Dietary uptake of dioxins (PCDD/PCDFs) and dioxin-like PCBs in Spanish aquacultured turbot (Psetta maxima).
The human population is exposed to dioxins (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) mainly through diet; bioaccumulation and biomagnification in aquatic environment results in fishery products and by-products being an important vector to humans. The determination of PCDD/Fs and dl-PCBs in fillets of young turbots (Psetta maxima) (0-2 years) from aquaculture plant (Galicia, Spain) (N = 21) and in feeding stuffs were carried out, and dietary accumulation values and lipid-normalized biomagnification factors (BMF) relating concentration in fish and in feed were calculated. Levels found in feeding stuffs (0.5 pg TEQ-PCDD/F/g and 1.6 pg TEQ-dl-PCB/g), and turbots (0.13-0.27 pg TEQ-PCDD/F/g fresh weight and 0.35-1.2 pg TEQ-dl-PCB/g fresh weight) were below maximum permitted levels set by EC. Levels of toxic compounds in feeding stuff are reflected in fish fillets; predominant isomers are 2,3,7,8-TCDF, OCDD, 1,2,3,7,8-PeCDF, 2,3,4,7,8-PeCDF and 1,2,3,4,6,7,8-HpCDD, and PCBs 118, 105, 156 and 167. Relevant compounds accounting for total toxicity are the same congeners in feeding stuff and turbots: 2,3,4,7,8- PeCDF; 2,3,7,8-TCDF; 2,3,7,8-TCDD and 1,2,3,7,8-PeCDD, and PCB 126. Higher accumulation efficiency values were obtained for dl-PCBs (30-46%); tetra- and penta-chloro substituted PCDD/Fs showed the highest values (27-34%) of the PCDD/F group. Biomagnification was shown for these compounds (BMF around 1.5).
Blanco
Sonia Lucía
SL
Centro Técnico Nacional de Conservación de Productos de la Pesca ANFACO-CECOPESCA, Vigo, Pontevedra, Spain. lucia@anfaco.es
Sobrado
Cristina
C
Quintela
Corina
C
Cabaleiro
Santiago
S
González
José Carlos
JC
Vieites
Juan M
JM
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D017756:Aquaculture / Q000379:methods; D001572:Benzofurans / Q000008:administration & dosage / Q000493:pharmacokinetics; D000072338:Dibenzofurans, Polychlorinated; D004032:Diet; D005412:Flatfishes / Q000378:metabolism*; D005506:Food Contamination / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000072317:Polychlorinated Dibenzodioxins / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D012449:Safety; D013030:Spain; D014874:Water Pollutants, Chemical / Q000008:administration & dosage / Q000493:pharmacokinetics*
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D014874:Water Pollutants, Chemical; C051452:1,2,3,7,8-pentachlorodibenzo-p-dioxin; D011078:Polychlorinated Biphenyls; C046839:1,2,3,4,6,7,8-heptachlorodibenzodioxin