Protocol QT-02
Haemorrhagic septicaemia
Unlike bacillary necrosis, this one shows from the outside: redness at the fin bases, around the vent and on the flank.
Step 0 · Identify
What you see at the pond
No necropsy needed. Lift a few fish and look at the fin bases and vent.
- Red fin bases and vent
- Skin haemorrhage, scale loss, ulcers
- In 25-day pangasius fry, a red vent is the earliest sign
Treatment
Day by day
Environment first, medicine after. The chart below includes the withdrawal period.
- 1Heavy water change, siphon the bottomDay 1–2
With scale loss and ulcers, change water on two consecutive days.
- 2Stabilise the waterDay 1–2Lime + salt7 kg/1,000 m³ + 15 kg/1,000 m³
Common farm input, not a Than Vuong product.
- 3Disinfect the waterDay 1VIBRIO CLEAR1 kg / 3,000 m³
- 4AntibioticDay 1–5OXYTETRA2–3 g/kg feed per meal · twice daily for 5 days (label: Aeromonas, Pseudomonas haemorrhage in fish)
- 5Disinfect after treatmentDay 12TCCA or AQUA DINE New1 kg/2,000–2,500 m³
TCCA is a common farm input.
- 6Recovery, raise feed graduallyDay 11–14CANFORTA · HERB GUARD · QUICKSHELL GOLD1 L/800 kg + 1 L/1,000 kg + 1 L/1,000 kg feed
Withdrawal
4 weeks
OXYTETRA needs 4 weeks before harvest (per label), from the last dose.
No improvement in 3–5 days
Check for internal pus spots — co-infection with bacillary necrosis is common; switch to QT-03. Do not extend beyond the label course and start another one.
Note
Cage culture: bathe fish in WORK COP Plus 1 L/3,000 m³ for 10–15 minutes, remove sick fish, then start medicated feed.
Products used
What to keep on hand
Doses are given in each step above. Open a product for its full label and registration number.
QUICKSHELL GOLDProvides minerals, supplements iron for rapid blood formation, and promotes thick, lustrous, healthy skin and scales.
WORK COP PlusDisinfectant against bacteria, fungi and protozoan parasites; helps prevent fungal slime
AQUA DINE NewBroad-spectrum disinfectant, effective against viruses, bacteria, fungi, and protozoa; aids in wound healing.
CANFORTAHigh-absorption vitamins and amino acids — helps fish grow and recover quickly
OXYTETRAFor hemorrhagic enteritis caused by Aeromonas/Pseudomonas in pangasius; for luminous disease caused by Vibrio in shrimp larvaeEasily confused with
Related protocols
If the signs do not match cleanly, check these before starting any medicine.