Lisbon arched-mouth nase
Iberochondrostoma olisiponensis
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.
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Iberochondrostoma_olisiponense
Taxonomy & Classification
Kingdom
Animalia
Phylum
Chordata
Order
Cypriniformes
Family
Cyprinidae
Genus
Iberochondrostoma
Lisbon arched-mouth nase belongs to the family Cyprinidae, order Cypriniformes, within the unknown class.
Species Profile
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.
Key Facts
Habitat & Distribution
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.
Threats
IUCN Red List: Critically Endangered
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.
Habitat fragmentation from dam construction
Urban development and water extraction
Water pollution from agricultural runoff
Altered river flow regimes
Small population size and genetic bottlenecks
Community Sightings
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Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
This page: SpeciesRadar (2025). Lisbon arched-mouth nase (Iberochondrostoma olisiponensis). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/lisbon-arched-mouth-nase