Gymnothorax javanicus
Encounter Rate
Spotting Difficulty
Best Season
Year-round
Depth Range
1-50 meters
The giant moray eel is the largest moray species found in Komodo National Park, reaching lengths of up to 3 metres and weighing over 30 kilograms. Despite their fearsome appearance — a massive gaping mouth revealing rows of sharp teeth — these eels are generally docile and spend most of the day hiding in reef crevices and caves with only their heads protruding. The constant opening and closing of their jaws, which often alarms new divers, is simply how they breathe, pumping water over their gills. In Komodo, giant morays are commonly found at reef walls and boulder sites where crevice habitat is abundant. At night they emerge to hunt, using their excellent sense of smell to track down sleeping reef fish, octopuses, and crustaceans. They have been observed hunting cooperatively with roving coral groupers — one of the few known examples of interspecies cooperative hunting among fish. Their skin is covered in a thick mucous layer that protects them from abrasions as they squeeze through tight reef passages.
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Average Size
1.5-2m
Size Range
0.5-3m
Maximum Size
3m, up to 30kg
Nocturnal predator feeding on reef fish, octopuses, crabs, and other crustaceans. Uses an exceptional sense of smell to locate prey in the dark. Possesses a second set of pharyngeal jaws in its throat to pull prey down into the oesophagus.
The giant moray eel is the largest moray species found in Komodo National Park, reaching lengths of up to 3 metres and weighing over 30 kilograms. Despite their fearsome appearance — a massive gaping mouth revealing rows of sharp teeth — these eels are generally docile and spend most of the day hiding in reef crevices and caves with only their heads protruding. The constant opening and closing of their jaws, which often alarms new divers, is simply how they breathe, pumping water over their gills. In Komodo, giant morays are commonly found at reef walls and boulder sites where crevice habitat is abundant. At night they emerge to hunt, using their excellent sense of smell to track down sleeping reef fish, octopuses, and crustaceans. They have been observed hunting cooperatively with roving coral groupers — one of the few known examples of interspecies cooperative hunting among fish. Their skin is covered in a thick mucous layer that protects them from abrasions as they squeeze through tight reef passages.
This species plays an important role in the marine ecosystem of Komodo National Park. Responsible diving practices help protect these animals and their habitat for future generations.
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They are not aggressive toward divers but will bite defensively if threatened or cornered. Most bites occur when divers put hands into reef holes. Maintain respect and distance and they pose no danger.
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