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Diadromous Least Concern 🍽️ Edible 🎣 Game Fish ⚠️ Venomous ⚡ Traumatogenic 🌡️ Subtropical

Giant catfish

Netuma thalassina Rüppell, 1837
Max Length
185 cm
Max Weight
1.0 kg
Lifespan
-
Trophic Level
3.5
Depth
10–195 m
Climate
Subtropical
Resilience
Low
Vulnerability
48.00/100
Typical Length
70 cm
Depth Zone
demersal

📖 Overview

A marine species often found in estuaries, but rarely enters freshwater. Typically euryhaline . Reported to occasionally ascend into fresh water . Recorded at temperatures ranging from 26-29°C. Feeds mainly on crabs, prawns, mantis shrimps (Squilla species) but also on fishes and mollusks. An important food fish. Marketed mostly fresh; often dried.

Scientific Name
Netuma thalassina
Authority
Rüppell, 1837
Habitat
Diadromous
Climate
Subtropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
185 cm
Max Weight
1 kg
Depth Range
10–195 m
Latitude
34°S – 34°N
Trophic Level
3.5
Resilience
Low
Vulnerability
48.00/100
Migration
Amphidromous
Salinity
30–40 ppt

🔬 Taxonomy

Kingdom
Animalia
Phylum
Chordata
Class
Teleostei
Teleostei
Order
Siluriformes
Siluriformes
Family
Ariidae
Ariidae
Genus
Netuma
Netuma
Species
Giant catfish
Netuma thalassina

🐟 Physical Description

: fusiform / normal.

🌀 Behaviour

Behavioural data for Giant catfish is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

Size at Maturity
36.3cm TL

Incubates eggs in the mouth. The fry continue to take refuge in the mouths of the male fish for the first 2 months and once they leave, the males start to eat avidly and may consume their own young.

🌍 Habitat & Distribution

Marine; freshwater; brackish; demersal; amphidromous ; depth range 10 - 195 m . Subtropical; 34°N - 34°S, 32°E - 154°E West Pacific: known with certainty from the Red Sea and the northwestern Indian Ocean.

🌿 Ecology

Zone Preferences
🌊 Marine 💧 Freshwater 🌿 Brackish ⬇️ Benthic
Migration
Amphidromous
Trophic Level
3.5±0.2
Food Items

crabs, prawns, mantis shrimps (Squilla species) but also on fishes and mollusks

📐 Morphometrics

Length–Weight Relationship: W = 0.00794 × L3.07 (TL)
Max TL
185cm
Max Weight
1,000g

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2023

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
48.00/100
Moderate-High vulnerability
Trophic Level
3.5
Predator
Body Shape
Fusiform / normal
Climate Zone
Subtropical
Latitude Range
34°N – 34°S
Described By
Rüppell, 1837

⚠️ 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
Delivery
dorsal and pectoral spines with venom glands
Potency
Mild
Mortality Risk
Low
Symptom Onset
2min
Duration
12.0hrs
Antivenom
✗ Not Available
Named Toxins
crinotoxins protein toxins
Symptoms
  • pain
  • oedema
  • rare systemic effects
Affected Body Systems
peripheral nervous system
First Aid
Hot water immersion.
Medical Treatment

Wound care, analgesia.

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

🎣 Angling Guide

Difficulty
Beginner
Fight Rating
strong pulls with head-shakes
Best Seasons
spring,summer,fall
Best Time
incoming tide, dawn and dusk
Line Weight
15-30
Rod Type
medium-heavy spinning
Hook Size
2/0-5/0
Catch & Release
✓ Recommended
Best Months
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Techniques
bottom fishing popping cork soft plastics live bait
Bait & Lures
live shrimp cut mullet soft plastic paddle-tails popping corks
Recommended Tackle
  • medium-heavy 7ft spinning rod
  • 30-50 lb braid
  • fluorocarbon leader
Where to Find Them
  • grass flats
  • oyster bars
  • marsh drains
  • deeper channel edges
Tips & Tricks
Popping cork technique attracts fish from distance. Fish moving tides.
Catch & Release Tips

Use barbless hooks, minimise air exposure, and revive fish head-first in current before release.

Regulations Summary

⚠️ Slot limits protect breeding-size fish. Verify daily bag limits.

🍽️ Edibility & Flavour

"Giant catfish is an edible species."

✗ Not for Raw
✓ Fresh Indicators
  • Clear, bright eyes — cloudy eyes indicate age
  • Firm flesh that springs back when pressed
  • Fresh ocean smell, never strong or ammonia-like
  • Bright red or pink gills, not grey or brown
  • Shiny, moist skin with scales tightly attached
✗ Avoid If
  • Cloudy or sunken eyes
  • Strong fishy or ammonia odour
  • Soft, mushy flesh that doesn't spring back
  • Discoloured or dry flesh
Best Cooking Methods
Baking Grilling Pan-frying

⚡ Nutrition

Per 100g cooked - Source: USDA FoodData Central

Nutrient Amount
Protein 18.1 g
Omega-3 (total) 348 mg

🔬 Mercury Safety

Mercury data for Giant catfish has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.

🌿 Sustainability

Best Choice
Healthy stocks, low impact
Good Alternative
Well-managed, minor concerns
Use Caution
Check sourcing and season
Avoid
Overfished or high impact
✓ Sustainable Choice

🔬 Full Nutritional Profile

Per 100g - Raw, per 100g - Source: USDA FoodData Central templates (generic fish average)

Proximate Composition
Energy125 kcal
Moisture75 %
Protein20 %
Total Fat4 %
Ash1.3 %
Fatty Acids (g)
Saturated Fat1 g
Monounsaturated Fat1.2 g
Polyunsaturated Fat1.5 g
Omega-3 Total1 g
EPA0.3 g
DHA0.5 g
Omega-6 Total0.3 g
Key Minerals & Vitamins
Calcium20 mg
Iron0.7 mg
Magnesium30 mg
Phosphorus220 mg
Potassium380 mg
Sodium55 mg
Zinc0.5 mg
Selenium32 µg
Vitamin B122 µg

📊 Population Dynamics

Year Region Index Notes
- - -

🌐 Names & Taxonomy

Language Common Names
🇬🇧English Giant Sea Catfish
🇫🇷French mâchoiron titan
🇯🇵Japanese オオサカハマギギ
🇪🇸Spanish bagre titan

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 24 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

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