Olatunji Ayotunde, E., Obeten Offem, B., & Bekeh Ada, F. (2012). Heavy metal profile of water, sediment and freshwater cat fish, Chrysichthys nigrodigitatus (Siluriformes: Bagridae), of Cross River, Nigeria. Revista De Biología Tropical, 60(3). https://doi.org/10.15517/rbt.v60i3.1807