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Sodium Humate for Aquaculture is a high-molecular-weight organic sodium salt produced through the chemical extraction of natural weathered coal or lignite. Classified as a commonly used environmental conditioner in aquaculture, its core functions address three key scenarios: shading and algae control, pond bottom remediation and detoxification, and water stabilization and anti-stress support. It is suitable for use with a wide range of freshwater and marine aquaculture species, including shrimp, crabs, fish, and shellfish.
I. Core Fundamental Attributes
1. Core Components and Parameters
Main Components: Sodium Humate (Primary Active Ingredient), Organic Chelates, Trace Mineral Elements (Calcium, Magnesium, Iron, etc.)
Key Parameters (Industry Standard):
| Index Item | Premium Product Standard | Common Specifications |
|---|---|---|
| Humic Acid (Dry Basis) | ≥55%~70% | Powder / Granule / Flake |
| Water Solubility | ≥85%~98% | 25kg/bag or 10kg/bag |
| Moisture Content | ≤12%~15% | — |
| pH Value | 8~10 (Weak Alkaline) | — |
Implementation Standards: Reference GB/T 11957-2001; products specifically for aquaculture use must display the Ministry of Agriculture Registration Certificate Number and comply with the NY/T 2808-2015 standard.
2. Appearance and Characteristics
Appearance: Black powder, spherical granules, or flakes; non-toxic and odorless; highly soluble in water, forming a dark brown colloidal suspension upon dissolution.
Core Characteristics: Contains active functional groups such as carboxyl and hydroxyl groups, possessing ion exchange, adsorption, complexation, and flocculation capabilities.
II. Core Functions and Application Scenarios
1. Core Functions (Four Major Effects)
Light Shielding & Algae Control: Upon dissolving in water, it forms a “black veil” layer that absorbs the blue-violet light required for algal photosynthesis, thereby inhibiting the proliferation of harmful algae (such as moss and blue-green algae) and creating growth space for beneficial algae.
Sediment Remediation & Detoxification: Adsorbs and complexes heavy metals (zinc, copper, lead, mercury) and organic pesticide residues; degrades ammonia nitrogen, nitrites, and hydrogen sulfide generated by residual feed and waste in the bottom sediment; and alleviates issues of blackening and foul odors in the pond bottom.
Water Stabilization & Stress Mitigation: Balances the water body’s pH level and stabilizes the algal and bacterial flora; mitigates stress responses caused by sudden weather changes, high temperatures, water exchanges, and typhoons; and reduces instances of fish and shrimp “gasping at the surface” or “hugging the banks.”
Water Purification & Algae Cultivation: Flocculates suspended solids in the water body, improving clarity and resolving muddy water conditions; provides a carbon source to support the growth of beneficial algae, thereby preventing algal collapse and sudden water quality shifts.
2. Typical Application Scenarios
Water Quality Issues: Turbid water, surface oil films, excessive foaming, black and foul-smelling bottom sediment, elevated ammonia nitrogen/nitrite levels, or heavy metal contamination exceeding limits.
Stressful Conditions: Sudden weather changes, hot and sultry weather, pre- and post-water exchange periods, pre- and post-typhoon/heavy rainfall periods, or high-density farming during the late stages of the culture cycle.
Specialized Needs: Proliferation of moss/filamentous algae, recovery following algal collapse, bottom sediment improvement in aging ponds, or water stabilization during fish/shrimp molting and nursery stages.
III. Usage, Dosage, and Application Guidelines
1. Basic Dosage (Calculated based on a water depth of 1 meter; dosage should be appropriately increased for reservoirs/large bodies of water).
| Scenario | Dosage (per mu·meter) | Application Method |
|---|---|---|
| Daily water regulation & stabilization | 200~300g | Dissolve in water and spray evenly over the whole pond |
| Deteriorated water / sediment quality | 500~1000g (1~2kg) | Whole pond spraying or dry broadcasting (granule type) |
| Outbreak of moss / harmful algae | 1~1.5kg | Targeted partial spraying + reapply at 24-hour interval |
2. Usage Guidelines
Dissolution Method:For freshwater environments, add directly to the water to dissolve. For saltwater environments, dissolve in freshwater first, then dilute and broadcast across the pond (this enhances solubility).
Timing of Application:Avoid use during rainy, sultry, or low-dissolved-oxygen conditions (e.g., when fish are gasping at the surface). Refrain from using insecticides or disinfectants for three days before and after application.
Recommended Combinations:For optimal results, use in conjunction with photosynthetic bacteria, EM bacteria, or oxygen-enhancing agents.
Product Form Selection: For older ponds with poor bottom sediment quality, select the **granular form** (to sink and improve the pond bottom). For turbid water bodies, select the **powder form** (to induce flocculation and clarify the entire pond).
IV. Precautions and Contraindications
1.Prohibited Scenarios:Do not use in water bodies with a pH greater than 9.0. Do not use when dissolved oxygen levels are insufficient; ensure aerators are activated immediately after application [7].
2.Visual Inspection: Avoid purchasing inferior products characterized by a grayish color, foul odor, or poor water solubility (e.g., clumping or difficulty dissolving).
3.Expected Phenomena:It is normal for the water body to temporarily turn dark or turbid after application; it will gradually clarify within 1–2 days, returning to a clear and fresh appearance.
4.Storage Requirements:Store in a sealed container in a dry environment to prevent moisture absorption and clumping, which can compromise product efficacy.
V. Comparison of Common Product Forms
| Product Form | Advantages | Applicable Scenarios |
|---|---|---|
| Black Powder | Fast dissolution, good uniformity across the whole pond | Turbid water body, rapid algae control required |
| Spherical Granule | Strong sinking performance, long-lasting bottom improvement | Old ponds with black sediment and residual feed accumulation |
| Flake | Easy dosing and convenient storage | Small ponds, daily water conditioning |
VI. Key Distinctions from Mineral-Derived Potassium Fulvate (Reference for International Trade)
Sodium Humate: Specialized for aquaculture use; focuses on shading to control algae growth, as well as sediment improvement and detoxification. It is lower in cost and ideally suited for emergency response scenarios in high-density aquaculture operations.
Mineral-Derived Potassium Fulvate: A general-purpose product featuring higher biological activity (superior performance based on “Double 50” parameters). It focuses on promoting growth and supplementing nutrients, making it suitable for water fertilization and long-term water quality conditioning. For export, it is essential to verify the specific HS codes and fertilizer export control regulations applicable to the target market.
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References: 8 Source Documents
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