Black water is not a disease in a shrimp pond, it is a management tool, and humic acid is how Thai and Indonesian farms get there deliberately instead of by accident. The purpose is twofold: shade the water column so green algae and blue-green blooms cannot take over, and put organic carbon on the pond bottom so the heterotrophic bacteria that consume ammonia and nitrite have something to work with. When the bottom is sour and the water is bright green, that is the week when farms start seeing white feces and slow growth.
This aquaculture grade is 60% humic acid, 95% soluble, with chloride held below 0.5% and a heavy metal panel that meets feed-grade expectations, because whatever goes into the pond goes into the shrimp. The standard protocol we give new farms is 20-30 kg per hectare per metre of depth every 10 to 14 days, applied in the late afternoon when the algae is not actively photosynthesising. On a 1.5m pond that works out at 30-45 kg per hectare per application, and the water turns to a stable brown-black within 24 to 48 hours.
We always say the same thing in the first meeting: this is not a substitute for aeration, and it is not a treatment for an active vibrio outbreak. It is a preventive tool that keeps the bottom redox potential and the algae community where you want them, and farms that run it on a schedule spend less on water treatment chemicals across a cycle than farms that only react when the water turns.
Key Features
- Shades out green and blue-green algae: Stable brown-black water colour limits light penetration so undesirable blooms cannot dominate the pond
- Feeds the heterotrophic bacteria: Organic carbon load on the bottom supports the bacterial population that removes ammonia and nitrite
- Chloride below 0.5%: Safe for low-salinity and mixed freshwater shrimp ponds where chloride load matters
- Aquaculture heavy metal panel: Cd, Pb and As limits documented per batch, because pond inputs end up in the harvested animal
- 95% soluble powder: Dissolves in a drum or spray boat without leaving the residue that blocks the paddle wheel intake
- Scheduling fit: 10-14 day application rhythm matches normal liming, probiotic and mineral programmes
Technical Specifications
| Parameter | Specification |
|---|
| Appearance | Black fine powder |
| Humic Acid (dry basis) | 60% min |
| Water Solubility | 95% min |
| Moisture | 12% max |
| pH (1% solution) | 8.5-10.5 |
| Chloride | 0.5% max |
| Heavy Metals | Cd below 3 ppm, Pb below 10 ppm, As below 5 ppm |
| Dosage | 20-30 kg/ha per meter of pond depth, every 10-14 days |
Applications
Apply 20-30 kg per hectare per metre of depth every 10-14 days, in the late afternoon. Pre-dissolve in a drum at 1:20 and spray across the pond, or broadcast dry from the boat on the upwind side. For pond preparation between cycles, use 100-150 kg per hectare on the dried bottom before filling, then irrigate.
Do not apply on the same day as a potassium permanganate or chlorine treatment; wait at least 48 hours. Do not exceed the dose in ponds with heavy organic sludge and low dissolved oxygen, because the extra carbon load will pull oxygen down overnight. Check DO at 3am for the first three days after the first application on any new pond.
Packaging, Documentation & Quality Assurance
Packed in 25kg PP woven bags with PE liner, 40 bags per pallet, and in 1 ton jumbo bags for feed mills and integrators. Neutral printing or private label is available with your dosing table printed on the bag, in Thai, Bahasa or English.
Each lot is tested for humic acid, solubility, chloride, moisture and pH, with a heavy metal panel on a quarterly composite. We keep a sealed retained sample for 24 months. For integrators running supplier audits, we can provide the full document pack: COA, heavy metal report, non-GMO statement, and third-party inspection at Qingdao on request.
Your message must be between 20-3,000 characters!
