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The theme of this thesis is the development of new products from freshwater fish. The literature review offers a general overview of the consumption of freshwater fish, selected methods of fish processing, fish products on the Czech market, biological values of fish, fish preservation methods, HACCP (Hazard Analysis Critical Control Point system), texture and finally the method is described in the conclusion. sensory analysis. The practical part offers an overview of the raw materials and spices used, the production and recipes of selected fish products for use in mechanically separated fish meat. Samples of manufactured products are then analyzed on a NIR Master instrument. The second part also includes a sensory evaluation. The achieved results are then processed and graphically represented.

Amphipods (Crustacea, Amphipoda) can be found in fresh and brackish waters and in oceans and seas, several species live in terrestrial habitats. In comparison with other Central European countries there are fewer species of amphipods in the Czech Republic, their number, however, increased over the last decade from 8 to 12 species. Despite that, there is no recent review on ecology and distribution of those species. Presented study is an overview of epigeous species presently occurring in the Czech Republic, their ecology and habitat preferences, deals with changes in distribution areas and factors governing these changes. Based on specific features of species, it can be concluded that for expansion of distribution range a tolerance to extreme temperature peaks is needed, important is also availability of suitable habitats.

The orientation of fish has important consequences for estimating their true size from horizontal acoustic records. The aim of this study was to verify the assumption of randomly orientated fish in the lacustrine zone of the canyon-shaped Římov reservoir during daytime and to compare distributions of fish orientation between the lacustrine and tributary (riverine) zones.

This bachelor thesis is focused on an interesting group freshwater red algae (Rhodophyta). This group comprises organisms from quite distant evolutionary clades, nevertheless sharing similar ecological requirements. They mostly occur in unpolluted lotic ecosystems. In the theoretical part, I summarized publications dealing with the general and ecological aspects of distribution of these algae (mainly of the genus Batrachospermum). For example, the issue of seasonal populational dynamics, or their role in succession of benthic algal communities. The practical part includes floristic data on findings of various species of freshwater red algae, predominantly from the Czech Republic. Furhermore, it includes observation on seasonality of a single population of Batrachospermum gelatinosum.

This study was aimed at discovering the taxonomical identity of freshwater populations of a prevailably marine green-algal genus Ulva in the Czech Republic. Furtherly, collected samples were compared to available relevant material from European herbaria. The identity of collected specimens was successfully resolved by a combined methodology that involved classical and modern molecular techniques, and discussed in the framework of distribution and ecology of close European taxa.