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🌊 Marine Endangered ⚠️ Venomous ⚡ Traumatogenic 🌡️ Deep-water

Taiwan angleshark

Squatina formosa Shen & Ting, 1972
Max Length
55.4 cm
Max Weight
-
Lifespan
-
Trophic Level
3.8
Depth
183–220 m
Climate
Deep-water
Resilience
Low
Vulnerability
42.00/100
Typical Length
-
Depth Zone
deep-water

📖 Overview

Taiwan angleshark (Squatina formosa), first described by Shen & Ting, 1972 is a large fish in the family Squatinidae (order Squatiniformes). Adults typically reach 55.40 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 183 to 220 metres. It occurs in Deep-water waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Endangered.The species is venomous and potentially dangerous to handle and a species of conservation concern.

Scientific Name
Squatina formosa
Authority
Shen & Ting, 1972
Habitat
Marine
Climate
Deep-water
Body Shape
Other
IUCN Status
EN
Max Length
55.4 cm
Depth Range
183–220 m
Trophic Level
3.8
Resilience
Low
Vulnerability
42.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 0. Taiwan angelshark Squatina formosa has broad pectoral fins with outer corner more obtuse and free rear tips narrowly subangular; nasal barbels apparently simple, narrow and tapered. Anterior nasal flaps smooth to weakly fringed; dermal folds on sides of head possibly with a triangular lobe. Rear tip of inner margin of pelvic fins reaching little beyond origin of first dorsal. Very short hypocercal tail. Rows of small spines on midline of back and tail, and on snout and between eyes. Color: no ocelli (eye-like spot) on body .: other.

🌀 Behaviour

Behavioural data for Taiwan angleshark is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Ovoviviparous

Ovoviviparous, embryos feed solely on yolk .

🌍 Habitat & Distribution

Marine; bathydemersal; depth range 183 - 220 m . Deep-water; 24°N - 22°N, 120°E - 121°E North Western Pacific: East coast of Taiwan and Ryuku Islands to SE Japan to Izu Peninsula (Ref.

🌿 Ecology

Zone Preferences
🌊 Marine 🌑 Deep Water
Trophic Level
3.8±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00661 × L3.07 (TL)
Max TL
55.4cm

🌡️ 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
42.00/100
Moderate vulnerability
Trophic Level
3.8
Predator
Body Shape
Other
Climate Zone
Deep-water
Described By
Shen & Ting, 1972

⚠️ Venom Profile

Medical Warning: This species is venomous. Seek immediate medical attention if envenomated. Contact emergency services and follow first aid guidance below.
Venom Type
proteinaceous neurotoxin
Delivery
dorsal, anal, and pelvic fin spines
Potency
Severe
Mortality Risk
Low
Symptom Onset
5min
Duration
24.0hrs
Antivenom
✗ Not Available
Named Toxins
high-molecular-weight protein (Stonustoxin analogue) acetylcholine
Symptoms
  • immediate intense pain
  • swelling
  • erythema
  • occasional nausea and weakness
Affected Body Systems
peripheral nervous system cardiovascular
First Aid
Immerse affected area in hot water (45 C, tolerable) for 30-90 minutes to denature toxin. Do not apply ice.
Medical Treatment

Analgesia; wound care; tetanus prophylaxis; severe cases may require monitoring for systemic effects.

References: Compiled from Bhide (2018), Halstead et al. (1988) and family-specific envenomation literature

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .

Occurrence density from GBIF View GBIF records ↗

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