Microphotographs of the helminth parasites found in invasive fish in the present study: (a,b) Corynosoma semerme, live ex N. melanostomus (voucher, PQ570008, PQ557260); (c) Archigetes sieboldi, live ex N. melanostomus (voucher PQ570009); (d) Eubothrium crassum, live ex N. melanostomus (voucher, PQ570012); (e,f) Paradilepis scolecina, live ex N. melanostomus (voucher, PQ570010); (g) Bucephalus polymorphus, live, encysted ex N. fluviatilis (voucher, PQ582078, PQ560767); (h) B. polymorphus, live, encysted ex N. fluviatilis (voucher, PQ560768); (i) B. polymorphus, live, excysted ex N. fluviatilis (voucher, PQ560766); (j) Rhipidocotyle campanula, live ex Ps. parva (voucher, PQ560769); (k) Rhi. fennica, live ex Ps. parva (voucher, PQ560773); (l) Cyathocotyle prussica ex N. melanostomus (voucher, PQ560792).