Mr. Jacob Bregnballe is the BusinessDirector of the Land Based Aquaculture division in AKVA group. He holds aMaster of Science from Copenhagen University, Denmark, and is an expert onrecirculation aquaculture systems (RAS). He has a very strong background fromdesign and engineering in the world aquaculture market for more than 30 years.
Mr. Bregnballe started his career at theDanish Trout Culture Research Station and has been managing his own fishfarming enterprise for 20 years producing 2.000 tons large rainbow trout peryear. He has worked as an international aquaculture consultant for the Food& Agriculture Organisation (FAO) under the United Nations (UN). He is theformer President and Chairman of the Board of the Fish Farmers Organisation inDenmark, and has gained extensive experience from Research & Developmentprojects working closely with Universities in several programmes foraquaculture.
Positions in professional bodies: AdvisoryBoard Member DTU Aqua, Danish Technology University 2008、Chairman of the Association ofDanish Aquaculture Technology Suppliers 2010、Appointed Member, SCIENCE, Educational Board, Copenhagen University,2013.
RAS是基地養(yǎng)魚的未來，因?yàn)樗c傳統(tǒng)的漁業(yè)養(yǎng)殖相比具有更多的優(yōu)勢(shì)。目前，大多數(shù)的基地漁業(yè)養(yǎng)殖的發(fā)展都與RAS技術(shù)息息相關(guān)，毫無疑問，它將在水產(chǎn)行業(yè)的未來扮演一個(gè)十分重要的角色。Recirculation Aquaculture System (RAS) technology is a new and moderntrend in land based fish farming. The water in the fish farm is recycled by theuse of pumps, mechanical cleaning systems and biological filters. Thetechnology can be used for many different fish species and is increasingrapidly in many areas of the fish farming sector. The systems vary from hugeplants generating several thousand tonnes of fish per year to smallersophisticated systems used for fry and fingerling productions.
Recirculation can be carried out atdifferent intensities depending on how much water is recirculated. Some farmsare super intensive farming systems installed inside a closed insulatedbuilding using as little as 0,3 m3 of new water per kilo of fish produced peryear. Other systems are traditional outdoor farms using around 1 m3 of newwater per kilo of fish produced per year. A traditional flow-through system fortrout will typically use around 30 m3 per kilo of fish produced per year. So,introduction of RAS easily reduces the need for water by more than 95%.
Traditional fish farming is totallydependent on external conditions such as the water temperature of the river,cleanliness of the water, oxygen levels, or weed and leaves drifting downstreamand blocking the inlet screens, etc. In a recirculated system these externalfactors are eliminated. RAS enables the fish farmer to control all parametersin the production.
Controlling parameters such as watertemperature, oxygen saturation, light etc. gives stable and optimal conditionsfor the fish, which again gives less stress and better growth. These stableconditions result in a steady and foreseeable growth pattern that enables thefarmer to precisely predict when the fish will have reached a certain stage orsize. The major advantage of this feature is that a precise production plan canbe drawn up and that the exact time the fish will be ready for sale to themarket can be predicted. This favours the overall management of the farm andstrengthens the ability to market the fish in a competitive way.
Intensive fish farming requires closemonitoring and control of the production in order to maintain optimalconditions for the fish at all times. In the modern farm, a smart centralcontrol system will monitor and control oxygen levels, temperature, pH, waterlevels and motor functions. If any of the parameters moves out of the presethysteresis values, a start/stop process will solve the problem. If the problemis not solved automatically, an alarm will start. Also, automatic feeding canbe an integrated part of the central control system. This allows the timing ofthe feeding to be coordinated precisely with a higher dosage of oxygen as theoxygen consumption rises during feeding.
RASis the future in land based fish farming because it gives so many advantagescompared to traditional fish farming. Today most of the land based fish farmingdevelopment concerns RAS technology, and there is no doubt that
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