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FISH GUIDE · Freshwater

Northern straight-mouth nase: identification, habitat and fishing guide

Pseudochondrostoma duriense

Schooling river fish of northwestern Iberia.

Catalogue names : Northern straight-mouth nase. Forms and names may vary between habitats.

Editorial review : · This species guide is not permission to fish. Read the precautions below and check the current rules for your location before targeting a species. Some species or populations are protected.

Geographical distribution

Northwestern Iberia, from the Douro drainage to Galician river systems.

  • Documented presence : Douro drainage and river systems towards Galicia

Documented areas, not an exhaustive list. Presence in a region does not imply presence in every water body or permission to fish.

Distribution sources

Identification

Downturned mouth, without barbels; the lower lip has an almost straight horny blade. The Castile and León account describes frequent small black spots without treating them as a sufficient diagnosis; confirm using a key to the genus.

Habitat

Flowing middle reaches of rivers.

Diet

Plant material, small invertebrates and detritus.

Behaviour

Schooling, particularly during spawning migration.

Fishing context and precautions

In Portugal’s rio Âncora ZPL, the ICNF 2026 notice prohibits fishing for Pseudochondrostoma duriense to restore its populations and requires its return. This prevention scope adopts neither the old Eria nymph-fishing account nor a method for another boga.

A distinctive feature

Hybrids with Achondrostoma are described; some closely resemble this species.

Sources and review

Each reference includes its access date. Overall editorial review: . Local conditions and regulations may change.

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