01 · AquaGrow
What it is
Vibriosis is a group of illnesses involving pathogenic Vibrio bacteria. Many vibrios occur naturally in water. Finding them on a plate is not, by itself, proof that they caused the shrimp’s illness.
Signs to watch for
- Reduced feeding, weakness, shrimp near the edges and continuing or increasing deaths.
- Red body or appendages, shell lesions or damaged tissues in some cases.
- Luminescence in some infections; absence of glowing does not exclude bacterial disease.
Common causes
- Different Vibrio species and strains can damage shrimp. Some luminous strains cause glowing animals, especially in hatcheries; most vibriosis cannot be recognised by a glow. AHPND is a distinct toxin-associated disease, not a name for every Vibrio problem.
- Similar signs can have other causes: Oxygen shortage, toxic-water events and handling stress. WSSV, TSV and other conditions with red colour, weakness or mortality.
How to confirm the cause
- A qualified laboratory may combine tissue examination, bacterial culture, identification and additional pathogen tests.
- If treatment is being considered, ask the professional about susceptibility evidence, legal permissions and residue safeguards. A water-plate count alone cannot choose a medicine.
What to do immediately
- 1
Measure oxygen and review aeration, feeding and recent input changes promptly.
- 2
Arrange examination and laboratory samples before starting unplanned medication.
- 3
Record mortality, lesions and water readings; correct identified management problems with professional guidance.
- 4
Keep affected stock, equipment and water separate. Agree on safe disposal and any harvest or discharge with your professional.
Prevention: your practical checklist
- Match feed to current consumption and manage organic waste without disturbing decomposing sludge.
- Keep oxygen and circulation adequate; check trends rather than adding products to mask poor water.
- Use good-quality stored feed, traceable seed and a controlled inlet-water plan.
- Assign nets, trays and boots to each pond; clean and disinfect equipment under the farm’s biosecurity plan.
- Keep seed-batch, feeding, water-quality and mortality records so a change is noticed early.
When to call an expert
- Call an aquatic animal health professional urgently if deaths rise, shrimp gather at the surface, or breathing becomes difficult. Check dissolved oxygen while arranging help.
- Arrange an assessment if these signs persist, feeding falls or growth stays behind the crop trend. Send water readings, recent input records and photographs; ask the laboratory how to collect samples.
Farmer questions
Does every Vibrio-positive test mean disease?
No. Many vibrios are part of aquatic environments. Species or strain, tissue damage, shrimp condition and other findings matter.
Can I use my neighbour’s antibiotic?
No. The cause, bacterial susceptibility and permitted products may differ. Unnecessary use risks residues, resistance and a missed diagnosis.
What should I record before asking for help?
Note the pond ID, culture day, recent deaths, feed intake, water test readings and recent changes. Ask the laboratory about suitable samples before adding a treatment. A photograph alone cannot confirm the cause.
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.
- Cultured Aquatic Species Information: Penaeus vannamei — diseases and management ↗Food and Agriculture Organization of the United Nations (FAO); historical species profile
- Better Management Practices for shrimp farms ↗Marine Products Export Development Authority (MPEDA)
- Health management in Asian aquaculture — opportunistic infections and environment ↗FAO