Aba
📖 Overview
Obligate air-breathing ; Obligate air-breathing . Inhabits marginal vegetation and swamps constructing a flask-shaped nest in vegetation during the floods, which it is reputed to defend with vigour . Following flooding of the Gambia River banks, large elliptical floating nests are build in densely vegetated swamps at depths of about 1-1.5 m, in which about 1000 ‘amber-like’ eggs are laid; larvae hatch after 5 days . Feeds on crustaceans, insects and fish . No pelvic, anal or caudal fins . Possesses an electric organ that extends along almost the entire trunk to the tip of the tail . Also equipped with ampullary receptors and two types of tuberous receptors for electroreception . Showed increased electric organ discharge (EOD) rate by 50-60 Hz between 21 and 31°C .
🔬 Taxonomy
🐟 Physical Description
Dorsal spines (total): 0; Dorsal soft rays (total): 183 - 230. Diagnosis: body very elongate , anguilliform , its depth 7.2-10.6 times in SL, and covered with tiny scales . Lateral line complete . Dorsal fin soft-rayed, extending almost over the entire length of back , stopping short of a naked tail . Pelvic, anal and caudal fins absent , body ending in a thin/sharp point . Pectoral fins reduced , 1.9-5.0 times in head length . Head naked, its length 5.6-6.9 times in SL; snout prominent . Mouth large and terminal; teeth strong, pointed or notched, aligned in a single row in both jaws, 12-16 in upper, 22-28 in lower jaw; premaxillae, as well as vomer and palatines, coalesced; maxillae, vomer and palatines toothless; eye very small, without a free margin (covered by skin); only the left gonad is developed and functional . Coloration: dark grey to almost black, darker posteriorly; belly whitish .: elongated; Cross section: circular.
🌀 Behaviour
Behavioural data for Aba is currently being reviewed.
🦐 Diet
🥚 Reproduction
Breeds in well-vegetated, marginal areas of swamps and rivers, where a large, floating nest, about 1 m in diameter, is constructed, in which the eggs are laid and later guarded by one of the parents . Distinct pairing .
🌍 Habitat & Distribution
Freshwater; demersal; pH range: 6.5 - 8.0; dH range: 10 - 25; potamodromous . Tropical; 23°C - 28°C ; 18°N - 2°N, 16°W - 36°E West Africa (Ref.
🌿 Ecology
crustaceans, insects and fish (Ref
📐 Morphometrics
🌡️ Water Parameters & Tolerance
🛡️ Conservation Assessment
📊 Population Risk & Fisheries
🍽️ Edibility & Flavour
"Aba is an edible species."
- 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
- Cloudy or sunken eyes
- Strong fishy or ammonia odour
- Soft, mushy flesh that doesn't spring back
- Discoloured or dry flesh
⚡ Nutrition
Per 100g cooked - Source: USDA FoodData Central
| Nutrient | Amount |
|---|---|
| Protein | 17.4 g |
| Omega-3 (total) | 270 mg |
🔬 Mercury Safety
Mercury data for Aba has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.
🌿 Sustainability
🔬 Full Nutritional Profile
Per 100g - Raw, per 100g - Source: USDA FoodData Central templates (generic fish average)
📊 Population Dynamics
| Year | Region | Index | Notes |
|---|---|---|---|
| - | - | - |
🌐 Names & Taxonomy
| Language | Common Names |
|---|---|
| 🇬🇧English | Aba aba · African Knife Fish · Frankfish · Freshwater Rat-tail · aba |
| 🇸🇦Arabic | Gefar · Raiah Nilieah · Raya Mili · Weer · Wir · Wir / Weer · سمكة السكين الأفريقية |
| 🇩🇰Danish | Nilgedde |
| 🇩🇪German | Großer Nilhecht · Nilhecht |
| 🇮🇹Italian | Gimnarco |
| 🇯🇵Japanese | ジムナーカス |
| 🇳🇱Dutch | Nijlsnoek |
| 🇵🇱Polish | Gymnarchus nilowy |
| 🇵🇹Portuguese | Aba-aba |
| 🇷🇺Russian | Нильский гимнарх |
| 🇸🇪Swedish | Nilgädda |
| 🌍THA | ปลาไหลผีอะบาอะบา |
🗺️ Global Occurrence Map
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 34 records indexed .
👥 Community & Contribute
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