Spinner Shark

The Spinner Shark is a slender, fast-swimming requiem shark named for its remarkable spinning leaps while feeding on baitfish schools. It belongs to family Carcharhinidae and closely resembles the Blacktip Shark, though it can be distinguished by more extensively black-tipped fins including the anal fin. Adults typically reach 2-2.5 meters. Found in warm coastal and continental shelf waters worldwide, it is a notable predator of schooling fish and a species of interest in coastal shark studies. It is currently assessed as Vulnerable due to susceptibility to coastal fishing pressure across its range.

• Slender, elongated gray-bronze body with a long, pointed snout and small eyes
• Black tips present on the first dorsal, second dorsal, pectoral, pelvic, and anal fins
• Faint pale stripe often visible along the flank from pectoral to pelvic fin
• First dorsal fin origin set further back than in the Blacktip Shark, closer to the pectoral fin rear
• Small eyes relative to head size and a narrow, elongated caudal fin The black-tipped anal fin, absent in the Blacktip Shark, is the single most reliable field mark distinguishing these two very similar species.

Spinner Sharks occupy warm temperate to tropical coastal and continental shelf waters worldwide, ranging from the surf zone to depths of about 100 meters, though they are most frequently encountered in shallower nearshore waters. They undertake seasonal migrations, moving to higher latitudes during warmer months and returning to tropical waters in winter, notably along the southeastern and Gulf coasts of the United States. Juveniles use shallow coastal nursery grounds, while adults range more broadly across open shelf waters, often following large schools of baitfish along the coastline.

Spinner Sharks are renowned for their spectacular feeding behavior, charging vertically through dense baitfish schools while spinning along their body axis, often breaching the surface entirely before crashing back down. This high-speed hunting technique targets small schooling fish such as sardines, herring, and anchovies, along with squid. They often hunt cooperatively in groups during major baitfish migrations. Reproduction is viviparous, with females bearing litters of roughly 3-15 pups annually after an extended gestation of 12-15 months, using shallow nursery habitats for their young.