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Open AccessArticle

Zooplankton Size as a Factor Determining the Food Selectivity of Roach (Rutilus Rutilus) in Water Basin Outlets

1
Department of Hydrobiology and General Zoology, University of Szczecin, ul. Felczaka 3c, 71-412 Szczecin, Poland
2
Centre of Molecular Biology and Biotechnology, University of Szczecin, ul. Wąska 13, 70-415 Szczecin, Poland
*
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1281; https://doi.org/10.3390/w11061281
Received: 21 May 2019 / Revised: 18 June 2019 / Accepted: 19 June 2019 / Published: 19 June 2019
Fish occurring in the outlets of water basins reduce the abundance of zooplankton. The study was performed at the outlet sections of the lake and waste stabilization pond of a sewage treatment plant. The aim of the study was to determine which zooplankton is chosen more often by the roach (Rutilus rutilus), those drifting from the waste stabilization pond or from the lake. The zooplankton from the pond was dominated by Daphnia pulex while zooplankton from the lake was dominated by small planktonic rotifers. We observed that the larger the plankter-victim’s size, the faster the reduction of its number. The fish were more likely to feed on zooplankton drifting from the waste stabilization pond than from the lake. It was influenced by D. pulex individuals, attractive for fish due to their largest body size among the analyzed zooplankton. The significance of riverine zooplankton in the downstream food web may render this data even more important. View Full-Text
Keywords: Daphnia pulex; stream ecology; river dispersion; live organic matter; fish feeding Daphnia pulex; stream ecology; river dispersion; live organic matter; fish feeding
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Czerniawski, R.; Krepski, T. Zooplankton Size as a Factor Determining the Food Selectivity of Roach (Rutilus Rutilus) in Water Basin Outlets. Water 2019, 11, 1281.

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