Stoneflies
Gammarids
A southern Ulla tributary draining the Deza valley between Lalín and Silleda. Heritage salmon tributary — salmon fishing banned in Galicia 2026 — but a steady wild brown trout and reo river in its own right. The middle reaches around Trasdeza and the Deza forest hold the most interest, with classic Galician granite freestone structure and partial canopy keeping summer water temperatures manageable.
Hatches & food
In Galicia's Atlantic trout rivers, resident browns feed through a spring build-up of olives and other up-wings into a long summer of caddis and small buzzers, with frequent spates and cool water keeping fish active; terrestrials from lush banks and meadows become important once levels settle and the banks green up.
- Granite