CATDOLL : CATDOLL: How to prepare the sturgeon compound feed for acclimatization?

1. How to prepare the feed for domestication of sturgeon?

The feed used for domestication is a special feed for sturgeons, with a feed particle size of about 0.2 to 0.3 mm. This pellet feed is used as the basic raw material, and some other substances are added to make soft pellet feed for domestication and feeding, which has a relatively ideal effect. Usually, a certain proportion of eel feed, soybean oil, fresh pork liver or some attractant substances such as Daphnia dry powder and betaine are added to the basic feed. The added eel feed mainly acts as an adhesive and has a certain effect on attracting food. The addition of soybean oil is about 5%, which can increase the fat content in the feed and increase the absorption and utilization of fat-soluble vitamins by the fry; fresh pork liver contains rich active enzyme substances, which is conducive to the digestion and utilization of various nutrients in the feed by the fry, and the addition amount is generally 20% to 30%.

After mixing these additives, they are made into larger soft particles, which are then rubbed through a 16-mesh screen to form micro particles. After they are half-dried, they can be used for feeding. Another method is to soak hard granular feed in live bait slurry (such as earthworms) to form soft particles, and then feed them after they are half-dried. The soft granular feed made by these methods is easier for fry to accept, and its domestication effect is significantly improved.

The test results show that soft pellets made of fresh live animals can be fed for 3 weeks, with a survival rate of over 50%. The survival rate of soft pellets made of fresh pig liver and fresh earthworms is even higher, reaching about 69%. The survival rate of soft pellets made of live bait slurry (such as slurry made of crushed earthworms) is over 75% after being soaked in live bait slurry for about 2 weeks.

2. How to make feed for sturgeon domestication?

The feed used for domestication is a special feed for sturgeon, with a feed particle size of about 0.2-0.3 mm. This pellet feed is used as the basic raw material, and some other substances are added to make soft pellet feed for domestication and feeding, which has a relatively ideal effect. Usually, a certain proportion of eel feed, soybean oil, fresh pork liver or some attractant substances such as Daphnia dry powder and betaine are added to the basic feed. The added eel feed mainly acts as an adhesive and also has a certain effect on attracting food. The addition of soybean oil is about 5%, which can increase the fat content in the feed and increase the absorption and utilization of fat-soluble vitamins by the fry; fresh pork liver contains rich active enzyme substances, which is beneficial to the digestion and utilization of various nutrients in the feed by the fry, and the addition amount is generally 20%-30%.

After mixing these additives, they are made into larger soft pellets, which are then rubbed through a 16-day screen to form micro-pellets. After they are half-dried, they can be used for feeding. Another method is to soak hard pellet feed in live bait slurry (such as earthworms) to form soft pellets, and then feed them after they are half-dried. The soft pellet feed made by these methods is easier for fry to accept, and its domestication effect is significantly improved. The test results show that the soft pellet feed made by adding fresh live things can be fed in 3 weeks, and the survival rate is above 50%.

If soft pellet feed made of fresh pork liver and fresh earthworms is added for domestication, the survival rate will be even higher, reaching about 69%; while if soft pellet feed made of live bait slurry (such as slurry made from crushed earthworms) is soaked for feeding, the domestication time will be about 2 weeks, and the survival rate will be as high as over 75%.

3. What is the method of domesticating sturgeon with compound feed?

When using compound feed to domesticate sturgeons, in order to make the young fish get used to artificial feed as soon as possible, a certain amount of feed must be fed and the number of feedings must be set. The number of feedings is usually about 10 times a day, and in the later stage it can be reduced to 5-6 times depending on the young fish's acceptance of the feed. During the domestication period, it is best to clean the pond after each feeding. In large-scale aquaculture production, the pond should be cleaned at least 1-2 times a day to keep the water environment in the pond stable and good.

Alternating feeding can also be used. Alternating feeding refers to gradually increasing the number of pellet feed feedings during daily feeding during domestication. When domestication begins, add one pellet feed feeding per day, and the number of live bait feedings should be reduced accordingly. The time interval between pellet feed feeding and the adjacent live bait feedings should be appropriately extended. When feeding pellet feeds, it should be done at the time when the young fish are most active in feeding, generally around 5-6 in the morning and around 7 in the evening. After a few days of alternating feeding, increase the number of pellet feed feedings and reduce the number of live bait feedings, and gradually transition to feeding live bait once a day, once every three days, and finally not feeding live bait at all.

The domestication of sturgeon fry by alternating feeding takes a long time, about 7-8 weeks, and the survival rate can reach more than 50%-60%. In the large-scale production of crocodiles, this domestication method is generally used, and the effect is relatively stable.

4. What are the key points in the preparation and management of fish ponds for acclimatization of sturgeon compound feed?

After careful cultivation during the opening period, when the size of the fry reaches about 1 gram, they can be domesticated with compound feed. Domestication should also be carried out in the nursery pond, with a water temperature of 19-22 degrees and a water level of about 40 cm. The water supply should be sufficient, generally maintained at 30-40 liters per minute. At this time, the size of the fry is slightly larger and the physique is enhanced. The water in the nursery pond can maintain a certain flow or rotation depending on the situation to facilitate sewage discharge. At the beginning of domestication, the stocking density of fry can be adjusted to about 2,000 fry/square meter, and the mesh of the interception net is changed to 16 mesh. In the later stage, 12 mesh nets can be used. During the domestication period, the amount of feed is large and there is a lot of residual feed. The pond should be cleaned in time, and it is best to remove the residual feed in time every time it is fed. In large-scale production, this work is difficult to do, but it is also necessary to insist on at least 1-2 times a day to prevent the residual feed or dead fry from rotting and deteriorating, deteriorating water quality, and causing fish diseases. Secondly, the fish body should be disinfected regularly, such as bathing the fish body with 1%-2% salt water once a week for 4-5 minutes each time (the length of time depends on the condition of the fry). The fish pond should be disinfected before the fry are transferred to the pond.

5. How to prepare and manage the fish pond for the domestication of sturgeons with compound feed?

After careful cultivation during the opening period, when the size of the fry reaches about 1 gram, they can be domesticated with compound feed. Domestication should also be carried out in the nursery pond, with a water temperature of 19 ~ 22℃ and a water level of about 40 cm. The water supply should be sufficient, generally maintained at 30 to 40 liters per minute. At this time, the size of the fry is slightly larger and the physique is enhanced. The water in the nursery pond can be kept flowing or rotating to facilitate sewage discharge. At the beginning of domestication, the stocking density of fry can be adjusted to about 2000 tails/square meter, and the mesh of the intercepting net is changed to 16 mesh. In the later stage, 12 mesh nets can be used. During the domestication period, the amount of feed is large and there are many residual feeds. The pond should be cleaned in time, and it is best to remove the residual feed in time every time it is fed. In large-scale production, this work is difficult to do, but it should be insisted on at least 1 to 2 times a day to prevent the residual feed or dead fry from rotting and deteriorating, deteriorating the water quality, and causing fish diseases. Secondly, the fish body should be disinfected regularly, such as bathing the fish body with 1% to 2% salt water once a week for 4 to 5 minutes each time (the duration depends on the condition of the fry). Before the fry are transferred to the pond, the fish pond must be disinfected before the fry are added.