blue shark (by PaoloLora)
Fast Facts: Blue sharks ( Prionace glauca)
Blue sharks are large slender, pelagic (open water), blue-indigo-colored sharks. They are sleek sharks with long, pointed fins, pointed snouts, and large eyes. Blue sharks grow to be up to 4m long, averaging 3.35m, and can weigh up to 205.9kg.
Blue sharks are viviparous (their young are born live rather then from an egg). Their gestation period is almost one year.
The conservation status of the blue shark is Near Threatened (NT). A species is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.
“The earliest sharks date from more than 420 million years ago, before the time of the dinosaurs! The 400 species of modern sharks have evolved in various ways and scientists have classified them into the 8 major groups shown in this graphic. See how sharks fit into this family tree, from the most well-known sharks like the great white and tiger sharks, to the bizarre lesser-known sharks like the frilled shark, goblin shark and cookiecutter shark.”
Walhai Detail (by gabriela.meier)