engleski

Biomonitoring of trace metals (Cd, Cr, Cu, Mn, Pb, Zn, Hg and MeHg) in the Mali Ston Bay (eastern Adriatic) using Mediterranean blue mussel

In the Mali Ston Bay, located on the eastern Adriatic coast, shellfish have been traditionally cultivated for a long time. However, previous studies indicated that biota, marine sediments and seawater in the Bay contain increased levels of some trace metals, when compared with other areas along the eastern Adriatic. In order to assess the bioavailability of trace metals (Cd, Cr, Cu, Mn, Pb, Zn, Hg and MeHg) in the bay, and the health risk of the consumption of shellfish from the Bay, a biomonitoring program was carried out in the period from September 2000 to November 2001. Cultured one-year old mussels (Mytillus galloprovinciallis) were transplanted from a shellfish-breeding farm to two monitoring stations. Mussels were sampled every two months in order to verify possible seasonal variations. Generally, trace metal concentrations in the whole soft tissue were highest in winter and early spring, which was followed by a summer pre-spawning minimum. A digestive gland was the preferential organ for the accumulation of Cd, Cr, Cu, Mn, Pb and total Hg, while MeHg and Zn were more accumulated in the remaining soft tissue. Concentrations of Cr, Cu, MeHg, Mn, Pb and Zn in all tissues were similar at both stations. Contrary, concentrations of total Hg in gills and the digestive gland, and of Cd in the digestive gland were higher at the station located in the area that is under strong impact of submarine springs. The comparison of the studied trace metals concentrations in the edible tissue of mussels with the Croatian legislation showed that the consumption of shellfish from the Bay is not harmful for humans.

Adriatic Sea; active biomonitoring; heavy metals; mussels

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