📖 Overview
Cathorops Nuchalis (Cathorops nuchalis), first described by Günther, 1864 is a medium-sized fish in the family Ariidae (order Siluriformes). Adults typically reach 24.50 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. Diet is predominantly piscivorous, targeting other fish and larger prey. The species is important as a food fish and venomous and potentially dangerous to handle. As a member of the Ariidae, it shares life-history and morphological traits with its relatives in the group.
Scientific Name
Cathorops nuchalis
🐟 Physical Description
Physical description for Cathorops Nuchalis is currently being
compiled.
🌀 Behaviour
Behavioural data for Cathorops Nuchalis is currently being
reviewed.
🦐 Diet
small fish
crustaceans
cephalopods
🥚 Reproduction
🐣 Oviparous
👄 Mouth Brooder
🌍 Habitat & Distribution
Freshwater; brackish; demersal. Tropical South America: Lago de Maracaibo, Venezuela to Guyana.
🌿 Ecology
Zone Preferences
💧 Freshwater
🌿 Brackish
⬇️ Benthic
📐 Morphometrics
Length–Weight Relationship:
W = 0.00468 × L3.13
(TL)
📊 Population Risk & Fisheries
Population Resilience
High
Minimum doubling time
Fishing Vulnerability
29.00/100
Low vulnerability
Trophic Level
4.3
Apex / Top predator
Described By
Günther, 1864
⚠️ Venom Profile
Medical Warning: This species is venomous. Seek immediate medical attention
if envenomated.
Contact emergency services and follow first aid guidance below.
Delivery
dorsal and pectoral spines with venom glands
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
🍽️ Edibility & Flavour
"Cathorops Nuchalis 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
Detailed nutritional data for Cathorops Nuchalis is
currently being compiled from USDA FoodData Central.
🔬 Mercury Safety
Mercury data for Cathorops Nuchalis 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
🔬 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