Learn/Fly Box/Nymph/Alder Beetle Nymph
AB
Nymph

Alder Beetle Nymph

Alder beetle larva nymph
TroutSubsurface

A working imitation of the alder beetle larva — the meaty morsel that lives in the gravels and roots where Asturian riverside alders meet the water. Spanish tier's close reading of what the trout were actually taking.

Fish this when

Spring and early summer on Asturian rivers. Fish it tight to the bank under the alder roots where these larvae actually live, in the slack water.

Why it works

Specific imitations work when trout feed selectively on a single prey. Alder beetle larvae are large and abundant under Asturian alders — exact match beats generic nymph.

Naturals it imitates
alder beetle larva (Sialis lutaria)
Typical zone & fishable range
usually
Surface
Film
Subsurface
Deep
Setup sensitivity: medium
Hook range#12–16
Quick facts
Tying difficulty
Intermediate
Buy or tie?