Despite their miniscule dimensions, the rotifers in the genus Brachionus have found a notable use in modern society. Often considered the most important living prey of fish larvae, the diminutive animals are heavily utilized in aquaculture. Their high nutritional value and ease of cultivation have inspired numerous hatchery managers to ensure their continual production. Their importance is further emphasized by the numerous studies that have been carried out to determine the protocols that most greatly contribute to high densities of rotifer populations. Brachionus species are, however, sometimes alternatively utilized as bioassay organisms or pollution indicators, rather than as a link in the commercial food chain.