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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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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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