Aquaculture Technology

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Pontoons - Cages - Nets - Boats


Maritime Technic - Pontoon SystemMODULAR FLOATING DOCK SYSTEM for aquatic sports, aquaculture and environmental protection

25 years experience in "state of the art" flotation engineering worldwide, together with cutting edge technology and the most advanced production techniques are the base for the new, extremely versatile "Pontoon Building - Block System". By utilizing the friction co-efficient achieved by independently controlled flooding of the modules we have refined this system to provide not only the most stable floating platform available, but also a high load capacity, which can also be combined with a fender-sidebar system.
The individual modules are easy to handle (weight: 6.2 kg) and have a very high load capacity of 360 kg/m2 (=75 lbs./sq. ft.). They are made of a high-quality synthetic, UV-stabilized and anti-static material (green or blue), which is extremely resistant to the elements. Individual blocks measure 50x50x50 cm (1.65x1.65x1.65 ft.) and the standard freeboard is approximately 40 cm. Blocks are easily assembled (with an assembling wrench) by joining the connecting lugs with bolts that give a secure and stable connection.
These building blocks can be assembled to meet any desired layout or dimensions, and can be used to replace or extend existing pontoon systems. This seawater- and acid-resistant system requires no maintenance or cleaning and is extremely durable. It can be utilized throughout the year or the modules can be stacked and stored. Unlike closed floats, this system does not blow up in the sun and is resistant to attacks from Teredinidae.
Unlike conventional wooden floats, the pontoons are made of a skid-proof material, and will not rot or develop sharp edges, or expose rusty nails etc. The "Maritime Technic - Pontoon System" contributes to water purity and is aesthetically pleasing. It has lugs (ears) along the sides where different accessories can be fitted and anchoring systems attached.

Swimming ladders safety rails, anchor fastening and and boat -mooring-eyes are the main accessories, with options such as side screws and bars as well as fenders, ropes and anchors. If needed, access ramps and gangways can be produced to the customer’s design. For marinas electricity distributors (w/wo illumination) and water supply-systems are available.

More infos and photos

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CIRCULAR NETCAGES for all conditions

Circular NetcagesWe supply a wide range of single, double and triple ring cage collars, using black high density polyethylene (HD-PE 100) pipes in various thickness (SDR 22-11) and sizes from 200 to 500 mm Ø, optional mounted with either dip galvanized steel or injection molded plastic brackets (mounted usually every 2-3 m). All build with heavy gauge handrail and upright pipe (110-160 mm Ø) to resist deformation. The tailor-made circular cages or pens with a diameter from 10-60 m or 30-200 m circumference can be prepared for all types of weather and sea conditions from sea-bay to offshore sites. A safety chain inside the outer pipe ring and polystyrol cylinders or dividing plates welded inside the inner pipe ring, are available for safety reasons. A full circumference walkway decking is available optionally. A bird net stand, a dead fish collector and a sinker tube ring are available as accessories. The cage pipes are shipped in parts and are welded on site. The following diameters are recommended:


Floats Railing
<20 m 200-250 mm 110-125 mm
20-40 m 250-315 mm 125-140 mm
>40 m 450-500 mm 140-160 mm

Square net cages of any size we produce with our:

