Aquaculture Technology

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Recirculation - Holding - Filtration - Disinfection

Recirculation Systems

RECIRCULATION SYSTEMS for nursing and holding

The "Aqua-Circle" modules for nursery and holding are available for a yearly production-capacity of 1-2 t (125-250 kg standing crop) and consists of 2 square and one filter tanks with the needed technique and equipment. The water from the fish tanks are cleaned through a particle filter to remove suspended solids prior to bio-filtration. The bacterial settlement for nitrification will develop on the packages of the reactor, mud will be removed through the current. Our bio-reactors have the gigantic settlement-area of over 900 m2 per cubic meter filter material and therefore we need only very small filter units. Through the introduction of fine air bubbles through a special aeration- and lift construction our systems work without pumps and therefore require less energy thereby reducing costs. Through compact construction, this system can be installed any time and anywhere without rebuilding or extension expenses. Aquaponic kits or hydroponic sets are available optionally.

Recirculation System

RECIRCULATION SYSTEMS for the intensive production

The "Aqua-Source" modules for production are available for a yearly production-capacity of min. 25 t/year (standing crop 10 t) onward and allow our customers to get familiar with the technique and topic without high risks. The water from the fish tanks is cleaned through a drum filter to remove suspended solids prior to bio-filtration, where the nitrification process and the aeration takes place. From there the water is pumped to the fish tanks, witch could be adapted to customer wishes in form, size and number. The use of UV- or ozone is possible too. This system is available for all freshwater (like Catfish, Sturgeon, Salmon) and seawater species (like: Seabass, Grouper, Kingfish). The required space (hall) is min. 10 m2/t of yearly production. Beside consulting and planning we offer also training and service as well as the seed (fingerlings) etc.

Example - Checklist

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Holding Systems

HOLDING AQUARIA for fish and crustacea

Holding aquariumAn aquarium should be seen as a complex grouping of elements functioning synergistically to maintain constancy of environmental characteristics, countering any variation whatsoever and simulating as far as possible the whole biological cycle that is present in nature and indispensable to the live of the aquatic animals. This professional range of aquariums are designed for holding of live crustaceans or fishes at a working temperature of 10-30 °C and consists of double glass walls in which the two layers of glass are separated by a dry air gap. The aquaria are delivered as complete assembled units with ALU-frame and PVC-panels (70 cm high, color: black) with cover and lights (IP67), external mechanical/biological filter, circulation pump and chiller with thermostat, as well as cable and plough. Energy consumption 550-1100 W, depending on model and temperatures. The two larger systems are also available with divided double-aquaria. Aquaria with panels in reinforced polyester, solid wood or or stainless steel, on request. Larger stacked holding aquaria units, on request. Single wall glass aquaria (200-600 l volume) with stainless steel frame, on request.

The following models are available as standard:

Model AT-70 AT-100 AT-150 AT-200
Dimensions (LxDxH) 70x50x135 cm 100x50x140 cm 150x60x140 cm 200x60x140 cm
Volume approx. 200 l 300 l 500 l 700 l
Holding capacity 5-10 kg 10-15 kg 15-25 kg 25-35 kg


HOLDING TANKS for fishes, crustaceans or mollusks

PE-holding tankThis isolated (PE) polyethylene tanks in blue color  and cover are especially suitable for the holding of live fishes, crustaceans or mollusca (like: crabs or oysters etc.) in fish or seafood restaurants, mongers, wholesalers etc. The compact units are delivered complete with integrated biological filter (calcareous seaweed) with pH-buffer effect below, and mechanical pre-filter, titanium-chiller (R134) with digital display and thermostat, recirculation system with pump, injectors, valves and PVC-pipes behind or on the side of the units. They are build for fresh and seawater, an electric connection of 230 V/50 Hz and a working temperature of 0-30 degree C. The electric consumption is about 0,5-1,0 kw/h, depending on model and temperatures. For mollusks, an UV-C lamp can optionally be integrated in the cover. The 3 larger tanks (dimensions ±2 %) with equipment on the side (+ 60-70 cm long) are instead the cover, optionally available with a 50 cm high double-walled glass-aquaria (approx. 200 to 400 l) incl. protein skimmer (+ 10-12 cm high). Larger stacked holding tank units, on request.

