American paddlefish cage high-yielding culture technology

In order to develop paddlefish breeding, optimize the structure of aquaculture species, and improve the comprehensive fish culture effectiveness 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 aquaculture experiments, good production and economic benefits have been achieved: the average output has reached 9.15 kg/sq.m., which is equivalent to 6100 kg/mu. The specifications have reached 450~750 g/tail; the net profit per square meter has reached 452.7 yuan. The input-output ratio is 1:2.22. Paddlefish cage high-yield culture techniques are summarized below.

First, site selection and cage settings

(i) Selection of farms: The farms were selected in some Kuwan, Qiandao Lake, Pan’an County. The aquatic environment of the breeding area is excellent, with large water surface, rich dissolved oxygen, water depth of more than 8 meters, good water quality, and the water quality meets the standards of GB11607.

(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 64m. Mesh size 2a = 1.0-2.5 cm.

Second, the main technical measures

(i) Seed selection and stocking: Choose good-quality seed with robust physique, lively swimming, neat specifications, and no disease or injury. Stocking density is 20-40/m2. According to the characteristics of paddlefish seedlings that 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, and should be adjusted as consistent as possible. Before entering the box, use 1.5%-2.0% saline solution to disinfect the fish for 8-10 minutes.

(B) Scientific Feeding: Cage culture paddlefish large-scale species, with emphasis on feeding. 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%. According to food conditions, weather, water quality and other timely adjustments. 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) daily management

1. Careless Tour Case: Strictly implement the early, middle and late-night inspections system, carefully observe the feeding and activities of the carp, and remove the residue and leftover bait in time. Net cages are often washed to prevent plugging of mesh and affect the exchange of water inside and outside the cage.

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. Breeding net mouth also install black shading nylon cloth and security net.

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 management”. The seedlings are stocked and each time they are binned, they are put into the tank with salt and dibromohydantoin, and every 15 days they are disinfected with 15ppm quicklime and 0.3ppm dibromohydantoin in the cage. Illegal drugs are strictly prohibited in the waters surrounding the cages.

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