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Three years long investigation of fishpond Dehtář - first fishpond in the NETLAKE COST action project
Potužák, Jan ; Šumberová, Kateřina ; Fránková, Markéta ; Fabšičová, Martina ; Ducháček, M. ; Císař, K. ; Duras, J.
In 2014–2016 we monitored basic environmental parameters in the fishpond Dehtář near České Budějovice (Czech Republic) using system of sensors. Among other parametres we studied for instance water chemistry and phyto- and zooplankton community biomass, and species composition. Thank to the method used we recorded strong fluctuations in some of the environmental parameters, parrticularly in oxygen concentrations. Thank to the integration of the auomatic high frequency monitoring using the sensor system along with traditional research methods we were able to interpret the marked ecosystem changes. Several factors participated in the several days long oxygen depletion: warm and calm weather, later interchanged by cold front accompanied with mixing of water column and cloudy sky, fish farming management (high amount of nutrients related to manuring) and changes in biomass of phytoplancton (fast decomposition of high biomass amount of cyanobacteria). Our results enable to prevent similar situations in future, by e.g. lowering of nutrient input.
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Fishpond sediment – new approach to the nutrient recycling in the agricultural landscape
Potužák, Jan ; Duras, J. ; Kröpfelová, L. ; Šulcová, J. ; Chmelová, I. ; Benedová, Z. ; Svoboda, T. ; Novotný, O.
Possibilities of the use of the fishpond sediment in the improvement of arable land is discussed. Among others, this approach has a high potential to contribute to the recycling of phosphorus in the agriculture landscapes. For this purpose, we propose set of particular techniques which were tested in the field study.
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Fishponds and water quality
Duras, J. ; Potužák, Jan ; Marcel, M.
Most of the fishponds in the Czech Republic is highly eutrophic to hypertrophic. This situation is related to the run-off in the catchments and by the fis-farming management (especially fertilisation). Long-term monitoring of fishpond water quality is complicated by large spatiotemporal variability of the parameters measured.
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