This is the second most common Epeorus species in the East and Midwest. Most anglers will encounter sporadic hatches of Epeorus vitreus once in a while, and sometimes a more concentrated emergence causes a good rise of fish. Where & When
» Species vitreus (Sulphur)
Regions:This Midwestern hatch of Epeorus vitreus is a week or two behind the Eastern emergence.
East, MidwestTime Of Year (?):
Mid-May through early September, peaking in May-June
I believe I encountered a fishable hatch of this species in the Catskills in early September, but I could not positively identify the flies.Hatching Behavior
Time Of Day (?):Epeorus vitreus emerges underwater. The duns reportedly leave their nymphal shucks (Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.) while rising to the surface rather than on the bottom.Spinner Behavior
Late afternoon and evening, peaking at duskHabitat:
Time Of Day: Early evening; later on hot daysThe females oviposit by flying low over the water and repeatedly dipping their abdomens in and out. When they're done, they fall spent (Spent: The wing position of many aquatic insects when they fall on the water after mating. The wings of both sides lay flat on the water. The word may be used to describe insects with their wings in that position, as well as the position itself.) with the males.Nymph Biology
Current Speed: Medium to fastThese mayflies survive under a wider range of conditions than Epeorus pleuralis, but they do require a rock or gravel bottom. They do best in fast water.Epeorus vitreus Fly Fishing TipsAt a distance, this species is easily mistaken for other Sulphur species like Ephemerella invaria by the untrained eye who does not look beyond size and color. This is one more reason to quickly collect a dun if you're having trouble matching a Sulphur hatch.
Substrate: Boulders and gravel
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