The genetic differentiation of Nile Tilapia, Oreochromis niloticus, is affected by chromium and lead in stabilization pond of municipal wastewater treatment
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Abstract
This study aims to determine the heavy metals concentrations in the Nile tilapia, Oreochromis niloticus, correlates with genetic differentiation in a fish cultured farm and a stabilization pond. The heavy metals including cadmium (Cd), chromium (Cr) and lead (Pb) concentrations were analyzed using induction coupled plasma-mass spectrometry. Genetic differentiation was studied by random amplified polymorphic DNA (RAPD) with dendrogram construction and analysis of genetic similarity (S). The results showed that the Cr and Pb concentrations in O. niloticus samples ranged from not detected to 0.025 ± 0.001 and not detected to 0.050 ± 0.002 mg/kg, in a fish cultured farm and a stabilization pond, respectively. The Cd concentrations not detected in all fish samples. RAPD was successfully applied to produce 877 total bands used for dendrogram construction and analysis of S. The dendrogram separated O. niloticus into two clusters corresponding to their studied area. The group of O. niloticus sample correlated with Cr and Pb concentrations. The Cr and Pb concentration in O. niloticus was low, it may still affect the genetic differentiation of fish. The genetic differentiation values within the individual fish samples ranged from 0.167 to 0.251 for samples from the fish cultured farm and 0.148–0.207 for samples from the stabilization pond. The genetic differentiation values of each individual fish sample ranged from 0.148 to 0.355. The genetic differentiation may be due to changes in the environment and genetic inheritance from parents of the fish in each sample.
Keywords
Genetic differentiation Chromium Lead Fish Oreochromis niloticusNotes
Acknowledgements
This research was funded by the Research Group on Toxic Substances in Livestock and Aquatic Animals, Faculty of Veterinary Medicine, Khon Kaen University. We also wish to thank the Molecular Systematics Laboratory at the Department of Biology, Faculty of Science, Khon Kaen University for DNA analysis. We are deeply grateful to Professor Dr. Arunrat Chaveerach for her helpful recommendation of our work.
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