Feeding methods of sturgeon. Is the cage setting specification 5 meters? Five meters, four meters? 4 meters, the net is polyethylene, and the mesh size depends on the specifications of sturgeon species. Based on the principle of not running fish, being beneficial to water exchange and not leaking bait from the bottom net, the water quality is selected for cage setting.
sturgeon
Where the water depth is more than 8 meters, it should also have the conditions of micro-flow, shelter from the wind, facing the sun and wide water surface. Large reservoirs should choose suitable bays to set cages, and small reservoirs should choose places not far from the dam.
Second, the cage was erected in mid-April, and the net clothes did not feel rough after being soaked in the reservoir water, which reduced the chance that the fish in the box were scratched by the net clothes due to environmental changes. The suitable stocking time is in the middle and late April, and the water temperature is about 10- 15℃, which is the best growth temperature of sturgeon. The larger the stocking specification, the better, generally 75- 150g/ tail, and the stocking density is 40-50 tail /m2. Fish are disinfected with 3%-4% salt water before entering the box, and the temperature difference between transport water and reservoir water is not more than 5℃.
3. Feed can be artificially mixed with granular materials, and the content of protein should be 42%-45%. The main raw materials are fish meal, yeast, blood meal, wheat, corn, silkworm chrysalis and so on. The stability of granular substances in water should be high, and it should be kept for more than half an hour. Fish should stop feeding for 2-3 days after entering the box to let the fish adapt to the environment. Start feeding after 2-3 days, and feed for many times at the beginning. The particle size of bait should be adjusted in time with the increase of fish body to achieve palatability. Feed sturgeon once every morning, noon and evening. Sturgeon has the habit of feeding at night, and the daily feeding amount is 2%-4% of the fish weight in the box. The feeding amount depends on the weather, water temperature and the feeding situation of the fish.
Fourth, the daily management should be guarded by special personnel, and unpacking inspection should be carried out in the morning, middle and evening. After feeding the fish for one hour at a time, you should lift the box to check the eating situation and adjust the feeding amount; If there are floating dead fish in the box, check the box and fish out the sick and dead fish in the box. Clean the cage every 10 day, remove impurities and excessive algae attached to the net clothing, keep the water exchange inside and outside the box smooth, and adjust the density in time with the growth of fish. Change the cage once a month, using the cage-nesting method, that is, soak the cage to be replaced for 2-3 days, then fix it outside the cage containing the sturgeon to be replaced, and then carefully untie the cage to be replaced and pull it out of the water. Rinse and repair the replacement cage. When entering the high temperature season, we should pay attention to avoid throwing fish to avoid losses.
5. Soak the fish disease prevention cage with quicklime or bleaching powder before launching, and launch the water 7- 10 in advance. Soak the fish in 3%-4% salt solution 10- 15 minutes before entering the cage, use 2-3kg of quicklime for each box every 15-20 days, and sprinkle water on the box and nearby waters. During disinfection, lift the four corners of the cage to reduce the water body, increase the drug concentration, observe the stress reaction, and put down the four corners when stress occurs. Sturgeon cultured in pond is a kind of large fish with fast growth, strong disease resistance and strong adaptability, which is suitable for pond culture.
Pay attention to the following questions.
1. Pond conditions The sturgeon culture pond requires a large area, sufficient water depth, fresh and pollution-free water quality, convenient transportation and complete communication facilities. The pond covers an area of 5- 10 mu, with a water depth of 2-3 meters. The water quality is stable and the dissolved oxygen value of the water body is high, preferably above 5 mg/L. The pond should have an independent inlet and outlet with a slope, equipped with a water wheel aerator and a feed table.
2. Flooding the pond with 15-20cm half a month before disinfection and seedling release, and sprinkling 100- 150kg/ mu of quicklime in the whole pond to eliminate harmful organisms in the water; After soaking for 3-4 days, drain the pool water out of the pool, then soak the bottom of the pool with water, and filter the water inlet with a 60-mesh screen; Clean and disinfect the pond with1.5-20kg/mu tea seed cake. Before disinfection, break the tea seed cake, soak it in water for 1 day, and then sprinkle it all over the pond to kill fish and shrimp and fish and shrimp eggs. After cleaning the pond, tea bran is left as fertilizer in the pond. 10 before sowing, add water to the pond to a depth of 70-80 cm, and then disinfect it with chlorine-containing disinfectant.
3. 7-8 days before cultivating plankton and releasing seedlings, prepare 50 kilograms of dry chicken manure per mu of pond and soak the chicken manure for 2 days. It is best to disinfect with chlorine-containing disinfectant, then remove impurities (filter) and sprinkle all over the pond. After the filter is wrapped in a fiber bag, it is placed in the downwind of the pond and continues to be used as a fertilizer for cultivating plankton.
