The yellow-tailed pheasant is known as Mugil so-iuy and belongs to the family Diptera. The most common species of fishes in this species are the food fish. The common carp species in China are common carp and carp, and it is one of the main breeding objects in China's coastal areas. In recent years, it has become an international breeding target. The southern part of China is mainly raised eel, while the northern coast is mainly cultured eel, so it is known as "southern north?". The breeding experiments showed that compared with the cultured fish in the north, the broiled fish grew faster in the south, and the individuals were large, the breeding cost was low, they did not kill each other, they had strong immunity, and they were not easily sick. In addition, the fish cultured in the south has delicious taste and golden body color and is auspicious. It is more popular among farmers and consumers than eel, and it is commonly known as “Yellow Tail Snapperâ€.
Zhuhai adopted a combination of “corporate + promotion agency + farmer householdsâ€. In 2004, it successfully introduced the cold-water fish, and successfully took the lead in the successful production of yellow-tailed rice seedlings, and realized the development of yellow-tailed muntjac from seedlings to aquaculture in the southern region. The whole process of production. By taking advantage of the advantages of three combinations, Zhuhai has developed Yellowtail as one of the local specialties, which has effectively promoted the adjustment of aquaculture structure.
First, the biological characteristics of the yellow tail plague
The shape of the eel is similar to that of the barracuda, the main difference being that the eel is short and the barracuda is slender, the eel has a large eye socket, the inner membrane and the middle belt are black, and the barracuda has a small eye circle and the ophthalmic liquid is red. Although yellow-tailed pupa has a wide salt temperature, it cannot adapt to severe temperature and salinity changes. It has greater ecological tolerance to oxygen, and the oxygen consumption increases with the increase of individuals. When the dissolved oxygen content in water is greater than 5, it is most favorable for growth. Its diet is very wide, belonging to the omnivorous fish that mainly feed on plants. Under artificial breeding conditions, it also likes feeding such as rice bran, bean cake powder, peanut cake powder, dried leeches, and domesticated artificial feeding foods. Females spawn in deeper sea areas and grow offshore.
Second, seed breeding
Yellow-tailed nursery technology has been very mature. When choosing the broodstock, the females should be aged 4-6 years and above, weigh more than 1kg, males should be 4 years old or older, weigh more than 1.2kg, and the proportion of males and females should be 1:1.5 (or 2); followed by hatching eggs must reach 0.65mm or more; There are many oxytocins that can be used, but care should be taken to use them flexibly depending on the maturity of the broodstock, water temperature, etc.; the salinity of the broodstock holding pool after injection should be kept above 22‰ and the second injection of oxytocic In the 24h period, observe the spawning situation, remove the fish eggs or broodstock in time (the eggs need to be hatched in the fish pond); the newly hatched larvae are cultured for 25-30 days and then put into the earth pond for rough breeding with a density of 100,000. Acres, or stay in the concrete pool, and the density is limited to 50,000/cubic water.
Third, the cultivation of yellow tail plover
Yellow-tailed aquaculture is mainly concentrated in countries along the Pacific coast. The farming area is very wide and the benefits are also very good. They can be cultured in brackish water, seawater or freshwater. The main overseas breeding methods rely on natural natiao and large-scale extensive farming, similar to our country's Hong Kong e farming. In recent years, we have gradually developed to semi-intensive or intensive culture, and carried out a variety of experimental studies to improve the nursery. The survival rate continues to be researched, so that the barracuda breeding technology gradually improved.
Yellow-tailed earthworms generally adopt earth-culture methods. There is no special requirement for the setting of earthen ponds, as long as it is salt water area, convenient transportation, suitable for breeding areas, old shrimp ponds, fish ponds can be. It is required that the salinity be 3‰~18‰. Pure freshwater fish ponds must be desalted in the field. Before the fry are stocked, the ponds and the surrounding environment are trimmed. If the broodstock cultivation pool requires that the bottom of the pond be flat and water-proof, ensure that there are enough water depths to ensure the smooth development of the intensive cultivation and oviposition in a good environment. . Thoroughly clean up, sterilize, and apply fertilizer to ponds and cultured water, and keep the water depth above 1.2m. Equipped with necessary breeding facilities such as aerators.
