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.

Two major forks of this grayling stream come together in this pretty pool.

From the Chena River in Alaska

Stream photos

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Skwala (Large Springfly) Stonefly Nymph Skwala (Large Springfly) Stonefly Nymph

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington

This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.

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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.

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A few bugs from the Kinderhook Creek (NY)

Agresens has attached these 2 pictures to aid in identification. The message is below.

Agresens
Kinderhook, NY

Posts: 3

Agresens on Jun 17, 2018June 17th, 2018, 11:57 pm EDT

Two images - please help identify.

The NYMPH appears to be a Hendrickson?

The DUN was quite large. Seems like it had just hatched with malformed wings. A Drake?

Thanks

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jun 18, 2018June 18th, 2018, 5:45 pm EDT

Hi August-

I believe (what you refer to as the dun) is actually a male imago of genus Isonychia

I also believe (what you refer to as a Hendrickson), which is a common name often used for Eastern Ephemerella, is probably of genus Drunella.

The next time you photograph a mayfly nymph, I suggest using a pickle jar lid, and filling it with enough water to completely cover the nymph. That way, the body appendages will stand out, as opposed to being all stuck together.