Zebra Danio Stats InfographicThe Zebra danio, also known as Zebrafish, are popular freshwater fish that demand little care from you. The Zebra Danio has stripes just like the Zebra, hence its name.

These white and black stripes make it easy for aquarists and fish lovers to tell this fish apart from other fish species. Add their beauty to the fact that Zebrafish are extraordinarily hardy and easy to breed, and maybe you can just begin to understand why they tickle the fancy of many aquarists.

Thanks to our research, and personal experience raising this fish, we have put together a comprehensive care guide.

Follow our tips to raise a healthy, happy community of Zebra Danios. Without much ado, let’s get started.

Zebra Danio Stats

Family Cyprinidae
Origin Eastern India
Care Level Beginner
Temperament Peaceful schooling fish
Minimum Tank Size  10 gallons
Breeding Egg layer
Diet Omnivore
pH Range 6.5 to 7.0
Hardness 5 to 12 dGH
Temperature 64 to 74 F
Average Size 2 inches
Lifespan 3.5 to 5.5 years

Overview of the species

Initially, aquarists believed that Zebra Danios originated from East and West Pakistan; however, recent studies show that Zebrafish are endemic to the eastern parts of India. Zebra Danios dwell in a wide variety of habitats in the wild, from the fast-moving streams to slow-moving waters and even still ponds.

In recent times, most of the fish available in pet stores are captive-bred Zebrafish. This is supported by the fish’s ease of breeding in captivity. Zebra Danios are peaceful, hardy fish species that you can purchase at most local pet shops.

Also, Zebrafish are popular test subjects for much scientific research; they are used frequently as model vertebrate species. A fun fact of Zebrafish is that they share 70 percent of human genes! Yes, we bet you didn’t know that.

Identifying a Zebra Danios

Zebra danio also known as zebrafishAs their name implies, Zebra Danios have distinct horizontal black and white stripes like those of the Zebra. In some, you may see blue and purple horizontal lines that go all the way from the fish’s gill to its tail. Whatever the color of the stripes is, they highlight the Zebra Danio’s slim compressed body beautifully.

There are different variants of Zebrafish available in pet stores today, ranging from albino to veil-tailed, golden, long-finned, and the more popular leopard variants. In the wild, albino Zebrafish are often easy prey for predators. All of these Zebra Danios variants add diversity and life to your fish tank.

– Size

The striped danio measures about 2 inches in length when fully grown. However, a few aquarists have reported that they can grow longer than this if they are kept in large ponds rather than indoor aquariums. The quality of care you give to them also influences their growth and development.

– Sexual Dimorphism

Zebra danios display sexual dimorphism, with the males being slimmer than the female zebra danio. At the breeding season, the female becomes plumper, with their abdomen becoming fuller. Male Zebra danios have a more golden appearance than their female counterparts, who have a silvery-white appearance.

– Average Lifespan

On average, zebrafish lifespan is between 2.5 to 5.5 years. However, you must understand that their lifespan is to a large extent dependent on their environment and other factors under your control. When you create a favorable habitat for this fish species, they will thrive and grace your aquarium for a long time.

Fish Behavior

Zebra danioZebra Danio are social and peaceful fish; thus, we advise that you raise them in groups. They exhibit shoaling behavior and display a hierarchical system of dominance via playful, non-aggressive interactions. Although Zebra fishes are generally peaceful, they may nip at the fins of slow-moving fish species with long fins.

In large shoals, Zebrafish become hyperactive, occupying all the levels of the fish tank, most especially the middle and top layers. However, if their numbers are low, they may become aggressive towards other tank mates and become lethargic in extreme cases.

– Can I Raise Only One Zebra Fish?

No, because Zebrafish are schooling fish and do not do well on their own. Alone, the fish becomes visibly stressed, less active, shy, and more prone to freshwater diseases. We recommend that you raise them in groups of at least five. If you decide to heed our advice and raise them in groups, you should also know you will need a bigger tank. The more the numbers, the bigger the tank size.

Zebra Danio Care

Zebra Danio is easy to care for, which is why we recommend them for beginners. The rule of thumb in caring for this fish species is replicating the conditions in their wild habitat. Granted, you may not be able to do this perfectly, but pay attention to the critical elements like their tank set up, diet, breeding, and suitable tank mates.

This section discusses what caring for Zebra Danios entails and essential factors for you to bear in mind.

– Setting Up The Tank

When setting up a tank for Zebra Danios, you must replicate the conditions in its natural habitat. Thankfully, that is not as hard to replicate.

