1. Parental choice is fundamental Self-use goldfish should pay attention to fattening from an early age, but should pay attention to spawning can not be too fertile before spawning, or pro-body postpartum easy to die. In order to cultivate juvenile fish, we must choose fish with long body length and obvious quality characteristics, dilute the water, change the water frequently, and feed well, and add appropriate additives to the bait to become full-price nutrition (but not for the slim goldfish like butterfly tail). fatten). During the fattening phase, the fish body is soaked twice with 0.5% sodium bicarbonate for 15-20 minutes each time, which is favorable for goldfish growth and fattening. After a year of cultivation, the fish can grow up to 13 cm in length and weigh up to 150 grams. It is mature, but due to its unstable genetic traits and spawning, it is generally not used for broodstock. The best breeding age is 2-3 years old. Not good. Whether it is a self-retained brood or a foreign species introduction, the pure goldfish with a clear and selective body size should be selected. For grass gold, dragon gold, and high head, the general vice characteristics are obvious. Other goldfish can use the caudal fin as a purebred indicator. The caudal fins are soft, thin, flat, and well-developed. Most of them are purebred species; caudal fins are tight, thick, weak, and non-uniform in development. 2, prenatal preparation is critical At the end of March and early May of each year, when the water temperature stabilizes at 15- 20 C, select the goldfish broodstock and divide it by the pool ratio of l:1 or 1:1.5. Only one or two tails of the precious species will be placed. , appropriate intensive care and nutrition. Spawning pool 1-2 square meters, square or round, the inner wall is smooth, pool color should not be shallow. After the breeding pond is cleaned and disinfected, fresh fresh water filtered with a 75-mesh filter is poured 25-30 cm deep and put on the disinfected brown tablets or plants. Prenatal broodstock is diluted in green water. 3, technical points to note when spawning In order to avoid mixing of goldfish species, different species of goldfish cannot be mixed in the same spawning pool. When the water temperature is stable at about 18cC (to prevent sudden changes in the weather, conditions can be bred in plastic greenhouses), (1) When breeding, fresh water will be flushed into the spawning pool, and the fish nest will be released in the afternoon. 1.5 into the pool. The next day from dawn to 10 o'clock, the male and female fish chase and spawn and fertilize in aquatic plants. If the first day of spawning is small. The next day may be due for production. When it is not produced the next day, the broodstock will be released and the broodstock cultivation pool will be released for a week. Note that when fish is released, use a spoon to grab the broodstock and gently lift it to prevent it from scratching the broodstock and post-partum infection. (2) The artificial reproduction of goldfish is more convenient and scientific with water insemination. The specific method of operation is: the large porcelain basin holds a proper amount of fresh water and aquatic plants. The two men hold the male and female broodstock in both hands. The reproductive pores are opposite. The thumb is gently squeezed on both sides of the testis of the male abdomen until the milky semen flows out. Gently squeezing the ovaries on both sides of the male's abdomen and producing the eggs. Eggs are activated by water and fertilized in the water. The artificial insemination method used during artificial insemination is similar to that of the “Four Homes†method, but with different doses, each female goldfish is injected with 60-120 micrograms of LRH-A, the male is halved, and the female is generally 8-20 hours after the injection. Fish spawn, male fish row fine. In the process of artificial insemination, sperm and eggs should be prevented from direct sunlight and shading with black umbrellas. Operators must coordinate with each other to ensure that the action is light and fast. Otherwise, the broodstock may be injured and cause post-partum death. 4, properly postpartum care, can reduce the death of broodstock. Postpartum broodstock is very tired, weak constitution, vulnerable to external fright and illness, if nursing care is not appropriate, broodstock mortality is extremely high, the author through practice in recent years, find out a set of measures to protect the broodstock, can greatly reduce post-parental fish mortality rate. The measures are as follows: Postpartum broodstock uses a dorsal fin base injection of sulfadiazine sodium + glucose, the amount of sulfadiazine sodium lmL tail / 100 grams weight, single fish single needle, for the natural hatching of broodstock, can be injected before sunrise on the second day of postpartum, artificial hatching The broodstock was injected immediately. Post-harvest broodstock stocking water, aerator oxygenation 4-6 hours / day, once a week. The color of stocking water is not easy to be dark, and the water depth is controlled at about 30-50cm. If the water body is darker, 30cm can also be used. This can effectively inhibit the sexual stimulation of broodstock and facilitate physical recovery. Postpartum broodstock feeding should not be immediately fed, otherwise it may cause indigestion and even death. On the second day after childbirth, one-third of the time for the normal dose, once a day, feeding time, in the morning 6-7, point. After the next day, depending on the activity of the broodstock, the amount of feeding can be appropriately increased. After one week, the broodstock water body is replaced and disinfected. The disinfectant can be used quicklime and avoid using drugs that have irritating odor. If there is a wounded physique, it can be removed and bathed with 3% saline for 5-10 minutes. Through the above measures, the quality of “Shen You†brand goldfish in Zhenping is guaranteed, and the survival rate of post-natal broodstock is greatly improved.
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