The Cobalt Blue Lobster is one of the most striking ornamental crayfish you'll ever see. It will add an amazing splash of brilliant blue color that's sure to draw attention to your freshwater aquarium. The coloration of this blue beauty intensifies as it matures.Due to selective breeding, the Hammers Cobalt Blue Lobster will not lose this blue coloration, except in times of stress. The Hammers Cobalt Blue Lobster may arrive a brown coloration due to shipping stress but will eventually regain its bright blue coloration. They remain relatively small in the aquarium, only attaining a total length of five inches.