We are China ningxia middle seed producer, we provide quality of Cucumber seeds, green skin cream Melon Seeds, we produce seeds of cucumber seeds are clean, facilities, outdoor cultivation, good shelf quality, disease resistance is stronger, cucumber is up to 3500 kg per mu, milk melon of up to 3000 kg per mu. Cucumber seeds Cucumber Seed,Green Skin Milk Melon Seeds,Early Maturity Vegetable Cucumber Seed,Hybrid Little Cucumber Seeds Ningxia Zhongqing Agricultural Technology Co. Ltd. , http://www.zq-vegetableseeds.com
Cloud spot culture technology
The cloud spot is a fish of the order Aphididae, also known as a brown head. It is a warm-water freshwater fish, with delicate meat, delicious taste, fast growth, high yield, strong adaptability, easy feeding, wide range of recipes, strong disease resistance and easy catching. Cloud spots are suitable for breeding in freshwater waters such as ponds, rice fields, lakes, and reservoirs. They are a good breed of freshwater culture. (A) of the biological characteristics of cloud spots 1, morphological characteristics of cloud spots? Medium body size, round body fat front, body rear part of the narrow, slightly flat side. Kiss wide and blunt, there are two pairs of front and rear nostrils. Mouth position, horizontal mouth split. There are 4 pairs of tentacles. The top of the tail fin is flat. The cloud spot, the back of the head, the back of the body is tan or gray-brown, the sides are light in color, there are indistinct brown cloud spots, the lower part of both sides is flower white, and the abdomen is silver-white to gray. The entire appearance resembles a stingray (Huang Lading). 2, living habits cloud spot? Are benthic fish, like living in organic-rich, aquatic plants clustered, the bottom of the sediment ponds, lake branches, rivers and streams. Cloud spot, bulimia, likes feeding in the sun, nocturnal habits. Cloud spots have strong adaptability, and they have great tolerance for temperature, oxygen and pollution. The suitable temperature is 5 ~ 36 °C, the optimum growth temperature is 18 ~ 36 °C, the lethal temperature is 40 °C. Cloud spot? The demand for oxygen is not high, the normal growth of dissolved oxygen in the 1.5 ~ 2.5 mg / liter, when the dissolved oxygen in the water is lower than 0.4 mg / liter began to float head. In winter, when the dissolved oxygen in the water is less than 0.2 mg/L, cloud spots can still live. Cloud spot? The normal growth pH is between 6.5 and 8.9. The range of adaptation to salinity is also very wide, and it usually lives in fresh water, but it can survive in salinity as high as 8‰ to 15‰. 3, feeding cloud spots? Is omnivorous, mainly ingest water plankton, aquatic insects, benthic organisms, organic debris, algae, aquatic plants, and other miscellaneous fish. Under artificial breeding conditions, cloud spots not only ingest natural food, but also like to eat food such as bean cake, wheat bran, and compound feed. 4, age and growth cloud spot? Is a medium-sized fish, the general individual length 20.3 ~ 35.6 cm, the longest up to 53 cm. The growth rate is fast, and the maximum weight is about 3 kg. When the temperature is between 18 and 30°C, the growth rate of cloud spots is faster. The body length of a winter fish is 12 to 16 cm, and the body weight is 80 to 150 grams. The body length of a winter fish is 16 to 25 cm and the body weight is 250 to 250. 400 grams; 3 body weight of winter fish 25 to 33.5 cm, weighing 400 to 650 grams. (II) Cultivation of broodstock and broodstock 1. Breeding of broodstock by broodstock: The sexual maturity and ovulation of broodstock related to the broodstock are related to the age of the broodstock and the size of the individual. The individual with the 2nd age and 0.25-0.5kg is the best, and the physique is required to be strong. No injuries, complete fins, no disease. 2, the choice of broodstock broodstock pool is generally 1 to 2 acres is appropriate, near the water to facilitate irrigation and drainage, water depth of 0.6 to 1.2 meters is appropriate. The bottom of the pond requires less silt, soft soil, flat bottom, and some sand and aquatic plants are better. 3. The stocking density of the broodstock broodstock depends on the size of the pond, generally 200 to 300 per acre, with a male to female ratio of 3:2. In addition, a small amount of flowers and white lice can be set in the broodstock pool, which is conducive to the control of water quality. Be careful not to match benthic fish. 4. For the broodstock after wintering, the feed should adopt intensive and intensified breeding measures. The protein content of cloud-breasted broodstock is required to be 28% to 30%. The feed is prepared by mixing fishmeal, bean cake, rice bran, wheat bran, etc. Feeding volume should be based on changes in temperature and the broodstock feeding situation. When the water temperature is 7 to 12°C, the feed amount is 1% of the fish body weight; when it is 12 to 20°C, it is 2% to 3%; and when it is 20 to 30°C, it is 4% to 6%. Due to cloud spot, the most active food in the morning and evening, and like to eat in groups, so feed 2 times in the morning and evening. Feeding place and time should be basically fixed. One month before reproduction, some malt is fed every few days to promote broodstock maturation. 