The loach is a kind of fish we are familiar with, it is also a high value of small fish, loach breeding has an important significance and economic benefits, in the breeding process, the cultivation of loach seedling plays a key role, then, how to cultivate loach seedling? Here is a look at the loach seedling cultivation technology. First, the loach breeding 1, the parent fish to strengthen the cultivation. ① Cultivation pool conditions. Area of 300-1333 square meters, quiet environment, fresh water pollution-free, transparency of about 15 cm, water depth of 0.5 meters, silt depth of about 10 cm. Pool ridge slope is gentle, do a good job of preventing damage, escape prevention and other work. ② Intensive cultivation. In order to make the development of the parent fish mature and synchronized, the parent fish should be intensively cultivated. Male and female parents are cultivated separately, stocking density 0.5 kg / square meter. Fertilize the water quality before the parents come down to the pool, cultivate a large number of red worms and other zooplankton, as auxiliary bait. Feed carp feed, 7:30, 11:00, 16:30 once a day, respectively, 30%, 40%, 30% of the daily feeding amount. The daily feeding amount was about 7% of the body weight of the parent fish. Half an hour after feeding, use a long-handled dense plunge net to check the eating situation, and then increase or decrease appropriately. Cultivate continuously for about 30 days to check and select. 2. Artificial reproduction. ①Parent fish selection. Use the dense net to pull up the net to catch, usually in the afternoon around 4:00. Select the parent fish with strong body, powerful swimming, no disease or injury, female fish should have swollen abdomen, white and no spots, and its width is obviously more than the back: male fish should be selected by gently squeezing the abdomen with the thumb and forefinger from front to back, and there will be white semen flowing out. Male to female ratio (5-6): 1, the two are still separate with a dense net hanging in the clear water pond, ready for artificial insemination. ② Artificial reproduction. Artificial insemination: oxytocics for chorionic gonadotropin (HCG) with a No. 4 needle for a one-time injection, the dose of 20 units / g, halved for males, 0.15 ml per tail injection, injection depth of 0.3-0.4 mm. Oxytocics were diluted with 0.75% Nacl solution accordingly to the injected dose and volume. The fish were wrapped in wrung-out gauze to prevent slippage and injected dorsally intramuscularly. The parents were then still separated and suspended in water with a dense net (www.nczfj.com), while a water pump was used to fill the net with water causing running water stimulation for the parents inside the net. The effect time is 8-12 hours when the water temperature is 27-25℃. Artificial insemination: dry the fish with dry gauze before operation. Kill the male fish to take the sperm nest and place it on ice in a petri dish, add a small amount of 0.75% NaCl solution, protected from light with curved scissors to cut up the spare, the female fish with the forefinger and thumb from front to back several times repeatedly squeeze the abdomen, squeeze the eggs in a dry and clean petri dish, in accordance with the above parental selection of the ratio of male and female artificial insemination is carried out immediately. Diluted with 0.75% NaCl semen and eggs mixed thoroughly, poured into the ice tray (commercially available, length, width and height of 40 cm, 30 cm, 10 cm), add aeration well water or tap water, quickly shaking to make the eggs evenly dispersed, and then left to stand for 30 seconds, pour off the water, and then add the new water as described above, placed in a ventilated indoor or shed on the framework of the morning and evening every day to change the water, 25 ℃, when Seedlings can be emerged in 32 hours. Each ice tray can hatch 6000-10000 fertilized eggs. Second, artificial cultivation of loach fry loach, juvenile stage compared with other fish individuals smaller and have external gill structure, the shape and juvenile or adult body is a big difference, resistance to disease is relatively weak, the general survival rate is low. By effectively controlling the environmental conditions, we can safely go through the physiological process of external gill to internal gill and improve the survival rate. 1. Fry cultivation. Fry can be opened to feed 2 days after hatching, with ice tray fry for cultivation, each 5000 tails, the first 2 days of feeding egg yolk, and then switch to fresh, boiled minced fish, 80 mesh sieve silk filtration. The daily feeding amount is about 10 grams per 10,000 tails, diluted and evenly sprinkled, once in the morning (9:00-10:00), once in the afternoon (4:00-6:00), whichever is eaten within 1 hour, at this time, you can see that the intestinal tubes of the fry are full of white food. Each feeding 1 hour and then change 80% of the water (fry have wall habit, water change is convenient). After 7-10 days of cultivation, at this time the fish fry body color golden, body length close to 1 cm, the body is stronger, you can collect the seed counting to transfer to the pool for the cultivation of young fish. 2, baby fish cultivation. Pond area of about 300 square meters, draw off the silt. Sterilize the pond 8 days before releasing the fry, apply bottom fertilizer, inject water to a depth of 40 cm, and cultivate plankton. Fry in the pond when the number of small water fleas reached its peak, per square meter stocking amount of about 2,000 tails, 2-3 days after feeding carp fish artificial feed, the first 10 days per square meter per day 50 grams, and then the daily feeding amount of 5% -8% of the total weight of the fish. Early, middle and late feeding according to the daily feeding amount of 30%, 40%, 30% of each feeding, after 30-40 days of cultivation, transformed into juvenile fish, at this time can be divided into ponds for large-size fry cultivation or adult fish breeding. 3、Feeding management. (1) loach in the child, young fish stage can be the size of each other, the feed must be cast enough, feed evenly. Juvenile fish cultivation stage with the growth of fish, regularly drain away some of the old water, refill new water, keep the pond water about 40 centimeters. ② Pond cleaning and disinfection should be thorough, the water temperature should be controlled at 25% and above, to prevent the external gills of young and juvenile fish from being infected with water mold. Inlet and outlet encrypted net device to prevent hostile organisms from entering the pool. Through the above introduction of loach seedling cultivation technology, we now know how to cultivate loach seedling, loach is known as? The loach is known as the ginseng in the water. , living in the lake pool, is a high nutritional value of a fish, it is not the same as other fish, whether the appearance, body shape, habits are different, is a special loach.