The Pearl Danio, scientifically known as Danio albolineatus, is a small, freshwater fish belonging to the Cyprinidae family, which also includes other popular aquarium fish like Zebra Danios and Rasboras. This peaceful and active species is native to the streams and rivers of Thailand, Myanmar, and Indonesia.
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Pearl Danios are not considered rare and are readily available in the aquarium trade. They sport an attractive, iridescent silver-blue body with a pinkish hue and a striking horizontal gold stripe running from their nose to their tail. Some color variations, such as the “Neon” and “Purple” morphs, have been developed through selective breeding.
As a mid-dwelling species, Pearl Danios prefer the middle and upper levels of the water column. They thrive in well-planted tanks with plenty of open swimming space and a gentle current that mimics their natural habitat. These omnivorous fish readily accept a variety of foods, including high-quality flakes, small pellets, and frozen or live foods like brine shrimp and daphnia.
Pearl Danios are active, social fish that do best in groups of at least six individuals. They are known for their peaceful temperament and make excellent companions for other non-aggressive species of similar size, such as Tetras, Rasboras, and Corydoras catfish.
On average, Pearl Danios grow to about 2.5 inches (6.4 cm) in length and have a lifespan of 3-5 years with proper care. They prefer water temperatures between 68-77°F (20-25°C), a pH range of 6.5-7.5, and soft to moderately hard water.
One fascinating fact about Pearl Danios is their ability to produce sounds through a process called “stridulation,” which involves rubbing their pectoral fins against their body. This unique behavior is thought to play a role in communication and courtship.
Pearl Danios have been popular in the aquarium hobby since the early 1900s, when they were first imported to Europe. Today, they remain a favorite among both novice and experienced aquarists due to their beauty, hardiness, and engaging personality.
Key Information
Pearl Danios (Danio albolineatus) are a popular freshwater fish species known for their stunning appearance and peaceful temperament. While the standard Pearl Danio sports a silver-blue body with a striking gold stripe, several attractive variants have been developed through selective breeding. These include the “Neon” morph, which displays a more intense blue coloration, and the “Purple” morph, which showcases a beautiful purple hue along its body.
| Family | Cyprinidae |
| Price | $2 – $5 per fish |
| Common Names | Pearl Danio, Pearly Danio, Neon Pearl Danio |
| Variants | Neon, Purple |
| Ideal Tank Size | 20 gallons or larger |
| Water Parameters | Temperature: 68-77°F (20-25°C), pH: 6.5-7.5, Hardness: Soft to moderately hard |
| Lifespan | 3-5 years |
| Full Size | 2.5 inches (6.4 cm) |
| Natural Environment | Streams and rivers of Thailand, Myanmar, and Indonesia |
| Behavior | Peaceful, active, and social |
| Habitat Preference | Mid-dwelling, well-planted tanks with open swimming space |
| Aquarium Decoration | Live plants, driftwood, rocks, and a gentle current |
| Ideal Tank Mates | Other peaceful, similarly-sized fish (e.g., Tetras, Rasboras, and Corydoras) |
| Fish to Avoid | Large, aggressive, or predatory fish |
| Best Foods/Diet | High-quality flakes, small pellets, frozen or live foods (e.g., brine shrimp and daphnia) |
| Disease | Generally hardy, but susceptible to common freshwater diseases if water quality is poor |
| Sex-Switch | Does not change sex |
| Gender Differences | Females are slightly larger and more rounded than males |
| Care Level | Easy |
| Breeding Level | Moderate |
Ideal Tank Mates
When selecting tank mates for Pearl Danios (Danio albolineatus), it’s essential to choose species that share similar water parameters, temperament, and size. Pearl Danios are peaceful, active, and social fish that thrive in the company of their own kind and other compatible species.
Ideal tank mates for Pearl Danios should be non-aggressive, similarly sized, and adapted to the same water conditions. They should also occupy different levels of the aquarium to minimize competition for space and resources. By carefully choosing compatible tank mates, you can create a harmonious and visually appealing community aquarium.
Here are 15 ideal tank mates for Pearl Danios, along with explanations of why they are compatible:
1. Neon Tetras (Paracheirodon innesi)
Neon Tetras are small, peaceful, and colorful fish that occupy the middle and lower levels of the aquarium. They share similar water preferences with Pearl Danios and add a vibrant splash of color to the tank.
2. Harlequin Rasboras (Trigonostigma heteromorpha)
Harlequin Rasboras are another peaceful schooling fish that coexist well with Pearl Danios. They have a similar size and temperament, and their striking coloration complements the Pearl Danios’ appearance.
