Protocol QT-03

Co-infection: haemorrhage and bacillary necrosis

Usually appears after a first course that did not clear. The document names the cause plainly: a dragged-out treatment and repeated antibiotic courses.

AgentTwo agents at once

SpeciesPangasius · snakehead

Withdrawal4 weeks before harvest

Step 0 · Identify

What you see at the pond

Open 10–20 fish and count the ratio before choosing a branch. This step cannot be skipped.

Both internal pus spots and external haemorrhage
Open 10–20 fish and count which dominates
Necrosis dominant → branch A. Haemorrhage dominant → branch B

Treatment

Day by day

Environment first, medicine after. The chart below includes the withdrawal period.

1
Stop feeding, change 30% of the waterDay 1
Stop feeding entirely.
2
Sample fish and assess the ratioDay 1
Open 10–20 fish and count whether internal pus spots or external haemorrhage dominates. This decides the branch.
3
Branch A — necrosis dominantDay 1–4
VIBRIO CLEAR then KMnO₄ + salt1 kg/3,000 m³ · 1 kg/1,500 m³ + 15 kg/1,000 m³
VIBRIO CLEAR is catalogued under the snail line. KMnO₄ and salt are common inputs.
4
Branch B — haemorrhage dominantDay 1–2
POWER GLUTA1 L / 5,000 m³, two consecutive days
5
Antibiotic — both branchesDay 1–10
FLOR-MAX + DOXYPA1 L each per 600–1,000 kg feed · once daily
The internal document uses cefotaxime + levofloxacin in branch A and Flor Max + levofloxacin in branch B. Levofloxacin is a fluoroquinolone — a banned class, replaced here.
6
Cut the pathogen loadDay 12
FYTOBLOOM PLUS1 L / 1,000 m³
Not yet in the web catalogue. Substitute AQUA DINE New.
7
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

Both branches use DOXYPA, so take 4 weeks from the last dose.

No improvement in 3–5 days

This is already the pond's second course. If it still does not clear, do NOT run a third — that is the road to the white liver, white gill condition in QT-04. Switch to liver recovery and environment work, and call Than Vuong technical staff to the pond.

Note

Remove all dead fish. Do not raise the feed rate during treatment.

Products used