Sakhalin Taimen
CR

Sakhalin Taimen

Parahucho perryi

Declining

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

Overview

The Sakhalin taimen, also known as the Japanese huchen or stringfish, is a large species of salmonid freshwater fish in Northeast Asia, found in the lakes and large rivers of Primorsky, Khabarovsk, Sakhalin and Kuril Islands of Far Eastern Russia, as well as Hokkaido of Japan. Although often placed in the genus Hucho, molecular phylogenetic and other evidence has shown that it belongs in its own monotypic genus Parahucho.

Parahucho perryi faces severe population decline primarily due to dam construction and river modification throughout its range, which fragments populations and blocks critical spawning migrations. Overfishing has historically depleted stocks, while climate change increasingly affects water temperatures and flow patterns essential for successful reproduction. Habitat degradation from logging, agriculture, and urban development continues to reduce the quality of riparian zones and spawning grounds.

Threat summary

Habitat

Parahucho perryi inhabits cold, fast-flowing rivers and streams in the North Pacific region, particularly in Russia, Japan, Korea, and northeastern China. The species requires pristine freshwater systems with gravel beds for spawning and may migrate to coastal waters during certain life stages.

Marine coastal/supratidal· majorWetlands (inland)· majorWetlands (inland) - Permanent rivers/streams· majorWetlands (inland) - Permanent freshwater lakes· majorMarine neritic· major

Conservation measures underway

Site/area protectionHabitat & natural process restorationSpecies recoveryEx-situ conservationAwareness & communicationsCompliance and enforcement

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Frequently asked questions

Why is Sakhalin Taimen classified as Critically Endangered?
Sakhalin Taimen 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. Parahucho perryi faces severe population decline primarily due to dam construction and river modification throughout its range, which fragments populations and blocks critical spawning migrations. Overfishing has historically depleted stocks, while climate change increasingly affects water temperatures and flow patterns essential for successful reproduction. Habitat degradation from logging, agriculture, and urban development continues to reduce the quality of riparian zones and spawning grounds.
Where does Sakhalin Taimen live?
Sakhalin Taimen occurs in Canada, Japan, Russia, and South Korea. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Sakhalin Taimen?
The main threats to Sakhalin Taimen are 1.1, 2.1, 4.1, and 5.1. The full IUCN-classified threat record for this species is detailed on the species page.

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