Biomanipulační opatření na vodárenské nádrži Hamry - slabá odezva fytoplanktonu na redukci biomasy planktonofágních ryb

0439324 - ÚBO 2015 CZ cze C - Conference Paper (international conference)
Jurajda, Pavel - Adámek, Zdeněk - Janáč, Michal - Roche, Kevin - Mikl, Libor - Rederer, L. - Zapletal, T. - Koza, V. - Špaček, J.
Biomanipulační opatření na vodárenské nádrži Hamry - slabá odezva fytoplanktonu na redukci biomasy planktonofágních ryb.
[Biomanipulation measures at the Hamry water supply reservoir - poor reaction of phytoplankton to planctivorous fish reduction.]
65 let výuky rybářství na Mendelově univerzitě v Brně. Brno: Mendelova univerzita, 2014 - (Kopp, R.), s. 140-146. ISBN 978-80-7509-153-6.
[65 let výuky rybářství na Mendelově univerzitě v Brně. Brno (CZ), 02.12.2014-03.12.2014]
Institutional support: RVO:68081766
Keywords : phytoplankton * Hamry water supply reservoir
Subject RIV: GL - Fishing

One measure commonly used for improving water quality in open waters is biomanipulation of fish stock. Previous studies in shallow lakes confirm the importance of reducing cyprinid populations for increasing zooplankton. Empirical results from reservoirs, however, are scarce. The aim of this study was to evaluate the effect of an intensive reduction of cyprinid fishes and perch fry density between 2009 and 2013 on water quality in the Hamry drinking water reservoir. The abundance of common bream broodstock decreased by around 12 000 individuals over the five years, and biomass dropped below 20 kg.ha-1. Stocking with pike and zander proved less effective. In reservoirs similar to Hamry, reduction of bream biomass can be a highly effective means of increasing filtering zooplankton biomass. Phytoplankton dynamics, however, appear to depend on additional factors, with nutrient loading (especially phosphorus) probably playing the primary role.
Permanent Link: http://hdl.handle.net/11104/0242624