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Splňují ryby chované v biologickém rybníku napájeném vodou z ČOV požadavky na hygienickou kvalitu masa?
KAREŠ, Martin
This bachelor thesis focuses on impact analysis of the biological pond on the hygienic quality of the fish flesh. The main aim was to analyse toxic metals, persistent organic pollutants and organoleptic quality in the muscle of common carp (Cyprinus carpio), which was influenced by treated water from the municipal sewage treatment plant (STP). The experimental fish were exposed in biological pond Čežarka supplied by STP treated water and in control pond supplied by water from Blanice river. Toxic metals (Hg, Cd, Pb, As) and persistent organic pollutants (PCB, DDT, HCH, HCB) were analysed in muscle of 4 fish groups exposed for 0, 14, 30 and 90 days. The concentration of toxic metals and POPs were compared with valid hygienic limits for fish meat. An organoleptic evaluation was made at the end of the experiment focusing on the aroma, taste, odd-taste and consistency of fish meat. All measured parameters were in compliance with legislative regulations. Concentration of neither micropollutant exceeded valid hygienic limit. The concentration of observed pollutants in fish muscle after 90 days of exposure showed that the water from sewage disposal plant is not the significant source of analysed substances in the environment. However, the treated water from the STP is significant source of PPCPs, which are not limited for the fish meat by legislative regulations.
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