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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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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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Methodical guideline for fish sampling in lenitic waters
Kubečka, Jan ; Prchalová, Marie
The document provides complete methodical guidelines for sampling of fish of lakes and reservoirs for the evaluation of the ecological potential and further monitoring requested by the water framework directive (EC Water Framework Directive, 2000/60/EC). The sampling methods were designed so they comply with European standards. Hydroacoustic surveying by the scientific echosounders, surveying by standard protocol of Nordic multimesh gillnets and electroshocking in the very littoral are the prescribed methods. Standard protocol tables for storing of the data are provided.
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Seasonal variability of fish samples
Konečná, G. ; Janáč, Michal ; Jurajda, Pavel
We investigated seasonal variability of fish samples on small submontane stream. Study took place on Vlára stream in Bohuslavice town. One identical 100 m long section was sampled monthly from April to November 2005. Sampling was carried out using electrofishing. Totally, 8238 individuals belonging to 18 species were caught. Number of species was constant during the year (mean +/- SE, 10.5 +/- 0.38). Nine most common species were caught each month. On the other hand, in most cases the rest of species was found just once. Gudgeon (Gobio gobio), roach (Rutilus rutilus) and chub (Leuciscus cephalus) were dominant species. Rare species probably came from lentic waters in the river basin and did not make stable populations in the river.
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