Danske firmaer, institutioner, fiskeopdrættere, organisationer og enkeltpersoner med interesse for recirkulations-teknologi i akvakultur har stiftet brancheorganisationen AquaCircle
Recirculated aquaculture system (RAS) is not restricted to fancy
indoor facilities with concrete tanks. This is a VIDATEC RAS shrimpfarm under
construction in Vietnam. The system consist of a raceway-system for
nursing the post-larvae and grow-out ponds. The nursery and two grow-out
ponds will be covered whereas two grow-out ponds will be in the open. All
ponds will be lined and moving-bed biofilters will convert ammonia to
nitrate, fixed-bed biofilters will collect particles (organic matter) -
thus the water is constantly treated to secure optimal conditions for
the shrimp. The very little new water needed is pumped from a sedimentation pond to a treatment station with
filters, UV and ozone treatment - to eliminate/reduce the risk of introducing pathogens and parasites.
Brazil has great opportunities for expansion of aquaculture. The many rivers host a lot of fish - of which only a small number has been domesticated. The picture show the entrance to a hatchery.
FREA - farming fish in rainwater
Fully recirculated trout farm in Denmark (FREA). Perculated rainwater is catched in drainage-pipes. 5 kilometers of these has been digged in 5 meters depth. The small amount of water - mainly origin from dewatered sludge - is led out on the same sandy soil to perculate for later reuse - a natural recirculated system. Picture showing some indoor raceways with fingerling-trout.
A new chapter in Vietnamese aquaculture
Construction of a raceway-system in Vietnam - for farming Pangasius in an intensive but sustainable way. Low feed conversion rate, better growth-rate, lower mortality and no use of chemical - this is the ambition. The system was stocked in february 2016 and a growth period to reach harvest-sized fish (1 kg) is expected to be 4-6 month.
Keep it simple
Some times simple solutions work very nicely. Picture showing the last step of treatment of the outlet-water from a salmon smolt facility in Chile. The reject water from sludge dewatering is spread out on the top of a bed filled with wood-chips and earth-worms. The worms consumes the bacteria and finally the wood has been composted and can be used as soil-improvement.
The facility is covered to protect the worms from predatory birds!
The raceway-system in Can Tho (Mekong delta) is ready and stocked with 140 fish/m2. Expected growth period from 30 gram to 1 kg: 4-6 month
AquaCircle conference in Brazil with more than 200 participants - learning about RAS (Recirculated Aquaculture System) - pro's and con's.
AquaCircle visiting Soichiro Hayashi - the biggest trout-farmer in Japan.
In the background; Broodstock of Coho-Salmon
Do it yourself: Production of pure Oxygen - on site - always available.
Brazil offers ideal conditions
....for farming warm freshwater species - like catfish and tilapia.