Sea Cucumber in Mauritius — Holothuria spp.
Sea cucumbers, known locally as holothurie or concombre de mer, are soft-bodied marine invertebrates belonging to the class Holothuroidea. In Mauritius, multiple species of the genus Holothuria thrive in the warm, sheltered waters of the island's fringing reef lagoons, seagrass beds, and sandy flats. Their elongated, cylindrical bodies — often resembling a cucumber in shape — come in a variety of colours and textures, from jet black and dark brown to mottled grey and deep olive green.
Behaviour and Biology
Sea cucumbers are deposit feeders, spending their days slowly moving across the substrate and ingesting sediment through their mouths. As they process the sediment, they extract organic matter and expel clean sand — earning them the well-deserved nickname
FAQ
Are sea cucumbers dangerous to touch in Mauritius?
Most sea cucumbers are harmless to handle, but it's strongly advised not to touch or disturb them. Some species can eject sticky, toxic threads (called Cuvierian tubules) as a defense mechanism, which can cause skin irritation. It is also illegal to collect or harvest them in Mauritian waters. Always observe marine life without touching.
Why are sea cucumbers important to the reef ecosystem?
Sea cucumbers are essential bioturbators — they ingest sand and sediment, digest organic material, and excrete clean, aerated substrate. This process recycles nutrients and oxygenates the seafloor, supporting coral growth and seagrass health. They also help regulate calcium carbonate levels, which is critical for coral reef resilience.
Can I eat sea cucumbers in Mauritius?
Sea cucumbers are considered a delicacy in parts of Asia and are highly valued in the dried seafood trade (known as trepang or beche-de-mer). However, harvesting sea cucumbers in Mauritius is regulated, and populations have been impacted by overexploitation historically. Visitors are discouraged from purchasing or consuming wild-caught sea cucumbers, and conservation efforts are in place to protect local populations.
