FOAB Aquaculture Knowledge Hub
Curated technical guidelines, pond chemistry benchmarks, and biosecurity protocols developed by fisheries scientists and experienced commercial farmers to maximize yields safely.
Pond Water Chemistry Reference Benchmarks
Recommended operational thresholds for commercial freshwater grow-out ponds in Bangladesh.
| Parameter | Optimal Range | Critical Threshold | Corrective Action Guidance |
|---|---|---|---|
| Dissolved Oxygen (DO) | 5.0 – 8.0 mg/L | < 3.0 mg/L (Stressing) | Deploy paddlewheel aerators between 02:00 and 06:00 when algae consume oxygen. |
| Pond pH | 7.5 – 8.5 | < 6.5 or > 9.2 | Apply agricultural lime (CaCO3) at 1–2 kg/decimal if acidic; use gypsum or molasses if excessively alkaline. |
| Total Ammonia Nitrogen (TAN) | < 0.05 mg/L (Un-ionized NH3) | > 0.2 mg/L | Reduce feed ration by 30%, increase aerator agitation, and dose verified Bacillus probiotics. |
| Total Alkalinity | 100 – 180 mg/L (as CaCO3) | < 50 mg/L | Buffer pond water with dolomite or agricultural lime to stabilize diurnal pH swings. |
Dissolved Oxygen Dynamics in Semi-Intensive Carp Ponds
A practical field guide on calculating biological oxygen demand (BOD), aerator placement, and pre-dawn emergency aeration strategies during monsoon humidity spikes.
Probiotics vs. Prophylactic Antibiotics: Modern Biosecurity Protocols
Why prophylactic antibiotic use induces antimicrobial resistance and causes export rejections. Practical steps for colonizing pond benthic layers with beneficial bacteria.
Extruded Floating Feed Management and Feed Conversion Ratio (FCR) Optimization
How to calculate feeding rates based on seasonal water temperature changes and maintain FCR between 1.2 and 1.5 in commercial Rui and Katla grow-out ponds.
Nursery Pond Conditioning & Fry Acclimatization Before Release
Step-by-step liming, fertilization, predator netting, and temperature equalizing methods to achieve over 85% fingerling survival rates.