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Vliv nasycení kyslíku ve vodě na efektivitu intenzivního chovu candáta obecného (Sander lucioperca) v recirkulačním akvakulturním systému
VOJTA, Petr
This thesis deals with an issue of Zander (Sander lucioperca) production in a recirculating aquaculture system RAS in different oxygen rates (50-80% O-, 80-110% Os and O+ 110-150%). Zander weighted W=22,98?15g was planted into two identical recirculating systems with different water temperature. SGR, FCR and FC of survival and general health condition of kept fish in hematology, biochemistry as well as stress indicators were evaluated. The results proved a negative influence of hypoxia (50-80%) on the food reception, growth and general survival of experimental fish kept in this environment in both the recirculating systems with water temperature 20 and 23°C. In the group O- kept in RAS 20°C, higher coefficient of FCR=1,11 was proved in comparison with group O (normoxia) and group O+ (hyperoxia), where no significant difference (p0,05) was recorded. The health condition showed a significant difference (p0,05) of O group in comparison with group O+ and O in RAS 20°C during the TBARS evaluation (brain, gills, muscle), assessing SOD in liver, and GPx (brain and muscle). By determining the HSI, SSI and VSI indexes, the significant differences (p0,05) of HSI and VSI for O+ and O groups in comparison with O- were proved.
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Využití samokrmítkových systémů pro okounovité ryby
HOMOLA, Ondřej
This diploma thesis researched the use of self-feeding systems in intensive aquaculture of pikeperch and perch, serving to optimize the production of these fish species. In the experiment with the pikeperch, there was studied the effect of the various types of feeding methods including self-feeders on the production indicators and feeding behavior. In the experiment with the perch, there was studied the influence of the stocking density on the production indicators and feeding behavior using self-feeding.
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The effect of different oxygen saturation on feed intake and growth of pikeperch (Sander lucioperca) in intensive culture.
MATOUŠEK, Jan
This diploma thesis is focused on culture of pikeperch under controlled conditions and tested the optimal environmental conditions for their good growth and survival. The aim of this work was to test the effect of different oxygen saturation on survival, growth, feed intake, feed conversion rate and condition of pikeperch Pikeperch (mean body weight 10.3 g; n=810) habituated to artificial feed were placed in culture tank of the same volume of water and environmental conditions. Fish were fed ad-libitum. Three different oxygen saturations were tested in triplicate: normoxia with saturation of 85-95% O2, hypoxia with saturation of 55-65% O2 and hyperoxia with saturation of 145-155% O2. The experiment lasted 82 days and was divided into five periods. Biometric measurements of fish were performed at the end of each period. Cumulative survival, fish growth, amount of received feed, specific growth rate and condition factor were used for evaluation of our results. The results showed the positive effect of hyperoxia on feed intake and growth of fish. Slower growth was observed in hypoxia. The mean weight gain for the whole experiment was followed: normoxia 28.2 g, hyperoxia 37.7 g and hypoxia 22.9 g.
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Possibilities of intensive breeding of pike perch (Sander lucioperca) and european perch (Perca fluviatilis) in common duoculture
MAREK, Miloš
The aim of this thesis is to assess the growth rate (and suitability) of different, (in terms of percentual representation) duoculture stocking of Euroasian perch and pikeperch, when they are breeding in the experimental conditions of intensive aquaculture. It is expected to test at least 3 different duoculture stocking and 2 single (control) stocking (100% representation of pikeperch and Euroasian perch). Culture will take place in special experimental tanks which allow quantification of uneaten feed to counting the daily feed intake. Following the own testing of growth rate (including variability), the evaluation of feed intake, survival, feed conversion, and condition indices will be performed. The main tested hypothesis is to find differences in growth and other parameters between Eurasian perch and pikeperch stocking. The own experimental testing will be preceded by a literature search on the topic.
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