HDPE rides the waves
UV-stabilised HDPE collars are corrosion-free and flexible enough to absorb wave energy, rated for a long service life in fresh and salt water.
Float Cage
UV-stable HDPE floating fish cages carry a wave-flexible collar, handrail, mooring set and graded net pen in one site-assembled package. Round collars in diameters from 6 to 12 m suit open water; square pontoon modules work in sheltered lakes and rivers. Species range from tilapia in freshwater to grouper and snapper inshore.
- FrameUV-stable HDPE · 2–3 rings
- RoundØ 6 / 8 / 10 / 12 m
- Square3×3 – 5×5 m modules
- Mesh~8–40 mm graded net
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
Fish Cage is made from HDPE tubular product and cage fitting, using foreign imported special-cage purpose polyethylene raw material. This kind of tubular product has good strength and tenacity. Using a unique structure design by our company, the frame will have the ability to resist stormy waves, meanwhile, all frame materials go through the ultraviolet rays aging resist and seawater corrosive resist process, and the service life is over 15 years.
According to customer demand, the circumference is from 30m to 160m, and the net depth is from 5m to 30m. Effective farming up to 30,000 m3.
Advantage:
- Framework: Polyethelene Tube with reliable strength, elasticity, and ductility.
- Fixed System: Timber Pile, Anchor Pile, Cement Concrete Pile, according to the geology condition of the cage location.
- Netting: use PE/ Polyester/ Nylon knotless nets, which have strong adhesion resistance and aging resistance.
Video of Product
Application
Package and Shipment
Specifications
Models & configuration
Dimensions and mesh sizes are the standard configurable range — final cage specification is confirmed by SIGMA per project.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-FC-R6 | Ø 6 m round | Small grow-out / sheltered water | UV-resistant HDPE double / triple ring + netting |
| SIGMA-FC-R10 | Ø 10 m round | Standard open-water culture | UV-resistant HDPE double / triple ring + netting |
| SIGMA-FC-R12 | Ø 12 m round | Large nearshore culture | UV-resistant HDPE triple ring + netting |
| SIGMA-FC-S | 3×3 / 4×4 / 5×5 m square | Sheltered lake/reservoir · walkway for easy management | Pontoon walkway modules + netting |
| SIGMA-FC-ARRAY | Modular linked array | Large commercial farming zones | Round / square modules + mooring system |
| Floating collar | UV-stabilised HDPE pipe, double or triple ring — corrosion-free and wave-flexible |
|---|---|
| Shapes | Round (open-water, wave-riding) / square (modular pontoon walkways for sheltered water) |
| Round sizes | Ø 6 / 8 / 10 / 12 m common (circumference customisable) |
| Square modules | 3×3 / 4×4 / 5×5 m units, joined into arrays |
| Net pen | Knotless nylon / HDPE netting; predator and bird net optional |
| Mesh size | Fingerling ~8–15 mm · grow-out 20–40 mm |
| Package | Floating collar + handrail/stanchions + mooring/anchor set + net — complete, site-assembled |
| Waters & species | Lakes / reservoirs / rivers / inshore sea — tilapia, snapper, grouper, sea bass and similar |
System composition
Round or square to suit the water
Round collars for open, wave-exposed water; square pontoon-walkway modules for sheltered lakes and rivers.
Complete package, site-assembled
Collar, handrail, mooring/anchor set and net ship together, ready to assemble on site.
Graded net pens
Mesh sized to the fish — fine for fingerlings, larger for grow-out — with predator and bird net options.
Modular expansion
Scale from small grow-out modules to large commercial arrays by joining units.
Multi-species, fresh and salt
Suits tilapia, snapper, grouper, sea bass and similar species across freshwater and marine sites.
Application
- Lake and reservoir cage culture — tilapia as the lead species
- Flowing-water cages in rivers
- Inshore and estuary marine cages for grouper, snapper and sea bass
- Fingerling holding and grading cages
- Cage feeding paired with automatic fish feeders
Video
Float Cage
FAQ
Frequently asked questions
What is a floating fish cage used for?
Cage culture lets a farm raise fish in lakes, reservoirs, rivers and inshore sea without building tanks. SIGMA’s floating cages combine buoyant HDPE collars, a walkway railing, a mooring system and a graded net pen.
Should I choose a round or square floating cage?
Round collars are the classic open-water form built to ride waves, while square modular pontoon-walkway cages suit sheltered water; both scale from small grow-out modules to large commercial arrays.
What net mesh size is used?
The net pen hangs inside with mesh sized to the fish — fine (~8–15 mm) for fingerlings and larger (20–40 mm) for grow-out — typically knotless nylon or HDPE netting with a predator and bird net option.
What species can be farmed in floating cages?
It suits tilapia, snapper, grouper, sea bass and similar across freshwater and inshore marine operations.
What is in a complete cage package?
The floating collar, handrail / stanchions, mooring / anchor set and net, ready to assemble on site.
Where can I buy floating fish cages, and what is pen fish farming?
Floating fish cages for sale from SIGMA ship as a complete kit — collar, handrail, mooring set and net — ready to assemble at your site; round and square formats cover open and sheltered water respectively. Pen fish farming is a related but distinct method that encloses a section of shoreline or shallow water with stake-mounted netting rather than a floating structure — SIGMA's floating cage fish farming systems fit open water, deeper sites, or locations where the bottom can't be staked.
Do you supply aquaculture cage nets and fish farm cage nets separately from the cage frame?
Yes — aquaculture cage nets and fish farm cage nets are supplied both as part of a complete floating cage package and separately for re-netting an existing cage. See our fishing nets page for cage liner nets made to your exact cage dimensions, in the same knotless nylon or HDPE material.
Related equipment
Related equipment
Fishing Nets
Strong aquaculture fishing nets, seine & harvest nets for fish & shrimp farms — knotless options, custom mesh & length. Factory-direct from SIGMA. Request sizes & a quote.
View details →
Feeding machines
Automatic & smart fish-feeding machines for ponds, cages & RAS — programmable timing, even broadcast, saves labor & feed. Multiple capacities from SIGMA. Get a quote.
View details →
Fish Shrimp Feed
High-protein floating & sinking feed for tilapia, shrimp & carp — optimized FCR, stable in water, full size range. Bulk aquafeed supply from SIGMA. Request details & a quote.
View details →
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.
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.
Float Cage Request a Quote