The Common Yabby is an Australian Freshwater Crustacean where they are very common in slow-flowing or stationary bodies of water such as lagoons and back-waters. There are three sub-species: Cherax Destructor Destructor, Cherax destructor Albidus and Cherax Destructor Rotundus. An all-blue variation, called the Blue Pearl Lobster is perhaps the most common in home aquariums.