5, broodstock management feed requirements fresh without deterioration, the amount of feeding to eat in 2 to 3 hours for the degree. Strengthen the daily observation of the ponds, keep the water fresh, and timely irrigation and drainage. During broodstock breeding, water stimulation every few days can promote broodstock sexual maturity and timely ovulation. (c) cloud spot? breeding habits 1, courtship pairing In the reproductive season, males choose a good spawning site, and then follow and attract females into spawning sites, and began mating and fertilizing. In the course of courtship pairing, male and female fish bite and cause death and injury. 2, the production of ovarian cloud spots? The requirements of the spawning pool sediment is not high, but not too hard, and its own mining of the fish nest as long as it can accommodate a pair of broodstock, more casual. Before placing the broodstock, pits with a diameter of about 0.3 meters and a depth of 0.1 meters can be manually excavated in a spawning pond at intervals of 1 metre or more for broodstock production as ovaries, reducing the energy consumed by broodstock nesting. 3, spawning, hatching (1) cloud spot? Female eggs 1 egg maturation 1 year, mostly one-time output. Spawning is generally conducted under good weather conditions. The optimum temperature is 23 to 28°C, the pH is 6.5 to 8, and the transparency of the pool is 0.35 meters. The broodstock can lay eggs at a depth of 0.3 to 1 meter deep. If the water temperature is below 21°C, it is difficult to lay eggs. Females weighing 0.25 to 0.5 kilograms typically produce 2,000 to 3,000 eggs. (2) Cloud spotting? Natural fertilization, there are two ways to hatch: First, any broodstock self hatching; Second, artificial collection of egg blocks in the broodstock, and then running water incubation. Either way, good water quality and high dissolved oxygen are required. Hypoxia causes the broodstock to leave and no longer protect the eggs. Cloud spot? Has the habit of protecting the young, the fertilized egg is protected by the male and female fish or the male fish, is protected from the enemies harm, and the broodstock fan moves the water, promotes hatching. After 6 to 9 days of incubation, the hatched fry is still protected by broodstock until the larvae grow 1.5 to 3 centimeters away from the nest and the broodstock leaves. (3) Artificial incubation management. Observe whether there are eggs in the production ovaries from 9:00 to 11:00 in the morning. If there are egg masses, gently drive off the broodstock, remove it gently with both hands, and return it to the hatchery for hatching. Because of the cloud spot, spawning occurs in the evening and early morning. It will not interfere with normal spawning during this time. The eggs are collected from the ovaries into the incubator and disinfected first, and they are sterilized once a day before the eyes appear. For example, bacterial disease is soaked with 3 mg/elevated potassium manganate for 10 to 15 seconds or 8 mg/l oxytetracycline for 50 to 60 seconds; mycosis is soaked with 100 mg/liter formalin for 4 to 5 minutes. Unfertilized eggs appear white and will mold and affect the normal hatching of other eggs and should be promptly removed. 4. The transport of fish eggs is usually transported back to the hatchery with a bucket of water. In the process of egg retrieval and oviposition, care should be taken to prevent direct sunlight, because the ultraviolet light will kill the eggs. The time the fish eggs are in the barrel should not be too long. They should be sent to the hatchery immediately for hatching to avoid suffocation due to lack of oxygen. (D) artificial hatching fry can be taken after hatching, artificial 1 cm diameter plastic tube can be used to suck out the fry, this will be able to remove all fry, easy to focus on cultivation. It is also possible that 9 to 10 days after spawning, when the larvae grow to 1.5 cm or so, they can freely swim and leave the nest. As the larvae feed actively in the early morning and late evening, they swim in groups. Every morning, they dip the nets by hand. Larvae are picked up and concentrated in one place for cultivation. Because the fry have left the nest at this time, it is not easy to remove all the fry. (5) Selection of sex spots and maturity of broodstock, broodstock, sex identification of broodstock, and sex of broodstock in the young and non-reproductive seasons. In the reproductive season, when the fish grows to more than 0.25 kg, they can be identified based on the difference in the genital pores, body shape, and color of the fish. The head of the male fish is brighter, flatter, more muscular than the female, and the body is elongated and grayish black. Raise the male's abdomen with a pronounced genital process. Females have narrow heads, plump bodies, round body fats, and most are yellow or light yellow. The gonads of the female fish were round, and the two holes of the colony were separated by a flap-like skin to form a furrow, but the interval was smaller than that of the male. 2, broodstock maturity of the identification of females should choose to expand the abdomen soft, abdominal circumference and body length ratio of 0.7 to 0.85, engorgement, redness, congestion, slightly protruding, with a finger gently press the abdomen there will be egg outflow. Male fish should choose body color gray, genital enlargement, rough surface, the end of the genital congestion redness. Mature male testicles are dendritic and generally cannot semen.