Pseudanodonta complanata was surveyed in 1996 and 1997 in large rivers of Broadland (Yare, Bure, Ant, Thurne and Waveney, and some associated Broads), and large rivers and drains of the Great Ouse catchment (Great and Little Ouse, New and Old Bedford, Counter Drain, Wissey, Cut-off Channel, Flood Relief Channel). All species of mussels and sometimes other molluscs were recorded. Algae and chemistry were recorded at some rivers.
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