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One in 2-5 million lobsters are blue. A genetic defect causes a blue lobster to produce an excessive amount of protein. The protein and a red carotenoid molecule known as astaxanthin, combine to form a blue complex known as crustacyanin, giving the lobster its blue color.

One in 2-5 million lobsters are blue. A genetic defect causes a blue lobster to produce an excessive amount of protein. The protein and a red carotenoid molecule known as astaxanthin, combine to form a blue complex known as crustacyanin, giving the lobster its blue color.