Effects of Cd, Zn and Cd+Zn Combination on Osmoregulation of Tilapia (Oreochromis niloticus)

Article type: Research Article

Authors: Putranto, Trisnadi Widyaleksono Catur | Shinta, Dewi | Affandi, Mochammad | Soegianto, Agoes^{; *}

Affiliations: Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia

Correspondence: [*] Corresponding Author. agoes_soegianto@fst.unair.ac.id

Abstract: The objectives of this study were to evaluate the effects of cadmium (Cd), zinc (Zn) and Cd+Zn combinations on serum osmolality and ions in Oreochromis niloticus. A total of 60 O. niloticus with five fi sh per tank and two tanks per group were used during this experiment. Group I was held in media without metal (as control) and other groups were exposed to 7.5 mg/L Zn, 15 mg/L Zn, 2.5 mg/L Cd, 7.5 mg/L Zn + 2.5 mg/L Cd and 15 mg/L Zn + 2.5 mg/L Cd for 7 days. The osmolalities of fish exposed to Cd, Zn and Cd+Zn combinations were higher than the control. Fish exposed to 2.5 mg/L Cd presented the highest level of Na+ and Cl−, and the lowest level of K+. This study shows that the osmotic and ionic regulatory impairment is more pronounced in fish exposed to Cd than in Zn and Cd+Zn combinations. This phenomenon indicates that Zn plays a prominent role in suppressing the toxic effect of Cd on O. niloticus.

Keywords: Fish, cadmium, zinc, osmolality, ions, serum

DOI: 10.3233/AJW200035

Journal: Asian Journal of Water, Environment and Pollution, vol. 17, no. 3, pp. 49-53, 2020