Fish Feed Machine Knowleagde

1. Choose good fish species
Feeding catfish should maintain good water quality, and start fertilizing the water quality a week before the fish ponds are disinfected and stocked. Some water floating lotus can be planted on the water surface to play a role in shading, preventing escape and regulating water quality. The pool water must be replaced frequently, generally 1/3 of the pool water must be replaced within 10-15 days. The changes in the water quality of the pool should be observed frequently. Generally, the water quality should be yellow-green. If fish fry are found escaping from the water surface, it means that the pond water is too fertile and the water is lack of oxygen, and new water should be injected in time to drain the old water. Especially in sweltering hot or thunderstorm weather, pay attention to frequent injection of fresh water to increase oxygen in time. If possible, an aerator can be installed to increase oxygen to prevent fish from dying. After the water injection reaches 0.9 meters, the biogas residue can be used as the base fertilizer for the fish pond, and the biogas residue can be put into about 250 grams per square meter of the fish pond.

When there are a large number of rotifers in the pool, put catfish fry into them. The fry should be free from injury, disease, and healthy. The size of the fry should be more than 3 cm, and the size should be as consistent as possible to avoid killing each other. When the fry are put in, disinfect the body of the fish. Dilute 1 kg of salt with 30 kg of water and soak the fry in salt water for 5 minutes before placing the fry. A small amount of pool water can be put into a container before the seedlings are released, and a few fry can be put into trial breeding. If the fry live normally within a day, you can put the fry into the fish pond. The stocking time is suitable in sunny days, and usually 6,000 to 10,000 catfish fry of 3 cm long are stocked per mu. Every 2 to 3 days, add new water once, and then apply a small amount of fertilizer.

2. Feed the bait scientifically
The newly hatched fry rely entirely on their own egg yolk as nourishment. The yolk gradually disappears in about 2 days. When the larvae can swim normally horizontally, they can go to the pond to eat. Fry open feed can use cooked egg yolk or small cladocerans and copepods plankton.
Boil the egg, remove the shell, take the egg yolk and wrap it with gauze, squeeze the egg yolk in a dish filled with water, make it form egg yolk particles, and splash the water slurry in the whole pool.
As the fish grows up, they can be fed with water fleas, mosquito larvae, earthworms, fly maggots and various small family fry, or fed with silkworm pupa meal, pig blood, artificial seedling compound feed, etc. It is advisable to have a little bit of bait left in the pond before the next feeding amount, so as to prevent the fry from feeding on each other due to insufficient feeding.
The fry that has just been transported has weak resistance and different specifications. If they are directly put into a large pond, the fry will have a large range of activity, a lot of physical exertion, and the bait put in is difficult to eat for a while, resulting in wasted. Will pollute water quality. It can be intensively raised in the small pond first, and then raised in the big pond. This is not only easy to manage, but also allows the fry to better adapt to the new environment, and it is easy to get enough food in the small pond to promote their rapid growth. When the catfish fry has grown to 5-7 cm in length, it is necessary to grasp the food and feed the artificial bait. The protein content in the feed reaches more than 45%. The fish species of different specifications are separated by pulling the net to avoid mutual food.
When the fry cultivated in the small pond reaches about 10~15 cm, the large fish species can be selected from the pond and put into the large pond to raise, and the small fish species are still kept
in the small pond for intensive cultivation to balance the growth of the fish species. The specifications are consistent to avoid the phenomenon of big fish eating small fish, thereby
effectively improving the survival rate and unit yield of fry.
Catfish is an omnivorous fish and is bulimia. Therefore, it is necessary to correctly control the feeding amount to ensure that there are as many fish in the pond as many feeds as possible to prevent
blind feeding. At the same time, it is necessary to implement divided feeding, spread the bait evenly, eat a small amount of food, and feed enough to prevent the phenomenon of polarization due to uneven hunger and satiety. At the same time, in the initial stage of fry cultivation, animal feed should be the mainstay for intensive cultivation. As the fish grows, some plant feeds should be gradually switched to combine animal and plant feeds. The daily feeding amount should be controlled at about 5% to 8% of the total weight of the fish, and the feeding amount must be adjusted every 1 week or half a month to make the feeding amount more reasonable.

