Blue Shark, Mavi Köpekbalığı (Turkish), Tintenfischhai (German)

The blue shark (Prionace glauca) is a cosmopolitan shark species characterized by its slender body, long pectoral fins, and distinctive blue-grey dorsal coloration that fades to a lighter underside. It has a streamlined body that allows for powerful and sustained swimming. They possess an excellent sense of smell and are adept at hunting in low-light conditions. Adults typically reach lengths of 1.8–2.1 meters (6–7 feet) and weigh 55–130 kilograms (121–286 pounds). They play an important role in the marine ecosystem as an apex predator.

Blue sharks are found in nearly all of the world's temperate and subtropical oceans. They are pelagic, meaning they live in the open ocean, typically found in waters between 20°N and 60°S. They can be found at depths ranging from the surface to over 1,000 meters (3,300 feet).

Blue sharks are ovoviviparous, meaning eggs are released but hatch internally, and the pups are born live. Gestation is thought to last around 12-18 months. Liters generally range from 5-15 pups. They are relatively fast-growing and mature slowly, typically reaching sexual maturity around 5-10 years of age. Blue sharks are migratory, often travelling long distances to feed and breed. They are preyed upon by larger sharks, seals, and occasionally other marine mammals.

Due to concerns about overfishing and the slow reproductive rate of blue sharks, their consumption is generally discouraged. While the meat is reported to be dark and oily, with a strong flavor, it is not widely consumed and is often considered low quality. Consumption is illegal or restricted in many regions.