The orange-lined triggerfish, orange-striped triggerfish or undulated triggerfish (Balistapus undulatus) is a triggerfish of the tropical Indo-Pacific area. It is the only member of the genus Balistapus. They reach a maximum size of about 30 cm. They feed on coral, crabs and invertebrates. They are found up to around 50 m deep in tropical waters.
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