838462009-06-01 16:28:51http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283846posted by: Total Outdoor Network. &nbsp;Well did some research and called the ND GFP and one of the biologists was fishing the same area last weekend that I fish. &nbsp;He opened them up and they're definitely fly hatches of many sorts actually. &nbsp;They definitely weren't freshwater shrimp, althought there are some in Oahe, but not many. &nbsp;http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2838292009-06-01 14:32:23http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283829posted by: Rowdie. I wasn't the one taking the fillets off the fish, I was the one taiking the rib bones and skin off the fillets, but my partner said they were full of mayflies.&nbsp; Remember, the mayflie lives as a nymph in the water for 2 years before they mature enough to change into the fly.&nbsp;http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2835372009-05-29 10:05:17http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283537posted by: Goosefishmen. I would guess it to be mayflies right now.&nbsp; Haven't fished Oahe yet, but down in south central part of state last weekend and the eyes were full of mayflies.&nbsp; Sounds like the mayflies were just starting to hit DL and should be in full force by this weekend.&nbsp;&nbsp;http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#2835292009-05-29 09:01:42http://www.fishingbuddy.com/lake_oahe_nd_sd_questions#283529