What is the value requirement for nitrite nitrogen in Penaeus vannamei shrimp

The organic nitrogen in the water body is mainly to share how to prevent nitrite in the water body of the shrimp pond.

On the high side. 1. Reasonable feeding, the temperature of winter shed breeding is relatively low, and the feed is relatively small, and then feed after the feed table is eaten up every time. Eat small meals often to avoid ammonia nitrogen in the water caused by the waste of bait.

and nitrite elevations. Experiments have proved that adding 1 kg of Ulanbao per ton of feed can improve the utilization rate of shrimp feed protein, reduce the feed coefficient by 11%, reduce the emission of organic nitrogen in the water body, and greatly slow down the growth rate of nitrite from the root.

2. The light in the winter shed breeding room is insufficient, and the algae.

The ability to deplete organic nitrogen is reduced due to insufficient activity. Need to use some photosynthetic bacteria.

and spore bacteria and other periodically to reduce the nitrite of the water body.

3. In the case of bad weather and insufficient care, some oxygenators can be put into the water body to reduce the anaerobic metabolism of the water body and reduce the growth rate of nitrite.

4. Regularly check the substrate to prevent the substrate from deteriorating. The deterioration of the bottom quality of the shrimp pond not only produces a lot of toxic substances, but also consumes a large amount of oxygen, resulting in a lack of oxygen at the bottom of the shrimp pond. In the absence of oxygen, nitrite can easily increase.

Shrimp farming in winter sheds is limited by the environment, the purification capacity of the water body is reduced, and the nitrite of the water body is often in a very high state. The key is to ensure the dissolved oxygen content of the water body and prevent and inhibit the growth rate of nitrite. I hope the suggestions can help you, and I wish you a good harvest of shrimp in the new year.

Indicators of Penaeus vannamei shrimp water body:

1. Nitrite: less than;

2. Ammonia nitrogen: less than;

3. Dissolved oxygen: the bottom water is greater than 3mg l;

4. pH value: to;

5. Hydrogen sulfide: less than.

6. Water transparency: 30cm-40cm in the early stage, 40cm-50cm in the middle stage, and 50cm-60cm in the later stage (cm is the meaning of centimeters and centimeters);

7. The adapted water temperature of Penaeus vannamei shrimp is 22 -34, and the optimal water temperature is 28 -32.

The high temperature limit for Penaeus vannamei shrimp is 41 degrees and the low temperature limit is 4 degrees.

The suitable water temperature for survival, feeding and growth is 18 degrees to 35 degrees. The optimum water temperature is 30-33 degrees. When the water temperature is below 18 degrees, the amount of food intake decreases.

The survival rate is reduced, and the water temperature is 9 degrees Celsius. When the water temperature is 18-30 degrees Celsius and the daily temperature varies within 6 degrees, all of them survive within 48 hours. and maintain normal feeding ability and strong vitality.

Between 18 degrees and 30 degrees Celsius, the total feeding intake, daily feeding rate and forage efficiency of Penaeus vannamei increased with the increase of water temperature. When the water temperature reaches 30 degrees, all three reach the maximum, and when the water temperature is greater than 30 degrees, the three decreases with the increase of water temperature.

The relative feeding rate at 33 degrees is a multiple of 24 degrees, the relative feeding rate at 30 degrees is a multiple of 24 degrees, and the relative feeding rate at 21 degrees is only 24 degrees. Daily food intake of 30-33 degrees Celsius is significantly higher than that of other water temperatures.

Solution: 1. Start the aerator or splash the whole pool with chemical aerators;

2. Microbial preparations such as bacillus, nitrifying bacteria, and photosynthetic bacteria can accelerate nitrite conversion;

3. Increase phosphorus fertilizer to lean water bodies, with calcium dihydrogen phosphate as the best to promote the absorption of nitrogen by phytoplankton, and sprinkle zeolite powder or alum and salt on the whole pool of partial fertilizer water;

4. Drain and change water in time, especially bottom water and sewage, and clean up the dirt in the pond in time;

5. The toxicity of nitrite in seawater is much less than that of freshwater, so the toxicity of nitrite can be reduced to a certain extent by appropriately increasing the salinity of the water body.

<> the pH value of freshwater aquaculture should be between, and the pH value of marine aquaculture should be between, and the amplitude of daily fluctuations should be less. At the same time, it is necessary to keep the oxygen content of the pond sufficient, the water quality should be transparent, and the impurities should not be too much.

<> The symptoms of ammonia nitrogen poisoning in Penaeus vannamei shrimp are generally as follows: the gill area of the small seedlings is blue-green, the shrimp body is yellow, the liver is albino or the light yellow lead is not embedded, the jejunum is not empty, and the stool is mopping. In the case of ammonia nitrogen poisoning, it is recommended to use organic acid products for detoxification.

