The rough work of carp fry is complicated, the replacement of part numbers, frequent replacement of nets, and busy work of sift fish.

In addition, there are relatively many diseases of fish, and the rough scale of fish fry is a key stage of goldfish culture.

Frying cage

Good seedlings are the basis for successful aquaculture, and gold carp farming is no exception. Buy healthy and strong golden carp seedlings, the fish seedlings grab fast, strong disease resistance, fewer diseases, high survival rate, grow faster, and good efficiency; the other hand, buy bad fry, fish do not rush to feed, feed The increase is slow, and the disease resistance is weak. When the environment changes, the fish are susceptible to disease, the survival rate is poor, the fish growth is slow, and the benefit is not good. Visible seed selection is related to the success or failure of golden mullet farming, can not be seriously taken.

The standard of healthy seedlings is uniform and tidy, the body surface is clean and the mucus is less, the color is bright, and there is no damage. How can we choose a good goldfish fry? The farmers can observe and compare the fry at the seedlings site. It is good for the seedlings to swim in the reversed water, to swiftly catch materials, and to be frightened.

The fry feeding time is chosen not to have a big cold wave southwards. In the small water period, sunny days with small winds and waves will be released sooner or later. Seed stocking density 50 to 80 / cubic meter. Choose to put seedlings in areas where the water flow is slow in the fish row to avoid adverse effects of flowing water on the fry.

Feed and Feed

Feed costs account for the vast majority of the cost of goldfish culture. Feed feeding is related to the breeding effect and benefits, and it is worth the attention of farmers. The quality of the feed is related to the health and growth of the fish. The selection of good quality, stable quality, and cost-effective feed is the guarantee for the success of goldfish culture. A good golden carp feed should be such that the size of the fish is uniform, with a clear fishy smell, a short softening time, and a good fish attracting food quickly.

Feeding time

Generally, it is recommended to feed water when there is no flow at stoppage or during micro-flowing water before and after the stoppage of water, so as to prevent the feed from being washed away by running water, and at the same time reduce the difficulty of feeding the fry and reduce the energy consumption of feeding.

Feeding frequency is generally fed 4 times to 6 times a day, and the number of young seedlings that have just returned is higher, and feeding is usually done 4 times after changing the net.

Feeding methods

First, a small amount of feeding, attracting most of the fish, and then a large number of feeding, until the fish do not rush to feed material to reduce the amount of feeding, generally feeding to 70% to 80% of the fish that is fed or fed to stop feeding. Minimize the time the feed stays in the water to reduce nutrient loss.

As the fry is fed at the nursery, it is powdered. The size of the fry that has just returned to the fish raft should be adjusted with the powder for 3 days to 5 days, and then gradually transitioned to the open material (0L). This is the transfer. (For fish of different specifications, the requirements for the feed ingredient number (particle size) are different. When changing the material number, it is necessary to gradually reduce the size of the small material, and gradually increase the feeding amount of the mixture of the large material, about 3 days to 5 days. It is to allow the fish to adapt and the smaller fish to eat. Similarly, No. 0 material is changed to No. 1, No. 1 material is changed to No. 2 material, etc. All of them require a refueling process.

After the net-changing for a period of time, some marine microorganisms and dust will be attached to the cage, blocking the mesh openings and affecting the smooth flow of water, resulting in poor water quality inside the cage. Nets and dirt that clogs the mesh can even provide a habitat for parasitic non-parasites, which infuse the fry with the potential to infect parasites. Therefore, the network should be changed according to the clogging of the mesh. In general, the 6th network should be changed once every 5th to 7th, and the one-inch network should be once every 10 days to 15 days. Staggering the time of network change can save the number of nets used.
Screening fish sub-seed gold carp standard generally need to screen the seedlings 2 times, and change the net work together, the size of the different specifications of the seed breeding. The first time the fish was sifted, about 20 days after the fish was returned, the fish was sieved using the second or 9th sieve, and the fish was placed in a 1-inch net. The second screening of fish is generally from 40 days to 50 days. Two-inch screens are used to screen the fish and the fish are screened and put into a 2-inch net. Screening the seedlings of fish is beneficial to the regularity of fish specifications, the equalization of fighting materials, the acceleration of long speeds, and the early entry of fish head into the large network, laying the foundation for early and batch fishing.
Feed storage management Golden mullet has a small amount of material at the initial stage of seedling release, and materials No. 0 and No. 1 may be stored for a long time. The storage condition of the fish platter is simple, and the South China region is currently in the rainy season. To prevent the feed from being wetted by the rain, moldy worms are formed. Such phenomenon, it is recommended that fish farmers do not store more than 5 days of storage, fish storage materials covered with canvas, etc., every day when the use of materials to check bags are wet, the priority use. Once the feed is found to be wet, wet, moldy, buggy, and odoriferous, it must not be used, and it is not worth the trouble that fish fry get diseases such as enteritis due to ingestion of deteriorating feed.

Disease prevention and treatment

Black body disease

The cause of the disease is unknown. Nerve necrosis virus, enteritis, and stress can all cause goldfish blackheads. The main manifestation of the disease is the black color of the fry body, swimming at the edge of the pond or cage, poor vitality, and gradually died.

Control methods:

(1) Choose a seedling farm with better sanitation and disinfection conditions, and choose healthy and lively fry.

(2) Proper zippering of the fry before transport to improve the anti-stress immunity of the fry, and at the same time adding anti-stress drugs such as vitamin C during the transportation process to reduce fish seedling damage.

(3) When the water temperature is above 24°C, there is no major cold wave southward, and when the weather is stable, the seedlings will enter again.

(4) Start feeding should be the same with the seedling field to avoid powder feeding in the seedling field. Immediately after returning seedlings, feed extruded prills. Overage period should be given, and amino acid multidimensional and other health medicines should be fed.

Benedeniasis

The farmers are commonly known as “white sesame seeds”. The trematode parasitic parasite Bennetia is adsorbed on the body surface and eats the epithelium, muscle, and blood of the fish. After the fish are stimulated, they madly rub against the nets, and the skin tissue is damaged and the immunity is reduced. , Viruses such as Vibrio vulgaris died of rot.

Control methods:

(1) Replace the clothing in time to remove the parasite's habitat. (2) Fresh water can also be added formalin or potassium permanganate medicinal bath.

Gold carp rotten body often occurs after parasites such as “white sesame” and is the main disease affecting the survival rate of goldfish fry in recent years.

Control measures:

(1) Reduce the density of culture and reduce the chance of mutual infection; (2) Early detection and early treatment of parasites, careful operation of screen-fish replacement, and reduction of fish seedling damage.

(3) Feeding with non-banned antibiotics such as florfenicol and multivitamins.

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