Environmental contamination of heavy metals in some dried fish of coastal regions of Bangladesh

  • Suny Akter Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh
  • Zeenath Fardous Institute of Food and Radiation Biology, AERE, Bangladesh Atomic Energy Commission, Ganakbari, Savar, Dhaka-1349, Bangladesh
  • Jesmin Aktar Department of Biology, Savar Government College, Savar, Dhaka, Bangladesh
  • Md Abdur Rahman Institute of Food and Radiation Biology, AERE, Bangladesh Atomic Energy Commission, Ganakbari, Savar, Dhaka-1349, Bangladesh
  • Muhammed Alamgir Zaman Chowdhury Institute of Food and Radiation Biology, AERE, Bangladesh Atomic Energy Commission, Ganakbari, Savar, Dhaka-1349, Bangladesh
  • Shilpi Sarkar Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh
  • Md Baki Billah Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh
Keywords: Pollution, heavy metals, dried fish, coastal regions

Abstract

Heavy metals are non-biodegradable substances which cause serious carcinogenic effects on animals and humans. As fish occupy top position of aquatic food chain, it is a major source of heavy metal contamination. The concentration of Cd, Cr, Pb, Mn, Fe, Cu, and Zn were 0.0156 - 0.1428, 0.163 - 8.53, 0.0924 - 0.4026, 9.38 - 65.9382, 0.0473 - 0.1981 and 0.1473 - 1.8148 ppm respectively for the fish samples of Cox’s Bazar region while 0.0191 - 0.1386, 0.8445 - 0.1743, 0.102 - 0.4625, 0.102 - 0.4675, 9.7269 - 60.5267, 0.3108 - 0.046 ppm for the fish samples of Saint Martin’s region. Comparatively high concentrations of heavy metals were found to be accumulated in Mola (Amblypharyngodon mola), Rupchanda (Stromateus chinensis) and Chhuri (Trichiurus lepturus). The order of heavy metal concentrations were Fe > Zn > Cr > Cu > Mn > Cd. The concentration of heavy metals varied from species to species and most of the metals were not significantly correlated, even some metals showed negative correlation among them. Concentration of Fe in some fishes (Mola, Rupchanda and Chhuri) was found higher than WHO guideline values, while other metals exhibited the value below the WHO standard. The results of this study will assist in acquiring information about the level of toxic metals in these regions and to improve the coastal management in these areas in future.

Bangladesh J. Zool. 47(2): 293-304, 2019

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Abstract
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Published
2019-12-12
How to Cite
Akter, S., Fardous, Z., Aktar, J., Rahman, M. A., Chowdhury, M. A., Sarkar, S., & Billah, M. B. (2019). Environmental contamination of heavy metals in some dried fish of coastal regions of Bangladesh. Bangladesh Journal of Zoology, 47(2), 293-304. https://doi.org/10.3329/bjz.v47i2.44340
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Articles