Concentrations of Silver, Chrome, Manganese and Nickel in Two Stranded Whale Sharks (Rhincodon typus) from the Gulf of California

Francesca Pancaldi, Federico Páez-Osuna, Martín Federico Soto-Jiménez, Darren A. Whitehead, Rogelio González-Armas, Abraham Vázquez-Haikin, Edgar Eduardo Becerril-García, Felipe Galván-Magaña

Research output: Contribution to journalArticlepeer-review

Abstract

Concentrations of Ag, Cr, Mn and Ni were measured in tissues of two whale sharks (Rhincodon typus) stranded in La Paz Bay (LAP) and Punta Bufeo (PB), Gulf of California, during 2017 and 2018. The concentration range of Ni (0.012–1.12 µg/g ww) and Cr (0.16–5.21) in the epidermis of both specimens was lower compared to the concentrations found in the epidermis of whale sharks from East Africa. The whale shark from LAP exhibited higher levels of Mn (4.45 µg/g ww), Ni (0.284 µg/g ww) and Cr (5.21 µg/g ww) in the muscle compared to another filter feeder shark, the megamouth, from Taiwan and from Brazil. The highest concentrations of Ag were found in the heart (3.70) of the individual from LAP and in the filtering pads (1.93) of the shark from PB. Chromium in all selected tissues and the Mn found in the skeletal muscle, testicles (0.50), liver (Right lobe, 1.28; Left lobe, 1.63) and gills (1.54) of both sharks exceeded the limit established by the FAO/WHO for fish products.

Original languageEnglish
JournalBulletin of Environmental Contamination and Toxicology
DOIs
StateAccepted/In press - 2021

Keywords

  • Bioaccumulation
  • Epidermis
  • Liver
  • Threatened species
  • Trace elements

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