GloFish® Cosmic Blue Danio

General Information
Scientific Name Danio rerio
Minimum Water Size 10+ gallons (37.85+ liters)
Ease Of Care Beginner
Average Lifespan 4 years
Temperament Peaceful
Approximate Adult Size 3 inches (7.62 centimeters)
Water Parameters 64-75 degrees Fahrenheit (17.78-23.89 degrees Celsius), 8-12 KH, 8-25 dH, 6.5-7.0 pH
Diet Omnivore
Native Region India

Overview

Genetically altered from one of the most common types of freshwater fish, the zebra danio, GloFish® were originally created in order to aid in testing various waters and in genetic research. Scientists combined the naturally occurring fluorescence that is found within anemones with the hardy zebra danio, and wanted to know if various water sources had become polluted. If the water was polluted in any manner, the GloFish would suddenly lighten up to alert those that there was a chemical or toxin present that was harmful, otherwise the zebra danio would stay the color is was changed into without any glow. After scientists had created the early stages of these helpful fish, the public had grown a strong interest and wanted to have these amazing fish inside of their own aquariums. Although these fish are sold in most stores either in person or online, the research that had brought them into existence still continues in the current day with some percentage of sales from these fish being sent to help them understand how these fish can protect the environment and develop new disease fighting drugs.

The zebra danio is one of the most popular freshwater fish when it comes to communities tanks that are new or old alike. These fish make excellent starting fish as they are able to withhold a large range of different parameters with ease, and are most commonly used for a fish-in cycle if the owner plans on keeping the fish afterward. They are also very commonly used as dither fish to in order to bring out more shy fish as these will be constantly swimming around the middle to top of the tank at all hours of the day. These fish get their name from their blue and white/gold strips that resemble a zebra, and the fact that they like to be in schools of their own similar kind. Sadly, if there isn't enough of their own kind they will start to fin nip many of the slower moving fish and can become more aggressive if their numbers are too low.

Zebra danios have known to be jumpers and if given the chance will jump outside of their aquarium if there is no lid or hood to prevent them from doing so. In order to prevent this even further, many have added extra water circulation in order to tire out the fish or prevent them from getting enough speed to jump outside of the water.

Breeding

Zebra danios are extremely easy to breed, and make a very good choice at learning how to take care and bred egg laying fish. Male zebra danios are more torpedo in like their shape, while females will have a larger belly in order to hold their eggs. In a majority of cases, the male will span with a female and stay loyal to only the female if she remains inside of the tank with the male. The first step in order to have them bred is to make another tank that is shallow, and place a male and female inside of the new tank. Many use pebbles, big rocks, grates, or other similar objects to allow for the eggs to drop below without the zebra danio being able to eat them afterwards. Leave the lights dimmed since it will recreate their natural breeding time of the early morning or late evening. Approximately 300-400 eggs will be produced and will hatch in approximately 48 hours after the male and female have bred.

Remove the pair once the eggs have been laid as they will not provide any parental care and tend to eat the eggs if they are not hidden enough.

Feeding

Since the goal is to keep them as healthy, and as happy as possible, it’s always recommended that you try to imitate the diet they would naturally follow in the wild. This diet would include small insects, worms, algae and crustaceans. Since many will not have access to get these foods, a food that is mostly based on a meaty substance like more pellets are will work. As they are omnivores giving them food that is based on plant matter will also make sure that they thrive, which most flake foods are based off of. Live foods should be used when available, otherwise using frozen foods is also a very good option as it gives them their true natural food in a very convenient way.