01 · AquaGrow
What it is
Low reproductive output is a production warning, not a diagnosis. Broodstock condition, husbandry, feed and water need review together. Compare comparable animals and cycles rather than a promised universal egg count.
Signs to watch for
- Fewer successful spawning events.
- Egg output changes across comparable cycles.
- Broodstock condition or feeding also deteriorates.
Common causes
- Broodstock condition or reproductive readiness differs.
- Feed quality, handling or environmental management is unsuitable.
- Health problems or inaccurate counts obscure the real trend.
How to confirm the cause
- Review broodstock identity, condition, feed lots, water readings and spawning records.
- Ask a reproduction specialist to review the animals and counting method; arrange health testing when indicated.
What to do immediately
- 1
Verify the records and compare like-for-like cycles.
- 2
Check water, feed handling and broodstock condition without unnecessary disturbance.
- 3
Arrange a specialist review before changing diet, reproductive procedures or stock selection.
Prevention: your practical checklist
- Keep individual or consignment-level maturation and spawning records.
- Use a documented, species-appropriate nutrition and husbandry plan.
- Investigate gradual declines before repeating the same changes across all animals.
When to call an expert
- Seek early review for repeated poor output or a major change from the unit’s trend.
- Deaths, severe weakness or abnormal water conditions need urgent help rather than routine production troubleshooting.
Farmer questions
Is there one normal egg number for every female?
No. Compare suitable records for the species, animal condition and system. Do not use a single marketing number as a health or quality guarantee.
Should I change all broodstock feed immediately?
First review feed identity, handling, consumption and the wider production history with a specialist. Sudden unplanned changes can make the cause harder to establish.
Does poor spawning prove infection?
No. It has several possible explanations. A health professional should decide whether examination or laboratory testing is needed.
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