.......................  ....................  ...Fly Fishing Yellowstone National Park
08/13/12
New KISS Bug Series - Part 57

Little Sister Caddisfly
Introduction









I'm guilty of not placing enough emphasis on the Little Sister Caddisflies as I should. I guess because they
are similar to the Spotted Sedges and the eastern Cinnamon Sedges, I just tend to think everyone knows
what they need to know about them. Now, I'm well aware that there isn't a tailwater inside Yellowstone
National Park, at least not a man made one - there some built by the beavers, but the Little Sisters are
probably the most important caddisfly there is in tailwaters coast to coast. That isn't to say they are not
plentiful in freestone streams and spring creeks because they are. They exist in every stream we have
observed samples from inside the park. Now before anyone jumps on me, please be aware that we have
never removed any insects from the park, I'm strictly referring to streamside observations and video/photos
taken.

I first become aware of them in the park several years ago when I couldn't catch trout feeding on them in
the Gibbons River. I didn't know what they were at the time. All I knew was trout were feeding on caddisflies
in the ends of the pools just prior to dark and I wasn't able to hook them. I did notice they were much
smaller than the normal Spotted Sedges. Once I noticed the give away green color of their body, I figured it
out. All I had at the time was a size 18 Elk Hair Caddis in various colors but none with the bright green body
of the Little Sisters. I finally hooked some brown trout the next afternoon using the smaller size imitation.

There are many species of the
cheumatopsyche genus that are commonly called Little Sisters. Of course
the little sister name came from the fact they are similar to the larger Spotted Sedges and Cinnamon
caddisflies of the
hydropsyche and ceratopsyche respectively. They are all net-spinning caddisflies. These
are hatching at the present time in many streams inside the park as well as many streams outside the park
in the greater Yellowstone area.

Imitations of the larva, pupa and adult stages of this little caddisfly will catch trout. I will get into how we fish
our imitations of these stages in the forthcoming articles.
Copyright 2012 James Marsh
Little Sister Caddis
Species:                             
Type:                                  
Availability to trout:             
Hook Size:                          
Numbers:                            
Distribution:                        
Type of water:                    
Emergence time:                
Duration of hatch period:

Hydropsychidae cheumatopsyche
Net-spinning
Excellent
18
Moderate
Throughout the park in most all streams
Moderate to slow
Late afternoons
2 weeks to a month