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.

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington

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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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Site updates from August 10, 2011

Closeup insects by Bnewell from the Touchet River in Washington

Pteronarcys californica (Giant Salmonfly) Stonefly Nymph

2 Pictures

Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Nymph from the Touchet River in Washington

Here are two size classes of Pteronarcys nymphs. These probably represent two different generations. The largest will probably emerge next spring and the other in two years. There is probably another generation, smaller, I did not collect. In a Canadian study they discovered Pteronarcys eggs do not all hatch simultaneously but hatch for a period of nearly two years, making their egg/nymphal life 5 years. The other photo is of a curled nymph, a typical response to disturbance.

Collected August 9, 2011 from the Touchet River in Washington

Added by Bnewell on August 10, 2011

Collected August 9, 2011 from the Touchet River in Washington and added by Bnewell on August 10, 2011