The yellow snapper, commonly known as Huang Gu, Huang Lading, and Acupuncture, is attached to the genus Odonata, Acipenser, and Smilax, and is mainly produced in the Yangtze River and its tributaries. It is a wild economic fish of our country, usually individuals at 30-100g. The largest individual can reach more than 250g. The fish is smooth and scaleless, with tender meat, delicious meat, rich nutrition, and no intermuscular spines. It is popular among consumers at home and abroad. It has always been considered as a high-grade fish with a large breeding prospect and a Great economic value. At present, the artificial propagation technology has matured, but the majority of farmers are plagued with the low survival rate of yellow snapper fry, which limits the further development and promotion of stingray aquaculture. How to increase the survival rate of yellow snapper is the problem that must be solved in the current stingray aquaculture. Through the summary of hair growth over the past few years, we believe that we should do our work from the following aspects, which will help increase the rate of hair growth.

1, the preparation of the pond

1.1 The choice of pond

The stingray hairpin pool should be selected in an area of ​​1-1.5 mu, the water depth can reach 1.5m, the pool slope ratio is 1:3 to 1:3.5, no leakage, no leaking, flat pool bottom, less silt ponds. Excessive area is not easy to control the quality of water, management, feeding, domestication is also very inconvenient, Chi Xiaopo is not too small than the stingray juvenile fish habitat.

1.2 Qingchi disinfection, water intake

After the pond is selected, 7-10 days prior to planting, the pool water is drained, thoroughly disinfected and cleared, and 10-15 kg of bleaching water per acre is poured into the water. Quanchiposa should be poured on the slope, including the slope of the pond, and the residue must not be left behind. Must be removed in the pool. After the pond is clear, dig a 2m2m0.5m pit at the bottom of the corner of the pond to prepare for the dry pool and catch fish species in the future. After the Qingchi, the wings can be filled with water. When entering the water, the water inlet should be filtered with a pocket made of 80 mesh sieve to prevent entry of enemy fish and wild eggs. The initial water intake can be 50-60cm, and it is not suitable to discuss deep, which is conducive to the cultivation of water quality and natural food organisms (mainly plankton), and gradually deepen the pool water after the fish fry in the pool.

1.3 Base fertilizer to cultivate natural food

In the natural situation, the feeding target of the stingray fry in the pool is 3cm in length, which are rotifers, nauplii, cladocerans, copepods, and benthic animals. Therefore, in the case of artificial breeding should follow its natural law, in the fish before the next pool must be enough base fertilizer to cultivate nutritious and palatable natural food, fish will be able to fully feed the next time the appropriate natural food bait, is conducive to improve the survival rate of fry . In order to ensure that the fish can get more full after the lower pool, in the fish tank before the next 3 days must also be Quanchiposa soy milk, per acre of the pool daily dry beans with 1-1.5kg soaked into a gruel Quanchiposa.

1.4 Holding Eggs

The stingray floriculture pond holds 2-3kg of freshwater per mu, and the egg-holding shrimp is placed in a cage made of polyethylene mesh cloth. After spawning, the larvae can directly enter the pool through the mesh, and the shrimps in each stage are just for The stingrays prey on the fish and help to promote the rapid and long fish. Postpartum broodstock and dead shrimp should be promptly removed to prevent excessive consumption of oxygen and water quality.

1.5 Planting aquatic plants

Stingrays are relatively dizzy and indifferent to their habits of inhabiting attachments. Therefore, a certain amount of water plants should be planted or transplanted in the hairpin pool, which is conducive to shading and inhabitation. Water and peanuts should be used as water peanuts, and shading and habitat effects should be good. Transplantation is also easy, but the transplanted area cannot exceed one fourth of the total surface area. Excess plants should be removed in time to prevent oxygen deficiency in the covered water surface. When weeds are transplanted, weeds should be cleaned to prevent the entry of predator organisms, wild fish and their eggs into the pond with aquatic plants. The washed plants should be thoroughly disinfected with potassium permanganate solution, and then transferred to the pool for fixation.

2, fry under the pool

2.1 Lower fish fry specifications

Due to the conditions of breeding units, the size of outsourcing fish fry is generally small. After buying the seedlings, they must first be fortified in small cement ponds or cages for 2-3 days. Specifications should be 1.2cm or more (preferably about 1.5cm). ) After releasing the flowers in the earthen pond, it will help improve the survival rate.

2.2 Lower Pool Method

The stingray seedlings should be selected at 9 o'clock in the morning at sunny day, because the temperature of the stingrays is high, and the temperature at 9 o'clock in the morning is still acceptable. The oxygen status of the water gradually improves, and the seedlings are conducive to the temperature of the seedlings. The adaptability of the environment is also strong. When seedlings are lowered, the seedlings must be opened and scattered so that they cannot be piled up. Otherwise, they will cause large-scale deaths, which will affect the survival rate of the flowers.

2.3 stocking density

The density of hairy floret is smaller than that of other conventional fishes. Generally, about 80000 seedlings can be stocked about 1.5cm per acre. However, if the density is too large, it will have a negative impact on the effect of hairflowers, and the management difficulty is also high. Will increase with it.

3, feeding and management

3.1 Feeding

After the fish fry under the pool, it is necessary to sprinkling soy milk in time to cultivate natural plankton, and at the same time insist on taking a certain amount of plankton to release the pond every day, especially to get a certain amount of rotifers, cladocera, and deficiencies of plankton in the original pond. The fry is always in a state where it can be fully fed and can grow rapidly. This work has been maintained for about a week.

3.2 Domestication

The fry can begin to acclimate after 3 days. Firstly, select about 10 feeding sites per acre for fixed-point feeding, use fish gills or turtle material, and squid material to form lumps. After 4 o'clock in the afternoon, invest in a feeding spot about 40 cm away from the water surface. After 4 days, reduce one feeding point, then reduce one feeding point every 3-4 days until the last two feeding points, build a good food table, and change it once a day for feeding twice. The food table must be about 40cm above the bottom of the water surface, which is conducive to the feeding of stingrays. The fry is finally domesticated into a concentrated food intake artificial compound feed, which is convenient for checking the fish's feeding conditions and preventing disease and treating diseases.

3.3 Water Quality Management

The water quality will be aged 4-5 days after the fry drop, and new water should be added in time. Each time about 10cm water is added, fresh water is added every 5-7 days. Every time you add water, you need to filter. If water quality is too light, you need to apply fertilizer in time to keep the quality of water and fertilizer cool, and ensure transparency at 25-30cm. Do a good job of oxygenation in time to prevent unnecessary loss due to lack of oxygen floating head.

3.4 Prevention and treatment of fish diseases

Stingrays are relatively weak at juvenile stage, and prevention should be the main focus for diseases. It is better to add broad-spectrum antibiotics or antibiotics to the feed during the feeding period. If it is found to be sick, it must be promptly diagnosed and promptly treated.

3.5 patrol pond

It is indispensable to inspect 2-3 times a day. Observe the water quality at each time. Fish activity status, feeding conditions, timely adjustment of daily feeding amount according to weather and feeding conditions, timely water injection, and oxygen increase. Remove bait, debris and excess water in a timely manner, and strictly control the excessive growth of aquatic plants.

3.6 points pool or sale

When the fish body grows to more than 3cm, it must be cultured or sold in a timely manner. Otherwise, it will affect the further growth of the fish body, which is not conducive to the cultivation of large-size fish species.

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