Several diseases and water-quality problems can look alike. Sudden deaths, falling feed intake or breathing distress need prompt advice from a qualified aquatic animal health professional and an appropriate diagnostic laboratory.
What it is
The bacterium damages cells of the digestive gland. This is a specific bacterial disease, not another name for every case of hepatopancreas damage or AHPND.
Warm, saline conditions have been associated with outbreaks, but temperature or salinity cannot diagnose NHP. This guide does not establish present-day Indian disease status.
Signs to watch for
- Weakness, reduced feeding and poor growth or a thin appearance.
- A smaller, pale or abnormal digestive gland in affected shrimp.
- Soft shells, fouling or darkened gills may occur but are nonspecific.
What else can look similar?
- AHPND, EHP and other digestive-gland disorders.
- Poor nutrition, oxygen problems and unsuitable water chemistry.
Spread & risk factors
- Infected stock and exposure to infected material are biosecurity concerns.
- Moving animals, sludge or contaminated gear between ponds can compromise containment.
How to confirm the cause
- Ask for specific H. penaei PCR testing with histological assessment where indicated.
- Give the professional your water, feed and mortality history; a general Vibrio culture is not an NHP test.
Prevention: your practical checklist
Use traceable seed from a documented health programme and retain source records.
Control animal introductions and protect ponds from contaminated material.
Monitor water trends and avoid preventable stress, while maintaining a species-appropriate environment.
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.
What to do if you suspect a problem
Contact a qualified professional; assess oxygen, feeding and the wider pond condition.
Arrange laboratory examination rather than selecting an antibiotic by organ colour.
Follow the appropriate official pathway for any suspected unusual infection.
Keep affected stock, equipment and water separate. Agree on safe disposal and any harvest or discharge with your professional.
What not to do
- Do not call every pale hepatopancreas NHP or AHPND.
- Do not change salinity abruptly to try to treat a suspected bacterial infection.
- Do not mix medicines or pond chemicals on guesswork; use only legally permitted inputs under qualified advice.
Farmer questions
Is NHP the same as AHPND?
No. They involve different agents and diagnostic approaches, although outward signs can overlap.
Can a routine pond-bacteria plate confirm NHP?
No. H. penaei is an intracellular agent. Ask a qualified laboratory for the appropriate specific tests and interpretation.
Sources & further reading
Sources support the discussion above. Their inclusion does not mean these organisations reviewed or approved this article. Some references cover other shrimp species; the guide states limitations where relevant.
- 01Infection with Hepatobacter penaei (necrotising hepatopancreatitis) ↗
World Organisation for Animal Health — Aquatic Manual (2019; historical chapter)
- 02Necrotising hepatopancreatitis — field signs; historical guide ↗
NACA / Australian Government — historical Asia–Pacific identification field guide; not current surveillance
AI-assisted source check: 16 October 2026, not professional approval. Reference dates refer to the documents, not their URL filenames or live disease status.
AquaGrow completed an AI-assisted technical-source and translation-consistency check on 16 October 2026. This is educational content, not an individual pond diagnosis, a prescription or an endorsement by ICAR-CIBA, NACA or WOAH. An independent clinical review has not been completed. Translations also await independent review by native-speaking aquaculture specialists.
This is a selected learning library, not a complete disease list or a statement that every condition occurs in Andhra Pradesh or Odisha. No live outbreak surveillance is provided.