01 · AquaGrow
What it is
Water treatment must be completed and checked before water reaches animals. Residual disinfectant means some active chemical remains. Similar signs can also come from low oxygen, a water shock or infection.
Signs to watch for
- Sudden distress follows a new water batch or chemical event.
- Several tanks sharing treated water are affected.
- Release checks are missing or show an unexpected residual.
Common causes
- Treatment or clearance was not verified before use.
- Dosing, labelling or mixing errors occur.
- Storage or cross-connected plumbing allows unsuitable water into tanks.
How to confirm the cause
- Identify the product, active ingredient, time, water batch and amount from records.
- Use the appropriate residual test with trained staff; also check DO and basic water readings.
What to do immediately
- 1
Stop the suspected water or chemical supply and keep the batch clearly identified.
- 2
Call the hatchery technician immediately. Maintain safe air support and keep workers away from hazardous chemical exposure.
- 3
Follow a technician-led plan using verified suitable water; do not transfer distressed animals into clean production units without a containment plan.
- 4
Do not mix neutralisers, acids, disinfectants or other products. Retain labels and ask the laboratory what samples are needed.
Prevention: your practical checklist
- Use written treatment and water-release checks with assigned responsibility.
- Separate chemical storage and clearly label tanks, lines and products.
- Maintain calibrated tests and record the person authorising water release.
When to call an expert
- Any sudden losses after suspected chemical exposure require immediate technical help.
- Worker exposure or breathing difficulty requires medical/emergency assistance, not only aquaculture advice.
Farmer questions
Can I judge chemical clearance by smell?
No. Do not sniff chemicals or rely on smell as a release test. Use the appropriate test and a verified water-treatment procedure.
Should I immediately add a neutraliser?
Do not guess the chemical or amount. Different products require different safety procedures. Obtain product-specific technical advice and test the water.
What information helps the technician?
Keep the product label, active ingredient, batch ID, timing, recorded amount, treated-water volume and residual results. Report which tanks received it.
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.
- SHAPHARI hatchery operating guidelines — production, biosecurity and records ↗MPEDA; linked guideline, not AquaGrow certification or a legal-compliance audit
- Hatchery operations and assessment framework (2007) ↗FAO FTP 446; historical P. monodon manual, not a vannamei treatment protocol