Pontoon System


SUBMERSIBLE NETCAGES for offshore farming

Submersible Offshore CagesThis "Vineta" cages are developed for industrial farming of various fish species (i.e.: Seabass, Seabream, Grouper, Salmon, Sturgeon etc.) all the year round at exposed open water areas such as seas and oceans. To prevent damage from storm impact and to provide optimum conditions for fish farming, the cage can be submerged. Completed with a painted or galvanized framework with a net chamber enclosed and a feed bunker on it allowing automatic feed supply and farming process supervision. To place the cage vertically, it is equipped with a special system providing its surfacing, submerging and positioning at a depth of 4-40 meter. Horizontal positioning of the cage is provided by the system of anchorage including anchor ties and anchors. Lightness and tracery of the cage are in full accordance with the sea landscape. The cage structure is produced to the "Rules for Building and Classing Underwater Vehicles, Systems, and Hyperbaric Facilities" and passes control assembling and testing at the manufacturing plant. It will have the certificate of the official "Maritime Register of Shipping". The steelwork is marked and packed as packages or in boxes witch can be transported in a standard 40-feet container.
The basic material of the (polygon) framework consists of rod welded tubular low-carbon (grade A) steel elements, connected with each other by flange-bolts. The three-dimensional framework forming a regular nonahedron in plan, with three slanting trusses, running from the vertical columns to the geometric center, closing at the feeder casing. The upper contour is completed with service platforms, passage walkways (500 mm wide) with railings (1.000 mm high) and removable hand-ropes, also to the feed bunker. The walkways and brackets are made of pipes with 120 mm in diameter. The vertical columns (720 mm in diameter, 2.250 mm long) house permanently buoyancy compartments, balancing tanks, and compensation tanks of residual buoyancy resulting from discharge of changing loads. Also sensors that measure depth of submergence, water temperature and underwater acoustic are housed there. The 5.980 mm long horizontal members of the bottom contour are made of pipes with 478 mm in diameter and house the main ballast tanks and compressed air cylinders, 6 of witch are ballast compartments and 3 are compressed air cylinders. Three mooring walls with wooden guard rails are provided for service boat mooring. To provide for safety of work of the attending personnel, the cage is equipped with removable single-row life-lines.
LayoutThe shape of the whole structure and all separate sections are adjusted so that the cage experiences minimum rolls and trims at waves and current. The experience of the underwater system operation has proved that the operation in the water column is the most effective structural measure to protects structures from corrosion. Hot galvanized coating provides the structure service life of more than 20 years. This coating is reliable, practically excluding restoration and repair. The system of automatic underwater feed distribution is intended for storage and measured distribution of feed for an autonomous operation of 7-30 days and located at the geometric center of the cage. The system consists of a water tight bunker of 3.000 liter (2 tons feed in average) of cylinder-conical shape (1.412 mm in diameter and 2.890 mm in height) and an automatically feed distributor (with a microprocessor) with a volumetric type dosage of 5 liter each. Compressed air is supplied to the pneumatic device by pipelines from compressed air cylinders, witch are replenished from a service boat, equipped with a compressor. To prevent water penetration into the feeder, its upper part is equipped with a water tight hatch with a rack-and-pinion lock. Inside the feeder the upper part houses solenoid valves, system controller and (24 Volt, 125 Ah) batteries. The system is made of corrosion-proof steel (6-8 mm thickness) and non-ferrous metals.
To submerge and surface the cage it is equipped with ballast compartments. The main ballast tanks are filled by gravity via drain holes equipped with ventilating valves with a remote control pneumatic drive. The balancing tanks are filled via kingston valve. The water from ballast compartments is replaced by compressed air (5-10 kg/cm3), supplied from the service boat compressor (min. 150 l/min). Air to the actuators is supplied through the pipelines made of corrosion-proof steel and rubberized hoses. The process of submerging and surfacing is supervised by the depth sensor, its display being located at the service boat or via water acoustic communication channel from the shore.
The signal buoy consists of cylinders of variable sections, providing a platform for deployment and protection of the control and monitoring complex of the cage. The size and weight characteristics are adjusted to provide survivability in the regime of extreme weather conditions. It can operate afloat at wave (force 8-9) and respective wind speed. It also can freeze in ice (up to 50 cm) to stay for winter. Flexible pipelines and electric cables coming from the signal buoy to the cage and supplying compresses air and providing power supply. Additionally the buoy includes the antenna for an underwater acoustic control and monitoring system with an operation range of 10 km. Safety is provided by flashing beacons and corner reflectors, also from the feed bunker.
To install the cage at the water area (in a depth of up to 50 m), it is equipped with a special system of anchorage, consisting of anchor ties (i.e. a chain with a variable running mass) and 3 anchors (weighing 3-10 t), providing reliable functioning of the system under weather conditions given. The anchors are not included in the delivery, but are made on site (by the customer according to the drawings given). The anchorage system is designed for each particular site depending on hydro-meteorological conditions and depth of an installation site.
The net chamber with a volume of 1.000 to 2.000 m3 is built from kapron or nylon net. The net chamber is placed within the steel structure at special guy-ropes, running up and down from the platform. The guy ropes are fastened to the feed bunker and the net chamber. To provide for harvesting of fish, the net chamber is equipped with a device, consisting of a rope system and portable hand operated winch, raising the bottom edge to the surface. To remove wastes from the net chamber it is equipped with a special tray device witch is lifted to the surface by the help of winches.
It is possible to position the cage system in a depth range in the water column of 4-40 meter. Floated the system withstands waves (with personnel to force 3) without personnel to force 6 and waves up to 6 meter. Submerged it is resistant to force 9 and respective wind speeds and waves up to 8-9 meter.
The axial diameter is 20,12 meter and the light displacement is 16,2 tons. Total height (including 2.000 m3 net chamber) is 12,1 meter, the minimum draught (at launching) is 0,8 meter and the maximum draught (including 2.000 m3 net chamber) is 8,6 meter.


