01 · AquaGrow
What it is
pH describes how acidic or alkaline water is. A rapid change can stress shrimp even if a later reading looks acceptable. Check the meter and the trend before trying to correct it.
Signs to watch for
- A sudden difference from the pond’s usual pH pattern.
- Reduced feeding, weak activity or unusual swimming after a water change.
- Stress appears after rain, a bloom change or chemical application.
Common causes
- Bloom activity changes the daily pH pattern.
- Low buffering capacity makes pH less stable; alkalinity measures this buffering.
- Rain, source water or an unsuitable input changes water chemistry.
How to confirm the cause
- Calibrate the pH meter and repeat measurements at representative points; record the time.
- Measure alkalinity, DO, salinity and temperature, and compare with previous readings and recent inputs.
What to do immediately
- 1
Repeat the pH test with a checked meter, but do not delay help if shrimp are distressed.
- 2
Maintain aeration and pause feed if shrimp are distressed. Stop unplanned inputs.
- 3
Call a technician with the readings, recent input names and water-change history. Do not add acid or quicklime to chase a target number.
- 4
Make only a gradual, test-based correction planned by a technician; retest after each planned change.
Prevention: your practical checklist
- Log morning and afternoon pH and test alkalinity regularly.
- Test reservoir water before use; avoid abrupt large changes.
- Choose any buffer or mineral plan from tests, not a fixed per-acre recipe.
When to call an expert
- Call urgently for a sharp pH change with abnormal swimming, poor breathing or deaths.
- Get advice for repeated large daily swings or readings outside the planned grow-out range.
Farmer questions
What is a common grow-out pH reference?
ICAR-CIBA guidance gives pH 7.5–8.5 and advises limiting daily variation. Stability matters as well as the number. Hatchery stages and individual pond chemistry need their own plan.
Is more lime always the answer?
No. Material choice and need depend on tests and the cause of the change. Do not add quicklime or several chemicals as an emergency guess.
What should I tell the technician?
Send timed pH readings, alkalinity, DO, salinity, temperature, recent rain or water exchanges, and the names and amounts of recent inputs.
Sources & further reading
AI-assisted educational content and translations, source-checked 17 October 2026. Not an individual diagnosis or prescription. Independent aquaculture-health and native-language specialist approvals have not been supplied. Sources do not endorse AquaGrow.