Which foods are eaten by many tetraodontiform fishes with large fused teeth?

Many tetraodontiform fishes possess massive, well-developed dentition, often with teeth fused into a parrotlike beak. Because of these specialized jaws, most of these fishes are opportunistic predators that feed on hard-shelled organisms, including:

• Crustaceans
• Mollusks (such as clams and oysters)
• Echinoderms (such as spiny sea urchins)

While this diet is common for the order, there are notable exceptions. For instance, some species with massive, crushing jaws—such as the ocean sunfishes—primarily consume soft-bodied invertebrates like jellyfish. Other species, such as boxfishes, use jets of water to expose burrowing invertebrates in the sand, while some triggerfishes specialize in hunting sea urchins or bivalves.1