The following models are available as standard:

Model IT-300 IT-500 IT-700 IT-1000
Dimensions (LxWxH) 94x94x87 cm 112x112x89 cm 148x117x87 cm 199x117x89 cm
Volume approx. 300 l 500 l 700 l 1000 l
Holding capacity 20-40 kg 30-60 kg 50-100 kg 75-150 kg


HOLDING SYSTEMS for crustaceans and mollusks

Holding tank with viewing windowsThis proven (GRP) glassfibre reinforced polyester tanks (isolated with polyurethane) are specially suitable for the holding of crustacea and mollusca (like: lobsters and clams etc.). The systems are delivered complete with integrated mechanical-biological filter (Lithothamnium calcareum) with pH-buffer effect and pre-filter, titanium-chiller (R134) with digital display and thermostat, recirculation system with pump, injectors, valves and PVC-pipes. An UV-C or an ozone system and a heater are possible optionally. They are build for an electric connection of 230 or 380 V/50 Hz and a working temperature of 5-25 degree C. The electric consumption is about 1-2 kw/h, depending on model and temperatures. The two smaller systems are optionally available with a 50 cm high holding aquaria (approx. 300 resp. 500 l) on top and the smallest system also with viewing windows in the tank sides. Larger stacked holding system units, on request.

The following models are available as standard:

Model A-1002 A-2004 A-3006
Outside dimensions cm 220x120x102 320x120x102 420x120x102
Inside dimensions cm 200x100x34 300x100x34 400x100x34
Volume approx. l 800-1100 1400-1800 2000-2500
Holding capacity kg 90-180 135-270 180-360
Electric connection V/Hz 230/50 380/50 380/50
Weight kg 500 900 1300


POLYESTER TANKS in all forms, sizes and colors

This tanks have a long proven history (30 years) and are manufactured of (GRP) glassfibre reinforced polyester layers. The conical forms, the funnel shaped outlets and the absolutely smooth inside finish ensure the system is practically self cleaning. Therefore it is possible to hold sensitive bottom fish or fish larvae too. The whole pools and especially the edging very strong, allowing attachment of automatic feeders or other equipment. The tanks are delivered in different shapes, sizes and colors. Optional laminated feet make it possible to place the pools safe on any bottom and ensure easy lightweight handling or transportation. The swing or telescopic outlets are made from PVC-pipe (DN 50-150 mm) with water level regulation, which is fixed under the bottom and leaded at the tank side. Bottom or stand sieves (2-5 mm) are available as accessories. More details in the brochure at the following link.

Circular basins in all sizes and forms! Rectangulare tanks in all sizes and forms!



Circular pool with linerThis pools (2.0-8.0 m diameter and 0.9-1.5 m high) can be placed in or on the ground and consists of a 0.4-0.7 mm strong galvanized iron wall which is painted inside and plastic covered outside. The lower and upper bottom- and hand-rails are made of strong plastic to ensure a long self-life. Inside the pools are lined with a 0.6-0.8 mm strong PVC liner with exact fitting in blue color (other colors like black or gray, on request). If preferred we deliver also just the robust and soft PVC pond liner in a thickness of 0.5 to 1.5 mm in the colors black or green, on coils with a wide of  2-8 m and a length of 15-50 m, or as finished liners in any size.

