In Recirculating Aquaculture Systems (RAS), water is reused continuously, creating a high-risk environment for pathogen buildup, biofilm formation, and disease outbreaks. Proper sterilization and disinfection are non-negotiable for maintaining fish health, system stability, and profitability.
Sterilization & Disinfection Are Essential
1. Prevents Disease Outbreaks
Pathogens (bacteria, viruses, parasites) multiply rapidly in closed systems.
Biofilms (slime layers on pipes/tanks) protect harmful microbes from treatments.
Example: Vibrio (shrimp), Ichthyophthirius (freshwater fish), and Aeromonas can wipe out entire stocks.
2. Controls Organic Waste Breakdown
Dissolved organics (fish mucus, uneaten feed, feces) promote bacterial growth. Without disinfection, these organics decompose into ammonia & nitrite, stressing fish.
3. Improves Water Clarity & Oxygen Levels
Suspended particles & algae reduce light penetration and oxygen exchange. Ozone & UV sterilization break down organic matter, improving water quality.
4. Reduces Antibiotic Dependency
Overuse of antibiotics leads to drug-resistant bacteria.
Proactive disinfection (UV, ozone, chlorine) minimizes disease risks without antibiotics.
5. Maintains Biofilter Efficiency
Excessive organic sludge clogs biofilter media, reducing nitrification. Partial disinfection (e.g., ozone) helps control bacterial overgrowth without killing beneficial nitrifying bacteria.