bermejuela
Achondrostoma arcasii
Achondrostoma arcasii, termed the bermejuela, is a species of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces. Eurasian minnows and related fishes.
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Countries
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Achondrostoma_arcasii
Taxonomy & Classification
Kingdom
Animalia
Phylum
Chordata
Order
Cypriniformes
Family
Cyprinidae
Genus
Achondrostoma
bermejuela belongs to the family Cyprinidae, order Cypriniformes, within the unknown class.
Species Profile
Achondrostoma arcasii, termed the bermejuela, is a species of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces. Eurasian minnows and related fishes. This species is endemic to the northern Iberian Peninsula.
The bermejuela faces significant threats from habitat degradation and water pollution in its native river systems across the Iberian Peninsula. Dam construction and water extraction have fragmented populations and altered natural flow regimes, while agricultural runoff and urban pollution continue to degrade water quality in critical spawning and feeding areas.
Key Facts
Habitat & Distribution
Endemic to clear, well-oxygenated rivers and streams in the Duero and Tagus river basins of the Iberian Peninsula. Prefers rocky substrates and moderate to fast-flowing waters with abundant vegetation cover.
Threats
Dam construction and river fragmentation
Water extraction and flow alteration
Agricultural pollution and runoff
Habitat degradation from channelization
Urban wastewater discharge
National vs Global Threat Status
How this species is assessed at the national level compared to its IUCN global status (VU).
| Country | National Status | Global Status | Comparison |
|---|---|---|---|
| EU | VUVulnerable | VUVulnerable | Same |
| EU | VUVulnerable | VUVulnerable | Same |
National Red List data sourced from the National Red List Project (nationalredlist.org, ZSL) and country-specific Red List authorities.
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
National Red Lists: ZSL (2025). National Red List. Zoological Society of London. Available at: https://www.nationalredlist.org
This page: SpeciesRadar (2025). bermejuela (Achondrostoma arcasii). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/bermejuela