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Study of fish-passing facility on the weirs on Bečva river
Chovancová, Kateřina ; Veselý, David (referee) ; Milerski, Rudolf (advisor)
This master's thesis consists of three main parts. The first section describes some types of fish crossings and basic information of their design. There is also marginally described program HEC-RAS. The second part is about the Zuberská weir and Osek stage. I review here fish ladders according to the original drawings in the HEC-RAS and suggest possible options to address these passable fish crossings for the fish crew. The last section is devoted to Mikulenkov weir where the fish crossing has been completely removed. Here I propose a new fish ramp according to modern knowledge and applicable standards. I also review the proposed fish ramp in the HEC-RAS program in order to verify the hydraulic characteristics.
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Business Plan for Foundation of Store
Trčková, Jana ; Hanušová, Helena (referee) ; Bartoš, Vojtěch (advisor)
The bachelor thesis is focused on a compilation of a particular business plan for an emerging shop. The shop is going to sell fresh fish and it is going to conduct business based on a trade licence. The business plan is based on adequate analyses which help to place it on the market and its preservation there.
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Possibilities of using fish meat in the production of pates
Dohnalová, Barbora ; Szotkowski, Martin (referee) ; Mikulíková, Renata (advisor)
The thesis focuses on the possibilities of using fish meat in the production of pates. The aim of the thesis is to create a sensory acceptable pate with the addition of fish meat. During the development of the recipe, various concentrations of fish meat, additives, and different types of fish were evaluated. Three types of fish were selected for the pate production - carp, pike perch and mackerel. The produced pates were subjected to sensory and chemical analysis. In the sensory analysis, it was found that evaluators who do not regularly consume fish meat were more sensitive to its characteristic taste. Mackerel was the best-rated fish both in terms of the middle concentrations of fish meat and overall evaluation of all pates. The fat content analysis confirmed a lower presence of free fat in pates with the higher addition of fish meat. The nitrogen content analysis in pates confirmed that the presence of crude protein in pates increased with increasing amounts of fish meat. The pate containing only pork meat had a similar crude protein content as the pates with the addition of fish meat. The determination of the fatty acid profile confirmed a lower content of saturated fatty acids in pates with fish meat compared to pork pate. Gas chromatography-mass spectrometry in the mackerel pate revealed a substance called pristan, which is also found in other marine organisms. The conclusion of the thesis is devoted to a detailed description of the achieved results and their discussion. The results of the thesis may be useful for the food industry to expand the range of products containing fish meat.
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Development of new products from freshwater fish
HAUSEROVÁ, Tereza
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.
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Psychoaktivní sloučeniny ve vodním prostředí a jejich účinky na ryby
SANCHO SANTOS, Maria Eugenia
Psychoactive substances are emerging compounds that have received an increasing interest in ecotoxicology as a result of their ubiquitous presence in the environment, and the possible effects over non-targeted fauna. They have been detected in continental waters at concentrations ranging from nanograms to micrograms per litre, mainly as a consequence of the ineffective removal in the sewage treatment plants. Within this group of substances, methamphetamine and tramadol were selected in this dissertation due to the lack of research about their potential effects despite of the high amounts reported in water. Methamphetamine, mainly consumed as an illicit drug, is an addictive psychostimulant with special relevance in Central Europe. Environmental relevant and higher concentrations of methamphetamine in water leaded to histopathological alterations in heart and liver in brown trout (Salmo trutta m. fario). The major changes in heart were microvascular injuries, infiltration and fibrosis; and cytoplasmatic vacuolation of hepatocytes in liver. In addition, apoptotic changes were observed in liver. The findings were very similar to those reported in human and experimental animals. The parent compound and the main metabolite, amphetamine, were detected in trout tissues following the order kidney > liver > brain > muscle > plasma. The concentrations of the metabolite were evidently higher comparing to the parent compound; therefore, the histological findings could be suspected to partially derivate from amphetamine. Behaviour - i.e. activity and place preference - and metabolome changes for the period of withdrawal were observed in trouts, linked to remnants of the parent compound and the metabolite in brain. Tramadol is an extensively used analgesic which singular mode of action provides added antidepressant and anxiolytic effects. Realistic concentration of tramadol in water was found to impair essential behavioural traits in the chub (Squalius cephalus) - a native fish species in Central Europe. The degree of the outcomes was correlated with the individual amounts of tramadol in brain. Exposed fish exhibited anxiolytic-like effects, illustrated by lesser bold and social individuals comparing to controls. In the boldness test, exposed fish were less frequently out of the shelter and moved a shorter distance, therefore, they explored the new environment less than control fish. The novel object recognition experiment indicated that, although they distinguished the new item, their activity was reduced, and they explored the new object less. The increased interindividual distance indicated that the shoal cohesion was disturbed. The behavioural traits were associated to the treatment, suggesting the influence of the pollutant over fish personality. Bioconcentration factors for tramadol and methamphetamine were low in all cases, thus, the probability of bioconcentration for these substances is very low. However, these compounds are continuously released into water, leading to their pseudo-persistence and the consequent presence in tissues. The occurrence in fish, and the parallelism in the target signalization result in similar actions in these organisms comparing to human and experimental models. Here we evidenced that the water pollution with the tested neuroactive substances in the aquatic compartment could lead to unexpected effects over fauna, and subsequent changes in the whole aquatic ecosystem.
