The duck-billed fish is a cartilaginous fish with an exposed, moist, scale-less body and a spoon-shaped snout, resembling a duck's bill, so it is also called duck-billed sturgeon. Its snout is particularly long, flat and pulp-like; its body surface is smooth and scaleless, and its back is black-blue-gray, often with some spots in between. Wholesale price of paddlefish: 36~40 yuan/kg.

The sides of the body are dotted ocher, and the abdomen is white; the mouth is large and the eyes are small, and the forehead is higher than the mouth; the gill rakers are dense and slender, the operculum is large and extends backward to the pelvic fin, the caudal fin is bifurcated, and the tail The handle is covered with stalk-like nail scales. The paddlefish is larger and has a lifespan of more than 30 years. The gonads of paddlefish mature relatively late, and they generally do not reach sexual maturity until they are over 8 years old. The feeding habits of the paddlefish are similar to the bighead carp in my country. They feed on zooplankton and are filter-feeding fish.

Refer to silver carp cages for cage setting, choose waters with abundant plankton, require stable water flow, shelter from wind and sunshine, and quiet environment. The cage frame adopts a simple moso bamboo frame. The box material is polyethylene knotless mesh. The size of the cage is 5m5m2.5m, and the mesh size is 2.5cm. The paddlefish is afraid of light, so the surface of the cage is covered with a black film.

Choose high-quality seedlings that are strong, active, neat, disease-free and injury-free. The stocking density is 20 to 40 animals per square meter. The size is 10~15cm. According to the characteristics of paddlefish seedlings being sensitive to changes in water temperature, the temperature difference should not be too large when the seedlings are put into the box. It is advisable not to exceed 2℃, and the temperature should be adjusted as consistent as possible. Use 1.5~2.0 salt water to disinfect the fish body for 8~10 minutes before entering the box.