Goniistius is a genus of fish belonging to the family Kyphosidae, commonly known as the sea chubs. These fish are primarily found in the warm waters of the Pacific Ocean, particularly around coral reefs and rocky substrates. They are characterized by their robust bodies and distinctive coloration, which can vary among species. Members of the Goniistius genus are known for their herbivorous diet, primarily feeding on algae and other plant materials. They play an important role in their ecosystems by helping to maintain the health of coral reefs. Their presence can indicate a balanced marine environment, making them significant for ecological studies.