How do parrotfish help make sandy beaches?
Quick Answer
Parrotfish scrape algae off coral with beak-like teeth and grind up bits of reef rock. Much of the sand on tropical beaches can come from their digested coral material.
The Full Story
Parrotfish have fused teeth that form a hard, parrot-like beak. They use it to graze algae from coral surfaces, but they also bite pieces of coral and rock while feeding. The material is ground up in the fish's throat, and much of it passes out as sand-sized particles. In some reef areas, a single large parrotfish can produce a surprising amount of sand each year. Their feeding helps keep reefs clean, though heavy grazing can also shape reef communities.
Key Facts
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"The fish that makes beaches out of coral!"
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