The old pond should be plowed, exposed, washed or directly splashed with quicklime to promote the expulsion and reduction of organic matter; remove hostile organisms, pathogenic organisms, and pathogen-carrying intermediate hosts; after entering the water for 20cm to 40cm, Quanchipi will be used to disinfect and adjust lime. Water quality can also be used to spill tea bran to kill harmful fish and spill bleach to kill shrimp that eats food (such as Wusu shrimp). After entering the water, the entire pond can be splashed with lime to adjust the water quality and sterilize. The dosage is 12kg/mu. Two weeks before the fish ponds, fresh seawater or brackish water is injected to make the salinity of the pond close to the seed salinity. The difference between the two cannot be greater than 3, so that the pond water depth reaches 1.2m. Inlet water should be carefully filtered with a screen mesh to prevent wild small fish, juveniles, etc. from entering the pond with water. After injecting fresh water into the pond, it began to cultivate basic food organisms and fertilization should be carried out about a week or so before the fish pond. Fertilizers, use of disinfectant drugs, etc. should meet the requirements of relevant guidelines and standards.
The yellow-tailed oystercatcher will be planted around mid-May, and the water should be tested before putting it on seedlings. When laying seedlings, the depth of pool water is 1.2m, the transparency of the pool water is about 40cm, the water temperature should be kept at 25°C, and the salinity should be maintained at more than 6 inches. It is not appropriate to let the seedlings bloom in the strong winds and stormy days. Yellow-tailed hawksbills are generally intensively cultured, but they can be mixed with small amounts of Aconitum argentatus and P. monodon. The stocking size is about 2cm~3cm. The yellow tail larvae are relatively large and the stocking density should not be too dense, usually 3,000~4000 tails/mu.
Yellow-tailed larvae that have been artificially bred have domesticated and fed all artificial compound feeds. The feed is made of cakes, wheat bran, wheat, rice bran or whole artificial feed. The best feed contains more than 31% of crude protein. In the growing season, the daily feed is about 5% of body weight. The density can grow to more than 1kg for ten months in moderate culture.
During the entire breeding period, fresh water must be flushed frequently to improve the water environment and keep the water fresh. Conditional fresh water can be gradually added, or Zhuhai can change its salinity with the changing seasons throughout the year, so that the salinity decreases in the later period of the water. To about 4 ,, so that it can be expected to accelerate the growth rate of yellow pheasant. The water quality is always “fat, live, cool and tender†and the dissolved oxygen is in good condition.
Routine management should strengthen the patrol pool, observation, disease prevention, etc., observe the status of fish fry and the change of water color, observe the feeding and feed utilization. Daily measurement of water temperature, dissolved oxygen, pH, transparency, pool water salinity, and other water quality factors, where conditions can detect changes in ammonia and other water quality factors. Do a good job in breeding logs.
Yellow Tail Hawk must go through the winter to reach the market specification. So faced with a winter problem. Yellow-tailed plover is a cold-water fish and has relatively strong adaptability to water temperature and can naturally overwinter, but it can easily cause death in the event of a sudden drop in water temperature. When the weather turns cold and the water temperature falls below 13 to 14°C, the activity of the yellow-tailed cormorant weakens. As the water temperature continues to fall, it gradually stops feeding. At this time, it is necessary to reduce the amount and stop feeding. Wait for the weather to warm up and feed it properly.
Yellowtail cockroach has few diseases, the most common are parasites, water mold, and enteritis.
Msct Scanner,Gemstone Detector,Vascular CT Scan,Conventional CT Scan
MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com