Illuminated submerged netcagesILLUMINATED NETCAGES for the fingerling production with natural zooplankton

20 years' experience in the field of global plankton research and fingerling production with natural plankton and years of tests under different environmental conditions in marine and fresh water, are the basis of the new "UWG- Solar cage system". The production method is based on plankton feeding in the natural environment like: lagoons, bays, fjords, lakes and large ponds, by means of attracting the organisms using a lamp located in the center of fine meshed submerged nets. Mainly Copepods and Cladoceres - but also a variety of other zooplankton organisms are photo sensitive and steadily swarm into the cages towards the light source.
The 2x2x2 m net cages (8 m3) are manufactured from highly resistant mono-filament polyester fabric (with mesh sizes 0,3 to 2,0 mm), is fitted with a zipper for easy access and a conduit for the electric cable. The net cage is stretched onto a strong stainless steel or aluminum frame. An efficient Solar-Generator is supplied for remote site operation. An electrical transformer can be supplied in order to reduce voltage to safer levels for use with water. Depending on the zooplankton populations, the fish-stocking density (from the fry stage to fingerling size of 5 cm length) can come to 5.000 Ind./m3 and survival rates of more than 90 % have been achieved with various marine and freshwater fish species.
The operation and maintenance is limited to the functional control of the system, a periodic cleaning with a portable high pressure cleaner, in order to prevent clogging effects, caused by detritus, algae and faces, and the observations of the plankton development in the location.  The system is environmentally safe since no feeds or fertilizer are applied, the construction materials are inert, and the plankton consumption is minimal and does not affect the natural stocks.


Underwater lightUNDERWATER LAMPS to delay maturity and increase growth

Underwater lights are used successfully in both fresh- and seawater, either in the night to attract organisms (like in fishery or net pens), or during the winter (24 h/day) for the simulation of daylight to delay maturation and increase growth in several fish species (like: Salmon or Cod etc.). Mainly green light (around 500 nm) is used to attract squid, shrimp and fish, blue light (around 450 nm) to attract zooplankton (Copepods, Phyllopods) and to simulate daylight, and white light (around 575 nm) is used for all or general purposes. Halogen-lamps are only available with white light (light intensity approx. 80 Lumen/Watt), LED-lamps are available with white  (approx. 100 Lumen/Watt), green (approx. 80 Lumen/Watt) or blue light (approx. 40 Lumen/Watt), whereby blue light penetrates further in water but white light comes closest to the natural spectrum. This special submersible waterproof lamps are available in different power ratings (LED in 8-400 W and Halogen in 100-1000 W) with a fixed cable for a voltage of 220-240 V AC or 12-24 V DC. For the simulation of daylight, the recommended power in LED is about 1 Watt/m2 and in Halogen is about 3 Watt/m2 of the holding unit (tank or cage).


