Fish have the five senses that people have, but have a sixth sense that is more than a sense of touch. Fish have a row of special cells inside a special canal along the surface of the fish's skin. This is called the "lateral line" which allows them to detect water vibrations. This sixth sense allows fish to detect movement around them and changes in water flow. Detecting movement helps fish find prey or escape from predators. Detecting changes in water flow help fish chose where to swim.