16A It is also unclear exactly how fish manage to maintain their tight formations. 16B Sight seems to play a role in the ability of fish to move in school, and some scientists believe that, at least in some species, sight may play the principal role. 16C However, many experiments indicate that more than sight is involved. Some fish school quite well in the dark or in murky water where visibility is extremely limited. 16D This indicates that senses other than eyesight must be involved in enabling the schooling behavior. The lateral line system most likely plays a significant role in the ability of fish to school. Because these lateral line organs are sensitive to the most minute vibrations and currents, this organ system may be used by fish to detect movements among members of their school even when eyesight is limited or unavailable.