Blue sharks are open water hunters, that have the perfect streamlined missile like shape for the open water. Not only does it have the shape, it has a way to hide with it's countershading camouflage(see camoflage). During the winter months blues live in the warmer, southen seas. But in the summer months it migrates as far north as the north sea.
They mainly hunt sardines, mackeral and other shoaling fish, they do this in groups and singly. Despite being hunters they will never let a free meal go, they have often been found scaveging on a whale carcass. But their more intellegent than that they go as far as following fishing boats out to sea, so they'll get the by catch and smaller fish that won't sell and are thrown overboard.

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