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Studies on feeding of V. viviparus were carried out in the years 1995–2005 in dam reservoir (Zegrzyński Reservoir, Central Poland, 60 km long, mean depth ca 3.5 m, maximum depth at the dam up to 9 m, mean retention time from 1 to 15 days) and in the outlets of its tributaries (the Bug, Narew and Rządza rivers), in the Narew River and – in the years 2003–2006 – also in oxbow lakes of the Bug River...
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