Yuhang District Heiyu Research Institute has introduced standardized wild-breeding blackfish to implement the standardization of production and breeding of more than 500 million high-quality blackfish seedlings. This has better alleviated the contradiction between the large-scale development of black-fish culture and the shortage of high quality seedlings in our region. Breeding black fry The species showed rapid growth and fewer diseases in the culture and was recognized and welcomed by the farmers. It played an active role in stimulating the improvement of the blackfish germplasm and improving the quality of the products, and introduced and reproduced wild high-quality broodstock. New experiences have been accumulated in respect of cultivation and other aspects, which have laid a good foundation for the construction of seed industrialization. 1, the introduction of wild parents, to achieve species update. In order to improve the quality of blackfish, the introduction of wild blackfish parents is an important measure in response to problems such as declining quality, population degradation, deceleration of growth, and increase of diseases in blackfish aquaculture in recent years. To this end, from December last year, special personnel were organized to select natural wild waters such as lakes and wanderings in Jiangsu, Shandong, Huzhou, and Deqing to screen and introduce wild blackfish parents. It is strictly forbidden to adopt offspring that have been inbreeding in ponds for many years. This year, the actual introduction of 200 wild black fish parents, the weight of each tail is generally up to 1.5 kilograms, the broodstock is robust, abundant body surface mucus, disease-free without injury, the same age. 2. Improve the conditions of fish ponds and improve supporting facilities. According to the requirement of blackfish breeding, the new pond is strictly constructed according to the standard. After the original pond adopts mechanical or artificial dredging measures, the following requirements are met: The broodstock breeding pond area is generally 0.5-1 mu, the water depth is 120-150cm, and the mud at the bottom of the pond is controlled Around 10cm, Tanggu is 40cm-50cm above the water surface, and it is convenient for drainage and drainage. The pond is surrounded by bamboo fences and mesh sheets and is 80cm high. A food platform is built in the pond and is about 4-6 square meters in size. Seed cultivation pond area of ​​about 0.5 acres, water depth 80-100cm, other facilities and broodstock the same. 3, do a good job broodstock cultivation, carry out the breeding of blackfish. One month before the broodstock was stocked, the pond was completely cleared by clear ponds. The medicine used was lime, which was disinfected in a 75-100 kg/mu dry pond to completely kill potential pathogens and predators in the water. After the clear pond is exposed for 5-7 days, the water injection is about 50cm, then it is drained and then the water is discharged. Restocking time last December to January this year. Stocking density is generally 200 kg/mu. The broodstock's bait is mainly small fish. Feeding twice a day, feeding once in the afternoon and in the afternoon. Starting in mid-March, water injection is done once every 10 days, and water injection is started every 5 days in mid-April, about 10cm each time. This year's oxytocin breeding time from the end of April to mid-May, generally adopting natural breeding methods, spawning pool using 300cm300cm or 300cm400cm small earthen pond, or in Datang with bamboo curtains, mesh to form a small pool or small cage, pool Put some small floating lotuses, palm pieces and other materials as artificial fish nests, and pair sexually mature broodstock males and females into spawning ponds for spawning. After the broodstock lays eggs, the broodstock is left in the spawning pool to protect the fish eggs from attack by predator organisms. In the hatchery management, 1/5-1/4 of the incubation water should be replaced every day, and the temperature difference between the water changes should not exceed 2°C. 4, do a good job of seedling cultivation, timely prevention and disease prevention. Before the summer flowers are stocked, clear the pond and disinfect the pond, and use the organic fertilizer as the base fertilizer to cultivate the food organisms in the pool. As the initial bait for summer fry, the summer stocking density is 300-500 tails per cubic meter of water. After the fry were released from the pool, the fry was fed with 4-6 kg of fresh “Red Worm†per acre for 3-4 times a day. After 7 days of stocking, start feeding fish paste, fish gizzards, etc., and make small meals at the time of feeding, usually 3-5 times a day. After 15-20 days of feeding, when most of the fry grow to 3-4cm, they are bred and bred, and the animals are bred in large-scale ponds and transferred to ponds of larger areas for fingerling cultivation to avoid foodstuffs. The stocking density of fingerlings is 580,000 pigs per acre. The feed is sea and freshwater chilled fish. The chilled fish is cut into small pieces and placed on the food table, 2-3 times a day. In the process of seed management, adhere to the process of patrol ponds, observe grounds, add new water, and do a good job of anti-escape. According to the water quality, timely disinfect the water body with bromochlorohydrin to prevent fish diseases. After a month or so, most fish species can be sold for about 10cm.
Common Snapdragon
Seeds during the spring and autumn in the south, the north spring sowing.Seeds small, seedbed to soak first, after waiting for the water area, don't overburden soil, seedbed stays wet.Not resistant to heat, cold, half shadow.Xi loose, fertile and well drained soil, pH 5.5 ~ 7.0, seeding and flowering 11 weeks.Long sunshine promote flower bud differentiation, temperature on plant height, number of flowers and flower have obvious influence.This kind of flower is compact, design and color is gorgeous, for the fine flower bed and flower border material, can be potted ornamental.
Common Snapdragon Seeds,Snapdragon Seeds,Snapdragons Flower Seeds,Summer Snapdragons Seeds
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