Four, fry stocking choose healthy sturgeon fry with a body length of more than 20 cm. Generally, the stocking density of large-sized fry is 400-600 fish per mu. When releasing seedlings, we should not only consider the appropriate water temperature, but also consider the listing of adult fish. Feeding should be stopped 1-2 days before seedling transportation, 38? 82. Add 3/5 water into the bag, adjust the water temperature to 12- 15℃ with ice cubes, put 20 fish fry with a body length of 20-30cm in each bag, and pack them and transport them. If the transportation time is less than 8 hours, it can be transported by water truck, but the change of water temperature should be paid attention to at all times during transportation, and the effect is also good. Water should be tested two days before the fry are released, and about 10 fry of the same specification should be put into the cage to observe the activity of sturgeon. If there is no abnormality, the fry can be released. When placing seedlings normally, don't unpack the arrived seed bag first, but put the whole bag into the pond, slowly make the water temperature in the bag close to the water temperature in the pond, and then open the bag mouth to put the seeds into the pond. In a conditional farm, it is best to pour the fish together with water into a vat to keep continuous aeration, then put salt in the vat to make the salinity reach 2%, soak the fish for 10 minutes and then put it into the pond.
Five, feed feeding pond farming is mainly based on feeding compound feed, sturgeon fry just got off the pond, has not yet formed the habit of feeding in a fixed place, and should be domesticated in time.
Feed can be placed on the feed table, which improves the feed utilization rate and facilitates daily observation. Some sturgeons, such as sturgeon, hybrid sturgeon, Russian sturgeon, Chinese sturgeon and so on. , has the characteristics of phototaxis at night, and can be illuminated near the feed table when domesticated at night. Feeding should adhere to the principle of a small amount of meals, feed should be palatable, and the particle size should not be too large or too small. Generally, it is better to use 1/2 with a cracked fish mouth. The feeding amount is about 3% of the fish weight, and it is fed 3-4 times a day, and the feeding amount can be adjusted at any time according to the specific situation.
Six, daily management patrol pond and growth observation. Patrol the pond once every morning, noon and evening, especially at night and early morning, pay attention to the activities of fish to prevent hypoxia; In the summer rainy season, when the solar terms are low, it is necessary to patrol the pond frequently and take timely measures such as turning on the aerator or adding new water to prevent flooding. Check the growth and health of sturgeon regularly, adjust the feeding rate and stocking density in time, and divide the sturgeon into ponds in time according to its specifications when the growth difference in the pond is too large. In water quality management, water temperature should be measured three times a day, and physical and chemical factors such as pH value, dissolved oxygen, nitrite and ammonia nitrogen should be measured regularly. It is worth noting that sturgeon is a typical benthic fish and generally does not float. Some species, such as Chinese sturgeon, will not float as obviously as domestic fish even if the dissolved oxygen in the water is insufficient. Therefore, it is necessary to strengthen the monitoring of water quality and measure dissolved oxygen in water every morning under special circumstances such as excessive water temperature, incorrect water color or sultry weather. When the water color in the pond is too strong, the water transparency is less than 25 cm or the dissolved oxygen is less than 5 mg/L, the pond should be filled with fresh water to keep the water fresh. The optimum pH value for sturgeon growth is 6.5-8.0. Too low pH will affect the metabolic activity and growth of sturgeon, and even endanger life. The upper limit of the survival temperature of most sturgeons is 32℃, and the water temperature exceeding 30℃ is dangerous to the growth of sturgeons. The water temperature control can refer to the following measures: selecting appropriate stocking time, releasing large fish species and shortening the breeding cycle; Strive to release large fish species after the high temperature period every year, and reach the standard before the high temperature period next year to avoid high temperature; When the high temperature period comes, deepen the water level and reduce the stocking density; Where conditions permit, measures such as increasing water exchange and building shade sheds can also be taken.
Seven, the symptoms of disease prevention and treatment of mycosis are slow movement, thin fish, and no feeding. The prevention method is to prevent fish from being injured. The sick fish can be soaked in the mixed solution of clotrimazole, 1% salt and baking soda water for about 10 minutes.
Matters needing attention in sturgeon culture 1. Pond conditions The sturgeon breeding pond requires a large area, sufficient water depth, fresh water and pollution-free areas, convenient transportation and complete communication facilities. The pond covers an area of 5- 10 mu, with a water depth of 2-3 meters. The water quality is stable and the dissolved oxygen value of the water body is high, preferably above 5 mg/L. The pond should have an independent inlet and outlet with a slope, equipped with a water wheel aerator and a feed table.
2. Flooding the pond with 15-20cm half a month before disinfection and seedling release, and sprinkling 100- 150kg/ mu of quicklime in the whole pond to eliminate harmful organisms in the water; After soaking for 3-4 days, drain the pool water out of the pool, then soak the bottom of the pool with water, and filter the water inlet with a 60-mesh screen; Clean and disinfect the pond with1.5-20kg/mu tea seed cake. Before disinfection, break the tea seed cake, soak it in water for 1 day, and then sprinkle it all over the pond to kill fish and shrimp and fish and shrimp eggs. After cleaning the pond, tea bran is left as fertilizer in the pond. 10 before sowing, add water to the pond to a depth of 70-80 cm, and then disinfect it with chlorine-containing disinfectant.
