Gammarids
Across its 59 km the middle and upper river hold good numbers of wild brown trout, and salmon no longer run here. Mixed geology gives good water quality and varied substrate, and the river responds to rain within about four hours. The season runs from 1 April to 31 July; the no-kill stretch from the old Zestoa spa bridge up to the Loiola sanctuary bridge stays open to 30 September. April and May are the best months.
In the steep, often pressured Atlantic rivers of the Basque Country, trout opportunities centre on spring olives and other up-wings when flows and colour briefly line up, with caddis and buzzers helping to sustain sport into early and mid-summer, and terrestrials from grassy, wooded margins adding surface food in quieter, recovering reaches.
- Mixed