SUBMERSIBLE WAVEPROOF NETCAGES for offshore fish farming
This "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 demage 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 wich 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 threedimensional framework forming a regular nonahedron in plan, with three slanting
trusses, running from the vertival columns to the geometric centre, 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 wich 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.
The shape of the whole structure and all seperate 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 porotects 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, wich 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
selenoid 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. Additionaly 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 preferably built from kapron or
nylon net but could be changed to our polymere covered polyester net (mesh size 12, 20, 25
or 40 mm) too. 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 wich 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. Afloated the system withstands waves (with personel 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.
Traditional rectangulare cage-systems of any size, we produce based on our ponton system
ILLUMINATED SUBMERGED 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 faeces, 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 lights are used sucessfully (24 h/day) to delay
maturation and increase growth in several fish species (like: Salmon, Trout and Cod etc.).
in both sea- and landbased farms. This special submersible waterproof (IP 68) lights
are made according to IEC and CE standards and are DEMKO and NEMKO approved. The socket of
the special lamps is base E40 and the glass lens has a thickness of 5 mm. They have
been tested at independant laboratories and light distribution files are used for
calculating distribution in cages and tanks. The light intensity is 70-90 lm/W, the light
current is 80-90000 lm and the colour temperature 4000-5000 K. They have dimensions
(Length x Diameter) of 565 x 130 mm, a weight of 12,5 kg and are delivered with 20-40 m
fixed marine cable (3 x 2,5 mm²), and are available in two power ratings (400 or 1000 W,
3,2 or 5,5 A) for a voltage of 230 V/50 Hz.
POLYMER COATED POLYESTER NETS for cages
This special polymere coated polyester 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 less maintainance and have fewer escapes than nylon nets. Nets having been in use for more than 20 years still look like new and save a lot of total operation costs! The material is available on coils with a width of 3,6-3,8 m with a mesh size of 5 and 12 mm, and 5 m wide with a mesh size of 20 and 40 mm. With a weight of 450 to 780 g/m2 the cages need no lead sinkers. We deliver finished cages or also the material on coils.
Specifications
Typ |
45/45-40 |
90/90-20 |
40/40-10 |
40/40-5 |
Square mesh size (open area) |
40 mm |
20 mm |
12 mm |
5 mm |
Weight/m2 |
490 g |
780 g |
500 g |
450 g |
Tensile strength (DIN 53857) Warp/Weft |
45 kN/m |
90 kN/m |
40 kN/m |
40 kN/m |
Expansion force |
20 % |
10 % |
15 % |
15 % |
All data on average (+/- 10 %).
NYLON NET MATERIAL for cages and fishery
The 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 sewen with double rows of stitching. UV-antifouling protection or colouration, 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 - consiting 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.
Trap Nets in two outfits:
Fish traps - with one trouth and three galvanized iron rings, as well as two wing nets
each 1,5 m long.
Fish bags - with two trouths and five iron or plastic rings, as well as two wing nets each
2,0 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 scoope 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 m) from hard-wood as accessoire.
We deliver also gill-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, tenisle
strenght, 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 fulfils all requirements of
today's aquaculture and hydrological needs. Appropriate sieve fabrics are offered per
running meter and as standard or customised products, such as filter-, dip-, hatching-,
cage- and plancton-nets.
In Austria a catch of zooplancton for the production of fry and fingerlings is commonly
practisized since more than 50 years. During the last years several important
optimisations are archived allowing a better net construction and easy catching. With
appropriate designed plancton nets, harvests of several tons per day can be achived.
Thank's to this Austrian development of special sieve-net-systems, it is possible to grad
the plancton in 3 different size classes during the catch. The result is the correct
plancton 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.
SHADING SHEETS AND PROTECTION NETS made of polyethylene
Shades and nets are made from UV-stable polyethylene material with a shadding 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 with extra strong hem and eyes. For pricing allways the width of the coil is calculated.
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 colouring are the result of fishing expertises. 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 exchangable components) have an inlet opening of approx. 42 cm 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 plastic covered iron spits (12 mm Ø) for submerging, which guarantee that the trap is allways positioned with the upper closed side on top, which in turn created a protection shelter for the animals.
The following versions are available:
Eel-trap: 1-throats, approx. 1,0 m long, weight 2.4 kg
Eel-trap: 2-throats, approx. 1,4 m long, weight 4.2 kg
Crayfish-trap: 2-throats, approx. 0,6 m long, weight 1.0 kg
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 waterstream, 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 netwasher 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.
Quality is our motto ... and your profit!
