Yes, they are many species of fish that are herbivorous (relying on plants for their dietary needs). Scat, silver dollar, and goldfish are a few examples to give you an idea.
This herbivorous fish are proving to be very beneficial to certain ecosystems. They have been studied and found to protect the growth of coral reef in the sea. Since these fish eat plants and plankton, they digest the macro-algae that is known to overgrow coral. The fish help to allow the coral its space. Some scientists are concerned that areas that are over-fished with not have enough herbivorous fish to help the coral.
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