Blue Winged Olive Hat

The Blue-winged Olive mayflies have bodies that are a shade of olive, and a dun or blueish colored wing. The blue-winged olive (BWO) is not one species, but a group of them in the genus Baetis, Attenella, and smaller drunella, and are generally smaller mayflies. To match the BWO with an imitation during a hatch, is to get the size right. These tiny mayflies populate the rivers half the year, when most people don’t fish. Hatches can begin in late September and continue until April. A great gift for the fly fisherman.