Abstract
Three adult specimens of Scatophagus argus (Linnaeus, 1766) ranging from 223.0mm to 252.5mm in standard length were captured by gill nets from Urado Estuary in Kochi City. These specimens represent the first adult record of this species on the middle coast of Tosa Bay. A single S. argus juvenile, 25.0mm in standard length, from tidal zone of the Koso River in Konan City represents the easternmost record for this species on the coast of Tosa Bay.