CATDOLL : CATDOLL: How to choose the big three-color koi fry

1. How to choose big three-color koi fry

In terms of color, the color of good quality fry is purer, thicker and more oily. The color of poor quality is lighter and has some mixed colors. Secondly, when selecting, you can stir the hatching tank to stir the water into a vortex. If the koi seedlings can swim against the current at the edge of the vortex, it means they are good fish. In terms of pattern, the pattern of good quality fry is more evenly distributed, and there are thick red spots on the body.

How to select Taisho Sanse Koi seedlings

First of all, you can choose from the color quality. The color quality of good quality koi is pure, thick and oily. The color of poor quality is lighter and has mixed colors. The lighter color makes it difficult to show its gorgeous posture.

Secondly, when selecting, you can stir the water in the incubator into a vortex. If the koi seedlings can swim against the current at the edge of the vortex, it means they are good seedlings. You can also take a small amount of seedlings and put them in a plate. If the koi swim more actively and struggle violently at the bottom of the plate after pouring out the water, it means they are good seedlings.

From the perspective of pattern, the pattern of good quality juvenile fish is more evenly distributed, with thick red spots on the body and clearer areas around the body. The tail should have a certain white base.

2. Can koi fry be fed corn kernels in winter?

You can feed corn kernels, but it is better to feed koi fry commercial baits, such as growth buds and germs, which are nutritionally balanced and easy to control the feeding amount. Otherwise, it is easy to cause exophthalmos or loss of swim bladder due to indigestion. I hope this answer is useful to you!

Feeding koi fry with corn alone is too simple in nutritional composition. You should mix the crushed feeds into pellets, or add water to the mixture and make it into a ball and feed it at a fixed point. Common feeds include fish meal, bean cake, wheat bran, vitamin elements for fish, salt and other raw materials.

3. Can I use Koi Uniform Fingerling Feed to feed medium-sized fish?

1. You can feed medium-sized fish with Koi unified fry feed.

2. Unified feed for young fish, comprehensive nutrition and easy to digest.

3. Juvenile fish feed is specifically designed for juvenile fish, has higher quality and stricter requirements, has many benefits for medium-sized fish, and has no negative factors.

4. Using Koi unified fry feed to feed medium-sized fish may be more expensive and costly.

Omnivorous. Koi are gentle in nature, like to swim in groups, are easy to raise, and have strong adaptability to water temperature. They can live in a water temperature environment of 5-30℃, and the water temperature for growth is 21-27℃. In addition to the high and low water temperature and the abundance of bait that can affect the growth rate of koi, there are also great differences in the growth of male and female fish. The age of koi is determined in the same way as most fish. The number of annual rings on the scales indicates the age of the koi.

4. Breeding techniques for dragon and phoenix koi

When fish float to the surface, it means that there is a lack of oxygen in the water. They have to absorb oxygen from the air to survive. Although they can sustain life for a short time, once their physical strength is exhausted, their lives will end. 2. Even if you change the water for the fish every day, it will still become turbid in one day. The turbid water means that the water quality has deteriorated, and then microorganisms and pathogens will multiply in large numbers, which will not only accelerate the consumption of oxygen, but also make the fish sick. 3. The habit of anchovies is that of bottom fish, and they like to move at the bottom of the water. Foraging is the instinct of fish. They will not be afraid to eat insects because they are big, but also because they have no appetite due to the lack of oxygen in the water.

How to feed goldfish and koi

Those who have just started to raise fish often experience fish death because they have not yet learned the knowledge in this area. Generally speaking, as long as you carefully raise and manage them, feed them fresh, feed them at a fixed quality, fixed quantity, and fixed time, pay attention to the stocking density, control the changes in water temperature, and maintain good water quality, you can raise goldfish well. The following introduces the minimum points that must be paid attention to in raising goldfish well for your reference.

To raise good fish, you must first learn to buy good fish:

1. The conditions for an excellent goldfish are: beautiful appearance, well-proportioned body, short body, wide tail fin, and obvious breed characteristics; beautiful color, rich and bright color, with a vivid and beautiful feeling at the first sight; beautiful movement, steady and elegant swimming, and beautiful appearance.

