National Repository of Grey Literature 107 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Management plan of small water supply reservoirs of Landštejn type
Halačka, Karel ; Adámek, Zdeněk ; Jurajda, Pavel ; Mareš, J. ; Kopp, R. ; Grmela, J.
The aim of the methodology is to provide managers and users of small water reservoirs Landštejn type with methodological tools for optimization of the water quality monitoring based on the current level of knowledge and research. Furthermore, provides a design of a methodology for fish community monitoring and optimization of treatments to reduce unwanted fish species and strengthen the status of suitable fish species with the aim of achieving the topdown effect and maintaining or improving water quality in these water reservoirs. The presented methodology summarizes the findings obtained during the monitoring and evaluation of selected parameters of water quality, planktonic and fish communities in water supply reservoirs Landštejn in recent years. It also contains an evaluation of applied treatments, focused mainly on fish stock. Unwanted fish species were caught and the predatory fish were stocked with the aim of optimizing the fish community composition and positively influencing the quality of the water in the reservoirs. The methodology contains recommendations for monitoring of the water quality in the reservoir, including monitoring of planktonic communities, monitoring of fish and recommended manipulation with fish stock. The methodology provides guidance and information for optimization of monitoring and treatments for small water supply reservoirs of the Landštejn type.
Management plan of small water supply reservoirs of Bojkovice and Ludkovice type
Halačka, Karel ; Adámek, Zdeněk ; Jurajda, Pavel ; Mareš, J. ; Kopp, R. ; Grmela, J.
The aim of the methodology is to provide managers and users of small water reservoirs Bojkovice and Ludkovice type with methodological tools for optimization of the water quality monitoring based on the current level of knowledge and research. Furthermore, provides a design of a methodology for fish community monitoring and optimization of treatments to reduce unwanted fish species and strengthen the status of suitable fish species with the aim of achieving the topdown effect and maintaining or improving water quality in these water reservoirs. The presented methodology summarizes the findings obtained during the monitoring and evaluation of selected parameters of water quality, planktonic and fish communities in water supply reservoirs Bojkovice and Ludkovice in recent years. It also contains an evaluation of applied treatments, focused mainly on fish stock. Unwanted fish species were caught and the predatory fish were stocked with the aim of optimizing the fish community composition and positively influencing the quality of the water in the reservoirs. The methodology contains recommendations for monitoring of the water quality in the reservoir, including monitoring of planktonic communities, monitoring of fish and recommended manipulation with fish stock. The methodology provides guidance and information for optimization of monitoring and treatments for small water supply reservoirs of the Bojkovice and Ludkovice type.
Management plan of small water supply reservoirs of Hamry type
Halačka, Karel ; Adámek, Zdeněk ; Jurajda, Pavel ; Mareš, J. ; Kopp, R. ; Grmela, J.
The aim of the methodology is to provide managers and users of small water reservoirs Hamry type with methodological tools for optimization of the water quality monitoring based on the current level of knowledge and research. Furthermore, provides a design of a methodology for fish community monitoring and optimization of treatments to reduce unwanted fish species and strengthen the status of suitable fish species with the aim of achieving the topdown effect and maintaining or improving water quality in these water reservoirs. The presented methodology summarizes the findings obtained during the monitoring and evaluation of selected parameters of water quality, planktonic and fish communities in water supply reservoirs Hamry in recent years. It also contains an evaluation of applied treatments, focused mainly on fish stock. Unwanted fish species were caught and the predatory fish were stocked with the aim of optimizing the fish community composition and positively influencing the quality of the water in the reservoirs. The methodology contains recommendations for monitoring of the water quality in the reservoir, including monitoring of planktonic communities, monitoring of fish and recommended manipulation with fish stock. The methodology provides guidance and information for optimization of monitoring and treatments for small water supply reservoirs of the Hamry type.
Juvenile fish communities along selected profiles of the Odra basin
Jurajda, Pavel ; Jurajdová, Zdenka ; Mikl, Libor ; Šlapanský, Luděk
The aim of this report is to evaluate juvenile fish communities along specific profiles of the Odra River Basin as a basis for updating the Upper Odra River Basin Plan, according to the valid methodologies of the Ministry of the Environment.
The genetic structure of brown trout populations at selected localities in the Krkonoše Mountains National Park
Jurajda, Pavel ; Bartáková, Veronika ; Jurajdová, Zdenka ; Mikl, Libor ; Bryjová, Anna
The aim of this study is to assess the genetic uniqueness of brown trout populations (Salmo trutta m. Fario) at selected localities in the Krkonoše Mountains National Park.
