Green moray
Largest tropical Atlantic moray eel with green mucus coating
The green moray is a large eel found in the western Atlantic Ocean. It reaches lengths of 2.5 metres and lives in coastal waters down to 40 metres deep. Its distinctive green colour comes from mucus rather than skin pigment. The species is listed as least concern by conservation groups.
- Largest moray eel in the tropical Atlantic
- Green colour comes from mucus, not skin pigment
- Can cause ciguatera fish poisoning if eaten
- Mostly nocturnal with home ranges of 5.8 hectares
- Found from New York to Brazil in western Atlantic
What it is
The green moray is a member of the moray eel family. It is the largest moray species in the tropical Atlantic and one of the biggest known globally. Adults can grow up to 2.5 metres long. Despite its name, the eel is not naturally green. Its skin is dark, but a thick layer of yellow mucus secreted by specialised cells covers the body. This mucus mixes with blue undertones to create a bright green appearance. Preserved specimens lose this coating and reveal the darker skin beneath.
Where it lives
This species inhabits the western Atlantic Ocean. Its range extends from Long Island in New York south to Bermuda and into the northern Gulf of Mexico. It is also found along the coast of Brazil. Green morays live at depths of up to 40 metres. They frequent rocky submarine canyons, offshore reefs and mangrove estuaries. A study in St. Croix tracked individuals in the Salt River Bay mangrove area, confirming their presence in these sheltered coastal habitats.
How it lives
Green morays are primarily nocturnal hunters. Tracking data shows they are more active at night than during the day. Their diet consists mainly of fish and crabs. Some individuals cooperate with other predators while hunting. For example, Brazilian snappers have been observed recruiting green morays to help forage in mangroves. Most eels maintain a home range of about 5.8 hectares. Larger eels sometimes migrate to offshore reefs or canyons, moving over a single night in winter or spring after exploring their local bay.
Fish and people
People generally do not eat green moray due to health risks. Consuming them can cause ciguatera fish poisoning, a type of foodborne illness. However, they are occasionally captured for display in public aquaria because of their striking colour and large size. They are not considered endangered, though moray eels as a group are often undercounted in visual surveys. Their role in local culture or faith is not widely documented in available records.
Status and threats
The International Union for Conservation of Nature rates the green moray as least concern. There are no major threats identified for the population beyond occasional removal for the aquarium trade. Moray eels in general remain understudied, making precise population counts difficult. Traditional visual surveys often miss them because they hide in crevices. Acoustic tracking helps researchers understand their movement patterns better than visual methods alone.
Questions people ask about Green moray
Why is the green moray green?
The green colour is not from the skin itself. It comes from a thick layer of yellow mucus secreted by specialised goblet cells. This mucus covers the eel's naturally dark skin, creating a green appearance through light reflection.
Is it safe to eat green moray eel?
No, it is typically not eaten. Green morays can carry toxins that cause ciguatera fish poisoning. This makes them unsafe for human consumption, so they are avoided as a food source in most regions.
How large do green morays get?
They are the largest moray species in the tropical Atlantic. Adults can reach lengths of up to 2.5 metres, which is about 8.2 feet. This makes them one of the largest moray eel species known worldwide.
Good reading and sources
The facts on this page come from the Wikipedia article "Green moray", 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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