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Spatial Variation in Contaminant Occurrence in Marine Fishes and Prawns from Coastal Tanzania.
Haarr, Ane; Mwakalapa, Eliezer B; Lyche, Jan L; Mmochi, Aviti J; Polder, Anuschka; Ruus, Anders; Borgå, Katrine.
Affiliation
  • Haarr A; Department of Biosciences, University of Oslo, Oslo, Norway.
  • Mwakalapa EB; Department of Natural Sciences, Mbeya University of Science and Technology, Mbeya, Tanzania.
  • Lyche JL; Department of Paraclinical Sciences, Norwegian University of Life Sciences, Ås, Norway.
  • Mmochi AJ; Institute of Marine Sciences, University of Dar es Salaam, Zanzibar, Tanzania.
  • Polder A; Department of Paraclinical Sciences, Norwegian University of Life Sciences, Ås, Norway.
  • Ruus A; Department of Biosciences, University of Oslo, Oslo, Norway.
  • Borgå K; Norwegian Institute for Water Research, Oslo, Norway.
Environ Toxicol Chem ; 41(2): 321-333, 2022 02.
Article in En | MEDLINE | ID: mdl-34888929
There are limited data on organic contaminants in marine biota from coastal Tanzania, especially on the occurrence of industrial-use contaminants such as polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs). The present study, performed in 2018-2019 in coastal Tanzania and Zanzibar Island, aimed at assessing spatial variation in the occurrence of PCBs; brominated flame retardants (BFRs), including PBDEs; and organochlorine pesticides, including dichlorodiphenyltrichloroethane (DDT), among three locations that differ in degree of anthropogenic activity. Analyzed samples included edible tissues of marine fishes and prawns representing different trophic levels and habitats. The results indicate a mainland-island difference, with fishes and prawns collected on Zanzibar having significantly lower PCB and DDT concentrations but higher concentrations of hexachlorobenzene compared to the two mainland locations. The highest contaminant concentrations were found in fishes and prawns collected around central Dar es Salaam harbor, with median ΣPCBs ranging from 22.3 to 577 ng/g lipid weight and ΣDDTs from 22.7 to 501 ng/g lipid weight, suggesting local sources. Concentrations of PBDEs were similar among locations, suggesting more diffuse sources. None of the "newer-type" BFRs, including compounds introduced as replacements for PBDEs, were detected in the present study. Stable isotope values of carbon (δ13 C) and nitrogen (δ15 N) varied among locations, and the relationship between contaminants and δ15 N varied among locations and habitat (pelagic/demersal). Concentrations measured in the present study are below European guidelines for human consumption of fishes and prawns. However, industrial-use contaminants should be monitored in developing countries because they are contaminants of emerging concern as a result of increasing industrialization and global trade of used products and wastes. Environ Toxicol Chem 2022;41:321-333. © 2021 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Decapoda / Polychlorinated Biphenyls / Flame Retardants / Hydrocarbons, Chlorinated Limits: Animals Country/Region as subject: Africa Language: En Journal: Environ Toxicol Chem Year: 2022 Document type: Article Affiliation country: Norway Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Decapoda / Polychlorinated Biphenyls / Flame Retardants / Hydrocarbons, Chlorinated Limits: Animals Country/Region as subject: Africa Language: En Journal: Environ Toxicol Chem Year: 2022 Document type: Article Affiliation country: Norway Country of publication: United States