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💧 Freshwater Critically Endangered 🌡️ Subtropical

Formosan landlocked salmon

Oncorhynchus formosanus Jordan & Oshima, 1919
Max Length
57 cm
Max Weight
-
Lifespan
5 yrs
Trophic Level
3.2
Depth
-
Climate
Subtropical
Resilience
Low
Vulnerability
28.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Formosan landlocked salmon (Oncorhynchus formosanus), first described by Jordan & Oshima, 1919 is a large fish in the family Salmonidae (order Salmoniformes). Adults typically reach 57.00 cm in maximum length. Reported lifespan reaches approximately 5 years. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Subtropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Critically Endangered.

Scientific Name
Oncorhynchus formosanus
Authority
Jordan & Oshima, 1919
Habitat
Freshwater
Climate
Subtropical
Body Shape
Fusiform / normal
IUCN Status
CR
Max Length
57 cm
Lifespan
5 years
Trophic Level
3.2
Resilience
Low
Vulnerability
28.00/100
Migration
Non-migratory
Salinity
0–0.5 ppt

🐟 Physical Description

This species possess 9 oval cloudily speckles along lateral midline of body and 11-13 small black spots above lateral line ..: fusiform / normal.

🌀 Behaviour

Behavioural data for Formosan landlocked salmon is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 🪺 Nest Builder 🛡️ Egg Guarder
Spawning Season
spring
Spawn Location
Nest
Fertilization
External

Reproductive strategy: synchronous ovarian organization, determinate fecundity . Nests are built by females .

🌍 Habitat & Distribution

Freshwater; demersal; non-migratory . Subtropical endemic to Taiwan.

🌿 Ecology

Zone Preferences
💧 Freshwater ⬇️ Benthic
Migration
Non-migratory
Trophic Level
3.2±0.4
Food Items

insects

📐 Morphometrics

Length–Weight Relationship: W = 0.01047 × L3.04 (TL)
Max TL
57cm

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
1996

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
28.00/100
Low vulnerability
Trophic Level
3.2
Predator
Body Shape
Fusiform / normal
Climate Zone
Subtropical
Described By
Jordan & Oshima, 1919

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