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The possibilities of influence sensoric characteristics of common carp flesh
MAŠÍN, Milan
Organoleptic characteristics of fish meat are one of criteria, that make higher quality prerequisites for successful selling, especially for more exacting customers. An objective of this work is evaluate temperature and storage time aspects on these characteristics. Like an appropriate fish was selected Carp (Cyprinus carpio), weighing around 1,5 {--} 3 kg. In own sauce roast meat samples were sensoric analysed directly after killing and than in different time periods. The storage temperature was 3; 5 and -18 °C. Panel of evaluators judged odour, taste, flavour and consistence of fish meat. A protocol with an unstructured graphic scale was used for expressing the intensity of perception. Accomplishments were graphic and statistic processed.
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Diet of great cormorant (Phalacrocorax carbo) in conflict localities
Ráslová, Pavlína ; Čech, Martin (advisor) ; Vrána, Pavel (referee)
vi Abstract Continental subspecies of the great cormorant (Phalacrocorax carbo sinensis) is the Czech Republic's most important fish-eating predator. It causes damage to production fish, as well as sport fishermen and even after its removal from the Czech list of endangered species in 2013, it did not disappear from the spotlight of both local fishermen and researchers. This thesis evaluates the qualitative and quantitative composition of the cormorant's diet during winter 2011/2012 at two selected locations: the Žehuň pond (Kolín district) and Berounka river in the natural reserve Zábělá near Pilsen. This work studies the main components of cormorant's diet in the selected locations and evaluates potential fluctuations and changes in its composition during winter. The study also conducted the analysis of the proportion of commercially harvested valuable fish in cormorant's diet and studied its diversity of the species spectrum. The resulting data for the two sites were compared with each other and with relevant literature. Regurgitated pellets analysis, as well as analysis of diagnostic bones and fish remains located at the sleeping roosts (night roosts) were used for the diet analysis. It was found that at both sites roach was the most caught fish, but from the point of view of total biomass, it was...
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Haematological response of common carp \kur{Cyprinus carpio} to experimental infection with blood stages of the myxozoan parasite \kur{Sphaerospora molnari}
TOMANOVÁ, Anna
Sphaerospora molnari is a histozoic endoparasite causing severe inflammation during sporeformation in the gills of common carp. As for other myxozoans, little is known about the host response to early proliferation and multiplication of this parasite in the fish host. This thesis is focused on a controlled infection experiment using S. molnari blood stages and on determining cellular and haematological changes of common carp as a response to infection, over a 9-week period post intraperitoneal injection. The results show a noticeable increase in cellular components of innate immunity 14 dpi and a massive increase in lymphocyte numbers, likely B cells, 21-28 dpi. The data are discussed in relation to parasite infection intensity in various tissues and organs, and they strongly point to the acquisition of specific immunity of common carp to S. molnari resulting in a controlled, low level infection from 49 dpi onwards.
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Kvalita prostředí a potravní chování kapra ve vztahu k přikrmování v polointenzivní rybniční akvakultuře
Adámek, Zdeněk ; Jurajda, Pavel ; Zukal, Jan ; Janáč, Michal ; Mikl, Libor ; Šlapanský, Luděk ; Všetičková, Lucie ; Prášek, Václav ; Šútovský, I. ; Chytka, V. ; Mrkvová, Markéta
Kombinací čtyř metod terénního výzkumu (telemetrie, elektrolov, potravní analýzy a měření parametrů vody) se ukázalo, že ryby nejsou v polointenzivním rybničním chovu rozmístěny rovnoměrně. Dominantní jedinci se koncentrují v krmných místech v hustotě, která může snížit obsah kyslíku až k hranici fyziologického minima, což vede k horšímu využití krmiv. Menší ryby se zdržují spíše mimo krmná místa a v okrajích rybníka a živí se převážně přirozenou potravu. Kromě menší hmotnosti mají i nižší obsah tuku. Rozdělení obsádky kapra na větší jedince s vyšším obsahem tuku, významně se orientující na krmná místa, a na menší s nižším obsahem tuku živící se více přirozenou potravou vede k doporučení vhodnosti rozšíření aplikace krmiv na více krmných míst, případně jejich střídání.
