Little Yellow Stoneflies
.............................Fly Fishing Yellowstone National Park
05/19/08

Little Yellow Stoneflies (Perlodidae Family) - Nymphs

Nymph:
All of the species of this family of stoneflies live in fast water. They must have fast
flowing, clean water to survive. Prior to the hatch, the Little Yellow Stoneflies will move
along the bottom from their fast water habitat to the banks to hatch. Some of them crawl
up on stones that protrude out of the water to hatch but the majority use the banks. Just
as soon as they get out of water, they shed their shucks and fly away. The best chance
the trout have to eat them is during this migration prior to the hatch. Often, the trout will
actually intercept them along the banks.
These different species of Little Yellow Stoneflies hatch at different times of the day
depending on the species. Most of the Yellow Sallies, or species of the
Isoperia genus,
hatch in the afternoons. The warmer the weather, the later the hatch. However, the
nymphs will crawl to the banks throughout the day. The later in the day, the better the
fishing usually is, but you can take trout imitating the migrating nymph anytime during
the day.  The
Suwallia pallidula species is another Little Yellow Stonefly found in the
park in plentiful quantities.
Presentation:
If you walk up to the bank and cast or if you walk up to the bank and wade into the
water, you may have spooked the trout you are trying to catch. You should first cast to
the banks from a short distance away from the banks. Bring the nymph on the bottom
all the way back to the bank. Remember, the trout do not have to see you to spook. If
you are not careful, they can hear you walking on the bank close to the water through
their lateral line. Ease up to the stream as quietly as possible without kicking rocks, etc.
When you do get in the water, wade away from the bank about a rods length and fish
the nymph down and across allowing the nymph to swing back to the bank. This will
work much better than a up stream cast. Continue to move downstream a foot or two
each cast covering all of water along the bank. If you cast out a few feet, say ten or
fifteen feet using a reach cast that ends with your rod pointing towards mid-stream, you
can slowly swing the rod back in the opposite direction pointing it towards the bank.
This will swing the fly from several feet out in the stream all the way to the bank. In other
words you can cover approximately twenty to thirty feet of water each cast. Of course,
this changes with the particular stream and stream composition. If there is a run near
the bank, you may only need to swing the fly a few feet. You will need to make longer
cast than if you are fishing upstream. You need to keep the fly twenty feet or more away
depending on the water. In shallow water you may need to keep the fly thirty feet or
more from you to keep from spooking the trout. Remember, the trout will be facing you
when you fish downstream. Make sure you keep the fly on the bottom. If it is swinging
up off the bottom  mid depth or near the surface, you are not going to catch many fish.
Weight it down with a non toxic weight, keep your line mended and keep it right on the
bottom. When you pick it up slightly off the bottom, the fly will swing towards the bank a
few inches. Allow it get back on the bottom before you lift the rod again.


Coming Up Next:
Little Yellow Stoneflies - Adults

Copyright 2008 James