Above: a young male Blyth River Rainbowfish that is just starting to show some red.
Click here to see several more pictures.
When young, they are silvery and not colorful, but later when mature they become very colorful, making it worth the wait. This is also a very hardy fish.
Comments: This is a Premium Pet Fish, and we never see Premium Rainbowfish like these in any of the live fish stores or in any of the online stores that we visit.
Premium Pet Fish are more energetic, hardier, and have brighter colors with a beautiful metallic sheen.
Click here to learn more about Premium Pet Fish.
Origin: Their ancestors originally lived in Blyth River in northern Australia, but now they live in aquariums throughout most of the world.
The same species is said to live across a large region across northern Australia including Northern Territory and Queensland.
Though they may be the same species; they may not be the same color variety.
Maximum Size: In aquariums, male Blyth River Trifasciata Rainbows can grow to be about 4" long, including their tails.
Females are usually smaller and plumper when mature. Sometimes very old Rainbowfish are even bigger. Sometimes much bigger.
Behaviors: Most Rainbowfish are active swimmers and are rarely aggressive but do quarrel with each other.
Compatibility: Some recommended tank mates include other varieties of Rainbowfish, Clown Loaches, Danios, Barbs, Gouramis, and many other medium size aquarium fish.
Click here to read more about compatible groups of pet fish.
Temperature: These Rainbowfish can live pretty well from about 65 to 80 degrees F., but they're probably most comfortable at about 74 degrees F.
Click here to learn about aquarium temperature, aquarium thermometers, and aquarium heaters.
Feeding: Premium Fish Food Flakes when small and Premium Pellet Food when larger.
Click here to learn more about and shop online for premium fish foods.
Water Conditions: This Rainbowfish seem to be tolerant of a wide range of water conditions.
Probably a pH of about 7.5 with moderate hardness is best.
Most water in the US has a higher pH and is harder but seems to be OK, so it's probably best NOT to adjust the pH or the hardness of the water.
Here in our facilities the water is hard and the pH is usually about 7.8. We ship them in this water.
Click here for a lot more information about aquarium water conditions.
Aquarium Size: It is probably best to house the fish in at least a 30-gallon tank, but bigger is better.
Keep at most one Rainbowfish per 2-gallons, when they're small.
Larger Rainbowfish need about 4-gallons per Rainbowfish. Huge Rainbowfish need even more water per fish.
Decor: Rainbowfish do not need gravel, and a layer of gravel more than 1/4" thick will usually fill with bits of uneaten food that will contaminate the water.
Click here for more about aquarium gravel.
Live Plants are beautiful and improve the water quality.
Aquarium Filter: Bio-Wheel Filters are highly recommended.
A Penguin 200B Filter in an aquarium with 20 to 30-gallons of water is OK, but a Penguin 350B is the right size for a 30 to 60-gallon aquarium.
Click here to learn more about aquarium filters.
The addition of Lava Rocks will keep nitrates in the ideal range.
Click here to learn more about using Lava Rocks in aquariums.
Life Span: Rainbowfish can live for several years with good water and good food.
Gender: It's not easy to tell the males from the females when they are young and sometimes, even as they mature.
Usually males will become bigger and much more colorful. Females are plumper and have less color.
Breeding: Rainbowfish scatter a large number of eggs on plants or special breeding mops made of nylon yarn.
Popularity: Blyth River Trifasciata Rainbowfish are rather new to the aquarium hobby, and since they are very hardy, very energetic, and very colorful, they should become very popular.
If you patiently raise them up, you'll be amazed by their colors.
Names: The scientific name of Trifasciata Rainbows is Melanotaenia trifasciata.
Variations: We do not know of any variations of this fish, but it occurs over a wide region, so there may be some variations.
Of course there are many other types of Rainbowfish with a wide variety of colors and patterns.
Click here for a lot more information about keeping and caring for Rainbowfish, including a picture gallery.
We hope you've enjoyed reading our comments here.
We have 380-aquariums with lots-and-lots of popular aquarium fish plus lots-and-lots of rare fish!
We consider ourselves to be the link between the world's best sources of fish and the world best customers. We love our work, and we are very responsible.
All of our fish are Premium Quality Fish from the best suppliers in the world. Our fish have better health, more energy and brighter colors, as you can see in our pictures on this website.
We also offer lots and lots of information about keeping pet fish, all from the knowledge of the Bailey Brothers, who have a combined total of 100+ years of experience as breeders, wholesalers, and retailers of pet fish!
Our fish and our customers are treated with the best of care, and we work energetically everyday to make sure every customer enjoys their new fishy friends.
When you purchase pet fish from us, you know you're receiving premium quality fish and premium quality service.
"Received my fish last night and was so pleased! They all arrived alive and appeared to be healthy.
"Once in the tank, they became very active and are now thriving in their new home.
"Beautiful fish, I asked for color and aquariumfish delivered. Processing and shipping was extremely quick."
Nevin and DrTom, the Bailey Brothers
This website is owned and operated by the Bailey Brothers, DrTom and Nevin, who've been together in the fish business for more than 50-years.
The Product Manager has been with the company for more than 35-years.
So we feel very confident that this is the fishiest crew anywhere.