Bacillary necrosis, hemorrhage, rising FCR — losing the pond

Density

40–60 /m²

Target FCR

1,5–1,7

Harvest

6–8 months

🐟Biology & model

Grow-out pangasius: high density, FCR is key

Pangasius is raised in high-density earthen/floating ponds on pellets. Organic load and FCR decide profit — a bad environment weakens the liver, invites disease and spikes FCR.

CANFORTACALPHOS GRO

💧Pond environment

Bottom & toxic-gas management at high density

Excess feed and feces build up, raising NH3/NO2/H2S and lowering bottom oxygen. Water exchange + bottom probiotics + toxic-gas removal keep the pond stable and the liver healthy.

SOILMAX NewMAX 4000YUCCA C

🦠Common diseases

Bacillary necrosis & hemorrhage — treat the right agent

Bacillary necrosis (Edwardsiella ictaluri) and Aeromonas hemorrhage cause mass mortality. Identify the agent to use antibiotics effectively and avoid resistance.

FLOR-MAXOXYTETRAHERB GUARD

🛡️Liver & immunity

Healthy liver — strong immunity — lower disease risk

The liver is the most stressed organ in high-density pangasius. Protecting liver + gut + regular immune support helps fish cope, feed strongly and reduces antibiotic use.

HERB GUARDMAX LIVERPRO GUTAQUAMOS

1. 1Stocking

   Disease-free fingerlings, stocked when cool

   • Healthy, active, even-sized fish with a quarantine certificate. Fingerlings are usually about 40 fish/kg (≈ 25 g each); at least 10 cm per QCVN 02-20:2014.
   • Density: extension services advise 20–40 fish/m²; intensive ponds usually stock 40–60/m² (FAO).
   • Stock early morning or late afternoon; float the bags 10–15 minutes to match temperature and give a 2% salt bath for 5–10 minutes.
   • No feed on day 1; then one meal of about 0.5–0.8% of stock weight, increasing gradually.

   • YUCCA C2–2.5 kg/1,000 m³ (anti-shock)
   • Salt · fish bath2%, 5–10 minutes

2. 2Fish 20–200 g

   Build the gut, deworm early

   • Pellets at 30% protein for 5–20 g fish and 26% for 20–200 g; 2–4 meals a day, one afternoon meal on cold days.
   • Add probiotics and yeast regularly for a healthy, absorbing gut.
   • Deworm fish under 300 g: skip feed for a day, mix AQUA PRAZI into 80% of the ration for 3 days; repeat every 25–30 days; follow with vitamins and liver support.

   • AQUA PRAZI1 kg/15 t of fish · 3 days
   • PRO GUT2–3 g/kg feed every 2–3 days
   • AQUAMOS2–3 g/kg feed
   • CANFORTA1 kg/800–1,200 kg feed

   In the rainy season, below 28 °C water, bacillary necrosis peaks in fingerlings and juveniles (Can Tho University) — watch closely; see the protocols below.

3. 3Fish 200–500 g

   Protect the liver as the load climbs

   • Lower feed protein to about 22%.
   • Support the liver regularly; treat the bottom and toxic gases more often as feeding rises.
   • Fish over 300 g still need deworming about every 30 days — ask Than Vuong's technicians which product to use.

   • MAX LIVER3–5 g/kg feed
   • HERB GUARD5–7 ml/kg feed

4. 4Over 500 g → harvest

   Reach size, respect withdrawal

   • Feed about 18% protein once fish pass 500 g.
   • Harvest after about 7–8 months at 0.9–1.2 kg per fish (National Extension Centre).
   • Stop feeding at least 1 day before harvest; observe every label withdrawal period.
   • After harvest: remove sludge and dry the bottom for the next crop.

   • CANFORTA1 kg/1,500–1,800 kg feed

Dashed chips: common farm inputs, not Than Vuong products. Sources: QCVN 02-20:2014/BNNPTNT · Research Institute for Aquaculture No. 2 · National Agricultural Extension Centre · Dan toc & Phat trien newspaper · FAO — Striped catfish fact sheet · Can Tho University — common pangasius diseases · Than Vuong technical team — staged deworming · Doses from Than Vuong product labels