Crayfish is a freshwater crustacean known to be part of the ancient sea creatures because of fossils found in Australia. They are part of the family of lobsters. In order to tell male and female crayfish apart, visual observation is necessary. First would be on the toughness of its swimmerets or the appendages on the bottom of the tail or abdomen. Female crayfish has softer swimmerets compared to the male crayfish. Male crayfish have hardened and enlarged swimmerets especially the two most anterior part. Most parts are clearly visible and defined among crayfish like its cephalothorax, carapace and telson.