The Recirculation System
Assured predictability, better fish welfare
With a history of having delivered high-end recirculated systems for more than 15 species around the globe; AKVA group has proved its position as a highly qualified and reliable partner for the aquaculture industry. Combining the unique split loop concept with components of superior quality enables our experienced engineers to tailor each system to perfectly meet the biological requiremens of any specie both in fresh- and in saltwater. The use of a special microparticle filter provides crystal clear water without fine particles that could otherwise damage the gills of sensitive fish.
A unique concept suitable for most species
Species from A to Z...
Numerous other freshwater and saltwater species have already been cultured in recirculation systems.
Why choose AKVA group Recirculation Systems?
The revolutionary split-loop design of the system maintains a perfect rearing environment resulting in better growth and maximum profitability. AKVA group is the only supplier specializing in recirculation systems for both freshwater and full salinity saltwater with many successful commercial scale projects.
“Time Magazine awards tuna tank farming”
The break-through in farming of Southern Bluefin Tuna in the tanks of Clean Seas Ltd. in Australia has been awarded the world’s 2nd best invention in 2009 by TIME Magazine. For the first time, Southern Bluefin Tuna successfully spawned in a controlled environment in captivity. Clean Seas are now hatching and rearing fingerlings in the tanks, after which the fish are transferred to ocean farming cages where they are grown to a harvest weight of 50-80kg. Consequently, consumption of this tuna can now be done based on environmentally sustainable principles while at the same time reducing the pressure on wild stocks.
The Recirculation Process
A standard Recirculation System from AKVA group will treat the effluent water from the fish tanks as follows:
- Mechanical Filter - removing solid particles larger than 50 microns.
- UV Filter - controlling bacterial dynamics and ecto-parasites.
- CO2 Stripper - removing CO2, nitrogen and sulphide residues.
- Bio Filter - removing organic matter and ammonia products.
- Micro Particle Filter - removing suspended particles in the 2-50 micron range.
Balance and design
The production unit design is imperative for a successful rearing facility, and the solution depends highly on the behavioral pattern of the species. The tank system should be designed to optimize the water flow characteristics so that exact water exchange rates for the different species and fish sizes can be achieved. For any type of tank, the inclination of the bottom has no importance with regards to the self-cleaning effect, but it makes complete draining possible when the tank is emptied.
It is important to note that construction of large tanks will always favour the circular tank as this is the strongest engineering design and the cheapest way of erecting large containments. There are many different issues to consider before deciding on the final tank design, and the answer is seldom straight forward.
AKVA group´s most suitable recirculation solution is carefully designed in close cooperation with the client, ensuring that the production reaches maximum capacity as quickly as possible.