Ctenophora predation by ctenophores may control the populations of small zooplanktonic organisms such as copepods, which might otherwise wipe out the phytoplankton (planktonic plants), which are a vital part of marine food chains. Almost all ctenophores are predators – there are no vegetarians and only one genus that is partly parasitic. If food is plentiful, they can eat 10 times their own weight per day. While "Beroe" preys mainly on other ctenophores, other surface-water species prey on zooplankton (planktonic animals) ranging in size from the microscopic, including mollusc and fish larvae, to small adult crustaceans such as copepods, amphipods, and even
Hawaiian freshwater goby Hawaiian freshwater goby The Hawaiian freshwater goby, "Lentipes concolor" ("‘o‘opu ‘alamo‘o "or "‘o‘opu hi‘u koleis"), is a species of goby endemic to Hawaii, where it occurs in mountain streams. Males of this species can reach a standard length of , while females only reach . This species is important to the native people as a food fish. In Ancient Hawaiʻi, this species, and others such as mullet and "Kuhlia sandvicensis", were cultivated in a form of freshwater aquaponics or aquatic polyculture. In this system of farming, the taro in the upland paddies (taro being the primary staple in Ancient Hawaiʻi)