Hatches Made Easy:

Little Black Caddis - Fishing the Hatch (Pupae and Adult)
1/31/08

Pupae:
The Little Black Caddisfly hatch is the closest a caddisfly hatch will ever get to a
mayfly hatch. The pupae emerge by swimming to the surface and drifting in the
surface film. Often, the emerging pupae or newly formed adults drift a good
distance before they are able to fly away. Imitations of the pupae fished during a
hatch are usually very effective. Pupae imitations may be fished weighted, near
the bottom during the early part of the hatch. When the hatch begins, imitations
can be fished wet imitating the pupa swimming to the surface to hatch. Imitations
of the emerging pupae are also effective when they are allowed to dead drift just
underneath the surface. This is usually the best method to use.
As we said in the larva section, they hatch when the water temperature is
between 45 and 50 degrees. They will emerge anywhere in the stream in
moderately flowing water.
These flies normally hatch from mid-day to late afternoon, depending on the
weather. Before the hatch ends, the females from previous hatches will begin to
deposit their eggs, so it is often that the egg laying and emerging process
occurs late in the afternoon at the same time.  I mention this here (in the pupae
section) because during this time it is difficult to determine what the best method
of fishing is - imitating the emerging pupae or imitating the egg layers. Most of
the time, you are better off sticking with the emerging pupae at least until the
time the hatch begins to slow down.
Adults:                      
Dry fly imitations of the newly hatched adults will also catch trout if the conditions
are right. By that I mean if the water temperature is around 50 degrees or better.
However, the adult imitations are generally not as effective as the pupae
imitations.
The adult
Brachycentrus numerosus caddis has a greenish brown colored body
with dark brown wings. They are so dark that they appear black. These are
usually imitated using a hook size 16 or 18 fly. The males are the smaller 18
hook size and of course the females the larger 16 hook size. As I said, when
they hatch it is very possible to catch trout on dry fly imitations of the adults.
Sometimes they float on the water a long time before flying away. This is
especially true when the weather turns cold (air not the water) and the hatch
subsides. They are large enough and visible enough for you to see them on the
water if you watch carefully. This can result in some excellent dry fly fishing. If
you try the dry fly and it doesn't work, switch back to the pupa imitation.

Coming Up Next:
Fishing the Egg-Laying Little Black Caddis

Copyright 2008 James Marsh