Freemanichthys is a monospecific genus of marine ray-finned fish belonging to the family Agonidae. This species is found in the northwestern Pacific Ocean. It is found at depths of from 10mto300mm (30feetto1,000feetm). This species grows to a length of 22cm (09inches) TL. This only species in the genus is Freemanichthys thompsoni.