Saint Helena - List of fishes

The caribbean sergeant major is a tropical fish associated with coral reefs and rocky tropical areas of the western Atlantic Ocean. This small schooling fish has a morphologically very close cousin throughout the Indo-Pacific region: A. sexfasciatus.

The blue shark, also known as the "blue skin shark," is a pelagic predator found in temperate and tropical marine waters, with occasional sightings near the coast. Its wide distribution, however, is threatened by overfishing. Recognizable by its blue back and white belly, this sleek-bodied shark mainly feeds on small fish, mollusks, cephalopods, and sometimes birds.

The whale shark, the largest living shark in the world, frequents tropical and subtropical waters, excluding the Mediterranean Sea. Despite its massive size, it is harmless to humans. Its population has declined due to fishing, and its conservation remains a challenge. These sharks move slowly and feed on plankton, small fish, crustaceans, and squid. They undertake seasonal migrations, and some populations are relatively isolated. Concerns have been raised about the impacts of tourism on their behavior.

The scalloped hammerhead shark, a semi-oceanic hammerhead, is found in tropical and temperate waters worldwide. This species is easily recognizable by its curved flat head and black tips on the pectoral fins. These sharks feed on fish, cephalopods, and crustaceans, taking advantage of their flat head to make tight turns while hunting. Although potentially dangerous and aggressive towards intruders, attacks on humans are rare. Conversely, despite its wide distribution, this species is threatened with extinction.