Spotted African Lungfish Care Guide - Habitat, Diet & Breeding

The Spotted African Lungfish is a remarkable, eel-shaped freshwater fish with a long, flexible body, tiny reduced fins and a powerful, broad head. Its mottled brown, olive and grey coloration helps it blend into muddy riverbeds and dense aquatic vegetation. Despite its common name, the spotting can vary considerably between individuals and may be subtle in adults.

Like other African lungfish, Protopterus dolloi can breathe atmospheric air using a highly developed lung-like organ. It must regularly reach the surface, and this adaptation allows it to survive in warm, poorly oxygenated waters that would be challenging for most fish. Its thread-like paired fins are used for careful movement along the bottom rather than conventional swimming.

This is a secretive, largely solitary predator that spends much of its time resting among roots, submerged plants and soft sediment. It is capable of sudden movement when hunting, but generally appears slow and deliberate. Its powerful jaws and crushing teeth allow it to consume a wide range of aquatic prey.

During seasonal droughts, African lungfish can tolerate the loss of open water by entering a dormant state within a mucus-lined chamber in the drying substrate. This extraordinary survival strategy is one of the reasons lungfish are regarded as some of the most evolutionarily distinctive living freshwater fish. They are not community aquarium fish and are best viewed as specialist animals for very large, secure systems.

The Spotted African Lungfish is native to tropical central-western Africa, particularly the Congo Basin and adjoining river systems of the Republic of the Congo, the Democratic Republic of the Congo and Gabon. It inhabits slow-moving rivers, floodplain pools, swamps and seasonally isolated waters.

An adult Spotted African Lungfish requires a purpose-built aquarium or indoor pond of at least 2,000 litres, with substantially more volume preferred for a full-grown specimen. A footprint of around 300 × 100 cm should be regarded as a bare minimum starting guideline, with a larger, longer enclosure providing a much better swimming area. Use a deep, secure lid because lungfish are powerful escape artists and must have clear access to the surface for air. Provide subdued lighting, strong but gentle filtration, open bottom space and sturdy shelter made from smooth rocks, large wood or robust artificial structures; avoid sharp decor and fine loose substrate that could be swallowed.

Spotted African Lungfish can reach approximately 130 cm (51 in) in total length. Females are often reported to grow larger and heavier than males, although reliable sex-linked size differences are difficult to assess in aquarium specimens.

Offer a varied carnivorous diet based on meaty foods such as earthworms, prawns, mussel, squid, fish pieces and suitably sized whole aquatic prey. High-quality sinking carnivore pellets can be useful when accepted, but should not be the only food. Feed carefully sized portions and remove leftovers promptly, as lungfish are messy eaters and excess food can rapidly degrade water quality.

Spotted African Lungfish are best kept alone. They are opportunistic predators and may swallow, injure or severely harass any fish small enough to fit in their mouths, while their powerful bodies can damage slower or delicate tankmates. Even large companions can be stressed or bitten, so mixed housing is generally inappropriate. Snails, shrimp, crayfish and other invertebrates are also likely to be eaten, and keeping more than one lungfish together risks aggression and competition for shelter.

Breeding Spotted African Lungfish is exceptionally rare in home aquaria and has not been reliably established as a routine captive-breeding project. In nature, breeding is associated with seasonal flooding, when males excavate and guard nesting chambers in submerged vegetation or soft substrate. The eggs and developing young require specialized conditions, and the adults’ size, aggression and demanding environmental needs make reproduction unsuitable for all but major public or research aquaria.

There is no consistently reliable external feature for sexing Spotted African Lungfish. Females may become larger and more robust than males at maturity, but body size and proportions overlap, so sex usually cannot be confirmed confidently without breeding observations or specialist examination.