The investigation of trace element pollution is important for the environmental assessment and management of lacustrine ecosystems, especially when these represent critical freshwater resources in densely populated areas. In this context, this study determined the levels of 15 trace elements in muscles of shad, Alosa agone (Scopoli 1786), a commercialized zooplanktivourous fish, from three primary, but currently still poorly studied, Italian lakes, namely, Lake Como, Iseo, and Garda. Research findings show that shads present similar trace element accumulation patterns among lakes, except for arsenic, which occurs at lower levels in Lake Como. Results provide evidence also for mercury biomagnification in fish, whereas all the other selected trace elements undergo bio-dilution through the same trophic chain. Maximum allowable limits for foodstuff were exceeded for chromium and selenium in shads, whereas mercury levels exceeded the European Environmental Quality Standard biota. These results highlight the need for regular monitoring activities of trace elements in the biota of these lakes.
Keywords: Lake; Pollution; Shad; Trace element; Zooplankton.
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