Evynnis tumifrons, the yellowback seabream, crimson seabream, goldentail or red seabream, is a species of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. This fish is found in the Western Pacific Ocean off the coasts of East Asia. This species is an important food fish in the East China Sea and Japan.

Taxonomy Evynnis tumifrons was first formally described as Chrysophrys tumifrons in 1843 by the Dutch zoologist Coenraad Jacob Temminck and the German zoologist Hermann Schlegel with its type locality given as Japan. In 1931 the Japanese ichthyologist Shigeho Tanaka renamed Chrysophrys cardinalis, also described by Temminck and Schegel, as Evyniis japonica because Sparus cardinalis had been named by Bernard Germain de Lacépède in 1802. Temminck and Schlegel had used two types in their description of C. tumifrons and the larger of the two was shown to be an example of E. japonica while the smaller is a specimen of Dentex hypselosomus, so Tanaka's E. japonica is a junior synonym of Chrysophrys tumifrons. The genus Evynnis is placed in the family Sparidae within the order Spariformes by the 5th edition of Fishes of the World. Some authorities classify this genus in the subfamily Sparinae, but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae.

Etymology Evynnis tumifrons has the specific name tumifrons which combines tumis, meaning a "swelling", with frons meaning "front" or "forehead", an allusion to the bulge close to the eyes, especially prominent in larger specimens.

Description Evynnis tumifrons has a robust, compressed and deep body, with the depth of its head being markedly greater than its length.