Hello dear aquarists. Today’s article will be devoted to such a wonderful aquarium fish, as danio rerio. The homeland of this aquatic habitat is slowly flowing and standing bodies of water in Southeast Asia.
Basically, a fish spends all its time swimming between plants and stalks of coastal grass hanging in the water. It is in such conditions that danios are looking for food – tiny invertebrate organisms.
Immediately, the process of spawning, spawning and growing of young stock takes place.
It so happened that the rerio became the most popular aquarium fish along with red neons and rhodostomuses. It is very interesting to watch them, as it is agile and fun.
It is possible to keep zebrafish even in small aquariums, where they are kept mostly in the upper or middle layer of water. If they are very frightened, then in the absence of a cover glass they can jump out of the aquarium.
Best of all, if you keep this interesting fish flock in the amount of up to 10 individuals. Males continuously play with each other and flirt in front of females. Everyone who watched this action, was enchanted by the graceful movements of the fish and was delighted.
And what else is needed when you sit in a comfortable chair and watch a peaceful life in your creation? Especially after a hard day’s work, falling into an armchair and relaxing in front of an aquarium is a supreme pleasure!
I would like to mention a very original striped coloring danio rerio. The body of the fish is narrow and oblong, in aquarium conditions it grows up to 5 centimeters in length. In the corners of the mouth there is a pair of tiny whiskers pointing down.
Along the entire length of the tala of the fry, a series of yellow-green, black-blue and straw-yellow stripes, which start from the gill covers and end on the tail fin. The rest of the fins have a white and yellow tint.
A female from a male can be distinguished by a full abdomen.
As I said a bit higher, the fish is unpretentious to the conditions of detention and in a 10-liter aquarium can easily fit five individuals. In order for your pets to be grateful for the conditions, it is better for them to choose an aquarium that is not very wide, but long, since they are lovers to swim from one end to the other.
Densely plant an aquarium with an elodia, a saggitaly and spiral vallisneria. Just do not forget to leave near the front wall of the jar enough space for the gulki fish and for unhindered feeding.
Naturally, if the bank you have a large number of plants, do not forget about the good illumination of the aquarium.
What I like more in danio rerio is their impartiality to temperature conditions. They can withstand the water temperature at + 15 ° C and + 30 ° C without any problems. However, if you plan to breed the fish, for normal development and producers, and young stock, it is better to keep the temperature around 25 ° C. It is at this temperature that the fry grow fastest and the sex products mature rather quickly.
If you raise the temperature to 30 degrees, this process will accelerate, but as you already know, if you read my previous posts, the warmer the water, the less it is enriched with oxygen. Therefore, do not forget in this case to carry out aeration of the aquarium.
For the good health of the fish, it is desirable to replace every week up to 15% of water to fresh water and monitor its hardness and acidity. The optimum stiffness is considered to be 15dH, and the active response of the medium is 6-7.5pH.
You can feed danios with almost all small dry or live food. Fully mature fish becomes six months old.
To provoke pets to spawn is not as difficult as it seems at first glance.
You will need to set aside the manufacturers separately from each other, make the water temperature above 20 degrees and intensively feed them with daphnia or bloodworms. When the female is ready to spawn, you will notice this on her rounded belly.
When it is filled with caviar, the grub noticeably thickens from the sides in all areas. As a spawn, take a small container with a glass bottom.
Professionals advise and I, in principle, agree with them, do not lay sand on the bottom, because it does not see the process of throwing caviar. Be sure to in banks with a flat bottom, lay down the quality of fountaininis and topnyak, which gently press with stones. If the bottom of the bank is concave, then it is better to lay the Javanese moss around the circumference where the notch is and press it with stones.
Water for spawning take from the general aquarium, after passing it through the siphon and diluting it with fresh water, rich in oxygen.
You should not make a large water level in spawning, 8 centimeters will be more than enough. So you get a centimeter 4 spaces above the moss.
In the spawning place is placed one female and two males around the evening and it is advisable to put a jar near the window. It so happened that the water temperature does not play a special role.
It was observed that danios perfectly spawn at both 25 ° C and 17 ° C. During the night, the fish will get used to the new conditions and closer to the morning, when the plants begin to emit oxygen into the water and the container is properly lit, only then will the spawning begin.
I have never seen sharper fish movements in an aquarium than mating danios. The movements are so lightning that sometimes you look at them and it becomes bad, but you yourself think: “How is it that their head has not yet begun to spin? “With such a whistle dance, the males do their best to cut the female on the belly, knocking out all the crap and caviar from it. This process lasts only five to six minutes without a break, and the process itself rarely exceeds an hour in duration.
How many eggs does a female produce at a time? This is a rhetorical question, since the number of eggs directly depends on the degree of readiness of the fish for spawning and its size.
I can only name the range of eggs per litter: from 50 to 400 pieces.
You can get daniorerio’s offspring from a couple especially, but as practice has shown, the caviar in such cases is not sufficiently fertilized. Therefore, most aquarists resort to the tactics of a single “nest” (two males and a female). If you have a spacious spawning ground, then of course you can also define several “nests”.
As soon as the roe-throwing is over, the producers are removed from the spawning area, while it is also important to set aside females from the males. After a week or two, you need to repeat the label.
Otherwise, the caviar can overripen and the fry will not, and the female sometimes does not want to spawn at all. Itself has more litters in a row that was noticed – 6 pieces.
There are cases when he has planted a female to spawn, and she, like a sheep, has crouched in some deaf corner and does not wish to spawn. Most likely there are two reasons: either the sex products overripe, or not matured. In both cases, leave the producers for several days together in the aquarium and do not feed them.
It is possible to give the moth only on the second day. If you still did not wait for spawning, and the belly is not full, then again set off the producers separately and feed them well for several days.
It happens that a full female turns to throw and even then you crack her. In this case, it is caught and put on a wet fleece.
Then it is wrapped in a cotton wool and gently pressed with the index finger abdomen squeezing caviar out of it. If you have everything in order with your hands and the procedure is performed with surgical precision, then after five days the female will pick up the calf again and can be planted to spawn.
Sometimes, males work and do not want to spawn. The female swims around the bank, and the males do not react to it. In this case, you need to keep the nest in the spawn for two days, and then sit down and raise the temperature of the water in the tank with the males.
Feed them hard until the boys start chasing each other intensively.
Very often, I heard complaints from amateurs on the forums about the fact that the rerio tossed nasty caviar or didn’t throw it at all. This can be explained by the fact that the fish were incorrectly kept. Most likely, the future producers were kept at high temperature and well-fed for a long time before spawning. This provoked the ripening of caviar and it later became “older”.
And no one will throw old caviar. To prevent such freelance cases from occurring, it is better to keep specimens for spawning at a temperature not exceeding 19 ° C in the winter season and do not feed them for slaughter.
The ripening period of the eggs depends on the temperature conditions in the aquarium. If at a temperature of 28 ° C the fry will appear in one and a half days, then at a temperature of 16 ° C the young growth will appear in two weeks. As soon as the small things come out of the roe, at first they will attach to the plants and walls of the aquarium and hang like that.
At first, they are fed with “dust” or infusoria, and gradually as they grow older, larger feed is added to the diet of the young. If you keep the water temperature around 27 ° C, good aeration and abundant feeding, then the mature small things become three months old.
The lower the temperature, the slower the rate of development.