Header image
Enter a name
Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Caddisfly Species Brachycentrus americanus (American Grannoms)

Where & when

Time of year : July and August

This species is most prolific in the West and Midwest, but it may still be of concern to fishermen in the East.

In 80 records from GBIF, adults of this species have mostly been collected during July (31%), August (28%), June (16%), September (13%), and May (9%).

In 109 records from GBIF, this species has been collected at elevations ranging from 3 to 10007 ft, with an average (median) of 6099 ft.

Species Range

Hatching behavior

Time of day : Morning

Special thanks to Lloyd Gonzales, author of the excellent new book Fly-Fishing Pressured Water, for helping to sort out the Brachycentrus species and common names.

Specimens of the Caddisfly Species Brachycentrus americanus

1 Female Adult
2 Larvae

Discussions of Brachycentrus americanus

Brachycentrus americanus on the Lower Sacramento River California
Posted by Troutguide on Oct 29, 2016
Last reply on Oct 29, 2016 by Troutguide
I believe this is the species found in sometimes very large numbers on the Lower Sacramento River in the Redding area. Ten years ago it was present in such large numbers that fishing a fly on the bottom resulted in frequently hooking one of these caddis still in its case. Along with other aquatic insects their numbers have declined to a fraction of once seen. I don't believe the egg Sac dropped by the females to be olive , instread I have seen it to be a bright green. The females seem to oviposit close to the edge of flowing water and not midstream.

Start a Discussion of Brachycentrus americanus

References

Caddisfly Species Brachycentrus americanus (American Grannoms)

Taxonomy
Species Range
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy