Anyone interested in keeping these fish will likely have to seek out specialist breeders since you’re probably not going to stumble across an eggfish when visiting your local pet store.
We’ve got the lowdown on these elusive fish, so read on if you want to know more.
- How Long Do Eggfish Live?
- History, Origins and Development
- Easy or Hard to Keep in a Home Aquarium?
- Special Care Considerations
- Aquarium Set-up
- Tank Mate Compatibility
- Video: A Close Look at the Bubble Eye Goldfish
- Final Thoughts
Eggfish are so called because of their compact egg-shaped bodies. They lack dorsal fins, which further contributes to their egg-like appearance.
This also means they have smooth arched backs, uninterrupted by the dorsal fin, the highest point being right in the center of the backbone A traditional eggfish has a short double tail, whereas a phoenix eggfish has long flowing fins.
What Colors and Variations Do Eggfish Goldfish Come In?
The eggfish can be found in a wide range of colors and all scale types – matte, nacreous, and metallic.
One of the rarest and most sought-after variations of the eggfish is the blue phoenix eggfish – or blue egg phoenix, as it’s sometimes called.
As mentioned above, Phoenix eggfish have long flowing tails and, as the name suggests, blue phoenix eggfish are blue in color.
How Big Do Eggfish Get?
On average, eggfish reach about 5 to 6 inches in length, but they may occasionally grow up to an inch or so larger.
How Long Do Eggfish Live?
The average lifespan of an eggfish is around 15 years if properly cared for.
Of course, many goldfish live significantly shorter lives than this, but it’s usually due to improper care. So, as long as you look after them properly, your eggfish may be with you for well over a decade.
History, Origins and Development
The eggfish was originally developed in China, which is where all goldfish can be traced back to.
There’s not a large amount of information on the specific origins of the eggfish, but — according to the Goldfish Society of America — they were among the earlier types of goldfish developed.
While their origins are likely to date back well over 800 years, the first recorded mention of them wasn’t until 1726 in the book ‘The Chapter of Fowls and Insects, Collection and Contemporary Books with Illustrations’ by Jiang Ting Xi.
Today, eggfish are so rare that the Goldfish Pagoda in Hong Kong has dedicated resources to breeding blue phoenix eggfish, and even sent 18 specimens to the United States in the mid-90s, to help with the repopulation efforts.
However, since they’re slow spawners, breeding the eggfish isn’t the most straightforward process.
Easy or Hard to Keep in a Home Aquarium?
Eggfish should be no easier or harder to keep in a home aquarium than an average fancy goldfish.
Special Care Considerations
Beyond the regular care requirements of any goldfish, eggfish don’t have any particular care considerations.
Eggfish — like all goldfish — are omnivores and thrive on a varied diet. While your eggfish’s diet should include a high-quality commercial flake or pellet food specially designed for goldfish, this shouldn’t be the only thing they eat.
You should also feed them a range of plant-based and animal-based foods, including brine shrimp, shelled peas, zucchini, blueberries, mosquito larvae, and bloodworms.
These may be fresh, frozen, or freeze-dried.
It should go without saying, but ensure any foods are cut to an appropriate size for your fish. These supplementary foods don’t need to be fed with every meal, but giving them to your fish at least a few times a week will improve their health and nutrition.
Goldfish don’t have stomachs, so they do better eating little and often. Instead of feeding your eggfish one large meal a day, try to offer two or three smaller meals.
Your eggfish needs a proper aquarium set-up to stay happy and healthy.
Tank Size and Shape
Although eggfish aren’t huge, they need surprisingly large tanks. Like all goldfish, they produce a lot of waste, and the larger the tank, the less of an issue this will be.
It’s also worth considering that your fish’s aquarium is essentially their whole world, so it’s kinder to provide them with as large a tank as you can.
The minimum aquarium size you should aim for is 30 gallons for one eggfish, plus an additional 10 gallons for every other fish. So, if you were to keep five fish, for example, you’d need a 70-gallon tank.
Rectangular/cuboid tanks that are wider than they are tall are ideal for your eggfish. This gives the water inside a larger surface area, which increases the oxygen content.
Like any goldfish, an eggfish absolutely needs a filter in their aquarium. Some newbies to the fish keeping world assume goldfish are fine without filtration, but this couldn’t be further from the truth.
As we mentioned above, goldfish produce a lot of waste, and so they need a high-quality filter for their aquarium. Otherwise, you’d need to change the H2O in their tank daily to keep reasonable water quality.
Choose whatever type of filter you prefer (we recommend canister filters mostly), but make sure it’s adequate for the size of your tank.
Substrate isn’t a must-have for an eggfish, but goldfish do like to forage for food in their tank’s substrate so that it can give them some extra enrichment in their life. Besides, some aquarists just prefer the look of substrate.
If you do choose to use a substrate, choose either fine sand or large gravel or rocks that are too large for your eggfish to swallow. Some goldfish have a tendency to eat smaller gravel, and it can get stuck in the digestive tract, causing major issues.
Your eggfish’s tank doesn’t necessarily need lighting if it’s in a room with plenty of natural light (though it’s worth noting here you should never keep an aquarium in direct sunlight).
That said, most people do light their goldfish’s tanks, as they generally look more attractive that way.
If you light your goldfish’s tank, be sure to follow a natural day/night pattern of about 12 to 16 hours of light, followed by about 8 to 12 hours of light, and so on. You may want to set your lights to a timer to keep the cycle regular.
The ideal water temperature for an eggfish is between 65 and 72 degrees Fahrenheit.
Tank Mate Compatibility
Since eggfish are so rare, there’s not a lot of information available regarding the best tank mates for these goldfish. To be on the safe side, we’d ideally recommend housing them with other eggfish only.
They should be relatively strong swimmers, despite their absent dorsal fin, so they could be fine in a tank with other fancy goldfish, but you’d have to keep a close eye on them to ensure they’re getting enough food.
Video: A Close Look at the Bubble Eye Goldfish
The following video shows a pair of blue phoenix eggfish in action.
While eggfish aren’t easy to get hold of, they can make an excellent aquarium fish.
If you’re interested in keeping eggfish, do your research and look for a reputable breeder who’s doing their bit to further this declining goldfish variety.
Happy fish keeping!