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(35-05) Investigation of river Tisa fish fauna - one year after the accidental cyanide pollution. Allner, Bernhard1, Belz, André1, Korte, Egbert2, Liska, Igor3, Nikutowski, Nadja1, Schaat, Annette1, Sallai, Zoltán4, Stahlschmidt-Allner, Petra*,1, 1 Hessian Agency for the Environment and Geology, Wiesbaden, Germany2 Senckenberg Institute, Frankfurt, Germany3 International Commission for the Protection of the Danube River (ICPDR), UN, Vienna, Austria4 Environment and Nature Conservation Association (NIMFEA), Szarvas, Hungary ABSTRACT- Over the year 2000 several industrial accidents related to Rumanian mining activities impaired the ecosystem of the Hungarian upstream part of the river Tisa. Cyanide and heavy metal burden reached lethal concentrations for teleosts and caused a death of fish. In 2001 the International Commission for the Protection of the Danube River (ICPDR) initiated a monitoring of river Tisa fish fauna. At 7 sampling sites fish were caught by electrofishing. The species diversity and abundance of the caught were studied. At each sampling sites 40 individuals of two indicator species (Alburnus alburnus, Leuciscus cephalus upstream, Leuciscus idus downstream) were investigated more detailed. Biomarkers to describe the condition of the indicator species were parasitiziation, scale annual ring formation for age determination, body and gonadal growth, vitellogenesis, gonadal histopathology, and sex ratio. The results of this investigations will be discussed in relation to hydrogeological conditions and industrial- and urban impacts on riverine ecology of the sampling sites. Further the results of the study will be compared with data of a river Rhine fish monitoring study. The study was supported by the European community Project ID JDS-ITR SUB 01/323037.and the Hessian Agency for the Environment and Geology HLUG Wiesbaden Germany Project ID OMAS Key words: accidental pollution, compensatory capacity, endocrine disrupter, riverine fish fauna |