Hello, this question about you summarizes the following points for you: shrimp metabolism produces ammonia gas in the water body, ammonia will be converted into nitrite under the action of oxygen and nitrosomonas reputation, and nitrite will be converted into nitrate under the action of oxygen and nitrifying bacillus. In general, this is a dynamically balanced microecology, and the ammonia nitrogen and salt in the water body will not exceed the tolerance threshold of the shrimp.

However, when the dissolved oxygen in the water body is insufficient to reduce the ability to degrade ammonia nitrogen, or the amount of feed is too large, the breeding density is too large, resulting in too much ammonia produced by shrimp metabolism, or the abuse of drugs to destroy the algal phase causes hypoxia in the water body, it will also cause the ammonia nitrogen in the water body to exceed the standard. The pond owner can take the following measures to reduce ammonia nitrogen: 1. Increase the oxygen of the pure greenhouse of Rongqing.

2. Increase salinity. 3. The use of microecological preparations to change the bottom can be sprinkled with nitrifying bacteria to decompose ammonia nitrogen nitrite. 4. Splash diatomaceous earth or zeolite powder, bentonite, etc. for adsorption.

5. Sprinkle and mix with yucca extract (Youlanbao). Yucca polysaccharides can combine ammonia pants and hydrogen sulfide, decompose subsalts, and reduce the content of ammonia nitrogen in water. It can be combined with ammonia in the intestine to form harmless ammonia, which is fully utilized and decomposed by intestinal bacteria, reducing the discharge of ammonia nitrogen and optimizing the water environment.

Workaround:

1. Start the aerator or sprinkle the whole pool with chemical aerators;

2. Microbial preparations such as bacillus, nitrifying bacteria, and photosynthetic bacteria can accelerate nitrite conversion;

3. Increase phosphorus fertilizer to lean water bodies, with calcium dihydrogen phosphate as the best to promote the absorption of nitrogen by phytoplankton, and sprinkle zeolite powder or alum and salt on the whole pool of partial fertilizer water;

4. Drain and change water in time, especially bottom water and sewage, and clean up the dirt in the pond in time;

5. The toxicity of nitrite in seawater is much less than that of freshwater, so the toxicity of nitrite can be reduced to a certain extent by appropriately increasing the salinity of the water body.

In general, too much nitrite is accompanied by an increase in ammonia nitrogen, which can be converted to nitrite and nitrite cannot be converted to ammonia nitrogen. Therefore, when using chemical or physical methods to degrade nitrite, it is necessary to act on nitrite and ammonia nitrogen at the same time.

Solution: a. Start the aerator or splash the whole pool with chemical aerators; b. Bacillus, nitrifying bacteria, photosynthetic bacteria and other microbial agents to accelerate nitrite conversion; c. Increase phosphorus fertilizer to lean water bodies, with calcium dihydrogen phosphate as the best, to promote the absorption of nitrogen by phytoplankton, and sprinkle the whole pool with zeolite powder or alum and salt on the partial fertilizer water bodies; d. Timely discharge and change water, especially bottom water and sewage, and clean up the dirt in the pond in time; e. The toxicity of nitrite in seawater is much less than that of freshwater, so the toxicity of nitrite can be reduced to a certain extent by appropriately increasing the salinity of the water body.

Prevention and treatment of nitrite.

1. Pump the bottom and change the water.

In the case of good exogenous water quality, it is tantamount to pumping the bottom to change the water, which is the best way to solve the high salt level. It should be noted that after changing the water, it should be sprinkled in time for detoxification, stress and immunity. On the one hand, it removes the toxins from the exogenous water and replenishes the missing carbon source of the algae in time, and at the same time prevents stress and enhances the disease resistance of the shrimp body.

2. Cultivating algae bacteria.

Nitrite levels in water are reduced by regularly spraying bacterial algae, such as photosynthetic bacteria, bacillus, VC, and acid preparations, but the conditions required are harsh.

3. Prevent in advance.

This is also the most hassle-free and effective method. Through the real-time monitoring of water quality, the timely cleaning of the bottom sludge, fundamentally reduce the production of nitrite, cut off the way of nitrite production, that is, the production of ammonia nitrogen, you can use Youlanbao, by improving the utilization of protein, reduce the production of ammonia nitrogen in animals, thereby reducing the discharge of ammonia nitrogen in the water body, reducing the content of ammonia nitrogen, nitrite will not be produced due to nitrification reaction, so as to prevent the problem of the increase of nitrite in the water.