🦷
Digestive Anatomy
Fish Teeth
Dentes
Highly variable feeding structures - from the dagger teeth of piranhas to the fused parrot-beak of parrotfish and the pharyngeal grinders of carp.
Region: Head Externally visible Unique to: all
📖 Overview
Fish teeth are as diverse as fish diets. Where mammals have a single set of teeth to last a lifetime, most fish continuously replace theirs - a shark can grow through 30,000 teeth in a lifetime. Piranhas have interlocking triangular blades. Parrotfish fuse their teeth into a coral-crushing beak. Carp and cichlids have pharyngeal teeth (a second set of teeth deep in the throat) for grinding. Some fish have no teeth at all - filter feeders like whale sharks and paddlefish rely on gill rakers instead.
🧬 Structure
True teeth are composed of dentin covered by enameloid. In sharks, teeth are placoid scales - dermal denticles - modified for feeding. Continuously replaced in rotating rows in most fish.
⚙️ Function
Prey capture (predators), scraping algae from rock (parrotfish, tangs), crushing shells (rays, drum), grinding plant material (carp), filtering plankton (whale sharks - no teeth needed).
🐠 Variations Across Species
Piranha: interlocking triangular blades. Great white shark: serrated cutting teeth. Parrotfish: fused beak. Wolffish: massive canines for crushing crabs. Anglerfish: inward-curving fangs. Manta ray: reduced or absent teeth.
✨ Fun Fact
A parrotfish can bite through solid coral. Its bite force per square inch approaches that of a wolf. The sand of tropical beaches is largely parrotfish poop - the ground remains of the coral they eat.
🔗 Related Digestive Structures