All the mesh of Tmax A Type Chicken Cage are made of aluminum-zinc wire, it is 3-4 times anti-corrosive than the hot galvanized ones. The stable structure and hot-dip galvanization technology can ensure service life of 15-20 years.
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1 Introduction and Cultivation of Broodstock
In mid-February 2003, 120 adult fishes of 2 winters were introduced (the source of the fish was from some sea fishing species and some adult fishes grown from Taiwan), and the body weight was 1.5-2.0 kg. After long-distance transportation, Surviving 107 tails, placed in Jingwei Bay, Jingwei Bay, Zhangpu County, cage cultivation, cage specifications 3m3m3m. Fresh fish were fed 1 to 2 times per day, and the fed amount was 8% to 12% of body weight. During broodstock incubation, the water temperature is 10 to 32°C, the pH value is 8.0 to 8.4, and the specific gravity is 1.009 to 1.022. The fish body is regularly sterilized with drugs such as "freshwater bath", dibromohydantoin and formalin, and Vb, Vc, allicin and other drugs are added to the diet to prevent disease. Regular inspection of gonadal maturity, found that part of the broodstock reached maturity in mid-April.
2 Induction, Fertilization and Hatching
In mid-April 2003, the broodstock was examined and found that some of the broodstock had reached sexual maturity. The male fish gently squeezed the abdomen, and the semen naturally flowed out. The female fish took eggs for microscopic examination and the gonadal development had reached the beginning of IV. In early May, most of the broodstock reached maturity, and the broodstock (43 males and 64 females, average weight 1.75kg, maximum 2.10kg, minimum 1.52kg) was transferred to the Aquaculture Co., Ltd. of Zhangpu County Aquarium for brooding brooding ,Oxygen production tank square, an area of ​​60 square meters, water depth 80cm. Induction of labor using LRH-A210μg + HCG200IU/kg, one-time intramuscular injection, eliminating the water temperature 22 ~ 26 °C, specific gravity 1.021 ~ 1.022, inflated urine pool, shading. The first batch of eggs was produced on May 17, 2003; the broodstock was transferred to the urine production pond on April 28, 2004, and the first batch of eggs was produced on May 2. On May 18, 2005, the broodstock was moved into the room for oxytocin production. The first batch of eggs was produced on the 20th.
The fertilization methods are all natural spawning and fertilization. The fertilized eggs are collected and hatched in an indoor nursery pond. Before fertilization, the fertilized eggs are placed in a hatchery and the dead eggs are removed by separation. There are 8 nursery ponds, each with an area of ​​24 to 36 square meters and a depth of 1.20m. The hatching density is 30,000-80,000 particles/m3. Seawater is precipitated and filtered. The water temperature is 22 to 26°C, the specific gravity is 1.020 to 1.022, and the pH value is 8.0 to 8.4. The inflating process continues without interruption.
From 2003 to 2005, a total of 1.837 million fish species with a body length of 2.5-3.5cm were cultivated, of which 214,000 were reared in an indoor environment and 1.623 million were reared in earthen ponds. The average survival rate from hatched larvae to fingerlings was 9.96%. The average survival rate of breeding was 24.32% and the highest was 24.71%. The average survival rate of soil-breeding breeding was 7.45% and the highest was 10.18%.
3 Seed cultivation
3.1 Indoor nursery ponds cultivate larvae (1.65 ~ 1.70mm in length), change the water by 50% to 70%, and then change the water every 2 to 3 days according to the water quality, change the water volume by 30% to 50%, and after larvae are hatched From the 3rd to the 4th day, the digestive tract was obviously bent, the stomach was differentiated, the mouth was open, the eyes became dark, and the larvae were open. The open bait is a rotifer, which is fed twice per d, so that the density of the rotifer in the water is maintained at 3 to 8 cells/mL, and the opening is 7 to 8 days. When the body color begins to turn black, it can be removed from the earthen pond for cultivation. In 2003 and 2004, planting seedlings were planted and a certain amount of juveniles with a length of 2 to 3 cm were bred indoors. The method was as follows: Opening 10 to 15 days, the larvae of Artemia larvae were started to feed, and the hatching was started 14 to 17 days later. Foot species, opening 20 ~ 25d, when the fish body grows to 1.5cm body length began to training feed fish slurry, with the growth of the fish fry continue to increase the amount of water (water training began to feed the fish slurry when the replacement of 150% to 200%) The cultivation process is continuously inflated with a water temperature of 22-26°C and a specific gravity of 1.020-1.022.
