Seven species of macrophytes (Sagittaria sagittifolia L., Sparganium erectum L., Typha angustifolia L., Butomus umbellatus L., Bolboschoenus maritimus (L.) Palla, Eleocharispalustris (L.) R. Br., Glyceria arundinaceae Kunth) were detected in Medvedica river, live tissues of which are populated by chironomids larvae. The most populated macrophyte is Sagitaria sagitifolia - 2298,65 ex/kg.