Insect Encyclopedia
Grannom
Brachycentrus occidentalis
Brachycentridae
CaddisflyHook #14-1610-14 mm body
Peak activity
JanFebMarAprMayJunJulAugSepOctNovDec
Larva
Four-sided case of vegetation; net-spinning in runs.
Adult
Dark olive body; tent wings.
Habitat & hatch
Found in rivers, tailwaters, and lake littoral zones, most commonly in riffles, runs, and bank. Larvae on bottom or in vegetation; adults on surface. Heavy afternoon hatches mid-April through May; adults on the surface.
Timing
Individual emergence windows typically last 14 to 30 days. Strongest surface activity occurs around the evening, and dusk.
Sources
- AB Fish Report synthesis from peer-reviewed Alberta and western North America literature.