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Monitoring of fulfillment of consumption basket in the selected kindergartens
ZIMMELOVÁ, Veronika
The main aim of the Bachelor thesis in the theoretical part was to outline the issue of boarding in kindergartens, to explain the term ,,consumption basket`` and subsequently to provide analysis of single parts of the consumption basket in regards to its benefits for the organism of a child. In the practical part, the explanation on the principle of calculation of consumption basket is given in the first place. The main aim of the practical part is then to analyse consumption basket in selected kindergartens and carry out, based on the selected criteria of classification, evaluation of fulfillment of consumption basket in the respective kindergartens.
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Fish Farming in Jindřichův Hradec region in the latter half of the 17th century
DVOŘÁK, Filip
Ponds, carp breeding and fish farming from the general point of view were an inseparable part of manor economy in the early modern period in Czech Lands. This thesis is aimed at the complex development of fish farming in the region of Jindřichův Hradec, specifically the manor of Kardašova Řečice, Červená Lhota, Stráž nad Nežárkou and Žirovnice. The author has concentrated mainly at the reconstruction of the local pond system and related issues. The other significant aspects are fish trade, technology of fish farming, everyday operation and distribution of natural salary. The thesis has proved the existence of complicated network of social-professional relations among the people participating in the whole production.
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Gradients of fish distribution in reservoirs
PRCHALOVÁ, Marie
Patterns of fish spatial distribution were studied in two Czech canyon-shaped reservoirs and in three Dutch basin-shaped reservoirs. Effects of environmental variables like habitat depth, slope, distance from the shore and distance from the dam were evaluated using multivariate statistics. Gillnet selectivity was also studied as fish were sampled using gillnets.
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The Content of Mercury and Lead in Sediments from Vltava River and Lipno Reservoir.
MAŘÍKOVÁ, Helena
The aim of this thesis was to define and evaluate the load of sediments by exposure of mercury and lead on the upper flow of the Vltava river and in the Lipno lake. To evaluate possible influence of the glass factory in Lenora for pollution of this area by toxic metals mentioned above. The literature survey refers about problems of mercury and lead content in fresh water and reservoirs sediments, the structure of toxic heavy metals and risks of their release in the enviroment, then in chemical composition of water reservoirs. It also engages in glass manufacturing problems in the glass factory in Lenora, especially the raw materials, which where obviously used for its manufacture. Experimental part describes profile of sampling points, working methods, used chemicals and results of individual analyses. Sediments of the Lipno reservoir and the upper flow of the Vltava river aren{\crq}t seriously loaded with mercury or lead, but in the sediments below Lenora was shown multiple increase of lead and mercury content in comparison with the background. Forest soils has higher mercury content in all localities in comparison with the sediments. On the contrary, the content of EDTA-extractable lead in soils is lower. Detected isotopic ratio of lead 206/207 and 208/206 in sediments of the Vltava river below the glass factory in Lenora have different signature in comparison with the signature of sediments from the Vltava river above the glass factory. On the contrary the signature of lead in all sediments of the Lipno reservoir showed values relevant to natural background of this locality. The structure which corresponds to the lead from the glass factory was also surprisingly detected in humic horizont of the forest soils in Lenora{\crq}s surroundings. The thesis was extended with fish samples from Lipno reservoir and their liver{\crq}s load by lead and mercury content. There were determined isotop ratio (signature) of lead in the fish, the izotop ratio of lead not corresponds to the lead signature from the glass factory in Lenora.
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Changes of biochemical parameters in fish after nitrite exposure
PODLESNÝ, Martin
The aim of this thesis was to assess the effects of long-term nitrite exposure on mortality, growth rate and blood biochemistry in rainbow trout (Oncorhynchus mykiss). Furthermore, acute toxicity tests with nitrite were performed on rainbow trout (Oncorhynchus mykiss) and sheatfish (Silurus glanis). The theoretical part focuses on aquatic toxicology including toxicity evaluation of substances and preparations for water organisms. Detailed information on nitrite are summarized there, namely information on nitrite occurrence and sources in aquatic environment and the mechanism of their uptake and toxic influence on fish including factors influencing their toxicity. The practical part consists of methodology and results of acute toxicity tests on rainbow trout and sheatfish and sub-chronic test on rainbow trout. According to the acute toxicity tests results, 96hLC50 values were estimated at 11.2 mg.l-1 NO2- for rainbow trout and 15.3 mg.l-1 NO2- for sheatfish. Sub-chronic exposure of rainbow trout to nitrite concentrations ranging from 0.01 to 3.0 mg.l-1 lasting 28 days caused an increase of glucose concentration and a decrease of potassium concentration in the blood plasma among all experimental fish compared to control. Elevated nitrite levels were found in the plasma of the fish exposed to concentrations of 0.6 mg.l-1 NO2- and greater. The plasma nitrite levels did not reach those applied in any experimental group in the present study. At highest nitrite concentration (3.0 mg.l-1 NO2-), 42 % growth inhibition and 65 % mortality among fish was noticed. On the basis of growth rate inhibition data, the values of NOEC and LOEC were estimated at 0.01 mg.l-1 and 0.2 mg.l-1 NO2-, respectively.
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Good manufacturing and hygienic practices with processing of freshwater fish.
SMOLA, Jiří
HACCP and good manufacturing practices are tools to the safeguard of food safety. Technologic process of fish processing begins by receiving of live fish and ending with stock and expedition of fish products. Stocking is the operation, whereat is able to get to consumer{\crq}s health hazard. Wrong temperature regulation causes multiplication of microorganisms. Stocking proceed at temperature 0 {--} 2 °C, which is stopping increasing of microorganisms. Practically were tracked difference course temperatures during hours and days. During monitoring was average temperature at 10 AM 2.33 {$\pm$} 1.25°C and average temperature at 10 PM was 2.11 {$\pm$} 1.19°C. During monitoring was average temperature 2.10 {$\pm$} 1.03°C. Maximum temperature was monitored in the morning. The temperature raised trough storage of new products. This short - period increasing is able to influence quality of products.
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The influence of the water quality on managed ichthyocenosis in the Berounka River, 1975-2003
Pivnička, K. ; Humpl, Martin
In 1962-2004 the stepwise increase of the concentration of NO3-, NH4+, Cl-, and SO42- was found up to the end of 1980´s with their subsequent decrease; only for BOD the gradual decrease in all sites and years was observed. These environmental factors (EF) together with the fishery statistics from two fishing wards (B7 and B8) in the Berounka River near Radnice were used in RDA models for the evaluation of the variability in fish assemblage structure in relation to the given EF. The best results in both wards were obtained using model with three EF (BOD, NO3-, SO42-), next models with four (five) factors explained more variability, some EF were, however, not significant. The partial effect of carp as EF on the yield of other species was non significant in B7 and closely above the significance (p=0.036) in B8. The changes in the frequency of fish species in fishery statistics are influenced by EF; the fishery statistics can be used for the evaluation of changes in fish assemblages in the past.
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