Fish
Marine Betta
Calloplesiops altivelis · also called comet
Backed into a crevice with only its tail showing, a marine betta fans its fins to reveal a large, ringed spot that looks uncannily like the face of a moray eel, a bluff aimed squarely at any predator thinking of attacking.
Overview
The marine betta, Calloplesiops altivelis, is native to ocean and coastal reef habitat across the Indo-Pacific region. Its moray-eel false face, nocturnal habits, and flowing fins make it one of the most cleverly disguised and unusual small fish on Indo-Pacific reefs.
A face on the wrong end
The marine betta’s best defence is a decoy, a false eye spot at the tail end that makes a harmless fish look like a dangerous moray, buying it time while its real head stays safely hidden.
Status
Least Concern, widespread but secretive across suitable reef habitat throughout the Indo-Pacific region.
Marine Betta: common questions
How does the marine betta imitate a moray eel?
It hides its real head in a crevice with its tail pointing outward, spreading its fins so that a large, ringed eye spot near the tail looks like the face of a moray eel peering from the rock.
Is the marine betta related to the betta kept in aquariums?
No, it is not related to the freshwater bettas; the name comes from its long, flowing fins.
What does the marine betta eat?
It is a carnivore that feeds on small fish and crustaceans, mostly hunted at night.
Where is the marine betta found?
It is native to ocean and coastal reef habitat across the Indo-Pacific region.