Heavy metals in fish-parasite systems from Danube river (Bulgarian and Serbian parts)

摘要

Concentrations of heavy metals (Cu, Zn, Cd, Pb and Mn) in fish tissues from Rarbus barbus and Silurus glanis and in their parasites - Pomphorhynchus laevis and Eustrongylides excisus were analysed by atomic absorption spectrophotometry. Studies were done in two points in the Danube river in comparison - Archar (Bulgaria) and Prahovo (Serbia) The amount of heavy metals was generally higher in Acanthocephalans than in their hosts -fish from the both points. The metal levels in Eustrongylides excisus were above than in their hosts. Acanthocephalans may serve as very sensitive and useful indicators for available haevy metals, mainly Pb and Cd, in aquatic ecosystems. Nematodes could not serve for this purpose. Based on these data there were no significant differences in heavy metal concentration from the both sites in the Danube River.