Gilled African Lungfish Care Guide - Habitat, Diet & Breeding

The Gilled African Lungfish is an unusual, eel-shaped freshwater predator with a long cylindrical body, a blunt head and greatly reduced paired fins that resemble slender filaments. Its olive-brown to grey coloration provides camouflage among mud, vegetation and submerged roots, while the body may be marked with darker mottling or subtle spotting.

Although it has functional gills when young, adults rely heavily on a pair of lungs and must regularly reach the water surface to breathe atmospheric air. This adaptation allows the species to survive in warm, stagnant and oxygen-poor waters that would be unsuitable for many other fish.

It is generally solitary and spends much of its time resting on or within the substrate, becoming more active when hunting. Its powerful jaws and small, sharp teeth are suited to consuming animal prey, and it can swallow surprisingly large food items relative to its narrow body.

During severe seasonal drought, African lungfish can burrow into wet mud and surround themselves with a protective mucus cocoon while entering a dormant state called aestivation. This remarkable survival strategy is a defining feature of the species, although it is rarely appropriate or necessary to replicate in a home aquarium.

The Gilled African Lungfish is native to seasonal freshwater wetlands, floodplains and slow-moving waters of eastern Africa, particularly coastal areas of Kenya, Tanzania and Mozambique. It is associated with habitats that may shrink dramatically or dry out during the dry season.

An adult Gilled African Lungfish requires a very large, secure aquarium of at least 1,000 litres, with a footprint around 250 × 100 cm or larger; additional length and floor space are preferable. The tank must have a tightly fitting, escape-proof cover while leaving clear access to the surface for breathing, and filtration should be powerful but not excessively turbulent. Use a deep layer of smooth, soft sand or fine mud-like substrate, along with robust wood, smooth rocks and sturdy plants arranged to provide shelter without sharp edges or unstable structures. Avoid delicate plants and small openings, as this powerful fish can move substantial amounts of substrate and may injure itself while burrowing.

Up to about 44 cm (17.3 in) in length. Reliable external size differences between the sexes are not established.

This carnivorous species should be offered a varied diet of meaty foods such as earthworms, prawns, mussels, fish fillet and suitable whole aquatic prey. High-quality sinking carnivore pellets can supplement fresh or frozen foods, but an exclusive diet of feeder fish should be avoided because of disease and nutritional risks. Feed appropriately sized portions and remove uneaten food promptly, as lungfish produce substantial waste.

Gilled African Lungfish are best kept alone because they are large, predatory and capable of injuring or swallowing tankmates. Smaller fish, shrimp, snails and delicate bottom dwellers are unsafe, while similarly sized fish may be bitten or stressed. In practice, a species-only aquarium is the safest arrangement; mixing with other large fish is risky and requires an exceptionally spacious system with no guarantee of compatibility.

Breeding Gilled African Lungfish is exceptionally uncommon in aquaria. In nature, pairs breed in burrows or submerged nesting chambers, where the male guards the eggs and newly hatched young. The larvae initially possess external gills and adhesive organs, and successful breeding requires a very large, mature setup with suitable soft substrate and highly stable conditions; this species is not a realistic breeding project for most home aquarists.

Gilled African Lungfish show little or no dependable visible sexual dimorphism. Males and females are generally similar in body shape and coloration, so sex is difficult to determine from appearance alone.