High walls, deep water
Deeper and larger than a holding box, carrying a full culture stocking density for real grow-out.
Rectangle fish tank
A land-based rectangular pond that grows fish — a deeper, larger-footprint rectangular fish tank for intensive grow-out of tilapia, catfish and ornamentals, built like a raceway in PVC-liner, FRP and steel-frame versions with bottom drains and high walls, that fits neatly along a wall, greenhouse or rooftop and can be plumbed into a RAS.
- Sizes2–50 m long · ~2.5–3,750 m³
- MaterialsPVC / TPU liner · FRP · HDPE
- DrainageSloped floor · center / end drain
- UseLand-based grow-out · RAS-ready
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
The Rectangle fish tank is designed to supply aquaculture anywhere needed and immediately available.
The tanks are easy installation. The wide range of optional features and the possibility of customized, suitable for different indoor and outdoor applications.
Advantage:
1) High tenacity polyester yarns with PVC coating, 3 layers Material, it is more lifetime ;
2) Good strength, good flexibility
and adhesion strength;
3) Outstanding tearing strength for welding;
4) The material is Anti-UV, anti-leaking, Anti-bacteria，
Anti-Fouling, Anti- acid& alkali, corrosion resistance, Shock resistance and etc…
5) The temperature is suitable from -40 to +90
degree.
6)It can be folded when empty, the weight is light and easy to transport, on-site installation is simple, long life, and has low
maintenance costs.
Video of Product
Application
Specifications
Models & configuration
Indicative sizes integrated from the standard range — length, width, depth, material and drainage are confirmed per order by SIGMA.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-RFT-2 | ~2.5 m³ (2.0 × 1.0 × 1.2 m) | Small grow-out / holding | PVC-lined frame / FRP |
| SIGMA-RFT-3 | ~5.5 m³ (3.0 × 1.5 × 1.2 m) | Standard grow-out | PVC / TPU-lined frame |
| SIGMA-RFT-4 | ~10 m³ (4.0 × 2.0 × 1.2 m) | High-density grow-out | Steel frame, TPU liner |
| SIGMA-RFT-6 | ~14.5 m³ (6.0 × 2.0 × 1.2 m) | Large grow-out | Steel frame, TPU liner |
| SIGMA-RFT-50 | ~3,000–3,750 m³ (50 × 50 × 1.2–1.5 m) | Largest single pond | Steel frame + TPU / HDPE liner |
| SIGMA-RFT-C | Per order (L × W × H) | Custom | PVC / FRP / HDPE |
| Materials | PVC tarpaulin-lined steel frame / TPU / FRP fiberglass / HDPE |
|---|---|
| Shape | Rectangular — high walls, deep water, built for grow-out |
| Floor | Sloped to a central or end bottom drain |
| Drainage | Center / end drain + overflow standpipe; dual-drain layout for RAS |
| Options | Inlet, aeration ports, replaceable liner, insulation, ladder |
| Species | Tilapia, catfish, carp, ornamental fish |
| Working conditions | Grow-out, biofloc, backyard / greenhouse / rooftop — indoor or outdoor; freshwater (saltwater-resistant build optional) |
System composition
Straight edges save space
Lines up along walls, greenhouses and rooftops — maximum water volume in a tight, straight footprint.
Multiple materials
PVC-lined frame, TPU, FRP or HDPE versions to match budget and service life.
Drains built for harvest
Sloped floor to a central or end drain makes waste removal and harvesting easy.
Replaceable liner
Keep the steel frame and swap the membrane — low long-term cost.
Made to order
Length, width, depth, material and drainage all customizable; dual-drain RAS plumbing available.
Application
- Land-based grow-out of tilapia, catfish and carp
- Indoor / outdoor raceway-style intensive culture
- RAS-connected land-based grow-out tanks
- Backyard, greenhouse and rooftop farming along walls (space-saving straight edges)
- Rectangular biofloc tanks for small-commercial farmers
Video
Rectangle fish tank
FAQ
Frequently asked questions
What is a rectangle fish tank used for?
It is a land-based, raceway-style grow-out vessel for intensive culture of tilapia, catfish, carp or ornamental fish, built on the ground rather than floating in open water.
Why choose a rectangular shape?
A long-rectangular tank gives maximum water volume in a tight, straight footprint — fitting neatly along a wall, inside a greenhouse or on a rooftop where a round tank would waste space.
What materials is it built from?
It is available in PVC/TPU-lined steel frame, FRP (rigid gel-coat) and HDPE versions, with high walls for stocking depth and a sloped floor to a central or end bottom drain for waste removal.
Can the rectangle tank run inside a RAS?
Yes — a dual-drain layout lets the tank run inside a RAS for intensive, low-water culture, pairing with SIGMA’s filtration and aeration line.
Related equipment
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HDPE Fish Tank
Durable HDPE fish-farming tanks — on-site welding, 15-year liner, lower cost than earthen ponds. Any diameter & depth. SIGMA ships worldwide. Get sizes & a quote in 12h.
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FRP Fish Tank
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RAS system
Complete recirculating aquaculture (RAS) systems: drum filters, biofilters, oxygen cones, pumps & monitoring. Custom-designed for your species & volume. Manufacturer-direct. Get a quote.
View details →Request a tailored quote
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