3.2 Outdoor soil pond nursery began in 2003 to conduct outdoor soil pond nursery. Outdoor pond nurseries were mostly conducted using shrimp culture ponds. The shrimp pond area was mostly 10 to 50 mu and the water depth was 1.5 to 2.0 m. 8-12 days before planting, use bleaching powder, tea cakes, etc. to disinfect and injure, and then inflow water of 80-100cm (filtered through a 60-mesh sieve), fertilize rotifers, copepods and other basic baits, and fertilizers are mainly organic fertilizers. Fertilizer supplemented. Check the zooplankton in the pool water to a certain density, the indoor larvae will be down. In 2003 and 2004, it was 4d under the opening pond, while the lower larvae were 7.64 million and 1.66 million respectively. In 2005, it was 8d in the lower pond and 12.5 million in the lower larvae. The pre-feeding period (up to 1.5cm in length) is dominated by zooplankton, and in the middle and late period, part of the fish slurry or minced shellfish is used according to the density of zooplankton in the water. In the early stage, mainly water was added. In the middle and later periods, the amount of water was changed according to the water quality. Water temperature 22.0 ~ 26.0 °C, specific gravity 1.020 ~ 1.022, pH 8.2 ~ 8.7, after 25 ~ 30d culture up to 2.5 ~ 3.5cm can be out of the pond to the cage or pond for development.
4 Summary According to three years of experimental observation, Huawei pepper larvae are wide-temperature, with a certain degree of tolerance to low-specific breeding species, the appropriate temperature range of 5 ~ 35 °C, the most suitable 16 ~ 28 °C, suitable salt 15 ~ 40, the most Suitable for 30% to 35 ‰, poor resistance to hypoxia, less than 2mg / L may occur hypoxic floating head, or even death, the optimal 5 ~ 8mg / L. Its suitable pH range is 6-9, most suitable 7.5-8.5.
In artificial breeding of T. oleifera, indoor cultivation of cement pool nursery can fully guarantee the quantity and quality of the diet, and water quality conditions such as temperature and salinity can be manually adjusted to the optimum value. Therefore, breeding to fish species (body length 2.5-3.5cm) ) The survival rate is significantly higher than that of earthen ponds. Through three years of experimental observation, the relationship between the size of larvae and the survival rate of seedlings shows that larger larvae have a stronger ability to adapt to the external environment. Putting them into earth ponds can effectively improve the survival rate of their fingerlings.
Author: Zhangzhou Aquatic Technology Promotion Station
Our R&D Team can supply the Scientific Integration Scheme by computers for all kinds of Chicken Farms according to Clients` special requests.we have different types of Cages For Layers,pullets,broilers and breeding chickens,and all OEM cages from clients are available,because we have the complete advanced Production line including Wire Drawing,Automatic Cage Meshes Welding,Cold&Hot Galvanization and Automatic System in Mechanical Working for Feeding, Egg Collection machines,so the QC Team can control all product quality we produce for clients in our factory.
Plectorhynchus cinctus belongs to the order Plectorhynchus cinctus, which belongs to the order Pterophylla, Dendrobium, and the common name Huaji, and is a false “Baogongâ€. It is mainly distributed in South Japan and the South China Sea, Sri Lanka, and the Arabian Sea. It has a wide range of suitable temperature, a certain salinity, strong disease resistance, fast growth, omnivorous feeding habits, and can reach commercial specifications in one year of breeding. It has the characteristics of tender meat, delicious taste and rich nutrition. , Japan and South Korea and other places have become a more stylish food fish. From the late 1990s, aquaculture companies in some areas of Guangdong began breeding peppertail flowers. Since the seedlings are mainly purchased from Taiwan and relied on natural seas, they cannot form a large scale of cultivation. In order to break through the mass production of seedlings of Hua Duo pepper, artificial breeding of Hua Duo pepper was conducted from 2003 to 2005.