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Vliv původu a strategie chovu lososovitých ryb na dosahované produkční parametry
Kudláček, Josef
Selection of adequate genetic material and the right breeding strategy are some of the basic factors affecting success of salmonid fish breeding. The study is focused on a comparison of several populations of rainbow trout with different origin and breeding strategies. Data from reports of The Czech Fish Farmers Association and Diplomas Thesis related to given issue were used. Growth rates, survival and yield were the main criteria for evaluation. In the first part, data from several years monitoring of trout breeding at Annín were processed. At Annín was observed the influence of artificial selection on production parameters of rainbow trout line Pd75. Results show that selected populations reached 8.64 % of average selection profit. At the second part, data from five-year monitoring at Velká Losenice were analysed. Two populations of rainbow trout (PdMar93 a PdM) were compared. The obtained results showed better growth and 4 % higher yield in case of PdMar93. At the third part, focus was on comparison among different strategies of fish breeding in the Czech Republic. According to results suitably selected feed and climate conditions showed high influence. In some cases, significant influence of chosen species for breeding was detected. The best parameters achieved hybrids of Salvelinus compared to rainbow trout. Suitable chosen genetic material and breeding strategy can highly affect production parameters of farmed fish, consequently and economy of farming.
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Využití komponentů a krmiv rostlinného původu ve výživě kapra obecného (Cyprinus carpio L.).
Kudláček, Josef
The aim of this thesis was to compare the effects of feed mixtures with different share of selected plant components on common carp (Cyprinus carpio L.). Two feed tests were conducted in recirculation aquaculture system, in tanks with a volume of 160 l. The tests were conducted in two repetitions and lasted for 64 - 65 days. The feed ratio was 2% of the fish stock weight. For the first test 6 feed variants were prepared. A complete feed mixture for carp (KP1 Plus 15%) was chosen for the control and also as the base for other experimental feed mixtures. The following variants were prepared: feed mixtures with the addition of pea 15%, soybean 15%, lupine 15%, 30% and 45%. The resulting effect was similar for all feeds. Soybean 15% feed achieved the best results (FCR 2.47, SGR 0,71 %.d-1, RGR 50,14 %). Lupine feeds showed worse production parameter levels, whencompared tothe control. From an economic point of view, the mostcost effectivefeed was lupine 45% (FCR 2,67, SGR 0,66 %.d-1 RGR 46,64 %). For the second test 4 feed variants were prepared. The control and base for experimental feed mixtures was the same as in the first test (KP1 Plus 15%). The following feed variants were used: lupine 20%, 45% and 70%. Feed variant with 45% lupine achieved the best results (FCR 2,23, SGR 0,79 % .d-1, RGR 56,75 %) ,followed by lupine 70% (FCR 2,24, SGR 0,78 %. d-1, RGR 56,91 %), therefore, lupine feeds have achieved better production and economic parameters, when compared to the control.
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