Moray eels are a distinctive group of elongated fishes belonging to the family Muraenidae. They are part of the eel order and share the long, serpentine body typical of other eels (Anguilliformes and related groups). About 200 species are recognized across roughly 15 genera, and they occur in tropical, subtropical and temperate seas around the world.

Appearance and anatomy

Morays have smooth, scaleless skin and bodies adapted for slipping into crevices. They lack pectoral and pelvic fins that other fishes possess; their dorsal, anal and caudal fins form a continuous fin running the length of the body. Size varies by species, from relatively small forms to larger species reaching several meters.

Notable anatomical features include sharp, often recurved teeth suited to catching fish, crustaceans and cephalopods, and a second set of jaws in the throat called pharyngeal jaws, which can extend forward to secure prey before swallowing.

Habitat, behavior and life cycle

Most morays inhabit rocky reefs, coral crevices, and submerged structures where they shelter during the day and hunt at night. Many species have a planktonic larval stage known as a leptocephalus that drifts in open water before metamorphosing into the benthic juvenile form. Some morays tolerate brackish conditions but the majority are marine.

  • Diet: carnivorous—fish, crustaceans, and octopuses are common prey.
  • Behavior: largely solitary and secretive; some form cleaning relationships with smaller fishes and shrimp.
  • Reproduction: generally egg-laying with a free-swimming larval phase.

Morays play an important ecological role as mid-level predators on reefs, helping regulate populations of smaller fishes and invertebrates. They are sometimes featured in aquarium displays, though they require large tanks and careful husbandry.

Human encounters usually occur when divers reach into crevices or when morays are provoked; bites can be painful and may become infected, so caution is advised. For readers seeking a taxonomic overview or species list, resources cover the many species and genera: see species lists and genus summaries such as species overviews and genera references.

Overall, moray eels are a diverse and recognizable family of fishes valued by scientists and divers alike for their specialized anatomy, secretive habits, and role in marine ecosystems.