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Stravitelnost krmiv pro kapra obecného
MAREŠ, Josef
This bachelor thesis evaluates the composition and apparent digestibility of various types of fish feed and various ingredients applicable to the feeding of common carp. This bachelor thesis also evaluates the suitability of individual components based on the digestibility of individual nutrients. The results show that the right combination of fish feed improves efficiency, reduces feed consumption and increases growth. Last but not least, the negative impact of feeding on the quality of the aquatic environment should be reduced. This bachelor thesis summarizes existing digestibility values of individual feed ingredients for common carp and then its own experiment, which was very time- consuming. Some already known values have been confirmed and some new information about the content of individual components of feed and their subsequent use has been found. The results for wheat and maize were compared with results of other authors. Triticale, daphnia and chironomidae larvae were used for the first time, so the values could not be compared, nevertheless it could be used as a basic information for further research in this area. The average content of individual cereal parameters were: 16% protein content and 64% digestibility, 2% fat content and 70% digestibility, 74% BNLV content and 74% digestibility. Fiber content 5% and ash content 2% with very low digestibility. Phosphorus content 0.6% and digestibility 30%. Average content of individual parameters for natural foods was: protein content 55% and digestibility 86%, fat content 5% and digestibility 74%, BNLV 20% and digestibility 41 %, fiber content 7% and digestibility 8%, ash content 14% and digestibility 30%, phosphorus content 1.2% and 74% digestibility. The resulting element was to determine the most suitable feed for pond aquaculture. According to the available results, wheat combined with natural food is the best option. Wheat is very energy rich, but has a low protein content. Conversely, natural food is energy rich in easily usable protein. The optimal ratio of natural food to wheat was 0.25:2. With this ratio we can meet the ideal nutritional requirements of common carp (31% digestible protein, 0.6-0.7 % phosphorus, 3200 kcal?kg-1 digestible energy). With the right feed, we are able to reduce the negative impact on water quality and this is one of the main goals for the future.
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The impact of zooplankton on carp production in Bohelov ponds
ŠINDLER, Martin
Zooplankton dynamics and the changing parameters of pond water in Bohelov ponds was monitored by regular sampling of zooplankton at approximately weekly intervals from April to October 2014 with sampling Schlott-Bauer method in a volume of 20 and 60 liters. The samples were divided into taxonomic groups and species, classified in so-called filterable zooplankton over 500 m. From the pond water parameters was monitored oxygen, pH, temperature, transparency and acid neutralizing capacity and their impact on production in ponds. Control fish out in each month showed a direct correlation with the increase in biomass Common carp (Cyprinus carpio) on the abundance of filterable zooplankton comparing the pond no. 1 and 3. Stocking was fed with feed wheat (Triticum) during the season. The abundance of zooplankton was different in different ponds and gradually changed by increasing fish stocking. A greater abundance of filterable zooplankton of Daphnia - Cladocera and lower species was noticed in the pond no. 1 as in the pond no. 3. With the increasing biomass of fish stocking has been demonstrated reduced of filtrable zooplankton where the number of small zooplankton (< 500 m) ind.l-1. Zooplankton was represented particularly by species Bosmina longirostris, Chydorus sphaericus, Daphnia galeata, D. parvula, D. ambigua. In order copepods - Copepoda were seen mainly nauplius and copepod stages of type Acanthocyclops americanus, rotifers were represented mainly by Brachionus sp. and Polyartha sp.. Increased abundance of filterable zooplankton has a impact on the final amount of biomass of fish stocking expressed by growth SGR (% .day-1) and a reduction coefficient relative FCR. Due to intensive farming combined with farming of poultry during the last decades has been observated accelerated eutrophication process of reducing the size of the littoral zone with a share of macrophytes.
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Productive efficiency of modified feed in culture of market carp in the storage ponds experiment at Třeboň fisheries.
MELKA, Václav
The aim of this bachelor thesis was to verify the productive efficiency of thermally and mechanically modified wheat in comparison to the non-modified wheat in experimental fish ponds. The experiment was conducted in storage ponds of Třeboň Fisheries Ltd. and took place along 120 days in 8 rectangular ponds. Four treatments were used: thermally wheat, thermally and pressed wheat, non-modified wheat, and control without feeding. Each treatment was run in duplicate. Fish were fed three times a week early in the morning and in the same part of the storage pond. Every month, fish were harvested and some parametres were recorded (weight, length and fat content). Then, fish were restocked. The results of the productive indicators at the end of the experiment have proved a positive influence of thermal and mechanical modifications on the productive efficiency. The highest productive efficiency was achieved by the carps which have been fed by thermally and pressed wheat: Food convertion ration (FCR) was 2.17 - 0.17; Food Convertion efficiency (FCE) was 0.47 - 0.04; and Specific Growth Rate (SGR) was 0.63 - 0.06 %.d-1. Fish fed with thermally treated wheat reached values for FCR of 2.32 - 0.16; FCE of 0.44 - 0.04; and SGR of 0.60 - 0.06 %.d-1. Finally, the lowest productive efficiency was found at the wheat without any modifications (FCR: 2.38 - 0.10; FCE: 0.43 - 0.02; SGR: 0.58 - 0.07%.d-1). Therefore, thermal and mechanical modifications of wheat are positive modifications to improve production efficiency in market carp farming.
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The Use of Mechanically Modified Cereals in Semi ? Intensive Culture of Market Carp
VODÁREK, Michal
120 day feeding experiment was executed on the Trebon fishponds in the area of feeding the market carp. The aim was to determine what way of cereals processing will have favorable effects in terms of production efficiency in the mechanical processed cereal by grinding and mashing in comparison with cereal without processing. The theoretical part focuses on the characteristics of natural food, technology feeding, feed distribution and appropriate processing to achieve high growth results in common carp (Cyprinus carpio). The practical part includes the methodology and results of the production parameters of carp fed by triticale without processing, by grinding and mashing. The highest feed efficiency was observed in carps under supplementary by triticale mashed feeding with FCR 0.83; 1.21 kg of FCE and FCR / SGR; 1.05; the highest growth rate was achieved in carp under supplementary by grinded triticale (1,2 mm) feeding with SGR: 0.86 %.d-1.; worse results were observed in carp feeding by triticale without processing: FCR: 1.27; FCE: 0.79 kg; FCR / SGR: 1.61; SGR: 0.79 %.d-1.
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Semiartificial spawning pikeperch and fingerling-scale reading in Fishery Hluboká
MACÁK, Miroslav
Semiartificial spawning does in fishbastion Cejkovice in the area Ostrov. In the year 2006 was count the produktivity hen fish in a pond 7. After incubation was monitored intensity growth rate fingerling in fingerling pond, next species and size variability natural food and her effect in growth rate. Were writed basic physical and chemistry waters (temperature, pH, content O2). Owing to absence of waters and absence of size fit zooplankton was hunted very little of pikeperch fingerling.
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