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Long-swept? Pond adult fish breeding technology
Leiocassis longirostris Gnther belongs to the order of Siluriformes, Bagridae, Leiocassis, also known as the river group, fertilized fish, and salmon. The meat is delicate and delicious, with a meat content of 74.2%, which is higher than that of grass carp, carp, carp, and carp. The market price of commercial fish around lkg is stable at 30~40 yuan/kg, which is a rare freshwater economic fish of China's specialties. class. Due to the promising market prospects, the supply of fish caught by rivers is in short supply. In recent years, fishery science and technology personnel have successfully carried out artificial breeding and adult fish breeding. March 28, 2002 to December 25, 2002. The author introduced Long Kiss from Guangdong and conducted adult fish breeding in No. 1 and No. 2 ponds in Yangling Town, Miaoling Town, Lingui County, Guilin City. The total area of ​​the two ponds is 0.6hm2, and the average size of 667m2 is 168g long-knit and 889-tailed, accounting for 66.7% of the total number of foster care; the total output value is 188405 yuan, the total profit is 61,632 yuan, and the average profit is 6,848 yuan/667m2, which is better Aquaculture benefits. This article briefly describes the long-swept and adult culture techniques for reference by peers. l Long conditions for fish ponds and fish ponds. Adult fish ponds should have sufficient water sources, fresh water, and energy-discharge irrigation. The area is about 0.667 hm2, preferably 2,000-3335 m2. The water depth is maintained at 1.5~2.0m. Slurry thickness 10~15cm. In the middle of the pond, shading or concealed objects are provided for long kisses. Every 2000~3335m2 water surface should be equipped with 1.5kw aerator. Fish ponds should be cleared by conventional methods before stocking. 2 Long-knot fish species are released. The fish species are mainly fish stocks of 1 instar size 50-150g, stocking 600-900 fishes per 667m2, accounting for 60%-70% of the total stocking capacity; ~300 tails/667m2, plus 10 to 20 tails/667m2. (The fish ponds in good condition can be stocked up to 1000 fish/667m2.) The fish species should be free from injury and lively. Fish seedlings were soaked in 4%~5% saline for 8~10min. 3 feed feed long-knee? For carnivorous ground fish, can be fish, shrimp, fish and animal viscera and other pure animal feed, but also can feed artificial feed. Adult fish breeding is mainly fed with artificial compound feed. The crude protein content of feed is 38% ~ 45%, crude fat 6% ~ 9%, crude fiber 4% ~ 6%, sugar 23% ~ 27%. The feed ingredients are fish meal, meat and bone meal, blood meal, yeast, cotton cake, wheat bran, and corn. The feed pellet diameter should be adapted to the fish's caliber (typically 3 to 5 mm). It can be fed now, but it can also be stored for future use. The fixed-point feeding was conducted and fed twice a day (9:00~10:00; 17:00~19:00). The daily feeding amount was 5%~8% of the fish's body weight. The specific feeding amount was considered as feeding. When the size of the catch fish school is set, during the feeding process, feeding can be stopped when the catch fish population is small and the clustering is poor. 4 daily management of the long-term survival temperature is 1 °C ~ 38 °C, growth temperature is suitable for 15 °C ~ 3l °C, the optimum growth temperature is 25 °C ~ 28 °C. Below 18 °C and above 30 °C when the slow growth, below 10 °C and above 3l °C basically stopped feeding. Therefore, feeding management should be strengthened within the optimum growth temperature range to ensure adequate feed quality and quality; when the temperature is below 10°C and above 3°C, less feeding or no feeding is needed to avoid feed wastage and increase the cost of raising. . In addition, the oxygen consumption rate of Long Kiss is significantly higher than that of grass carp, clams, cockroaches, and oysters, and is also higher than that of big clams. In the optimum growth water temperature, if the dissolved oxygen content is kept above 5mg/L, the long-knot diet is strong, the growth rate and feed remuneration are high; the dissolved oxygen is lower than 3mg/L, the food intake is reduced, the growth is slow, and the feed The coefficient increases; when the dissolved oxygen drops to 2.0 mg/L, floating heads appear. Therefore, the feeding and management process must maintain the quality of fresh water; adhere to the patrol pond on a daily basis; open the aerator in time to prevent fish from oxygen-depleting floating heads, and use aerators in a reasonable manner, except when the floating head is turned on until the fish sinks. In order to enhance the long-sweet appetite and promote its growth, in its optimum growing season, it is necessary to keep booting for 2~3 hours every day at noon in order to keep the dissolved oxygen in the pond and promote the material circulation in the pond. Wherever possible, change the water every 15 days, and replace 50% of the original pond water each time. 5 Fish Disease Prevention and Control Relative to domestic fish, long kisses, strong resistance to disease, low incidence of adult fish breeding stage. Its main susceptibility to disease is enteritis, hydromycosis, echinococcosis, oblique tuber disease and anchor head lice. In the prevention and treatment of diseases, prevention is the mainstay, and prevention and control are combined. In the disease-prone season, regularly add allicin and other drugs to the feed in the feed; sprinkle strong chlorine (0.3 g/m3 water) once every 15 days or disinfect and adjust the water quality every 15~20 days with quick lime 15~25kg. It has a good effect in preventing or reducing the occurrence of diseases. 6 Harvesting large-size long-kissed fish species with 50-150g in weight. The fish can be harvested and marketed after 6 months of 655-750g. Fishing methods can be staged or caught in dry ponds, depending on the circumstances. The harvesting process should be carefully handled to prevent the fish from being injured so as not to reduce the quality of commercial fish.