What should be paid attention to when cultivating Sturgeon seedlings?

With the vigorous rise of Sturgeon culture, the price of commercial Sturgeon continues to fall, and the profit margin is getting smaller and smaller. Improving the survival rate of Sturgeon seedlings is one of the main means to increase profits in Sturgeon culture. The cultivation of Sturgeon in the south generally needs to be domesticated to the south, which has special requirements for the ecological conditions, culture facilities and basic operation and management of the culture site. According to the lessons and experience of breeding Sturgeon in recent years, the author talks about some technical points in the stage of Sturgeon seedling cultivation.

Water quality requirements

The basic requirements for water quality of Sturgeon fingerling rearing are as follows: pH is 6505m / L, dissolved oxygen is more than 60.0mg / L, total iron content is less than 0.08mg / L, Nonionic ammonia is less than 0.02mg / L, nitrite is less than 0.05mg / L. Each farm should treat the water quality properly according to the condition of its own water source and the basic water quality requirements of Sturgeon above. If the water source is well water, it shall mainly monitor whether the total iron content exceeds the standard; if the water source is river water, especially the river water with pollution sources, it shall mainly monitor whether the content of suspended solids and ammonia nitrogen exceeds the standard; if the water source is stream water, it shall mainly monitor whether the pH value is too low; if it exceeds the standard, well water and river water can be well treated by aeration plus quartz sand filtration; the slightly acidic stream water can be adjusted with quicklime.

Production facilities

The newly built Sturgeon fingerling culture pond generally requires the construction of a running water fish culture pond. the area of the pond is 0 square meters, the depth of the pond is 0 square meters, the shape of the pond is round, the bottom of the pond is pot-shaped, and there is a drainage outlet in the middle for sewage discharge; the water inlet is located at the top of the pond, showing a flute tube shape. The bottom of the cultivation pool in the splash stage should be smooth, if the bottom of the cement pool should be tiled. If conditions permit, inflatable aeration facilities can be set up in the pool.

Spray quality

Spray quality is one of the factors affecting the survival rate of Sturgeon fingerling. Therefore, when purchasing Sturgeon spray, aquaculture owners should pay attention to spray quality. Good quality water spray should swim up and down actively in the water two days after film removal, and there are few fish fry lying at the bottom for a long time, so the survival rate of Sturgeon spray transport is high, and it has strong ability to adapt to the environment in the process of cultivation.

Daily management

1. Stocking density: Sturgeon spray from the dormant period to the early opening stage, the stocking density in general running fish ponds is 3000M5000 / m2, and can be adjusted to 2000 / m2 after opening. With the continuous growth of seedling specifications, the stocking density should be reduced in time.

2. Discharge: at least once a day, the fine glue tube siphon method can be used in the juvenile period, and running water can be used to discharge automatically in the juvenile period.

3. Water change: although the cultivation pond is designed as a running pool, the water flow can not be very large in the seedling cultivation stage, so it is still necessary to change the water once a day, which is 2/3 of the pool water.

4. Feeding: the opening bait of all kinds of Sturgeon is generally water earthworms, and the effect of using harvest insects as opening bait is also better. Water earthworms were washed with water before feeding, then disinfected with furazolidone (3ppm) or potassium permanganate (10ppm), then chopped and fed. The feeding times are 8 times per day, and the feeding amount is 40%, 50% of the body weight of the fish.

5. Water temperature: the water temperature of Sturgeon fingerling should be controlled at 18 ℃ 25 min.

Prevention and treatment of common diseases

1. Bubble disease: the main symptom of the disease is that the abdominal cavity of fish fry is inflated and swelled, floating on the water surface to do irregular movement, which will not cause large-scale death. The treatment is to sprinkle salt in the water to make the pool water at a concentration of 0.5%.

2. Enteritis: the main symptoms are blackening of the fish, traveling alone, dissection shows intestinal and anal congestion, there is no food in the intestine, and large-scale death can be caused by no timely treatment. Treatment can be treated with furazolidone (20 mg per kilogram of fish per day) mixed with food for 5 days.

3. Red mouth disease: the main symptoms are redness and swelling around the fish mouth, it is difficult to eat, and it is easy to cause death. You can sprinkle the whole pool with ciprofloxacin to make the pool water 1ppm concentration, and the effect is better.

4. Rotting tail disease: the main symptoms are rotten tail fins of diseased fish, sometimes accompanied by pectoral fin ulceration, high infection rate and easy death. Furazolidone can be used to sprinkle the whole pool to make the pool water 3ppm concentration.