It’s pretty simple really …
Robert likes to use trout fish. The only problem is they don’t like warm water, so get replaced with a warm water tolerant species like goldfish over summer. He grows taro, water cress, water chestnuts and arrowroot in his aquaculture garden.
And, as a bonus, he harvests the fish when they grow to sufficient size.
Robert harvests about 12 fish per year. The setup costs about $70 pa for fish food and $70 for fish fingerlings to restock the fish tank.