Metal and metalloid concentrations in the tissues of dusky Carcharhinus obscurus, sandbar C. plumbeus and white Carcharodon carcharias sharks from south-eastern Australian waters, and the implications for human consumption

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Highlights

  • Metals were analysed in 12 sandbar, 12 dusky and 6 great white sharks.

  • Most samples have high concentrations of Hg and As, some higher than reported elsewhere (e.g. >80 mg kg−1 ww).

  • Two 120-gram serves per week of either commercial species exceeds the FSANZ PTWI for Hg and As.

  • Hg concentrations are significantly positively correlated with length in all species.

  • A 1.5 m size limit is recommended to ensure a product safe for human consumption.

Abstract

Shark fisheries have expanded due to increased demand for shark products. As long-lived apex predators, sharks are susceptible to bioaccumulation of metals and metalloids, and biomagnification of some such as Hg, primarily through diet. This may have negative health implications for human consumers. Concentrations of Hg, As, Cd, Cu, Fe, Se and Zn were analysed in muscle, liver and fin fibres (ceratotrichia) from dusky Carcharhinus obscurus, sandbar Carcharhinus plumbeus, and white Carcharodon carcharias sharks from south-eastern Australian waters. Concentrations of analytes were generally higher in liver than in muscle and lowest in fin fibres. Muscle tissue concentrations of Hg were significantly correlated with total length, and >50% of sampled individuals had concentrations above Food Standards Australia New Zealand’s maximum limit (1 mg kg−1 ww). Arsenic concentrations were also of concern, particularly in fins. Results warrant further investigation to accurately assess health risks for regular consumption of shark products.

Section snippets

Acknowledgements

Thanks are due to NSW Department of Primary Industries (DPI) for provision of samples from the OTLF through research conducted via support from the Fisheries Research and Development Corporation on behalf of the Australian Government, and the Shark Meshing Program. Sample collection was approved by NSW DPI Animal Care and Ethics Committee (Refs. 12/19 and 10/06), and approval for this study was granted by Southern Cross University Animal Care and Ethics Committee (Ref. 13/12). This study was

References (81)

  • D. Haynes et al.

    Organochlorine, heavy metal and polyaromatic hydrocarbon pollutant concentrations in the Great Barrier Reef (Australia) environment: a review

    Mar. Pollut. Bull.

    (2000)
  • I. Kalantzi et al.

    Metals and other elements in tissues of wild fish from fish farms and comparison with farmed species in sites with oxic and anoxic sediments

    Food Chem.

    (2013)
  • J. Kojadinovic et al.

    Mercury content in commercial pelagic fish and its risk assessment in the Western Indian Ocean

    Sci. Total Environ.

    (2006)
  • J.E. Marcovecchio et al.

    Biomagnification of total mercury in the Bahia Blanca estuary shark

    Mar. Pollut. Bull.

    (1986)
  • J.E. Marcovecchio et al.

    Metal accumulation in tissues of sharks from the Bahia Blanca estuary, Argentina

    Mar. Environ. Res.

    (1991)
  • B.C. McMeans et al.

    Essential and non-essential element concentrations in two sleeper shark species collected in Arctic waters

    Environ. Pollut.

    (2007)
  • H. Pethybridge et al.

    Mercury in 16 demersal sharks from southeast Australia: Biotic and abiotic sources of variation and consumer health implications

    Mar. Environ. Res.

    (2010)
  • M.M. Storelli et al.

    Polychlorinated biphenyl, heavy metal and methylmercury residues in hammerhead sharks: contaminant status and assessment

    Mar. Pollut. Bull.

    (2003)
  • P. Vas

    Trace metal levels in sharks from British and Atlantic waters

    Mar. Pollut. Bull.

    (1991)
  • P. Vas et al.

    Trace metals in deep-sea sharks from the Rockall Trough

    Mar. Pollut. Bull.

    (1993)
  • B. Worm et al.

    Global catches, exploitation rates, and rebuilding options for sharks

    Mar. Policy

    (2013)
  • D.H. Adams et al.

    Mercury levels in four species of sharks from the Atlantic coast of Florida

    Fish. Bull.

    (1999)
  • M.J. Anderson

    PERMANOVA: Permutational Multivariate Analysis of Variance

    (2005)
  • S.C. Apte et al.

    Baseline trace metal concentrations in New South Wales coastal waters

    Mar. Freshw. Res.

    (1998)
  • H. Bornatowski et al.

    Feeding ecology and trophic comparisons of six shark species in a coastal ecosystem off southern Brazil

    J. Fish Biol

    (2014)
  • V. Branco et al.

    Total and organic mercury concentrations in muscle tissue of the blue shark (Prionace glauca) from the north-east Atlantic

    Mar. Pollut. Bull.

    (2004)
  • Bruce, B., 2010. Review of Shark Catches in The NEW South Wales Ocean Trap and Line Fishery. Report to DEWHA. CSIRO...
  • R.B. Clark

    Marine Pollution

    (2001)
  • S. Clarke et al.

    Social, economic and regulatory drivers of the shark fin trade

    Mar. Res. Econ.

    (2007)
  • G. Cliff et al.

    Sharks caught in the protective gill nets off Natal, South Africa. 1. The sandbar shark Carcharhinus plumbeus (Nardo)

    S. Afr. J. Mar. Sci.

    (1988)
  • E. Cortes

    Standardized diet compositions and trophic levels of sharks

    ICES J. Mar. Sci.

    (1999)
  • DEST, 1995. State of the Marine Environment Report for Australia: Pollution – Technical Annex 2. In: Zann, L.P.,...
  • S.F.J. Dudley et al.

    Sharks caught in the protective gill nets off KwaZulu-Natal, South Africa. 10. The dusky shark Carcharhinus obscurus (Lesueur 1818)

    Afr. J. Mar. Sci.

    (2005)
  • EA, 2002. White Shark Recovery Program. Environment Australia. Marine Conservation Branch,...
  • EAL, 2013. Salts and metals by ICPOES and ICPMS. Environmental Analysis Laboratory, Lismore,...
  • O. Escobar-Sanchez et al.

    Mercury and selenium bioaccumulation in the smooth hammerhead shark, Sphyrna zygaena Linnaeus, from the Mexican Pacific Ocean

    Bull. Environ. Contam. Toxicol.

    (2010)
  • S.E. Foran et al.

    Measurement of mercury levels in concentrated over-the-counter fish oil preparations: is fish oil healthier than fish?

    Arch. Pathol. Lab. Med.

    (2003)
  • FSANZ, 2002. The 20th Australian Total Diet Study. Supplementary Material: Part 1A....
  • FSANZ

    The 23rd Australian Total Diet Study

    (2011)
  • P.T. Geraghty et al.

    Age and growth parameters for three heavily exploited shark species off temperate eastern Australia

    ICES J. Mar. Sci

    (2013)
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