Danio Rherio - beautiful and unpretentious fish, which are ideal for beginners aquarists. They breed well in captivity, so at home it is not difficult to breed them. Rerio live in packs, in which there are at least five individuals. They perfectly coexist with other peace-loving fish, which is why they are so often found in home aquariums.
Fish Danio Rherio belongs to the carp family. In nature, they live in rivers and streams with a large flow, so the flock in the aquarium will always be in close proximity to the air-generating filter.
They have an elongated flattened body, not exceeding 5 cm. In parallel, there are parallel strips with different colors along the sides. Depending on the time of year, adult danios can change their color in the aquarium and become brighter.
The homeland of all the beloved Danio Roreo is Asia. They can be found in large quantities in natural waters, stretching from Pakistan to India. As well as small populations of fish can be found in the rivers of Bhutan, Bangladesh and Nepal.
Rerio was first described by Hamilton, who in 1822 visited Asian countries and met this amazing representative of the local fauna.
To date, scientists have classified by color a large number of subspecies of Danio. Rherio including transgenic fish (artificially bred) may have a variety of colors:
- Danio Rerio pink,
- Green Danio Rherio,
- yellow danio rorio
And today there are artificially derived species of Rerio, which have very bright fluorescent stains. Among the modified fish stand out: blue, orange, pink, etc. As for the green glowing Danio, this color looks unnatural, so many aquarists do not recognize it. Despite the fact that these danios are genetically modified, no negative effects of human intervention in nature have been noticed so far. That is why they continue to enjoy great popularity among both beginners and experienced aquarists.
Care and maintenance
Aquarium fish Danio Rherio is very unpretentious, so it is easy to contain. In captivity, they are able to live in flocks, so there should be more than five members of this species in home aquariums. Life expectancy in good conditions is at least three years (maximum five).
Fish Danio Rerio should be settled in an aquarium, the length of which significantly exceeds its height, as it loves to chase its own kind. If a pack of 10–20 individuals is acquired, then for a normal life it will be sufficient for them to have a capacity of 30–70 liters. In the event that the population begins to actively grow, owners will have to change the aquarium to a more spacious one. At its arrangement it is necessary to use floating plants or planted in a ground, then they can always hide from annoying relatives.
Rerio is recommended to be kept at a temperature of 18-23 degrees, weekly should be updated to 30% water. Due to the fact that such fish often jump out of aquariums, many owners cover them with lids. But at the same time they should leave a small gap through which air will flow.
Rherio prefer to swallow food from the surface of the water. But, if the pellets begin to sink, they will gladly fumble at the bottom of the aquarium. Many people prefer to use dry food, but we strongly recommend diluting the diet of fish with live food:
- small moth,
- ice cream pipe maker.
Dry daphnia should be pre-rubbed with your fingers, thus forming tiny fragments that Rerio can swallow without any problems.
Compatible with other fish
Thanks to the peace-loving character, Danio Rério can be kept with various types of aquarium fish that do not show aggressiveness:
They should not be housed with Barbus Denison and others like him (astronotus, Koi carp, goldfish, discus, cichlid), as this predator will permanently injure their fins and tails. It is recommended to keep Rerio flocks, from 10 to 15 pieces (at least 5 individuals). In this case, the hierarchy will be maintained between the fish, and the whole family will be able to more easily endure stressful situations. Despite the fact that Danio constantly chasing each other, they do not show aggressiveness with such behavior, it’s just their natural way of life in a pack.
Breeding and breeding
Even newbies can breed Danio at home. First of all, it is necessary to learn to distinguish female from male. If you look closely at the calf of a fish, you can see that the males have more miniature sizes, whereas the female's abdomen is rather large and noticeable, especially when they are filled with caviar.
To determine whether the feminine danios are ready to spawn, you need to look at the abdomen of the female, which Rerio should be equally wide both in the rear and in the front of the body.
For spawning grounds it is recommended to use an aquarium with a volume of up to 10 liters, which is installed in a well-lit place. Bottom should be covered with plants, pressing them with pebbles. Then water is poured into the tank for two days, which should cover about 6 cm of green. In the evening, a fish is launched into the aquarium, which adapts to new conditions overnight, and in the morning it will begin to spawn.
