Spinner Shark

• Maximum length3 m (10 ft); most adults about 2 m
• WeightUp to about 90 kg (200 lb); adults usually 50–60 kg
• Lifespan15–20 years
• Depth rangeSurface to 100 m (330 ft), mostly under 30 m
• DietSardines, herring, anchovies, mullet, squid, small sharks and rays
• IUCN statusVulnerable (assessed 2020)

How to tell a spinner shark from a blacktip

Almost every spinner shark that is misidentified is called a blacktip, and the two species share beaches, prey and black fin tips, so the differences are worth learning. Start at the front: the spinner's snout is longer and comes to a narrower point, and its eyes are noticeably small. Then look at the first dorsal fin, which is smaller than a blacktip's and begins behind the free rear tips of the pectoral fins rather than over their base. There is no ridge on the back between the dorsal fins.

The fin tips settle it in adults. A grown spinner shark has black tips on the pectorals, the second dorsal, the lower tail lobe and the anal fin; the blacktip's anal fin is plain white. The catch is that spinner pups are born without any black markings and acquire them at around 70 cm, so a small unmarked shark can be either species. Colour otherwise is grey to bronze above, white below, with a faint pale band along the flank.

Teeth are the last check. The upper jaw carries 15 to 18 narrow, upright, finely serrated teeth on each side and the lower jaw 14 to 17 smooth-edged ones, a set built for grabbing small fish rather than cutting chunks from large prey like the broad teeth of a bull shark. The body is slim and streamlined, and a big spinner is visibly leaner than a sandbar or dusky shark of the same length.

How big do spinner sharks get?

The largest spinner sharks on record are about 3 m (10 ft) long, and the heaviest reliably weighed was close to 90 kg (200 lb). A typical adult is about 2 m and 50 to 60 kg. Size depends on where the shark lives: the population of the north-western Atlantic and Gulf of Mexico rarely passes 2.5 m, while sharks from the Indian Ocean and off South Africa grow larger and mature later.

Pups measure 60 to 75 cm at birth. In the western Atlantic males mature at about 1.6 to 1.7 m and four to five years, females at 1.7 to 1.8 m and seven to eight years; off southern Africa males need around 1.8 to 2 m and seven to eight years and females about 2.1 m and roughly 13 years. The old figure of 12 to 14 years for all spinner sharks is therefore only right for the slowest-growing populations. Females are slightly larger than males as adults. The oldest sharks aged from vertebral bands were in their late teens. The bar below compares the maximum length with a diver.

Where spinner sharks live

Spinner sharks live on warm continental shelves, mostly in water shallower than 30 m and never much below 100 m. In the western Atlantic they range from North Carolina through the Gulf of Mexico and the Caribbean to southern Brazil, with the biggest numbers off Florida, the Carolinas and the Gulf coast of Texas and Louisiana. In the eastern Atlantic the species runs from Spain and Morocco to Namibia and is established across the Mediterranean, where it is one of the few requiem sharks that breeds. The Indo-West Pacific population covers the Red Sea, the east African coast, the Arabian Sea, India, Indonesia, southern Japan and northern Australia. It does not occur in the eastern Pacific.

Habitat shifts with age. Pups and juveniles keep to shallow bays and beaches where predators are fewer, and adults work the surf zone and the open shelf, following schools of baitfish. Along the US Atlantic coast the sharks move north in spring and back south into the Gulf and Florida in autumn, and in the north-western Atlantic the whole population winters in deeper, warmer water offshore. Off KwaZulu-Natal they follow the sardine run each winter. Water temperature is the constraint: spinners are rarely found below about 20 °C.

What spinner sharks eat and the spinning leap

Spinner sharks are specialists in small schooling fish. Sardines, herring, anchovies, mullet, menhaden, jacks, bluefish, bonito, sea catfish, lizardfish and tongue-soles all appear in stomach studies, along with squid, cuttlefish and octopus, and occasionally small sharks and stingrays. The narrow, grasping teeth match the menu: fish are swallowed whole.