The standpoint on the importance of the Nové Mlýny Reservoir fish pass
Jurajda, Pavel
The subject of this contract is an assessment of the importance of the Nové Mlýny dam fish pass on the River Dyje as regards its importance for the fish community.
Ichthyological and hydrobiological survey of the Domovina and Mlýnský brook backwaters at Olomouc
Jurajda, Pavel ; Adámek, Zdeněk ; Všetičková, Lucie ; Jurajdová, Zdenka ; Šlapanský, Luděk
The subject of this contract is to assess fish community and zoobenthos status in the Domovina and Mlýnský brook backwaters in connection with the planned reconstruction of the Šantovka weir (Mlýnský brook).
Ichthyological evaluation of fish communities at sites of interest in relation to special-purpose fisheries management. Final report for 2016-2018
Jurajda, Pavel
The aim of this study, which has been under way since 2008, is to use the Hamry reservoir as a model for biomanipulation of the fish community to improve water quality. A secondary aim was to assess whether effective biomanipulation of the fish community is a feasible management measure for reservoirs.
Potrava dravých ryb vodárenských nádrží povodí Moravy
Mikl, Libor ; Adámek, Zdeněk ; Šlapanský, Luděk ; Všetičková, Lucie ; Jurajda, Pavel
Biomanipulace jsou považovány za jeden ze základních pilířů, kterými je možné ovlivnit jakost vod na vodárenských nádržích. Pro posouzení možností a účinnosti biomanipulačních opatření na vodárenských nádržích v povodí Moravy (Bojkovice, Ludkovice, Landštejn, Nová Říše a Hubenov) proběhly během jarních a letních měsíců v letech 2016 a 2017 kontrolní odlovy ryb (Jurajda et al. 2018). Ryby byly odlovovány s použitím elektrického agregátu a tenatních sítí. Na potravní analýzu bylo celkem odloveno 922 jedinců (dále ind.) dravých ryb: štika obecná (39 ind.), bolen dravý (24 ind.), okoun říční (805 ind.), candát obecný (43 ind.) a sumec velký (11 ind.).\nRybí složka v potravě dravých ryb studovaných vodárenských nádrží, tvořila celkem 75 % hmotnostního zastoupení z celkově přijaté potravy a dominovaly v ní především kaprovité ryby s 41 % hmotnostním zastoupením (plotice 15 %, perlín 12 %, cejn 8 %, ouklej 3 % a blíže neidentifikovatelné kaprovité ryby 2 %) a okounovité ryby s 20 % (okoun 15 %, candát 2 %, ježdík 1 % a blíže neidentifikovatelné okounovité ryby 1 %). Natrávené zbytky ryb, které nebylo možno zařadit do žádné vyšší taxonomické skupiny, tvořily 12 %. Druhou nejpočetnější složku potravy tvořili bezobratlí (24 %). Nezanedbatelnou část kořisti predátorů tvořily i samotné dravé druhy ryb 23 % (okoun 15 %, štika 4 %, candát 3 %, blíže neidentifikovatelné okounovité ryby 1 %). Kanibalismus se na složení potravy dravých druhů ryb podílel celkem 11 %, u okouna tvořil 15 %, u štiky a candáta shodně 13 %, zatímco u bolena a sumce nebyl zaznamenán.\nVýsledky potravních analýz spolu s monitoringem rybích společenstev studovaných nádrží, při němž byl zjištěn poměrně vysoký poměr dravých ku nedravým rybám (Jurajda et al. 2018) naznačují, že za současného stavu biomasy dravých ryb a vstupu nutrientů, mohou biomanipulační opatření sloužit maximálně jako prostředek k zakonzervování současného stavu jakosti vod na vodárenských nádržích, nikoliv jako opatření, které by mohlo významněji přispět ke zlepšení kvality surové vody.
Rybí společenstva pěti vodárenských nádrží v povodí Moravy
Jurajda, Pavel ; Janáč, Michal ; Roche, Kevin Francis ; Mikl, Libor ; Šlapanský, Luděk ; Krechler, I. ; Adámek, Zdeněk ; Jurajdová, Zdenka ; Halačka, Karel
Cílem této pilotní studie bylo přinést základní data o rybích společenstvech pěti, doposud jen málo prozkoumaných, vodárenských nádrží.

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