Lisbon arched-mouth nase
CR

Lisbon arched-mouth nase

Iberochondrostoma olisiponensis

Unknown

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

Overview

Iberochondrostoma olisiponense, the Lisbon arched-mouth nase, is a species of freshwater ray-finned fish belonging to the family Leuciscidae. This species was discovered in 2007 in the lower Rio Tejo basin, Portugal.

The Lisbon arched-mouth nase faces severe threats from habitat degradation and water pollution in its limited range within Portuguese river systems. Dam construction and water extraction have fragmented populations and altered natural flow regimes, while agricultural runoff and urban pollution have degraded water quality in critical spawning and feeding areas.

Threat summary

Habitat

This species is endemic to the lower Rio Tejo basin. It was only found in three tributaries of the Tejo River, namely, Trancão, Maior, and Muge.

FRESHWATER· major

Other threatened species in Cyprinidae

Iberian-RoachVU

Iberian-Roach

Squalius alburnoides

Unknown
French naseVU

French nase

Parachondrostoma toxostoma

Unknown
VU

Menderes barbel

Luciobarbus kottelati

Unknown
Ohrid spirlinVU

Ohrid spirlin

Alburnoides ohridanus

Unknown

Frequently asked questions

Why is Lisbon arched-mouth nase classified as Critically Endangered?
Lisbon 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 Lisbon arched-mouth nase faces severe threats from habitat degradation and water pollution in its limited range within Portuguese river systems. Dam construction and water extraction have fragmented populations and altered natural flow regimes, while agricultural runoff and urban pollution have degraded water quality in critical spawning and feeding areas.
Where does Lisbon arched-mouth nase live?
Lisbon arched-mouth nase occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Lisbon arched-mouth nase?
The main threats to Lisbon 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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