Ryukin crucian | Facts & Information

Origin

There is evidence that the fish dates back to 1833, but it is said to have been in Japan in the 1770s. Japanese literature calls the fish"Onaga" or "Nagasaki crucian".

Feeding Ryukin Crucian Carp

One of the biggest problems you raise caring for crucian carp is the fact that they make a lot of mess, which can cause the concentration of ammonia in the aquarium to increase. Goldfish would always eat but their stomach is much smaller than the cravings they have, for them it fits very well z icala: eyes are two and mouth is one.

That's why try to give them as much food as they actually need. Make them one serving, but it is preferable to feed them several times a day from this serving. Special flaky food for goldfish is a sufficient basic diet.

But it would be good to supplement it with spinach or boiled salad and live food such as shellfish, artemia or tubifex worms. To emphasize: give them small amounts at each meal. Due to the fact that they produce so much debris, be very careful about the quality of the water. If the water in the pool becomes cloudy, you will have to change a quarter or more of the amount of water in the aquarium, such a change should be made weekly. Give them less food.

If they are fed floating goldfish tablets, care should be taken to soak them in water to swell. Otherwise the fish will swallow them dry and the tablets will swell in their stomachs.

The belly of the fish will fill with air causing the development of swim bladder disease and the fish will float either on its side or with its belly up. Goldfish will quickly learn that you are the one who feeds them and will come to the glass of the aquarium when you enter the room. They are fast swimmers and it is a pleasure to watch them.

Features Ryukin Crucian Carp

For two goldfish it takes at least 75 liters of water. This aquarium might seem too big when the fish are small, but they grow quickly. The water must be chlorine-free. For this, it would be best to buy a chemical dechlorinator that you can buy from any specialty store.

A good filtration system is also needed to filter the water mechanically and biologically, and an air pump is also recommended to help the water circulate.

The heater is not needed if the temperature in the room remains within the limits of 20-24 degrees Celsius. These fish can also endure cold water, as long as the water temperature does not change suddenly in a very short period of time.

If you put stones in the aquarium, which is not necessarily necessary, you must be careful to clean the debris fallen among the stones. For this you can use a vacuum cleaner connected to an air pump.

Ryukin crucian is similar to the veil-tailed crucian, the only difference is the hump that begins as soon as the head ends. It is almost as tall as long, and the dorsal fin makes it appear even taller.

Initially the ryukin crucian was red, but today it can be found in a wide variety of colors: white, red, chocolate, blue, and variations. All specimens must have, apart from the dorsal fin, the rest of the paired fins.

When it comes to space Ryukin crucian, like the rest of the crucian carp, is picky. If when it is small it can handle in an aquarium, at maturity it can reach 20-30cm.

If you want to buy ryukin goldfish, whether male or female, avoid specimens that are not Lively or float. This may be a sign that you are sick.

Breeding Ryukin Crucian Carp

The reproduction of the Ryukin crucian is similar to that of the Golden crucian.

Although considered very easy, the reproduction of Golden crucian carp still presents an inconvenience: the difficulty with which we differentiate the sexes of fish. Reproduction is similar for all varieties of Goldfish.

The first step to successful breeding is to make sure you have at least one viable breeding pair, although the ideal is to have 2 males for each female. Goldfish reach sexual maturity only at the age of 1 year, and sexual dimorphism is nonexistent in fish smaller than 8cm.

In adulthood, females have a noticeably larger abdomen than males. Males develop small white tubercles on the gills and pectoral fins during breeding. Some females will also develop such tubercles, but never as many as males. It is ideal to feed the fish with a variety of foods and in sufficient quantity to ensure that you will benefit from viable and healthy offspring.

Also, to stimulate reproductive activity, feed the fish with live food (for 2 months before spawning), keep the aquarium water clean and well oxygenated, at a temperature of 20grc. If you have the opportunity, it is very good to keep separate females from males until the mating season (spring), this procedure favors reproduction.

The spawning aquarium must be at least 100l (depending on how many breeding pairs you will use), filled with water with a maximum height of 30-40cm for the eggs to be deposited quickly. Stale and well-filtered water must be mixed with water from the spawning aquarium. If necessary, use a small heater to keep the water temperature at 20grC and a filter adjusted to the lowest flow rate.

The filter should not create drafts because the Fry are very sensitive. It is advisable to add a few groups of plants with dense leaves (Cabomba, Elodea), they will give the female the opportunity to take refuge from the male.

On the bottom of the aquarium, about 3cm high, you will need to place a frame with net that enters the aquarium fixed (without leaving spaces where the fish can insert their heads or bodies). The frame must be made of stainless steel or brass wire, and the mesh must have meshes of about 4-5mm.

The net will let the eggs pass and settle on the bottom of the aquarium, thus preventing the parents from eating them. You can also use a specially designed nylon mop on which the eggs will stick. Parents will immediately eat the eggs if they are not protected, so nylon mesh or mop is needed.

The aquarium will have to be ideally positioned in such a way that the first rays of the rising sun fall on it.

If you notice that the male is chasing the female and punching her with his snout in the abdomen, it means that it is time to prepare for reproduction. The Ideal is to use several fish, usually respecting the proportion of one female to two males. Fish should be introduced from the evening in the spawning aquarium.

Golden Crucians start spawning very early in the morning. Thus, the male will frantically " run " the female around the plants until it exhausts her, at which point the female will lay eggs that will be fertilized immediately with the male's milk. If the fish did not spawn, you can leave them in the aquarium until the next day to give them the opportunity to spawn. A female can produce from several hundred to about 1000 eggs.

Golden crucian eggs are sticky and will immediately adhere to the plants, the nylon mop or the bottom of the aquarium. They have the appearance of small transparent or brass spheres, with diameters of about 3mm and can be hardly noticeable on the bottom of the aquarium. If the female has laid eggs she will have a much thinner abdomen. After spawning immediately withdraw the parents from the spawning aquarium.

After 48-72 hours from spawning will emerge larvae that will catch plants and aquarium glass and will remain there for 1-4 days. When the fry begin to swim freely they will have to be fed (never before!) with naupli of Artemia, microworms or hard-boiled egg yolk.

If you use egg yolk, do not offer it in large quantities because it alters water very easily. Feed them about 4 times a day. All this time you will have to keep the aquarium very clean, remove the debris left behind parents and maintain the temperature at values of 21-22grc.

It is good to remove with a pipette sterile or rotten eggs so as not to infect healthy eggs. Compromised eggs look either like white, misty or black spheres. You can add a few drops of methylene blue to the water to avoid the development of fungi. The filter must be kept at very low flow rate.

After about 2 weeks the Fry will start to look like fish. After 4 weeks begin to change about 10% of the water in the aquarium. About 1 month after swimming freely the fry can be fed with fine flakes, and after about 3 months (when they measure about 3-4cm in length) they will begin to change their color. However, it may take more than 1 year for goldfish to develop their final color.