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Problem of toxic bloom is one of major threats for number of drinking and recreational water bodies in the Czech Republic (about 70% of all surface reservoirs are affected). Research and management of toxic blooms have long-term tradition in the country since early 1990s that resulted in both scientific advances as well as regulatory actions.

Regulations in the Czech Republic follows recommendations of WHO and regulation for bathing waters (based on numbers of cyanobacterial cells, biovolume or chlorophyll-a, respectively). Also drinking water regulation in the Czech Republic requires analyses of microcystin-LR (with limit of 1 μg/L), and water companies are aware and monitor toxin concentration at least once per week in treated water.


CYLINDROSPERMOPSIN in the Czech Republic.

Map of the Czech Republic with sites sampled in 2007. FILLED symbols indicate localities with occurrence of Aphanizomenon sp. in more than 10% of dominance, EMPTY symbols  indicate localities with presence of Aphanizomenon sp. in less than 10% dominance. Size of symbols characterizes surface areas of the reservoirs (smaller circles <100 ha, larger >100 ha). Black spot indicates localities where cylindrospermopsin was detected. Localities with occurrence of Cylindrospermopsis raciborskii are highlighted by names (from Bláhová et al. 2009 doi:10.1016/j.toxicon.2009.01.014)

(by Ludek Blaha on 2015-02-20)