Stoneflies & Weather?

While my experience with salmon flies is very limited, I have observed that Skwala stoneflies tend to keep under and between the rocks as they make their way ashore and do so largely during the lower light periods of the late afternoon and evening; a sensible choice to avoid avian predation. Newly returned Redwinged Blackbirds seem to be particularly interested in seeking them out.
Preston, most years if I time my trip right the bushes along the river are full of salmon flies. Interesting, I've never seen birds go after them in the bushes though they would be easy targets. You do see swallows grabbing them out of the air when the females are flying upstream depositing their eggs

At the peak of the hatch on a warm evening - right at dusk- the females will swarm and thousands of salmon flies will fill the sky. It is quite a sight.


Hi Roger, thanks for the welcome. And yes it would. :)
Arlen!!! You're here! My favorite bug guy and macro photographer!

Posting your photos here is very, very easy. Your shots have always amazed me as to how you get the bugs to model for you :) .

Seems to me I recently read a chapter from your book in FFM...
Hi, Gene. Good to see you posting here, and I really appreciate the kind words. It looks like there are is a lot of interest here in the bugs of fly fishing; and some very knowledgeable folks like Roger to shed light on the subjects (to put it in photographic terms :)).


Yup, 27K members from all over the world means this place has a huge knowledge base. Now that you're posting it has increased that much more.

Lot's of neat forums here. The Fly Tying Forum is also a wealth of information... the SBS section is great.

Hope you continue to contribute.
Not all stones crawl out on the bank. From Rick Hafele:

There are some interesting exceptions to this normal emergence behavior however. Several species have been observed emerging directly in the surface film similar to a mayfly nymph. One species, Isoperla longiseta, has actually been seen walking on the underside of the surface film in some Alberta streams, apparently looking for floating debris to crawl out on for emergence. Because of such varying emergence behavior, you should study both the insect behavior and fish feeding behavior carefully before selecting your fly and fishing technique during a hatch of little yellow stones.


Active Member
Interesting, but there seems to still be some controversy as to whether the Yellow Sally actually does emerge in open water. Ralph Cutter, a very astute observer, is convinced that such reports are instances of ovipositing females being mistakenly identified as emergers.


Even if Rick has ran into some freakish stonefly theory? fact? the vast majority of stoneflies crawl out of the water. There's always some weirdass critter out there that just has to be different from all the others :)