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🌊 Marine Endangered 🌡️ Deep-water

Japanese spurdog

Squalus japonicus Ishikawa, 1908
Max Length
91 cm
Max Weight
-
Lifespan
-
Trophic Level
4.1
Depth
150–300 m
Climate
Deep-water
Resilience
Low
Vulnerability
65.00/100
Typical Length
-
Depth Zone
deep-water

📖 Overview

Found on the outer continental and insular shelves and uppermost slopes, presumably on or near sandy-mud bottom . Ovoviviparous .

Scientific Name
Squalus japonicus
Authority
Ishikawa, 1908
Habitat
Marine
Climate
Deep-water
Body Shape
Elongated
IUCN Status
EN
Max Length
91 cm
Depth Range
150–300 m
Trophic Level
4.1
Resilience
Low
Vulnerability
65.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 2; Anal spines: 0. : elongated.

🌀 Behaviour

Behavioural data for Japanese spurdog is currently being reviewed.

🦐 Diet

small fish
crustaceans
cephalopods

🥚 Reproduction

🐣 Viviparous 📦 Batch Spawner 🤰 Viviparous
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
Internal

Distinct pairing with embrace .

🌍 Habitat & Distribution

Marine; pelagic-oceanic; depth range 150 - 300 m . Deep-water; 41°N - 5°N East China Sea, including the Republic of Korea, the Philippines, and the Arafura Sea (Ref.

🌿 Ecology

Zone Preferences
🌊 Marine 🌑 Deep Water 🐟 Pelagic
Trophic Level
4.1±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00355 × L3.09 (TL)
Max TL
91cm
Dorsal Spines
2

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Endangered
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
65.00/100
High vulnerability
Trophic Level
4.1
Apex / Top predator
Body Shape
Elongated
Climate Zone
Deep-water
Described By
Ishikawa, 1908

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