
Source: Wikimedia Commons
Lepidosiren paradoxa
The only lungfish in South America: eel-like with thread-like fins, and an obligate air-breather that drowns without surface access. It exceeds 1 m, so lifelong care needs a very large tank.
Lepidosiren paradoxa is the sole member of its family and the only lungfish known from South America, in a different family from the African Protopterus. It ranges widely through the Amazon, Paraguay and lower Paraná basins. FishBase gives a maximum of 125 cm TL and a maximum reported age of 8 years. It lives in stagnant swamps and backwaters; its gills are so reduced that it drowns if denied access to air. In the dry season it burrows 30-50 cm into mud and lowers its metabolism. It breeds in the rainy season, when males guard eggs and young in a burrow and develop feathery, blood-rich structures on the pelvic fins. Juveniles are black with gold spots. Captive breeding has not been reported. Juveniles occasionally reach Japanese specialist shops as 'ancient fish'; buyers should confirm they can provide a tank for a fish that reaches over a metre.
Source: Wikipedia (CC BY-SA 4.0)
The South American lungfish lives Maximum reported age 8 years (FishBase); captive lifespan poorly documented.
The South American lungfish grows to Up to 125 cm TL (FishBase).
The ideal temperature for the South American lungfish is 24〜28℃.
Origin
South America (Amazon, Paraguay and lower Paraná basins)
Lifespan
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Primary sources
Not listed in the CITES Appendices (checked on Species+). Not regulated under Japan's Invasive Alien Species Act. It exceeds 1 m, so plan for lifelong housing and never release it into the wild.
Sources: Species+ (CITES) / FishBase
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Maximum reported age 8 years (FishBase); captive lifespan poorly documented
Size
Up to 125 cm TL (FishBase)
Temperature
24〜28℃
Omnivore (fish, shrimp and shellfish, plant matter)
24-28°C (FishBase), pH 6.0-8.0, 2-20 dH (Seriously Fish). Produces heavy waste, so strong filtration is needed.
It grows beyond 1 m, so lifelong care requires a very large tank (Seriously Fish suggests a 240 x 90 cm footprint). Leave an air gap under a gap-free, secure lid to prevent escapes.
Usually peaceful with fish too large to swallow, though some attack other bottom-dwellers. Keeping it alone is safest.
Offer prawn, mussel, fish pieces, sinking prepared food and plant matter. Reduce frequency as it grows; adults need about one meal a week. Avoid mammal or poultry meat.
Not bred in captivity. In the wild it breeds in the rainy season, the male guarding eggs and young in a burrow.
It drowns without access to air. It can break heaters and thermometers, so guard them or keep equipment outside the tank. Never release it.
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for South American lungfish is 24〜28℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of South American lungfish is Maximum reported age 8 years (FishBase); captive lifespan poorly documented. With proper care and nutrition, they can live a long and healthy life.
South American lungfish typically reaches Up to 125 cm TL (FishBase) as an adult. Size may vary depending on care conditions and individual genetics.
South American lungfish feeds on: Omnivore (fish, shrimp and shellfish, plant matter). Aim for a balanced diet with appropriate feeding frequency.
The price of South American lungfish varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 23, 2026