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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Verification of the Relationship between Stock Density and Transparency of Water
 CHMELICKÝ, Petr
The given study reveals results which were obtained after having conducted a survey on the physical and chemical properties of water including its transparency, along with zooplankton sampling and the measurement of dynamics related to fish stock growth. This research was conducted in three different ponds with surface areas of 68.2 ha, 48 ha and 5.5 ha, situated in the Protected Landscape Area of Český ráj (Bohemian Paradise). These ponds were stocked with carp in the age group from K2 to Kv, at an initial weight of fish stock 196 kgxha-1, 102 kgxha-1 and 127 kgxha-1. The ponds in question were selected so that they either differ in size, or in the intensity of their fish farming. Plankton samples were collected by using the Schlott Fichtenbauer Bauer probe based on the principle of a Schindler-Patalas plankton trap.
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Evaluation of quality and the renewal of surface water in the area affected by surface coal mining.
 VLÁŠEK, Ondřej
The aim of the study was to evaluate the parameters of quality and renewal of surface water in the area affected by surface brown-coal mining. Selected streams were monitored on the Great pokrusnohorska dump, and streams unaffected by dumps. Values of pH, conductivity, alkalinity, oxygen saturation and temperature were measured, and quantitative and qualitative samples of macrozoobethos were taken too. The dump?s water are characterized by high concentrations of dissolved solids and alkalinity. Species diverzity of these waters is lower and is affected not only by chemical compositon of the water, but also by the character of the bottom substrate.
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