Why are tetraodontiform fishes considered opportunistic invertebrate predators?

Tetraodontiform fishes are classified as opportunistic invertebrate predators because they possess diverse, specialized adaptations that allow them to exploit a wide range of food sources across various environments.1

While many species feature massive, fused teeth—often forming a parrotlike beak—designed to crush hard-shelled prey such as crustaceans, mollusks, and echinoderms, their feeding strategies are highly varied. For example:1

• Specialized Hunting: Boxfishes use jets of water to uncover burrowing prey, while triggerfishes are known to target spiny sea urchins or bivalves.1
• Soft-bodied Prey: Some species, including ocean sunfishes, feed extensively on soft-bodied invertebrates like jellyfish.1
• Probing: Certain species use their snouts to probe into holes or rocky recesses to reach food that is inaccessible to less-specialized fish.1

This combination of powerful, crushing jaws and the ability to forage in diverse niches allows the order to maintain a flexible diet, effectively acting as opportunistic predators on invertebrates.1