Blue Lobsters are very rare.

Blue lobsters
Around one in two million lobsters is blue. A research study conducted by Professor Ronald Christensen at the University of Connecticut discovered that a genetic defect causes a blue lobster to produce an excessive amount of protein. The protein, and a red caratenoid molecule known as astaxanthin, combine to form a blue complex known as crustacyanin, giving the lobster its blue color [2].

Paul E. Smith
Knoxville, TN