|....................... ......Fly Fishing Yellowstone National Park
Fly Fishing Yellowstone - Tricorythodes (Tricos) - Nymphs
The Tricos (Tricorythodes) are called the White Winged Curse by many. It can
be a tough hatch to match. It is a very small mayfly that hatches in slow moving
or still water. They exist in many streams in Yellowstone National Bank. There
are about three species that are important to anglers. Fortunately all three, the
minutus, stygiatus and allectus all very similar. I am not certain which ones hatch
in Yellowstone, but it makes no difference. Some species are bi-brooded,
meaning they hatch twice a year. The nymphs are crawlers that live on the soft
bottoms usually where there is a lot of vegetation. You can catch trout on the
nymphs year-round, but especially during the first part of the hatch.
The "Perfect Fly" Nymph can be fished in the surface skim with no added weight.
You can even grease them up if you want to. We rather use one of our emerger
flies than the nymph for emerging Tricos. We also prefer to fish them weighted
with non-toxic weight so they can be fished at any depth. If you are fishing a
stream with a large Trico population, fishing a nymph at any time is not a bad
You can fish it without or with a strike indicator. Most anglers prefer the strike
indicator. We think the best presentation is up and across without a strike
indicator. This lets you get closer to the trout, make short cast and have a much
better view of your leader. This helps detect strikes.
As with many mayflies, the best time to fish the nymph is during a hatch. If the
water is very smooth or slick such as it is in some of the streams in the park, you
may want to use a down and across presentation.
Copyright 2009 James Marsh