01 · AquaGrow
What it is
Biofilm is a layer of microorganisms attached to a surface. Dirty tanks, pipes and accumulated waste can undermine hatchery hygiene. Recurring deaths still need a full investigation rather than an automatic biofilm diagnosis.
Signs to watch for
- Visible deposits, slime or stagnant sections.
- A recurring pattern in tanks sharing the same system.
- Cleaning and maintenance checks are missing or inconsistent.
Common causes
- Waste removal or between-batch cleaning is incomplete.
- Pipe layout or maintenance leaves difficult-to-clean areas.
- A different shared feed, water or health problem is overlooked.
How to confirm the cause
- Review the batch timeline and inspect accessible equipment with trained staff.
- Ask the technician or laboratory for appropriate surface, water and animal assessment; do not infer a pathogen from slime alone.
What to do immediately
- 1
Check animals, DO and water first; arrange urgent help if losses are rising.
- 2
Map the recurring pattern and keep suspect equipment separate.
- 3
Plan safe maintenance and waste removal with the technician. Do not scrub occupied larval tanks or disturb deposits indiscriminately.
- 4
Verify cleaning and water clearance before a controlled restart; do not use a chemical cocktail.
Prevention: your practical checklist
- Maintain an auditable between-batch cleaning and inspection plan.
- Design and service lines to avoid stagnant or inaccessible areas.
- Link maintenance and water-release checks to each production cycle.
When to call an expert
- Seek urgent assessment for recurrent deaths or multiple affected tanks.
- Get technical help if a system cannot be properly inspected, cleaned or verified before reuse.
Farmer questions
Does slime prove a disease-causing biofilm?
No. It signals a hygiene issue to investigate. Determining why larvae are ill requires water, animal and system assessment.
Should I clean everything while larvae remain inside?
Do not carry out unplanned scrubbing or chemical cleaning in occupied larval tanks. Obtain an animal-safe operational plan.
Does a stronger disinfectant solve recurrence?
Not necessarily. Cleaning access, waste, process verification and other contamination routes all matter. Do not substitute stronger mixtures for an investigation.
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
- Luminescent bacteria in shrimp hatcheries — better management advisory ↗ICAR-CIBA Technical Advisory 1; historical 2009/2010 publication, not current outbreak surveillance
- Hatchery operations and assessment framework (2007) ↗FAO FTP 446; historical P. monodon manual, not a vannamei treatment protocol