Shark livers are close to the size of the whole shark, and are full of fat, which the sharks rely on for flotation because they have no swim bladder like bony f

Shark livers are close to the size of the whole shark, and are full of fat, which the sharks rely on for flotation because they have no swim bladder like bony fish have. To be clear, shark livers are so big because they have an extra job ours don't.