Spotted Sedge - Adults
.............................Fly Fishing Yellowstone National Park
04/22/08

Adults:
When the Spotted Sedge pupa changes to a full grown adult it will not be on the water
but for a very short time for the trout to eat. They depart the water as soon as their
wings dry and that only takes a very short time. As we have said in previous articles, the
trout prefer the pupae because they are much easier to catch. In some cases, the trout
will hit the full grown adults before they depart the water. My guess is they just don't see
the emerging pupae in time to eat them and they end up trying to eat the adults.
After the
Hydrosyche species hatch, they will fly off to the streamside foliage and stay
there to mate. After mating, the females will either dive to the bottom and deposit their
eggs, or dip down to the surface to deposit them. I suppose this is species dependent
but also may occur both ways with different individuals of the same species.  You
should be prepared to imitate them both way.
The females do not start depositing their eggs until very late in the afternoon usually
just before dark. The activity continues on into the evenings. On cloudy, rainy days the
hatch and egg laying activity seems to start earlier in the afternoon. As I mentioned
previously, the hatch is usually still underway during this time the females start to
deposit their eggs. I suggest you wait until you start having poor results on a pupae
imitation before changing to a dry imitation of the adult. You should be able to see the
trout eating the egg layers. They usually make a splashy rise when they feed on the
surface. When they dive to deposit their eggs, you would not be able to see anything
occurring other than a possible flash.

Imitating the Adult Egg Layers:
I suggest you first try a dry imitation of the adult. If the activity is fully underway, you
should get plenty of action. If your are not successful with the dry imitation, then you
should change to a wet imitation of the adult to imitate those females that dive to
deposit their eggs.
Some anglers try it both ways at the same time using a two fly rig. Personally, I do not
like two fly rigs. When I have used them, they remind me that I really don't know what I
am doing. I don't think the more-the better when it comes to imitating aquatic insects.
The two fly rigs (a dry fly with a wet fly below it) will catch fish and they may even tell you
which way the trout prefer the egg layers. If they take the wet fly, maybe they are eating
the divers. I just don't think you can imitate either situation very well using a two fly rig
but it is a popular method.
In rough pocket water or runs and riffles, i suggest you fish up and across making a lot
of short cast. In smooth water, I suggest you make longer, down and across
presentations. It is usually not very difficult to catch the trout feeding on the egg layers.
The sun has set and it is usually almost dark before the best action begins, so the trout
cannot see the fly very well. The biggest mistake you can make is to start fishing to
early. When other anglers are dinning or having a drink at the local bar, that is about
the time you need to start fishing for the egg laying
Hydropsyche.

Coming Up Next:
Spotted Sedges - Hydropsyche species - Additional Information

Copyright 2008 James