Definition of fingerfish in English:
fingerfish
nounPlural fingerfishesˈfɪŋɡəfɪʃ
A small silvery fish with a deep laterally compressed body, occurring in warm inshore and estuarine waters and popular in aquaria.
Family Monodactylidae and genus Monodactylus: several species
Also called moonfish
Origin
Late 18th century: from the genus name monodactylus, literally 'single finger'.