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The potential of compound feed and cereals as a tool for keeping the production of carp at a good level in relation to the water quality.
MELKA, Václav
The aim of this diploma thesis was to test the production effectiveness of cereals and compound feed and at the same time, find out what influence they have on the water quality when applied in the semi-intensity carp farming. The feeding test was taking place in the period of 112 days in 10 experimental storage ponds. The feed which was tested, was cereals, extruded feed from the Aller Aqua company with 24% share of protein, pelleted feed glycid type feed with the 12,5% share of protein (KP) and pellet feed glycid type compound feed with 12,5% share of protein and reduced share of phosphorus (KPminus). A tested carp population of the same density was left without any additional feeding, to be fed only on the natural nutrition. Every one of these separated carp populations were fed three times a week in the morning and on the same spot of the fish tank. The testing was taking place twice.The measuring of the parametres of the water (temperature, oxygen, pH) took place once a fortnight, taking samples of the water once a month. At the end of the experiment, the level of phosphorus and the observed production parametres were evaluated.The highest production effectiveness was reached in the carps that were fed with cereals (FCR - Food Convertion Ration 2,41 - 0,46, SGR - Specific Growth Rate 0,54 - 0,07 %.d-1). The lowest production effectiveness was achieved with the pelleted feed KPminus (FCR - 3,72 - 0,30, SGR - 0,39 - 0,02 %.d-1). The highest retention of phosphorus (88%) in the fish biomass was reached with cereals. The lowest retention of phosphorus (60%) was reached in the carps fed with the pelleted feed KP. Feeding carps with tested feeds did not have any significant influence on the water quality. From both the economic and the environmental point of view, the best feed for carp pond farming is cereals.
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Influence of Light Regime on the Success of Adaptation of Pike (\kur{Esox lucius}) Larvae on Pelleted Feed in RAS
DUŠEK, Tomáš
The objective of this thesis for a bachelor´s degree was to experimentally evaluate possibilities of adaptation of northern pike (Esox lucius) for controlled breeding conditions in the RAS and for intake of artificial pelleted feed. Special attention was focused on the influence of light regime on the success of adaptation and the rate of cannibalism. The experiment was divided into six groups with different light regimes (L8 : D16, L4 : D8 : L4 : D8, L12 : D12, L4 : D4 : L4 : D4 : L4 : D4, L16 : D8, L8 : D4 : L8 : D4). Into each group were putted 3,600 pieces of pike larvae, which means 20 pcs/l. Feeding was carried out manually in 15 minutes time interval. Daily mortality was recorded and biometric measurements were conducted. After 15 days, the experiment was evaluated. Adaptation for intake of pelleted feed was successful. As was found out, the light regime has the influence on survival, cannibalism and growth of northern pike in RAS. The highest final piece weight was achieved under the light regime L16 : D8 (W= 0,13135 ? 0,02924 g). The lowest final piece weight was achieved under the light regime L8 : D16 (W= 0,06296 ? 0,01306 g). The highest survival was achieved under the light regime L8 : D4 : L8 : D4 (61,36 %), the worst under the light regime L4 : D8 : L4 : D8 (28,33 %).
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