Blue Shark
Prionace glauca

Physical Description:

  • A large, graceful, slim shark with large eyes
  • Usually dark blue in color with unmistakably long pectoral (side) fins
  • Name comes from their blue coloration, unique among sharks
  • Males reach a maximum length of 12 feet but usually around 9 feet in length
  • Females reach a length of 7 feet in length
  • Mature females often have bite scars from mating


  • Worldwide oceans


  • Live in temperate and tropical seas
  • Found in the open ocean far from the coasts


  • During most of year males and females live in different regions of ocean
  • Travel long distances to come together briefly during mating season
  • Mating is via internal fertilization
  • Males may bite females aggressively during mating so females have thick protective skin
  • Females give birth to live young after 9-12 months
  • Litters can be up to 100 pups, though rarely that large


  • Primarily small squid, as well as crustaceans, small to large fish, seabirds, and even other, smaller species of sharks


  • Orcas, larger sharks, such as the great white shark and shortfin mako shark¬†

Interesting Facts:

  • Blue sharks are possibly the most wide-ranging shark in the world.
  • The Blue shark can travel tens of thousands of miles in a year, and can travel across whole ocean basins multiple times in their lifetime.
  • They use their large pectoral fins to ride the currents to conserve energy while migrating.

Sources: Sharks of the World: An annotated and illustrated catalogue of shark species known to date; Oceana; Newfoundland Department of Fisheries and Aquaculture; NOAA SWFSC;

Photo: Walter Heim

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