PARROTFISH eat algae and seaweed. These brightly colored fish with beaklike mouths inhabit coral reefs, the wellsprings of ocean life. Without them and other herbivores, algae and seaweed would overgrow the reefs, suppress coral growth and threaten the incredible array of life that depends on these reefs for shelter and food.

This was happening in Bermuda, until the government in 1990 banned fish traps that were decimating the parrotfish population. Today, Bermuda's coral reefs are relatively healthy, a bright spot in the wider Caribbean, where total coral cover has declined by half since 1970.

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