Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

A small, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

Stream photos

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 Recently Added Photos

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

flavistriga broods

This topic is about the Mayfly Species Baetis flavistriga

This is one of the most widespread and abundant Baetis species, and it may produce fishable hatches under a variety of conditions.

This species is known in angling books by several old synonyms, including Baetis quebecensus, Baetis levitans, Baetis cingulatus, and Baetis phoebus, in addition to the correct name.

Example specimens

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Male Baetis flavistriga (BWO) Mayfly Nymph

Dorsal view of a Male Baetis flavistriga (Baetidae) (BWO) Mayfly Nymph from the Dosewallips River in Washington

This nymph keys to Baetis assuming the villipore is present (hard to see in my photos or scope), and within that genus it tentatively keys to the flavistriga species complex, of which Baetis flavistriga itself is by far the most common in Washington state, so that's the most likely ID.

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Baetis flavistriga (BWO) Mayfly Nymph

Baetis flavistriga (Baetidae) (BWO) Mayfly Nymph from the Kwethluk River in Alaska

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Baetis flavistriga (BWO) Mayfly Nymph

Dorsal view of a Baetis flavistriga (Baetidae) (BWO) Mayfly Nymph from the East Fork Big Lost River in Idaho

This specimen keys to the Baetis flavistriga complex, which could be either flavistriga or Baetis phoebus.

Konchu

Site Editor
Indiana

Posts: 498

Konchu on Jan 17, 2009January 17th, 2009, 11:21 pm EST

Anyone have observations that they are willing to share of different flavistriga broods?

Jason says that B. flavistriga is a "combination of widely varying types in different places, it's hard to piece the information together into reliable hatch dates for the different broods in any given location." This is stated very well.

As part of my bug work, I'm trying to tease apart some of these "varying types" to see what, if anything, they might represent. Tapping into the experience base here might help.