Importance of Dissolved Oxygen Management
High-temperature weather poses a serious challenge to dissolved oxygen (DO) management in aquaculture. Rising temperatures not only lower the oxygen saturation capacity of water but also significantly increase oxygen consumption. Therefore, scientific management of dissolved oxygen is critical for successful fish and shrimp farming.
Operations That Increase Oxygen Consumption and How to Prevent Them
1. Overfeeding
Cause & Effect:
Excess feed settles at the pond bottom, where microbial decomposition consumes large amounts of oxygen. This leads to oxygen depletion in bottom layers, encourages harmful bacteria, and generates toxic substances.
Recommendation:
Control feeding strictly. Follow the principle of “small portions, multiple times,” and adjust based on feeding response. Reduce or stop feeding during hot, humid days or before thunderstorms.
2. High Stocking Density
Cause & Effect:
Overcrowding increases respiration and oxygen demand. The oxygen load may exceed the pond’s capacity, causing oxygen depletion, fish surfacing, or even mass mortality.
Recommendation:
Plan stocking density carefully. During high-temperature weather, consider partial harvesting or transferring fish to other ponds to reduce density.
3. Improper Use of Aerators
Cause & Effect:
Starting aerators only during visible oxygen stress misses the best timing for oxygen supplementation and water quality improvement.
Recommendation:
Follow the “three on, two off” principle: run aerators at noon on sunny days, early morning on cloudy days, and at midnight during continuous cloudy/rainy weather. Avoid running them at sunset or noon on cloudy days (but emphasize the importance of noon operation).
👉 For maximum efficiency, choose our Impeller Aerators or Double Speed Wave Maker Aerators, which ensure both oxygenation and water circulation.
4. Excessive Fertilization
Cause & Effect:
Organic fertilizer decomposition consumes oxygen. Improper use of inorganic fertilizers can cause algal blooms, which consume large amounts of oxygen at night or during cloudy weather.
Recommendation:
Avoid organic fertilizers in high-temperature weather. If necessary, use fully fermented fertilizer in small, multiple doses. Apply inorganic fertilizers evenly and monitor phytoplankton and water color closely.
5. Stirring Bottom Sediments
Cause & Effect:
Netting fish or exchanging large volumes of water stirs bottom mud, releasing reducing substances into the water and rapidly consuming oxygen.
Recommendation:
Avoid such operations in hot, low-pressure, or humid weather. Perform them during cooler times when DO is higher, and run aerators in advance.
6. Introducing Low-Oxygen or Polluted Water
Cause & Effect:
Adding water with low DO or high organic matter dilutes pond oxygen or introduces new oxygen-consuming substances.
Recommendation:
Test water sources before use. If DO is low, apply aeration treatment before pumping into ponds.
👉 Our Roots Blowers are ideal for aerating incoming water sources to maintain healthy DO levels.
7. Overuse of Chemicals
Cause & Effect:
Some disinfectants and pesticides are strong oxidizers that consume oxygen. Dead organisms from chemical treatments also increase oxygen demand during decomposition.
Recommendation:
Apply chemicals strictly according to instructions. Avoid use at noon during hot, sunny days. Strengthen aeration after treatments and monitor fish behavior closely.
Conclusion & Best Practices
During high-temperature weather, aquaculture success depends on effective dissolved oxygen management. Avoid overfeeding, overcrowding, improper aerator use, excessive fertilization, bottom disturbance, low-oxygen water intake, and chemical misuse.
Instead, ensure proper feeding strategies, controlled stocking density, timely aerator operation, careful fertilization, and safe water management.
Above all, use reliable aeration equipment such as Paddle Wheel Aerators, Impeller Aerators, Air Jet Aerators, and Roots Blowers to maintain optimal DO levels. Combined with regular water quality monitoring, these measures provide a healthy environment for fish and shrimp, ensuring higher yields and sustainable farming.
