Blue-winged_Olive_flies
Blue-winged Olive flies
Type of fly fishing lure
Blue-winged Olive flies is a collective term used by anglers in fly fishing to identify a broad array of mayflies having olive, olive-brown bodies and bluish wings in their adult form. Sometimes referred to as BWO, a wide array of artificial flies are tied to imitate adult, nymphal and emerging stages of the aquatic insect. While the family Baetidae probably has the most species identified as blue-winged olives, another mayfly family Ephemerellidae also contains some.[1] Collectively, blue-winged olive mayflies are an important food source in most trout streams, thus their widespread imitation by fly tiers.