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Batrachocottus baicalensis, endemic to Lake Baikal, Russia, has wider lateral line canals thanParacottus kneri, which also inhabits Siberian streams. In quiet waterB. baicalensisresponded to amphipods at a greater distance than didP. kneri.Batrachocottus baicalensisalso moves less often from search positions than doesP. kneri. Fish responded to faster moving prey at a greater distance than slower...