Herbivorous fish are species that primarily feed on plant material, such as algae, seaweed, and aquatic plants. They play a crucial role in maintaining the health of marine and freshwater ecosystems by controlling algae growth and promoting the growth of beneficial plants. Common examples include parrotfish and surgeonfish. These fish have specialized teeth and digestive systems adapted for processing plant matter. Some herbivorous fish, like manatees, are known to graze on seagrass, while others, such as tangs, consume algae directly from rocks and coral surfaces. Their feeding habits contribute to the overall balance of their habitats.