Caddisflies
Gammarids
The Gave d'Oloron carried the principal wealth of Atlantic salmon to France — the water that shaped French salmon culture for generations. Salmon fishing here is closed. The 2026 Adour-Gaves decree ended it, and what the river offers now is trout and its own considerable company. It flows from the Pyrenean limestone with the composure of a river that knows its station, clearing quickly after rain. Brown trout inhabit the headwaters and tributary basins with elegant indifference; they feed best where the gradient steepens and the water speaks quickly over gravel. Sea trout enter the lower river in their season and remain fishable under the departmental arrêté. The limestone ensures colour clears swiftly, a courtesy to those who know how to read it. Check the current AAPPMA rules before fishing.
The March opening brings a short early-season emergence, typically active from around 13:00-15:00 — Fédération de Pêche des Pyrénées-Atlantiques reports have recorded unidentified surface insects, occasional large brown mayflies where winter floods haven't scoured the macrofauna, and a chance of late-afternoon chironomids, though none of these are confirmed as a dependable annual event. OFB station monitoring upstream of the Gave d'Oloron confirms a genuinely diverse caddis and mayfly fauna (Baetis, Ephemera, Ecdyonurus, Heptagenia and more) is present, but gives no emergence timing of its own.
- Limestone