.......................  ....................  ...Fly Fishing Yellowstone National Park

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New KISS Bug Series - Part 30

Spotted Sedges (Caddisflies)

The adult Spotted Sedges (hydropsyche species) are eaten by trout during the hatch and when depositing
their eggs. When the Spotted Sedge pupa change to full grown adults, they are not 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 I have said in previous articles, the trout prefer the pupae because they are much
easier to catch. In a few cases, the trout will hit the full grown adults before they depart the water.

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.  

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 starts
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.

I suggest you first try a dry imitation of the adult. If the activity is fully underway, you should get plenty of
action. If you are not successful with the dry imitation, then you should add some weight a few inches
above the Perfect Fly Spotted Sedge Adult imitation and fish it as a wet fly to imitate those females that
dive to deposit their eggs.

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's usually not very difficult to
catch the trout feeding on the egg layers. It's usually almost dark before the best action begins. The
biggest mistake you can make is to start fishing to early and then quit to soon. When other anglers have
stopped fishing are dinning or having a drink at the local bar, that's when you need to be fishing the
Spotted Sedge egg laying activity.
Copyright 2012 James Marsh
Spotted Sedges:
Availability to trout:             
Hook Size:                          
Type of water:                    
Emergence time:                
Duration of hatch period: