Acta Univ. Agric. Silvic. Mendelianae Brun. 2018, 66(3), 655-663 | DOI: 10.11118/actaun201866030655

Fish Communities of Five Drinking Water Reservoirs in the Morava River Basin

Pavel Jurajda1, Michal Janáč1, Kevin Roche1, Libor Mikl1, Luděk Šlapanský1, Ivo Krechler2, Zdeněk Adámek1, Zdenka Jurajdová1, Karel Halačka1
1 Institute of Vertebrate Biology of the Czech Academy of Sciences v.v.i., Květná 8, 603 65 Brno, Czech Republic
2 Morava River Authority, Dřevařská 11, 602 00 Brno, Czech Republic

While fish communities have been studied in Czech reservoirs for decades, monitoring has increased since implementation of the EU Water Framework Directive (2000/60/EC). Despite this, many smaller drinking water reservoirs have yet to be surveyed. Between May and July 2016, we undertook a pilot-study examining the fish communities of five Moravian reservoirs (Ludkovice, Bojkovice, Hubenov, Nová Říše and Landštejn). Fish were sampled using boat electrofishing along the littoral zone and Nordic gill nets in the pelagic zone. Both methods were evaluated separately and combined as CPUE and relative abundance and biomass ( %). Nineteen fish species and one hybrid were recorded, with roach Rutilus rutilus dominating overall by abundance, but carp Cyprinus carpio, pike Esox lucius and wels Silurus glanis dominating by biomass in electrofishing samples. Predatory species represented up to 60 % of biomass in the combined sample, with an F/C index ranging from 0.5-3, implying a high abundance of predators. Electrofishing tended to underestimate the abundance of bleak and ruffe, while gill nets underestimated the biomass of predatory species. In some reservoirs, the abundance of pike and wels was high (though it is difficult to say if these fish were stocked or the result of natural reproduction). In others (e.g. Landštejn), zander Sander lucioperca were not registered by either sampling method, despite intensive stocking. Overall, gill netting alone appears inadequate for gaining a true picture of the fish community in reservoirs and we suggest a combination of electrofishing and gill netting in future.

Keywords: biomanipulation, predator stocking, reservoir fish assemblage, sampling strategy
Grants and funding:

This study was supported through the NAZV project QJ1620240 (Application of "top-down" biomanipulation to reduce eutrophication caused by agriculture in reservoirs).

Published: June 28, 2018  Show citation

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Jurajda, P., Janáč, M., Roche, K., Mikl, L., Šlapanský, L., Krechler, I., ... Halačka, K. (2018). Fish Communities of Five Drinking Water Reservoirs in the Morava River Basin. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 66(3), 655-663. doi: 10.11118/actaun201866030655
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