Acta Univ. Agric. Silvic. Mendelianae Brun. 2023, 71(3), 163-169 | DOI: 10.11118/actaun.2023.012

Fish community of A HEAVILY MODIFIED URBAN STREtCH OF THE River Svratka: fish rescue TRANSFER prior to THE INITIATION OF flood protection CONSTRUCTIONS

Zdenka Jurajdová1, Jan Grmela2, Luděk Šlapanský1, Michal Hnilička1, Michal Janáč1, Zdeněk Adámek1, Maria Tkachenko1, Pavel Jurajda1, 2
1 Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 00, Brno, Czech Republic
2 Department of Zoology, Fisheries, Hydrobiology and Apiculture, Mendel University in Brno, Zemědělská 1, 613 00, Brno, Czech Republic

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.

Keywords: fish survey and transfer, Danube basin, urban river, hydropeaking, fish recruitment

Received: June 17, 2022; Revised: June 17, 2022; Accepted: June 22, 2023; Published: July 1, 2023  Show citation

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Jurajdová, Z., Grmela, J., Šlapanský, L., Hnilička, M., Janáč, M., Adámek, Z., Tkachenko, M., & Jurajda, P. (2023). 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, 71(3), 163-169. doi: 10.11118/actaun.2023.012
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