How many pairs of walking legs does a crayfish have?

In crayfish, 11 pairs of limbs are located on the cephalothorax. Of these, only 5 pairs of legs are walking, with the first pair modified into pincers. In total, there are five pairs of walking legs, but it moves only with the help of four, and the first pair of the crayfish hunts and defends itself. The remaining pairs of limbs are modified in the jaw and leg, with which the crayfish crushes its prey and moves it to the mouth. In addition, there are limbs on the abdomen, of which the very last, strongly flattened, forming the caudal fin participate in movement. With it, the cancer can move backward.