Physiologically there is a peculiar phenomenon in the breeding of jaundice, which is hermaphroditism and sexual reversal, that is, in the absence of external factors, jaundice can change from female to male. In other words, from the embryonic stage to sexual maturity are all females. After the females lay eggs, the ovaries become gradual. Later, life exists as a male. There is only one spawning season in one year and it is a type of spawning once a year under natural conditions. The reproductive season of Astragalus is from April to September, and from June to August. In August, Hubei entered the period of high-yielding jaundice, and Guangdong entered a period of prolific breeding about half a month earlier. Astragalus has a small amount of eggs and the absolute amount of eggs is generally 300 to 800 capsules. The absolute fecundity of an individual increases with body length. When the total length is about 20 cm, the amount of fleshy eggs is about 200 to 400 grains. When the total length is about 50 cm, it is about 500 to 1000 grains. The mature eggs are golden yellow, with a greater specific gravity than water and no stickiness. The egg diameter is between 3.8 mm and 4 mm. After swelling, the water expands to 4 mm to 5 mm. The egg membrane is translucent. The yolk sac is pale yellow with many oil balls inside. Astragalus oxytocin-releasing hormone analogue A (LHRH-A) is used as an oxytocin drug. The injection dose depends on the size of the broodstock. 20 g to 60 g of females are injected with 8 micrograms to 13 micrograms per side and 60 grams to 250 grams. The females were injected with 10 μg to 20 μg per tail. Males were injected again 24 hours after injection of females. When the water temperature is around 25°C, about 40 hours after the injection of the female lice, the examination starts and every 3 hours. Effect time: 48 hours; 80 hours or so. Check the method: catch the skull, touch the abdomen by hand, and move from the front to the back, if you feel the eggs have been free, it indicates that ovulation, artificial insemination should be carried out immediately. At this point testicular generally blackish black. The proportion of eggs of Astragalus is greater than that of water. Under natural conditions, the fertilized eggs spit out of the foam and float on the water to hatch and emerge. When breeding artificially, the water quality is also liable to deteriorate because of the inability to obtain such foams that make the eggs not sink to the bottom of the water, and the fertilization rate and hatchability are low. Drip hatching, substrate sanding and other methods can be used. The fertilization rate and hatching rate can be greatly increased, but it can not reach the fertilization rate and hatching rate under natural conditions. This also shows that the male ferret vomits out to suspend the fertilized egg hatching. The bubble has a number of special features. The fertilization of Astragalus is hatched at a water temperature of 28°C to 30°C for 140 days. Artificial incubation The fertilized culture vessel was incubated in calm water at a light and bright place for about 2 hours, changed water 3 times, and sucked off eggs and unfertilized eggs with a pipette (no eggs were found after hatching). During this period, the temperature of the water is between 23°C and 27°C. The activity of water mildew can be controlled by malachite green (2 mg/L for 25 min to 60 min for the treatment of fish eggs). Here I recommend you to use an indoor hatching method, sand laying on the substrate, waterproof mold and a high hatching hatching method - water hatching. The specific operation is: one day in advance at the bottom of a large washing pool is washed with a layer of washed sand, sunlight exposure of fine sand, tapping the various levels of small tubes from the faucet, with the clip folder holding outlet, To control the drip rate. Transfer the fertilized eggs to a culture vessel covered with fine sand, turn on the faucet, and adjust the speed of the moving clamp to the water droplets at 10 drops/sec. This water droplet speed was maintained for one day, adjusted to 15 to 20 drops/second on the second and third days, and adjusted to 30 drops/second after the fourth day, and the titer was appropriately increased according to the situation until the hatchlings were hatched. (To be continued)