3. Cherry Barbs (Puntius titteya)
Cherry Barbs are small, active, and peaceful fish that share similar water preferences with Pearl Danios. They add a pop of red color to the aquarium and are known for their playful behavior.
4. Zebra Danios (Danio rerio)
As close relatives of Pearl Danios, Zebra Danios make excellent tank mates. They share similar water parameters, size, and active swimming habits, creating a dynamic and engaging aquarium display.
5. Guppies (Poecilia reticulata)
Guppies are colorful, peaceful livebearers that occupy the top and middle levels of the aquarium. They are adaptable to a wide range of water conditions and add a vibrant touch to the tank.
6. White Cloud Mountain Minnows (Tanichthys albonubes)
White Cloud Mountain Minnows are hardy, peaceful fish that thrive in similar water conditions as Pearl Danios. They are active swimmers and add a silvery shimmer to the aquarium.
7. Corydoras Catfish (Corydoras spp.)
Corydoras Catfish are peaceful bottom-dwellers that help keep the substrate clean. They are compatible with Pearl Danios and add diversity to the aquarium’s bottom level.
8. Kuhli Loaches (Pangio kuhlii)
Kuhli Loaches are peaceful, eel-like fish that occupy the bottom of the aquarium. They are nocturnal and have a unique appearance, making them an interesting addition to a Pearl Danio tank.
9. Dwarf Gouramis (Trichogaster lalius)
Dwarf Gouramis are peaceful, colorful fish that occupy the top and middle levels of the aquarium. They have a calm temperament and can coexist harmoniously with Pearl Danios.
10. Otocinclus Catfish (Otocinclus spp.)
Otocinclus Catfish are small, peaceful algae-eaters that help maintain a clean aquarium. They are compatible with Pearl Danios and contribute to the overall health of the tank.
11. Ember Tetras (Hyphessobrycon amandae)
Ember Tetras are tiny, peaceful fish with a striking red coloration. They occupy the middle and lower levels of the aquarium and make an attractive addition to a Pearl Danio community.
12. Cardinal Tetras (Paracheirodon axelrodi)
Cardinal Tetras are stunning, peaceful fish with a vibrant red and blue coloration. They share similar water preferences with Pearl Danios and create a visually appealing display.
13. Rummy Nose Tetras (Hemigrammus bleheri)
Rummy Nose Tetras are peaceful schooling fish with a distinctive red head and silvery body. They are active swimmers and make excellent companions for Pearl Danios.
14. Pygmy Corydoras (Corydoras pygmaeus)
Pygmy Corydoras are miniature bottom-dwellers that are peaceful and compatible with Pearl Danios. They help keep the substrate clean and add interest to the lower levels of the aquarium.
15. Endler’s Livebearers (Poecilia wingei)
Endler’s Livebearers are small, colorful fish that occupy the top and middle levels of the aquarium. They are peaceful, hardy, and adaptable, making them suitable tank mates for Pearl Danios.
FAQs
How many Pearl Danios should be kept together?
Pearl Danios are schooling fish and should be kept in groups of at least six individuals. Keeping them in larger groups will help them feel more secure and display their natural behaviors, such as shoaling and social interactions.
Can Pearl Danios be kept with shrimp or snails?
Yes, Pearl Danios can be kept with peaceful invertebrates like Cherry Shrimp, Amano Shrimp, and Nerite Snails. These invertebrates can help keep the aquarium clean and add interesting variety to the tank.
How often should I feed my Pearl Danios?
Feed your Pearl Danios small amounts of food 2-3 times a day. Offer only what they can consume within 2-3 minutes to avoid overfeeding and maintain good water quality.
Do Pearl Danios require a heater?
Pearl Danios are tropical fish and require a stable water temperature between 68-77°F (20-25°C). Unless your room temperature consistently falls within this range, it’s essential to use an aquarium heater to maintain a suitable environment for your fish.
How often should I perform water changes?
Perform weekly water changes of about 10-20% of the tank volume to maintain good water quality. Use a gravel vacuum to remove debris and waste from the substrate during water changes.
Can Pearl Danios jump out of the aquarium?
Yes, Pearl Danios are known to be active swimmers and may jump out of the aquarium if given the opportunity. To prevent this, ensure your tank has a tight-fitting lid or cover.
Are Pearl Danios suitable for planted aquariums?
Pearl Danios are an excellent choice for planted aquariums, as they do not typically disturb or uproot plants. The presence of live plants can also help maintain good water quality and provide natural hiding spots for your fish.
How can I tell if my Pearl Danios are healthy?
Healthy Pearl Danios should have a vibrant appearance, clear eyes, and no visible signs of disease or injury. They should be active, swimming freely, and displaying normal behavior. Any changes in appearance, behavior, or appetite may indicate a health issue and should be addressed promptly.
