Heavy metal concentrations in water, mud and different organs of fish with varied modality of alimentation

Concentrations of heavy metals (Pb, Cr, Mn, Fe, Cu, and Zn) were measured in water, mud and different organs (liver, kidney, intestine, spleen, skin and muscle) of bighead carp (Hypophthalmichthys molitrix), grass carp (Ctenepharyngodon idella), wels (Siluris glanis) and pike (Esox lucius) from three Croatian fish farms. All measurements were carried out by the source excited Energy Dispersive X-Ray Fluorescence method (EDXRF). Significant difference was found in the mud and water composition among the three fish farms. Compared to the fish farm 1, concentrations of heavy metals in mud and water from the fish farm 2 were between 2 and 6 times higner and from fish farm 3 between 2 ana 5 times higher. The concentrations of heavy metals (expressed as wet weight) were measured in different organs of herbivore and predatory fish species and significant difference was found in selected heavy metals concentration in organs of two group fish species with varied modality of alimentation.