The Porbeagle Shark

The porbeagle shark can weigh up to 225kg (with the notable exception of the 7m terror you'll meet later) and can grow up to 3.7m (once again not counting the 7m terror). The porbeagle lives at depths of 370m below the surface except when feeding. It lives mainly in the cold waters of the Atlantic Ocean and the North Sea.
It feeds on mackerel and squid. If there are no mackerel or squid in it's territory (or the under-sea restaurant has run out due to a busy evening) it will eat cod, hake and flounders.
Like other mackerel sharks (great whites, makos, Salmon sharks...)it has to keep swimming to survive.
The porbeagle, like other mackerel sharks, is warm blooded which gives it increased muscle strength.

A porbeagle shark feeding