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2N - Field Studies (MOP/124) Comparison of the gonadal development of bream (Abramis brama [L.]) from the river Elbe and two Berlin waters (Germany). Mervee, Hoffmann1, Karbe, Ludwig1, 1 Institute of Hydrobiology and Fisheries, University of Hamburg, Hamburg, Germany ABSTRACT- It is well known, that histopathological markers in tissues (animals and humans) can be used as endpoints in established ecotoxicological examinations. Wild bream were caught from the river Elbe, the river Havel and the Teltow canal (Germany). The fishes were investigated for histological and histopathological effects in testes and ovaries. Atretic oocytes as well as intersex could be observed in both, the river Elbe and the Berlin waters. Although, there is a high variability in the expression of the phenomena. Differences between several locations from the river Elbe and the Berlin waters could be detected. Nevertheless, the part of the middle Elbe and the river Havel / Teltow canal showed similar data of atretic oocytes. Furthermore, a raised incidence of intersex was observed in bream from the Berlin waters. Comparable studies of the gonado somatic index (GSI) demonstrated other patterns. Serious effects resulting in a loss of fertility are limited to local situations. The study was supported by the European Chemical Industry Council (CEFIC). This study based on the Ph.D. thesis from Mervee Hoffmann, at the University of Hamburg. Key words: Reproduction, Fish, River Elbe, Berlin waters |
