Blue lobsters live in salt water. They are a rare colour variation of the American lobster, Homarus americanus, which is found in the North Atlantic Ocean. Blue lobsters are typically a dark blue or purple colour, but they can also be light blue or even green. They are thought to occur due to a genetic mutation that affects the production of a protein called crustacyanin, which is responsible for the lobster's colour. Blue lobsters are just as edible as other lobsters, and they are considered to be a delicacy.