Feeding should be regular, feeding at regular intervals every day, once in the morning and afternoon; the second is quantitative, each feeding amount should be eaten 3 to 4 hours after feeding, and the daily feeding amount is about the total weight of the fish in the pond. About 5%, depending on the weather and fish ingestion conditions, increase or decrease appropriately.

3. Strengthen breeding management
The prosperous period of catfish reproduction is between March and May, and the middle and northern part are slower than the southern part by about one month. First select the mature female and male species. Each group selects 3 female fish and 1 male fish respectively and puts them in each group. Group of cloth buckets in the net.
Female catfish are easy to distinguish during the breeding period. At this time, the female fish's abdomen is enlarged and soft, the genital pores are round and swollen, and the anus is not concave. Lightly pressing the abdomen with fingers will cause light yellow eggs to be discharged.The male fish is slender, with a flat lower abdomen, narrow and long genital openings, and the pectoral fins are usually larger than those of females of the same body length. If you press lightly with your fingers, the mature fish will discharge a small amount of white semen.
Touch with your hands before collecting the eggs, check the softness of the female abdomen and gently squeeze it. If there is egg production, the dry guide method is used to collect the eggs; if there is no egg production, wait for a period of time before proceeding. an examination.
First catch the female fish that can ovulate. One person wraps her abdomen with gauze and faces the genital opening to the porcelain or container for egg collection. The container must be clean and water-free. The other person catches the female fish’s tail and gently squeezes it toward the anus.
When pressed, the eggs are slowly squeezed out into the container.
Pour in the prepared sperm suspension, stir with feathers, and add clean water to wash away the excess sperm. Insemination is completed after several times. The fertilized egg is spherical, greenish-yellow, with a little red spot, and has a diameter of 1.65 to 1.8 mm.
The fertilized egg is not sticky at first, and it will become sticky after about 20 minutes. The fertilized egg should be spread on the attached egg sheet before it becomes sticky. Generally, materials such as screens and nets can be used to attach and gently stir with feathers to make the fertilized egg Evenly attached, if the egg particles are attached too densely, it will affect the hatching rate.

4. Strengthen epidemic prevention and control
Viral fin rot disease is the most harmful. It usually occurs when the fry weighs about 50 grams after one month of stocking. Blisters appeared on the body surface of the sick fish, the fin base was congested, rotted, severe ulcers appeared throughout the body, and a large number of dead fish appeared until the entire army was destroyed. You can use 10,000 units of bleaching powder liquid to splash the whole pool.
For parasitic diseases, 4 thousand units of crystal trichlorfon or 0.6-0.7 thousand units of copper sulfate and ferrous sulfate mixture 5:2 can be sprayed in the whole pond.
Enteritis disease persists in not feeding mildew and rotten feed. Regularly add 0.05% to 0.1% fresh garlic juice to the feed, and add 20 to 100 grams of oxytetracycline powder to every 100 kg of feed
for 5 to 7 days.
Black body disease The diseased fish body becomes black, thin, and stops eating. In severe cases, the fish body often hangs its head upwards and hangs on the surface of the water until death. Upon inspection, there is a round red blood spot on the inner side of the pectoral fin, the fin rays are ulcerated, and mold spots appear on the back of the head. This disease is susceptible to infection at the fry stage, and the disease is most likely to occur if the food is insufficient and the water quality is not good. The onset is rapid, and the infection is rapid. The water quality should be kept clean and unfermented fertilizers should not be used. Sprinkle 2 to 4 grams per cubic meter of gall and 30 grams per liter of quicklime water in the whole pond, once every other day, 2-3 times.
The fish with air bubble disease floats on the surface of the water, the abdomen is up to the sky, and there is a bubble in the abdomen, which cannot sink. The main reason is that too many unfermented organic fertilizers are used in the pond, or the water quality in the pond is aging, there are too many blue and green algae in the water, the gas in the water is too saturated under strong light, and the fish eat bubbles by mistake. If the transparency of the pool water is too small, it is not suitable to put fish fry; after the disease occurs, quickly inject new water and throw in sufficient live bait, which can make some of the fry discharge bubbles and return to normal; for each water depth of 1 meter, use 1.5 to 2 kg of salt for the whole pond. Splashing has a certain effect.