Dear colleagues. In today’s article I would like to tell you about a fairly popular fish among foreign aquarists called the red-tailed xenotoka.
Of the representatives of the Gudeev family, the hero of our article today is the most popular. The fish is simple to maintain, the only condition is that it will be necessary to acquire a large and spacious aquarium, since the aquatic species is quite mobile.
Most often, red-tailed xenotoka, or Eisen. In Europe, this fish first appeared in the 70s of the last century.
For the first time in the Soviet Union, this fish was introduced in 1975 and has since been successfully maintained by aquarists. In nature, xenotoka lives in lowland rivers and lakes of Mexico.
The maximum recorded length of the body of the fish in natural conditions was 9 centimeters. In aquariums, it is less than a few centimeters to such dimensions.
The red-tailed xenotoki has a high body flattened on the sides, the head is small. The base of the tail is slightly thickened. Males are painted in olive or greenish-beige shade.
The back can be both gray-green and greenish-beige, while the abdomen is yellow with a silver tint. With side lighting scales will cast turquoise hue. The tail fin at the base is orange-red, from where the fish got its name.
With age, the red color begins to move to the tail and its color becomes more vivid and intense. All other fins may be black-blue or dirty yellow.
The color of the females is not so interesting. The body color is greenish gray with a silver tint.
For a comfortable maintenance of a hydrobiont, you will need a spacious aquarium from 100 liters of volume to 8-10 adult fish. It does not need a densely planted aquarium plants. Water is preferred not old and rich in oxygen.
With a lack of oxygen dissolved in water, xenotoks will rise to the surface and begin to gasp for air.
Favorable conditions of the fish are the following:
- Water temperature is 22-25 degrees;
- Stiffness – from 10 and above;
- Active medium reaction 6.8 – 7.4 pH;
- Weekly substitution in the amount of 1/3 of the total.
Gidrobiont prefers to eat animal feed, but never refuses to use live food in a dry form. Like other members of the Gudeev family, the xenotok is a live beetle. But they are very different from petsilievyh, since the xenotok has threads of trophogenia, which connect the body of the embryo with the parent.
This is a kind of umbilical cord. These threads provide germ gas exchange and nutrition. The gestation of the female is between 6 and 8 weeks.
When the fry are born, in the first 48 hours of their life the remains of the umbilical cord will still hang down under the abdomen; after two days, the “umbilical cord” will disappear.
Unlike petsilievykh, in which females have enough fertilization for several spawning, females are fertilized by males before each spawning. The male genital organ is formed by the first four front rays on the anal fin.
From the remaining rays of the genital organ is separated by a notch.
The process of flirting in front of the female begins with a demonstration of its colors, which is expressed in spreading its fins. Very often several males can look after one female. Mating occurs at the moment when the fish are pressed against each other sideways.
A female ready for breeding is deposited in a separate aquarium, since in the general aquarium all offspring will be eaten. A couple of days before giving birth, a female can produce characteristic movements of the back of her body.
Youngsters of rather large sizes – 10-16mm. Immediately after birth, the fry will rush to the surface of the water. Unfortunately, red-tailed xenotoks have a poor productivity – no more than 50-60 fry.
There are cases when the first few days of life the fry will swim under the slope, but after a couple of days their body position will even out and they will swim like normal fish.
There are also cases when females die immediately after giving birth. This is due to the fact that in her body remained unborn embryos, which she could not give birth to.
Immediately after birth, the fry can be fed with small cyclops and daphnia. In addition, it is advisable to lightly salt some water in the aquarium with fry (tablespoon of table salt per ten liters of water). Growth of young stock is very good, at the age of several months the aquarist will already be able to determine the sex of each fish.
Puberty occurs at the age of 3.5 months.
Under the conditions of captivity, red-tailed xenotoks for more than three years, as a rule, do not live. This aquarium fish has one very unpleasant feature – it loves to bite off the fins, like its relatives, and other fish. There is a similar negative trait in Sumatran barbs, which also don’t mind biting off a fin.
Perhaps this negative trait prevents the wider distribution of this fish among fans.