2. How to choose healthy goldfish Healthy fish swim, forage and compete for food in the middle and lower layers of the water body. They swim naturally and leisurely, get along well with other fish, and have clear, transparent and elegant tail fins. Fish that sink to the bottom, float to the top, swim in a struggling state, have external injuries, white hair, white spots, have thick, turbid, severely bloodshot tail fins, turbid eyeballs, dull body color, and live alone are sick fish and should not be purchased. When you first learn to raise fish, you need to accumulate skills. You don't have to choose perfect fish, but you have to buy cheap fish. Of course, buying healthy fish is something that cannot be ignored.

Before raising goldfish, you must prepare a fish tank that is not too small. This is mainly determined by the size and number of goldfish you raise. Pay attention to the density of fish. Beginners often buy the fish they like, and rarely consider how many fish can be kept in the tank. Even if you ask the fishmongers for their opinions, can they tell you to buy less for the purpose of profit? In my experience, at least 3 liters of water should be used to raise a 1 cm long fish. If your fish tank holds 100 liters of water, you can feed 3 10 cm fish and 8 5-6 cm fish (whose body is relatively narrow). In winter, the temperature is low and there is less feeding, so you can raise them more densely. Goldfish are more active in a larger space and have brighter colors. Too high a density can easily lead to lack of oxygen in the water and deterioration of water quality, causing the goldfish to become sick and die.

3. The new water prepared for goldfish should be stored for one or two days, which is called drying the water. The purpose is to remove some chlorine in the water and make the temperature of the new water close to that of the old water. If there is not enough time, when the temperature difference between the new and old water is not big, you can use an oxygen pump to blast the water with oxygen, and the dechlorination effect can be achieved in about 2 hours.

4. After buying goldfish, you must oxygenate them to prevent them from suffocating on the way home. Don’t rush to put the goldfish into the tank after you get home. Put the plastic bag containing the fish into the tank for 10 to 20 minutes before opening it. Let the water in the tank flow back into the bag several times and gradually mix with the original water in the bag so that the fish can gradually adapt to the water temperature and water quality of the new "home". If there is light, turn it off. Fish are quieter in the dark and are not easily frightened.

5. Do not change the water temperature drastically. Goldfish can survive in a wide range of temperatures. They can survive under the ice in winter and live normally on hot days as long as they are not exposed to the scorching sun. However, if the temperature changes drastically, they will become sick or die. When buying fish, you should pay attention to the water temperature of the aquarium store and the water temperature of your fish tank. The deviation should not be too large, and generally within 4 degrees is allowed.

6. Do not change too much water at one time, otherwise the water quality will suddenly change, which will cause the goldfish to suffer from water quality discomfort. Goldfish have adapted to living in the original water quality. If the water quality suddenly changes, the goldfish will not be able to adapt and will get sick or even die suddenly.

7. How to feed. Feed once or twice a day and finish eating within 5 to 10 minutes. Feed less on rainy days and do not feed at night. Fish need to consume more oxygen when digesting food. The air pressure is lower on rainy days and at night, and the oxygen dissolved in the water is also lower. Feeding fish at this time may cause serious lack of oxygen in the water and kill the fish. Most fish deaths occur at night, and this is the reason. The hunger and digestion and absorption of goldfish can be distinguished by the color of fish feces: if the fish feces are green, brown or black, it means that the fish is eating properly and absorbing well. If the fish feces are white, it means that the fish is overfed.

8. Food must be clean. Feeding unclean fish food can easily lead to fish diseases. Although goldfish like live food the most, and goldfish fed live food grow faster. However, live food grows in polluted water environments and is easily contaminated with bacteria, so it is necessary to be cautious when feeding live food. It is recommended to buy branded frozen fresh food produced by professional companies, such as bloodworms, brine shrimp, etc., supplemented with beans and vegetables to maintain comprehensive nutrition. Mealworms are also live food that goldfish like, and they have high nutritional value, so they can also be fed appropriately.

