Sampling strategy for the treatment groups Abramis brama, Cyprinus carpio and Rutilus rutilus.

List of organs and organ numbers which have been tested for the presence of Sphaerothecum destruens DNA. Organs tested included the kidney (K), liver (L), intestine (I), gill (Gi) and gonad (Go). n: number of fish sampled.*: at 28 d.p.e. the liver, kidney and intestine of 10 C. carpio were tested for S. destruens.**: gill and gonad tissues were analyzed in only 13 of the 22 R. rutilus mortalities.