Of the 400 species of sharks, less than a dozen are actually dangerous for humans, even if none should be excited. The whitefin shark (Carcharhinus albimarginatus) lives in the open sea on the reefs and outside the passes. It is a nervous and curious shark which sometimes swims up to the surface. When it moves away, it becomes virtually invisible in the water and is distinguished only by the three triangular white tips that mark its dorsal and caudal fins. But watch out when it suddenly pops up from behind or below !