Loach meat is delicate and delicious, with high nutritional and medicinal value. It is an excellent economic fish with a promising future. Its artificial propagation and breeding techniques are described below:
First, artificial breeding
1. Sources and choices of intimacy. Intimate fishing can be taken from the ditch or to the bazaar. The selection criteria are: more than 2 years old, good shape, normal color, no injuries. The females were selected to be 15 cm in length and 30 g in body weight. The abdomen was enlarged and soft, and there was an outflow of eggs from the abdomen; the males were slightly smaller than the females, and the milky white semen flowed from the abdomen. Male to female ratio 1:3.
2, oxytocin and hatching. The urine production is carried out in cement ponds with an area of â€‹â€‹5 square meters, a depth of 0.8 meters and an injection depth of 0.3 meters. The water is the exposed well water and the water temperature is controlled at 23-25Â°C. The ovary is set in the spawning pool and made of brown skin or water boiled in boiling water. The spawning ovary is fixed in the middle of the spawning pool. The oxytocin drug uses chorionic gonadotropin (HCG), which uses 1,000 international units per female cockroach and halve the dose of the male cockroach. The liquid injection volume is 0.1-0.2 ml. A 1 ml syringe and a fourth needle were used for back muscle injection. The depth of the needle is 0.2-0.3 cm, and the needle is slanted forward at an angle of 45 degrees with the body axis. About 10-15 hours after the injection of the drug, estrus occurs.
Incubation adopts the hydrostatic incubation method, but during hatching, it is necessary to constantly change the water and change the water twice a day. The temperature difference does not exceed 1-2Â°C. The hatchery pool is a cement pool with an area of â€‹â€‹5 square meters. The hatchery pond is 0.8-1 meter deep and 0.3-0.4 meters deep. The water is the well-water after exposure and the water temperature is maintained at 23-25Â°C. Hatching and laying density is about 4000 grains per square meter. During the hatching, cover the sun above the hatchery to prevent fish from becoming deformed. In the case of rainy days, 1% malachite green solution should be used for disinfection to prevent parasitic watery mildew.
Second, seed cultivation
Fertilized eggs hatch at 2-3 days at 23-25Â°C. After hatching, the seedlings are incubated in hatchery ponds at a density of 3000 per square meter. Three days after hatching, the seedlings began to eat. At this time, the egg yolk could be fed. One yolk was used per 100,000 seedlings per day, and each feed was limited to one hour. Two to three days later, fresh leeches and rotifers were changed. After about 10 days, when the seedlings grow to 1 cm, they will be transferred to seedling ponds for cultivation, or cultivated directly from the hatching ponds until the seedlings grow to 3 cm and then transferred to the breeding pool.
The breeding pond is a concrete pool with an area of â€‹â€‹10 square meters, a depth of 0.8 meters and an injection depth of 0.3 meters. Before disinfecting the lower pool, disinfect the clear pool. The method is: first discharge the pool water to only 0.1 meters, then press 200 kg/667 square meters (1 mus) with the amount of calcined water Quanchiposa, and then fill the water to the highest water level. 7-10 days after the seedlings are released. The stocking amount is 2000 pigs per square meter. Within half a month after planting, powdered compound feed (feed formula: 50% dry bristles, 30% fish meal, 10% wheat flour, and 10% pig blood meal) was fed and gradually incorporated into the plant feed. Feed 3 times a day, 8 o'clock in the morning, 2 o'clock in noon, and 5 o'clock in the afternoon. The amount of feeding is about 8-10% of the body weight. The proportion of the 3 feedings was 50%, 30%, and 20%. At the same time, attention should be paid to changes in water quality. In summer, the shallow water in the pool should be warm, and water should be changed frequently. When the species grows to about 10 cm, it is transferred to the breeding stage.
Third, adult breeding
Muddy adult fish farming can be divided into cement pools and earth-building ponds. Cement pool area of â€‹â€‹10 square meters, the pool depth of 0.8-1 meters, the bottom of the pool mat humus 0.2 meters, 0.2-0.3 meters of water injection. Before the stocking, the clearing pond must be disinfected. The method is the same as breeding ponds. The stocking rate is 1000 tails per square meter. The soil pool pool wall shall be reinforced with prefabricated panels. The bank embankment shall be 0.8m above the water surface, and the embankment shall be 0.8-1m wide. The bottom of the pool shall be compacted with triple soil, 0.2-0.3 m of padding humus soil, 50 m2 in area and 0.3-0.3 water-injection. 0.4 m. Before the stocking, the clearing pond must be disinfected. The method is the same as the breeding pond disinfection method. The stocking amount is 600-800 per square meter. In the soil-building pool, 1 week before the earthworms were introduced, the amount of 2-3 kg per 10 m2 was used to pile up livestock manure and fertilize the water and cultivate food organisms.
Feed can be fed rice bran, fishmeal, minced animal viscera and bran, bean cake, bean dregs, pig blood meal, etc., and can also be fed directly with full-priced food. The formulas used in our experiments were: 50% wheat flour, 20% soybean cake powder, 10% rice bran powder, 10% fish meal, 7% blood meal, and 3% yeast powder. With the bait, add water, mix and knead into a soft block and put it on the water table. The amount of feeding should vary according to the weather and season. The general amount of bait is 5-8% of the total weight of the carcass and 10% during the peak season. Daily feeding 2 times, 7-8 am, 4-5 pm each feeding, the amount of feed in the morning, accounting for about 60-70% of the daily feed. At the same time, it also depends on the fish's food situation to flexibly control the amount of investment. Frequent cleaning of the food station during the breeding period will prevent water quality from deteriorating. In the summer, it is necessary to change the water once a day, each time changing 1/2. Also regularly sprinkle quicklime 1.5-2 mg/l, or bleach 0.1 mg/l.
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