Goniistius zonatus is a species of fish belonging to the family Kyphosidae, commonly known as the sea chub. This fish is primarily found in the warm waters of the Pacific Ocean, particularly around coral reefs and rocky substrates. It is recognized for its elongated body and distinctive coloration, which typically features a mix of green and yellow hues. The diet of Goniistius zonatus mainly consists of algae and small invertebrates, making it an important herbivore in its ecosystem. These fish are often seen in schools, providing safety in numbers from predators. Their presence contributes to the health of coral reef environments by helping to control algal growth.