Sharks in Hawaiian Waters . . . About eight species are commonly seen near shore. The most frequently encountered are the Sandbar , Reef Whitetip , Scalloped Hammerhead , and occasionally Tiger . These inshore species are top-level carnivores , feeding primarily on fishes. Their function in reef ecosystems is not fully understood, but they are believed to improve fish populations by removing sick and injured fish, leaving the healthiest to reproduce.
Sharks have extremely well-developed sensory capabilities .
Their eyesight is good, but depends greatly on water clarity. As sharks approach their prey, they can detect the faint electrical fields give off by all living organisms. Receptors on their snouts, known as ampullae of Lorenzini , allow sharks to locate their prey without seeing it. Using these senses, sharks can find prey at dusk, night and dawn, which is when inshore species are generally believed to feed. Sharks are very well aware of their environment and appear to be fairly curious by nature.