Sandbar Shark

The Sandbar Shark (Carcharhinus plumbeus) is a large, heavy-bodied requiem shark in the family Carcharhinidae, best known for its unusually tall, triangular first dorsal fin. It has a worldwide distribution in temperate and tropical coastal waters, including major populations along the eastern United States, where estuarine bays serve as critical nursery habitat. One of the most extensively studied shark species due to decades of tagging programs, it plays an important ecological role as a mid-to-upper trophic level predator on continental shelves. Historically heavily fished for its fins, the species is now classified as Vulnerable in parts of its range and is subject to conservation management in several countries.

Key field marks:

• Very tall, triangular first dorsal fin positioned over or just behind the pectoral fins
• Robust, gray to grayish-brown body, whitish underside
• Long, broad pectoral fins
• Interdorsal ridge present between first and second dorsal fins
• Blunt, rounded snout shorter than mouth width

The exceptionally tall first dorsal fin is the single most reliable field mark separating it from similar requiem sharks such as the Dusky Shark.

Found circumglobally in temperate and tropical coastal and shelf waters, including the western Atlantic, Gulf of Mexico, Caribbean, Indo-Pacific, and Mediterranean. Prefers depths from the shoreline to about 100 m, favoring muddy or sandy bottoms over open reef. Juveniles rely heavily on shallow estuarine bays and river mouths as nursery grounds, such as Chesapeake Bay and Delaware Bay in the United States, while adults range more widely over continental shelves and undertake seasonal migrations tied to water temperature.

Sandbar Sharks are slow-growing, late-maturing, and long-lived, traits that make populations slow to recover from overfishing. They are generally solitary or loosely aggregated bottom-oriented foragers, feeding mainly on small bony fishes, rays, and crustaceans near the seafloor. Females use shallow bays as pupping and nursery grounds, giving birth to live young after an 8-12 month gestation, and juveniles remain in these nurseries for several years before moving offshore. Adults undertake seasonal migrations, moving toward the equator in winter and poleward in summer.