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Diadromous Least Concern ⚠️ Venomous ⚡ Venomous 🌡️ Tropical

Spotted scat

Scatophagus argus Linnaeus, 1766
Max Length
45 cm
Max Weight
-
Lifespan
-
Trophic Level
3
Depth
0–5 m
Climate
Tropical
Resilience
High
Vulnerability
20.00/100
Typical Length
20 cm
Depth Zone
demersal

📖 Overview

Adults inhabit harbors, natural embayments, brackish estuaries and the lower reaches of freshwater streams, frequently occurring among mangroves. They feed on worms, crustaceans, insects and plant matter . The dorsal, anal and pelvic spines are believed by Philippine fishers to be venomous and capable of inflicting wounds . Used in Chinese medicine . In Hong Kong live fish markets . Marketed as fresh .

Scientific Name
Scatophagus argus
Authority
Linnaeus, 1766
Habitat
Diadromous
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
LC
Max Length
45 cm
Depth Range
0–5 m
Latitude
33°S – 35°N
Trophic Level
3
Resilience
High
Vulnerability
20.00/100
Migration
Amphidromous
Water Temp
20–28 °C
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 10 - 11; Dorsal soft rays (total): 16 - 18; Anal spines: 4; Anal soft rays: 13 - 15. Ground colour greenish. Juveniles with a few large roundish blotches, about size of eye, or with about 5 or 6 broad, dark, vertical bars. In large adults, spots may be faint and restricted to dorsal part of flanks. Body quadrangular, strongly compressed. Dorsal head profile steep. Eye moderately large, its diameter somewhat smaller than snout length. Snout rounded. Mouth small, horizontal, not protractile. Teeth villiform, in several rows on jaws (ref 43044).: short and / or deep.

🌀 Behaviour

Behavioural data for Spotted scat is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

Multiple spawner .

🌍 Habitat & Distribution

Marine; freshwater; brackish; demersal; amphidromous ; depth range 0 - 5 m . Tropical; 20°C - 28°C ; 35°N - 33°S, 48°E - 171°W north to southern Japan, south to New Caledonia.

🌿 Ecology

Zone Preferences
🌊 Marine 💧 Freshwater 🌿 Brackish ⬇️ Benthic
Migration
Amphidromous
Trophic Level
3±0.35
Food Items

worms, crustaceans, insects and plant matter (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.03236 × L2.92 (TL)
Max TL
45cm
Dorsal Spines
11
Dorsal Rays
17
Anal Spines
4
Anal Rays
14

🌡️ Water Parameters & Tolerance

Temperature Range
20–28°C
Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2009

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
20.00/100
Low vulnerability
Trophic Level
3
Predator
Body Shape
Short and / or deep
Climate Zone
Tropical
Latitude Range
35°N – 33°S
Described By
Linnaeus, 1766

⚠️ 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

🌐 Names & Taxonomy

Scientific Synonyms

Scientific Name Author Year Status
Cacodoxus argus Linnaeus 1766 Synonym
Chaetodon argus Linnaeus 1766 Synonym
Chaetodon atromaculatus Bennett 1830 Synonym
Chaetodon pairatalis Hamilton 1822 Synonym
Ephippus argus Linnaeus 1766 Synonym
Sargus maculatus Gronow 1854 Heterotypic
Scatophagus aetatevarians De Vis 1884 Synonym
Scatophagus alternans Castelnau 1879 Synonym
Scatophagus argus argus Linnaeus 1766 Synonym
Scatophagus argus atromaculatus Bennett 1830 Synonym
Scatophagus argus ocellata Klunzinger 1880 Synonym
Scatophagus bougainvillii Cuvier 1831 Synonym
Scatophagus maculatus Gronow 1854 Synonym
Scatophagus ornatus Cuvier 1831 Synonym
Scatophagus purpurascens Cuvier 1831 Synonym
Scatophagus quadranus De Vis 1882 Synonym
Scatophagus quadratus De Vis 1882 Synonym

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 56 records indexed .

Occurrence density from GBIF View GBIF records ↗

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