I was doing a tank clean and put the barra's and my catfish into a plastic container, threw a 30cm ruler in for a reference to size. It's about 4 months since I bought them from the store when they were about 4 cm, so this gives you a bit of a reference to how quick Barramundi will grow.
I'd give you an update, if I had the fish to do so, lol. They had to do the harold holt when I couldn't afford to get a bigger tank like I had previously planned to.