Nymph
Isonychia Nymph
Bank-crawling fast swimmer
Trout · GraylingSubsurface
Streamlined fast-swimming nymph of the Slate Drake (Isonychia) — crawls to the bank to emerge, so the nymph is the key stage.
Fish this when
In late summer on faster eastern freestone rivers, dead-drifted or swung tight to the bank and structure as naturals migrate toward the margins.
Why it works
Isonychia nymphs crawl out to the bank rather than hatching mid-river, so fishing tight to the edge puts the fly exactly where the naturals are concentrating, whether or not anything is rising.
Naturals it imitates
Slate Drake / Isonychia swimmer nymph
Typical zone & fishable range
usually
Surface
Film
Subsurface
Deep
Setup sensitivity: medium
Quick facts
Tying difficulty
Intermediate