Fish community of a heavily modified urban stretch of the River Svratka: fish rescue transfer prior to the initiation of flood protection constructions

0574837 - ÚBO 2024 RIV CZ eng J - Článek v odborném periodiku
Jurajdová, Zdenka - Grmela, J. - Šlapanský, Luděk - Hnilička, Michal - Janáč, Michal - Adámek, Zdeněk - Tkachenko, Maria - Jurajda, Pavel
Fish community of a heavily modified urban stretch of the River Svratka: fish rescue transfer prior to the initiation of flood protection constructions.
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis. Roč. 71, č. 3 (2023), s. 163-169. ISSN 1211-8516. E-ISSN 2464-8310
Institucionální podpora: RVO:68081766
Klíčová slova: Danube basin * fish recruitment * fish survey and transfer * hydropeaking * urban river
Obor OECD: Fishery
Způsob publikování: Open access
https://acta.mendelu.cz/pdfs/acu/2023/03/04.pdf

Here, we present the results of a large-scale fish rescue prior to the building of flood protection structures along a stretch of the River Svratka running through Brno city centre (Moravia, Czech Republic). During this demanding and unique event, 5,861 fish, with a total weight of 1,951 kg, were caught and successfully transferred downstream. A total of 21 species of fish were recorded, of which two were protected species and two non-native to the Czech Republic. The dominant species caught (i.e. > 10%) were chub (Squalius cephalus), nase (Chondrostoma nasus), roach (Rutilus rutilus) and vimba bream (Vimba vimba), making up 85% of the catch. While this stretch of the Svratka supported a type-specific fish community dominated by rheophilic species, the occurrence of many species was supported through stocking by the Moravian Anglers Association. The length-frequency distribution of individual fish species suggests there has been a lack of recruitment over a relatively long period. This is most likely linked with hydropeaking from the Brno reservoir water power plant, with daily sharp fluctuations in flow in a river channel lacking shallow bankside areas and refuges with slow-flowing water preventing fish fry survival.
Trvalý link: https://hdl.handle.net/11104/0344771