Blue shark

The blue shark (Prionace glauca) is a slender, wide-ranging oceanic shark distinguished by vivid blue coloration and long pectoral fins.

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Carcharhinidae: Carcharhinidae is a family of ground sharks that includes requiem sharks and several oceanic species. The blue shark belongs to this family, alongside familiar requiem sharks.
Regional endothermy: Regional endothermy is the retention of metabolic heat in selected body regions above surrounding water temperature. Blue sharks do not use this specialized heat-retention strategy; the contrast clarifies their physiology.
Shark finning: Shark finning is the removal of a shark's fins, often followed by discarding the body at sea. Blue sharks are frequently caught for their fins in commercial fisheries.
Prionace: Prionace is a genus of requiem sharks containing the blue shark as its sole living species. The blue shark is the sole extant member of this genus.
Pelagic zone: The pelagic zone is the open water of oceans, away from the seafloor and shore. Blue sharks spend most of their lives in this open-water realm.
Shark locomotion: Shark locomotion is swimming powered chiefly by body undulation and fin control. Its slender body and long pectoral fins shape its efficient cruising movement.
Bycatch: Bycatch is the unintended capture of species during fishing directed at other targets. Longline and other fisheries catch blue sharks even when sharks are not the target.
Shortfin mako shark: The shortfin mako (Isurus oxyrinchus) is a fast, warm-bodied oceanic shark with a pointed snout. It shares offshore habitat with blue sharks but is more robust and built for speed.
Shark: Sharks are cartilaginous fishes with multiple gill slits and replaceable rows of teeth. The blue shark is one species within this diverse group of fishes.
Ampullae of Lorenzini: Ampullae of Lorenzini are electroreceptive organs that detect weak electric fields in water. These organs help blue sharks detect electrical signals from prey.