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The distribution and structure of sculpin \kur {(Cottus gobio)} populations in the Malše River basin
BUREŠ, Ondřej
The aim of this presented thesis was to contribute to the knowledge of fish fauna in the Malše River downstream from Dolní Dvořiště to Kaplice and in selected right side tributaries of the Malše River (Černá River, Pohořský, Huťský and Tisový Brooks). Ichthyological research was performed from 2005 to 2008. Structure and composition of ichthyofauna was characterized. Bullhead inhabited most of the localities corresponding to the trout region of investigated streams. The populations of bullhead, its habitats were described and compared to each other and in time.
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Ecology,ethology and variability of european green lizard Lacerta viridis in Natural reservation Tiché údolí
Chmelař, Jan ; Rehák, Ivan (advisor) ; Moravec, Jiří (referee)
The European green lizard, Lacerta viridis, is in the Bohemia region stated as critically endangered species. Populations in this region are located beyond the northern border of continuous range of this species and are closely related to the "riverine phenomenon", and deeply engorged river valleys. The chosen locality in Tiché údolí is a subject to a long-term conservational management aimed to strengthen and maintain abundance of the local population. This management is a direct output of a previous study of this population performed in years 1995-1997. Main goal of the presented study is to compare current population characteristics with the older study. The locality has been visited 119 times in years from 2011 to 2014. The studied population now displays higher abundance and inhabits a larger area. The author also performed a spatial analysis of the places with presence of an observed individual in order to determine and evaluate significance of the chosen abiotic factors for habitat discrimination. The results indicate that positive discrimination is based on the presence of a rock debris and a hiding place. Strongest factors towards negative discrimination were high percentages of grass and high vegetation coverage. This study also contains and discusses ecological, ethological and...
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Comparison of ichtyofauna in morphologically similar parts of trout zone of two rivers with different kind of management
ČEJKA, Jakub
The topic of this bachelor´s paper is comparison of biodiversity of fish community in morphologically similar parts of two South Bohemian rivers the Malše and the Blanice, which vary in the kind of fish management. There were chosen four parts of both rivers in the trout to the grayling zone, which were fished with a power generator in spring and autumn 2015. Fished fish, which are important for the fish management, were measured and weighed individually and then all the fish were given back to the parts. Gained data were processed. The parts, which were compared, are CHRO (freshwater fish protected areas), areas, where only original species are handled (brown trout (Salmo trutta m. fario, Linnaeus, 1758) and european grayling (Thymallus thymallus, Linnaeus, 1758)) and areas, where apart of original species rainbow trout popular with sport fishermen (Oncorhynchus mykiss, Walbaum, 1792) is handled. A similar trend of higher stability and condition of original species population in higher located parts of monitored fish district of both rivers was found out. There is a probable dependence of brown trout´s and grayling´s presence on handling of fries, which are heavily influenced by the presence of unoriginal species and sport fishing in the lower parts of the Malše river. It is possible to assume the existence of natural reproduction and subsequent sustainability of both species populations in the above-lying areas. The population of brown trout in the Blanice river can be judged like sustainable by itself in all the parts and influenced by undesirable fish species only in the lower parts. The presence of grayling in all the parts is probably dependent on fish migration from the lower part of the district and there is grayling only sporadic in the higher located parts.
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Zhodnocení rybářského managementu pstruhového revíru Svitava 4
Mareš, Lukáš
Presented master thesis deals with the issue of assessment of management in salmonid fishing ground Svitava 4. The main aim was to compare the state of fish community with the state after the last survey from 2003-2004 and to evaluate the economic evidence (level of fishermen's pressure, level of reached catch and the stocking of economically important species) for ten years in a row. The ichthyological survey was carried out in summer season in 2014 at four localities within the fishing ground Svitava 4. The topographic data of particular localities were measured by the modern devices. Also basic physicochemical parameters of water were measured. The catching was realized by electric-fishing gear. After measuring of morphometric characteristics all the fish were returned back to the fishing ground. The survey established the presence of 8 fish species in 5 families. The abundance of fish community varied on particular localities in the range from 338 to 1633 pcs.ha-1, the biomass from 53,6 to 199,2 kg.ha-1. The fish community of concerned stream has gone through significant changes since the last survey. Considerable decrease in abundance was recorded mainly in the grayling population.
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