title: Concentration and exposure assessment of mercury in commercial fish and other seafood marketed in Oman.
abstract: The results of this study present analytical data of the mercury levels in several fish and shellfish species to create awareness among individuals of the risks associated with consuming fish contaminated with mercury. Mercury concentrations varied from a mean of 0.02 mg/kg in Indian mackerel to 0.19 mg/kg in shark in both fresh and frozen fish, from 0.02 mg/kg in sardines to 0.18 mg/kg in skipjack tuna in canned fish, and from 0.02 mg/kg in Indian mackerel to 0.79 mg/kg in shark in dried fish. Shellfish contained a slightly higher amount of mercury than fresh or frozen fish with a mean of 0.09 mg/kg. Trophic position, followed by habitat, was the most important factors for variability in mercury concentrations in fish and shellfish. The maximum safe weekly intake (MSWI) values of mercury were significantly higher for herbivores than for carnivores. The MSWI value for total mercury in the case of consuming most (72%) fish species was more than 5 kg; however, the MSWI value was never more than 5 kg in most (66%) shellfish species. Risks were identified upon consumption of 120 g of dried shark when exceeding the provisional tolerable weekly intake threshold (1.6 μg/kg) for methylmercury. Therefore, fish-eating populations should reduce the quantity of dried shark to efficiently diminish the exposure to mercury.
authors.affiliation: Fishery Quality Control Center, Ministry of Agriculture and Fisheries Wealth, Post Box 427, Postal Code 100, Muscat, Sultanate of Oman.
authors.forename: Sabra
authors.initials: S
authors.lastname: Al-Mughairi
authors.forename: Poulose
authors.initials: P
authors.lastname: Yesudhason
authors.forename: Moza
authors.initials: M
authors.lastname: Al-Busaidi
authors.forename: Aaliah
authors.initials: A
authors.lastname: Al-Waili
authors.forename: Waleed A K
authors.initials: WA
authors.lastname: Al-Rahbi
authors.forename: Nashwa
authors.initials: N
authors.lastname: Al-Mazrooei
authors.forename: Saoud H
authors.initials: SH
authors.lastname: Al-Habsi
mesh_terms: D000818:Animals; D003257:Consumer Product Safety; D017753:Ecosystem; D004781:Environmental Exposure / Q000032:analysis*; D005399:Fishes; D005506:Food Contamination / Q000032:analysis*; D006801:Humans; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis; D009850:Oman; D011786:Quality Control; D017747:Seafood / Q000032:analysis*; D012758:Shellfish
chemical_list: D008767:Methylmercury Compounds; D008628:Mercury
keywords: Oman; canned fish; exposure assessment; fish consumption; mercury