Oceanic whitetip shark

What it is

This large requiem shark features a stocky body covered in grey-bronze skin that fades to white on the belly. Its most striking trait consists of elongated, wing-like fins with rounded white tips. Adults typically reach three metres in length and weigh around 150 kilograms, though specimens can exceed four metres. The species possesses a rounded snout and circular eyes protected by nictitating membranes. Two distinct tooth types aid in capturing prey: serrated triangular teeth in the upper jaw and thinner, serrated blades in the lower jaw.

Where it lives

The species inhabits tropical and warm temperate zones globally, spanning latitudes from 45 degrees north to 43 degrees south. It prefers deep offshore waters with temperatures above twenty degrees Celsius, though it tolerates cooler waters down to fifteen degrees. Populations are often denser further from land, yet individuals occasionally appear near continental shelves or islands at depths as shallow as thirty-seven metres. Historically abundant, recent data indicates severe population declines across all inhabited regions.

How it lives

These sharks generally swim slowly near the surface but accelerate during warmer summer months. They hunt alone or gather in groups when food concentrates, engaging in frenzied feeding behaviours. Their diet includes lancetfish, tuna, squid, and seabirds. They sometimes scavenge whale carcasses and compete with silky sharks. Pilot fish and remoras frequently accompany them. Evidence suggests they dive deeply to battle giant squid, indicated by sucker scars on their skin.

Breeding and life cycle

Females give live birth after a gestation period lasting nine months to one year. Embryos develop internally and receive nourishment via a placental sac. Litter sizes range from two to fourteen pups. Newborns measure between forty-five and seventy-five centimetres depending on the region. Sharks reach sexual maturity at lengths of approximately one point seven to one point nine metres, typically between four and seven years of age.

Fish and people

Historically feared by mariners, this shark has been linked to attacks on shipwreck survivors and swimmers. It is targeted commercially for its fins and meat, which are sold fresh, smoked, or dried. Skin is processed into leather. Captive specimens have survived for several years in aquarium settings. Conservation efforts include international trade restrictions under CITES and protection laws in various nations following drastic population drops.

Status and threats

The IUCN lists the species as critically endangered due to an estimated ninety-eight percent population decline. Overfishing for fins and meat, along with bycatch in longlines and gillnets, drives this collapse. Pollution, particularly mercury accumulation, poses additional threats. International trade is now heavily restricted under CITES Appendix I, and national protections exist in places like New Zealand and the United States.

Relatives and look-alikes

The oceanic whitetip is closely related to other requiem sharks within the genus Carcharhinus. It shares habitats and competes for food with silky sharks, often appearing alongside them. Taxonomic history involves confusion with names like Carcharhinus maou and Squalus longimanus before longimanus became standard. Fossil teeth from the Miocene and Pliocene epochs link it to ancient relatives in India, Italy, and Spain.

Questions people ask about Oceanic whitetip shark

Good reading and sources

• 'Historic' day for shark protectionBBC, Article
• Extinction: 'Time is running out' to save sharks and raysBBC, Article

• Oceanic whitetip shark on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data