Blue crayfish, often called electric blue or sapphire crayfish, are a color variation of the Procambarus alleni species, native to Florida. They get their vibrant blue color from a genetic mutation that causes them to produce excess astaxanthin, a pigment normally present in crustaceans. While wild-caught blue crayfish may be less common, aquarium strains have been selectively bred for this striking coloration. | Critters Of The World & Southern Outdoor Education