Dual head netwasher in useNET CLEANING SYSTEM with high pressure

This netcleaners maintain a flow of oxygenated water through the nets, that keeps them clean with minimal disturbance and no need to remove the fish from the pens. It's construction and design make the washers head working toward the net against its own high pressure water stream and can be used on all types of nets and cages. The netwasher loosen and pulverize, with its high pressure water stream, algae growth, food remains and other fouling, which in turn will drift away by the current. The single head disk is easily used, the dual head disk is for faster cleaning. The fuel driven pressure pump with high output drives the head of the net-washer disk or can be used for pressure washing. It can be operated by one man from the boat or walkway/collar or underwater by a diver. Alternatively a hydraulic power pack for workboats is available, which is permanently installed with all the advantages of hydraulic drive, useful for pressure washing on boat and cages.

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This special polymer (PVC) coated polyester (PET) net is very strong and stable, but also flexible. The nets are 100 % stronger than conventional nylon nets, are highly UV-resistant, suitable for seawater and need no antifouling. They need about 90 % less maintenance and have fewer escapes than nylon nets. The live-time of this nets with continuous use in fresh water is up to 30 years. The material is available on coils with a width of 3,6 m with a mesh size of 5 mm, and 5,0 m wide with a mesh size of 20 and 40 mm. With a weight of 450-780 g/m2 the cages need no lead sinkers. We deliver finished cages or also the material on coils.

Nets with the following specifications* are available as standard:





Square mesh size (open area)

40 mm

20 mm

5 mm


490 g

780 g

450 g

Tensile strength (ISO 53857) Warp/Weft

45 kN/m

90 kN/m

40 kN/m

Expansion force (ISO 10319)

20 % 10 % 15 %

*Specification data on average (+/- 10 %).

Polyester Nets (PVC-covered) MS 5-40 mm


NYLON NET MATERIAL for cages and fishery

Nylon Nets (knotted or knottless) MS 4-30 mmThe production is based on a complete process, from the raw material, passing the different manufacturing phases like: matching, weaving, cutting and packing. Our aim is to assure a quality product to the customer. Woven in high resistant nylon, all our nets are machine sewed with double rows of stitching. UV-antifouling protection or coloration, on request. The finished nets are delivered in any shape or size with a mesh size of 4, 6, 8, 10, 12, 15, 18, 20, 25 or 30 mm, or only the net material itself.

Seine Nets in two designs:
Seine net with bag - consisting of two wings and respective bag in between, for the catch of fishes in lakes, rivers and ponds etc.
Seine net without bag - consisting of a well vault single wall, for the harvest of fishes in ponds, raceways and tanks etc.
Both nets are complete ready to use mounted in strong ropes, with foam floats and lead sinkers.

Gill nets in two versions:
Single or triple sheet gillnets with a mesh size of 6-150 mm, in various heights and lengths.
Both gillnets are available loose or mounted ready to use with lead and float line.

Trap Nets in two outfits:
Fish traps - with one troth and three galvanized iron rings, as well as two wing nets each 1,5 m long.
Fish bags - with two troths and five iron or plastic rings, as well as two wing nets each 2 m long or a 3 m long guide net.
Both nets are complete ready to use. Longer wing or guide nets with floats and sinkers are possible.

Cast Nets in two arts:
Traditional art - the lower line with harvest bags, which catch the fish.
Yugoslavian art - the lower border will be formed to bags by ropes during lifting.
Both nets are complete ready to use and have a circumference of about 7 m, a height of approx. 1,7 m and a mesh size of 11 mm as standard.

Scoop Nets in two forms:
D- or O-formed strong, corrosion free scoop frames (wide 40-70 cm) with protection and preparation for handle.
Both nets are complete ready to use mounted with net bag (mesh size 4-20 mm), and a handle (length 1,3-1,7 m) from hard-wood as accessories.

We deliver also other nets in various sizes.


