Area1~ 5 mu, water depth1.5 ~ 2 m. The bottom of the pool is flat, with little silt, no overgrown weeds and no leakage. A sinking feed platform is set along the pool edge, which is made of cement and bricks, and has a trapezoidal and gentle slope shape (temporary construction can also be made of sinking materials) with a slope of about15 ~ 30. , with an area of 4 ~ 6 m. L ~ 2 small ponds and 3 ~ 4 large ponds. The fish species in Xiatang have completely switched to compound feed, with uniform individuals, weight100 ~ 200 g/fish, feeding density of 350 ~ 650 fish/mu, minimum dissolved oxygen in the morning should not be less than 4 mg/L, and feeding should be done in a fixed position, quantity, quality and time. Throw it four times a day, and you can feed grass per mu in summer when water and fertilizer are available.

3 ~ 5 fish with 500g tail, silver carp eating phytoplankton transparency.

2.2.2.2 Farming

Without feeding, sturgeons use natural bait in ponds, such as shrimps, to grow with aquatic insects.

It is advisable to choose a grass-parent fish pond, the water is thin, the diurnal variation of deep dissolved oxygen is small, and the fish that do not need to be domesticated with compound feed or cannot be domesticated for one time are put into the pond, and it is advisable to stock 200 g fish per mu1~ 3 fish. Equipped with aerator, convenient water injection and drainage is required. The ponds with high yield of adult fish, silver carp and bighead carp cultivate plankton because of fertilization, and the dissolved oxygen in the ponds changes greatly day and night, so the Chinese sturgeon can't adapt, and the carp and crucian carp ponds compete with the sturgeon for food because of their similar recipes.

2.3 cage feeding

Cages can be set up in reservoirs, river bends and other waters with good water quality and no pollution, and the water depth should be greater than 5 m. Fish with 50 ~ 500 g/tail use 20 rTl2 cages, and large fish with more than 500 g/tail use 60 m2 cages. The size of the net depends on the size of the fish species, and it is advisable not to escape the fish. It is better to use two layers of cage clothes. The depth of cage entry is generally 2 m, and it can reach 3m when the water temperature is high in July and August. There is a bait table in the cage. Generally, single feeding is the main method, and several bream and snakehead can also be fed together to clean the netting. It is advisable to put more than 50 g per fish, and it is best to put about 200 g per fish. The water temperature should be15 ~16℃ when entering the box, and the fry with stocking density of 50 ~100g/tail should be put in 30 ~ 20/box and100 ~ 500g/tail should be put in 20 ~15. Because the Chinese sturgeon bone plate is sharp, it swims frequently and consumes a lot of energy.

The oxygen rate is high, the utilization of water body is mainly plane, and its feeding density should be lower than other kinds.

Feeding and management: a small number of times, 6 times a day, 3 ~ 4 times if it is inconvenient, the feeding rate is generally 3 ~ 4% of the body weight, and it is adjusted according to the growth, food intake and water temperature of the fish. Regularly check and clean the algae and dirt attached inside and outside the cage, and wash the cage at least once every two months. Change the direction of motion Speed up when you are frightened, and even jump out of the water.

Artificial feeding method for adult fish

2.1Precautions

1.1zhuanshi

Chinese sturgeons of various sizes ranging from 3 to 300 g are customarily called sturgeon species. After the fry are cultivated to a total length of about 10cm and a weight of 3-5 kg, they can enter the feeding of sturgeons of 0-year-old. The key of this period is the feeding of compound feed, that is, the process that the fry change from feeding fresh food (water earthworm, water flea and bumper worm) to feeding compound feed. The size of the food-switching species is generally 2 ~ 250 g, and the food-switching time is determined according to the supply of live bait and the feeding water temperature. If the supply of live bait is sufficient, it can be fed larger before feeding, and the water temperature should be15 ~16℃ when feeding. There are many kinds of feed used for food conversion. Sturgeon likes to eat soft and smooth feed, and the soft pellet feed with comprehensive nutrition and good palatability can be converted quickly. It only takes three days to domesticate, and most sturgeons can eat normally, with a conversion rate of 95%. However, it takes 5 ~ 7 days to switch to semi-wet pellet feed and 8 ~ for hard pellet feed.

10d, and the food conversion rate was 75 ~ 95%. Adding a certain amount of earthworm to the feed during the feeding transition period can improve the feeding attraction effect of the feed.

Feeding rate

When the dissolved oxygen drops below 3 mg/L, feeding is prohibited, and sturgeons do not eat. Before the thunderstorm, the air pressure was low, the weather was sultry, and the temperature plummeted when the cold wave came. When the water temperature is14 ~17℃, the suitable feeding rate of juvenile sturgeons weighing 3 ~ 40g is 5% of their body weight, and when the water temperature is 13-15℃, the feeding rate of juvenile sturgeons weighing 70-140g is the same.

