Marbled Lungfish

The Marbled Lungfish (Protopterus aethiopicus) is the largest species in the African lungfish family Protopteridae, native to lakes, swamps, and rivers of East and Central Africa, including the Nile system, Lake Victoria, and Lake Tanganyika basins. Like its relatives, it possesses paired lungs and depends on surfacing to breathe air, and can survive extended droughts by aestivating in a mud burrow sealed with a mucus cocoon. Its large size and wide distribution across major East African lake systems make it one of the most recognizable freshwater fish species in the region.

Marbled Lungfish can be recognized by these traits:

• Large, robust, elongated eel-like body, the biggest of the African lungfish
• Dark grey-green marbled or mottled pattern across the body, giving it its common name
• Thin, whip-like paired fins rather than broad fan-shaped fins
• Small eyes and a blunt, rounded head
• Thick, mucus-covered skin with tiny embedded scales

Its larger adult size and more heavily marbled, rather than simply blotched, pattern help separate it from the smaller West African Lungfish.

This species inhabits freshwater lakes, swamps, and slow rivers throughout East and Central Africa, with major populations in Lake Victoria, Lake Tanganyika, and the wider Nile basin. It favors shallow, vegetated, muddy-bottomed areas where burrowing is possible during dry periods. As oxygen levels in these warm tropical waters can drop significantly, its paired lungs provide a critical advantage, and during severe drought it retreats into a mud burrow, sealing itself in a mucus cocoon until conditions improve.

Marbled Lungfish must regularly surface to breathe air through their lungs, particularly in stagnant or oxygen-poor lake and swamp waters. When their habitat dries during drought, they burrow into mud and aestivate for extended periods, sometimes many months, protected by a mucus cocoon that reduces water loss. Active individuals are solitary predators, using strong jaws to crush and consume mollusks, crustaceans, and other prey. Breeding occurs in the wet season in constructed burrow nests, where a parent guards the eggs and early-stage young until they can survive independently.