Acanthopagrus australis, the yellowfin bream, also known as sea bream, surf bream, silver bream or eastern black bream, is a species of marine and freshwater fish of the porgy family, Sparidae. It is a deep-bodied fish, occasionally confused with Acanthopagrus butcheri (black bream), but is generally distinguished by its yellowish ventral and anal fins. It is a popular target for recreational fishermen due to its capacity to fight well above its weight coupled with its table quality.

Taxonomy A. australis is one of 20 species in the genus Acanthopagrus, part of the porgy family Sparidae. The species was first mentioned in scientific literature by Richard Owen in an 1853 work on skeletal material held by the Museum of the Royal College of Surgeons of England. Although he named it Chrysophrys australis, it was insufficiently described and hence designated a nomen nudum. German-British naturalist Albert Günther formally described the surf bream in 1859 using Owen's name. Allan Riverstone McCulloch classified it in the genus Sparus in 1929. Texts up till 1949 used either of these binomial combinations. Ian Munro used the binomial name Mylio australis in a 1949 review of the Australian "silver breams", preferring Mylio over Acanthopagrus and Roughleya as he found it to be the oldest valid genus name available.