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Methylmercury and Total Mercury in Eels, Anguilla anguilla, from Lakes in Northeastern Poland: Health Risk Assessment

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Abstract

In the aquatic environment, mercury is readily methylated into its most toxic form of methylmercury. In this form, it enters the aquatic food chain and its concentrations increase in subsequent links, which decreases the quality of fish meat and poses risks to consumer health. Concentrations of methylmercury (MeHg) and total mercury (THg) were determined in the muscle tissues of 64 eel specimens measuring from 59 to 95 cm in length as functions of specimen size and weight. Risks posed to consumers by eel from different length classes were also assessed. The mean concentration of THg in all of the eel examined was 0.179 mg kg−1, but the range was from 0.028 to 0.487 mg kg−1. The mean concentration of MeHg was 0.147 mg kg−1, and the range was also wide from 0.023 to 0.454 mg kg−1. Accumulated MeHg and THg increased with eel body length. The percentage share of MeHg in THg also changed with specimen length, and there was a positive correlation between the concentrations of MeHg and THg. Risk assessment was performed based on the doses of THg and MeHg ingested with fish for several specimen length classes. Consuming the meat of eel measuring 80 cm in length increased the estimated weekly intake (EWI) of THg and MeHg twofold in comparison to that from specimens 60 cm in length and fourfold in specimens exceeding 90 cm in length. The percentage shares of the EWI in the tolerable weekly intake and the target hazard quotient coefficient also increased proportionally. Generally, concentrations of MeHg and THg in eel are below current limits and pose no risk to consumer health as long as the consumption of larger specimens is avoided.

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Funding

The study was supported by a Grant from the National Science Centre (contract 2011/01/B/ST10/05398).

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Authors and Affiliations

  1. Department of Food and Environmental Chemistry, National Marine Fisheries Research Institute, ul. Kollataja 1, 81-332, Gdynia, Poland

    Lucyna Polak-Juszczak

  2. Department of Monitoring and Logistics, National Marine Fisheries Research Institute, ul. Kollataja 1, 81-332, Gdynia, Poland

    Tomasz Nermer

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  1. Lucyna Polak-Juszczak
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Correspondence to Lucyna Polak-Juszczak.

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Polak-Juszczak, L., Nermer, T. Methylmercury and Total Mercury in Eels, Anguilla anguilla, from Lakes in Northeastern Poland: Health Risk Assessment. EcoHealth 13, 582–590 (2016). https://doi.org/10.1007/s10393-016-1139-3

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