9. Keep the water clean. Goldfish eat a lot, consume a lot of oxygen and excrete a lot of waste, which pollutes the water and breeds bacteria. In order to keep the water clean, a filter should be installed. Every day, the waste and leftover bait should be removed from the bottom of the tank and one-tenth of the old water should be replaced. This should not be neglected, especially in summer. It is best to use a filter with an aeration design, so that the filtration and aeration can be carried out at the same time, so that the water can be purified and oxygenated.

10. Do not bring oil into the water. Oil will float on the water surface and isolate the air, so that the oxygen in the water cannot be replenished, which will cause the goldfish to die of lack of oxygen. Feeding meat or applying hand cream on your hands will bring oil into the water, which should be carefully avoided.

11. It is best to start with Wenyu goldfish. Wenyu goldfish have strong foraging ability, strong physique, and are less susceptible to accidental injuries. After accumulating experience, raising precious fish can reduce losses. Dragon and Phoenix Koi is a carp fish. It has bright colors like brocade and ever-changing patterns. It is a large ornamental fish and enjoys the reputation of "living gems in the water". Dragon and Phoenix Koi originated in China and was improved in Japan. After years of hybridization and breeding, a dragon and phoenix koi with very systematic characteristics has been formed. Dragon and Phoenix Koi breeding is highly valued by people for its considerable economic benefits. Since Japanese Koi was introduced to my country in the 1980s, after nearly 20 years of development, especially with the increase in people's consumption demand and the improvement of people's appreciation level, a large-scale Koi breeding has been formed throughout the country, especially in the Pearl River Delta, and has become a very profitable export product. The pond breeding technology of Koi is introduced as follows:

1. Choice of pond

As an ornamental fish, the dragon and phoenix koi, in addition to its growth rate, also emphasizes the cultivation of beautiful image during the breeding process. The cultured products are required to have beautiful body color and beautiful body shape. In addition, the quality of the environment directly affects the body color of the dragon and phoenix koi. It is best to choose humus soil for the pond, the terrain is leeward and sunny, and grass is planted in the water. The purpose of improving the living environment of the dragon and phoenix koi is achieved by artificially improving its living environment. The water is preferably spring water, so that the various mineral elements and other components in the water can increase the pigment of the fish body, making the koi body color more bright and beautiful, and the dissolved oxygen is sufficient.

2. Breeding of Dragon and Phoenix Koi

The breeding age of dragon and phoenix koi is generally between 3 and 10 years old, and the weight should reach more than 1.5 kg. Select excellent, strong, unharmed, disease-free broodstock, and separate males and females one month before the breeding season. The breeding time of dragon and phoenix koi is generally around May every year. When the water temperature is stable above 16℃, male and female koi can be selected in a ratio of 1:3 and placed in the prepared pool. A disinfected fish nest should be placed in the pool in advance. Let them lay eggs on their own. After observing that they have finished laying eggs, immediately remove the broodstock and leave the fish nest in the pool for incubation. After 5 to 7 days, the fry will be hatched and then cultivated.

3. Free-range feeding

In courtyards and hotels, cement pools can be built for the purpose of viewing. The pool should not be too deep, preferably 0.6 to 0.8 meters, for easy viewing. This type of breeding is single breeding, and the density can be slightly larger, 3 to 5 koi can be raised per square meter. For large-scale cement pool breeding, the stocking density is preferably 1 to 3 per square meter of water surface, and grass carp, silver carp, bighead carp, etc. can be appropriately mixed for breeding. Feeding adopts the "four fixed" method, generally feeding twice a day, morning and evening, in the morning after sunrise, in the afternoon before sunset, the daily feeding amount is 2% to 10% of the fish body weight, and it is better to eat it in 20 to 30 minutes, and the types of feeding bait should be varied. At the same time, the bait is required to be pollution-free and non-corrupt.

