Turbid water, high NO2 — how to handle it?

Turbid pond water with high NO2/NH3 indicates microbial imbalance. Requires quick treatment to prevent shock and mortality.

White feces, EHP — how to handle it?

White feces (floating feces, loose or broken gut contents) can come from gut microbial imbalance, harmful bacteria, gregarines, toxic algae or environmental stress; ponds with EHP also often show white feces. Do not conclude EHP from white feces alone — examine samples and run PCR. Than Vuong's protocol: feed CLEVER + FLASH to support gut microbial balance while checking and stabilising the pond.

Weak appetite, slow growth — how to handle it?

Weak appetite and slow growth usually caused by nutritional deficiency, environmental stress or gut issues. Need vitamins + minerals + digestive enzymes.

Vibrio, disease outbreak — how to handle it?

Vibrio parahaemolyticus causes early mortality syndrome (EMS/AHPND), black spots, liver necrosis. Need disinfection + bacterial control + immune boost.

Swollen liver, weak pancreas — how to handle it?

A swollen or shrunken, pale hepatopancreas with fewer lipid droplets is weakened — often by toxins (toxic algae, gases, poor feed), after a course of drugs, bacteria or parasites. Find the cause, lighten its load and feed hepatopancreas-support products at label doses.

Fish diseases — how to handle it?

Fish with ulcers, hemorrhaging, gill rot, fungal infections, parasites. Need water disinfection + treatment + nutritional recovery.

Snail farming — how to handle it?

Babylonia snails need clean water, sufficient minerals for shell formation, stable probiotics. Specialized products for mollusks.

Veterinary medicine — how to handle it?

Veterinary medicines for bacterial infections, parasites in shrimp, fish and livestock. Note withdrawal periods before harvest.

What NH3 level is dangerous for shrimp?

NH3 above 0.1 mg/L causes stress, above 0.3 mg/L can be lethal. Apply YUCCA immediately when NH3 exceeds 0.1 mg/L and treat the root with SOILMAX New + MAX 4000 probiotics.

How long does it take to reduce high NO2?

With MAX 4000 specialized NO2 probiotics, usually 2-3 days for noticeable reduction. Use starting dose 200g/1,000m³ for 3 consecutive days, then maintain every 3-5 days.

Can white feces spread from one pond to another?

Yes. EHP and Vibrio causing white feces spread through water, equipment, and infected postlarvae. Disinfect equipment between ponds, PCR-test postlarvae before stocking.

EHP (Enterocytozoon hepatopenaei) is a microsporidian with no complete cure yet. The approach is early prevention, keeping the gut and hepatopancreas healthy (FLASH + CLEVER per Than Vuong's protocol) and building resistance so shrimp keep eating and growing.

How to identify hepatopancreas problems in shrimp?

Check by gently pressing the liver: healthy liver is dark brown, firm, doesn't break. Weak liver is pale (yellow/white), swollen, breaks easily under light pressure, lipid loss (no oil when pressed). Check weekly.

Shrimp liver is pale but still eating, should I treat?

Treat immediately. Pale liver is an early sign — if delayed, shrimp will stop eating and die en masse. Add HERB GUARD + LIVER GRO immediately, reduce feed 30% to relieve liver workload.

What is TPD and how does it differ from EMS/AHPND?

TPD (Translucent Postlarvae Disease) is caused by toxin-gene-carrying Vibrio parahaemolyticus VP4-24 attacking PL5-PL15 postlarvae: translucent body, shrunken hepatopancreas, empty gut, bottom-sitting, 80-100% mortality within days. Unlike EMS/AHPND, TPD causes no obvious soft shell — it destroys digestive mucosa cells directly, so early prevention and a healthy gut and hepatopancreas are key.

What are the earliest signs of TPD in PL?

Under magnification/light: PL turn abnormally translucent, the hepatopancreas shrinks and pales, the gut is empty of feed, weak PL sit at the tank bottom. Once 5-10% of PL show these signs, mortality typically explodes to 80-100% within 2-3 days — call a technician and act immediately.

NEW · POULTRY RANGE

Poultry health & nutrition

19 liquid and powder formulas for drinking water and feed — now introducing.

Explore the range Contact us

Solutions by species

What are you farming?

Pick your species — see environment, disease prevention & treatment, nutrition protocols and dedicated products.

Core focusShrimp farmingWhiteleg & black tiger shrimp — earthen and lined ponds. Full protocol from pond prep to harvest.View solutions

Marine fishGolden pompano, cobia, grouper — sea cages and marine ponds.View solutions

Fish farmingPangasius, tilapia, red tilapia, snakehead — ponds, rafts and cages.View solutions

Than Vuong technician checking a shrimp feed tray with the farmer

👨‍🔬 Field technical team

Ask a Than Vuong technician

Our technicians visit ponds and advise by phone and Zalo — technicians and farmers decide what the pond needs.

📞 Call +84 867 957 568 💬 Zalo chat

Urgent after hours? Ask the AI assistant (reference only) →

Feed calculator, mineral calculator and Nuôi Lời app screens on a phone

🛠️ Free tools

Pond tools

Quick pond-side calculations on your phone — no sign-up.

See all tools →

Than Vuong technical datasheets, product specifications and usage guides

246+ documents

Technical Information

Technical documents, usage guides and detailed product specifications.

View details →

NEW LAUNCHPond water coloring · ShrimpFYTO FLOC — Natural tea-color pond conditionerNatural tea colorStable environmentNatural shrimp feedView product →

Trusted product line-up

Today’s picks · 4 Nov 2026All products →

Veterinary drug

TETRA MAX

20% oxytetracycline powder for feed — use only once a bacterial infection is confirmed, per the label or a vet's advice. Stop 4 weeks before harvest.

Shrimp (in feed): 3 – 5 g/kg
Course: 5 – 7 days

Gut health

PRO F

Probiotics with yeast — stronger feeding, a healthy gut and lower FCR.

Routine: 3 – 5 g/kg
Gut recovery: 10 g/kg

Water probiotic

NIAZYME

Bacillus subtilis for pond water — builds and holds a stable water color all season.

Months 1–2: 3,000 m³/pack
Months 3–4: 2,000 m³/pack

Hepatopancreas

HERB GUARD

Strengthens hepatopancreas function, improves liver color and supports toxin removal.

Liver upkeep: 5 – 7 g/kg
Toxin removal: 7 – 10 g/kg

Distribution Network

Partnerships & Distribution

Find a nearby Than Vuong distributor or become a distribution partner and grow an exclusive brand.

Find a distributor or partner →

Domestic and international co-production partnership illustration

🌍 Partnerships

Domestic & International Co-Production

Bring your technology into Vietnam, or contract-manufacture at our GMP-WHO factory.