Pet Breed Guide NZ
Rainbowfish
Rainbowfish are vibrant, peaceful freshwater fish native to the clear waters of Australia and New Guinea, celebrated for their stunning iridescent colours that truly come alive under appropriate aquarium lighting. These small, active schooling fish make a captivating and dynamic addition to a well-maintained community aquarium, typically living for 5-8 years with proper care. Their relatively easy care requirements and engaging, active behaviour make them a popular choice among Kiwi aquarists looking to add a splash of colour to their home. In New Zealand, Rainbowfish are generally legal to keep, offering a fantastic option for many enthusiasts, but prospective owners should always verify current MPI (Ministry for Primary Industries) guidance and any specific local council rules to ensure full compliance before acquiring these beautiful aquatic pets.
Photo Gallery
NZ Ownership Snapshot
Verified NZ Status- Noise Level
- quiet
- Social Needs
- groups
- Water Type
- freshwater
- Tank Size
- 40L minimum
- Diet Type
- Prepared aquarium food, frozen foods, and species-appropriate live or vegetable foods
- UVB Required
- No
Listed on Schedule 4 (Approved Species) of MPI's Import Health Standard: Ornamental Fish and Marine Invertebrates (ORNAMARI.ALL, 20 September 2021). Verified 4 September 2026. Source: https://www.mpi.govt.nz/dmsdocument/17425-Ornamental-fish-and-marine-invertebrates-from-all-countries-Import-Health-Standard
Breed Snapshot
- Size
- small
- Lifespan
- 5-8 years
- Origin
- Australia/New Guinea
- Care Focus
- Best researched for compatible tank mates, grouping, and stable water conditions.
- NZ Price
- NZD $15 - $50 per fish, depending on species, size, and rarity.
- Annual Vet Cost
- Annual vet/care costs for Rainbowfish are generally low, typically ranging from NZD $50 - $150. This primarily covers the cost of quality food, water conditioners, filter media, and occasional medications for common ailments if needed. However, it's important to note that access to exotic vets specifically for fish in New Zealand is extremely limited. Most fish health issues are managed by experienced aquarists or through advice from specialist pet stores. If a serious health issue arises requiring professional diagnosis or treatment, finding a veterinarian with expertise in aquatic medicine can be challenging and potentially costly due to scarcity. Prevention through excellent water quality and husbandry is paramount.
Personality Scores
NZ Lifestyle Fit
Rainbowfish are highly suitable for a wide range of Kiwi homes, from bustling city apartments to spacious suburban houses and even tranquil rural sections, provided they can accommodate a properly sized and maintained aquarium. Their relatively small size and inherently quiet nature make them excellent pets for those with limited space, requiring a minimum tank size of 40 litres for a small group, though a larger tank is always recommended to allow for ample swimming space and to accommodate a healthy school. While New Zealand's diverse climate, from Auckland's humidity to the South Island's colder temperatures, directly impacts outdoor conditions, it is less of a direct concern for the fish themselves, as they thrive within the controlled environment of an indoor aquarium. However, maintaining a stable indoor temperature for the tank water is crucial for their well-being, making a reliable aquarium heater an essential piece of equipment regardless of your region. There are generally no specific regional restrictions on keeping Rainbowfish within NZ, given their legal status. They can be legally sourced from most reputable pet stores specialising in aquatic life across the country, as well as from local breeders, ensuring healthy, well-acclimated fish for your home.
NZ legal status not yet verified against MPI, EPA, DOC and regional council records. Don't treat this page as confirmation that the species can legally be imported, bought, sold, bred or kept in New Zealand — check those official sources first.
About the Rainbowfish
Rainbowfish, a diverse group of freshwater fish primarily originating from the sun-drenched rivers and lakes of Australia and New Guinea, are renowned for their striking beauty and active schooling behaviour. These small to medium-sized fish typically boast a lifespan of 5-8 years in a well-maintained aquarium, offering years of enjoyment to their keepers. Their natural habitats range from slow-moving streams to clear, fast-flowing rivers, influencing their adaptable nature in captivity. They are freshwater species, thriving in stable water parameters and a clean environment.
What They Look Like
The appearance of Rainbowfish varies significantly across their many species, but common traits include a somewhat elongated, laterally compressed body, often with two dorsal fins. Their most defining characteristic is their incredible colouration, which can range from brilliant reds, oranges, and yellows to shimmering blues, greens, and purples. These colours often intensify with age, good health, and during breeding displays, creating a truly spectacular sight. Males are typically more vibrantly coloured and possess longer, more pointed fins than females. Their eyes are often large and expressive, adding to their alert and curious demeanour.
