Fire eel
Large spiny eel with red markings from Southeast Asia
The fire eel is a large freshwater fish native to lowland rivers in Southeast Asia. It features a long body, pointed snout and bright red stripes that deepen with age. While popular in aquariums, it faces local pressure from overfishing in some regions.
- Largest species in the spiny eel family
- Can reach lengths of up to 1 metre
- Juvenile markings change from yellow to deep red
- Native to lowland rivers in Southeast Asia
- Often buries itself in muddy riverbeds
What it is
The fire eel is a large member of the spiny eel family, though it is not a true eel. It has an extremely elongated body that flattens towards the tail. A pointed snout and underslung mouth define its head. The base colour is dark brown or grey with a lighter belly. Bright red stripes and spots decorate the sides, often edged in red on the fins. Juveniles show yellow or amber marks that turn deep red as the fish grows. Small dorsal spines sit before the main dorsal fin, giving the group its name.
Where it lives
This species lives across lowland areas of Southeast Asia. Its range includes central and southern Thailand, Cambodia, southern Vietnam and Peninsular Malaysia. It is also found in Borneo, covering Brunei, Indonesia and Malaysia, as well as Sumatra in Indonesia. These fish prefer slow-moving rivers and flood plains. They are bottom-dwellers that favour environments with muddy substrates. They often bury themselves in the riverbed, leaving only their snout exposed to the water above.
How it lives
Fire eels are omnivorous and feed on a varied diet. In the wild, they consume insect larvae, worms, crustaceans and smaller fish. They also eat plant matter and detritus found on the river floor. In captivity, they rarely accept plant material. Their behaviour involves spending much of their time hidden in the mud. This camouflage helps them ambush prey and avoid detection. They are solitary hunters that rely on their sensitive snouts to locate food in murky waters.
Fish and people
The fire eel is a notable species in the aquarium trade due to its striking appearance. Hobbyists value the bright red markings that develop in mature specimens. It is also caught for food in parts of its native range. Local populations have declined in areas such as Cambodia and Thailand because of overfishing. Despite this pressure, the species remains common overall across its broad distribution. Care is needed in captivity due to its large size and specific dietary needs.
Status and threats
Local declines have been recorded, particularly in Cambodia and Thailand, driven by overfishing. However, the species remains common across most of its range. It is not currently listed as threatened globally. Conservation efforts focus on monitoring harvest levels in affected areas. The broad distribution across multiple countries helps buffer the population against localized threats. Habitat preservation in slow-moving rivers and flood plains remains important for its continued survival.
Questions people ask about Fire eel
Is the fire eel a true eel?
No, it is not a true eel. It is an elongated percomorph fish belonging to the spiny eel family. True eels are in a different order. The fire eel has small dorsal spines before its dorsal fin, which is a key trait of its family.
How large do fire eels grow?
The fire eel is the largest species in its family. It can reach a maximum length of 1 metre, which is approximately 3.3 feet. This substantial size makes it a significant predator in its native freshwater habitats.
What do fire eels eat in the wild?
They are omnivores that feed on invertebrates like insect larvae, worms and crustaceans. They also eat smaller fish, plant matter and detritus. In captivity, they rarely consume plant material, preferring animal-based foods.
Where are fire eels found?
They are native to lowland Southeast Asia. Their range includes Thailand, Cambodia, Vietnam, Malaysia, Borneo and Sumatra. They inhabit slow-moving rivers and flood plains with muddy bottoms where they can bury themselves.
Good reading and sources
The facts on this page come from the Wikipedia article "Fire eel", 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.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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