 Commonly, all species of bacteria will be prey, but spores of some species, such as "Clostridium perfringens", will never be prey, because of their cellular attributes.Bacterivores can sometimes be a problem in microbiology studies.For instance, when scientists seek to assess microorganisms in samples from the environment (such as freshwater), the samples will often be contaminated with bacterivores, which will interfere with the growing of bacteria for study.