Where do most tetraodontiform fishes live?

Most tetraodontiform fishes are primarily found in tropical marine environments. While they inhabit oceans worldwide, they are especially prominent in shallow waters—typically less than 65 metres (200 feet) deep—where they frequent coral or rocky reefs, as well as open sand and grass flats.12

Exceptions to this general habitat include the Triacanthodidae and Triodontidae families, which are deepwater species. Additionally, while the vast majority of the order is marine, some genera within the Tetraodontidae family are found in freshwater environments.23