Assessment of bioaccumulation factors of trace metals for Upper Gangetic fish

Abstract

The River Ganga basin is home to over 520 million people and 2500 species of flora and fauna, including several fish species. This study determines the bioaccumulation factors of fish for five trace metals, namely Cu, Fe, Zn, Mn, and Cr, in a stretch of the River Ganga in the upper Gangetic alluvial plain with limited industrial activities. The abundance of different trace metals in the water follows the order Fe > Zn > Mn > Cu > Cr. The concentrations in fish show a slightly different pattern and follow the relative quantitative order as Zn >≈ Fe >Mn > Cu >Cr. The trace metal levels in fish are well below the permissible limits set by various regulatory agencies. The bioaccumulation factor values are in order Zn>Cr>Mn>Cu>Fe. This stretch of the Ganga has not been extensively investigated for bioaccumulation by aquatic organisms. These values, therefore, represent site-specific baseline data for future anthropogenic activities that may affect the trace metal profile in this part of the Gangetic aquatic system. The study is also significant due to the presence of the Narora nuclear power plants, as the bioaccumulation factors of stable elements help predict the behavior of their radioactive counterparts and homologous elements in the environment.

Keywords

• bioaccumulation factor
• atomic absorption spectrometry
• trace metals
• River Ganga
• fresh water fish