Slipper Lobster (Cigale de Mer) in Mauritius

The slipper lobster, belonging to the genus Scyllarides, is a fascinating and easily recognisable crustacean found throughout the tropical and subtropical waters of the Indo-Pacific — including the lagoons, drop-offs, and outer reefs of Mauritius. Locally called the Cigale de mer (sea cicada), this invertebrate is prized both by divers for its dramatic appearance and, unfortunately, by fishermen for its culinary value.

Identification & Physical Features

Slipper lobsters are instantly distinguishable from spiny lobsters by their flattened, shield-like antennae, known as antennular plates, which extend forward from the head like broad, armoured paddles. Their entire body is dorsoventrally flattened, giving them a prehistoric, tank-like silhouette. Adults in Mauritius typically range from 20 to 40 cm in length and display a mottled combination of reddish-brown, orange, cream, and purple hues that provide excellent camouflage against encrusted reef surfaces. Their hard exoskeleton is heavily textured and ornately patterned, making each individual appear almost carved from coral rock itself.

Behaviour & Ecology

Slipper lobsters are primarily nocturnal hunters, spending daylight hours wedged tightly into reef crevices, beneath rocky overhangs, or hidden under coral rubble. As night falls, they emerge to forage for molluscs, bivalves, sea urchins, and other invertebrates, using powerful mandibles to crush shells with ease. They are generally solitary animals, though divers occasionally encounter small aggregations in particularly sheltered reef zones.

Like all lobsters, slipper lobsters must periodically moult their exoskeleton to grow. After moulting, their new shell is temporarily soft and vulnerable, during which time they remain deeply concealed. Females carry eggs beneath their broad abdomen, and larvae undergo a lengthy pelagic phase before settling on the reef as juveniles.

In the reef ecosystem, slipper lobsters play an important role as benthic predators, helping to regulate populations of molluscs and echinoderms. They also serve as prey for large reef fish, rays, and octopuses, linking invertebrate and fish communities together within the food web.

Where to Find Slipper Lobsters in Mauritius

Mauritius offers excellent habitat for slipper lobsters along its fringing coral reefs, particularly in areas where rocky substrate, coral boulders, and reef walls provide abundant shelter. The best encounters occur at depth between 10 and 35 metres, though juveniles can sometimes be found in shallower lagoon areas. Experienced dive guides know the specific overhangs and caves where resident slipper lobsters can be reliably found during daytime dives, resting in the same favoured spots for weeks or even months at a time.

Night dives dramatically increase your chances of observing active slipper lobsters roaming the reef. Watching these armoured creatures move across the substrate, their flattened bodies gliding surprisingly efficiently, is a memorable experience that highlights the extraordinary diversity of Mauritian marine life.

Conservation Considerations

While slipper lobsters are considered common in Mauritius, they face ongoing pressure from overfishing and targeted collection for the seafood trade. Their slow growth rate and relatively low reproductive output make populations sensitive to sustained harvesting. Responsible divers are encouraged to observe without disturbing, never to handle or reposition slipper lobsters for photographs, and to report any illegal collection activity to local marine authorities. Several Mauritian marine reserves and protected lagoon zones offer these animals a refuge where their populations remain healthier and more visible to divers.

Tips for Divers

• Look under overhangs and inside crevices at depths of 15–30 metres during day dives.
• Book a night dive to watch slipper lobsters actively foraging across open reef.
• Use a torch to illuminate their vivid colouration — the patterns are stunning up close.
• Approach slowly and avoid shining your light directly in their eyes to minimise stress.
• Ask your dive guide about resident individuals at regularly visited sites.