VU

Mariano

Rhinodoras thomersoni

Unknown

Overview

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

The Mariano faces severe pressure from dam construction and river channelization throughout the Magdalena River basin, which fragments its habitat and disrupts spawning migrations. Overfishing using destructive methods like dynamite and fine-mesh nets has significantly reduced population numbers, while agricultural runoff and urban pollution degrade water quality in its remaining habitat.

Threat summary

Habitat

This large catfish inhabits the main channels and tributaries of the Magdalena River system in Colombia, preferring deep pools and rocky substrates in medium to large rivers. It requires free-flowing waters for spawning migrations and is particularly dependent on specific spawning grounds in the upper reaches of river systems.

FRESHWATER· major

Other threatened species in Doradidae

VU

Sierra mariano

Doraops zuloagai

Unknown

Threatened in Colombia

VU

Styrax duidae

Declining
EN

Pseudoplatystoma magdaleniatum

Declining
EN

Hyloscirtus japreria

Declining
VU

Freziera golondrinensis

Unknown

Frequently asked questions

Why is Mariano classified as Vulnerable?
Mariano is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. The Mariano faces severe pressure from dam construction and river channelization throughout the Magdalena River basin, which fragments its habitat and disrupts spawning migrations. Overfishing using destructive methods like dynamite and fine-mesh nets has significantly reduced population numbers, while agricultural runoff and urban pollution degrade water quality in its remaining habitat.
Where does Mariano live?
Mariano occurs in Colombia, and Venezuela. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Mariano?
The main threats to Mariano 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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