Cercetările ihtiohelmintofaunei diverselor specii de pești din varii biotopuri acvatice naturale şi artificiale din Re-publica Moldova au pus în evidență prezența speciei Diplostomum spathaceum (Rudolphi, 1819) Olsson, 1876 la speciile de peşti: boarță-europeană – Rhodeus amarus (Bloch, 1782) (EI–35,0%, II–1-13 ex.); sânger – Hypophthalmichthys molitrix (Valencienne, 1884) (EI–60,0%, II–1-13 ex.); caras – Carassius auratus sensu lato (EI–27,0%, II–1-7 ex.); batcă-comună – Blicca bjoerkna (Linnaeus, 1758) (EI–86,6%, II–10-50 ex.); sorete – Lepomis gibbosus (Linnaeus, 1758) (EI–80,0%, II–1-7 ex.); stronghil – Neogobius melanostomus (Pallas, 1814) (EI–67,0%, II–3-8 ex.); moacă-de-brădiș-vestic – Proterorhinus semilunaris (Heckel, 1837) (EI–35,0%, II–3-160 ex.). Speciile de pești ghiborț-comun (Gymnocephalus cernua (Linnaeus, 1758) și obleț-comun (Alburnus alburnus (Linnaeus, 1758)) erau infestate nesemnificativ. În dependenţă de nivelul de infestare cu D. spathaceum, s-au remarcat leziuni specifice formei cronice de diplostomoză. De asemenea, datorită par-ticularităților structurale ale cristalinului globului ocular, specia de peşti Perccottus glenii Dybowski, 1877, manifestă o rezistență înaltă faţă de agresiunea parazitară a cercarilor speciei D. spathaceum.

The research of helminth fauna of different fishes from different natural and artificial aquatic biotopes from the Republic of Moldova has revealed the presence of the species Diplostomum spathaceum (Rudolphi, 1819) Olsson, 1876 in the fishes: european bitterling – Rhodeus amarus (Bloch, 1782) (EI–35%, II–1-13 ex.); silver carp – Hypophthalmichthys molitrix (Valencienne, 1884) (EI–60%, II–1-13 ex.), Carassius auratus sensu lato (EI–27%, II–1-7 ex.); white bream – Blicca bjoerkna (Linnaeus, 1758) (EI–86,6%, II–10-50 ex.); pumpkinseed – Lepomis gibbosus (Linnaeus, 1758) (EI–80%, II–1-7ex.); round goby – Neogobius melanostomus (Pallas, 1814) (EI–67%, II–3-8 ex.); western tubenose goby – Proterorhinus semilunaris (Heckel, 1837) (EI–35%, II–3-160 ex.). The fish species ruffe – Gymnocephalus cernua (Linnaeus, 1758) and bleak – Alburnus alburnus (Linnaeus, 1758) were insignificantly infested. Depending on the level of infestation with D. spathaceum, lesions specific to the chronic form of diplostomiasis were noted. Also, due to the structural features of the eyeball crystalline, the chinese sleeper Perccottus glenii Dybowski, 1877 exhibits a high resistance to parasitic aggression of the cercariae of D. spathaceum.