The proximate effects predators can have on prey behavior are well known. Few studies, though, have quantified the effects that a prolonged exposure to a predator could have on prey growth. In the laboratory, young-of-year fathead minnows (Pimephales promelas) were protected from largemouth bass (Micropterus salmoides) predation by a perforated plexiglass partition. Minnows within the enclosure were allowed to witness bass predation of conspecifics outside the enclosure.