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.

AgentAeromonas and opportunistic bacteria

SpeciesPangasius · snakehead · tilapia · climbing perch · catfish

Withdrawal4 weeks before harvest

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.

1
Heavy water change, siphon the bottomDay 1–2
With scale loss and ulcers, change water on two consecutive days.
2
Stabilise the waterDay 1–2
Lime + salt7 kg/1,000 m³ + 15 kg/1,000 m³
Common farm input, not a Than Vuong product.
3
Disinfect the waterDay 1
VIBRIO CLEAR1 kg / 3,000 m³
Than Vuong product, currently catalogued under the snail line.
4
AntibioticDay 1–10
FLOR-MAX + DOXYPA1 L each per 600–1,000 kg feed · once daily
The internal document uses enrofloxacin for snakehead and tilapia — a banned substance in aquaculture, replaced here.
5
Disinfect after treatmentDay 12
TCCA or AQUA DINE New1 kg/2,000–2,500 m³
TCCA is a common farm input.
6
Recovery, raise feed graduallyDay 11–14
CANFORTA · HERB GUARD · QUICKSHELL GOLD1 L/800 kg + 1 L/1,000 kg + 1 L/1,000 kg feed

Withdrawal

4 weeks

FLOR-MAX 12 days, DOXYPA 4 weeks — take the longer, 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 10 days and start another course.

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