摘要：The fish community of a channelized stretch of a lowland floodplain River Morava (Danube basin) was surveyed before and after an exceptionally extensive flood in July 1997. Water discharge peaked at 2,000% of long-term average and discharge > 1,000 % lasted for 20 days. Electrofishing survey along the bank in three inter-weir reaches revealed 26 species, with the same species (chub Leuciscus cephalus, gudgeon Gobio gobio) dominating before and after the flood. The flood had a minor effect on the assemblage structure. The total density of fish was not significantly different before and immediately after the flood. The largest decline was observed for pelagic species (e.g. bleak Alburnus alburnus, roach Rutilus rutilus) and benthic species (e.g. barbel Barbus barbus). The overall gudgeon abundance did not decrease significantly after the flood, though length-frequency distribution revealed a decrease in abundance of one-year-old individuals. The flood had no effect on abundance of chub and burbot (Lota lota) but increased the abundance of perch (Perca fluviatilis).