Appropriate, eating slowly, with a small amount of multiple times is appropriate. When the water temperature is lower than 14℃ or higher than 28℃, the feeding amount should be reduced. After feeding to more than 500g, it can be gradually converted into adult sturgeon feed or adult eel and turtle feed. The feed coefficient of compound feed is generally 0.8 ~1.8, and that of natural feed is 8 ~15.

water quality

Sturgeon is more demanding on water quality than other fish. It is required that the water inlet and outlet are separated and convenient, the water source is sufficient, the water quality is clean and thin, which meets the water quality requirements of freshwater fishery and sturgeon feeding requirements in China, the transparency is greater than 50 c/LQ, and the dissolved oxygen is greater than 6ppm. An aerator is required.

2.2 Feeding methods

Cement pond feeding

The water temperature is suitable, and the outdoor pool needs shading net and aerator. In order to facilitate management and observation, the feeding pond for young and young sturgeon should be smaller and shallower. As the fish grow up, the area of the pond will gradually increase and the depth of the water will gradually increase. The area of the cement pond for feeding sturgeon larvae (just hatched below 5 em) is generally below 10 square meter, and the water depth is 0.5 ~ 0.7 m; Juvenile sturgeon pond (1~100g/tail)10 ~ 30m2, with water depth of 0.6 ~ 0.8m; 1~ 2-year-old fish (100 ~ 5000 g/tail) pond is 30 ~120 square meters, and the water depth is 0.8 ~1.om; Adult fish (above 5000 g/tail)120 ~ 250 m2, water depth1~1.5m. The pool is covered with black.

Optical network. Generally, it drains water from the upper side to the lower side. The shape of the pool is round, square and rectangular. The round pool is convenient for automatic sewage discharge and management. The bottom of the pond is required to be smooth, with a slope of 2 ~ 5% from the bottom to the sewage outlet. Box-shaped or column-shaped fish-catching facilities are set at the drain, and the bottom of the pond should be close to the natural color. Equipped with aerator 1 set/／200mz, keep the dissolved oxygen above 6ppm and the transparency above 50cm. Feeding density is 0.5 ~1kg/tail, 30 ~ 20/m2; 2 ~ 3 kg/tail10 ~ 5 tail/m2, 4 ~ 5 kg/tail and 3 ~ 2 tail/m2.

Soil pond feeding

Monoculture

Area1~ 5 mu, water depth1.5 ~ 2m. The bottom of the pond is flat, with little silt, no overgrown weeds and no leakage. Sinking feed tables are set along the edge of the pond, which are made of cement and bricks. They are trapezoidal and gentle slope (temporary ones can also be built with sinking materials), with a slope of about15 ~ 30, covering an area of 4 ~ 6 square meters, with 1 ~ 2 small ponds and 3 ~ 4 large ponds. The fish species in Xiatang have completely switched to compound feed, with uniform individuals, weight100 ~ 200 g/fish, feeding density of 350 ~ 650 fish/mu, minimum dissolved oxygen in the morning should not be less than 4 mg/L, and feeding should be done in a fixed position, quantity, quality and time. Throw it four times a day, and you can feed grass per mu in summer when water and fertilizer are available.

3 ~ 5 fish with 500 g tail, silver carp eating phytoplankton transparency.

Intercropping

Without feeding, sturgeons use natural bait in ponds, such as shrimps, to grow with aquatic insects. It is advisable to choose a grass-parent fish pond, the water is thin, the diurnal variation of deep dissolved oxygen is small, and the fish that do not need to be domesticated with compound feed or cannot be domesticated for one time are put into the pond, and it is advisable to stock 200g fish per mu1~ 3 fish. Equipped with aerator, convenient water injection and drainage is required. The ponds with high yield of adult fish, silver carp and bighead carp cultivate plankton because of fertilization, and the dissolved oxygen in the ponds changes greatly day and night, so the Chinese sturgeon can't adapt, and the carp and crucian carp ponds compete with the sturgeon for food because of their similar recipes.

Cage feeding

Cages can be set up in reservoirs, river bends and other waters with good water quality and no pollution, and the water depth should be greater than 5 m. Fish with 50 ~ 500 g/fish use 20 rTl2 cages, and large fish with 500 g/fish use 60 square meters cages. The size of the net depends on the size of the fish species, and it is advisable not to escape the fish. It is better to use two layers of cage clothes. The depth of cage entry is generally 2m, and it can reach 3m when the water temperature is high in July and August. There is a bait table in the cage. Generally, single feeding is the main method, and several bream and snakehead can also be fed together to clean the netting. It is advisable to put more than 50g fish species per tail, and it is best to put about 200g fish species per tail. The water temperature should be15 ~16℃ when entering the box, and the fry with stocking density of 50 ~100g/tail should be put in 30 ~ 20/box and100 ~ 500g/tail should be put in 20 ~15. Because the Chinese sturgeon bone plate is sharp, it swims frequently and consumes a lot of energy.

The oxygen rate is high, the utilization of water body is mainly plane, and its feeding density should be lower than other kinds.

Feeding and management: a small number of times, 6 times a day, 3 ~ 4 times if it is inconvenient, the feeding rate is generally 3 ~ 4% of the body weight, and it is adjusted according to the growth, food intake and water temperature of the fish. Regularly check and clean the algae and dirt attached inside and outside the cage, and wash the cage at least once every two months.