PRECISION CLOTHS for aquaculture and hydrobiology

Precision woven screening fabric is a highly specialized monofilament fabric, characterized by precisely defined and controlled, consistent and repeatable material properties s.a.: mesh size, thickness, tensile strength, dimensional stability, cleanliness etc.). This fabric program includes precision sieves of different material strengths and offers a narrow mesh grading between 20-2000 micrometer and therefore fulfills all requirements of today's aquaculture and hydrological needs. Appropriate sieve fabrics are offered per running meter and as standard or customized products, such as filter-, dip-, hatching-, cage- and plankton-nets.
In Austria a catch of zooplankton for the production of fry and fingerlings is commonly practiced since more than 50 years. During the last years several important optimizations are archived allowing a better net construction and easy catching. With appropriate designed plankton nets, harvests of several tons per day can be achieved. Thanks' to this Austrian development of special sieve-net-systems, it is possible to grad the plankton in 3 different size classes during the catch. The result is the correct plankton size for all development stages from fish larvae to fry and fingerling. An expensive and complicated indoor-production of prey organisms (such as: Algae, Rotatoria, Artemia, Daphnia etc.) can be replaced.

Plankton nets in use Copepodes under 500 micrometer cloth



Shades and nets are made from UV-stable polyethylene material with a shading density of 30-85 % to protect fish and ponds from light and birds. The sheets which let water (from rain) to drain off, are available on coils from 1,5 and 3,0 m width and can be manufactured wider with extra strong hem and eyes. For pricing always the width of the coil is calculated.

Shadding sheeds and protection nets (shadding value approx.: 85, 75, 65, 50, 45, 30 %)

We also deliver bird protection nets with a mesh size of 15 - 150 mm.


TRAPS made from plastic

This easy to handle and maintenance free plastic traps have been tested in practice and are suitable for both professional and sport fisherman. Features such as a new shape and correct coloring are the result of fishing expertise's. A favorable price/performance rate ensures highest economy in use. Of course the traps are saltwater and corrosion resistant and also resistant to crabs and other pests. This traps (with exchangeable components) have a wide inlet opening and an integrated bait basket in the closed end cap. The traps are specially suitable for catching eels, but can also be used for other fish species as well as crayfish. This traps are delivered complete with sinker weight for submerging, which guarantee that the trap is always positioned with the upper closed side on top, which in turn created a protection shelter for the animals.

Eel-trap 2-throatsCrayfish-trap 2-throats

The following versions are available:

Version Throats Length Weight
Eel-trap 2 1.5 m 4.2 kg
Eel-trap 1 1.0 m 2.4 kg
Crayfish-trap 2 0.6 m 1.0 kg

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ALUMINIUM BOATS for fisheries and watersports

This multi-purpose boats are made of 1-3 mm thick seawater resistant aluminum, welded with modern technologies (WIG-Argon und Plus-ARC) and need no coating or antifouling. The integrated floats secure this boats are unsinkable. As accessories the following is available: Stand with steering, Build-in-tank, Electro-outfitings, Swimming ladder, Reeling and Persenning etc.
The smaller recreational boats Type A (from AlMg3) are made in multi parts and can be divided for transport (to 125x135x55 cm) or also extended on demand by additional body modules. They are verified by Lloyd's Register in Hamburg and have the EU-conformity certificate (CE-Module-D).
The larger working boats Type C (from AlMg4,5Mn) are made in single parts. They are verified by Lloyd's Register in Hamburg and have the EU-conformity certificate (CE-Module-C).

Typ 230A - 350A - 480A Typ 610C

The following types are available as standard:

Type 230A 350A 480A 470C 610C 750C
Length: 230 cm 350 cm 480 cm 470 cm 610 cm 750 cm
Width: 135 cm 135 cm 135 cm 180 cm 180 cm 180 cm
Height:   48 cm   48 cm   48 cm   75 cm 75 cm 75 cm
Weight: 45 kg 60 kg 80 kg 250 kg 300 kg 400 kg
Loading: 200 kg 250 kg 350 kg 450 kg 600 kg 800 kg
Parts: 2 3 4 1 1 1
Motor (max): 6 PS 10 PS 15 PS 40 PS 60 PS 80 PS


INFLATABLE BOATS for fishery and recreation

This well designed and large dimensioned inflatable boats are build from a very strong (blue-grey) plastic material, according to requirements of todays customer preferences and use. The good quality workmanship and materials guarantee security and longlifety, also in seawater. The large diameter of the hose, the reinforced heck plates and the keel forms, allow the boats even with minimal motorization and low speed, good gliding, high floating capacity and enormous stability. Security and safety is provided by the bars with broad profile on the sides and keel, by the valves situated inside, as well as by the security and holding ropes on top. The sturdy handles situated outside and the self lending valve inside allow easy handling and working.

