Coin de Mire-Head, Trou aux Biches: Reef and Cave Diving in Mauritius

Diving Coin de Mire-Head begins on the southwest side of Coin de Mire island, as you trace the contour of the southern reef from west to east. This dive truly comes alive as the reef gradually transforms into an impressive drop-off, a vertical challenge that draws you deeper into the blue. Your descent will reveal a thriving ecosystem, where the shelf transitions into the wall at varying depths, creating clear zones for exploration.

The topography here is dynamic, characterized by the sheer volume of schooling fish. You'll likely find yourself enveloped by massive quantities of fusiliers (Caesionidae), their synchronized movements a living spectacle. This abundance of smaller fish naturally attracts larger predators, with bluefin trevally (Caranx ignobilis) frequently observed hunting through the shimmering masses, offering a real insight into the food chain in action.

Beyond the fusiliers, the reef itself supports a diverse community. Expect to encounter large parrotfish (Scaridae) grazing on the coral, their powerful beaks constantly reshaping the reefscape. Schools of pilotfish (Naucrates ductor) often cruise alongside, adding to the pelagic feel of the dive. This site’s position and the currents it experiences also make it a transit point for open-ocean hunters.

Keep a keen eye on the open water; barracudas (Sphyraena) are not uncommon here, often lurking at the edge of visibility or patrolling the reef structure. The presence of dogtooth tuna (Gymnosarda unicolor) adds another exciting dimension to the dive, their streamlined forms a testament to the powerful currents that can sweep through this area. These encounters underscore the healthy, predator-rich environment of Coin de Mire-Head.

One of the site's unique features, when conditions allow, is a beautiful cavern system. If the sea is calm, you can explore a captivating grotto that lies no deeper than 6 metres and extends for 30 metres or more underneath the island. Navigating this overhead environment requires careful buoyancy control and the ability to operate effectively in low light. This distinct element distinguishes Coin de Mire-Head from other reef dives in the area.