Lobster blue color occurs in approximately one of 2 million
Fisherman from Massachusetts (USA), caught in the Atlantic ocean rare blue lobster (American lobster). According to Wikipedia, lobster blue color occurs in approximately one of 2 million.
The color they acquire due to genetic mutations when a protein responsible for the blue color, is produced in large quantities.
This protein is along with a red carotenoid molecule forms a blue complex known as crustacyanin, which gives Omar blue color.