Blue Shark
Named for their steely blue color, this slender shark inhabits the deep waters of the world’s warm oceans.
Class: Chondrichthyes
Order: Carcharhiniformes
Family: Carcharhinidae
Genus: Prionace
Species: P. glauca
Common Names: Blue Shark, Great Blue Shark
Blue sharks live in the open ocean, in the upper areas of deep water zones, which is known as the epipelagic region. It prefers warmer waters, far out at sea, although in temperate areas it may be found closer to shore.
Blue sharks eat a variety of food, mostly invertebrates and fish, with squid being among their most commonly consumed food. They will also occasionally scavenge large mammals like whales if they find a carcass, and may sometimes prey on other small sharks or sea birds.
Due to their large size and formidable teeth, they have few predators, though they are sometimes eaten by larger sharks including great whites. They are also sometimes preyed upon by orcas and large seals.
Blue sharks are viviparous animals, meaning the young develop within the mother and are born live, rather than hatching from eggs. Pregnancy lasts from 9 months to one year.
The blue shark’s courtship ritual often involves males biting the females, which has led female blue sharks to develop much thicker skin than males.
Blue sharks follow the typical “shark” body shape, though notably more slender in build than most other sharks. Their pectoral fins are long and thin, and their snouts pointed.
The shark gets its name from the steely blue color of its upper body. This fades to a white below, giving the shark a counter-shaded coloration that helps camouflage it in the water when seen from above and below.
Blue sharks can grow up to 12 feet long and can weigh over 400 pounds.
Blue shark attacks on humans are extremely rare, with only about a dozen being reported in the last 500 years or so. Their deep water habitat means they don’t encounter human swimmers as much as other shark species, and they are typically not aggressive. They should still be considered dangerous, however, and like all wild animals should be treated with a healthy respect.
Blue sharks are not often kept in captivity. Like many open ocean species, they have difficulty adjusting to the aquarium walls, and will often collide with smooth surfaces. Few attempts have been made to keep blue sharks in aquaria, and these usually last for a few hundred days at most.
Blue sharks are a Near Threatened species. Though they are found in warm oceans worldwide, they still face threats due to the factors like climate change and pollution that damage the ocean. They are sometimes hunted for their skin, which is used to make leather, and their fins, which are used to make soup.
References
Castro, Jose I. (2011). The Sharks of North America. New York, New York: Oxford University Press, Inc.
https://en.wikipedia.org/wiki/Blue_shark
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