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Mercury content in muscle of chub (\kur{Leuciscus cephalus}) from the downstream tributaries of the Elbe river
KOLEK, Bohuslav
Mercury content in muscle of chub (Leuciscus cephalus) from the downstream tributaries of the Elbe river. The aim of the present study was to investigate the concentration of total mercury in muscle of 141 chub (Leuciscus cephalus) from seven Czech rivers (Vltava, Berounka, Sázava, Ohře, Otava, Lužnice, Labe) and to evaluate the potential risk of eating fish from the rivers. Total mercury values results from 2011 were compared with 2010. Mercury was determined by means of cold vapour atomic absorption spectrometry using AMA-254. The highest mean concentrations of total mercury were found in the Otava-Topělec (0,240 +- 0,106 mg/kg) for year 2010 and Labe-Obříství (0,222 +- 0,102 mg/kg) for year 2011. The lowest mean concentrations of total mercury were found in the chub from the Berounka-Beroun for both years (0,053 +- 0,013 mg/kg and 0,064 +- 0,010, respectively). The fish intake hazard index calculated were between 0,1 and 0,4 for the individual tributaries monitored. The results of this study show that hygienic limit for fish product (0,5mg.kg-1) was exceeded in Otava-Topělec (0,59mg.kg-1).
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Implementation of a long distance hiking trail along the Luznice River
Jiroudková, Petra ; Jarolímková, Liběna (advisor) ; Havelka, Jan (referee)
The bachelor paper Implementation of a long distance hiking trail along the Luznice River is concerned with hiking. The main purpose of the work is to map and define a long distance trail along the Luznice River with the view of German quality trails. The trail is called "The trail along the Luznice River leads us together". As the Luznice River springs in Austria, this project will be a matter of international partnership between the Czech Republic and Austria. The aim is not only the creation of the trail, but also the cooperation and communication of two countries. The greater focus is on hiking, the Czech Tourist Club (as the Lead Partner) and the trail itself. The next part of the paper indicates the trails potential for certification. The paper provides target groups, partnership, objectives and contributions to tourism.
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HYGIENIC QUALITY OF FISH FROM SIGNIFICANT FISHING WATERS BEROUNKA 1, LUŽNICE 6, OTAVA 4, OTAVA 7 (P)
BARTOŇ, Jiří
The main aim of this study was to evaluate hygienic quality of fish from significant fishing waters: Berounka 1, Lužnice 6, Otava 4, Otava 7 (P). Sampling was performed in 2010 by electrofishing and fishing rods. 173 individuals belonging to 13 different fish species were fished. The samples of fish muscle were analysed for the following substances: Hg, Pb, Cd, PCB, DDT and its metabolites (DDE and DDD), a-HCH, b-HCH, y-HCH, HCB. Samples of bream (Abramis brama) muscle were collected at all monitored sites (exception was Otava 7) and bream was used as reference species to compare the contamination among monitored rivers. The results were compared with valid hygienic limits. The values of contamination were in most cases very low and far below the limits. Only mercury was identified as a risk contaminant in all monitored rivers. Average concentrations of mercury in the muscle of bream were in the range of 0.261-0.284 mg/kg and were comparable in all rivers. The hygienic limit for mercury (0,5 mg/kg) was exceeded only in 4 cases - one individual sample of bream from Otava, two mixed samples of asp (Aspius aspius) from Berounka and Lužnice, one mixed sample of perch (Perca fluviatilis) drom Otava. The highest value of total mercury content (0.768 mg/kg) was found in asp from Lužnice 6. All concentrations of persistent organochlorinated pollutants in fish muscle were far below the valid hygienic limits. The only health risk was posed by increased content of mercury.
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