A crab gauge and cleaning tool with a base and a blade having an arched upper edge and a lower edge, a coupling for removably attaching the blade to the base such that when attached the blade extends upwardly from the base in a central area of the top surface and a blade storage for securing the blade to the base, and wherein the blade has a first mounting foot and a second mounting foot with the space between the mounting feet defining a measuring distance for measuring shellfish.