I am pretty sure this is a Stonefly. I know you love that name. LOL! Adults usually don't eat because they are too busy looking for a mate but if they do, they feed on algae and lichens. When you see them it is a sign that the water is fresh and not polluted. Adults lay their eggs in the water. Their young are called naiads and are eaten by fish and frogs. Thanks to this post, I learned something new today and I thank you for that! : )
I will announce on Thursday that I have a Community now and it is called Insect Pub. Here is the link if you want to subscribe:
https://beta.steemit.com/trending/hive-100514
When you post, use hive-100514 as your first tag.