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Study on the Accumulation of Heavy Metals in Shallow-Water and Deep-Sea Hagfishes

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Abstract

Hagfish, the plesiomorphic sister group of all vertebrates, are scavengers, and many of them live at depths reaching thousands of meters. They are caught for use as food and serve as a substitute for leather in crafts in Asian hagfisheries. At present, the amount of various pollutants present in hagfishes from bioaccumulation through the food chain is unknown. To understand the bioaccumulation characteristics of heavy metals in deep-sea scavengers, selected heavy metals, including iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), cadmium (Cd), mercury (Hg), and lead (Pb), were analyzed and compared in two hagfish species, Paramyxine nelsoni (Pn) (found at approximately 200 m) and Myxine formosana (Mf) (found at approximately 850 m) caught in southwestern Taiwanese waters. Hagfish muscle (PnM and MfM) and liver (PnL and MfL) samples were lyophilized, and their metal levels were then analyzed using an inductively coupled plasma mass spectrometer. The metals with the highest levels in Pn tissues included Cu and As (PnL > MfL and PnM > MfM); in contrast, those that were higher in Mf tissues were Cd, Hg (both MfL > PnL and MfM > PnM), and Zn (MfM > PnM). Multivariate analyses, i.e., principle component analysis and partial least squares for discriminant analysis of metal levels were able to clearly separate these four tissue types into two groups corresponding to the two species: Pn and Mf. The present data also show differences in the levels of certain heavy metals in these tissues of the two hagfish species. These differences might have resulted not only from depth-related environmental factors but also from different species’ accumulation characteristics. Fe, Cu, and Hg concentrations were much higher in hagfish muscle than have been found in other fishes from adjacent polluted regions, and Hg was approximately 10- to 100-fold higher in hagfish muscles. Public health issues related to the consumption of hagfish are also discussed.

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Acknowledgments

This research was supported by a National Science council grant (Grant No. NSC96-2621-B-110-003-MY3) to H. K. M. We thank S. J. Jiang of the Chemistry Department and Joint Center for High Valued Instruments and National Sun Yat-Sen University for helping with the heavy-metal analyses. We also appreciate Y.C. Liu and H. Lee-Lin for their assistance at refining the figure drawings.

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Correspondence to Hin-Kiu Mok.

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Chiu, KH., Mok, HK. Study on the Accumulation of Heavy Metals in Shallow-Water and Deep-Sea Hagfishes. Arch Environ Contam Toxicol 60, 643–653 (2011). https://doi.org/10.1007/s00244-010-9572-8

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  • DOI: https://doi.org/10.1007/s00244-010-9572-8

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