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Diet of great cormorant (Phalacrocorax carbo) in conflict localities
Ráslová, Pavlína ; Čech, Martin (advisor) ; Vrána, Pavel (referee)
vi Abstract Continental subspecies of the great cormorant (Phalacrocorax carbo sinensis) is the Czech Republic's most important fish-eating predator. It causes damage to production fish, as well as sport fishermen and even after its removal from the Czech list of endangered species in 2013, it did not disappear from the spotlight of both local fishermen and researchers. This thesis evaluates the qualitative and quantitative composition of the cormorant's diet during winter 2011/2012 at two selected locations: the Žehuň pond (Kolín district) and Berounka river in the natural reserve Zábělá near Pilsen. This work studies the main components of cormorant's diet in the selected locations and evaluates potential fluctuations and changes in its composition during winter. The study also conducted the analysis of the proportion of commercially harvested valuable fish in cormorant's diet and studied its diversity of the species spectrum. The resulting data for the two sites were compared with each other and with relevant literature. Regurgitated pellets analysis, as well as analysis of diagnostic bones and fish remains located at the sleeping roosts (night roosts) were used for the diet analysis. It was found that at both sites roach was the most caught fish, but from the point of view of total biomass, it was...
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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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Lokalizace a kvantifikace rybomorky \kur{Sphaerospora molnari} (Myxozoa) u kapra obecného
LISNEROVÁ, Martina
The thesis deals with localization and quantification of Sphaerospora molnari (Myxozoa) in common carp (Cyprinus carpio). Sphaerospora molnari is microscopic endoparasite which attacks various tissues and organs, preferentially parasitizing intracellularly (histozoic type) in a carp fry. In this work, we studied the course of parasite infection in the various tissues and organs of the host (blood, gills, skin, kidney, liver, and muscle) in laboratory conditions. The course of infection was detected using qPCR.
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The dynamics of anglers' attendance and exploitation of carp in the Hostivař Reservoir directly after stocking and out of this period
Winterová, Michaela ; Jankovský, Martin (advisor) ; Čech, Martin (referee)
The main hypothesis supposes a different angler behavior directly after stocking and out of this period. The aim of this work was to evaluate carp preference according to time (within one day in one district) and place (choice of the locations) variability. As an explanatory parameter the number of environmental factors was tested such as weather, the type of a bait or the sensitivity of fishing technique. This information was surveyed by interviewing the anglers at the Hostivař reservoir. The survey took place in two periods - in autumn 2008 after stocking and comparing period in spring 2009. Data elaboration was taken with CANOCO statistic ver. 4.5 software, when the factors influencing frequency of fish species were searched for. Significantly tested were the factors of bread bait, increasing volume of fishing line and amount of anglers proving the concern of that group for orientation of carp catch. From the following results was obtained the average time spent by the anglers at Hostivar - approximately 5 hours. The average visit rate in autumn was 39.2 angler/day and in spring 34.1 angler/day. The analyses of fishing location show the popularity of places with easy entrance to the bank and the better carp catch in those places. The anglers' efforts were in autumn 2002.7 hours/ha/year and in...
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Modelling HSRP and GLBP Gateway Redundancy Protocols
Holuša, Jan ; Marek, Marcel (referee) ; Veselý, Vladimír (advisor)
This thesis deals with theoretical analysis of First Hop Redundancy Protocols. It describes Hot Standby Router Protocol, Virtual Router Redundancy Protocol and Gateway Load Balancing Protocol. It also shows examples of configuration of each protocol on Cisco devices with supported version of the Cisco IOS. Furthermore, this thesis includes design of two of these protocols, Hot Standby Router Protocol and Gateway Load Balancing Protocol, and their implementation in discrete event simulator OMNeT++ and Automated Network Simulation and Analysis library. Finally, the thesis presents results of testing of the implementations in comparison with actual Cisco devices.
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