New 🐟 Mercury Safety Guide & Omega-3 Rankings Updated for 2026. View Omega-3 Rankings →

🌊 Marine Least Concern 🌡️ Temperate

Trapezoid torpedo

Tetronarce tokionis Tanaka, 1908
Max Length
69.3 cm
Max Weight
-
Lifespan
-
Trophic Level
4.2
Depth
220–1100 m
Climate
Temperate
Resilience
Very low
Vulnerability
64.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Inhabits shelf edges to about 1000 m . Ovoviviparous . Maturity size of males at ca. 68 cm TL; birth size at ca. 20 cm TL . Reported to be infrequently captured as by-catch, but of no commercial importance .

Scientific Name
Tetronarce tokionis
Authority
Tanaka, 1908
Habitat
Marine
Climate
Temperate
IUCN Status
LC
Max Length
69.3 cm
Depth Range
220–1100 m
Trophic Level
4.2
Resilience
Very low
Vulnerability
64.00/100
Salinity
30–40 ppt

🐟 Physical Description

Physical description for Trapezoid torpedo is currently being compiled.

🌀 Behaviour

Behavioural data for Trapezoid torpedo is currently being reviewed.

🦐 Diet

small fish
crustaceans
cephalopods

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures .

🌍 Habitat & Distribution

Marine; demersal; depth range 220 - 1100 m . Temperate; 42°N - 21°N, 119°E - 146°E Northwest Pacific: Japan and Taiwan.

🌿 Ecology

Zone Preferences
🌊 Marine ⬇️ Benthic
Trophic Level
4.2±0.6

📐 Morphometrics

Length–Weight Relationship: W = 0.01479 × L2.97 (TL)
Max TL
69.3cm

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Very low
Minimum doubling time
Fishing Vulnerability
64.00/100
High vulnerability
Trophic Level
4.2
Apex / Top predator
Climate Zone
Temperate
Described By
Tanaka, 1908

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet - be the first to log one!

View all observations for Trapezoid torpedo ↗
Suggest an Edit

Spotted incorrect or outdated data? Submit a correction and our editorial team will review it. Approved edits go live within 48 hours.

Link to a scientific paper, FishBase, or other authoritative source
Report an Issue

Found a factual error, broken data, or inappropriate content? Let us know and we will investigate promptly.