Caviar Danio is fertilized by male milt when it leaves the body of the female. One female can sweep up to 450 eggs. The maturation process lasts for 2–5 days, depending on the conditions created. Eggs that hang under the water for several days can become food for their parents, therefore, after spawning is completed, the males and females need to be transplanted. In a week Dani Rerio fry are ready for independent swimming.
The most common diseases of Danio Rherio include:
- Tuberculosis. The infection is carried along with the soil, plants and sick fish. Suspected illness can be on the grounds: lethargy, lack of appetite, loss of scales. Amenable to treatment with Kanimitsin only at an early stage.
- Alkalosis. The disease occurs when the content of fish in an aquarium with an unbalanced acid-base balance of water. Rerio begins to behave restlessly, jumping out of the water. The color may turn pale, the fish begins to rub against the walls or pebbles.
- Tweezers The reason is the poor water quality.
- Obesity. Such a problem arises due to overfeeding.
- Anger on the body. It is necessary to transplant the sick fish in a separate aquarium, where the water temperature is maintained at 28 degrees. To eliminate growths it is recommended to make salt baths.
- Trichondiasis. It provokes the development of the infectious disease ciliates-trichodina. The fish begins to rub against the walls of the aquarium, a dirty raid appears on the body, the color changes, it becomes more pale.
The main advantage of Rerio is its ability to live in any conditions. They feel great in aquariums that do not have water heating systems, as they are able to survive at a temperature setting that drops to 18 degrees. But, despite the simplicity, people should not keep Danio Rerio in extreme conditions, as the fish can get sick and die.
Danio - fun crowd in the aquarium
Occasionally next to it may be an inscription, made, judging by the texture, with the last movements of the exhausted fins "No pasaran!". If the owner turns out to be quicker and the fugitive will be set in her native element in time, she, still clinging with dust, joyfully rushes to her friends and, probably, choking with delight, squeals: “That was fun! there is a lot of things! " And they probably respond to her: "Well, you - the plague! But you really have a great bug!", And the whole flock cries out a circle around the aquarium.
Danio rerio description
Rerio danios belong to a widespread genus of ray-finned fish of the carp family. Under natural conditions, their main habitat is different kinds of water bodies with standing or slowly flowing water. Homeland danio rerio Southeast Asia. These fish are the first genetically modified home species.. In 2003, fluorescent zebrafish known under the trademark GloFish first appeared.
In nature, zebrafish usually prefer to swim among aquatic vegetation. There it feeds on small invertebrates and spawns. It is possible to distinguish these unpretentious aquarium fish by a peculiar striped color and narrow body, the length of which does not exceed 5-6 cm. It is because of this body shape that the species received the second name "ladies' stocking". In the aquarium, these fish prefer to be in the upper and middle layers of water.
When frightened or otherwise stressed, this species of fish can easily jump out of the aquarium.
For danios, schooling content in small groups of 9-10 fish is preferred. It is with this content that one can observe the play and the pursuit of males. There are other types of zebrafish. For example, in the aquarium hobby is also widely used voile zebrafish with beautiful elongated fins.
Novice aquarists very often ask how much danios rerio live at home. So, their lifespan with appropriate care and maintenance usually does not exceed 3-5 years.
Conditions of detention and feeding
Keeping and caring for a zebrafish is not particularly difficult. For a small flock of 5-6 individuals, a 30-liter aquarium is enough. It is best to choose the capacity extended in length, it will give maximum scope for movement of this brisk and agile mind. Thick thickets of aquatic vegetation can be created along the back wall of the aquarium, and the middle must be left free, the fish will romp there and eat food.
When planting a large amount of vegetation in an aquarium, be sure to remember about the level of illumination.
Zebrafish aquarium fish are extremely undemanding to temperature conditions. They can feel great both at + 30 ° and at + 15 °. The main thing is not to allow sudden drops. But for keeping individuals intended for spawning or developing fry, a temperature range of 21 to 25 ° C is preferred. It is precisely with such indicators that fish develop accelerated development of germ cells and intensive growth. Also, when the content of these fish requires a weekly replacement of 10 or 15% of the water of the total.
Under natural conditions, various small insects and their larvae form the basis of zebrafish feeding. In the aquarium, these fish can be fed with various types of live and artificial food. In general, this type of feeding is relatively unpretentious and can last for one or two types of dry food for quite a long time.
