# Thresher Shark (*Alopias vulpinus*)

> The thresher shark (Alopias vulpinus) is an open-ocean predator famous for its enormously long, whip-like tail, which can be almost as long as its body. Found in temperate and tropical seas worldwide, it can reach about 5 m in length including the tail and weigh 150 to 250 kg. It swims at up to 48 km/h and uses its tail to stun small fish and squid. The species lives up to 25 years and is listed as Vulnerable.

- **Category:** Fish
- **Conservation status (IUCN):** Vulnerable
- **Range:** Circumglobal in temperate and tropical open oceans — common threshers in Atlantic and Pacific.
- **Canonical page:** https://globalanimalguide.org/animals/thresher-shark/
- **Last reviewed:** 2026-07-16

## Scientific classification

- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Chondrichthyes
- **Order:** Lamniformes
- **Family:** Alopiidae
- **Genus:** Alopias

## Facts at a glance

| Attribute | Value |
| --- | --- |
| Scientific name | Alopias vulpinus |
| Diet | Carnivore — small fish and squid |
| Habitat | Temperate and tropical open oceans worldwide |
| Lifespan | 19–25 years in the wild |
| Weight | 150–250 kg (330–550 lb); tail adds length |
| Top speed | Up to 48 km/h (30 mph); tail slap stuns prey |
| Conservation status | Vulnerable (IUCN) |

## The whip-like tail

The thresher shark's most striking feature is its upper tail lobe, which is drawn out into a long, scythe-like whip that can be almost as long as the rest of the body. Counting the tail, an adult can measure around 5 m from nose to tip. Far from being decorative, this tail is a precision hunting tool honed for a single, remarkable technique. It gives the thresher a silhouette unlike any other shark in the open ocean.

## Tail-slap hunting

Thresher sharks hunt in a way seen in almost no other fish: they use the tail as a weapon. Swimming into a school of small fish, the shark throws its long tail forward over its head like a whip, striking and stunning several prey at once. It then circles back to swallow the dazed fish before they can recover. This overhead tail-slap is fast enough to create a crack in the water and lets a single shark disable many fish in one pass.

## Diet and open-ocean life

Thresher sharks are carnivores that feed mainly on small schooling fish such as mackerel, herring, and sardines, along with squid. They roam the temperate and tropical open oceans worldwide, often far from land, and can swim at speeds of up to 48 km/h in pursuit of prey. Powerful, warm-muscled swimmers, they sometimes leap clear of the surface. They tend to follow the movements of the baitfish schools on which they depend.

## Slow growth and reproduction

Like many large sharks, threshers grow slowly, mature late, and produce few young, which makes their populations slow to recover. Females give birth to a small litter of well-developed live pups rather than laying eggs. Unusually, the developing embryos practise oophagy, feeding on unfertilised eggs inside the mother before they are born. This life history means a thresher may live up to 25 years but replaces its numbers only gradually.

## Why it is vulnerable

The thresher shark is listed as Vulnerable by the IUCN because its numbers have declined across much of its range. It is caught both deliberately and as bycatch in commercial fisheries, valued for its meat, fins, and liver oil. Its distinctive long tail also makes it a target for sport fishing. Because threshers breed so slowly, populations struggle to rebuild once they have been overfished.

## Threshers and people

Despite their size and speed, thresher sharks pose very little danger to people and are considered timid, rarely approaching divers. They are far more threatened by humans than the other way around. Anglers prize them for their leaping fights when hooked, and they are an important food and fin species in many fisheries. Encouraging sustainable fishing and reducing bycatch are the key steps to safeguarding them.

## Frequently asked questions

### Why does the thresher shark have such a long tail?

The thresher shark uses its long, whip-like tail to hunt. It swings the tail overhead to strike and stun schools of small fish, then circles back to eat the dazed prey, making the tail a specialised feeding tool rather than just a means of swimming.

### How big do thresher sharks get?

Thresher sharks can reach about 5 m in total length, with the tail making up roughly half of that. They typically weigh between 150 and 250 kg (330 to 550 lb).

### What do thresher sharks eat?

They are carnivores that feed mainly on small schooling fish such as mackerel, herring, and sardines, as well as squid. They stun their prey with a whip of the tail before swallowing them.

### How fast can a thresher shark swim?

Thresher sharks can swim at speeds of up to 48 km/h (30 mph). They are powerful, warm-muscled swimmers that sometimes leap clear of the water when hunting.

### Are thresher sharks dangerous to humans?

No. Thresher sharks are timid and pose very little threat to people, rarely approaching divers. They are far more endangered by human fishing than they are a danger to us.

### Are thresher sharks endangered?

Thresher sharks are listed as Vulnerable by the IUCN. They are slow to breed and are caught for their meat, fins, and liver oil, so their populations recover slowly once overfished.

## Sources

- [IUCN Red List — Alopias vulpinus.](https://www.iucnredlist.org/search?query=Alopias%20vulpinus&searchType=species)
- [Animal Diversity Web — Alopias vulpinus. University of Michigan Museum of Zoology.](https://animaldiversity.org/accounts/Alopias_vulpinus/)

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Source: Global Animal Guide (https://globalanimalguide.org/animals/thresher-shark/). Licensed CC BY-NC 4.0 — free for non-commercial reuse with attribution.