Sealife guideThe blue sharkPrionace glauca

The blue shark (Prionace glauca)
Taxonomy
- Common name: Blue shark
- French name: Requin bleu, peau bleue
- Scientific name: Prionace glauca (Linnaeus, 1758)
- Family name: Carcharhinidae
- Order name: Carcharhiniformes
- Class name: Elasmobranchii
Description
The blue shark is a pelagic shark with a maximum size of about 12.5 feet in length and a weight of around 440 pounds.

The blue shark has a long pointed nose !
The blue shark is characterized by its bluish coloration on the top side of its very slender body. It also has a long, pointed nose and long pectoral fins.
Range
The blue shark is widely distributed in temperate and tropical waters across the world’s seas and oceans. It is likely the most widespread shark in the oceans, found almost everywhere except the cold waters of the polar oceans.
Blue shark migration is seasonal and depends on the distribution and abundance of their prey.
Habitat
Blue sharks can be found from the surface down to depths of over 1,150 feet. Since they prefer water temperatures around 54 to 68°F, their depth range varies accordingly. In tropical waters, where temperatures are higher, blue sharks are typically found at greater depths !
The blue shark is a pelagic and oceanic species that generally lives a solitary life offshore.
Diet
As a major predator, the blue shark plays a key role in maintaining the balance of the marine ecosystem. It primarily feeds on small pelagic fish, squids, pelagic crustaceans, and occasionally on seabirds or marine mammal carcasses. While it can feed during the day, it is more active in searching for food at night.
Reproduction
The blue shark is viviparous. After a gestation period of 9 to 12 months, the female gives birth to an average of 30 pups, and occasionally more than 100 in exceptional cases, each measuring 14 to 20 inches in length. Young blue sharks reach sexual maturity at around 4 to 6 years of age with lengths ranging from 5.9 to 7.2 feet !
The growth rate of the blue shark is among the fastest of any shark species.
Did you know ?
The blue shark is listed as many other marine species within The IUCN Red List of threatened species. The blue shark appears in the IUCN Red List since 2019 within the category Near Threatened !

The blue shark (Prionace glauca) © Ethan Daniels | Dreamstime.com
Within the same family

Blacktip shark
(Carcharhinus limbatus)
(Carcharhinus limbatus)

Whitetip reef shark
(Triaenodon obesus)
(Triaenodon obesus)

Copper shark
(Carcharhinus brachyurus)
(Carcharhinus brachyurus)

Caribbean reef shark
(Carcharhinus perezi)
(Carcharhinus perezi)

Galapagos shark
(Carcharhinus galapagensis)
(Carcharhinus galapagensis)

Sandbar shark
(Carcharhinus plumbeus)
(Carcharhinus plumbeus)

Grey reef shark
(Carcharhinus amblyrhynchos)
(Carcharhinus amblyrhynchos)

Dusky shark
(Carcharhinus obscurus)
(Carcharhinus obscurus)
Explore also

Great hammerhead shark
(Sphyrna mokarran)
(Sphyrna mokarran)

Common angelshark
(Squatina squatina)
(Squatina squatina)

Blind shark
(Brachaelurus waddi)
(Brachaelurus waddi)

Port Jackson shark
(Heterodontus portusjacksoni)
(Heterodontus portusjacksoni)

Greenland shark
(Somniosus microcephalus)
(Somniosus microcephalus)

Leopard shark
(Triakis semifasciata)
(Triakis semifasciata)

Pyjama shark
(Poroderma africanum)
(Poroderma africanum)

Spotted wobbegong
(Orectolobus maculatus)
(Orectolobus maculatus)
Our latestUpdates

Monday, April 14th 2025
The bigeye trevally
The bigeye trevally has a silver-colored body with, as its name suggests, larger eyes compared to other trevally species. It is distinguished from other trevally species by the slightly yellowish color of its tail.

Monday, April 7th 2025
Best things to do in Miami
A flagship city of Florida, Miami is a dream destination where paradise beaches, a vibrant Latino atmosphere and a buzzing nightlife come together. With its year-round sunshine, iconic Art Deco architecture and dynamic cultural scene, Miami has everything to captivate travelers in search of escape.

Sunday, March 23rd 2025
The plumose sea anemone
The plumose sea anemone is a key species in temperate and cold marine ecosystems. Its high adaptability, morphological diversity and reproductive strategies make it a crucial organism for understanding biological and ecological interactions in marine environments.
Photo of the Day

Requin tapis barbu
(Eucrossorhinus dasypogon)
(Eucrossorhinus dasypogon)