CR

Patzcuaro Allotoca

Allotoca diazi

Declining

Overview

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

Allotoca diazi faces severe population decline primarily due to habitat degradation and water pollution in its native Mexican freshwater systems. The species has experienced dramatic range reduction, with several historical populations now extinct due to urban development and agricultural runoff contaminating its spring-fed habitats. Introduction of non-native fish species has further compromised remaining populations through competition and predation pressure.

Threat summary

Habitat

This endemic Mexican goodeid inhabits clear, spring-fed freshwater systems in the Lerma River basin of central Mexico. The species requires well-oxygenated waters with stable temperatures and abundant aquatic vegetation, typically found in natural springs and their associated streams at elevations between 1,800-2,200 meters.

Artificial - Aquatic & marine· majorWetlands (inland)· majorWetlands (inland) - Permanent freshwater lakes· majorMarine neritic· major

Conservation measures underway

Species recoveryEx-situ conservation

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Frequently asked questions

Why is Patzcuaro Allotoca classified as Critically Endangered?
Patzcuaro Allotoca 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. Allotoca diazi faces severe population decline primarily due to habitat degradation and water pollution in its native Mexican freshwater systems. The species has experienced dramatic range reduction, with several historical populations now extinct due to urban development and agricultural runoff contaminating its spring-fed habitats. Introduction of non-native fish species has further compromised remaining populations through competition and predation pressure.
Where does Patzcuaro Allotoca live?
Patzcuaro Allotoca occurs in Mexico. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Patzcuaro Allotoca?
The main threats to Patzcuaro Allotoca are 1.1, 2.1, 2.3, and 6.1. The full IUCN-classified threat record for this species is detailed on the species page.

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