The famous leap is a hunting technique, not play. A spinner shark attacks a school from below, accelerating straight up through the packed fish while rotating around its own axis and snapping as it goes, so that the spin carries the open jaws through as many fish as possible. The momentum often carries the shark clear of the surface, still turning, and it may complete three rotations before it falls back. Blacktips do the same thing, which is another reason the two are confused, but spinners do it more often and more spectacularly, especially in the autumn mullet migration along Florida and the Gulf coast.

They feed in groups, and a shoal of spinners on a bait ball can churn the surface for minutes at a time. They are also regulars behind shrimp trawlers, where discarded bycatch pours over the side, and this habit of rushing anything that looks like food in murky water is the root of most of their bites on people.

Behaviour, senses and migration

Spinner sharks are fast, active and sociable. They travel in schools that are often sorted by size and sex, with juveniles together in the shallows and adults in mixed groups further out. When bait is dense they feed in a frenzy, and it is in that state, with visibility cut by sand and blood, that they take a hand or a foot by mistake. Away from food they are timid, and divers in clear water usually see them only briefly.

Like the other requiem sharks they must swim to breathe, and they cover a great deal of water. Tagging along the US east coast shows a regular seasonal migration: north along the Carolinas and Virginia in spring and summer, south to Florida and into the Gulf of Mexico in autumn, with the north-western Atlantic population moving offshore into deeper water for the winter. In the Mediterranean the sharks appear in the warm eastern basin in summer, off Israel, Cyprus and Turkey.

Their senses are tuned for hunting fish in turbid water. The lateral line reads the pressure waves of a moving school, the inner ear picks up low-frequency sound, and the electrical sense in the snout, the ampullae of Lorenzini, finds prey at close range when the eyes cannot. Speed does the rest, though no reliable figure for the top speed of a spinner shark has been published.

Reproduction and lifespan

The spinner shark is viviparous with a yolk-sac placenta. The embryos live off their yolk for the first months, then the empty yolk sac attaches to the uterine wall and the mother supplies the pups directly until they are born at 60 to 75 cm. Litters range from 3 to 15, most often 6 to 10, and gestation lasts 11 to 15 months. Females breed every second year, using the intervening year to rebuild condition, which halves the rate at which the population can replace losses.

Mating takes place in spring and early summer and pups are dropped the following spring in shallow nursery grounds: bays and beaches of the northern Gulf of Mexico, the coast of South Carolina and Georgia, and the lagoons of the Indian River in Florida in the western Atlantic, and inshore waters off KwaZulu-Natal in the Indian Ocean.

Age is read from the growth rings in the vertebrae. Western Atlantic sharks mature at four to five years (males) and seven to eight years (females); Indian Ocean and South African sharks take seven to eight and about thirteen years respectively. The oldest aged animals were 17 to 20 years old, and the species is thought to live to about 20. Two-year breeding cycles, moderate litters and a decade to maturity in some populations make this a shark that cannot sustain heavy fishing, as our page on shark lifespans explains for the family generally.

How dangerous are spinner sharks to people?

The SharkSider database holds 50 incidents attributed to the spinner shark between 1944 and 2022, and not one was fatal. Forty-nine happened in the United States and one in South Africa; 39 involved surfers or people on boards and 11 involved swimmers or waders. The busiest decade was the 2000s, with 18 cases, and 35 of the 50 have occurred since 2000. The six most recent, listed below, are all from Florida and Alabama between 2019 and 2022 and every injury was a puncture or laceration to a foot, leg or arm.

Several of those records read "blacktip or spinner shark", and that phrase explains the whole pattern. In the murky surf of Florida, Alabama and the Carolinas, spinners and blacktips chase baitfish through the same breakers that surfers and bathers use, and a shark snapping at a flash of a foot or a hand takes one bite, realises its mistake and leaves. The wounds are real but small, and no one has died from one. It features on the Florida attack record mostly because Florida has more people in the water than anywhere else.

The precautions follow from the cause. Stay out of the surf when bait schools are being chased, especially at dawn and dusk during the autumn mullet run, avoid swimming near people fishing or near trawlers dumping bycatch, and leave the water if sharks are seen leaping. Our guide to surviving a shark attack covers the rest.

