An Assessmental Study on the Determination of Heavy Metals in Sediment of Fish Farms in Bangladesh

An Assessmental Study on the Determination of Heavy Metals in Sediment of Fish Farms in Bangladesh

Despite scarce scientific work on revier sediemtn and fish in Bangladesh, heavy metal pollution of aquatic ecosystems is often most evident in sediments, but unfortunately no work has yet been published particularly on heavy metal contamination of fresh water fish farm sediments. In order to assess the environmental contamination of the selected fish farms in Mymensingh, Bangladesh, heavy metals in mud surface sediments have been found. Surface sediment samples (0-15 cm) were collected with a single core sampler from 20 fish farm ponds in February 2014 and analysed to measure the concentrations (mg/Kg DW) of zinc (Zn), lead (Pb), cadmium (Cd), nickel (Ni) and chromium (Cr). In the current analysis, the calculated concentration of heavy metals was in the order of Zn > Cr > Ni > Pb > Cd, which is very similar to other pond mud sediment results. The mean Zn, Pb, Cd, Cr, Ni concentrations observed in the present study were 208, 14.845, 0.009, 63.0544, 63.0544. And 58.665 mg/kg respectively, respectively. In total sediments, the range of measured concentrations (mg/kg) was 11.5-18.5 for Pb, 0.007-0.011 for Cd, 53.5-77.3 for Cr, 50.8-66.4 for Ni and 100-250 for Zn. In all sediment samples, the concentrations of Zn and Ni were above the guidelines of the US Environmental Protection Agency (USEPA) for highly polluted sediments and the concentration of Cr dropped below the moderately polluted range. As per USEPA, the metal concentrations of Pb and Cd are far below the controlled level. The study results therefore showed that the consistency of the pond mud sediment in the Mymensingh area could be regarded as highly and moderately contaminated for Zn, Ni and Cr, respectively.

Author (s) Details

Md. Jahangir Sarker
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Indrani Kanungo
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Mehedi Hasan Tanmay
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

Md. Shamsul Alam Patwary
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3814, Bangladesh.

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