We have listed vital areas that you need to pay attention to in your tank setup.

. Tank Size

If you get your fish tank size right, you have effectively tackled 50 percent of the tank setup. The minimum tank size for your Zebra Danios should be 10 gallons for one fish.

You will need a bigger tank; we recommend an extra 2 gallons for each additional fish you add to the tank. Remember that the larger the tank is, the more space your fish has to swim around and the happier it is.

2. Substrate

Your choice of substrate is significant, as it must enable the Zebra danio’s process. We recommend sand because it is soft and doesn’t hurt the fish’s abdomen. Sand also allows the Zebrafish color to stand out beautifully in the aquarium. Before introducing the substrate to your tank, you need to wash it thoroughly to avoid contaminating your tank.

3. Water Parameters

Once the substrate has been added to the tank, the next step is adding water slowly to your tank. The water should have a temperature range within 64 to 74 F, hardness around 5 to 12 dGH, and pH between 6.5 and 7.0.

4. Tank Decoration

Once the water is in place, you can now face the next step: aquatic landscaping (aquascaping). Freshwater plants such as Amazon Swords plants and Java Fern help maintain the dissolved oxygen concentration of your water. They also provide excellent hiding spots for your fish and give your fish tank a natural look. You can also add bogwoods, rocks, and large round pebbles to further replicate this fish’s natural habitat.

5. Filtration

The need for a sound filtration system in your water tank cannot be over-emphasized. It will to a large extent, take care of the water quality in your tank. The exact kind of filter you should buy differs; however, you should select one that meets your tank’s needs.

6. Do I Need a Closed Tank?

Yes, you do. Zebra Danio are expert jumpers; thus, we advise that you get a closed tank and always keep it covered. That is, of course, if you do not want to come home to a school of dead Zebrafish on the floor.

Tank Mates

A lot of beginner aquarists are at a loss to zebrafish compatibility. The truth is that thanks to Zebra’s peaceful nature, you have a lot of options for tank mates. You can keep them with small tetras like the Emeralds, Rummy Nose, and Neon Cardinals. Gourami, Gold Barbs, and Cherry are great also.

Other possible tank mates for Zebrafish are small freshwater invertebrates like Cherry shrimp and Ghosts, aquatic amphibians like the African Dwarf frog, etc. Nitrites, Assassin snails, Loaches, Cory cats, Upside down catfish, and other Danios make good tank mates for the Zebra Danios.

– Tank Mates to Avoid

Do not keep Zebra Danios with slow-moving or long-finned fish species like Sailfin Mollies, Fancy Goldfish, Bettas, Fancy Guppies, etc. You also should not keep them with large, aggressive fish like Red-tailed sharks and Tiger Barbs. Take note of this, and you are on your way to having a happy tank of these stripped Danios.

Proper Diet

One question we get asked by a lot of aquarists, both beginners and experienced ones, is “what do Zebrafish eat, and how often should they be fed?”

To answer that question, longfin Zebra Danio is an omnivore and can eat plant and animal-based food. In answer to the second question, Zebrafish should be fed small portions of food, as many as five times a day.

Since Zebra Danios are omnivores, they are not fussy eaters; in fact, they will eat anything you give to them. We recommend that you try as much as possible to replicate their diet in the wild; that means that you should feed the Zebra Danios loads of tiny insects, crustaceans, worms, and algae. Balance the animal-based foods off with plant-based foods such as zooplanktons.

Frozen and high-quality commercial foods are also great substitutes for live food. Try out the following:

  • Frozen blood worms
  • Black worms
  • Brine shrimp
  • Wingless fruit flies
  • Daphnia
  • Mosquito larvae
  • Great plant-based food for Zebra Danios include:
  • Blanched spinach
  • Zucchini
  • Cucumber
  • Zooplanktons, etc.


Zebra Danio is perfect for beginners because they are so easy to breed. However, just like other fish species, you must follow specific steps and conditions to reproduce Zebrafish but don’t worry successfully; they are not hard to follow.

– How to Condition This Fish for Breeding

Breeding in Zebra Danio is often induced by a change in temperature in the wild. Thus, mimicking the breeding patterns in the wild is paramount to a successful breeding cycle in captivity.

Start the breeding process by separating the male and female pair from the main tank and putting them in the breeding tank. For every female fish, you should add two males to the tank. The breeding tank should have at least a 10-gallon capacity and temperatures between 71-80°F.

