That's a fish fly. It means you're living in a healthy ecosystem

Surface Slicks are Pelagic Nurseries for Diverse Ocean Fauna

Food Web

Wild fish spring to life in Lake Ontario, despite dams, pollution and hatchery competitors

Fly Flying Fish Fly Marine Biology Learning Center

Mayfly - Wikipedia

How to Fish for Black Drum: Best Bait, Rigs & Lures - Florida Sportsman

Eulachon: A Little Fish with Many Names and a Big Ecological Impact (U.S. National Park Service)

Freshwater Animals List, Pictures & Facts, Examples Of Freshwater Species

Heterotrophs