of patients, a small percentage of patients are hospitalized annually for fevers, chills, muscle spasms, and serious burns. Blooms of jellyfish may also impact economic stability in surrounding communities, due to overfishing which alters trophic processes. As jellyfish overpopulate ecosystems, they may wipe out large numbers of fish in their habitat. Blooms occur because of changes in temperature and phytoplankton abundance in the ecosystem. References Cepheidae Scyphozoan genera