The following sizes are available as standard:

Volume Diameter Height
  2600 l 2.00 m 0.90 m
  6000 l 3.00 m 0.90 m
  8000 l 3.00 m 1.20 m
11000 l 3.50 m 1.20 m
15000 l 4.15 m 1.20 m
18000 l 4.50 m 1.20 m
21000 l 4.50 m 1.35 m
28000 l 5.00 m 1.50 m
40000 l 6.00 m 1.50 m
58000 l 7.00 m 1.50 m
75000 l 8.00 m 1.50 m

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Filtration Systems

PRESSURE FILTERS with cleaning technic

Pressure Filter UV-CThis compact pressure filters with integrated UV-C lamp (220-240 V/50-60 Hz) with a service life of up to 9.000 hours, are complete filter systems with ecological threefold operation technic (mechanical/biological/optical), to solve all filter problems in garden ponds or aquarium tanks. An integrated user friendly backwash system allows an easy maintenance without opening of the filter. The water leaving the filter has the same pressure as the entering water (max. 0,2 bar) and therefore may can also used for waterfalls or injectors and therefore provides for a better oxygenation. The filters can stand free or set into the ground, below or above the water outlet and used for fresh- or saltwater. The filters are available in three sizes with a volume of 25-35 l and 20-40 mm hose connections as well as 10 m cable, for a recommended flow of approx. 2,0-4,5 m3/h and a tank or pond size of max. 2-6 resp. 4-12 m3 (with resp. without fish stock).

Model PA-4 PA-8 PA-12
Flow m3/h 2,0 3,0 4,5
UV-C Watt 9 11 18
Dimensions (ØxH) cm 37x53 37x61 42x61
Weight kg 7,2 8,1 9,3


Sandfilter with pumpSAND FILTERS for high comfort

This sand filters are made of glassfibre reinforced polypropylene or polyester and available in various sizes, heights and types (diameter 0.4-1.8 m, height 0.6-2.2 m). The filter units with high performance are available as single systems with or without distribution cross and outlet valve, manometer (with automatic and/or manual air removement) or also complete with pipes and ready for connection (230 Volt/50 Hz) with 6-way backwash valve, self-priming 8-80 m3/h filter pump (with large debits collector in plastic) mounted on a noise reducing plate made of plastic. The special filter sand (0.4-6.0 mm) is available as accessories. An automatic backwash system is available for all models and guarantees high comfort and safety.


CHAMBER FILTERS with swirl separator

This new compact filters are used specially for holding units and garden ponds and are very effective for the fine and raw filtration. The system can be operated by gravity or pumps and can be placed into the ground or stands free. A long inlet opening secures that the water in the vortex rotates slowly, so that the larger waste particles are trapped in the center of the bottom. The build-in flow channels force the water to flow trough the filter media (i.e.: Filter brushes, Japan matts, Sinter glass, Aqua rock, Bio balls, Poly foam etc.). The waste particles concentrate at each cone, where they can be removed regularly by opening of a gate valve. The models are made from grass-fiber reinforced polyester (GRP) and are delivered with cover and outlet pipes. They are available with or without filter material.

The following Center-Vortex models are available:

Type/Model C20 C30 C50 C80 C100
Size L + W cm 85 107 140 165 193
Height cm 65 75 80 100 100
Vortex Ø cm 45 50 75 95 110
In/Outlet mm 110 110 110 160 160
Flow approx. m3/h 4 6 9 12 16
Pond volume max. 20 30 50 80 100

On request also Row-Vortex filters with 3-5 filter chambers are available.


DRUMM FILTERS with high capacity

We offer a complete product range of drum-filters with a diameter of 0,4-2,0 m and 1-40 filter plates with mesh screens from 20-100 micro meter (µm) for flow capacities of up to 900 l/s. This drumfilters for the mechanical cleaning of low to medium loaded aquaculture or industry waste waters are made from stainless steel and are available complete with or without installation tank. The operating system of this special drum filter is pretty simple but very effective. The water to be filtered is directed by gravity into a rotating drum. The outer surface of the drum is constructed with a number of exchangeable frames covered with fine mesh screens. Particles larger than the perforations, unable to pass through the mesh are retained in the drum as the water pass through the filter from inside to outside, without pressure. The slowly rotating drum lifts them outside of the water, where a cleaning pump cleans the screen by special nozzles and discharges the solids by gravity through a discharge ramp. Optionally, a control box and an adjustable timer or automatic water level sensor can be supplied, which activates the drum rotation and cleaning pump only if the filter screen is clogged and the water level in the filter rises. This allows to keep energy and water consumption low. More details in the brochure at the following link.

