Holding & quarantine
A frame-supported fish holding tank for harvested, incoming or pre-sale stock — set up beside ponds, hatcheries or packing areas in hours, not weeks.
Rectangle Aqua Tank
A rectangular fish tank for the working side of the farm — holding, grading and moving live fish, or slotting in as a space-saving module tank inside a recirculating aquaculture system (RAS). The food-grade 3-ply PVC tarpaulin liner sits in a steel support frame, assembles without tools and folds flat for transport. Need grow-out cages for open water instead? See our floating fish cage.
- LinerFood-grade 3-ply PVC tarpaulin, UV-resistant
- FrameSteel support frame · tool-free assembly
- SizesMade to order — L × W × H per project
- DutyHolding · grading · live transport · RAS module
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
Tarpaulin tank for Freshwater/Seawater Cultivation
Farming with tarpaulin fish tanks has become increasingly popular nowadays. Because the fish farming business is so tempting in the eyes of the public. With the development of the era and the narrower land used for fish farming, various new innovations have been found as a substitute for land for cultivation.
One way is to use a tarpaulin fish tank. Cultivation using this tank itself is more widely used because of the many advantages it gets. For example, with narrow land or limited land, it can be replaced with this one media that can be installed on the ground.
Advantage:
★Easy to assemble!
★Movable and transferable to anywhere you want!
★No more breaking your back moving bulky and heavy through tanks!
★Nontoxic, food grade, UV resistant, antioxidative, thermostable, cold resistant.
★Stretch-Proof, resistant to stripping, antibacterial, acid & alkali resistant.
★Durable and Non-Distortable.
★3-ply nontoxic rubber synthetic fiber PVC with screen mesh for added protection.
★In case of accidental, ex. knife puncture etc. repair kit is available.
★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
Package and Shipment
Specifications
Models & configuration
Every rectangular aqua tank is made to order — final dimensions, liner gauge and fittings are confirmed by SIGMA per project before shipment.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-RAT-H | Sized to order (L × W × H) | Holding / quarantine tank | Food-grade 3-ply PVC liner + steel support frame |
| SIGMA-RAT-G | Sized to order (L × W × H) | Grading / sorting tank | Screen-mesh reinforced PVC liner + steel frame |
| SIGMA-RAT-T | Sized to order (L × W × H) | Live-fish transport turnaround | Foldable lightweight liner, field repair kit available |
| SIGMA-RAT-R | Sized to order (L × W × H) | RAS module tank | Liner + frame, arranged in rows inside RAS rooms |
| SIGMA-RAT-C | Custom L × W × H | Multi-tank batteries | Straight-edge units abut to share floor space |
| Liner material | 3-ply non-toxic rubber synthetic-fibre PVC tarpaulin with screen mesh for added protection |
|---|---|
| Liner properties | Food grade, UV-resistant, antioxidative, thermostable, cold-resistant |
| Durability | Stretch-proof, resistant to stripping, antibacterial, acid & alkali resistant |
| Shape | Rectangular / square — straight-edge, space-efficient footprint on narrow or limited land |
| Frame | Steel support frame; simple on-site assembly, no special tools |
| Mobility | Folds when empty — lightweight, easy to transport and relocate; low maintenance cost |
| Repairs | Field repair kit available for accidental punctures (e.g. knife cuts) |
| Sizes | Made to order — length × width × height specified per project |
| Water | Freshwater and seawater cultivation duty |
| Typical duty | Holding / quarantine, grading and sorting, live-fish transport turnaround, RAS module tank |
System composition
What this rectangular fish tank does best
Grading & sorting
The straight-sided rectangular footprint keeps netting runs short, so batches are graded and sorted faster than in a round tank of the same volume.
Live-transport turnaround
Folds flat when empty and weighs little — a practical fish transport holding tank to stage live fish before loading, with a field repair kit available.
RAS module tank
Straight edges let rows of rectangular tanks share floor space inside a recirculating aquaculture system room, where round tanks waste corners.
Food-grade 3-ply PVC liner
Non-toxic, food-grade, UV-resistant 3-ply PVC tarpaulin with screen mesh reinforcement — antibacterial and acid & alkali resistant.
Tool-free assembly
Frame plus liner build on any flat ground — easy to assemble, movable and transferable to wherever the farm needs it next.
Application
Where farms use rectangular aqua tanks
- Holding and quarantine of live fish at hatcheries, farms and live-fish markets
- Grading and sorting batches before stocking, transfer or sale
- Staging tanks for live-fish transport and purging before shipment
- Space-saving module tanks inside recirculating aquaculture systems (RAS)
- Temporary or seasonal rectangular fish tanks on narrow or limited land, freshwater or seawater
Video
Rectangle Aqua Tank
FAQ
Frequently asked questions
What is a rectangular aqua tank used for?
A rectangular aqua tank is a frame-supported tarpaulin fish tank used for holding and quarantining live fish, grading and sorting batches, staging fish for live transport, and as a compact module tank inside a recirculating aquaculture system (RAS). Its straight-edge footprint fits narrow spaces where a round tank wastes floor area.
Is this a floating fish cage?
No — this is a land-based rectangular fish tank that stands on the ground in its own frame. For cage farming in lakes, reservoirs or sheltered sea water, see our floating fish cage page instead; SIGMA supplies both and will recommend the right one for your site.
What is the tank made of?
The liner is a 3-ply non-toxic rubber synthetic-fibre PVC tarpaulin with screen mesh for added protection — food grade, UV-resistant, antioxidative, thermostable and cold-resistant — supported by a steel frame that assembles on site without special tools.
Can it work as a RAS module tank?
Yes. The rectangular shape lets rows of tanks share floor space inside a recirculating aquaculture system room, so it is widely used as a holding, grading or culture module tank; pipework and fittings are confirmed per project.
What sizes are available?
Rectangular aqua tanks are made to order — you specify length, width and height per project, and SIGMA confirms final dimensions, liner gauge and fittings before shipment, for freshwater or seawater duty.
How is it shipped and installed?
The liner folds when empty and the whole tank is light, so it ships compactly and installs quickly on any flat ground — easy to assemble, movable, and supported by a field repair kit in case of accidental punctures.
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View details →Request a tailored quote
Tell us your species, target density and site — our engineers size the system and reply within one business day.
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