Not sure about that, Adrienne, but I'm sure they would have figured a way to do that as well..
Malcolm, the asian arowanas worth having are all technically endangered and are only allowed to be bred by licensed fish farms in Asia. But legality aside, you'll first need an indoor swimming pool with a constant temperature of about 28 deg C, a bunch of high-grade arowanas and plenty of time. From my understanding and reading, in order to find a breeding pair, you must first raise a batch of juveniles and watch which ones pair up. Then you've got to wait for them to reach maturity. From then on, it's all downhill. All you need to do is provide breeding conditions, wait for the father to release the fry from his mouth, then raise the fry as your own. Easy peasy.
So.. Time to start :digH: your backyard to install that indoor swimming pool!