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CZECH-CRAYFISH/WATER PURITY
RTS1E337 
September 27, 2017 
A crayfish rests on a bubble filter inside a fish tank in a laboratory of Faculty of Fisheries and Protection... 
VODNANY, Czech Republic 
A crayfish rests on a bubble filter inside a fish tank in a laboratory of Faculty of Fisheries and Protection... 
A crayfish rests on a bubble filter inside a fish tank in a laboratory of Faculty of Fisheries and Protection of Waters in Vodnany, Czech Republic, September 26, 2017. Picture taken September 26, 2017. REUTERS/David W Cerny 
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