Drum filter without installation tankDrum filter with installation tank


PROTEIN SKIMMERS for aquaculture and aquaria

Protein SkimmerThis protein scimmers or foam fractionators have a good dimensioned volume of the reaction- and foam tube. A special injection unit generates a vacuum, where air is succeed in and distributed in fine bubbles. In seawater the single bubbles have a volume of 0,065 mm3, a surface of 0,785 mm2 and a diameter of 0,5 mm. Each liter air generates therefore a total surface of 12 m2. A rotating (patented) nozzle system cleans the foam tube and the foam collector. Over a valve (optional automatic) water cleans the nozzle systems. A regulating system allows to operate the skimmer also under extreme differing situations of water column. Each skimmer, made from acryl and/or polypropylene (on request also from polyethylene), could be also used as ozone reactor. The optimal retention time is about 2 min., if the flow rate is increased the retention time decrease.

The following types are available as standard:

Type/Diameter mm 300 500 700 850 1000 1200 1500 1750 2000 2500
Volume m3 0,10 0,27 0,63 1,40 1,90 2,70 4,30 5,80 7,50 11,70
Height m 2,0 2,0 2,5 3,5 3,5 3,5 3,5 3,5 3,5 3,5
Air suction m3/h 1,5 5,0 9,0 13,6 18,0 27,0 42,0 60,0 85,0 120,0
Power kw 0,45 0,75 0,85 1,10 1,50 2,70 3,80 4,30 4,90 7,60
Retention time min 2 2 2 2 2 2 2 2 2 2
Flow rate m3/h 3 8 19 40 56 81 125 160 226 350

We deliver also ozone generators with a capacity of 1-1000 g/h.


BIOFILTER MEDIA with large settlement area

Biofilter MaterialFor Recirculating Aquaculture Systems (RAS) as well as aquaria and ponds or for the biological cleaning of waste waters after fish farms or culture ponds we supply the carrier or settling material for the biofilter which can be used in fixed or moving bead filters. The filter media are made from HD-PE (density 0,94-0,96 g/cm3) and is available of recycled raw material (black) or virgin raw material (white). They have a large settlement area for bacteria and allow a good biological cleaning from ammonia to nitrate (nitrification) as well as from nitrate to nitrogen (denitrification). The nitrification rate is approx. 0.5 g NH4-N/m2 in moving bead or flow filters (in fresh water at a water temperature of over 20 °C). In fixed bead or sprinkling filters, with a reduced cleaning capacity respective with more filter material of 20-30 % must be calculated. In seawater, as well as at water temperatures under 15 °C, with a reduced cleaning capacity respectively with more filter material of 40-60 % must be calculated. Other random media (like: chips/flakes/saddles) with up to 5,000 m2/m3, on request.

The following types are available as standard:

Material Polyethylene (cylindrical-round)
Type H65 H50 H38 H36 H25 H18 H17 H14 H12 H09
Form L-L L-L K-L X-L K-L X-W K-L K-L K-L R-L
m2/m3 total 100 150 200 300 400 500 600 750 850 850
m2/m3 protected 85 125 150 260 340 390 500 640 700 500
kg/m3 dry weight 40 50 55 80 90 110 125 150 150 160

Forms of biofilter media

The numbers mentioned in the types are the average dimensions of the products in mm (+/- 20 %).
Form (inside): K = Cross, X = Double cross, W = Wave, R = Ribs, L = Lamellae.

