Technical points of culturing duckbill fish

With the continuous development and growth of China's aquaculture industry, various aquaculture industries continue to rise, among which fish farming is still common, but there are many types of fish, so the investment costs and profit returns of different fish farming are different, and different fish require different food and growth environment.

Site selection and cage setting of duckbill fish 1. Selection of culture site. The breeding site was selected in the steep depression reservoir in front of the city. The water area of the culture area is large, the water depth is more than 6m, the dissolved oxygen is 6~9mg/L, the pH value is 7~8.4, the total hardness is 20~40mg/L, the ammonia nitrogen is 0.02~ 0.06 mg/L, the nitrite is 0.0015~ 0.01 mg/L, and the water quality is good, which meets all the requirements of GB1160 Fishery Water Quality Standard and NY5051-2001 Pollution-free Food Freshwater Culture Water Quality Standard. 2. Net cage structure and setting. The net cage setting refers to the silver carp net cage, and the water area rich in plankton is selected. The water flow is stable, the wind is sunny, and the environment is quiet. The net cage frame adopts a simple bamboo frame. The box material selects polyethylene knotless mesh. The net cage size is 5m × 5m ×2.5m, and the mesh size is 2.5cm. paddlefish afraid of light, cage surface covered with black film.

1. Seed selection and stocking. Select healthy, active swimming, neat specifications, no disease and no injury of high-quality seedlings. The stocking density is 20~40 fish per square meter. The specification is 10~15cm. According to the sensitive characteristics of paddlefish fry to water temperature change, the temperature difference should not be too large when the fry enters the box, and it is better to adjust it to be consistent as much as possible. Before entering the box, disinfect the fish body with 1.5%~2.0% saline for 8~10 minutes. 2. Scientific feeding. At the initial stage of stocking, zooplankton (such as red worms) were mainly fed, and then gradually domesticated to floating particle bait, supplemented by night light bait. Feed requirements are fresh and not deteriorating, rich in nutrients and palatable in particle size. Baiting follows the principle of "four determinations". The daily feeding rate is 1.5%~3% when the water temperature is 20~30℃, and 0.5%~1.0% when the water temperature is below 20℃. Specific according to feeding conditions, weather, water quality and other timely high speed. The feeding times were 3 times a day, 07∶00~08∶00, 11∶00~12∶00 and 18∶00~19∶00 respectively. 3, timely box. The paddlefish grows very fast, so it should be cultivated in time to avoid polarization and improve the survival rate.

Frequent inspection box management 1, strictly implement the early, middle and late inspection box system carefully observe sturgeon feeding and activities, timely fishing and removal of residual bait. Regularly wash the net cage to prevent the mesh from blocking and affecting the exchange of water inside and outside the box. 2, to ensure the safety of the cage rainy days and stormy seasons, pay attention to strengthening the cage at any time. Also often check the cage for damage, found damage timely repair. Nets must be installed at the top of the cage black nylon fabric and anti-theft nets. 3. Make daily records. Record the temperature, water temperature, feeding amount and number of deaths every day. If abnormal conditions are found, timely measures shall be taken.

Prevention and control of duckbill disease adhere to the principle of "prevention first, health management". The seedlings were put into the cage after being immersed in 1%~2% salt or 0.4mg/L dibromohydantoin, and were sprinkled with 15mg/L quicklime and 0.3mg/L dibromohydantoin every 20 days. Prohibited drugs are strictly prohibited in the waters around the cage.

The cultivation of duckbill fish on the market also requires a lot of skills, such as the selection of its site and the setting of cages, which are very important for cultivation. Only by selecting the correct site can there be a suitable growth environment for fish, and only a reasonable selection of cages can better manage the growth of fish.