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Rainbow trout
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=== Water purification === [[File:Detektor znečištění pstruh duhový ÚV Káraný.jpg|thumb|Rainbow trout in a water purification facility]] Rainbow trout is sometimes used as a biological indicator for [[water quality]] in [[water purification]] facilities.<ref>{{Cite report|last1=Pokorny|first1=J.|last2=Randak|first2=T.|date=2001|title=Use of rainbow trout for checking water inflowing to the drinking water purification plants|url=http://agris.fao.org/agris-search/search.do?recordID=CZ2003000722|language=cs|publisher=Jihoceska Univerzita|access-date=2019-07-06|archive-date=2022-01-29|archive-url=https://web.archive.org/web/20220129070541/https://agris.fao.org/agris-search/search.do?recordID=CZ2003000722|url-status=dead}}</ref>
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