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Conditioning Systems

WATER DESINFECTION with ultraviolet light

UV-C Inline system (with control box)Ultraviolet light (UV) destroys microorganisms (like: virus, bacteria, fungus, parasites, algae, etc.) by changing their genetic information (DNA), but does not produce residual or hazardous by-products, nor does it affect the taste, odor or color characteristics of the treated water. It is light with very high energy levels and wavelength of 200-400 nanometer (nm). The most effective ultraviolet light for disinfection is UV-C (200-280 nm), specially with a wavelength of 254 nm.
The heart of the UV systems are high-performance lamps (low pressure technology) which provide a stable UV output through a wider temperature range (1-45 °C). This special lamps show higher degrees of effectiveness and stability than other conventional lamps. They also exhibit a high UV power output (up to three times more than competitive low pressure lamps) and long operating live (9,000 h), resulting in decreased overall costs. The efficient lamps have a high UV emission in the area of the effective wavelengths (254 nm), that makes it possible to destroy up to 99.99 % of all pathogens in water. To further increase efficiency, reliability and service lifetime, electronic power supplies (ballasts) for the lamps where developed. In addition, the new electronic ballast replaces several components required in conventional systems, reducing overall electrical cabinet size and heat transfer requirements.
By studying various reactor geometries with respect to the UV intensity distribution and hydraulic characteristics (0.5-6.0 bar), specific reactors types in stainless steel (AISI 316 or V4A) with 1-16 lamps where developed to provide effective disinfection while minimizing overall power requirements. Our systems have a modular design, which enables us to draw up solutions that are specified to our clients' needs in all areas of ultraviolet desinfection for up to several m3/h. This systems are characterized by their high disinfection performance, combined with compact construction and low energy consumption (220-240 V/50-60 Hz).

Type IS-40 IS-80 IS-120 IS-160 IS-240 IS-320 IS-780 IS-1040
Power (Hg) 40 W 80 W 120 W 160 W 240 W 320 W 780 W 1040 W
Lamps 1 pc. 2 pc. 3 pct. 4 pc. 6 pc. 8 pc. 12 pc. 16 pc.
Capacity* 2,4 m3/h 4,6 m3/h 7 m3/h 9 m3/h 15 m3/h 20 m3/h 50 m3/h 65 m3/h
Connections 1" 1,5" 2" 2" 3" 3" 4" 4"
Weight 5 kg 12 kg 13 kg 15 kg 32 kg 33 kg 45 kg 52 kg

*Capacity for drinking water with 98 % transparency at 400 J/m2, if the flow is doubled the dose is halved (enough for fishes)!


UV-C sumbmersible system (with holding plate)SUBMERSIBLE STERILIZERS for pipes, cannels and tanks

This UVC submersible emitters acts in order to sterilize water in pipes, canals, tanks and ponds etc. The diving emitters are made of stainless steel and accomplished as watertight. The (30 mm diameter, 25-155 cm long) tube of the diving lamp is sealed up (IP68) and screwed in the stainless steel (AISI 306 or V4A) case. The unit can be assembled or retrofitted with few movements. The diving emitter gets fixed by spring terminals on a stainless steel fixture (weight approx. 0,4-0,8 kg). The pre-switch electronics (230 V), properly attuned to the emitter, is included in the delivery and integrated in a switchboard (weight approx. 2 kg). Consequently an access or function control during the operation of the unit are warranted. The fuse protection by a GFCI ground fault circuit interrupter is necessary. The lifetime of high-power radiation (Quicksilver or Amalgam) is 16.000 h - quality you can rely on. The 3 m cable between the lamp and ballast can be extended on request on 6 or 9 m. Simply installation and maintenance in existing plants and pools. The watertight emitter can be mounted with a mounting plate on the wall or bottom or floating or hanging without any plate.

