National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Monogenean parasites of fishes of economic importance
Gelnar, M. ; Blažek, R. ; Matějusová, I. ; Ondračková, Markéta ; Šimková, A.
To date , altogether 165 species of monogenean parasites have been recorded on the territory of Czech and Slovak Republics. In comparison with the status of monogenean organismal diversity described in monograph published by Ergens and Lom (1970): "Causative Agents of Fish Diseases", there is a significant increase in regional parasite species richness. During last 30 years, 47 species of monogeneans have been newly recorded in the mentioned territory. Following three reasons trying to explain the situation: 20 monogenean species have been recognized like species nova for science after 1970; another 14 parasite species have represented a new zoogeographical records in central Europe and finally altogether 11 monogenean species have been introduced to our fauna from exotic regions.
Heavy metals in parasite-host systems: tapeworm vs. fish
Baruš, Vlastimil ; Tenora, F. ; Prokeš, Miroslav ; Peňáz, Milan
Concentrations of heavy metals in two parasite-host systems (tapeworm vs. fish) were analysed. In the system Ligula intestinalis vs. common bream Abramis brama, white bream Blicca bjoerkna and roach Rutilus rutilus were found in the biomass of plerocercoids mean heavy metal concentrations ranging in Pb 3.20-4.51, in Cd 0.21-0.31, in Cr 1.13-3.16 mg/kg in the 100% dry matter. Regarding the values of accumulation ratio, the parasite accumulated 12.5-18.9 time more Pb, 2.3-3.0 times more Cd, and 4.4-14.1 times more Cr, compared to heavy metal concentrations in the muscles of intermediate hosts.

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