Technical points for improving hatching rate of oviposition spawning
2019-06-11 11:05:15
Cultivation of seedlings of Astragalus is the key. High-quality yellow seedlings are generally introduced from the technically reliable Huanghua breeding farm. To obtain better economic benefits, you must breed your own species of yellow peony. Because of the greater difficulty in breeding techniques of Astragalus, the author now summarizes his own practical experience of breeding and breeding seedlings for several years, for your reference. According to this technique, the amount of oviposition spawning can be increased by about 30%.
First, simulate the natural ecological environment and build a breeding pond. It is necessary to choose a venue and build breeding and spawning grounds. In plant breeding ponds, plants such as water lettuce and water peanuts should be planted, and some stones and bricks should be placed at the bottom of the pond to simulate the natural ecological environment to facilitate spawning.
Second, disinfection and sterilization, adjust the water quality level. The breeding pond water must be non-toxic river water, lake water or groundwater. The pH of the water is preferably between 6.2-7.8, and the water level is 20-30 cm deep. The newly-built cement pool must also be treated with alkalinization. -210-6 bleach disinfection, each dose should be less to avoid irritating the species.
Third, choose a strong species, individual size suitable. The species must be selected for strong, well-sized individuals. Too small individuals do species breeding, spawning less, quality is also poor, hatching rate is low; because of the sexual reversal characteristics of the astragalus, too large individuals are more likely to be male, the result is a large proportion of males, there will be low egg production. It is best to choose 100-150 grams of astragalus to do spawning and pro-spawning. At this time, the proportion of males and females of astragalus is 1:3-4, and the stocking density should be appropriate. The amount of eggs.
Fourth, according to the breeding season needs, reasonable feeding feed. The breeding season for Astragalus is from April to September. At this time, feeds with higher protein content, such as fish paste and mash, should be fed together with the full-price compound feed. Sexually matured jaundice will lay eggs 5-7 days after they are fed high protein diets. The eggs are produced on the side of plants or stones, and as long as the white foam is found, it may be the production of ovaries.
Fifth, pay attention to regulate the water temperature, do a good job hatching. The size of the oviposition spawn is related to the individual size of the O. sativa. The oviposition of the O. sativa is large and the eggs produced are larger, and vice versa. Yellow quail eggs are round, golden yellow, shiny, transparent and non-sticky outside, floating on the edge of aquatic plants or rocks with white foam. Spawning volume is generally about 500 tablets each time, and more than 1,000 can be obtained. During the spawning season of the oystercatcher, each morning in the spawning ponds, if there is a white foam producing ovaries, it is necessary to gently move into the hatchery and use microfluidic water to hatch. The fertilized eggs swell up to about 4 mm after absorbing water, and the incubation time is about 4-7 days depending on the temperature of the water. When the water temperature is 25°C, the hatching is completed within 6 days. After the hatching of the seedlings, the water temperature at 28°C for 10 days or so, up to 26 mm in length, the yolk sac did not completely disappear. After 7-10 days after the yolk sac is fully harvested, plankton can be ingested in water. At this time, a small amount of leeches can be fed. After 35 days or so, the larvae can grow to 5-6 cm in size and can be kept in the rearing pond. When the seedlings are released, they must be distributed separately depending on the size of the individual.
Six, regular quantitative feeding, and promote the breeding of eggs more. Whether it is spawning species or newly hatched seedlings, it should be fed regularly. Spawning species are fed twice a day, around 8 am, and each time they are fed at about 6 pm, each time they are fed at 2%-3% of the total weight of the species. Seedlings are fed once a day, between 5-7 pm in the afternoon.
First, simulate the natural ecological environment and build a breeding pond. It is necessary to choose a venue and build breeding and spawning grounds. In plant breeding ponds, plants such as water lettuce and water peanuts should be planted, and some stones and bricks should be placed at the bottom of the pond to simulate the natural ecological environment to facilitate spawning.
Second, disinfection and sterilization, adjust the water quality level. The breeding pond water must be non-toxic river water, lake water or groundwater. The pH of the water is preferably between 6.2-7.8, and the water level is 20-30 cm deep. The newly-built cement pool must also be treated with alkalinization. -210-6 bleach disinfection, each dose should be less to avoid irritating the species.
Third, choose a strong species, individual size suitable. The species must be selected for strong, well-sized individuals. Too small individuals do species breeding, spawning less, quality is also poor, hatching rate is low; because of the sexual reversal characteristics of the astragalus, too large individuals are more likely to be male, the result is a large proportion of males, there will be low egg production. It is best to choose 100-150 grams of astragalus to do spawning and pro-spawning. At this time, the proportion of males and females of astragalus is 1:3-4, and the stocking density should be appropriate. The amount of eggs.
Fourth, according to the breeding season needs, reasonable feeding feed. The breeding season for Astragalus is from April to September. At this time, feeds with higher protein content, such as fish paste and mash, should be fed together with the full-price compound feed. Sexually matured jaundice will lay eggs 5-7 days after they are fed high protein diets. The eggs are produced on the side of plants or stones, and as long as the white foam is found, it may be the production of ovaries.
Fifth, pay attention to regulate the water temperature, do a good job hatching. The size of the oviposition spawn is related to the individual size of the O. sativa. The oviposition of the O. sativa is large and the eggs produced are larger, and vice versa. Yellow quail eggs are round, golden yellow, shiny, transparent and non-sticky outside, floating on the edge of aquatic plants or rocks with white foam. Spawning volume is generally about 500 tablets each time, and more than 1,000 can be obtained. During the spawning season of the oystercatcher, each morning in the spawning ponds, if there is a white foam producing ovaries, it is necessary to gently move into the hatchery and use microfluidic water to hatch. The fertilized eggs swell up to about 4 mm after absorbing water, and the incubation time is about 4-7 days depending on the temperature of the water. When the water temperature is 25°C, the hatching is completed within 6 days. After the hatching of the seedlings, the water temperature at 28°C for 10 days or so, up to 26 mm in length, the yolk sac did not completely disappear. After 7-10 days after the yolk sac is fully harvested, plankton can be ingested in water. At this time, a small amount of leeches can be fed. After 35 days or so, the larvae can grow to 5-6 cm in size and can be kept in the rearing pond. When the seedlings are released, they must be distributed separately depending on the size of the individual.
Six, regular quantitative feeding, and promote the breeding of eggs more. Whether it is spawning species or newly hatched seedlings, it should be fed regularly. Spawning species are fed twice a day, around 8 am, and each time they are fed at about 6 pm, each time they are fed at 2%-3% of the total weight of the species. Seedlings are fed once a day, between 5-7 pm in the afternoon.
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