The big-scaled redfin (Pseudaspius hakonensis), also known as the Japanese dace[2] and ugui,[3] is a medium-sized Asian fish.[4] First described by
Albert Günther in 1877 as Leuciscus hakonensis,[4] it was the
type specimen of the genus Tribolodon, having been described again as Tribolodon punctatum by
Henri Émile Sauvage when he established that genus in 1883.[5] It is the most widely distributed of the Pseudaspius species, found over much of the
Sea of Japan.[6] It is known to carry a number of
parasites, including the
trematode species Centrocestus armatus (for which it is a second intermediate host),[7] and the
copepod species Ergasilus fidiformis, which is carried in the fish's
gills.[8]