Dissolved Oxygen (DO) is oxygen that dissolves in water, making it available for the organisms living within. For fish and other aquatic life, dissolved oxygen is like the breath of life. Adequate levels of dissolved oxygen support a healthy aquatic ecosystem and the survival of aquatic organisms
The Impact of Dissolved Oxygen on Freshwater Fish
The level of Dissolved Oxygen (DO) in water reflects its quality. Various factors such as water mixing, photosynthesis, respiration, pollution, salinity, and water temperature significantly affect DO concentration.
Changes in DO levels can have a substantial impact on fish health. Fish and other aquatic organisms need dissolved oxygen to breathe, reproduce, and maintain their metabolism. Dissolved oxygen enters the water through diffusion from the air and aquatic plant photosynthesis.
The Importance of Dissolved Oxygen in Aquaculture
- Growth and Metabolism: DO is an essential element in fish metabolism. Optimal DO levels (8-8.5 mg/L) support optimal fish growth. Low DO concentrations (<8 mg/L) can hinder the development of fish eggs and larvae.
- Respiration and Survival: Fish absorb oxygen from water through their gills. Low DO levels make it difficult for fish to breathe, causing stress and leading to death.
- Reproduction and Health: Adequate DO supports healthy fish reproduction. A lack of oxygen can lead to health and immune system problems, making fish more vulnerable to disease.
- Water Quality and Environment: DO is an indicator of water quality. High-quality water supports a healthy ecosystem, which is vital for the survival of fish and other aquatic life.
Factors Affecting Dissolved Oxygen
- Water Temperature: Cold water holds more oxygen than warm water. As water temperature rises, fish require more oxygen.
- Salinity: Freshwater can absorb more oxygen than saltwater. This is crucial in freshwater fish farming, such as in lakes.
- Microorganism Activity: Bacteria and algae can reduce DO levels. Decomposing algae also consumes oxygen, leading to a decrease in DO.
- Photosynthesis of Aquatic Plants: Aquatic plants produce oxygen as a result of photosynthesis, increasing DO levels during the day.
Measuring and Maintaining Dissolved Oxygen
DO levels are measured using a DO meter. Fish gasping for air at the surface is a sign of low DO levels in the area, requiring immediate action. Pumps or aerators can be used to increase oxygen levels in the water.
Regal Springs Indonesia Tilapia: Raised in Oxygen-Rich Waters
Regal Springs Indonesia, a pioneer in sustainable tilapia farming in Indonesia, understands the importance of dissolved oxygen for fish health and water quality. Therefore, the company raises its tilapia in oxygen-rich waters such as Lake Toba.
Lake Toba, the largest volcanic lake in the world, offers clear, deep, and oxygen-rich water. This environment is ideal for raising healthy and high-quality tilapia. Regal Springs Indonesia’s tilapia are raised without antibiotics or chemicals and are fed high-quality feed. As a result, their tilapia:
- Healthier and More Nutritious: The high oxygen content in Lake Toba produces healthier tilapia rich in nutrients.
- Better Taste: Tilapia raised in oxygen-rich water have a firmer texture and fresher taste.
- Environmentally Friendly: Regal Springs Indonesia’s sustainable farming practices minimize environmental impact.
