Critical
Low Dissolved Oxygen
Dissolved oxygen (DO) is the single most critical water-quality parameter in aquaculture. When levels drop below species-specific thresholds, fish suffocate — often overnight with no visible warning. Early detection with a reliable DO meter is the difference between a minor adjustment and a total loss.
Symptoms & Signs
- Fish gasping at the surface in early morning
- Clamped fins and erratic swimming
- Sudden mortality events overnight
Common Causes
- High water temperature reduces oxygen solubility
- Overstocking exceeds the aeration capacity of the system
- Algae die-off and decomposition consume oxygen
Species & Temperature Context
Water-quality parameters vary significantly by species, water temperature, production system, and local regulations. The ranges shown throughout this site are general guides based on common aquaculture species (tilapia, catfish, shrimp, trout). Always verify parameters for your specific species with a local aquaculture extension service or research institution before making management decisions.
Recommended Tools
Top Products for This Problem
| Check Price | ||||||
|---|---|---|---|---|---|---|
| DO-METER-PROFESSIONAL-500 | 0–20 mg/L | Two-point (0 mg/L, air saturation) | Optical (luminescence quenching) | IP67 (submersible to 1 m / 30 min) | $$ | Check Price |
| AERATION-PUMP-1200 | Airflow: 120 L/min at 0.2 bar | N/A | Diaphragm compressor | IP44 (indoor enclosure; outdoor with shelter) | $$ | Check Price |