This paper briefly, reports a new record of the freshwater tiger perch, Mesoprites argenteus (Cuvier, 1829). This species has been found in downstream waters of eastern Taiwan, including: Mar-wu-ku Brook, King-lun Brook and Tung-chin Brook in Lanyu Island in Taitung County. The freshwater tiger perch can live in both fresh and brackish water, as a diadromous species. The diagnosis, distribution, remarks, key to species of this genus in Taiwan and color photos are provided within this paper.