* Algae: This is their main food source. They graze on a variety of algae, including filamentous, coralline, and turf algae.
* Seaweed: Some surgeonfish species also consume seaweed.
* Zooplankton: While their primary diet is plant-based, they may also eat small amounts of zooplankton, especially when younger.
Their diet can vary depending on the species and their location.
It's important to note that surgeonfish are vital for coral reef ecosystems. They help to control the growth of algae, which in turn allows coral to thrive.