MN, I also have a MN pond. I noticed last year that I either had a hatch of back swimmers or they were mating and laying eggs. Don't remember when but at one time in early summer there were thousands of these bugs taking off from the water, flying around, and then landing back in the water. I'm familiar with water boatman and these were not the same. They were all black and smaller but they did have the paddles. I did notice that my bluegill were having a hayday scooping them up. Looked like they made fine fish food so I was glad to see them.
