Barramundi is native to Australia, and is both caught in wild fisheries and farmed. Farmed barramundi is mainly produced on land in tanks and ponds (better), with minor volumes produced in the ocean in sea cages. Farming barramundi has a relatively low impact on the natural environment. Farmed Barramundi are usually marketed as ‘Baby’ or ‘Plate sized’, at about 30cm and under 2kg. (Restaurants like consistency in the size.
Barramundi is also imported from Asia, usually filleted and frozen. Definitely avoid this type of Barra’. A similar fish, Nile Perch, is imported from Africa. It cannot be legally sold as Barramundi, though mislabeling can and does occur. Look for wild Barramundi, ideally.