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Floristic and mollusco-vertebratological survey on four localities of the blind branches of Blanice river close to Milenovice, Myšenec, Protivín and Vitice. Floristic and mollusco-vertebratological survey on seven localities of the blind branches of Blanice river close to Čejetice, Krašlovice, Skály u Protivína, Slaník and Žďár u Protivína
Kučerová, Andrea ; Čtvrtlíková, Martina ; Blabolil, Petr ; Muška, Milan ; Peterka, Jiří
The aim of the study was to investigate occurrence of aquatic and wetland macrophytes, large water molluscs and vertebrates, and assessment of the effect of planned actions on species composition and protective measures of endangered species
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Assessment of asp reproductive population in Švihov Reservoir in 2016
Šmejkal, Marek ; Blabolil, Petr ; Baran, Roman ; Kočvara, Luboš ; Bartoň, Daniel ; Kolařík, T. ; Prachař, Zdeněk ; Soukalová, Kateřina ; Děd, Vilém ; Vebrová, Lucie ; Vejřík, Lukáš ; Kubečka, Jan
The aim of the contract was to capture reproducing asp by electrofishing and tag fish individually using individual marking technique (PIT-tags). Estimate of asp reproductive population in the Švihov Reservoir was performed on the basis of mark-recapture methods. Furthermore, the length and weight increments were computed for recaptured asp individuals. Tagged individuals were monitored using passive telemetry systems on the tributary of Švihov Reservoir.
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Report on the status of the burbot populations in the Karhov, Lučina, Nýrsko and Zhejral reservoirs and Obecník Pond in 2016
Blabolil, Petr ; Jůza, Tomáš ; Matěna, Josef ; Muška, Milan ; Peterka, Jiří ; Říha, Milan ; Vejřík, Lukáš
The aim of the study was to monitor the burbot populations in four reservoirs and in a pond with previous stocking. The monitoring was carried out during the spring season 2016 and, in the case of the Nýrsko Reservoir, during winter and summer as well. The combination of harmless methods (traps of two types, visual survay, electrofishing, hydroacoustic), a method simulating fishing pressure (long-lines) and a fix-frame trawl were used to detect burbot. A novel monitoring scheme was developet and validated and burbot populatin characteristics described.
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Assessment of Czech water-bodies ecological potential based on fish community
BLABOLIL, Petr
Ongoing environmental changes and increasing pressure on freshwater habitat require that we understand the ecological quality of freshwater ecosystems across a wide range of habitat types. This Ph.D. thesis addresses the utility of fish as ecological indicators in heterogeneous reservoir ecosystems. In the first section, I develop suitable indices and calculate ecological potential in two case studies, one using common fish guilds and traits at a large continental scale and another using species-specific indicators for a country-specific dataset. In the second section, I compare the assessment of fish communities across a large geographical region and identify anthropogenic stressors with the highest impact on fish communities. In the third section, I discuss the issue of optimal gillnet sampling design for reliable fish indicator values to increase the utility of assessment methodologies and to reduce sampling effort and fish mortality required to obtain reliable data. In the fourth section, I compare estimates of fish recruitment based on different sampling methods and develop a novel statistical approach to analyse factors affecting fish recruitment. This work provides an initial step towards the improvement of ecological quality of freshwater reservoirs.
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Final report on ichthyologic work under the project C. J1620240 in 2016.
Kubečka, Jan ; Matěna, Josef ; Čech, Martin ; Blabolil, Petr
Young-of-the-year pike fry was stocked artificially along the left bank of the reservoir Švihov in May 2016. In July 2016 fingerlings inhabited mostly the shallowest littoral. Densities ranged from 1 to 2 pc 100m coast in the dam part into 7-8 pieces per 100 m of the coast in the middle part. Sampling pike fingerlings in the littoral zone has a high efficiency (estimate 84%). Any other observations (installing traps, scuba diving, sampling electrode farther from shore) show that pike fry did not occur at greater depths than most shallow littoral to about half a meter. The densities of fry at the right and left bank of the reservoir apparently did not differ. Even very small pike are probably able to swim across the large reservoir. Of the 81 individuals of pike fry with food 77.8% had a fish prey, and 17.3% had insect larvae in the gut.
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Ichthyological surveys of the Nýrsko and Karhov reservoirs and investigations of abundance, age composition and spawning dynamics of asp population in the Želivka Reservoir in 2015.
Vašek, Mojmír ; Soukalová, Kateřina ; Kočvara, Luboš ; Blabolil, Petr ; Baran, Roman ; Frouzová, Jaroslava ; Koliada, Ievgen ; Muška, Milan ; Šmejkal, Marek ; Draštík, Vladislav ; Kolařík, T. ; Prachař, Zdeněk ; Sajdlová, Zuzana ; Vebrová, L. ; Vejřík, Lukáš ; Kubečka, Jan
The species composition and the relative abundance and biomass of fish communities in the Nýrsko and Karhov reservoirs were evaluated by means of standardised multimesh gillnets. The spawning stock of asp in the Želivka Reservoir was individually marked using PIT tags and the density and behaviour of tagged fish at the main spawning grounds were examined through the whole spawning season. The total number of reproducing individuals in the asp population was estimated. The sex-specific length and weight growth rates of adult asp in the Želivka Reservoir were also calculated. \n\n
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