Paddlefish, also known as duckbill, is native to the United States. It grows fast, has a large individual, is delicious in meat, and has a high nutritional value. It is a valuable economic fish that is both edible and ornamental. Paddlefish can be cultured in rivers, reservoirs and ponds. In order to develop paddlefish breeding, optimize the structure of aquaculture species, and improve the overall efficiency of fish farming in large water areas, Hangzhou Aquatic Technology Promotion Station and other units conducted paddlefish cage culture experiments at Qiandao Lake in Panan from 2002 to 2003. After two years of breeding experiments, good production and economic benefits have been achieved: the average output reached 9.15 kg/sq.m., which is equivalent to 6100 kg/mu. The specifications reached 450 to 750 g/tail: the net profit per square meter reached 452.7 yuan. The input-output ratio is 1:2.22. Paddlefish cage high-yield culture techniques are summarized below.
First, the site selection and cage settings (A) the choice of farms: farms selected in Chunan County Qiandao Lake part of the Bay. The water area of ​​the culture area is large, water depth is more than 8 meters, dissolved oxygen 9-9mg/L, PH value 7-8.4, total hardness 20-40 mg/L, ammonia nitrogen 0.02-0.06 mg/L, nitrite 0.0015- 0.01 mg/L, good water quality, in line with GB11607 standards.
(B) cage structure and settings: cage frame using simple bamboo and angle iron frame. The box material is made of polyethylene without knotting mesh. The cage specifications are 3m 4m 3m and 5m 6m 4m. Mesh size 2a = 1.0-2.5 cm.
Second, the main technical measures (a) seed selection and stocking: Choose healthy, swim, lively, neat specifications, disease-free and injury-free quality seed. Stocking density is 20-40/m2. According to the characteristics that paddlefish seedlings are sensitive to changes in water temperature, the temperature difference should not be too large when the seedlings enter the box, and should not exceed 2°C. Before entering the box, use 1.5%-2.0% saline solution to disinfect the fish for 8-10 minutes.
(B) Scientific Feeding: The key to cage culture of paddlefish is to feed. At the beginning of stocking, zooplankton (such as red worms) were mainly fed, and then gradually converted into buoyant pellet feed and supplemented with light bait at night. The feed requires fresh and undamaged, nutrient-rich, particle size palatability. Feeding follows the "four principles" principle. Feeding capacity is normally determined based on the temperature of the water in normal conditions. When the water temperature is 20-30°C, the daily feeding rate is 1.5%-3%; when the water temperature is lower than 20°C, the daily feeding rate is 0.5%-1.0%. Specifically according to the feeding situation, weather, water quality and other timely high-speed. Feeding times are 3 times a day, 7-8 am, 11-12 pm, and 6-7 pm.
(c) in a timely manner binning: paddlefish grow fast, after feeding for a period of time, there will be differences in specifications between individuals, should be cultivated in accordance with the specifications in time to avoid polarization, is conducive to improving the survival rate.
(D) Career Tour: Strict implementation of the early, middle and late tour system. Carefully observe the feeding and activities of the squid and remove the bait in time. Rinse the cage regularly to prevent clogging of the mesh and affect the exchange of water inside and outside the box.
2, to ensure the safety of cages: rainy days and stormy season, at any time pay attention to strengthening cages. Also check the cage regularly for any damage, and repair it if it is damaged. Black screened nylon cloth and anti-theft net should also be installed on the top of the cage.
3. Make daily records: record the temperature, water temperature, feeding amount and the number of deaths on the day. Abnormal conditions were found and timely measures were taken.
(e) Prevention and treatment of fish diseases: Adhere to the principle of “prevention from the main and health managementâ€. The seedlings are stocked and fed into the tank with a drug bath of 1%-2% of salt or 0.4ppm of dibromohydantoin, and used 15ppm of quicklime and 0.3ppm in the cage every 20 days or so. Disodium bromide disinfection. Illegal drugs are strictly prohibited in the waters surrounding the cages.
First, the site selection and cage settings (A) the choice of farms: farms selected in Chunan County Qiandao Lake part of the Bay. The water area of ​​the culture area is large, water depth is more than 8 meters, dissolved oxygen 9-9mg/L, PH value 7-8.4, total hardness 20-40 mg/L, ammonia nitrogen 0.02-0.06 mg/L, nitrite 0.0015- 0.01 mg/L, good water quality, in line with GB11607 standards.
(B) cage structure and settings: cage frame using simple bamboo and angle iron frame. The box material is made of polyethylene without knotting mesh. The cage specifications are 3m 4m 3m and 5m 6m 4m. Mesh size 2a = 1.0-2.5 cm.
Second, the main technical measures (a) seed selection and stocking: Choose healthy, swim, lively, neat specifications, disease-free and injury-free quality seed. Stocking density is 20-40/m2. According to the characteristics that paddlefish seedlings are sensitive to changes in water temperature, the temperature difference should not be too large when the seedlings enter the box, and should not exceed 2°C. Before entering the box, use 1.5%-2.0% saline solution to disinfect the fish for 8-10 minutes.
(B) Scientific Feeding: The key to cage culture of paddlefish is to feed. At the beginning of stocking, zooplankton (such as red worms) were mainly fed, and then gradually converted into buoyant pellet feed and supplemented with light bait at night. The feed requires fresh and undamaged, nutrient-rich, particle size palatability. Feeding follows the "four principles" principle. Feeding capacity is normally determined based on the temperature of the water in normal conditions. When the water temperature is 20-30°C, the daily feeding rate is 1.5%-3%; when the water temperature is lower than 20°C, the daily feeding rate is 0.5%-1.0%. Specifically according to the feeding situation, weather, water quality and other timely high-speed. Feeding times are 3 times a day, 7-8 am, 11-12 pm, and 6-7 pm.
(c) in a timely manner binning: paddlefish grow fast, after feeding for a period of time, there will be differences in specifications between individuals, should be cultivated in accordance with the specifications in time to avoid polarization, is conducive to improving the survival rate.
(D) Career Tour: Strict implementation of the early, middle and late tour system. Carefully observe the feeding and activities of the squid and remove the bait in time. Rinse the cage regularly to prevent clogging of the mesh and affect the exchange of water inside and outside the box.
2, to ensure the safety of cages: rainy days and stormy season, at any time pay attention to strengthening cages. Also check the cage regularly for any damage, and repair it if it is damaged. Black screened nylon cloth and anti-theft net should also be installed on the top of the cage.
3. Make daily records: record the temperature, water temperature, feeding amount and the number of deaths on the day. Abnormal conditions were found and timely measures were taken.
(e) Prevention and treatment of fish diseases: Adhere to the principle of “prevention from the main and health managementâ€. The seedlings are stocked and fed into the tank with a drug bath of 1%-2% of salt or 0.4ppm of dibromohydantoin, and used 15ppm of quicklime and 0.3ppm in the cage every 20 days or so. Disodium bromide disinfection. Illegal drugs are strictly prohibited in the waters surrounding the cages.
Diagnostic Devices,Diagnostic Medical Devices,Medical Routine Diagnostic Tools,Medical In Vitro Diagnostic Tools,Digigal Thetmometer,Stethoscope,Syhygmomanometer
Surgimed Medical Supplies Co.,Ltd , https://www.surgimedcn.com