engleski

Cadmium levels and evaluation of the dietary intake of mediterranean ussel (Mytilus galloprovincialis) and oysters (Ostrea edulis) from southern and northern farming areas along the Croatian coast of the Adriatic Sea

Due to fact that the Adriatic Sea is a closed water system, toxic metals may arise from industrial and urban waste, anthropogenic sources, rinsing of rocks and atmospheric emissions. Many marine organisms, such as shellfishes used in human nutrition, accumulate high levels of metals from the environment and may be used as biomarkers of toxic metals pollutions in the marine area. From the standpoint of food safety, these are unsuitable for human consumption. The aim of this study was to determine cadmium concentrations in the tissue of mussels (Mytilus galoprovincialis) and oysters (Ostrea edulis), the most commonly bred species in Croatia, cultivated using traditional floating park technologies. Mussels (n=25) and oysters (n=25) were sampled during 2013 at two farming areas: Mali Ston Bay (south) situated between the mainland and the Pelješac Peninsula near the Neretva River delta on the southern Adriatic coast and the Istrian Peninsula (north) situated on the northern Croatian coast and bordering on Slovenian waters. The results showed mean cadmium concentrations in muscles of oysters (mg/kg): south 1.59, north 1.48. Mean cadmium levels in mussels were (mg/kg): south 0.30, north 0.56. Significantly higher levels were found in mussels from northern than southern locations (p<0.01). These concentrations exceeded the maximum permissible concentration set by the European Community (1 mg/kg). For the purpose of risk assessment for cadmium levels measured in shellfishe, the estimated weekly intakes were calculated and compared with the toxicological values of the provisional tolerable weekly intake (PTWI) set at 2.5 μg/kg BW by EFSA. The contributions to the PTWI were for (%): oysters: north 118.4, south 127.2 ; mussels: south 24, north 44.8. Therefore, the consumption of large quantities of oysters may pose a health risk to the normal consumer regarding high Cd concentrations and high tolerable weekly intake limits.

Mussels ; Oysters ; Cadmium ; Croatian coast

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