Crayfish is classified as a profundal zone organism
Step-by-step explanation:
The deep zone of a freestanding body of water is refereed as the Profundal zone. It lies beneath the vertical water zone, thermocline. It lacks oxygen and light which determines the type of organisms found here.
In aqua profundal zone, lives sea urchins and some types of crustaceans, like- lobsters, crayfish, crabs, prawns etc. The cray fish belongs to the anthropod taxon family of crustaceans. Most of them are animals of aqua region but it has parasitic and terrestrial animals also.