Nannostomus mortenthaleri
CR

Nannostomus mortenthaleri

Declining

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

Overview

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

Nannostomus mortenthaleri faces severe threats from deforestation and agricultural expansion in its restricted range within the Peruvian Amazon. Mining activities and water pollution from agricultural runoff further degrade the pristine blackwater and clearwater streams this species requires. The extremely limited geographic distribution makes the entire population vulnerable to localized environmental changes or habitat destruction.

Threat summary

Habitat

This pencilfish inhabits slow-moving blackwater and clearwater streams in pristine rainforest areas of the Peruvian Amazon basin. It prefers shallow, heavily vegetated waters with soft substrates and abundant aquatic plants that provide cover and foraging opportunities.

FRESHWATER· major

Conservation measures underway

Species recovery

Other threatened species in LEBIASINIDAE

VU

Lebiasina boruca

Unknown
VU

Lebiasina marilynae

Unknown
VU

Lebiasina ardilai

Unknown
VU

Lebiasina provenzanoi

Unknown

Threatened in Peru

EN

Puya fastuosa

Unknown
EN

Puya pratensis

Unknown
CR

Puya ramonii

Unknown
VU

Copper Shark

Carcharhinus brachyurus

Declining

Frequently asked questions

Why is Nannostomus mortenthaleri classified as Critically Endangered?
Nannostomus mortenthaleri 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. Nannostomus mortenthaleri faces severe threats from deforestation and agricultural expansion in its restricted range within the Peruvian Amazon. Mining activities and water pollution from agricultural runoff further degrade the pristine blackwater and clearwater streams this species requires. The extremely limited geographic distribution makes the entire population vulnerable to localized environmental changes or habitat destruction.
Where does Nannostomus mortenthaleri live?
Nannostomus mortenthaleri occurs in Peru. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Nannostomus mortenthaleri?
The main threats to Nannostomus mortenthaleri 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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