Structure of 0+ juvenile fish assemblages in the modified upper stretch of the River Elbe, Czech Republic

0424176 - ÚBO 2015 RIV CZ eng J - Journal Article
Valová, Zdenka - Janáč, Michal - Švanyga, Jan - Jurajda, Pavel
Structure of 0+ juvenile fish assemblages in the modified upper stretch of the River Elbe, Czech Republic.
Czech Journal of Animal Science. Roč. 59, č. 1 (2014), s. 35-44. ISSN 1212-1819. E-ISSN 1805-9309
R&D Projects: GA ČR GBP505/12/G112
Institutional support: RVO:68081766
Keywords : YOY fish * fish reproduction * regulation * channelization
Subject RIV: EH - Ecology, Behaviour
Impact factor: 1.183, year: 2014
http://agriculturejournals.cz/publicFiles/110472.pdf

In August 2007, the 0+ juvenile fish assemblage of the upper River Elbe was surveyed using electrofishing. Thirty-six localities were sampled along a 177 km long section between the towns of Verdek and Brandýs nad Labem (river km (RKM) 136–313). Four localities with natural riverbeds, 14 channelized stretches, nine beaches, and nine backwaters were sampled. Altogether, 4521 0+ juvenile fishes were caught, belonging to 26 species. A decrease in species richness and abundance was evident near Hradec Králové, while decreased species abundance was noted along the navigated stretch below Přelouč. The highest catch-perunit- effort (CPUE), species richness, and Shannon index values were observed at beach habitats, the lowest in channelized habitats, and intermediate values in backwaters. Generally, rare beach habitats had significantly more rheophilic species than other habitats, while backwaters had significantly more eurytopic species and higher CPUE for limnophilic species. Backwaters and channel habitats, however, did not differ in any other 0+ fish assemblage parameter studied. The study demonstrated the importance of beaches for fish assemblages along navigable channels. Surprisingly, however, backwaters were not confirmed as important nursery habitats.
Permanent Link: http://hdl.handle.net/11104/0230196