Spinner Shark incidents in the SharkSider database

• Records attributed50
• Fatal0 (0%)
• Years covered1944–2022
• Since 200035 incidents, 0 fatal
• Most common activitySurfing & boards
• Most recordsUSA (49)

The six most recent records attributed to the spinner shark

• 6 January 2022 · Anna Maria Island, Manatee County, Florida, USAWing foil surfing — Punctures to legRecorded as: Blacktip or spinner shark · not fatal
• 22 December 2021 · Anna Maria Island, Manatee County, Florida, USAWing foil surfing — Punctures to legRecorded as: Blacktip or spinner shark · not fatal
• 10 July 2021 · Bathtub Beach, Martin County, Florida, USAPlaying — Right foot bittenRecorded as: Spinner shark, 4'? · not fatal
• 31 July 2020 · Orange Beach, Baldwin County, Alabama, USASwimming — Lacerations to foot and toesRecorded as: Blacktip or Spinner shark · not fatal
• 27 July 2019 · Jacksonville Beach, Duval County, Florida, USASurfing — Puncture wounds around left elbowRecorded as: Blacktip or Spinner shark · not fatal
• 12 March 2019 · Stuart Beach, Martin County, Florida, USABoogie boarding — Lacerations to right footRecorded as: Spinner shark · not fatal

Records are matched on the shark named in each report (“spinner”), so they include incidents where the species was reported rather than confirmed. Full records by country on the shark attacks pages.

Conservation status and fisheries

The IUCN Red List assessed the spinner shark as Vulnerable in 2020, with a decreasing global trend, on the basis of declines in the Indian Ocean, the eastern Atlantic and parts of Asia where it is fished without limits. Since November 2023 every species in the family Carcharhinidae has been on CITES Appendix II, so international trade in spinner shark fins and meat now requires export permits. The species is not listed under the Convention on Migratory Species.

Pressure comes from several directions. Spinner sharks are caught in gillnets, on longlines and by recreational anglers throughout their range, and their meat is sold fresh and dried, sometimes labelled as blacktip. The fins enter the Asian trade, the skin is tanned and the liver oil is used so little of a landed shark is wasted. Nursery grounds in shallow bays and lagoons are exposed to coastal development and pollution, and the bather-protection nets off KwaZulu-Natal take spinners every year.

Management is strongest in the United States, where the species is part of the large coastal shark complex under the Atlantic highly migratory species plan, with commercial quotas, a recreational size limit and a stock that appears stable. The Mediterranean and the north-west Indian Ocean have almost no species-specific rules. See why sharks are endangered and shark bycatch for the wider context.

Similar species and close relatives

The spinner shark sits within Carcharhinus, the largest genus of requiem sharks, in a group of slim, fast, small-toothed fish-eaters with black fin markings. Its closest relatives and closest look-alikes are the blacktip shark (Carcharhinus limbatus), separated by the plain anal fin and larger first dorsal fin described above, and the smaller finetooth shark of the western Atlantic, which has no black tips at all and more numerous, needle-like teeth. In Australian and Indonesian waters the Australian blacktip and in the Arabian Sea the smoothtooth blacktip occupy the same niche and can be told apart only by tooth counts and vertebral counts. The blacknose shark is smaller, with a dusky snout tip and no black fins.

Divers on coral reefs sometimes report spinners that were in fact blacktip reef sharks, a much smaller, reef-bound species with a bold black blotch on the first dorsal fin; the spinner is an open-shelf shark that seldom sits on a reef. Offshore, the silky shark shares the small first dorsal fin set behind the pectorals but has no black tips and a ridge between the dorsal fins. For the family as a whole see our introduction to requiem sharks.

• Finetooth Sharkspecies profile
• Australian Blacktip Sharkspecies profile
• Smoothtooth Blacktip Sharkspecies profile
• Blacknose Sharkspecies profile
• Blacktip Reef Sharkspecies profile
• Silky Sharkspecies profile

Written and reviewed by

SharkSider Editorial Team

A small team focused on researching sharks and making marine biology easy to understand. Every page is reviewed against current species records and the SharkSider attack database, and updated when new incidents or research appear.

Published July 26, 2022 · Last updated September 22, 2026 · 50 incidents attributed to the spinner shark in the SharkSider attack database (0 fatal), updated weekly.