The aim of this thesis was to test and compare the effect of four selected and in present commonly used medical treatments on other species of fish in recirculating aquaculture system (RAS). This presented work was divided into two separate experiments dealing with curative baths for fry of pikeperch.The fry was raised in ponds, feeded by natural food, with the intention of adaptating for RAS after a bath. Baths were targeted against parasitic and bacterial diseases by using Bellasav, SAVO Original, formaldehyde and Chloramine T. The curative baths took 30 minutes after which the fish were transferred to clean water where the mortality within 24 hours and the efficacy of the preparation within 24 hours was monitored. In the first experiment were used fish with an average weight of 0.23+-0.05 g and a total lenght of 31.7+-2.5 mm at the age of 35 days. The tested doses were 0.5; 1; 1.5; 2; 5; 10 and 50 ml.m-3 for Bellasav, 1; 5; 10; 20 and 50 ml.m-3 for SAVO Original, 0.5; 1; 1.5; 2.5; 5; 10; 15; 30; 45 and 50 ml.100 l-1 for formaldehyde and 10; 20; 30; 40; 50; 100; 150 and 200 mg.l-1 for Chloramine T. The best efficacy was achieved at the concentration dose 1.5 ml.m-3 for Bellasav. The concentration dose 10 ml.m-3 of SAVO Original only reduced parasitic infection by one degree. An effective dose of formaldehyde was 1 ml.100 l-1 which reduced the parasitic infection by two degrees. The most effective preparation was Chloramine T at the concentration dose of 30 mg.l-1. In the second experiment were used fish with an average weight of 1.6+-0.4 g and a total lenght of 60.4+-3.56 mm at the age of 70 days. The tested doses were 10; 20 and 50 ml.m-3 for Bellasav, 10; 20 and 50 ml.m-3 for SAVO Original, 2.5; 5 and 10 ml.100 l-1 for formaldehyde and 40; 150 and 200 mg.l-1 for Chloramine T. The best efficacy was achieved at the concentration dose 20 ml.m-3 for Bellasav and 10 ml.m-3 for SAVO Original. The most effective dose for formaldehyde was 2.5 ml.100 l-1 which reduced the bacterial infection in fish skin by two degrees. The most effective preparation was Chloramine T again at the concentration dose 40 mg.l-1.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:320541 |
| Date | January 2017 |
| Creators | PITHARDT, Tomáš |
| 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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