Chignahuapan Silverside
CR

Chignahuapan Silverside

Poblana ferdebueni

Declining

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

Overview

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

Poblana ferdebueni faces severe threats from water extraction and pollution in its extremely limited range within the Lerma River system of central Mexico. Agricultural runoff and urban development have degraded water quality, while dam construction and water diversions have altered natural flow patterns. The species' restriction to a single watershed makes it exceptionally vulnerable to any environmental changes or catastrophic events.

Threat summary

Habitat

This endemic fish inhabits freshwater streams and rivers within the Lerma River basin in central Mexico. It requires clean, well-oxygenated waters with specific flow characteristics typical of highland Mexican river systems.

Marine coastal/supratidal· majorWetlands (inland) - Permanent freshwater lakes· major

Other threatened species in ATHERINIDAE

Alchichica SilversideCR

Alchichica Silverside

Poblana alchichica

Declining
Atherinomorus lineatusVU

Atherinomorus lineatus

Unknown
VU

Craterocephalus gloveri

Unknown
CR

Giant Hardyhead

Sashatherina gigantea

Unknown

Threatened in Mexico

EN

Turbinicarpus horripilus

Declining
CR

Turbinicarpus mandragora

Declining
EN

Opuntia pachyrrhiza

Declining
EN

Arachnothryx tacanensis

Declining

Frequently asked questions

Why is Chignahuapan Silverside classified as Critically Endangered?
Chignahuapan Silverside 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. Poblana ferdebueni faces severe threats from water extraction and pollution in its extremely limited range within the Lerma River system of central Mexico. Agricultural runoff and urban development have degraded water quality, while dam construction and water diversions have altered natural flow patterns. The species' restriction to a single watershed makes it exceptionally vulnerable to any environmental changes or catastrophic events.
Where does Chignahuapan Silverside live?
Chignahuapan Silverside 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 Chignahuapan Silverside?
The main threats to Chignahuapan Silverside are 5.3, 6.1, 7.3, and 8.1. The full IUCN-classified threat record for this species is detailed on the species page.

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