Fish Dying at Dawn in a Pond? Low Oxygen Causes, First Actions and Aeration Checks
Why pond fish and shrimp die or gasp at dawn, what to do in the first hour, a cause-finding decision tree and a worked night oxygen budget with labeled assumptions.
Dissolved Oxygen Sensors for Fish and Shrimp Farms: Optical vs Galvanic vs Polarographic
Compare optical, galvanic and polarographic dissolved oxygen sensors for ponds, tanks and RAS: pros and cons, limitations, placement, alarms and a buyer selection checklist.
RAS Biofilter Sizing, Water Quality and Start-Up: Buyer Guide
A new RAS needs proven biological treatment capacity before full stocking—not just installed equipment. Use this buyer guide to specify commissioning, compare quotes and coordinate fish deliveries with biofilter readiness.
Aquaculture Water Quality Testing Lab Equipment: A Commercial Sourcing Guide
Learn how to select the right handheld meters, photometers, and online probes for commercial fish and shrimp farms to ensure precise water quality management.
UV and Ozone Disinfection Equipment for Aquaculture: Where Each Fits and How to Compare Quotes
UV suits clear, downstream flows like RAS loops and hatcheries; ozone suits intake and higher-organic-load water needing oxidation. Compare quotes on full scope, not price alone.
Aquaculture Effluent and Sludge Management: Drum Filters, Settling, Dewatering and Wetlands Explained
How to specify drum filters, settling, sludge dewatering and constructed wetlands for aquaculture effluent, and how to compare supplier offers on equal terms.
Water Quality Management in Commercial Aquaculture
Alkalinity, pH, TAN, nitrite, CO2 and salinity are not monitoring metrics — they are design constraints. A working guide to the water quality parameters that determine whether a commercial aquaculture project performs as planned.
Aquaculture Filtration: Mechanical, Biological and Disinfection Explained
Define intake, recirculation and effluent treatment duties; compare flows, pollutant loads, operating conditions, energy, acceptance tests and scope boundaries.
Aquaculture planning benchmarks
| Figure | Value | Context |
|---|---|---|
| CAPEX — RAS | USD 9,000–14,000 per tonne/yr | Global baseline before country cost factor. |
| CAPEX — Ponds | USD 1,800–4,000 per tonne/yr | Lined or earthen ponds, excluding land. |
| CAPEX — Cages | USD 2,500–5,500 per tonne/yr | Cages, moorings, nets and service equipment. |
| CAPEX — Flow-through | USD 4,000–7,000 per tonne/yr | Raceways and water intake works. |
| Energy use | RAS ~6 kWh/kg; ponds ~1.2; flow-through ~1.5; cages ~0.3 | Per kg of fish produced. |
| Typical FCR | Trout 1.1; salmon 1.2; shrimp 1.4; tilapia 1.6; carp 1.8 | kg feed per kg growth; varies with feed and management. |
| Farm size where FishMatch reviews projects | From ~USD 250,000 total project value | Commercial fish and shrimp projects. |
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