But if you make the right diet for these fish, then it must necessarily include not only dry, but also animal and granulated food. As an animal component, you can use a small moth or daphnia. The main thing that they were sufficiently crushed. With a properly formulated diet, the color of the fish will be unusually rich.
This type of fish prefers to select food from the surface or from the middle layers of water, but never from the very bottom. Therefore, when feeding you need to observe moderation and at a time to give a minimum amount of food.
Puberty of this species comes to 3 or 6 months. It largely depends on the conditions of detention and diet. Males can be distinguished from females by less bright bands and a more toned abdomen. The breeding of a zebrafish does not present any particular difficulties, it is quite capable even of a beginner aquarist. Malkov at a time displays quite a lot, and they grow quickly.
For breeding will need to prepare an additional aquarium. Its volume must be at least 5 liters. At the bottom of the aquarium, a layer of sand is poured and a protective net is put in, which will protect the eggs from eating. At the same time the water level should be no more than 10 cm.
10-15 days before the alleged spawning of several males and females, you need to be seated in separate aquariums with warmer water and begin to feed the animals with food. In males ready for spawning, the tail becomes more fluffy, and they also begin to show signs of aggression towards other males. In females, a significantly increased abdomen is a sign of readiness.
After the manifestation of these signs, a pair of males and the female are deposited in a previously prepared breeding ground. This is best done in the evening. If necessary, in sufficiently large aquariums several pairs can spawn at once.
During spawning, the fish move very actively. And the males are trying to catch up with the female, hitting her while in the abdomen. After each strike, the male produces milk. During one spawning, the female can sweep from 50 to 350 eggs. The final amount depends on the degree of readiness and the size of the fish. Typically, after a week and a half, females are ready to re-spawn. Each healthy female is capable of producing from 5 to 6 throwing caviar in a row.
Video: Spawning Danio Rherio
After the end of spawning, the producers are immediately removed from the spawning area, if this is not done, they can eat most of the caviar. It is also necessary to replace a third of all water with fresh.
The duration of the development of caviar is directly dependent on the temperature of the medium in the aquarium. For example, at 25-28 ° C, hatching begins at 30 hours, and at a temperature of about 16 ° this process is delayed for a week, or even one and a half. During this period it is very important to monitor the state of the eggs. Sometimes it happens that some of them die. Dead eggs look as if they are white from the inside. Using tweezers, they must be removed from the spawning grounds.
The newly hatched larvae hang on the walls of the aquarium or aquatic plants for the first few days. Then they start moving. To feed them, you first need a very small food, for example, infusoria are very well suited for this. Then in the development process it will be possible to give larger feeds.
For the maintenance of children, it is best to adapt a separate container with a water temperature of 26-27 ° C and a compressor. At lower temperatures, the development of juveniles is significantly delayed.
Possible breeding problems
Beginning aquarists very often face the fact that such unpretentious rioo refuse to spawn, or caviar is not viable. Most often this is affected by improper maintenance of fish. For example, if the fish were kept for a long time in conditions of high temperature and intensive feeding. To avoid this future producers contain at 17-18 ° and poor feeding, and only in preparation for spawning they increase the water temperature and increase the amount of feed..
Also in the process of spawning, it happens that the female doesn’t just leave the males to woo, hiding from them in aquatic vegetation. The main reason for this lies in the immature or overripe caviar. In this case, the female and the males are left for another day in the breeding ground. If the spawning process did not start anyway, and the female's abdomen is small in appearance, then it is deposited in a separate container for several days and intensively fed. Usually during this time caviar matures.
When overripe calf female also refuses spawning. In this case, she needs to help get rid of her. To do this, it is gently clamped between the thumb and forefinger of the left hand, and the calf is gently squeezed from it with the right thumb. With proper removal after 5-7 days, the female is again ready to spawn.
Danio rerio is an excellent species for keeping in a general aquarium. They are very easy to get along with related species, and with the vast majority of other non-predatory fish. Keep them better in small flocks with the number of individuals from 5 to 7 pieces. Danio is very active and sometimes it may seem to an inexperienced aquarist that they chase each other. But this is not at all the case, it’s just their way of life, in this way they communicate with each other.
