Western Ruivaco
CR

Western Ruivaco

Achondrostoma occidentale

DecliningENEUENEU

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Achondrostoma_occidentale

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Achondrostoma occidentale faces severe population decline due to habitat degradation from dam construction and water extraction in Portuguese river systems. The species is particularly vulnerable to pollution from agricultural runoff and urban development, which degrades water quality in its limited range. Competition and hybridization with introduced non-native fish species further threatens the genetic integrity of remaining populations.

Threat summary

Habitat

This endemic Portuguese cyprinid inhabits clear, well-oxygenated rivers and streams in the western Atlantic coastal drainages. The species prefers areas with rocky or gravel substrates and moderate water flow, typically found in small to medium-sized watercourses.

FRESHWATER· major

Conservation measures underway

Habitat & natural process restorationEx-situ conservationLegislation

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Frequently asked questions

Why is Western Ruivaco classified as Critically Endangered?
Western Ruivaco is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Achondrostoma occidentale faces severe population decline due to habitat degradation from dam construction and water extraction in Portuguese river systems. The species is particularly vulnerable to pollution from agricultural runoff and urban development, which degrades water quality in its limited range. Competition and hybridization with introduced non-native fish species further threatens the genetic integrity of remaining populations.
Where does Western Ruivaco live?
Western Ruivaco occurs in Portugal. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Western Ruivaco?
The main threats to Western Ruivaco are 1.1, 11.1, 11.2, and 2.1. The full IUCN-classified threat record for this species is detailed on the species page.

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