Macquaria ambigua
Golden Perch (also Yellowbelly, Callop)
Species Summary
A large, hardy inland native, Macquaria ambigua carries several common names depending on where in Australia you find it — Yellowbelly is probably the most widely used, alongside Golden Perch and Callop. Juveniles are a light gold, adults a darker green with a gold-toned underside; it may not be the most colourful native fish, but it makes an unusually engaging aquarium subject given its size and character.
Keeping & Caring
Wild-caught fish, generally taken by hook rather than net, transport surprisingly well: two 5 kg fish have been carried two hours in a 60-litre plastic drum with nothing more than a battery-powered air pump, and even fish longer than their container can be safely moved by gently bending the tail before sealing the lid. Macquaria ambigua changes its hunting style with age — young fish actively hunt and need plenty of room to do so, while older fish become ambush predators, sitting still and letting food come to them — so paradoxically, smaller fish need more swimming space than larger ones. A tank about three times a large fish’s length, and a little more than its length wide, is sufficient for an adult. No heater is required, and being an inland-river native, water quality is not especially critical. Adjustment to captivity is rapid, with feeding typically starting within two or three days, and after three or four weeks fish begin recognising and following their keeper, some becoming tame enough to hand-feed or even be patted gently under the chin. The main husbandry hazard is that wild-caught fish often carry anchor worm eggs, which can take three to four weeks to hatch in the enclosed aquarium environment, so new arrivals are worth watching closely.
Diet
A violent feeder that will take prey close to its own size — a 15 cm goldfish consumed in a single bite is not unusual, and careless fingers offering food by hand can expect to get caught. Live food is strongly preferred; frozen prawns or pieces of fish are accepted but with noticeably less enthusiasm.
Compiled for Home of the Rainbowfish from ANGFA sources: N. Cheeseman, “Keeping & Caring — Macquaria ambigua (Yellowbelly/Golden Perch)”, Qld Newsletter 5(4), 1989.