Marbled lungfish
African lungfish with the largest known animal genome, found in East and Central Africa.
The marbled lungfish (Protopterus aethiopicus) is a freshwater species native to Africa. It holds the record for the largest animal genome at 133 billion base pairs. Locally, it serves as a food source and traditional medicine.
- Holds the largest known animal genome at 133 billion base pairs.
- Can reach a maximum length of two meters.
- Survives dry periods by estivating in mud cocoons.
- Found in major African rivers and lakes including Victoria and Congo.
- Males guard egg nests for eight weeks after females leave.
What it is
This ancient fish features a smooth, cylindrical body covered in deeply embedded scales. Its skin displays a yellowish gray or pinkish background marked by dark slate-gray splotches, creating a marbled appearance. The tail tapers sharply, while the pectoral and pelvic fins are exceptionally long and thin, resembling spaghetti strands used for gliding. Adults can grow up to two meters in length. Juveniles possess branched external gills similar to newts, which disappear after a few months as they develop standard gill openings.
Where it lives
The species inhabits waters across Eastern and Central Africa, including the Nile and Congo River basins. It thrives in major lakes such as Victoria, Tanganyika, Albert, Edward, Turkana, Kyoga, No, and Nabugabo. Specific subspecies occupy distinct zones: P. a. aethiopicus resides in the Nile basin, P. a. congicus in the Congo River, and P. a. mesmaekersi in the lower Congo. Countries include Angola, Burundi, Egypt, Ethiopia, Kenya, Rwanda, South Sudan, Sudan, Tanzania, Uganda, and Zambia.
How it lives
Adults dwell in swamps, river deltas, and floodplains, often hiding among papyrus roots as juveniles. They survive dry seasons by burrowing into mud to form cocoons and estivating until rains return. While once thought to rely solely on air breathing, recent studies indicate they primarily use aquatic respiration unless constrained. Their diet consists mainly of mollusks like Mutela bourguignati, supplemented by small fish and insects. Youngsters feed almost exclusively on insects.
Breeding and life cycle
Males construct pit nests during flood seasons, though research suggests year-round reproduction occurs. Females deposit eggs in these pits before departing. Males guard the nest for eight weeks, aerating it regularly to protect the developing embryos. Experiments in Lake Baringo show individuals in all maturity stages throughout the year. Growth data indicates a low reproductive effort, with maturity reached around three years of age.
Fish and people
Fishers harvest hundreds of tonnes annually, particularly in the Mwanza Gulf of Lake Victoria. Culinary value varies by community; some regard it as a delicacy, while others dislike its taste or consider eating it taboo. Beyond food, various parts serve as ingredients in traditional medicine practices within specific regions. This dual role highlights its complex relationship with local human populations across its extensive African range.
Status and threats
No specific conservation threats are detailed in the provided text. The species remains widespread across numerous African countries and river systems.
Questions people ask about Marbled lungfish
What makes the marbled lungfish genetically unique?
It possesses the largest known genome of any animal, containing 133 billion base pairs. This massive genetic structure is shared only by a few other organisms like certain ferns and flowering plants, making it an extreme outlier in biological genomics.
How does this fish survive when water dries up?
Adults burrow into the ground to form a cocoon with an air bubble. They breathe through a hole in this cocoon while estivating, allowing them to endure prolonged dry seasons in riverbeds and swamps where surface water disappears completely.
Is the marbled lungfish safe to eat everywhere?
Consumption varies significantly by community. Some groups view it as a delicacy, while others strongly dislike its taste or consider eating it a taboo. Traditional medicine also utilizes parts of the fish in certain regions, indicating diverse cultural relationships.
Do males help raise the young?
Yes, males prepare pit nests and guard them for eight weeks after females lay eggs. They regularly fill the nest with air to ensure egg survival. Research suggests they may reproduce year-round rather than just during floods.
Good reading and sources
- Marbled lungfish on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Marbled lungfish", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
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