Blue shark [20], blue shark [21] (Prionace glauca) - a species of cartilaginous fish from the carcharhinidae family, the only representative of the genus Prionace. In older ichthyological literature, it was also referred to as the gray shark [22] or the man-eater shark [22]. It lives in deep, temperate and tropical ocean waters. However, it prefers cooler waters. He is known for his long migrations, incl. from New England to South America. Although it swims sluggishly, it can move with considerable speed. Blue sharks are viviparous and the female gives birth to 25 to 100 young. It mainly hunts for fish and squid, although its prey may be larger animals. A species that is dangerous for humans due to the possibility of being bitten, even fatal.