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Motif of ships and fish on Baroque pulpits in Central Europe
Eliáš, Štěpán ; Oulíková, Petra (advisor) ; Pučalík, Marek (referee)
Ship and Fish motif of baroque pulpits in Central Europe The subject of the bachelor's thesis are the pulpits. Specifically, those that originated in the Baroque period and in the history of art have experienced the terms Schiffskanzel, Fischerkanzel, Schiff-Petri Kanzel and Fischkanzel. What these pulpits have in common, apart from the location in the Central European area,is that they contain the theme of fishing and sailing. The reader will get acquainted with the mutual relations of ship and fish pulpits.
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Religious symbols and their using in current society
SZARVASOVÁ, Michala
The subject of the bachelor thesis is the use of religious symbols in present times. The first part describes the symbol, the religious symbol and ten selected symbols, these being the Star of David, cross, anchor, fish, Hand of Fatima (Hamsa), crescent, yin and yang, tree, elephant, skull. Furthermore, the thesis describes the use of religious symbols in present times, which is followed by research, which was carried out in the form of questionnaire, its processing and evaluation. The research draws conclusions from the current use of religious symbols, respondents' relations to religious symbols, society's awareness and beliefs in religious symbols.
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The effect of direct predation by fish on cercarial populations of selected trematode species (Digenea)
HEINCLOVÁ, Pavla
The predation effects of four fish species on the consumption of free-living cercariae of three trematode species (Plagiorchis elegans, Echinoparyphium aconiatum and Trichobilharzia szidati) were experimentally investigated with regard to specific life-history traits of both predator and parasite. The study provides evidence of a considerable consumption of trematode cercariae by fish and confirms that cercariae play an important ecological role in the energy flow in aquatic food webs.
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Business Plan for Foundation of Store
Trčková, Jana ; Hanušová, Helena (referee) ; Bartoš, Vojtěch (advisor)
The bachelor thesis is focused on a compilation of a particular business plan for an emerging shop. The shop is going to sell fresh fish and it is going to conduct business based on a trade licence. The business plan is based on adequate analyses which help to place it on the market and its preservation there.
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Vliv vykrvení na kvalitu masa kapra obecného (Cyprinus carpio)
KUBÍK, Michal
The aim of this study was to test the influence of bleeding on the flesh quality of common carp. For the assessment of the influence of bleeding on the colour, spectrophotometrical measuring was used. The sensory quality was evaluated to an ISO 8529 standard by a trained staff member of the Institute of Aquaculture and Protection of Water. Both raw and cooked samples were evaluated. Microbiological analysis was done according to ISO 4833 standard and lipid oxidation measured by TBARS. The influence of the bleeding was observed in all colour parameters (L*, a* and b*). The average of L* values was 43.7 +- 1; 42.7 +- 1, a 43 +- 0.9 in bled group and 37.51 +- 0.54; 37.98 +- 0.79; 37.42 +- 0.6 in unbled. The average of a* values was -1.4 +- 0.2; -1.6 +- 0.2; -0.9 +- 0.4 in the bled group and 4.5 +- 2.3; 3.6 +- 1.6; 7.4 +- 1 in the unbled group. A significant difference (p < 0.05) between groups was observed in all days of study in the L* and a* parameter. In the b* parameter there was a difference observed just in the first nine days. A significant difference (p < 0.05) between the bled and the unbled groups was observed in all criteria on the raw sample on the 1st and 3rd days. Cooked samples were significantly different (p < 0.05) just on the 6th day of study. Microbiological results came up to 4 +- 0.2 log CFU.g-1 in the bled group and 6.3 +- 0.1 log CFU.g-1 in the unbled group. The influence of bleeding was shown in lipid oxidation too. At the end of the study TBARS values were 17.8 +- 8.8 ug.kg-1 of the sample in the bled group and 39.9 +- 6.4 ug.kg-1 of the sample in the unbled group. In both groups, exponential growth was shown. The influence of bleeding was observed in all parameters. It can be stated that the bleeding has a positive influence on the flesh quality of common carp. In order to convert these results into practice, further studies to optimize the bleeding process are needed.
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