Because the mayflies are sensitive to pollution, a good hatch is a sign of a healthy river. If it seems like you’re seeing them earlier this year, there could be a reason. “Usually we see a ...

SAGAMIHARA, Kanagawa Prefecture--A motorcyclist was injured in an unusual wipeout caused by a massive swarm of mayflies on a local road on Sept. 13. Tens of thousands of mayflies congregated over ...

The blue-winged olive refers to a group of mayflies that belong to the order Ephemeroptera. They are aquatic insects and popular among fly fisherman, as their fly patterns during hatching can ...