Native Australian fish for the aquarium
Most fish in the hobby are tropical imports, kept in water carefully adjusted to suit them. Australia's own freshwater fish flip that around: many are already perfectly matched to the water that comes out of your tap, and they bring a distinctiveness and a sense of place that an imported community cannot. This guide covers why natives are such a good fit for an Australian tank, where to get them properly, and four genuinely rewarding species to start with.
Published 23 June 2026 · Last updated 23 June 2026 · 12 min read
Why keep Australian natives
Native fish are not just a patriotic novelty. For an Australian keeper they have real, practical advantages.
- They suit your water. Much of Australia has hard, alkaline tap water, which is exactly what species like the Murray River rainbowfish and Pacific blue eye want. Instead of fighting your water with chemicals to keep soft-water tetras, you can keep fish that thrive in it untouched.
- Many are hardy and cool-tolerant. Several natives come from temperate rivers and shrug off cooler temperatures, so they suit an unheated or lightly heated tank across the southern states, which saves running a heater year-round.
- They are genuinely distinctive. A tank of native rainbowfish and blue-eyes looks like nobody else's, and the males of these species spend the day flaring their fins and displaying to one another, which is the real reason to keep them.
- They connect you to local fauna. Keeping local species builds an awareness of Australia's freshwater life and the pressures it faces, and supports a small, knowledgeable community of specialist breeders.
Where natives come from, and the law
This is the part that sets native fish apart, and it is worth getting right.
Buy captive-bred. The natives in the aquarium trade are bred in captivity by hobbyists and specialist breeders, not scooped from creeks. Captive-bred fish are healthier, already used to tank life and prepared foods, and they take no pressure off wild populations. Good aquarium shops stock the common natives or can order them in, and specialist breeders supply the rest.
Collecting from the wild is regulated, and it varies by state. Taking fish from Australian waters is governed by state fisheries law: recreational fishing rules, bag limits, protected species, and protected waters all apply, and some areas and species are off-limits entirely. The rules differ from state to state, so if you ever intend to collect, check with your state fisheries authority first. For most keepers, buying captive-bred is simpler, legal everywhere, and kinder to wild stocks.
Find the community. The hub for native fishkeeping is ANGFA, the Australia New Guinea Fishes Association, whose members breed, trade, and document these species and run the meetings and sales where the less common ones change hands. Native Fish Australia is another good resource. Between a local aquarium shop and a club like ANGFA, you can source almost any aquarium-suitable native without ever lifting a net in the wild.
Match natives to your water and climate
The trick with natives, as with any fish, is to choose species that already suit your water and your room temperature rather than engineering conditions to fit them. Australian natives split neatly into two groups on this.
Hard, alkaline, cool-tolerant. The Murray River rainbowfish and Pacific blue eye come from temperate and coastal eastern Australia. They want hard, alkaline water (the default across much of the country) and tolerate cool temperatures, so they suit an unheated tank in the southern states. If your tap water is hard, these are close to plug-and-play.
Soft, warm, tropical-north. Gertrude's blue eye and the threadfin rainbowfish come from the soft, often tannin-stained waters of the tropical north. They want warmth (a heater) and softer, more acidic water, and they look their best in a planted, dimly lit, blackwater-style nano tank. In naturally soft Melbourne water they are an easy fit; elsewhere they suit a dedicated soft-water setup.
Our guide to the best freshwater fish for Australian tap water maps the regions in detail, and the water parameters guide explains the numbers. Whichever group suits you, check the plan in the stocking calculator before you buy.
Four natives to start with
These four are widely bred, genuinely aquarium-suited, and between them cover hard and soft water, cool and warm tanks, and nano to centrepiece sizes. Tap each for the full picture, or open its complete care guide.
Murray River rainbowfish
Australia's own rainbowfish, from the temperate Murray-Darling system, and the easiest native to start with. It grows to a solid 8 to 11 cm, lives 5 to 8 years, and the males flush with warm orange-red fins over a silvery, crimson-flecked body when they display. Two things make it ideal here: it tolerates cool water (16 to 26°C), so it suits an unheated tank in the southern states, and it wants hard, alkaline water (pH 7.0 to 8.5), exactly what comes out of the tap across much of the country. Hardy, peaceful, and long-lived, it is the natural centrepiece for a hard-water or Murray-Darling tank. Keep a group of six or more in 110 litres or larger, and skip the tiniest nano tankmates and shrimp, which it will eat. Full care guide.