3. 7-8 days before cultivating plankton and releasing seedlings, prepare 50 kilograms of dry chicken manure per mu of pond and soak the chicken manure for 2 days. It is best to disinfect with chlorine-containing disinfectant, then remove impurities (filter) and sprinkle all over the pond. After the filter is wrapped in a fiber bag, it is placed in the downwind of the pond and continues to be used as a fertilizer for cultivating plankton.
Four, fry stocking choose healthy sturgeon fry with a body length of more than 20 cm. Generally, the stocking density of large-sized fry is 400-600 fish per mu. When releasing seedlings, we should not only consider the appropriate water temperature, but also consider the listing of adult fish. Feeding should be stopped 1-2 days before seedling transportation, 38? 82. Add 3/5 water into the bag, adjust the water temperature to 12- 15℃ with ice cubes, put 20 fish fry with a body length of 20-30cm in each bag, and pack them and transport them. If the transportation time is less than 8 hours, it can be transported by water truck, but the change of water temperature should be paid attention to at all times during transportation, and the effect is also good. Water should be tested two days before the fry are released, and about 10 fry of the same specification should be put into the cage to observe the activity of sturgeon. If there is no abnormality, the fry can be released. When placing seedlings normally, don't unpack the arrived seed bag first, but put the whole bag into the pond, slowly make the water temperature in the bag close to the water temperature in the pond, and then open the bag mouth to put the seeds into the pond. In a conditional farm, it is best to pour the fish together with water into a vat to keep continuous aeration, then put salt in the vat to make the salinity reach 2%, soak the fish for 10 minutes and then put it into the pond.
Five, feed feeding pond farming is mainly based on feeding compound feed, sturgeon fry just got off the pond, has not yet formed the habit of feeding in a fixed place, and should be domesticated in time. Feed can be placed on the feed table, which improves the feed utilization rate and facilitates daily observation. Some sturgeons, such as sturgeon, hybrid sturgeon, Russian sturgeon, Chinese sturgeon and so on. , has the characteristics of phototaxis at night, and can be illuminated near the feed table when domesticated at night. Feeding should adhere to the principle of a small amount of meals, feed should be palatable, and the particle size should not be too large or too small. Generally, it is better to use 1/2 with a cracked fish mouth. The feeding amount is about 3% of the fish weight, and it is fed 3-4 times a day, and the feeding amount can be adjusted at any time according to the specific situation.
Six, daily management patrol pond and growth observation. Patrol the pond once every morning, noon and evening, especially at night and early morning, pay attention to the activities of fish to prevent hypoxia; In the summer rainy season, when the solar terms are low, it is necessary to patrol the pond frequently and take timely measures such as turning on the aerator or adding new water to prevent flooding. Check the growth and health of sturgeon regularly, adjust the feeding rate and stocking density in time, and divide the sturgeon into ponds in time according to its specifications when the growth difference in the pond is too large. In water quality management, water temperature should be measured three times a day, and physical and chemical factors such as pH value, dissolved oxygen, nitrite and ammonia nitrogen should be measured regularly. It is worth noting that sturgeon is a typical benthic fish and generally does not float. Some species, such as Chinese sturgeon, will not float as obviously as domestic fish even if the dissolved oxygen in the water is insufficient. Therefore, it is necessary to strengthen the monitoring of water quality and measure dissolved oxygen in water every morning under special circumstances such as excessive water temperature, incorrect water color or sultry weather. When the water color in the pond is too strong, the water transparency is less than 25 cm or the dissolved oxygen is less than 5 mg/L, the pond should be filled with fresh water to keep the water fresh. The optimum pH value for sturgeon growth is 6.5-8.0. Too low pH will affect the metabolic activity and growth of sturgeon, and even endanger life. The upper limit of the survival temperature of most sturgeons is 32℃, and the water temperature exceeding 30℃ is dangerous to the growth of sturgeons. The water temperature control can refer to the following measures: selecting appropriate stocking time, releasing large fish species and shortening the breeding cycle; Strive to release large fish species after the high temperature period every year, and reach the standard before the high temperature period next year to avoid high temperature; When the high temperature period comes, deepen the water level and reduce the stocking density; Where conditions permit, measures such as increasing water exchange and building shade sheds can also be taken.
Seven, the symptoms of disease prevention and treatment of mycosis are slow movement, thin fish, and no feeding. The prevention method is to prevent fish from being injured. For sick fish, clotrimazole and mixed solution of 1% salt and baking soda water can be used to soak sick fish for about 10 minutes.