in taxon grunter family silver perch Bidyan perch Silver perch (*Bidyanus bidyanus*) is a medium sized freshwater fish endemic to the Murray-Darling river system in south-eastern Australia. The scientific name comes from an aboriginal name for the species recorded by Major Mitchell on his 1832 expedition. It is not a perch, being a grunter in the family *Terapontidae*. It is the largest of the Australian grunters, capable of growing to 40 cm and 8 kg, more usually around 30 cm and up to 1.5 kg. bidyan perch bidyanus bidyanus Bidyanus bidyanus requires discussion