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Golden Stork and Rainbow Gills Photoperiodic Mature Four Seasons Breeding Technology
Shen Xishun Wang Zhaoming (Beijing Shunhong Rainbow Trout Culture Center, Huairou 101400) Screen Commentary 1. Incubation Room White juvenile pond The golden plover and rainbow trout swim and feed. The fish farmer feeds the bait. General Manager Shen Xishun introduced the visitors. Goldfish and rainbow trout are cold-water fish that spawn every year from November to February in the cold season of the second year. It only breeds once a year. The time for providing seedlings is concentrated from winter to early spring, which can not meet the demand of seedlings for breeding families throughout the year. In order to solve this problem, Shuntong Rainbow Trout Culture Center developed new technologies for the production of seedlings and breeding of golden pheasant and rainbow trout all year round according to the foreign technical experience and the biological characteristics of golden pheasant and rainbow trout. The promotion of the development of the goldfish and rainbow trout aquaculture industry. Second, outdoor broodstock. National squid good breeding field characters. Goldfish and rainbow trout swim in the pond and feed. The fish farmer feeds the bait. The egg cells of the golden pheasant and rainbow trout are about 1 mm of primordial germ cells before August. After August, as the daylight hours shortened and the water temperature decreased day by day, the primordial germ cells gradually grew up, and in the winter, they developed into eggs having a diameter of 4 to 6 mm and capable of fertilization and breeding eggs. This phenomenon suggests to people that the change of the length of light can restrict the development of germ cells. According to this revelation, after many years of experimental research, we have finally developed techniques for controlling the development of germ cells by adjusting the light time and promoting the maturation and reproduction of fish in the seasons that people demand. It is customary to call this technology an optically controlled mature technology. Using this technology, the golden pheasant and rainbow trout that can only be bred from winter to early spring can also be bred in late spring or in summer and autumn, realizing the production targets for the production of seedlings in all seasons. Third, the large white stainless steel sink on the steel frame. There are about 20 gold oysters in the trough, and 4 bred broughers on the side of the trough. The black shading curtain is placed on the fish trough. In early March, the daily sunshine time is about 10 hours. From then on, the sunshine hours will gradually increase. At this time around 3 o'clock in the afternoon, shade cloth was used to cover the pro-fish pond, which shortened the illumination time to 6 to 8 hours. The brooders entered the short-day sunshine period in advance. With the arrival of short-day sunshine, the gonadal advances into the development period, so that the broodstock that should have entered mature period after November will be able to mature and mature as early as September. Fourth, the exterior of the large white trough sink is erected with two wooden sides, and a 40-watt fluorescent lamp is installed under the wooden side. In the trough, gold and rainbow trout exchange games. It was already dark. A fish farmer turned on the power and the fluorescent light came on. The water flooded the waves and the golden eagle danced. When I entered the fall in September, the daily sunshine time was about 11 hours a day. Since then, the sunshine time will be shortened day by day. Under the daily sunshine conditions that shorten day by day, the broodstock will mature and spawn before and after December. If from September onwards, lighting is illuminated with light after a dark day, and the duration of illumination is extended from 11 hours to 17 hours, then the development of gonads will be prevented due to the extension of the illumination time. After the nighttime light continued to reach March of the following year, artificial light was stopped and the daily sunshine duration was shortened to 8 hours by shading. Under short-day stimulation, the gonads began to develop again. This should have matured broodstock around December, and its maturation and breeding season will be delayed until June to July. People can get summer seedlings. Fifth, outdoor broodstock. Four to five fish aquarists in the pool are selecting broodstock that can be used for artificial egg collection. After the bred fish that have been treated with light have entered the mature period, they must continue to reproduce artificially. Now fish farmers are carefully selecting broodstock that can be artificially propagated. The broodstock that can pick eggs and collect sperm are placed in small cages. Six, outdoor broodstock. A large parasol is supported by the pool. Under the shade of an umbrella, in a fish pond, a fish apologist holds a net for picking eggs, another fish aficionist holds the broodstock in one hand, and the other hand squeezes the abdomen of the fish. The large oocytes of the soybeans are squeezed into the omelet net. Pots. The person holding the net basin rinses the eggs with isotonic solution and then pours the eggs into the insemination pot. Illumination affects the survival rate of fertilized eggs, and egg collection and artificial insemination work are performed under shading conditions. If you pick up eggs outdoors, you must hold up a large umbrella to shading. Under the shade of the umbrella, squeeze the mature eggs into the egg-bowl using the method of squeezing the abdomen. Wash the eggs with isotonic solution to remove the dirt that affects the fertilization, and then pour the eggs into the insemination pots. 7. Another fisherman squeezes semen into the insemination pot. The egg and essence are mixed by hand and the water is poured into the pot. At this time, the male fish's semen should be squeezed into the insemination pot, and the eggs and essence should be mixed well and then poured into clean water. Eggs and sperm were combined into fertilized eggs in clear water, and a new life began. 8. Inseminated pots should be placed on the poolside for 2 minutes, and then the excess semen should be flushed with water. After standing for 1 hour, the fertilized eggs will be poured into the hatching tank. Inject water into the hatching tub into the water pipe. The fertilized egg is allowed to stand in the fertilization basin for 2 to 3 minutes, and the excess semen is washed out with clean water and then filled with fresh water. After being fertilized, the egg is afraid of vibration within 1 hour. Vibration can cause death. After the fertilized eggs have stood for one hour, the eggs are transferred to the hatching tank. The water is then injected into the water injection tube of the hatching tank so that the fertilized eggs are incubated in a flowing water environment. Nine, outdoor white and blue sinks, fish aquarists will copy rainbow trout to the basin, do physical examination. At a water temperature of 10 degrees, the ovum develops after 16 days. After 32 days, hatching occurs. After 30 days, the fry begins to eat. The fry eggs and the fry after the start of eating can be used as seedlings to provide breeding grounds and households with food culture. Tenth, Shun Tong rainbow trout breeding center area aerial view panorama with light control method, postponed or advance the golden pheasant, rainbow trout breeding period, so that in the four seasons have mature broodstock breeding, production of seed. The breeding farms and households can obtain seedlings according to the seasons they require and supply commercial fish to the market throughout the year.