Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/37255
Title: High mercury levels in Antarctic toothfish Dissostichus mawsoni from the Southwest Pacific sector of the Southern Ocean
Author: Queirós, José P.
Hill, Simeon L.
Pinkerton, Matt
Vacchi, Marino
Coelho, João P.
Pereira, Eduarda
Ramos, Jaime A.
Seco, José
Stevens, Darren W.
Xavier, José C.
Keywords: Fisheries
Contaminants
Antarctic resources
Trace elements
Issue Date: Aug-2020
Publisher: Elsevier
Abstract: Mercury is a bioaccumulating toxic pollutant which can reach humans through the consumption of contaminated food (e.g. marine fish). Although the Southern Ocean is often portrayed as a pristine ecosystem, its fishery products are not immune to mercury contamination. We analysed mercury concentration (organic and inorganic forms - T-Hg) in the muscle of Antarctic toothfish, Dissostichus mawsoni, a long-lived top predator which supports a highly profitable fishery. Our samples were collected in three fishing areas (one seamount and two on the continental slope) in the Southwest Pacific Sector of the Southern Ocean during the 2016/2017 fishing season. Mercury levels and the size range of fish varied between fishing areas, with the highest levels (0.68 ± 0.45 mg kg-1 wwt) occurring on the Amundsen Sea seamount where catches were dominated by larger, older fish. The most parsimonious model of mercury concentration included both age and habitat (seamount vs continental slope) as explanatory variables. Mean mercury levels for each fishing area were higher than those in all previous studies of D. mawsoni, with mean values for the Amundsen Sea seamount exceeding the 0.5 mg kg-1 food safety threshold for the first time. It might therefore be appropriate to add D. mawsoni to the list of taxa, such as swordfish and sharks, which are known to exceed this threshold. This apparent increase in mercury levels suggests a recent contamination event which affected the Southwest Pacific sector, including both the Amundsen and Dumont D'Urville seas.
Peer review: yes
URI: http://hdl.handle.net/10773/37255
DOI: 10.1016/j.envres.2020.109680
ISSN: 0013-9351
Appears in Collections:CESAM - Artigos
DBio - Artigos
DQ - Artigos

Files in This Item:
File Description SizeFormat 
High mercury levels in Antarctic toothfish Dissostichus mawsoni.pdf1.74 MBAdobe PDFView/Open


FacebookTwitterLinkedIn
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.