The first acquaintance with leopard danios in European aquarists occurred in 1958, domestic aquarists got acquainted with these brisk and interesting fish two years later. But Russian aquarists are a little unlucky with the pedigree.
If the other closest relatives have a clearly defined place in the systematic series, then this cannot be said about the leopard danios, unfortunately.
To this day, ichthyologists doubt: whether to assign leopard danios to a separate species, or to attribute the status of a subspecies. Some scientists are inclined to believe that leopard danios are a banal joke of nature, whose initial form is considered danio rerio.
That is, until now, scientists can not determine their homeland habitat and a clear time of appearance in domestic aquariums.
However, despite all these difficulties with the definition of fish, hydrobionts are widely popular with our aquarists. And there is nothing to be surprised at, since the fishes have relatively small sizes (up to 6 centimeters), they are very mobile in the aquarium, have an attractive color, and also fish are undemanding to the conditions of detention.
And this, as you know, is very important for beginning aquarists.
Unfortunately, leopard danios do not have a catchy color. The body is tuberous and flattened laterally, the color is golden yellow with a scattering of black dots, which, when reflected, take on a purple hue.
The location of the points, their size and ebb are as unique as the fingerprint of a person. There are individuals in which the points are arranged in the form of a line, or create intricate zigzags.
Therefore, if you try to find a certain pattern in the coloring of this fish, you will definitely fail. Externally, the color scheme of the fish is very similar to the skin of leopards.
Fins have a light yellowish tint. The intensity of color, for the most part depends on the mood of the fish, belonging to a certain population and condition. The anal and caudal fins have numerous dark strokes that run parallel to the rays, but the ventral fins have a brighter color, although they are very similar in appearance.
Unlike the rest of the fins, the dorsal has more contrasting colors, and the same border is white or yellow.
Like other representatives of the genus, leopard danios have a pair of antennae, which, as a rule, are pressed and hardly noticeable to an aquarist, if the fish does not make active probing at this time. However, according to ichthyologists, mustaches serve to navigate in space and look for food.
Due to its unpretentiousness, leopard danios are able to live in virtually any bank. However, it is preferable that the aquarium is not deep and elongated.
Danio is famous for its sharp throws, therefore, it is recommended to cover the aquarium with a lid or a cover glass so that the fish do not jump out. But catching aquatic animals from the aquarium is quite simple, and this despite the fact that they are extremely nimble.
Due to their excessive curiosity, they voluntarily swim in the net.
Hydrochemical parameters of water, its temperature and composition do not play a key role. Fish can live well in cold aquariums at a temperature of 16 to 18 degrees, and in the warm at a temperature of 24 to 26 degrees.
However, conventionally, we will assume that for fish the optimum water temperature should be 24-25 degrees, a hardness of 10 to 16, and an active reaction close to 7 pH.
Since leopard danios is an active fish, they like to rush through open water with periodic maneuvering through the thickets of plants. They can fly at full speed through the dense thickets of spiral vallyseeria or the large bush of the gebelite bolbilitis.
But do not think that if the plants are not a hindrance to the fish, then the aquarium should be immediately planted with grass, swimming places should be in any case.
There are also no problems with feeding fish: danios perfectly eat frozen, dry and live food. Due to its briskness, fish are the first to go to the feeders and, during feeding, can snatch food from the mouth of other inhabitants of the aquarium.
Fish still prefer the food that will float on the surface, but in some cases may sink to the bottom for food. Despite the rather shallow mouth, the zebrafish is able to eat a large bloodworm with great appetite.
In leopard danios, there is another interesting feature – the voile form is widespread, which by its mobility is not inferior to ordinary fish. Accordingly, if you want to decorate a flock, then you can contain both voilev and ordinary fish.
And do not be afraid that the veil fishes will remain hungry because of their more modest relatives.
Leopard danios become sexually mature at the age of 4 months. Females from males at this age easily differ in the rounded abdomen, which in males remains straight and beater.
Fish spawn in both common aquariums and in individual spawning grounds. The most proven incentive for reproduction is a partial water change.
If you make a substitution in the first half of the day, then in the evening, or the next day, spawning will begin, but this is on condition that the producers are in good shape.
Unfortunately, danio roe is a very tasty food for all neighbors. Even if the spawning proceeded in the lower layer in the thick grass, only a small part of the eggs can eat for 10 minutes. This moment concerns only neighbors, parents do not eat their caviar.
In order to preserve the future offspring, manufacturers should be transplanted into a separate small aquarium (up to 5 liters). In the case of schooling spawning, the sex ratio does not play a special role, because fish do not have regular partners.
Each male will take turns chasing all the females, creating a strong turmoil in the spawn, which will be accompanied by a “hail” of eggs.
After a few hours, the bottom of the aquarium will be littered with transparent eggs. At the end of the spawning period, producers can be transplanted into a common aquarium.
After transplantation, leopard danios do not experience stress. Even if you transplant fish in the process of spawning, the fish will continue to spawn at the new place.
The fecundity of adult female leopard danios is about 500 eggs. Parameters of water do not matter, because the offspring is strong and numerous. A large temperature run affects only the rate of development of fry and caviar.
For the first time, the danio larvae hatch out will hang on the walls of the aquarium or lie at the bottom still. Two days later, the fry begin to blur in the aquarium.
With good and nutritious feeding, the fry grow quickly with small losses. The main thing is not to forget, as the fry grow, to transfer them to larger types of feed and periodically make partial substitutions.
In addition, do not allow the overpopulation of spawning and transfer fry to large aquariums. But even with the transfer of fry to the general aquarium, it is not necessary to rush, as they can be easy food for adult inhabitants of the aquarium.
And in this case, easy prey will not be embarrassed and parents.
In captivity, leopard tributes can live from 3 to 4 years. Fish diseases are fairly stable, the only problem is an accidental unknown disease, such as dropsy, which is accompanied by severe swelling of the body and ruffling of scales.
Sick fish will be active and voracious, but after a few weeks they will still die. Such a sore, as a rule, mows down about 1/3 of the flock without harming other fish.