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Open-water fish (tuna, mackerel, etc.) are not part of the same food chain and are not affected, but any large, predatory reef fish is a candidate.

— David Pickell

Hawkfish. Hawkfishes (family Cirrhitidae) get their name from their predatory habits. These small fish (6-10 cm.) perch on coral heads or sponges—anything that gives them a good lookout—and when a small crustacean or fish comes within range, they swoop down on it like a hawk. Because they are so sedentary, they make very easy photo subjects. Some species are also quite colorful— particularly the large Forster's hawkfish (Paracirrhites forsteri)— and the long-nosed hawkfish (Oxycirrhitus typus) has an interesting, pointed "beak."

Jacks. The jacks or trevallies (family Carangidae) are often seen patrolling the upper reef slope in small groups. They are among the most active predators on the reef. Jacks are always on the lookout for a meal, and groups regularly interrupt their steady cruising with powerful bursts of speed as they chase unwary smaller reef fish. Sometimes a few jacks will make a sortie into a lagoon in search of prey. If they find and attack a school of fish the sea surface erupts as the hunted fish desperately try to escape, sometimes throwing themselves onto the beach in the attempt.