Baetis is a genus of mayflies of the family Baetidae, known as the blue-winged olive to anglers. There are at least 150 described species in Baetis. [1][2][3][4] They are distributed worldwide, with the most variety in North America and northern Europe. [5] About 48 species occur in Europe including: [6] ^ "Baetis Report".

Learn more about Troutnut or support the project for an enhanced experience here. This is one of the most prolific genera of mayflies in North American trout streams.

Mayflies (also known as shadflies or fishflies in Canada and the upper Midwestern United States, as Canadian soldiers in the American Great Lakes region, [2] and as up-winged flies in the United Kingdom) are aquatic insects belonging to the order Ephemeroptera.

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By proxy, the BWO is the most important mayfly to all fly anglers. The reason is, the BWO is the only mayfly that hatches twice a year. It’s the first mayfly to emerge in the early spring and the …

Baetis tricaudatus is undeniably the most widespread and abundant baetid on the continent and arguably the most important mayfly species to trout and anglers alike. Eastern anglers used to know these important mayflies by the storied name of Baetis vagans.

Blue-Winged Olives are not the only mayfly of significance, but in fall and spring, knowledge of Blue-Winged Olives, their hatches, and specific fishing tips to use will help you catch more fish. Hatches of Blue-Winged Olive mayflies see adults fluttering slightly above the surface and then the adults land on the surface to lay eggs.

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The Blue Quills are small mayflies (hook size 16-20) but they can hatch in incredible numbers at a time when eager trout are just beginning to look to the surface after a hungry winter. Bare-bones, actionable information for anglers encountering this hatch:

May 19, 2024 · Females drop their eggs while flying low over the water, or by dipping the abdomen; some go underwater to lay eggs. Mayflies are the only insects that molt in winged condition. There may be from several to dozens nymphal instars.