Mercury Bioaccumulation in Tropical Mangrove Wetland Fishes: Evaluating Potential Risk to Coastal Wildlife
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The present study, aimed at observing the total concentration of mercury (Hg) in edible finfish species with an implication to human health risk, was carried out from the Setiu mangrove wetlands on the east coast of Peninsular Malaysia. Out of 20 species observed, the highest Hg concentrations were found among carnivores-fish/invertebrate-feeders, followed by omnivores and carnivores-invertebrate-feeders, while the lowest concentrations in herbivores. The Hg concentrations varied widely with fish species and body size, from 0.12 to 2.10 mg/kg dry weight. A positive relationship between body weight and Hg concentration was observed in particular for Toxotes jaculatrix and Tetraodon nigroviridis. Besides the permissible range of Hg concentration up to 0.3 mg/kg (cf. United States Environmental Protection Agency (USEPA)) in majority of species, the carnivore feeders such as Acanthopagrus pacificus, Gerres filamentosus, and Caranx ignobilis have shown excess amounts (> 0.40 mg/kg flesh weight) that raising concerns over the consumption by local people. However, the weekly intake of mercury—estimated through the fish consumption in all three trophic levels—suggests that the present Hg concentrations are still within the range of Provisional Tolerable Weekly Intake (PTWI) reported by the Joint FAO/WHO Expert Committee on Food Additives (JECFA). Perhaps, a multi-species design for Hg monitoring at Setiu wetlands would be able to provide further insights into the level of toxicity transfer among other aquatic organisms and thereby a strong health risk assessment for the local communities.
KeywordsConsumption Wild fish Health risk Setiu wetland
The authors are grateful to staffs in the University Malaysia Terengganu (UMT) for their kind assistance in field work.
This work was supported by the Ministry of Higher Education Malaysia, under the Fundamental Research Grant Scheme (FRGS) project number FRGS/1/2016/WAB09/UMT/02/5 (No. 59425).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
The study was approved by the Ethical Biosecurity Committee in Institute of Oceanography and Environment, UMT. All procedures performed in studies involving animals were in accordance with the ethical standards of UMT.
- 1.Ruddle K (1981) Pollution in the marine coastal environment of the ASEAN countries. In: Sien CL, MacAndrew C (eds) South East Asian waters: frontier for development. McGraw-Hill International Book Co, Singapore, pp 136–176Google Scholar
- 2.Sloss L (2012) Mercury emissions from India and South East Asia. IEA Clean coal centre, 42 pp. Available from UNEPGoogle Scholar
- 3.U.S.EPA US Environmental Protection Agency (1997). Mercury study report to congress, vols. 1–8. Washington (DC), Office of Air Quality Planning and Standards and Office of Research and Development, Report no. EPA-452/R-97–005Google Scholar
- 7.Azmi M (2014) Valuing the potential economic value of mangroves resources in Setiu wetlands, Terengganu, Malaysia: a preliminary findings. Int J Educ Res 2:487–450Google Scholar
- 17.Ibrahim AB, Mohd Khan A, Norrakiah AS, Intan Fazleen Z (2014) Freshwater water aquaculture fish consumption in Malaysia and heavy metals risk exposure to consumers. Int Food Res J 21(6):2109–2113Google Scholar
- 22.Alina M, Azrina A, Mohd YAS, Mohd ZS, Izuan MEH, Rizal RM (2012) Heavy metal (mercury, arsenic, cadmium, plumbing) in selected marine fish and shellfish along the Strait of Malacca. Int Food Res J 19(1):135–140Google Scholar
- 25.Nakisah MA, Fauziah AH (2003) Setiu wetlands: tranquility amidst plenty Kolej Universiti Sains dan Teknologi Malaysia - KUSTEM, Kuala Terengganu, MalaysiaGoogle Scholar
- 27.Azmi M (2014) Valuing the potential economic value of mangroves resources in Setiu wetlands, Terengganu, Malaysia: a preliminary findings. Int J Educ Res 2:487–504Google Scholar
- 28.Jamilah MS (2013) Setiu wetlands state park: challenging task for UMT. INFOKUS UMT 12–15Google Scholar
- 29.Matsunuma M, Motomura H, Matsuura K, Shazili NAM, Ambak MA (2011) Fishes of Terengganu—east coast of Malay Peninsula, Malaysia. National Museum of Nature and Science, Universiti Malaysia Terengganu and Kagoshima University MuseumGoogle Scholar
- 30.Froese R, Pauly D (2016) FishBase. World Wide Web electronic publication. www.fishbase.org. Accessed 25 October 2017
- 31.USEPA (2009) Guidance for Implementing the January 2001 Methylmercury Water Quality Criterion. EPA 823-R-09-002. U.S. Environmental Protection Agency, Office of Water, Washington, DCGoogle Scholar
- 32.Malayasia Food Regulation (1985) Malaysian law on food and drugs. Malaysian Law Publisher, Kuala Lumpur, p 289Google Scholar
- 33.Joint FAO/WHO Expert Committee on Food Additives (JECFA) (2010) Summary report of the seventy-second meeting of JECFA. Rome. 16-25 February 2010. JECFA/72/SC: 55–64Google Scholar
- 34.European Commission (2006) Commission regulation No. 1881/2006, setting maximum levels for certain contaminants in foodstuffs. Off J Eur Union L364:5Google Scholar
- 36.FAO (2018) Fishery statistical collections: consumption of fish and fishery products. http://www.fao.org/fishery/statistics/global-consumption/en. Accessed 25 January 2018
- 37.Law AT, Singh A (1991) Relationships between heavy metal content and body weight of fish from the Kelang estuary, Malaysia. Mar Pollut Bull 13:217–218Google Scholar
- 41.Hall BD, Bodaly RA, Fudge RJP, Rudd JWM, Rosenberg DM (1997) Food as the dominant pathway of methylmercury uptake by fish. Water Air Soil Pollut 100:13–24Google Scholar
- 44.Ackerman JT, Hartman CA, Eagles-Smith CA, Herzog MP, Davis J, Ichikawa G, Bonnema A (2015) Estimating exposure of piscivorous birds and sport fish to mercury in California lakes using prey fish monitoring—a predictive tool for managers: U.S. Geological Survey Open-File Report 2015-1106: pp 48Google Scholar