nounplural noun rainbowfish, plural noun rainbowfishes

• Any of a number of small brightly coloured fish of warm waters.

  an Australian freshwater fish (genus Melanotaenia, family Melanotaenidae).
  ('Celebes rainbowfish') a freshwater fish native to Sulawesi and popular in aquaria (Telmatherina ladigesi, family Atherinidae).

  ‘Visual cues alone allow for the expression of a preference for familiars in guppies and rainbowfish.’

  More example sentences

  • ‘Surface feeders such as rainbowfish will benefit greatly from feeding vinegar eels, but a lot of cichlid fry are bottom feeders.’