The non-native freshwater fishes of Singapore: an annotated compilation Author Hui, Tan Heok Author Peng, Kelvin Lim Kok Author Huan, Liew Jia Author Wei, Low Bi Author Hing, Rayson Lim Bock Author Beng, Jeffrey Kwik Teik Author Yeo, Darren C. J. text Raffles Bulletin of Zoology 2020 2020-04-16 68 150 195 journal article 10.26107/RBZ-2020-0016 2345-7600 5343987 8AD77FDB-B04C-4E38-AA60-FE781A01273A Mystus wolffii (Bleeker) ( Fig. 55 , SEA[SPC]) Fig. 55. Mystus wolffii , ca. 200 mm SL, Upper Seletar Reservoir. References. Ng HH & Tan HH, 2010 ; Ng, 2012 ; Ng HH & Tan HH, 2013. Distribution. Lower Peirce Reservoir ( Ng HH & Tan HH, 2010 ); Upper Seletar Reservoir ( Ng HH & Tan HH, 2010 ). Remarks. Ng (2012) has clarified the status of Mystus wolffii in Singapore . The estuarine and dammed river-reservoir records probably represent native populations (i.e., Murai and Lower Seletar Reservoirs in Ng HH & Tan HH [2010] ; Punggol and Serangoon Reservoirs in Ng PX & Tan HH [2013] ), but the records from the inland reservoirs are probably non-native stock from raw water transferred from Johor , Peninsular Malaysia .