National Repository of Grey Literature 16 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Hydroacoustic assessment of the fish stock in Lake Balaton in 2017
Tušer, Michal ; Muška, Milan
This report describes a study of open-water fish assemblage in Lake Balaton, Hungary, in 2017. The lake was acoustically surveyed using two horizontally-oriented 120 kHz transducers. The observed fish stock was assessed on the basis of fish sizes, abundance, biomass, and spatial distribution in the lake.
Report from the monitoring of Danubian spined loach (Cobitis elongatoides) populations in special areas of conservation of Nová Říše and Podtrosecká údolí
Blabolil, Petr ; Bartoň, Daniel ; Kočvara, Luboš ; Tušer, Michal ; Vejřík, Lukáš
The aim of the study was to carry out a monitoring of the Danubian spined loach populations in several localities of selected and nearby areas. In all localities, fish sampling was carried out by the generator powered electrofisher and traps, the basic parameters of fish populations and environmental characteristics were described.
A new tool for improvement the quality of water ecosystems
Blabolil, Petr ; Říha, Milan ; Peterka, Jiří ; Prchalová, Marie ; Vašek, Mojmír ; Frouzová, Jaroslava ; Jůza, Tomáš ; Muška, Milan ; Tušer, Michal ; Draštík, Vladislav ; Ricard, Daniel ; Sajdlová, Zuzana ; Šmejkal, Marek ; Vejřík, Lukáš ; Matěna, Josef ; Borovec, Jakub ; Kubečka, Jan
The Czech multimetric fish based index (CZ-FBI) was developed recently. The aim of CZ-FBI is to assess the ecological potential of heavily modified and artificial water bodies and to detect ecosystems, particularly their specific components, in unsatisfactory conditions. This article describes steps of CZ-FBI development. Since the philosophy used, particular events presenting the results, to recent stage. CZ-FBI is a part of certified methodology of the Ministry of the Environment of the Czech Republic and the comparison with other assessment methodologies within a geographical intercalibration group is in process.
Monitoring of fish populations in Vltava River, quantification of fish migration from reservoir into Vltava River.
Muška, Milan ; Tušer, Michal
The aim of the study was to quantify fish migration activities between Lipno Reservoir body and Vltava River with special emphasis put on description of the dynamics of migratory processes, estimation of abundance of migrating fish and evaluation of the influence of migrants from reservoir on autochthonous river fish community.
Hydroacoustic assessment of the fish stock in Lake Balaton in 2014
Tušer, Michal ; Muška, Milan
The objective of this project was to survey fish assemblage in Lake Balaton using 120 kHz acoustics to estimate fish quantity in open water at night. In addition, the results from this work could further help answer what a proportion of Asian carps might occupy the waters of Lake Balaton based on the resultant size distribution of observed targets.
What do the fish say about the quality of aquatic ecosystems
Blabolil, Petr ; Říha, Milan ; Peterka, Jiří ; Prchalová, Marie ; Vašek, Mojmír ; Jůza, Tomáš ; Čech, Martin ; Draštík, Vladislav ; Kratochvíl, Michal ; Muška, Milan ; Tušer, Michal ; Frouzová, Jaroslava ; Ricard, Daniel ; Mrkvička, Tomáš ; Sajdlová, Zuzana ; Vejřík, Lukáš ; Šmejkal, Marek ; Borovec, Jakub ; Matěna, Josef ; Boukal S., David ; Kubečka, Jan
The first Czech methodology for the assessment of ecological potential of heavily modified water bodies and artificial water bodies based on fish communities was developed. The first step of developing the methodology was preparing the typology of water bodies. The typology distinguishes between water bodies of different altitudes and with and without thermal stratification. Fish were sampled by multimesh gillnets following European standard procedures. The selection of fish metrics was based on statistical analyses in which metrics (fish community indicators) were correlated with the most common stressor – eutrophication. The analysis detected several sensitive metrics (metrics showing the best correlation with the stressor) in which ecological class boundaries were set. Afterwards, combination of sensitive metrics was used for calculation of the ecological quality ratio (EQR) for each of the reservoir sampled. The EQR expresses the deviation between a reservoir’s current ecological status and its maximum potential. The next step consisted of validating the EQR with an independent pressure index and verifying the time stability of ecological potential assessment. The metrics used in the methodology fulfill all the obligations set forth in the Water Framework Directive (2000/60/EC), which include assessment of the composition, abundance and age structure of fish fauna.

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5 TUŠER, Michal
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