National Repository of Grey Literature 10 records found  Search took 0.00 seconds. 
Sustainability principles of fish stock of cultural monuments and historical settlements water elements
Adámek, Zdeněk ; Rozkošný, Miloš ; Hudcová, Hana ; Kratina, Josef ; Sedláček, Pavel
The object of the monuments procedure is to put into practice suitable and verified principles of composition of fish stocks of cultural monuments water elements, for production ponds and reservoirs, and for ornamental reservoirs, basins and pools. At the same time, it brings information about methods of fish stock management, principles of introduction of predatory fish, use of fish for biomelioration of aquatic environment. It also provides recommendations for the maintenance and care of farmed fish. To achieve this, it also includes a section aimed at identifying and describing an appropriate approach to solutions to improve water status, including water quality, and ensure the sustainability of fish stocks. Part of the monuments procedure is also a brief analysis of the issue of degradation of the reservoirs and ponds environment from the perspective of fish survival, due to pollution and water eutrophication. It also describes the individual causes of the unsuitable state of the aquatic environment.
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Should there be fishes in the water? - Ecological Educational program on the importance of water bodies without fish
Water reservoir can be found anywhere in the nature. Small ponds without fish are difficult to be found. Biology students, members of biologically interested societies or wider public who is interested in environment can benefit out of these waters to learn more about relations between particular species, water and littoral plants and interactions between ranges of organisms. Fishing and fish farming do not have negligible impact on nutrition and relaxation of humans, but also they do not have negligible impact on life in waters Nowadays, the overly extended fish population is becoming the main problem that is causing fis predation which decimates pond environment. Fishless ponds are very important to provide environment for other aquatic insects and other organisms. It would be beneficial to devote more attention to the fresh water organisms at the school education through education programs or interest workshops and to have sufficient amount of suitable education resources. In this thesis, I describe relationships between organisms in fresh water reservoir, their relations with surroundings, which factors are influencing them and have impact on their occurrence.
Diverzita obojživelníků (Amphibia) a jejich antropogenní ovlivnění v národním parku Podyjí
Bohuslavová, Markéta
The thesis focuses on amphibian species diversity in the National Park Podyjí. There were chosen four areas with various anthropogenic loads, on which monitoring was being regularly performed. Those areas were specifically ponds; Čížovský, Dehťák, under Lesná and a swimming hole called Na Pyramidě. To achieve a numerical representation along with a representation of species, invasive and non-invasive monitoring methods were used. During the research, eight different species were detected, even though there were eleven of them founded in the past. Among the most abundant species is the Common toad, the Agile frog, the Common frog, the Northern crested newt and the Smooth newt. Surprisingly, the presence and successful reproduction of northern crested newts was proved in the pond under Lesná, on the other hand, there were no signs of moor frogs or any other common water frogs. The collected data were afterwards used to calculate synecological characteristics (dominance, species diversity, equitability and the Jaccard similarity coefficient), while the achieved results were compared with the other authors and evaluated in terms of anthropogenic influence. The amphibians in the national park are threatened by a high fish stock and the absence of littoral vegetation. Recommended management within the areas would be to catch and then deploy the appropriate species of fish, as the case may be, build barriers and create the littoral zone.
The influence of the surrounding landscape , fishery management , external and internal factors on water quality in ponds
Janáček, Štěpán ; Vach, Marek (advisor)
The thesis deals with the influences that affect water quality in the ponds . It focuses on selected factors which define water quality . These include e.g. the amount of dissolved oxygen in the water , ammonia, etc. To determine the change in water quality in a fish breeding tank, measured quality of water at the inlet of the tank and at its drain. I enter into the analysis and facts about the amount of fish stocking in ponds , basin shape , location of the pond in the countryside , farming in the watershed .
Plankton of small village ponds
The object of my thesis was to document the basic characteristics of four small ponds. Register seasonal changes in the occurrence of selected zooplankton groups and compare individual ponds among them. Then evaluate management on ponds and assess the possible impact on the formation of plankton. These results were then compared with the current situation on standard economic ponds. In this study, I observed three private ponds and local pond, which were located in the cadastral area Lodhéřov. From the results it is evident, that the zooplankton development was in private ponds very slow, while at local pond was developed zooplankton quickly. The diversity of zooplankton species was higher in local pond. On private ponds showed a high increase in fish, which amounted to R1 597 kg/ha and R3 519 kg/ha. In terms of management of ponds R2 was the least effective because the gain was only 113 kg/ha. Private ponds, according to the average annual ration 2910 kg/ha still ranked in halfintesification, while local pond to intensification ration with 4557 kg/ha.
