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Environmental Monitoring and Assessment

, Volume 186, Issue 3, pp 1931–1937 | Cite as

Mercury levels in myliobatid stingrays (Batoidea) from the Gulf of California: tissue distribution and health risk assessment

  • O. Escobar-Sánchez
  • J. Ruelas-Inzunza
  • J. C. Patrón-Gómez
  • D. Corro-Espinosa
Article

Abstract

With the aim of knowing Hg distribution in selected tissues of myliobatid stingrays and assessing health risk to Mexican population, Hg concentration was determined in the muscle and liver of four ray species. Total Hg levels were determined by cold vapor atomic absorption spectrophotometry. With respect to the muscle, devil rays (Mobula spp.) showed lower Hg levels (<0.22 μg g−1) than Rhinoptera steindachneri (0.37 ± 0.25 μg g-1 wet weight). In the case of the liver, the highest Hg concentration was found in Mobula japanica (0.22 ± 0.01 μg g−1). Hg levels in the muscle and liver varied according to the species; in some case, the liver accumulated more Hg than the muscle and the opposite pattern in other cases. R. steindachneri showed a significant difference between both tissues. No significant differences of Hg levels between males and females and between juveniles and adult specimens of R. steindachneri were found. Positive correlation between Hg concentrations and disc width and total weight was not significant for R. steindachneri (Rs < 0.36, p > 0.05). Batoids showed Hg values below the Mexican (NOM-027-SSA1-1993) limits (1.0 μg g−1) in fishes for human consumption. The species with the highest potential of Hg transfer to human population is R. steindachneri; however, an adult (70 kg) could consume approximately 943 g per week without representing a health risk. Nevertheless, further and continuous monitoring is needed since batoids support an important fishery in Mexican waters, being a food resource and income to coastal communities.

Keywords

Bioaccumulation Heavy metal Batoids Pacific Ocean Mexico 

Notes

Acknowledgments

OES is grateful to the Secretaría de Educación Pública (SEP) and the Instituto Tecnológico de Mazatlán (ITMAZ) for the post-doctoral scholarship granted through the Programa Mejoramiento del Profesorado (PROMEP). Artisanal fishing site visits were funded by Instituto Nacional de Pesca of Mexico. We thank PADI Foundation for the financial support for the laboratory analysis (application number 7759). We thank the fishermen of Sinaloa and Sonora States for their valuable help in the biological sampling. We thank L. A. Gustavo Andrade Domínguez of the Shark Program of the CRIP-Mazatlán for the technical assistance.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • O. Escobar-Sánchez
    • 1
  • J. Ruelas-Inzunza
    • 1
  • J. C. Patrón-Gómez
    • 1
  • D. Corro-Espinosa
    • 2
  1. 1.Instituto Tecnológico de MazatlánMazatlánMexico
  2. 2.Centro Regional de Investigaciones Pesqueras de MazatlánINAPESCAMazatlánMexico

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