Personality & Behaviour
Rainbowfish are generally peaceful and active schooling fish, meaning they thrive when kept in groups of six or more of their own kind. This schooling behaviour not only makes them feel secure but also enhances their natural beauty and allows for fascinating social interactions within the tank. They are mid-to-upper level swimmers, constantly on the move, exploring their environment. While mostly peaceful, some larger species can be boisterous, and fin-nipping can occur if they are not kept in sufficiently large groups or if tank mates are slow-moving with long fins. They are not typically aggressive towards other species, making them excellent candidates for a community aquarium with similarly sized, peaceful fish.
Life in New Zealand
For Kiwi pet enthusiasts, Rainbowfish present a generally legal and accessible option for a freshwater aquarium. Their status as a legal species in New Zealand means they can be sourced from reputable pet stores and breeders across the country. However, as with all exotic pets, prospective owners must adhere to the mandatory legal instruction: always check current MPI (Ministry for Primary Industries) guidance and any specific local council rules before acquiring a Rainbowfish. While climate considerations like Auckland's humidity or the South Island's cold are less direct concerns for indoor aquarium fish, maintaining stable indoor temperatures and humidity is crucial for the overall well-being of the fish and the integrity of the aquarium setup. Ensuring a consistent environment is key to their long-term health.
Is This the Right Pet for You?
If you're looking for an active, colourful, and relatively easy-to-care-for freshwater fish that brings vibrant energy to your home, Rainbowfish could be an ideal choice. They require a commitment to maintaining stable water quality and a suitable tank environment, including appropriate tank size (minimum 40L, larger for groups) and compatible tank mates. Their social nature means they thrive in groups, so be prepared to house several. While generally peaceful, their active swimming style and potential for boisterousness mean they are best suited for community tanks with other active, non-aggressive species. For those willing to provide a well-set-up and maintained aquarium, Rainbowfish offer a rewarding and visually stunning pet experience in New Zealand.
Fun Facts
Fact 1
Rainbowfish are named for their stunning iridescent colours, which can change intensity depending on their mood, health, and lighting.
Fact 2
Many species of Rainbowfish are endemic to very specific, isolated bodies of water in Australia and New Guinea, making them unique to those regions.
Fact 3
Male Rainbowfish often "flash" their brightest colours and perform elaborate displays to attract females during breeding.
Fact 4
Some Rainbowfish species can live for over 10 years in exceptionally well-maintained aquariums, exceeding their typical 5-8 year lifespan.
Fact 5
They are known for their active schooling behaviour, which not only provides security but also enhances their visual impact in an aquarium.
Related Breeds
Betta Fish (Siamese Fighting Fish)
The Betta, or Siamese Fighting Fish, is a small, long-finned freshwater fish from the shallow rice paddies, canals and floodplains of Southeast Asia, usually kept alone because two males will not share a tank. The body reaches about 6-7 cm with the fins on top of that, and a labyrinth organ lets it breathe air at the surface, an adaptation to low-oxygen water that also makes it hardy in an aquarium. Males carry the long flowing fins and saturated reds, blues, greens and purples the species is known for, in forms such as veiltail, crowntail, halfmoon, plakat and doubletail; females are shorter-finned and quieter in colour. Males may also target other bright, long-finned fish, so tank mates need choosing with care. A single Betta needs at least 40 litres, a heater holding 24-27 degrees, gentle filtration, planting and a weekly water change. Typically living two to five years, it suits a keeper who wants one characterful fish rather than a crowded community tank.
Black Moor Goldfish
Black Moor Goldfish is a small fish originating from China. It is listed on Schedule 4 (approved species) of MPI’s Import Health Standard for ornamental fish, so it can be legally imported and sold through the NZ aquarium trade. MPI classes it as a higher-risk species with additional import quarantine conditions. Typical lifespan is 10-15 years.
Bristlenose Pleco
Bristlenose Pleco is a small fish originating from South America. It is listed on Schedule 4 (approved species) of MPI’s Import Health Standard for ornamental fish, so it can be legally imported and sold through the NZ aquarium trade. Typical lifespan is 12-15 years.
Cardinal Tetra
The Cardinal Tetra (Paracheirodon axelrodi) is a small, peaceful schooling fish from the blackwater tributaries of the Orinoco and Negro rivers, known for the iridescent stripe running the full length of its body, electric blue above and deep red below. It differs from the similar Neon Tetra in that the red band runs from snout to tail rather than stopping halfway. Adults reach about 5cm and live four to five years. Cardinals are shoaling fish that need groups of six or more to feel secure; kept in ones and twos they turn shy and their colour fades. They swim actively through the middle and upper levels of a well-planted tank, and prefer soft, slightly acidic water held between 23 and 27 degrees, with around 40 litres as a minimum for a small school. Subdued lighting, live plants and driftwood suit them. A sound choice for a calm community tank in a smaller space, provided conditions stay stable.