This diploma thesis deals with recirculating aquaculture systems (RAS) in terms of their effects on quality of surface water. In the theoretical part, recirculating aquaculture systems, physicochemical parameters of water, eutrophication and fish species that were part of the experiment were described. The methodological part was focused on the detailed description of sampling, parts of the recirculating system, used feed, the origin of reared fish and methods for determination of the individual physicochemical parameters of water and sediment. Samples of water and sediment were collected and analyzed at the Department of Fisheries and Hydrobiology at Mendel University in Brno. In the practical part, the physicochemical parameters were evaluated depending on the number of fish in the system, the daily ration and the type of feed used. It was found that the ammoniacal nitrogen content of the recirculating systems is mainly dependent on the number of fish, the nitrite nitrogen content per daily feed rate, the higher the nitrate content coincides with the minimum water change and the nitrification, the amount of extractable phosphorus in the sediment depends on the type of feed used as well as the total nitrogen content. The smallest impact of phosphorus and nitrogen emissions was demonstrated in the BIOMAR Efico Enviro 920 Advance 4.5 mm feed, which also contained the highest organic content.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:430246 |
| Date | January 2017 |
| Creators | Mrkvica, Aleš |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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