Type TS-200 TS-400 TS-600 TS-800 TS-1000 TS-1200
Power (Hg/Am.) 7 W 18/55 W 29 W 40/110 W 50 W 60 W
Total length 25 cm 45 cm 65 cm 85 cm 105 cm 125 cm
Total weight 0,4 kg 0,5 kg 0,6 kg 0,7 kg 0,7 kg 0,8 kg


ULTRASOUND DECVICE to destroy algae and protozoa

Ultrasound algae destroyerAlgae are problematic in many water areas and can create huge problems and high costs in industry, agriculture and other fields where water is used. Algae also make ponds and pools to ugly holes and can settle on boat hulls - where expensive antifouling coatings are necessary. This digital ultrasound devices (100-250 V/50-60 Hz AC or 12-24 V/1,5-2,0 A DC) send to the water (pond, pool or lake) special ultrasonic sound waves in periodic time scales trough the transducer in an angel of 180° on the front side. The wave length is depending on the type of the device and the mentioned distances are based on average values which can vary according to local circumstances, like water quality and water plants etc. In every algae the is a microscopic liquid bubble called vacuole. Our digital ultrasound device force that to swing which burst and finally kill the algae. But this is specific to different algae species. Single cell algae are killed after a treatment of 7-10 days, but filamentous algae need a longer treatment and die after 3-7 weeks. In which time the water will get clear depends also on the biological balance in the water. But also the quality and capacity of the eventually installed filter plays an important role. Additionally, with the ultrasound also the biological film (which builds up as sludge on the bottom or wall) in your water will be reduced and remove the base for many diseases pathogens like fungi or bacteria etc. The created ultrasound are not to hear for humans. If the device is in operation you may hear just a little ticking. But some other animals like dogs can hear it and may stay away from the device. Other is the whole with fishes, which some customers report prefer the ultrasound and stay nearby may because their skin is cleaned from parasites. Fishes feel not only better but also grow faster and are healthier with the ultrasound device.

The following types are available as standard: 

Type CS-10 CS-20 CS-50 CS-100
Consumption Watt 15 W 22 W 40 W 75 W
Treaded area max. 10x10 m 20x20 m 50x50 m 100x100 m
Cable length incl. 5 m 10 m 12 m 15 m
Weight approx. 2.2 kg 2.3 kg 3.5 kg 5.5 kg


HEATERS AND CHILLERS for aquaria and aquaculture

Climatisator (Chiller/Heater) Typ TK-3000This compact (CE-certified) flow-through heating and/or cooling systems can be used for various liquid media (also seawater or foods) and are very save and secure in operation through the missing direct contact to the media. An electronic control via a high precision thermostat and the continuous display of the temperature via a digital thermometer allows an easy and exact control of the temperature (0-35 degree C). The min. flow is 500 l/h up to type 2000 and 3000 l/h from type 3000 onward (max. 1 bar). An ecologic cooling gas (R290 resp. R134a or R410a) and a low power consumption are features of this transportable and easy to install systems. The standard connection is 230 Volt 50 Hz. Systems with integrated UV-C System, higher capacity or other voltages are possible on request.

The following types are available as standard:

Type/Capacity TK-500 TK-1000 TK-2000 TK-3000 TK-6000 TK-9000
Power Watt 260/310 300/310 400/310 700/800 900/1200 1100/1200
Connections mm 16/19 16/19 16/19 25/25 25/25 25/25
Weight kg 17 20 22 39 42 47
Dimensions (LxWxH) cm 31x31x42 31x31x46 31x31x50 60x40x57 60x40x57 60x40x57

*Capacity (0.5 W/l) in liter water volume at 5 °C temperature difference from ambient air to water (+/- 10 %).
Calculation of net energy: m3/h x °C x 1,16 = kwh.

 We plan and design also new hatchery, nursery or re-circulation farms!

Netcages - Incubation - Feeding - Aeration - Monitoring - Processing - Equipment

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