Protopterus aethiopicus 25 - (Protopterus aethiopicus) — 25-30cm

Overview

African lungfish (Protopterus aethiopicus) represents one of the most ancient and fascinating species available for sale UK, captivating advanced aquarists with its prehistoric appearance and remarkable air-breathing ability. This massive species originates from Eastern and Central Africa, including parts of the Nile basin, where it inhabits swamps, floodplains, and slow-moving waters. Available in sizes from 25-30cm, the species grows into a true giant reaching up to 150cm in length, demanding enormous aquarium space, expert-level care, and a lifetime commitment. The marbled patterning, functional lungs allowing atmospheric breathing, and prehistoric lineage make this one of the most extraordinary oddball species in the hobby. Only experienced aquarists with appropriate facilities, resources, and long-term plans should consider this ultimate giant.

Appearance

Protopterus aethiopicus displays an elongated, eel-like body with reduced, filamentous paired fins resembling thin appendages. The body is robust and muscular, covered in large scales and a thick protective mucus layer. Coloration features attractive marbled or leopard-spotted patterning with irregular dark blotches and mottling against a grey, brown, or olive background—hence the "marbled lungfish" common name. Juveniles show more defined patterning that may blur slightly as the fish matures. The head is broad and flattened with small eyes positioned dorsally, reflecting the species' reliance on chemoreception for hunting. The mouth is large and equipped with powerful tooth plates for crushing prey. The most remarkable feature is the functional lungs allowing the lungfish to surface and gulp atmospheric air—an obligate behavior essential for survival. Overall appearance is primitive and awe-inspiring, unlike any conventional aquarium fish.

Natural Habitat

This species inhabits swamps, floodplains, oxbow lakes, and slow-moving, heavily vegetated waters throughout Eastern and Central Africa, including the Nile region. Natural habitats experience dramatic seasonal fluctuations, with wet seasons bringing extensive flooding and dry seasons reducing water levels significantly. During severe droughts, Protopterus aethiopicus burrows into mud and enters aestivation (dormancy), surviving months without water by breathing air through a mucus-lined breathing tube. Water conditions are typically warm, soft, acidic to neutral, and low in dissolved oxygen, making the lungfish's air-breathing ability essential. The species is nocturnal, hunting fish, crustaceans, mollusks, amphibians, and other aquatic prey during nighttime hours.

Aquarium Setup

Housing an African lungfish demands a truly massive aquarium or indoor pond of at least 3,000 litres—and realistically, substantially more for long-term success with adult specimens. The tank must be extremely robust, with reinforced glass or acrylic capable of withstanding the fish's considerable size, weight, and power. Use soft sand or bare-bottom substrate to prevent abrasion of the fish's sensitive skin and mucus layer. Provide hiding places using large, smooth rocks, PVC tubes, or driftwood arranged to create secure retreats. Avoid sharp decorations or rough surfaces. Lighting should remain subdued, reflecting the species' nocturnal habits. A secure lid with air gaps is essential—the lungfish must have unrestricted access to the surface to breathe atmospheric air, and full coverage will suffocate the fish. Maintain a gap between the water surface and lid at all times. Ensure excellent water quality with powerful filtration capable of handling the enormous bioload produced by a large predatory fish.

Water Parameters

Maintain tropical temperatures between 24-30°C, with 26-28°C representing optimal conditions. The species tolerates cooler water but becomes less active and feeds less frequently. pH should remain between 6.0-7.5, with slightly acidic to neutral values (6.5-7.0) ideal. Water hardness can range from soft to moderately hard, though soft to moderate hardness better replicates natural African swamp conditions. Ammonia and nitrite must be undetectable, while nitrates should stay below 40 ppm through efficient biological filtration and substantial weekly water changes. Given the enormous bioload produced by a large carnivorous lungfish, expect to replace 40-50% of the water weekly using powerful water-changing systems. Dissolved oxygen levels are less critical than for most fish, as the lungfish breathes atmospheric air, but water quality must remain high to prevent skin infections and disease.

Feeding

As a carnivore, Protopterus aethiopicus requires a diet of meaty foods including earthworms, snails, insect larvae, crustaceans, whole or filleted fish, prawns, mussels, and appropriately sized frozen or thawed carnivore foods. Juveniles accept smaller foods such as bloodworms, blackworms, and chopped shrimp. Feed juveniles every 1-2 days, transitioning to 2-3 times weekly as the fish matures. Avoid overfeeding, which rapidly degrades water quality and leads to obesity. High-quality pelleted foods formulated for large predatory fish can supplement the diet once the lungfish is acclimated. Avoid exclusive reliance on feeder fish, which provide poor nutrition and risk introducing disease. Feed during evening or nighttime hours to align with the species' nocturnal activity. Monitor body condition—a healthy lungfish appears robust but not bloated.

Behaviour

African lungfish are primarily nocturnal, remaining hidden during daylight hours and emerging at dusk to hunt. The species moves with slow, sinuous eel-like movements, alternating between resting on the substrate and short bursts of activity. Swimming behavior appears undulating, with the body flexing and the reduced fins providing minimal propulsion. The lungfish surfaces regularly to gulp atmospheric air, producing audible gasping sounds—this air-breathing behavior is essential and occurs every few minutes to hours depending on water temperature, activity level, and dissolved oxygen. The species is generally peaceful but semi-aggressive during feeding, consuming any tankmate small enough to swallow. Intelligence is evident in the fish's ability to recognize keepers and respond to feeding routines. Stress or poor water quality causes increased hiding, refusal to feed, or skin lesions.

Tank Mates

Selecting tankmates for Protopterus aethiopicus is extremely challenging and generally inadvisable. Only very large, robust fish that cannot be swallowed and are not aggressive or fin-nipping have any chance of cohabitation, and even then risks remain high. Most aquarists maintain this species alone to eliminate stress, reduce aggression, and simplify husbandry. Absolutely avoid small fish, shrimp, snails, slow-moving species, long-finned fish, and any creature that fits into the lungfish's mouth. Even large companions may be harassed or injured during feeding. In practice, a species-only setup is strongly recommended for this demanding giant.

Breeding

Breeding Protopterus aethiopicus in home aquariums is extraordinarily rare and effectively impossible for private aquarists. In nature, the species breeds in seasonal wetlands where males construct burrows and guard nests, caring for developing eggs and young. Successful captive reproduction requires very large, specialized facilities, environmental cues from seasonal flooding, and mature adults in prime condition. Attempting to breed this species at home is impractical given the space requirements, long maturation period, and complexity of replicating natural spawning conditions.

Why Buy from Tropical Fish Co

Tropical Fish Co supplies healthy, carefully selected African lungfish specimens with comprehensive care guidance covering the extreme long-term commitment required. We ensure all fish are feeding well on prepared foods before dispatch and provide detailed information on growth expectations, housing requirements, and the critical importance of surface access for air-breathing. Our experienced team candidly discusses the challenges of keeping this remarkable but demanding species, helping you make an informed decision. With nationwide UK delivery using specialist livestock couriers, your lungfish arrives safely in insulated packaging with oxygen. We support responsible fishkeeping and encourage only those with appropriate facilities and long-term plans to consider this extraordinary prehistoric giant. Choose Tropical Fish Co for rare, specialist livestock and expert guidance.