The tiger shark (Galeocerdo cuvier) is the fourth-largest shark species and one of the most dangerous to humans — second only to the great white in documented unprovoked attacks. Named for the dark vertical stripes on juveniles that fade with age, tiger sharks are among the most voracious and indiscriminate predators in the ocean. They will eat almost anything: fish, turtles, dolphins, birds, license plates, and tires have all been found in tiger shark stomachs. This dietary flexibility, combined with their preference for shallow coastal waters where humans swim, makes them a species that commands serious respect.
Tiger Shark Size: How Big Do They Get?
Tiger sharks are large, heavy-bodied sharks. Adults typically measure 3.5–4.5 meters and weigh 385–635 kg. Females grow larger than males. The largest confirmed tiger shark measured 5.5 meters, and historical records claim individuals approaching 7 meters — though these are unverified.
Their body is distinctive: a blunt, broad snout, heavily keeled tail, and a stocky build that sets them apart from the more streamlined body plans of makos or great whites. The serrated, cockscomb-shaped teeth are unique among large sharks — curved with a secondary notch that allows them to saw through the hard shells of sea turtles with ease.
Where Do Tiger Sharks Live?
Tiger sharks are circumtropical — found in warm coastal and oceanic waters worldwide. They have one of the widest distributions of any shark species:
- Indo-Pacific: Throughout the Indian Ocean and Pacific, from South Africa to Hawaii
- Atlantic: From the US East Coast south through the Caribbean and across to West Africa
- Gulf of Mexico and Caribbean: Year-round residents in warm, shallow areas
- Hawaii: Tiger sharks are the primary large shark species in Hawaiian waters, responsible for the majority of shark encounters there
- Australia: Common along the Queensland coast and throughout tropical Australian waters
Tiger sharks prefer water temperatures above 21°C but will venture into cooler temperate regions seasonally. They are highly migratory, capable of covering hundreds of kilometers in days. Satellite tagging has tracked individuals from the Bahamas to mid-Atlantic and from Hawaii to the Pacific coast of North America.
What Do Tiger Sharks Eat?
Tiger sharks have the least discriminating diet of any large shark — a trait that has earned them the nickname “garbage cans of the sea.” Contents found in tiger shark stomachs include:
- Sea turtles — their heavy, serrated teeth are specifically adapted for crushing turtle shells
- Dolphins and porpoises
- Seabirds — including albatrosses caught on the surface
- Dugongs and manatees
- Stingrays and other sharks
- Bony fish, squid, and crustaceans
- Whale carcasses
- Garbage: license plates, tires, oil drums, coal bags, chickens, a suit of armor — all documented from stomach contents
This opportunism is a key survival advantage. Tiger sharks can exploit virtually any food source and have thrived while more specialist predators decline.
Tiger Shark Behavior
Tiger sharks are largely nocturnal hunters, moving into shallows at night to forage. During the day they typically patrol deeper water. Key behavioral characteristics:
- Bump and bite: Tiger sharks frequently bump prey with their snout before biting — sensory investigation that can feel alarming to humans
- Persistence: Unlike great whites, which often bite and release, tiger sharks tend to be more persistent once they begin feeding
- Solitary: Generally solitary, though they aggregate at feeding opportunities including whale carcasses and fish spawning events
- Curious: Tiger sharks are known for their boldness around divers — they approach closely and investigate, which requires careful management during dive encounters
Tiger Shark vs Great White: Key Differences
- Diet: Tiger sharks are more indiscriminate; great whites are more selective, focusing on marine mammals as adults
- Temperature preference: Tiger sharks prefer warmer tropical water; great whites prefer cooler temperate water
- Teeth shape: Tiger shark teeth are uniquely cockscomb-serrated; great white teeth are more broadly triangular
- Body shape: Tiger sharks are stockier with a more blunt snout; great whites are more torpedo-shaped
- Attacks on humans: Tiger sharks are #2 globally; great whites are #1
- Habitat: Tiger sharks more often in shallow tropical coastal water; great whites in cooler coastal and offshore water
Conservation Status
Tiger sharks are listed as Vulnerable on the IUCN Red List. Long considered abundant due to their wide range, tiger shark populations have declined significantly due to:
- Targeted shark fishing and finning
- Bycatch in longline fisheries
- Drum line and shark net programs at beaches in Australia, South Africa, and Hawaii — programs specifically targeting tiger sharks for human safety
Tiger sharks are slow to reproduce — females give birth every 3 years to litters of 10–80 pups after a 14–16 month gestation. This low reproductive rate makes population recovery slow when fishing pressure is high.
Key Facts
- Scientific name: Galeocerdo cuvier
- Maximum length: ~5.5 meters confirmed
- Maximum weight: ~635 kg typical; larger individuals reported
- Diet: Virtually anything — one of the least selective of all sharks
- Gestation: 14–16 months
- Litter size: 10–80 pups
- Conservation status: Vulnerable (IUCN)
- Human attacks: Second most attacks on record after great white
Frequently Asked Questions
Are tiger sharks more dangerous than great whites?
Great whites have more total unprovoked attacks on record globally. But in specific locations — Hawaii, Queensland Australia — tiger sharks are the primary species involved in shark incidents. Tiger sharks are considered more persistently dangerous once they begin an attack, while great whites more often bite and release.
Why do tiger sharks eat garbage?
Tiger sharks evolved as highly opportunistic scavengers and predators. Their sensory systems — particularly the lateral line and ampullae of Lorenzini — detect pressure changes and electrical fields, not just smell. Metallic or chemical signals from debris may trigger an investigatory response. The consummate opportunist, the tiger shark tests virtually anything as a potential food source.
How do tiger sharks hunt sea turtles?
Tiger shark teeth are uniquely adapted for turtle predation — the cockscomb serration saws through keratin shell material that would deflect a more pointed tooth. Tiger sharks target turtles from below and behind, biting through the shell or at exposed flipper joints. Turtle shell fragments are commonly found in tiger shark stomach contents.
Do tiger sharks travel in groups?
Tiger sharks are primarily solitary but aggregate at concentrated food sources. Multiple individuals have been tracked feeding on whale carcasses simultaneously. In Hawaii, seasonal aggregations of tiger sharks near seal pupping areas have been documented. These are not social groups — they are opportunistic gatherings around prey.