Ribbon Eel in Mauritius: The Jewel of the Reef

The Ribbon Eel (Rhinomuraena quaesita), known locally as the Murène ruban, is one of the most breathtaking marine species you can encounter while diving in Mauritius. With its slender, ribbon-like body, vivid electric-blue coloration, and elaborate yellow facial crests, this eel looks like something conjured from a fantasy. Growing up to 130 cm in length, its flattened body and distinctive fanned nostrils make it instantly recognizable among the diverse marine life found along Mauritius's coral reefs.

Appearance and Biology

The Ribbon Eel is famous not only for its stunning looks but also for a remarkable biological trait: it is a protandric hermaphrodite. All ribbon eels are born male, displaying the iconic black body with yellow dorsal fin typical of juveniles. As they mature, they transition to the vibrant electric blue and yellow of the adult male phase. Eventually, some individuals transform again into females, turning entirely yellow. This dramatic color transformation across their lifecycle makes each sighting uniquely exciting — you're witnessing a living biological story.

Their elongated jaws are always slightly open, which can look intimidating but is simply the eel's way of breathing, drawing oxygen-rich water across its gills. Ribbon Eels are shy, non-aggressive creatures that spend most of their time tucked into sandy burrows or coral crevices, extending only their upper bodies to observe the passing reef world.

Where to Find Ribbon Eels in Mauritius

Mauritius is blessed with an extensive fringing reef system and sheltered lagoons that provide ideal habitat for Ribbon Eels. They prefer sandy substrates adjacent to coral formations, where they can anchor their tail into a burrow while surveying their surroundings. Depths of 1 to 57 metres have been recorded, but in Mauritius they are most reliably seen at 10 to 25 metres — comfortably within recreational diving range.

The best encounters tend to happen when divers approach slowly and remain horizontal, minimizing disturbance. Look carefully along sandy channel floors, between coral bommies, and at the base of reef walls. Patience is rewarded — once a Ribbon Eel feels safe, it may extend a full metre of its iridescent body from its burrow, swaying gently in the current.

Behaviour and Diet

Ribbon Eels are ambush predators, feeding primarily on small fish and crustaceans that venture too close to their burrow. They rely on their excellent sense of smell — channelled through those distinctive tubular nostrils — to detect prey. Sightings of feeding behavior are rare but spectacular. More commonly, divers observe them in their characteristic pose: head and upper body extended, mouth slightly agape, their bodies gently undulating with the water movement.

Conservation and Status

The Ribbon Eel is currently listed as Least Concern by the IUCN, though collection for the aquarium trade poses a localized threat in some parts of its range. In Mauritius, the reef ecosystem is protected within marine parks and conservation zones, which helps maintain healthy populations. Responsible diving practices — no touching, no disturbing burrows, maintaining good buoyancy — are essential to ensure these enchanting creatures remain a feature of Mauritian reefs for generations to come.

Tips for Divers

• Go slow: Approach Ribbon Eels at a crawl, staying low to avoid casting shadows over their burrow.
• Use a guide: Local dive masters know exactly where resident eels live and can take you directly to reliable sighting spots.
• Morning dives: Ribbon Eels tend to be more active and visible in morning hours before reef traffic increases.
• Bring a macro lens: The intricate detail of their facial crests and skin texture rewards close-up underwater photography.

Diving with a Ribbon Eel in Mauritius is a genuine bucket-list moment — a reminder of just how extraordinary the underwater world of the Indian Ocean truly is.