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Lateral line

A line along each flank of the fish, clearly delineated by coloration or scale placement in some fish, unmarked and virtually invisible in others. The lateral line forms part of the fish's sensory organs, being composed of a series of mucus filled canals that are used to detect pressure variations and vibrations in the water, acting as an addendum to the hearing system, and can infact be used to escape from predators, and for finding prey.

Courtesy of Ben Spinks

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