Appearance and sex differences
Danio rerio has a narrow, long body. This aquarium fish is able to reach 5 cm in length. In the corners of the mouth there is a pair of small antennae directed downwards. The body runs several parallel stripes, painted in yellow, yellowish-green or black and blue. The strips begin near the gill covers and stretch across the whole body to the fin. A distinctive feature of females - stripes in the middle of the abdomen thicken, becoming narrower to the tail and head. The female has a more dense abdomen. The rest of the fins are yellowish white.
HABITATION IN NATURE
Danio rerio fish were first described by Hamilton in 1822. Родина рыбки в Азии, от Пакистана до Индии, а также в небольших количествах в Непала, Бангладеш и Бутане.
Существует десятки разных вариантов окраски и формы плавников аквариумной рыбки данио рерио. Самые популярные это вуалевые данио, альбиносы, данио рерио красный, розовый данио, а еще сейчас стали популярны искусственно окрашенные виды. These zebrafish are genetically modified, and are available in bright, fluorescent stains — pink, orange, blue, green. Although this color is very controversial, as it does not look natural, but so far the negative effects of interfering with nature are unknown, and such fish are very popular.
Danio rerio inhabits streams, canals, ponds, rivers. Their habitat depends largely on the time of year. Adult individuals are found in large numbers in the puddles of the rainy season and in the flooded rice fields, where they feed and spawn. After the rainy season, they return to rivers and large bodies of water. In nature, zebrafish feed on insects, seeds and zooplankton.
COMPATIBILITY WITH OTHER FISH
Great fish for a common aquarium. Gets along with related species, and with most other aquarium fish. Better contain from 5 pieces. Such a flock will respect its hierarchy, and less prone to stress. You can keep with any small and peaceful fish. Danio rerio chase each other, but this behavior is not aggression, but a way of life in a pack. They do not injure or kill other fish.
How to contain?
The content of danio rerio is not difficult even for a beginner. Such an aquarium fish is a schooling one, so it is better to settle together 8-10 individuals at once. At the same time, the volume of the aquarium should be at least 20-30 liters, although five fish can easily live in a small tank. In addition, you should prefer the elongated shape, as the fish will actively swim and sometimes play and chase each other, so that a limited length will make it impossible for them to move freely.
In the wild, zebrafish are accustomed to dwell in the upper layers of the reservoir; therefore, it is undesirable to fill the aquarium to the very top. In addition, it should be covered with a lid, so that frisky inhabitants accidentally jumped out and did not die.
The bottom can be filled with soil, and plant plants in it, for example, moriofillum, cabombou, sagittar and others. But the vegetation should not be too thick, so that the fish could easily frolic. You can make a free site: so you can watch the mobile games. If the algae is high, then be sure to take care of sufficient lighting, as the aquatic inhabitants in question love the light.
Caring for zebrafish involves maintaining the water temperature in the range of 20-25 degrees. And although such fish carry lower or, on the contrary, elevated rates, it is still better to avoid sudden fluctuations and changes: a stable environment will ensure good health and resistance to various diseases.
It is important to saturate the water with oxygen, especially in the summer, when it becomes warmer, and the fish breathing quickens. The optimum level of acidity is about 6-8 pH. Stiffness also should not be high, it is better to maintain it at the level of 3-18 units, although this indicator is not so important. And in order to keep the water clean and transparent, you should install filtering equipment and replace at least 15-20% of the total volume every week.
Tip: danio rerio is quite possible to settle with other fish, but not very large and not predatory. Although the danios themselves may seem to pursue each other and other neighbors, this is only a feature of the pack’s habitat, and not an attempt to kill a competitor.
Interesting fact: you can see that the fish spend a lot of time at the filter. But this does not necessarily mean that they lack oxygen. They just feel the flow and try to catch it, as in the wild.
If you are planning a breeding zebrafish, then you should know what they eat. In the wild, fish eat various insects that enter the pond, sometimes they eat the seeds of plants. When kept at home such aquatic inhabitants can be fed with not very large live or frozen food, as well as dry.
It is allowed to offer pets a trumpet or artemia. And the fish prefer to take food from the surface of the water, so first throw a small portion to attract them (then the food will not have time to sink to the bottom). Feeding is carried out daily and in moderation, although this type is not prone to overeating.