Up to ~100% oxygen transfer
Near-pure O₂ dissolves almost completely inside the cone under hydraulic pressure — no gas wasted, no bubbles escaping.
Dissolved oxygen cone
Push dissolved oxygen far past saturation — a downflow oxygen cone (Speece cone) that dissolves near-pure O₂ into the RAS flow at up to ~100% transfer efficiency, with no escaping bubbles, so high-density tanks hold the DO that paddle wheels and diffusers alone can never reach.
- Capacity5–100 m³/h
- O₂ transfer90–100% efficiency
- BuildHigh-strength FRP / food-grade PP
- O₂ sourcePSA generator / cylinder / LOX
ISO 9001 CE OEM / ODM
15+ years in aquaculture engineering · Trusted by Japfa Group, Japan Nissui & Tropo Farms · Shipped worldwide in one container
Product Description
Oxygen cone also called aeration cone, is aeration equipment specially designed for industrial aquaculture. Oxygen cones are used for mixing oxygen in the water. The shape makes the saturation efficiency very high, up to 95%. Water and oxygen enter at the top of the cone at relatively high speed. The stream of water pushes the oxygen bubbles down until they completely dissolve.
Advantage:
Because the water body of high-density aquaculture contains a lot of food and not enough time to remove manure and other organic fish, these organisms also consume large amounts of oxygen decomposition. The traditional way of oxygen such as air aeration has been unable to reach this level. The use of oxygen by increasing the amount of dissolved oxygen in water has become a powerful way to the urgent needs of the market. So, the Oxygen cone is specifically for industrial aquaculture aerobics designed as a device that provides high dissolved oxygen in the water for ultra-high density aquaculture.
Application
Specifications
Models & configuration
Model series integrated from industry practice — final specifications are confirmed by SIGMA's production line per project.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-DOC-5 | 5 m³/h (~5,000 LPH) | Small RAS modules | |
| SIGMA-DOC-10 | 10 m³/h | Mid-size recirculating systems | |
| SIGMA-DOC-20 | 20 m³/h | Commercial tank arrays | |
| SIGMA-DOC-50 | 50 m³/h (~50,000 LPH) | Large-farm units | |
| SIGMA-DOC-100 | 100 m³/h | Large farms / clusters |
| Working principle | Downflow cone (Speece cone) — pure oxygen injected at the top is held in a bubble cloud until dissolved |
|---|---|
| Oxygen source | PSA oxygen generator / O₂ cylinders / liquid oxygen (supplied separately) |
| Cone material | High-strength FRP / food-grade PP — corrosion-proof, seawater-ready |
| Water type | Freshwater / saltwater |
| Feed | Low-pressure pumped feed (model-specific) |
| Options | Online DO monitoring, oxygen flow meter, PLC closed-loop control, sight glass |
System composition
Super-saturated DO
Breaks through the air-saturation ceiling that surface aerators are limited to, enabling truly high stocking densities.
Far more DO per kWh
Compared with surface aeration, the oxygen cone delivers much more dissolved oxygen per unit of electricity — the economics behind high-density, low-exchange RAS.
FRP / PP corrosion resistance
Long service life in both fresh and salt water.
Closed-loop control ready
Pairs with a DO monitor and oxygen generator to hold target dissolved oxygen automatically.
Modular scaling
From a single cone to parallel banks as production grows.
No surface disturbance
Oxygenation happens inline, leaving the culture-tank surface calm.
Application
- High-density RAS for salmon, trout, sturgeon, tilapia, catfish and shrimp — core DO supply
- Sturgeon farms with high dissolved-oxygen demand
- Rapid re-oxygenation for live-fish holding and pre-transport
- Complete RAS oxygenation chain with oxygen generator, protein skimmer and biofilter
- DO stabilisation for premium cold-water species such as salmon
Video
Dissolved oxygen cone
FAQ
Frequently asked questions
How does a dissolved oxygen cone work?
It is a downflow gas-to-liquid reactor: water is pumped in at the narrow top while pure oxygen is injected at the same point. As the cone widens downward, water velocity drops to match the rising bubbles, holding them in a controlled bubble cloud until almost every molecule has dissolved.
How efficient is an oxygen cone?
Because the gas is consumed inside the cone under hydraulic pressure, oxygen transfer efficiency reaches up to ~100%, with no wasteful bubbles breaking the tank surface.
Why use an oxygen cone instead of paddle wheels or diffusers?
Paddle wheels and diffusers can only push DO up to air-saturation. An oxygen cone super-saturates the water with pure oxygen, delivering far more DO per kWh — what makes truly high-density, low-water-exchange RAS economically viable.
What is the oxygen cone made of?
The body is high-strength FRP or food-grade PP, corrosion-proof for both fresh- and sea-water, and it pairs with a dissolved-oxygen monitor and an oxygen generator for closed-loop control.
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View details →Request a tailored quote
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