4. Practical needs

Why pH, DO, Salinity, Temperature, ORP?

Effect of pH.

Actually, the pH of the water can range from 0 to 14. Shrimp and farmed fish have better health and production efficiency when the pH value of water varies from 7.5 to 8.5, when the values This is consistent with their blood pH. Excess pH values will reduce feeding, reduce growth, adversely affect FCR and inhibit the immune response of shrimp and fish.

Alkalinity is a measure of the ability to keep the pH stable and is measured in units of mg / l CaCO 3 . Alkalinity of shrimp pond should be in the range of 100 - 150 mg / l. High alkalinity, pH less fluctuate. Low alkalinity, the pH changes sharply, disadvantage for shrimp. Alkalinity is very easy to change, so check the alkalinity every 3-5 days.

Effect of salinity.

High salinity will change some environmental parameters such as pH, alkalinity. In addition, the algae in the shrimp growing rapidly, producing more toxic gas ... In particular, the source of oxygen in the water will increase sharply during the day, but reduced at night. At that time, the environment will be lacking in oxygen, leading to the shrimps emerging at midnight.

Salinity for shrimp and white shrimp is 5 - 35 (‰ - thousands). However, currently cultured white shrimp is recommended at 5% salinity to reduce the risk of hepatopancreas disease.

Effect of dissolved oxygen.

Dissolved oxygen is oxygen for aquatic animals. Shrimp aquaculture should ensure dissolved oxygen> 3.5 mg / l, but optimum> 5 mg / l.

Provides oxygen needed for aquatic animal life.

It is beneficial for the development of aerobic microorganisms, promote the resolution of organic matter.

Reduced toxic effects.

To inhibit the activity of harmful anaerobic organisms.

Strengthen immunity.

Effect of temperature.

Heat affects the growth and survival rate of shrimp. The best temperature for shrimp is 26 - 32 ° C. Pay attention when the temperature rises above 32 ° C. At 35 ° C, 100% of shrimp under one month of age die; At 40 ° C all shrimp will die. Low temperature will slow down the shrimp.

Effect of sulfur hydrogen.

Hydrogen sulphide is very toxic to shrimp, fish, animals, including humans. H 2 S formed by the anaerobic digestion of waste feed, herbicide and animal waste, or from sulfate ions by reducing Suynphat bacteria. The black-bottomed mud and the rotten egg odor are due to the presence of H 2 S. The alkaline earth ponds are at risk for high levels of Hydrogen Suynphua.

Prawns prefer to live near the mud, so the accumulation of H 2 S in the bottom mud and the bottom water layer greatly affect. Shrimp fatigue when H 2 S 0.1-0.2 mg / l; slowly die and sink to the bottom when the concentration of H 2 S in the bottom water is 0.9 mg / l, although high oxygen; and died instantly when H 2 S to 4 mg / l.

According to TCVN for shrimp culture water, the free sulfur H 2 S should not exceed 0.05 mg / l.

Effect of Ammonia.

Ammonium is toxic to shrimp. The actual test showed that NH 3 0.45 mg / L reduced the speed by 50%. According to ISO, free ammonia concentration NH 3 domestic shrimp is not exceeding 0.3 mg / l, but the optimal level of 0.1 mg / l.

Effects of nitrite.

Nitrit NO 2 - toxic to shrimp, fish. Nitrites penetrate the body of fish through the gills and skin. Nitrite works with blood, making the oxygen transport in the body difficult, becomes softer, slower, more susceptible to illness and even death. In particular, fish are very sensitive to nitrite. The nitrite limit for shrimp ponds is 1 mg / l NO 2 - (or 0.3 mg / l NO 2 - / N).

5. Specification.

-Direct monitoring of pH, DO, 24/24 salinity at shrimp pond.

-Can read, read pH, DO, Salinity at the scene through the display or can be monitored remotely by phone.

-Can synthesize data, pH parameters, DO, Salinity to form charts with up to 1 year.

-Can be controlled remotely by phone or automatically controlled according to the preset threshold.

-Set thresholds for each indicator and alerts via email or SMS.

6. Monitor interface on the phone.

-Phone monitoring interface, which can be monitored and controlled back to the field with optional options.

-Good interface on both iOS and Android platforms.

Find out more information: Click here