Crayfish (scientific name: Procambarusclarkii): It is an aquatic animal of crustacea, Decapoda and crayfish. Crayfish usually carry paragonimiasis, also known as Procambarus clarkii, red crayfish and freshwater crayfish. Shaped like a shrimp with a hard shell The adult is about 5.6- 1 1.9 cm long, dark red, with nearly black carapace and wedge-shaped stripes on the ventral back.