Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks

  • Magdalena E. Bergés-Tiznado
  • Fernando Márquez-Farías
  • Raúl E. Lara-Mendoza
  • Yassir E. Torres-Rojas
  • Felipe Galván-Magaña
  • Humberto Bojórquez-Leyva
  • Federico Páez-Osuna
Article

Abstract

Selenium and mercury were evaluated in muscle, liver, kidney, brain, and the stomach contents of juvenile scalloped hammerhead shark Sphyrna lewini. Se:Hg molar ratios were calculated. The average Hg levels in muscle ranged from 0.12 to 1.17 μg/g (wet weight); Hg was <0.39 μg/g in liver and kidneys and <0.19 μg/g in brain. The lowest value of Se was found in muscle (0.4 μg/g) and the highest in kidney (26.7 μg/g). An excess of Se over Hg was found, with Se:Hg molar ratios >1. Correlations were found for Hg in muscle with size, age, and weight, and also for Hg in liver with size, age, and weight. Hg in muscle was significantly positive correlated to Hg in brain as well as Hg in liver was correlated to Hg in kidney. The highest Hg in preys was for carangid fishes; scombrid and carangid fishes contributed with the highest Se levels. Results suggest that more than 98 % of the total Hg and 62 % of Se end up in muscle and might be affected by factors, such as geographical area, age, size, and feeding habits. The muscle of S. lewini should be consumed by people cautiously so as not to exceed the recommended intake per week.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Magdalena E. Bergés-Tiznado
    • 1
  • Fernando Márquez-Farías
    • 2
  • Raúl E. Lara-Mendoza
    • 2
  • Yassir E. Torres-Rojas
    • 3
    • 4
  • Felipe Galván-Magaña
    • 5
  • Humberto Bojórquez-Leyva
    • 3
  • Federico Páez-Osuna
    • 1
    • 3
    • 6
  1. 1.Posgrado en Ciencias del Mar y LimnologíaUniversidad Nacional Autónoma de MéxicoMexicoMexico
  2. 2.Facultad de Ciencias del MarUniversidad Autónoma de SinaloaMazatlánMexico
  3. 3.Unidad Académica Mazatlán, Instituto de Ciencias del Mar y LimnologíaUniversidad Nacional Autónoma de MéxicoMazatlánMexico
  4. 4.Instituto de Ecología, Pesquerías y Oceanografía del Golfo de MéxicoUniversidad Autónoma de Campeche (EPOMEX-UAC)CampecheMexico
  5. 5.Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias MarinasLa PazMexico
  6. 6.Miembro de El Colegio de SinaloaSinaloaMexico

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