Concentration of copper (Cu) in tinfoil barb fish (Barbonymus schwanenfeldii) of Kuantan River and Pinang River, Pahang, MalaysiaNadzifah Yaakub, Shu Qi Choong and Wan Marlin RohalinE3S Web Conf., 158 (2020) 05003DOI: https://doi.org/10.1051/e3sconf/202015805003