Extended data (BAUEC Ethical approval (University of Nairobi), a summary of the reagents and chemicals used, breakdown of the water, sediment and fish tissues sampled from the study sites, characteristics of the fish pond ecosystem, and statistical analysis)Extended data for the study on Levels of Mercury in Nile tilapia (Oreochromis niloticus), water and sediment in the Migori gold mining belt and the potential ramifications to human health

This data represents <br>1. The ethical approval form of the biosafety, animal use and ethics committee of the University of Nairobi.<br>2. A summary of the reagents and chemicals used in the analysis<br>3. A breakdown of the water, sediment and fish tissues sampled from the study sites<br>4. Characteristics of the ecosystems of the fish ponds where water, sediment, and fish were collected<br>5. Overview of the computed data (statistical analysis) <br>Ethical approval document for the study, a summary of the number of collected samples, reagents and chemicals, characteristics of the ecosystems in the fish ponds, ANOVA of the mean levels of mercury in brain, liver, and muscle tissues, and correlation between levels of mercury in water and sediments and those in fish tissues, and correlation between water pH, water temperature, weight, and age of fish, type of fish culture practiced and the levels of mercury <br>