Accumulation and distribution of polychlorinated dibenzo‐p‐dioxin, dibenzofuran, and polychlorinated biphenyl congeners in atlantic salmon ( Salmo salar)

• Published in: Environmental Toxicology and Chemistry
• Main Authors: Isosaari, Pirjo, Kiviranta, Hannu, Lie, Øyvind, Lundebye, Anne‐Katrine, Ritchie, Gordon, Vartiainen, Terttu
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2004
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1897/03-367; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1897%2F03-367; https://setac.onlinelibrary.wiley.com/doi/pdf/10.1897/03-367

Abstract Adult Atlantic salmon (Salmo salar) were fed on four diets containing polychlorinated dibenzo‐ p ‐dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and polychlorinated biphenyls (PCBs) for 30 weeks. Lipid‐normalized concentrations showed that all congeners were equally partitioned between whole‐fish and fillet samples. Skinned fillet accumulated approximately 30% of the total PCDD/F and PCB content in fish. Accumulation efficiencies in whole fish were 43% for 2,3,7,8‐chlorinated dibenzo‐ p ‐dioxins and dibenzofurans, 83% for dioxin‐like PCBs, and 78% for other PCB congeners. Among PCDD/Fs, tetra‐ and pentachlorinated congeners were preferentially accumulated in salmon, whereas hepta‐ and octachlorinated dibenzo‐ p ‐dioxins were excreted in the feces. Substitution patterns that were associated with a preferential accumulation of PCBs in salmon included non‐ ortho substitution and tetrachlorination. Accumulation efficiencies and lipid‐normalized biomagnification factors (BMFs) were not influenced by the PCDD/F and PCB concentrations of the diets. Biomagnification (BMF > 1) of tetra‐ and pentachlorinated dibenzo‐ p ‐dioxins and dibenzofurans and of all the PCBs was observed. Differences in the behavior of PCDD/F and PCB congeners resulted in a selective enrichment of the most toxic congeners in salmon.