4. Management and Disease Prevention

Daily inspections should be strengthened. The dragon and phoenix koi breeding ponds used for viewing should be kept clean and tidy so as not to affect the viewing effect. New water should be added regularly or micro-flow water should be used for breeding. For aquarium breeding, attention should be paid to changing and diluting water to keep the water fresh and at a suitable water level. Pond breeding requires the water quality to be "fat", "live", "tender" and "refreshing" to facilitate the growth of koi. In hot and rainy weather, attention should be paid to oxygenating the pond to prevent the occurrence of flooding. Dragon and phoenix koi generally have strong vitality and rarely get sick, but attention should be paid to disinfecting the breeding pond and the fish body. For aquarium breeding, 3% salt solution can be used for short-term flushing when changing water. For pond breeding, common drugs such as quicklime and trichlorfon should be applied regularly, and furan baits should be fed. For ponds with serious diseases, timely diagnosis and treatment measures should be taken. At the same time, attention should be paid to prevent water birds, snakes, mice and human hazards and damage to avoid unnecessary economic losses. Generally refers to 15-35cm. For red and white, bold large patterns are more promising than cute small patterns. Well-configured patterns in the juvenile period will become more distant as the fish grows, and will appear uncoordinated when they grow up. Koi with large patterns may not look good in the juvenile period, but with the addition of an appropriate white base after they grow up, the coordination of patterns will appear very beautiful. To purchase juvenile fish with high quality when they grow up, the head bones should be thick, the body should be smooth, and the tail should be thick. For red and white, the white base should be pure white. If there are some small spots on the fins, they will disappear as they grow. It is better to have a darker red class and neat edges. The uniformity of the red class is more important than the thickness. As long as the texture is even, the edges are clearly defined, and the white base is flawless, the future is better. ① Before purchasing, you must be familiar with the habits and breeding methods of the fish you want to buy. Don't just buy a beautiful fish.

② Make sure to buy healthy fish. The identification method is: first check whether the fish's skin is congested, scales are falling off, there are white spots and white hair, there are wounds, or the fins are damaged. Sometimes you need to look from the top, and you may see it more clearly if there is light; then see whether the fish swims easily and balanced, and whether the fins are stretched naturally; third, see if there are dead fish or sick fish in the same tank; fourth, see if the water color of the fish tank is normal. If the water color is abnormal, it may be that the boss is treating the fish; there is also a method that people often use, which is applicable to certain species of fish: shake your palm back and forth in front of the fish tank. Healthy fish often have a strong appetite and will chase the palm;

③ Don’t buy fish with physical defects unless you think the defect will help you breed new varieties;

④Don't be too greedy for cheapness, as you often end up buying a lame donkey with cheap money. As an ornamental item, it is very uncomfortable to have defects; ⑤Try to buy underage fish, firstly to save money, and secondly, it is easy for them to adapt to the environment. If you buy old fish, they will have poor adaptability to the new environment, and what's the point of keeping them alive for a short time? ! Of course, you can't buy fish that are too small, firstly because they are weak and difficult to feed, and secondly, some of their characteristics are not yet manifested, so it is hard to say whether they can grow into fish that meet the requirements in the future; Dragon and Phoenix Koi

⑥ It is best to choose from a large batch of fish, firstly, there is a lot of room for selection, secondly, the price is cheap, and thirdly, it is not easy to buy residual fish or discarded fish;

⑦ It is best not to buy fish that have just arrived at your local area, because you don’t know whether it can adapt to the local water quality or whether it is sick. It is better to let it stay in the aquarium store for a week before buying.

5. Carrying fish

Fish are usually carried in plastic bags. Be careful not to leak and not to be too small. Do not fill the bag with water, leaving 1/3-1/2 of the space to be filled with air. For long-distance transportation, the plastic bag can be filled with oxygen, or oxygen-enhancing tablets can be placed to ensure that there is no lack of oxygen during the journey. In the summer, the temperature is high, and salt and antibiotics can be added to the water. In the winter, it is cold, and foam plastics can be used for insulation. For high-oxygen fish and high-grade fish, the density in the bag should be appropriately reduced. 1. "Hanging fish" or "pouring water"

The water temperature and water quality in the plastic bag of fish brought from outside are different from those in your own tank. If you put the fish directly into the tank, the sudden change in water temperature and water quality will make the already exhausted fish even worse, and it is easy to cause the death of the fish. The solution is to "hang the fish" or "pour the water".