Adjust the flow - design migration path
Špaček, Jakub ; Marková,, Jana (referee) ; Šlezingr, Miloslav (advisor)
This thesis describes the design of fish ladder on the river Mohelka near the village Chocnějovice. The first section describes the general characteristics of the river-basin and the selected section. It is written introduction to the design, construction and service of the fish ladder. For the task were developed two alternatives. These alternatives were described and compared each other. Included are the input and output data of the given structure modeling using HEC-RAS. The last part is then researched drawings to objects.
The influence of habitat structure on aquatic beetles in southern Bohemia
KOLÁŘ, Vojtěch
I studied the influence of fishpond management and environmental characteristics on diving beetles (Coleoptera: Dytiscidae), which are important predators in aquatic systems. In 2014 I used live traps to study diving beetle communities in 117 ponds in South Bohemia. The ponds were divided in three categories: intensively managed, extensively managed, and without fish. In total 26 species of diving beetles were found (N=1346). Overall, the beetles prefered shallow litoral zones with cattail (Typha), manna grass (Glyceria) and reed (Phragmites). The number of species declined with increasing alttitude and depth near the trap, while their abundance increased with pond area and amount of detritus near the trap. Beetles occured more in ponds with lower pH, lower conductivity and higher oxygen content. More beetles were found in fishless ponds. On the other hand, some ponds with high density of fishes but well preserved littoral zone had similar communities of diving beetles to the fishless ponds. This shows that high density of fish in ponds decreases the diversity and abundance of diving beetles, most likely because it decreases the vegetation in littoral zone. During the survey, four new localities of Graphoderus bilineatus were found; the species is protected by NATURA 2000 and has been known from very few recent localities in the Třeboň area.
The influence of biotic and abiotic factors on the communities of predatory diving beetles
KOLÁŘ, Vojtěch
Diving beetles (Dytiscidae) are important inhabitants of water bodies, where their adults and larvae often represent top predators in the absence of fish. I carried out a literature review of biotic and abiotic factors that may affect the occurrence of aquatic insects with emphasis on the impact of aquaculture practises. In 2011 and 2012 I also carried out a field survey at two pond systems near Jindřichův Hradec. I used five baited traps in both the littoral zone and at the edge of the littoral zone and open water. Ponds with fish usually had very low diving beetle abundances, although one pond with fish but well-developed littoral zone had a relatively high number of species, similar to ponds without fish. My survey therefore confirmed high importance of littoral vegetation for diving beetles. This implies that intensive aquaculture practises are detrimental for the diversity of aquatic insects at a given locality. I have also found one individual of the rare diving beetle Colymbetes striatus, previously known from only a few localities in the Czech Republic.
Comparison of species composition and dynamics of zooplankton communities in ponds with extensive management.
Dynamics and species composition of zooplankton communities were studied in the three experimental ponds (43, 46, and 48) located in VÚRH JU in Vodňany. In all three ponds was carried out extensive rearing of common carp. Zooplankton samples were collected during three growing seasons (2008, 2009, 2010), usually once in each month. Together with zooplankton sampling, water chemical analyzes were also done. Zooplankton diversity and abundance was mainly influenced by the fish stock.
Analysis of an environmental conflict - opinions of main groups of the inhabitants in the pond water area on the subject of the presence of cormorants (fishermen and holidaymakers) and media analysis
ŠÍPOVÁ, Martina
The thesis was chosen on the basis of the continuation of the bachelor´s work. This thesis is focused on the literature search of problems of the conflicts between the protection of cormorants and the interest of fishery, further on the media analysis in the Czech Republic and finally on the processing of opinions of various groups of respondents (holidaymakers in the area called ´Třeboňsko´ and Czech fishermen). The opinions of questioned people were obtained from controlled interviews written down and processed in the questionnaires. The available information shows that a number of the protected cormorants is increasing not only in the Czech Republic but all over the world. The increase of the number of cormorant population causes problems especially to fishery, because cormorants cause the damage by catching fish stock. These conflicts in the problem area are mostly promoted in the media. In the problem area there are important opinions of the key groups of inhabitants. Groups of questioned people demonstrated their knowledge: holidaymakers in the area called ´Třeboňsko´ have basic knowledge in cormorants and problems caused by cormorants. On the contrary, fishermen are well-informed about the problem. The fishermen are more interested in the problem. Media are very important for solving conflicts and forming opinions of various groups of people. Media analysis showed that most spokesmen, who initiated writing newspaper articles were just fishermen. Therefore the articles on the cormorants are negative and without opinions on the spokesmen as member of general public or academics. Results of the sociological analysis have feed back on the results of the media analysis. It was found out that in the Czech Republic there had not been drawn up any management of fish protection againts cormorants. That is why I prefer to suggest the management in the near future. I recommend to follow the existing foreign management, forexample, in Great Britain. Further, I propose to change the Czech legislation for lower payment of the compensation for the damage caused by cormorants.