|....................... .................... ...Fly Fishing Yellowstone National Park
New KISS Bug Series - Part 59
Little Sister Caddisfly
The pupae of the Little Sister Caddisflies swim to the surface to hatch. They are very available for the trout
to eat at that time. This is the best time to imitate the Little Sister Caddisflies or Sedges, whichever you
prefer to call them.
The problem with these caddisflies and many other species of caddis is being able to determine when a
hatch is underway. Often the caddisflies are emerging at the same time they are depositing their eggs. If
not, you will probably not notice the hatch is taking place or see the fish feeding on them. Trout eat them
as they swim (aided by air bubbles) to the surface. Occasionally the trout will jump out of the water eating
the pupae and that's one clue but that's not the usual situation. The most you are able to see is usually
just a flash of the side of a trout feeding below the surface. The hatch is usually over before many anglers
even recognize the Little Sisters are hatching.
The hatch usually happens in the late afternoon but later on in the year as the water warms, it may not
occur until dusk. As with most other caddisfly hatches, they start earlier and last longer under inclement
weather conditions. Cloudy, rainy overcast days are the best types of conditions.
Imitations of the pupae should be presented in the same manner as the larva imitation except that you
would not weight the fly as much, if any. You want the fly to swing downstream near the bottom and then
rise to the surface. The naturals rise from the bottom to the surface to hatch and that's exactly what you
want your pupa imitation to do.
Cast slightly down and across and stop the swing of the rod when the fly is directly downstream from your
position. If you determine that they are emerging in a particular area of the riffles or run, then you would
want your fly to rise to the surface in that same area.
To do this, it's best to wade out in the stream directly above but keeping a good safe distance above the
emerging pupae. You have to stay well above the emerging caddisflies or you would spook any trout
feeding on them. You can strip some line out in the current of the riffles and not have to make a very long
cast if you prefer. When the fly is near the bottom in the same area they are hatching, stop the swing and
hold the rod tip up at about a 45 degree angle from the horizon. The fly should rise to the surface in the
surface. Most of the takes come about the time the fly is getting near the surface or when it just reaches