"Speedy with an extra boost kick." - In-game descriptionThe Blue Shark is the fourth playable shark in Hungry Shark World. It is unlocked upon 100% growth of the xS shark, Blacktip Reef Shark.
The Blue Shark is the fourth smallest shark, and is overall the third weakest shark in the game.
It's the fastest of the S class sharks by a wide margin, and it's boost is very high, too. However, its bite and health stats are the lowest in the S shark group, even outclassed by cheaper sharks like the Whitetip Reef Shark or the Porbeagle.
It's clear that this shark is meant to be a very fast, while not very powerful, shark, able to easily escape predators and catch prey. However, its low bite and health mean that it's weaknesses are long fights versus two or more enemies, like groups of enemy sharks. In those situations, the best strategy is to use hit-and-run tactics, that are easy to perform thanks to it's high speed and boost, and low health drain. But in the Halloween update the blue shark's health was raised to 106, making him the second strongest small shark.