engleski

Concentration of lead, mercury, cadmium and arsen in tissues of pond carp (Cyprinus carpio)

The aim of our investigation was to determine heavy metal content in tissues of two years old market carp, grown up in fishpond near Našice, Croatia. Tissue samples (muscle, liver, kidney, gill) from eight fishes angled in summer 1997. were analysed for lead, mercury, cadmium and arsen concentration by atomic absorption spectrophotometry method (AAS). Arsen concentration in all samples was considerably lower from minimal concentration allowed according to the Law of the Republic of Croatia (MCA, 2 mg/kg). Mercury content, too, did not exceed Croatian MCA value (0, 5 mg/kg), although in two muscle samples it tends to reach it. If compared with MCA value in Republic Bohemia for the muscle mercury content in peaceful fishes (0, 1 mg/kg), five samples mounted it considerably, one value being three times as high. Lead tissue concentration was also not higher from Croatian MCA (1, 0 mg/kg), although one muscle and one kidney sample almost reached it. When compared with German MCA (0, 5 mg/kg), three muscle, five gill, four liver and seven kidney samples were higher. According to the MCA in Netherlands (0, 3 mg/kg), three muscle, five gill, four liver and seven kidney samples were higher. The worst founding concerns cadmium concentration, which is under the allowed limit only in muscles, while in kidney only two samples are under the Croatian MCA (0, 1 mg/kg), and only one under the British and Bohemian MCA (0, 05 mg/kg). In liver, cadmium concentration was not increased in five samples according to Croatian MCA, and only in one according to British and Bohemian MCA. One kidney and one gill sample had as much as four times as high cadmium concentration compared with Croatian MCA, and only in one gill sample had as much as four times as high compared with British and Bohemian MCA. Moreover, a significant positive correlation (p<0, 001) was proved for total body mass and muscle lead, as well as liver mass with gill lead and muscle mercury concentration. The possible origins of high heavy metal concentration in pond carp tissues are discussed.

Cyprinus carpio; lead; mercury; cadmium; arsen

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