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Crayfish are helping this brewery keep its water supply pure

By
Reuters
Published Sep. 28, 2017, 1:04 p.m. ET
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A crayfish sits inside a fish tank in a laboratory of Faculty of Fisheries and Protection of Waters in Vodnany
A crayfish sits inside a fish tank in a laboratory of Faculty of Fisheries and Protection of Waters in Vodnany, Czech Republic. Reuters
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A crayfish rests on a bubble filter inside a fish tank in a laboratory of Faculty of Fisheries and Protection of Waters in Vodnany
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… Reuters
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Scientists from the Faculty of Fisheries and Protection of Waters attach a sensor on a crayfish at Protivin brewery.
Scientists from the Faculty of Fisheries and Protection of Waters attach a sensor on a crayfish at Protivin brewery. Reuters