I. Core Application Methods: Two Main Dosing Approaches
Dosing in Recirculating Aquaculture Systems (Recommended)
is the most commonly used method in large-scale aquaculture. Ozone is added to the water
circulation treatment
process of the aquaculture system, without direct contact with farmed organisms.
Process:
a.First, the aquaculture pond water enters a sedimentation tank to remove large-particle
impurities;
b.The water then flows through an ozone contact tower or mixer for full reaction with ozone
(contact time: approximately 5-10 minutes);
c.The reacted water enters an aeration tank, where residual ozone is removed through
aeration (duration: 10-15 minutes);
d.After testing confirms that the residual ozone in the water is ≤ 0.02 mg/L, the water is
returned to the aquaculture pond.
Applicable Scenarios: Industrial recirculating aquaculture systems, high-density fish and
shrimp culture ponds.
2. Direct Spraying / Bottom Injection (Emergency or Auxiliary Use)
This method is suitable for emergency treatment of pond aquaculture or regular sediment
improvement, with strict control over dosage and timing required.
Operational Process:
a.First, ozone is dissolved into a small amount of water using a gas-liquid mixing pump to
prepare high-concentration ozone water (concentration: approximately 5-10 mg/L);
b.On sunny days, spray the ozone water evenly onto the pond surface in the morning or
evening (avoiding the molting period of shrimp and crabs);
c.After spraying, turn on the aerator to accelerate ozone decomposition and water
convection.
Applicable Scenarios: Emergency response to water quality deterioration in pond aquaculture,
regular disinfection during high-temperature periods, improvement of black and odorous
sediment.
II. Key Application Dosages: Classified by Scenarios and Species
Aquatic animals in different scenarios have varying tolerance levels, leading to significant
dosage differences. The following are general reference values, and specific dosages need to
be adjusted based on actual water quality.
| Application Scenario | Recommended Ozone Dosage (based on water volume) | Key Requirements |
|---|---|---|
| Daily Purification of Recirculating Water | 0.3-0.5 mg/L | Residual ozone after reaction ≤ 0.02 mg/L |
| Disease Prevention and Control Disinfection | 0.8-1.2 mg/L | Used only for a short period (2-3 consecutive days) during disease outbreaks |
| Emergency Pond Water Quality Regulation | 0.5-0.8 mg/L (spraying) | Single spray volume should not exceed 1/3 of the total pond water volume |
| Sediment Improvement | 1.0-1.5 mg/L (bottom injection) | Dosed via bottom aeration discs, 1-2 times per month |
Special Precautions for Different Species:
A.Fish (e.g., Grass Carp, Sea Bass): They have relatively high tolerance and can be treated
with general dosages. Focus on observing gill reactions—if fish surface for air (a sign of
oxygen deficiency), stop ozone application immediately.
B.Shrimp (e.g., Pacific White Shrimp): Tolerance is low during molting and larval stages.
Reduce the dosage by 30% and avoid application during peak molting periods.
C.Crabs (e.g., Chinese Mitten Crab): More sensitive to ozone. The spraying dosage in ponds
should not exceed 0.5 mg/L, and application during high-temperature noontime should be
avoided.
The above is for reference only.