Total and organic mercury concentrations in the muscles of Pacific albacore (Thunnus alalunga) and bigeye tuna (Thunnus obesus) |
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| Authors: | Chiee-Young Chen Chien-Cheng Lai Kuo-Shu Chen Chien-Chung Hsu Chin-Chang Hung Meng-Hsien Chen |
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| Institution: | 1. Department of Environmental Engineering, National Kaohsiung Marine University, Kaohsiung 81143, Taiwan;2. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;3. Department of Oceanography and Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;4. Institute of Oceanography, College of Science, National Taiwan University, Taipei 10617, Taiwan;5. Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung 85243, Taiwan |
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| Abstract: | Muscles of 115 North Pacific albacore (ALB, Thunnus alalunga) and 75 Pacific bigeye tuna (BET, Thunnus obesus), collected from 2001 to 2006, were analyzed. No ALB, but 13 large BET had organic mercury (OHg) concentrations exceeding 1 μg g−1 wet weight. For both ALB and BET, total mercury (THg) and OHg concentrations were significantly and positively correlated with fork length (FL) and body weight. The muscle Hg bioaccumulation rates of BET were higher than those of ALB, particularly in the adult fish. Moreover, the lines had crossover points among the two species that imply the young BET (FL < 110 cm) contains lower muscle Hg concentrations than ALB of the same size. The suggested weekly dietary intake of ALB and small-BET meats is 340 g, and of BET meat it is 150 g for a 60-kg person based on the provisional tolerable weekly intake (PTWI) of methylmercury set by the WHO. |
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| Keywords: | Hg pollution Heavy metal Growth dilution Methylmercury Predatory fish Seafood safety |
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