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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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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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.
Bjorntofish
Posts: 1
Bjorntofish on Jul 2, 2012July 2nd, 2012, 8:50 pm EDT
Friday, the PC stoneflies were hatching and flying midway up the river in the quality stretch of the South Fork of the Boise Rive (Idaho.) The fish seemed to be gorged with nymphs and only wanted the big nymphs fished in the current. We used large black Brooks flies with rubber hackle. They ignored most of the adult flies that fell to the surface. But the big bombers were lumbering over the water all day. Pretty exciting environment for fishing. At one point, I had two crawling on my neck while I was trying to work my drift into a large fish's feeding lane. Life is good.

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