THE SECRET TO STABILIZING SHRIMP POND pH THROUGHOUT THE CULTURE CYCLE: A COMPREHENSIVE SOLUTION FOR SUSTAINABLE ENVIRONMENTS
In intensive shrimp farming, pH is not just a number—it is an “indicator of life” for the entire pond ecosystem.
Maintaining stable pond pH plays a decisive role in the effectiveness of medications and chemicals, and especially in the toxicity of gases such as NH₃ and H₂S.
Even small fluctuations in pH can cause shrimp stress, feeding reduction, or even mass mortality.
1. Importance of optimal pond pH and the mechanism of fluctuation
Understanding the nature of pH helps farmers proactively manage the environment instead of reacting only when problems occur.
What is the ideal shrimp pond pH?
Generally, the optimal shrimp pond pH ranges from 7.5 to 8.5.
However, stability is more important than absolute value.
The daily fluctuation between 6 AM and 2 PM should be kept below 0.5 units.
If pH < 7.5: Shrimp may have soft shells, slow molting, reduced metabolism, and increased toxicity of H₂S.
If pH > 9.0: Shrimp experience gill irritation, breathing difficulty, and NH₃ becomes highly toxic, potentially causing sudden death.
Why does pond pH fluctuate?
This fluctuation mainly results from the photosynthesis and respiration cycle of algae and microorganisms:
Morning (low pH): At night, algae and shrimp respire, releasing CO₂. CO₂ forms carbonic acid (H₂CO₃), causing pH to drop to its lowest level at dawn.
Afternoon (high pH): During the day, algae photosynthesize and absorb CO₂, reducing acidity and raising pH, which peaks around 2–4 PM.
2. How to manage pH fluctuations scientifically
Solutions depend on whether pH is too low or too high to avoid shocking the shrimp.
Raising low pH (common after rain or acidic ponds)
When pH drops below 7.5, shrimp often become lethargic and have weak shells.
Solutions:
Use lime to stabilize pH: Apply agricultural lime (CaCO₃) or dolomite lime.
If pH drops sharply after heavy rain, hydrated lime (Ca(OH)₂) can be used at 10–15 kg/1,000 m³ for rapid correction.Increase alkalinity: Alkalinity acts as a buffer for pH stability. Maintain >120 mg/L to reduce fluctuations.
Treat acidity (acid sulfate soils): Use specialized acid-removal products to bind heavy metal ions.
Lowering high pH (caused by algae bloom)
When algae become too dense (dark green or tea-colored water), afternoon pH may exceed 9.0.
Solutions:
Safe algae control: Apply probiotics at night to compete for nutrients and suppress algae growth. Avoid strong chemical algicides that may cause oxygen depletion.
Add organic carbon: Use molasses (5–10 kg/1,000 m³) or fermented molasses. Bacteria consume it and release CO₂, gradually lowering pH.
Partial water exchange: Replace 20–30% of water at night to reduce algae density and stabilize pH.
3. Using lime and probiotics to maintain stable pH throughout the cycle
Preventive management reduces costs and increases farming success rates.
Role of lime in pH management
Lime not only adjusts pH but also stabilizes water buffering capacity.
Apply agricultural lime 1–2 times per week (10 kg/1,000 m³) for maintenance.
After rainfall, spread lime along pond edges to prevent acidic runoff from lowering pH.
Use of supporting products (Yucca-Zeolite and probiotics)
Products like Yucca-Zeolite help:
Absorb toxic gases such as NH₃ and H₂S, which increase when pH is unstable.
Clean pond bottoms and support beneficial microbial growth, helping maintain balanced algae levels (light green or tea-green water).
This is ideal for stable pond pH conditions.
Farmers can learn more and explore related products here. See more: …