The blue shark is one of the most abundant and far-ranging of all sharks and is a prolific breeder. Females sometimes litter as many as 70 pups. This is a slimly built fish with a 2 m specimen weighing only about 32 kg. Regarded by anglers as a sport fish, the current world angling record is 3.5 m and 186 kg.Sometimes known as the blue whaler because of its frequent presence at the scene of a whale kill, the blue shark is not reputed to be particularly dangerous to humans. These sharks become entangled in the nets set for mackeral, pilcher, and salmon. It has been known to attack humans, air and sea disaster victims in particular. Prionace glauca, the blue shark, is a large, pelagic, indigo-colored shark. It is a sleek shark with long, pointed fins, a pointed snout, and large eyes. Its sleek, tapered body makes it a graceful swimmer. Its elongated caudal fin provides swimming power as the tail moves side-to-side. The blue shark's sleek, tapered body makes it a graceful swimmer. Its elongated caudal fin (tail) provides swimming power as the tail moves side-to-side. These sharks are among the fastest swimming sharks and can even leap out of the water. They are also probably among the fastest fish. Estimates of their speed varies; some say that they can swim at about 60 miles per hour (97 kph), while more conservative estimates are about 22 mph (35 kph). There hasn't been enough experimentation on their speeds to have an definitive answer.
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