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FISH GUIDE · Freshwater

Northern Iberian chub: identification, habitat and fishing guide

Squalius carolitertii

Iberian river fish with a subterminal mouth.

Catalogue names : Northern Iberian chub. 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

Several northwestern Iberian drainages, including the Douro, Mondego and Miño.

  • Documented presence : Douro, Mondego and Miño drainages

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

Rounded snout, subterminal mouth; confirm using a key to Iberian Squalius.

Habitat

Hill streams and middle river reaches.

Diet

Omnivorous juveniles; adults mainly arthropods and other animals.

Behaviour

The MNCN synthesis describes it as essentially resident, without seasonal movements.

Indicative biological size

13.6 cm common standard length according to FishBase, excluding the tail.

Fishing context and precautions

The TIRM 2025/2026 framework prohibits fishing for escalo, named Squalius carolitertii in its official table. This international Miño example covers identification and prevention, without targeting. Rules for an ordinary Portuguese fishing ground do not replace this cross-border regime.

Edital 1103/2026, published in September, enters into force on 1 November 2026. For an encounter from that date, check the new text; this reading does not presume the contents of its taxon-specific table.

A distinctive feature

Studies show its vulnerability to heat stress compared with other, more Mediterranean Iberian Squalius.

Sources and review

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

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