– What to Feed

Diet plays a vital role in the conditioning process of Zebra Danio. So you will need to feed the intended breeding pair high-quality live food like bloodworms and daphnia. The food helps to fatten the female Zebrafish up and encourages it to start producing eggs.

After two weeks, you should notice the female’s abdomen beginning to get rounder, indicating the development of eggs. Once this happens, spawning is set to take place within the next 24 hours.

– Spawning

The females lay the fertile translucent eggs at the base of the breeding tanks; it is essential to remove the infertile eggs, to prevent contamination. Since adult Zebras are notorious for eating their eggs, you must remove them from the tank after spawning to protect the eggs. It takes about three days for the fertile eggs to hatch into fry.

– Caring for Zebra Danio Fry

Once the eggs have hatched, it is essential to care for the fry. Significant ways to care for the fry include feeding and maintaining a favorable tank environment.

a) Feeding the Fry

Zebra Danio fry should be fed with special high-quality food to nourish them and promote egg-laying. Their diet should be liquid or powdered food that they can easily consume, like powdered egg, commercial fry food, and other finely crushed dry food.

b) How Do I Keep The Fry Tank Clean?

An easy way to keep the tank clean is to introduce some snails to the breeding tank. These snails snack on the uneaten food and keep the tank clean.

You can also add a bio sponge filter to maintain the water quality. Don’t forget to change 10 to 25 percent of the tank water daily. Use a water test kit to ensure that the tank water’s temperature, pH, and hardness are within range.

Common Diseases

Striped Danios are considered to be hardy fish capable of withstanding a variety of environmental conditions. However, without proper care, they can quickly come down with common freshwater diseases such as Ich.

Let’s look at some common Zebra Danio diseases, their causes, symptoms, and treatment.

1. Mycobacteriosis

Mycobacteriosis is a chronic bacterial disease common to laboratory colonies of stripped Danio. The condition spreads to humans through open cuts on the skin.

– Causes

The primary cause of mycobacteriosis is poor animal husbandry practices. With proper tank hygiene, you can prevent the spread of this disease.

– Symptoms

Common symptoms of mycobacteriosis include:

  • Lethargy
  • Anorexia
  • Inflammation and ulceration of fish fins and skin
  • Fish Dropsy
  • Impaired muscular and skeletal development.

– Treatment

Sadly, there is no treatment for this zoonotic disease as even antimicrobial medicines do not tackle the bacteria. To curtail the spread of mycobacteriosis, we suggest that you remove the affected fish from the tank immediately and change the tank water.

2. Intestinal Nematode

The intestinal nematode is another disease that plagues Zebra danios. As the name suggests, the condition is caused by a nematode.

– Causes

Nematodes like Pseudocapillaria tomentosa.

– Symptoms

  • Weight loss
  • Strange swimming pattern
  • Darkened skin coloration
  • Lethargy

– Treatment

Isolate the infected fish to prevent the spread of the disease. Change the water in the tank and thoroughly disinfect the aquarium.

How to Prevent Disease in Your Fish Tank

You can avoid most of the diseases common to freshwater fish by maintaining the right tank conditions.

The first step is choosing a tank of the right size because your fish needs adequate room to swim in. Tight spaces stress Zebra danio out and stress, in turn, leaves them more susceptible to diseases.

Next, quarantine new fish and equipment before adding them to your already established aquarium. Quarantining fresh fish and equipment gives you time to treat and disinfect them thoroughly.

Another tip to help keep diseases at bay is to maintain pristine water conditions. Change your water regularly and ensure that you have a functioning tank filter. Remember that a low concentration of dissolved oxygen in your fish tank is detrimental to fish health.

Finally, avoid overfeeding your Zebra danios; it stresses them out. One way to prevent overfeeding Zebrafish is to work with their stomach size, which is, on average, the size of their eye; yes, it is that tiny. So feed them small portions of food that they can finish in under 3 minutes, several times a day.


  • Zebra danio fishZebra Danio or Zebrafish are freshwater fish species endemic to Central Asia
  • They measure only 2 inches (5 cm) in length and can live for 5.5 years with proper care
  • Zebrafish are peaceful, schooling fish, and thrive in groups of at least five other zebras

While Zebrafish may be common, they are anything but boring! Their different colors imbue your aquarium with a vibrant burst of colors that even the blind envy.

We hope you enjoyed reading this comprehensive care guide and would love to answer any questions you may have. You can join our community of fish lovers or simply leave us a comment below.

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