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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Sunlight Creek in Wyoming

Stream photos

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Ephemerella mucronata Mayfly NymphEphemerella mucronata Mayfly Nymph
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.
17 Recently Added Photos
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.
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  1. Trout, Salmon, and Grayling Streams
    2. ›
  2. Alaska
    3. ›
  3. The Copper River

  1. Trout, Salmon, and Grayling Streams
    2. ›
  2. Alaska
    3. ›
  3. The Copper River

Landscape & scenery photos from the Copper River

This is the delta where O'Brien Creek flows out into the Copper River's channel. It may be one of the most intense graveyards for filleted salmon in the world. From the Copper River in Alaska
I was at a popular spot for dipnetting, and this little rodent (a vole, I think?) hit the jackpot with an earlier angler's leftover snack. From the Copper River in Alaska
Seagulls rest on a gravel bar across from the fish cleaning station at O'Brien Creek, in between meals. From the Copper River in Alaska
The Copper River is often over a mile wide, but the dipnetting almost all takes place in this narrow canyon below the confluence with the Chitina River. Here the river squeezes into a deep, fast, turbulent rapids that funnels fish through a narrow area and forces them to hug the banks where anglers can reach them. From the Copper River in Alaska
The Copper River in Alaska
An anonymous dipnetter works the bank near the access point at O'Brien Creek. From the Copper River in Alaska
I spent twelve hours holding this net in the river, often in fast current. The key is to hold it in an eddy, so it billows out upstream and can catch the salmon that are all swimming in that direction. The eddies along the bank attract salmon because it's easier for them to run upstream with the current than against it. The best eddies are the narrow ones where the rest of the river is flowing fast downstream most of the salmon hug the bank. From the Copper River in Alaska

References

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