Ribbon Eel Identification Guide
Recognize this slender moray by its flared nostril tentacles and dramatic color change from black juvenile to blue-and-yellow adult.
Read the full Ribbon Eel encyclopedia entry →
Key identification features
- Extremely slender, ribbon-like body compared to other morays, with a raised dorsal fin that runs like a low crest along the back
- Distinctive expanded, flared nostrils resembling small tentacles or leaf-like flaps at the tip of the snout
- Juveniles are jet black with a yellow dorsal fin stripe
- As they mature into males, the body turns bright blue with a yellow face and dorsal fin
- Fully mature females are entirely yellow, having transitioned through the black and blue phases with age (protandric sex change)
Common look-alikes
- Other slender morays: none share the ribbon eel's ornate flared nasal tentacles, which are the single most reliable identifying feature at any life stage
- Garden eels: also thin-bodied and seen protruding from sand, but garden eels live in colonial burrows in open sand flats and lack the ribbon eel's flared nostrils and crest-like fin
- Juvenile black morays of other species: lack the ribbon eel's tall dorsal crest and ornate nostril flaps, which set it apart even in its all-black juvenile phase
Where you'll see one
Ribbon eels live on sandy or rubble patches near coral reefs and lagoons throughout the Indo-Pacific, usually with only the head and forebody protruding from a burrow, swaying gently while watching for prey.
Frequently asked questions
How do I recognize a ribbon eel regardless of its color phase?
Look for the flared, leaf-like nostril tentacles and tall dorsal crest; these features are present at every life stage even as the body color shifts from black to blue to yellow.
How do I tell a black juvenile ribbon eel from another dark moray?
Check the nose and fin: a juvenile ribbon eel has ornate flared nasal flaps and a raised dorsal crest with a yellow stripe, features other black juvenile morays lack.