Pacific blue eye
A 3 to 4 cm jewel from the coastal streams and estuaries of eastern Australia. The luminous blue eye gives it its name, and a group of males spends the day fanning out their fins and sparring harmlessly in a shimmer of pale blue and yellow. It thrives in the hard, alkaline coastal tap water of the eastern seaboard (pH 7.0 to 8.0), even tolerates a little salt, and copes with a wide temperature range (16 to 28°C). Its tiny mouth makes it genuinely shrimp-safe, even with shrimplets, but also means anything large enough to eat a 3 cm fish eventually will, so keep it only with other nano species. Short-lived and a touch particular about fine foods, so keep a group of at least eight in 60 litres or more. Full care guide.
Gertrude's blue eye
A second native blue eye, smaller again at barely 3 cm, patterned with fine dark spots and lit by the same brilliant blue eye. Unlike its hard-water cousin, the spotted blue eye comes from the soft, tannin-stained streams of tropical northern Australia, so it wants warmer (24 to 28°C), softer, slightly acidic water (pH 5.5 to 7.5) and shows beautifully in a planted, dimly lit blackwater nano tank. The males flare their spotted, yellow-tipped fins at one another all day. It is shrimp-safe, short-lived (often one to two years), and needs small foods and a group of eight or more in 40 litres or larger. A jewel for a dedicated soft-water nano. Full care guide.
Threadfin rainbowfish
The connoisseur's native: a 4 to 5 cm rainbowfish from northern Australia and southern New Guinea, the males trailing extravagant black thread-like fin extensions they flick and fan in constant display, over a body of soft red and blue. That beauty comes with demands. It has a minute mouth and feeds slowly, so it needs small foods and calm tankmates that will not beat it to every meal (even guppies and danios outcompete it), and its long fins are a magnet for any nipper. Keep it warm (23 to 30°C), in soft to moderate water, in a planted, gently filtered, mature tank, in a group of six or more with a few rival males to draw out their finnage. Not a beginner's fish, but among the most beautiful small fish you can keep. Full care guide.
Building a native tank
The most satisfying way to keep natives is a tank built around the conditions they share. Two templates cover the four fish above.
A hard-water, cool tank
Built around the Murray River rainbowfish as a centrepiece, with a group of Pacific blue eyes shoaling near the surface. Hard, alkaline water suits both, no adjustment needed in most of the country, and neither demands a heater in the southern states, so this can be a genuinely low-running-cost tank. Hardy white cloud minnows and rosy barbs are cool-water community fish that share the conditions if you want more movement. Plant it with native Vallisneria, a tough, tall grass-like plant that thrives in hard water (see our planted tank basics guide), over a neutral sand or gravel.
A soft, warm blackwater nano
A heated nano tank, around 26°C, for Gertrude's blue eye or the threadfin rainbowfish, densely planted and gently filtered, with soft, slightly acidic, tannin-stained water from leaf litter or botanicals and subdued lighting. Both are tiny and slow, so their tankmates must be tiny and calm too: celestial pearl danios, chili rasboras, ember tetras, pygmy corydoras, and cherry shrimp, all of which are safe with them. This is a jewel-box tank rather than a busy community.
Whichever you build, three rules apply to all the natives here: keep each species in a proper group (six to eight or more) so the males colour up and display, feed small foods because these are small-mouthed fish, and match tankmates by water, temperature, and size. Run the plan through the stocking calculator and read our guide to stocking a community tank for the full method.
Beyond the four: the wider native scene
These four are a first step, not the whole list. Australia and its near neighbour New Guinea are home to a wealth of aquarium-suited fish, which is why the hobby body covers both. Once you are hooked, these are worth seeking out through shops and clubs:
- More rainbowfish. The ornate rainbowfish or "Rhad" (Rhadinocentrus ornatus) is a soft-water gem from the east coast, and there are many larger Melanotaenia rainbowfish in spectacular colours for bigger tanks.
- More blue-eyes. The honey blue-eye (Pseudomugil mellis) and other Pseudomugil species are tiny, peaceful, and every bit as charming as the two above.
- Gudgeons. The empire gudgeon (Hypseleotris compressa), which colours up spectacularly when breeding, and the purple-spotted gudgeon (Mogurnda) are characterful, hardy natives.
- Oddities. Desert gobies (Chlamydogobius) are tough little fish from the arid centre, for keepers who like something unusual.
Two cautions. Many of Australia's best-known natives, such as Murray cod, silver perch, and the various grunters, grow far too large for a home aquarium and belong in ponds or very large tanks, so choose species sized for your tank. And because translocation rules differ by state, a few natives are restricted in some places, so confirm a species is legal to keep where you live before you buy.
Pair this with our guides on the best freshwater fish for Australian tap water, water parameters, and stocking a community tank, or browse the species directory for full care guides.