The models S of the "Sport Serial" (excl. 200 S) are fitted with a wooden floor with aluminum frame (aluminum floor on request), and strong switchable rowing supports with stackable paddles from aluminum. A wooden bank with fixing possibilities, holders for the persenning, bag and reparatory sets are standard outfits.
The models P of the "Professional Serial" are fitted with a fixed bottom hull made from grassfire reinforced polyester with deep V-formed keel, an integrated driver stand with reeling and window, as well as single seat in the middle and double bank in the back. A self-lenting anchor box and closable storing boxes are standard outfits.
Packing bags, heck wheels, bathing ladders, seat banks (also inflatable) etc., are available as accessories.

Modell S Modell P

The following models are available as standard:

Model Length Wide Weight Hose Ø Chambers Motorization Capacity
200 S 200 cm 134 cm 24 kg 35 cm 2 max.   3 HP 260 kg
230 S 230 cm 134 cm 29 kg 35 cm 3 max.   4 HP 290 kg
305 S 305 cm 149 cm 45 kg 40 cm 4 max. 10 HP 470 kg
335 S 335 cm 149 cm 55 kg 43 cm 4 max. 15 HP 560 kg
380 S 380 cm 179 cm 69 kg 45 cm 4 max. 25 HP 670 kg
430 S 430 cm 192 cm 79 kg 50 cm 4 max. 40 HP 830 kg
460 P 452 cm 201 cm 220 kg 47 cm 5 max. 60 HP 630 kg
520 P 514 cm 230 cm 280 kg 52 cm 5 max. 60 HP 720 kg


ELECTRO MOTORS for boats and pontoons

Electro motors (shaft, screw and flange models)For boats, an electro motor is practicable for up to 9 m total hull lengths. Electric motors have, compared with petrol motors, different turning moments, which allow to use electric motors with relative low powers. Longtime experiments have proven, that the required power relation (electro to petrol motor) can be 1:2.0 to 2.5, if the petrol motor was not over motorized for the boat and the use. All models have a compensated row motor, which coiling compensation optimizes the energy usage and increase the output of the motor, specially at higher turns. The casings as well as all supports are made from marine aluminum (GalSi5Mg to DIN 1725, pp. 2), which is corrosions and seawater proof. All other materials incl. all screws are made from stainless steel. The ball bearings are made for long operation and live and the seals of the bearing are made form seal rings. All parts are covered by plastic or special paintings for additional protection. Motor and motor casings are also painted with antifouling. All parts are built with high precision and each motor will be tested to electric performance.

The outboard-shaft models have a weight of 19-21 kg and are delivered with integrated cable, switch and fuse. They are ready to use and just have to be mounted on the heck and connected with the cables to the battery. Available in 3 power sizes (500, 800 or 1.400 Watt) with 4 steps (2 front and 2 back) and with different shaft lengths for various boat types.
The inboard-flange models have a weight of 15-35 kg and are delivered with complete cables, switch and fuse. They must be installed on the boat and are fitted with a pin, where linking ropes can be fixed. Available in 4 power sizes (800, 1.400, 2.000 or 3.000 Watt) with 4-6 steps (font and back).

A foldable propeller, which brings the wings into a position so that they doe not turn if the motor is not used, is available as accessories. Additionally, special batteries for long time use with high cycle stability, battery loaders, and (from 36 V on) a steeples motor regulation is available.

We also deliver all other nets and traps for commercial fishery!

Recirculation - Incubation - Feeding - Aeration - Monitoring - Processing - Equipment

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