"Hanging fish" can only solve the problem of water temperature difference, and is suitable for general fish that are highly adaptable to water quality: put the plastic bag carrying the fish into the tank, let it float naturally on the water surface for 10 minutes (the time can be appropriately extended in winter), and when the temperature of the two is consistent, pour or scoop the fish into the tank. I prefer "scooping" because I am not sure about the water outside. Of course, "pouring" also has its advantages: it does not touch the fish body, and the fish is not easily hurt.

"Pouring water" may be more gentle. This method is recommended for fish with high water quality requirements: gently pour the water and fish in the plastic bag into an open container, slowly add water from the tank to the container, and let it stand for 5 minutes when it is about 1/5 of the original water volume, then pour out 1/5 of the water in the container, then add 1/4 of the water from the tank, and let it stand again... The amount of water poured in and out can be appropriately increased each time. After repeating this 7-8 times, the water quality of the two is basically the same. Then put the container into the tank and let the fish swim out of the container by themselves, and you're done! Note that if it is winter, it is best to let the container float in the tank during the standing process to ensure that the temperature gradually approaches, because if the room temperature is low, 5 minutes is enough to cool the water.

2. Isolation breeding

It is best not to put the newly bought fish directly into the breeding tank. Instead, put them in an isolation container and raise them for a period of time. Otherwise, if fish diseases are introduced, it may cause the whole army to be wiped out, and it will be too late to regret it then!

Glass tanks are preferred for isolation containers, which are easy to observe. The volume can be slightly smaller than the breeding tank. No sand or grass should be placed in the tank. Add gentamicin injection after the fish are put in. You can use twice the weight of the water in the tank as the body weight, calculate the daily dosage of the human body as the dosage, and put it into the tank at one time. The isolation breeding time cannot be less than 1 week. During this period, pay attention to observation and deal with the disease in time. Make sure that there is no disease before moving it into the breeding tank for normal breeding.

3. Feeding

After the fish are placed in the breeding container, the most basic work every day is feeding. If you feed too much, there will be a lot of leftover bait, a lot of fish feces, and the water quality will easily become turbid. If you feed too little, the fish will naturally not be full. The number of times you feed and the amount of each time should be controlled according to the specific situation. Fish have different requirements for feed depending on the species, size, development stage, and water temperature. For example, within the optimal growth temperature, fish are active, have a strong metabolism, and need more food; if the temperature is close to the lower limit that the fish can bear, the fish rarely move, and the amount of feeding should be reduced; Koi carp need more food than ordinary tropical fish; young fish should often be fed more frequently than adult fish. Generally, the number of daily feedings should be controlled between 1 and 3 times. The amount of feed each time should be controlled according to the size of the fish, the number of fish, and the number of daily feedings.

If you feed once a day, you should feed enough to make the fish full. There should be room for feeding. If you can't finish it at that time, you can finish it within the same day. If you feed 2-3 times a day, feed until 80% full, and finish it within about 10 minutes, without leaving any residual bait. For the same kind of fish, if you feed fine bait such as fish worms, the eating time can be appropriately longer, and if you feed larger bait such as small fish, the eating time can be appropriately shorter; for the same kind of bait, the eating time of small fish can be appropriately shorter, and the eating time of large fish can be appropriately longer. When feeding, it is best not to feed enough bait at one time. You can feed it in 2-3 times, and feed part of it after the last bait is basically eaten. This will not only not be easy to overfeed, but also stimulate the appetite of fish, and at the same time prevent a large amount of bait from falling into the bottom sand when the fish has no time to eat it. How do you know if the fish is full? You can observe the feeding situation after each feeding. At first, the fish reacts quickly, swimming up to eat, one mouthful after another, and then it slows down and is not so excited. Later, it ignores the bait or swallows it hesitantly, indicating that it is full. Write down the total amount of feeding this time, and after a few days, you will know the fish's "appetite".