Portugese Arched-Mouth Nase
CR

Portugese Arched-Mouth Nase

Iberochondrostoma lusitanicum

Unknown

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

Overview

Iberochondrostoma lusitanicum, or the boga-portuguesa or Portuguese arched-mouth nase, is a species of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces, minnows and related fishes. This species is endemic to Portugal.

The Portuguese nase faces severe threats from habitat degradation and fragmentation of its freshwater river systems. Dam construction, water extraction, and pollution have significantly reduced suitable habitat and isolated populations, while invasive species compete for resources and alter ecosystem dynamics.

Threat summary

Habitat

Endemic to freshwater river systems in Portugal, particularly the Tagus and Sado river basins. Inhabits clear, flowing waters with rocky or gravel substrates in both main river channels and tributaries.

FRESHWATER· major

Other threatened species in Cyprinidae

VU

Garra compressus

Unknown
Ohrid spirlinVU

Ohrid spirlin

Alburnoides ohridanus

Unknown
Eastern Iberian ChubVU

Eastern Iberian Chub

Squalius valentinus

Unknown
Iberian arched-mouth naseVU

Iberian arched-mouth nase

Iberochondrostoma lemmingii

Unknown

Threatened in Portugal

VU

Lepiota echinella

Unknown
CR

Coscinodon monchiquensis

Unknown
EN

Double Spleenwort

Asplenium anceps

Declining
VU

Madeira Rustyback Fern

Asplenium lolegnamense

Declining

Frequently asked questions

Why is Portugese Arched-Mouth Nase classified as Critically Endangered?
Portugese Arched-Mouth Nase 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. The Portuguese nase faces severe threats from habitat degradation and fragmentation of its freshwater river systems. Dam construction, water extraction, and pollution have significantly reduced suitable habitat and isolated populations, while invasive species compete for resources and alter ecosystem dynamics.
Where does Portugese Arched-Mouth Nase live?
Portugese Arched-Mouth Nase 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 Portugese Arched-Mouth Nase?
The main threats to Portugese Arched-Mouth Nase are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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