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First, artificial breeding
1. Breeding fish. Pond cultivation, starting in March each year, picking females 2nd to 3rd instar, male 1st to 2nd instar, male to female ratio 1:1.2 is preferred.
The top of the red genuine sarcoma sarcoma is selected, other irregularities such as yellow and white are generally not selected. The stocking density is smaller than that of commercial fish, and the amount of feeding increases gradually with the warming of the weather. It usually takes 1 month for the gonads to mature.
2. The choice of broodstock. In the first half of April, the gonads can be selected from the cultivating pool. The abdomen is soft and elastic, and the body is oval. The genital micro-infrared females are used as female parents. The bodybuilder, the cover-covered fins are full of star-chasing males as male parents.
3. Artificial labor. Artificial oxytocin is generally selected in mid-April, the water temperature is 25°C, disposable pectoral fin injection method. For each female 100 g, the luteinizing hormone-releasing hormone analogue (LRH-A2) is 1ug to 2ug and the male fish is halved. The injection time was chosen around midnight and the waiting time was 18 hours to 20 hours.
4. Artificial insemination and incubation. In the evening, observe and observe that when a male fish is found to be in a fierce pursuit of the female, the male and female fish are immediately caught in a pot filled with water and checked, and the squeezing of abdomen with milky white mucous or yellow eggs can be performed to perform artificial insemination. One person's left hand grasps the female's head and trunk, and the right thumb and index finger gently squeeze the abdomen, and the extruded fish eggs are evenly discharged into the sterile magnetic basin (a small amount of saline at 25° C. is previously added into the basin). Squeezing males quickly. One person dipped in physiological saline with a cotton ball to disinfect the broodstock, and at the same time dried water droplets on the operator's hand. Stir with feathers for 1 minute. Sprinkle the fertilized eggs evenly in the hatchery with the ovary.
During incubation, the use of clean, non-polluting water requires adequate dissolved oxygen and a pH of 7.5 to 8.0. The membrane can be hatched at a temperature of 25°C for 3 days to 4 days. During this period, it is mainly to prevent saprophytic diseases, splashing preventive drug solution into the pool every day, and paying attention to the fresh water.
Second, the seedlings bred freshly hatched fish by absorbing their own yolk. After 4 days, use two layers of 25# plankton nets to pour the cooked eggs and pat it gently on the water so that the egg yolks are uniformly suspended in the mist. Water. Feed once a day, the feeding amount is 1 hour to 1.5 hours after eating, after 8 days, when the fish grows to more than 1cm, the swimming is enhanced, the small plankton feeds, and when it grows to 3cm, it is changed every week. Once in water, feed some fish food.
Third, discuss the advantages of artificial insemination. The use of artificial insemination can greatly reduce the physical consumption of the broodstock after 8 hours to 10 hours of chase, and reduce the death of broodstock. Practice has shown that the survival rate of postpartum broodstock is increased from 50% to 75% of natural mating to more than 95%, and natural mating and fertilization The rate is generally not more than 40%, and the artificial fertilization rate can reach more than 80%. At the same time, it can also ensure that the varieties are pure.
Precautions. Fish nests should be suspended in the middle and upper layers of the water, and the weights can be tied on both sides. The upper layer is suspended and fixed in the hatching pool. If the fish nests surface, the fertilized eggs will be exposed to the sun and they will sink to the bottom of the water. Big suffocation. During hatching, the eggs must not be tampered with, as this will reduce the hatching rate and cause gems.
The Artificial Breeding and Seed Breeding Techniques of Crane Top Red
The crane-top red is a typical representative of the goldfish culture. It is beautiful and agile, giving people a feeling of freshness and brightness. The whole body of silver-white scales glitters with a red sarcoma on the top of the head. It has a unique red and white appearance, and it is attractive and moving. Like cranes flying wings.