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This is a line of pores within each of that are open nerve endings that may detect slight actions within the water, produced for example by predators. The association of those organs in common lines allows the fish to detect the course and distance from which a disturbance in the water is coming. It was a line of pores inside each of which were open nerve endings that could detect slight movements within the water, produced by predators or different fish. The arrangement of these organs allowed to detect the direction and distance from which a disturbanc