The lateral line is a system of sense organs; neuromasts situated along/in the lateral line detect movement and vibration in water. The system is important in schooling and predatory behaviour, as well as in general for spatial awareness. It allows detection of movement outside of the range of vision, or in conditions that reduce visibility.
Blind fish will orientate towards movement in the same way as fish that are able to see, but disruption of the lateral line also disrupts the response to movement.
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the lateral line in a fish is basically a large nerve extending down both sides of the fish. it detects small ripples in the water to alert the fish of prey and predators.
Yes, the lateral line is used to detect prey. All fish have a sensory in their scales that sense either movement or electricity from the other fish in the water.