CATDOLL : CATDOLL: What should we pay attention to when breeding adult freshwater cod? How can we improve the breeding technology?

1. What should be paid attention to in the breeding of adult freshwater cod? How to improve the breeding technology level?

Adult freshwater cod can be raised in open ponds, cages and industrial farms. Currently, open ponds and factory farming are mainly used. The outer pond farming area is generally 5-20 acres, with a water depth of about 3 meters. Water intake and drainage should be convenient. The power of the aerator is set at 0.6 kilowatts per acre. Water buried mud ponds are generally used for factory farming, with an area of ​​50-500 square meters, a water depth of more than 1.2 meters, and an aerator power of 5 watts/square meter. Shading and heat preservation can be carried out according to the needs of farming.

When the size of freshwater cod fry reaches more than 3 cm, the fish have begun to consume artificial feed and can be put into the breeding pond for adult fish breeding. The stocking density in the outer pond is generally 1500 ~ 3500 fish/mu. The breeding density depends on the breeding conditions, and the factory breeding density is 20-25 heads/square meter.

The pellet feed in the seedling stage requires crude protein ≥45% and fat ≥8%; in the adult fish breeding period, the crude protein of the feed is ≥32% and the fat is ≥6%. Feed at 6:00, 10:00 and 17:00 every day. Observe the fish's food intake and master the daily food intake. The general food intake rate in the seedling stage is 4% to 5%, and the food intake rate in the adult fish breeding period is 3% to 4%. After 12-15 months of breeding, when the body size reaches more than 500 grams per tail, it can be put on the market.

Pay attention to water quality control, regularly monitor various water quality indicators, control dissolved oxygen above 6 mg/L, pH between 7.5 - 8.5, ammonia nitrogen < 0.5 mg/L, nitrite < 0.1 mg/L, and focus on water quality. Probiotics such as lactic acid bacteria, bacillus, and photosynthetic bacteria are often dispersed. The water quality should be rich, active, tender, and cool to promote the healthy growth of freshwater cod.

In daily management, dissolved oxygen should be maintained above 6 mg/l. In the breeding process, disease prevention and control must adhere to the principle of "prevention first, prevention and control combined". Water quality management and disinfection of breeding ponds should be done well every day to avoid illness caused by human infection. Accurate feeding management is the key to successful breeding. Feeding must follow the principle of "timing, fixed point, quantitative, excellent bending and hidden quality improvement" to feed in time.

The above are the key points about the breeding technology of adult freshwater cod. They are provided for your reference and learning. We hope they are helpful to you. Please forgive us for any shortcomings.

During the breeding process, attention should be paid to water quality. The water source should be changed regularly, and the oxygen in the water should be kept sufficient. Very nutritious feed should be fed, diseases should be prevented in time, and the fish should be cleaned regularly.

Pay attention to the breeding density and choose high-quality fish fry. During the breeding process, you must pay attention to timely replacement of water resources to ensure the fertility and nutrients of the water. Pay attention to the combination of feed. Relatives must have particularly strong basic theoretical knowledge and can learn from people around them.

When planting any crop, the quality of the variety will affect the yield and quality, so when planting sorghum, you should choose high-quality and high-yield varieties with high yield, good quality, wide adaptability, and strong resistance to stress. Good varieties have high yield, good quality, strong adaptability, disease resistance, resistance to natural disasters, and resistance to flooding, which have incomparable advantages in crop production.

2. What nutrients are best for brain development for 3-year-old babies?

Many parents are very concerned about their baby's brain development and hope that their baby will be smarter, so they will prepare a lot of nutrients that are good for brain development in daily life, but this is not necessary. Because the baby's intelligence has been basically determined since birth, unless there is a major change that will cause the intelligence to decline, otherwise at least it will not change to a large extent. However, we can let the baby absorb some nutrients in daily life to make the whole brain function better.

1. Walnut oil

The biggest function of walnut oil is that it can promote brain development. In fact, from a scientific point of view, any oil can be eaten, whether it is walnut oil, tea oil or rice bran oil, these are all healthy concepts, and the same is true for soybean oil and peanut oil. Therefore, only a single type of oil should be eaten in the child's diet, and a reasonable combination should be made. However, it should be noted that walnut oil is a low-temperature oil, so it is only suitable for cold dishes, not for cooking. Be sure to pay attention to the cooking method to avoid the loss of nutrients.

2. Cod

Strictly speaking, cod is a deep-sea fish. It is rich in DHA, which is a good nutrient for the baby's brain. Therefore, eating cod often can promote brain development. However, this kind of cod is not the common cod on the market, which costs more than ten yuan per pound. Most of them are farmed cod rather than deep-sea cod. Due to the increasingly serious marine pollution in recent years, the price of deep-sea cod has also risen. Often, cod of about 200 to 300 grams is sold at a price of about 200 yuan, which is a normal price. If the family can afford it, they should let their children eat it 1 to 2 times a week, whether it is steamed or fried.

In order to promote brain development, in addition to providing the baby with balanced nutrition, we must also make sure that he gets enough sleep, because only with enough sleep can growth hormone be secreted and the brain and body can develop better.

Supplement iron, calcium, aluminum, magnesium, protein, dietary fiber, and minerals. Pay attention to a reasonable combination of dietary structure, eat more nutritious foods, and ensure that children get enough sleep.

Supplementing vitamins, proteins, minerals, amino acids, and calcium content, these nutrients will help children's brain development.

3. How big can freshwater silver cod grow?

Freshwater silver cod is called big head and big scale. Commonly known as round head and cone head, it belongs to the Cyprinidae, subfamily Cyprinidae, and can grow to about 40 cm. Commonly known as round head, cone head, and big scale. Subfamily, genus Cyprinidae. Distributed in inland river basins of Uzbekistan, Iran, Turkey, etc. The body is fusiform, with a short head, a slender body, and a caudal fin. The back is silver-gray, the abdomen is silvery white, the body is covered with strange and shiny large scales, the mouth is sub-inferior, with a pair of snout barbels and maxillary barbels, a 2-chambered swim bladder, and the distance from the starting point of the dorsal fin to the snout tip is shorter than the distance to the base of the caudal fin.

There are two ecological types: upstream migratory type and landlocked type. The migratory species are mainly distributed in the southern Caspian Sea and the Aral Sea system, Uzbekistan's Chata, Iran and Turkey and other inland rivers. The length of the front fin of the big scales is greater than the length behind the dorsal fin. The length of the front dorsal fin of the short head spindle is less than the length behind the dorsal fin, and the head is relatively short.

Freshwater silver cod is called big head and big scale. Commonly known as round head and cone head, it belongs to the Cyprinidae and subfamily Cyprinidae, and can grow to about 40 cm.

This fish can grow to about 10 kilograms, requires very high water quality, and needs careful care when cultivated artificially.

Maximum body length 105 cm, maximum weight 15 kg