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Využití střevličky východní (Pseudorasbora parva) při produkci násadového materiálu candáta obecného (Sander lucioperca)
Kadlec, Lukáš
The subject of the Diploma Thesis was to summarize all the data published either from scientific papers or collected during the experiments, relating to the possibility of using topmouth gudgeon as fish food. The main part is composed of the results and conclusions obtained from the experiments conducted in the model recirculation system, under controlled conditions. The experiments were focused on the feed preferences of the pikeperch (Sander lucioperca), for the given size category of the topmouth gudgeon (Pseudorasbora parva), stimulation of the food intake of the pikeperch in the conditions with different amounts of topmouth gudgeon, and on the intraspecific competition for food in cases with different numbers of the stocked pikeperch. Bigger food preference was confirmed for the topmouth gudgeon, in the size category up to 7 cm (on average 29.8 % of the whole body length), than for the topmouth gudgeon bigger than 8.5 cm (on average 42 % of the whole body length). Results also show higher food intake in-tensity in case of continuous supply of topmouth gudgeon, while the intraspecific stimu-lation of the food intake has not been either proven, or disproved. Data obtained enables us to better understand the nutritional activity of the pikeperch, and can be used in working conditions, with the aim to dose the amount of the topmouth gudgeon as fish food.
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