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The use of otoliths for growth and population dynamics studies of Percidae and Cyprinidae in Most water reservoir
Tůmová, Eliška ; Frouzová, Jaroslava (advisor) ; Pivnička, Karel (referee)
This Master thesis compares growth of Percidae and Cyprinidae in flooded mining pit Most with water reservoir Vír, which is stable, fifty years old. Fish were cought using toils by workers from Hydrobiology institute, Academy of Sciences, Czech Republic, which are exploring fish stock. Otoliths, scales, and operculas from both families, Cyrinidae and Percidae, were removed from fish for age determination and growth back-calculation in individual years. Due to surplus of nutrients and food in flooding mining pit is assumed a huge growth difference in the first two years of life. The aim of this thesis is not only to describe the difference in the expected growth of individual species, but also to estimate its causes. At the same time will be in a very contrasting conditions compared different methods of age determination. Key words: otolith, fish age, fish population, fish growth, water reservoir, flooded mining pit, growth back-calculations
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Analýza růstu okouna říčního \kur{Perca fluviatilis} v nádržích České republiky
KŘÍŽOVÁ, Marie
This thesis summarises published knowledge on factors affecting the growth of European perch Perca fluviatilis and evaluates its growth characteristics in five chosen reservoirs using otolith analysis. The growth differs between reservoirs and this differences are explained by reservoir characteristics applying correlation analysis followed by linear regression. Otolith analyses shows that females reach bigger sizes than males. Several reservoir characteristics are proven to effect European perch growth of age classes of 0+ to 5+ and its annual size increment.
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The use of otoliths for growth and population dynamics studies of Percidae and Cyprinidae in Most water reservoir
Tůmová, Eliška ; Frouzová, Jaroslava (advisor) ; Pivnička, Karel (referee)
This Master thesis compares growth of Percidae and Cyprinidae in flooded mining pit Most with water reservoir Vír, which is stable, fifty years old. Fish were cought using toils by workers from Hydrobiology institute, Academy of Sciences, Czech Republic, which are exploring fish stock. Otoliths, scales, and operculas from both families, Cyrinidae and Percidae, were removed from fish for age determination and growth back-calculation in individual years. Due to surplus of nutrients and food in flooding mining pit is assumed a huge growth difference in the first two years of life. The aim of this thesis is not only to describe the difference in the expected growth of individual species, but also to estimate its causes. At the same time will be in a very contrasting conditions compared different methods of age determination. Key words: otolith, fish age, fish population, fish growth, water reservoir, flooded mining pit, growth back-calculations
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The usage of fish otholits for environmental studies
Tůmová, Eliška ; Frouzová, Jaroslava (advisor) ; Slavík, Ondřej (referee)
Otoliths are small, white minerals mostly composed of calcium carbonate. They are located in inner ear of fishes and provide balance and hearing. To the biologist, the otoliths are one of the most important structure for understanding the annual age, where and in which conditions the fish was living, and even what was its diet. This paper is focused on summarizing and ordering the use of otoliths, what methods do we use and possibilities of applications in environmental studies. Key words: otolith, fish age, fish population, chemistry otoliths, microstructure of otoliths, chemistry otoliths, fish growth
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