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💧 Freshwater 🌡️ Subtropical

Biwa salmon

Oncorhynchus biwaensis Fujioka, Kuwahara, Tabata, Fuke & Nakabo, 2025
Max Length
24.1 cm
Max Weight
-
Lifespan
-
Trophic Level
3.6
Depth
40–90 m
Climate
Subtropical
Resilience
Medium
Vulnerability
37.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Overview information for Biwa salmon is currently being compiled by our editorial team.

Scientific Name
Oncorhynchus biwaensis
Authority
Fujioka, Kuwahara, Tabata, Fuke & Nakabo, 2025
Habitat
Freshwater
Climate
Subtropical
Body Shape
Elongated
Max Length
24.1 cm
Depth Range
40–90 m
Trophic Level
3.6
Resilience
Medium
Vulnerability
37.00/100
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal soft rays (total): 14; Anal soft rays: 11 - 14. This species is distinguished from its congeners by the following set of characters: dorsal, anal, pectoral and pelvic fin-rays [14 (mode 14), 11-14 (13), 13-14 (14) and 9 (9), respectively]; scales above and below lateral line [19-22 (21) and 21-24 (24), respectively)]; 43-65 (56) pyloric caeca; 0-15 (0) red spots laterally on body less than ca. 20 cm SL; body particularly slender in immature juveniles, body depth 20.9-26.7% of SL (average 23.3%); snout short, moderately pointed, length 5.5-7.0% of SL (6.2%); eye small, diameter 4.2-6.3% of SL (5.2%); interorbit narrow, width 6.7-8.0% of SL (7.4%); scales oblong, length/width ratio 1.26-1.64 (1.48); focus slightly forward of center, length of apical area/ length of basal area 0.99-1.45 (1.21); ridges circular, not disappearing in apical area (Ref 138051).: elongated; Cross section: compressed.

🌀 Behaviour

Behavioural data for Biwa salmon is currently being reviewed.

🦐 Diet

Diet information for Biwa salmon is currently being compiled.

🥚 Reproduction

Reproduction data for Biwa salmon is currently being compiled.

🌍 Habitat & Distribution

Freshwater; benthopelagic; depth range 40 - 90 m . Subtropical

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
3.6±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00457 × L3.1 (TL)
Max TL
24.1cm
Dorsal Rays
14
Anal Rays
13

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
37.00/100
Moderate vulnerability
Trophic Level
3.6
Predator
Body Shape
Elongated
Climate Zone
Subtropical
Described By
Fujioka, Kuwahara, Tabata, Fuke & Nakabo, 2025

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