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Recirculatory Aquaculture System (RAS)


Recirculation Aquaculture System (RAS) is a generation in which water is recycled and reused after filtration and elimination of suspended rely and metabolites. The approach is used for highdensity lifestyle of diverse species of fish utilising minimal land place and water. It is an in depth approach (better densities and greater rigorous management) than different aquaculture manufacturing structures. Instead of the conventional approach of developing fish outside in open ponds and raceways, on this device fish are commonly reared in indoor tanks in a “controlled” environment. Recirculating structures clear out out and easy the water for recycling it lower back thru fish lifestyle tanks. The generation is primarily based totally on using mechanical and organic filters, and the approach can in precept be used for any species grown in aquaculture. New water is introduced to the tanks simplest to make up for splash out, evaporation and for that used to flush out waste materials. The reconditioned water circulates thru the device and no greater than 10% of the full water quantity of the device is changed daily. In order to compete economically and to effectively use the sizeable capital funding withinside the recirculation device, the fish farmer wishes to develop as an awful lot fish as feasible withinside the in-built capacity. However, as a way to inspire small-scale fish farmers and marketers and additionally to facilitate fish manufacturing in city and peri-city regions wherein land and water are scarce, it’s miles proposed to sell Backyard Recirculation Aquaculture Systems.


Land primarily based totally aquaculture is maximum normally undertaken in dugout earthen ponds and frequently huge stretches of fertile agricultural land receives transformed into fish ponds for this purpose. Further, a huge amount of water is wanted to replenish aquaculture ponds and the used water is frequently discharged untreated into the open. Given the reality that conventional techniques of fish farming in India is capable of produce 2–10 tonne/hectare and on the equal time makes use of extra than 20 litres of water according to kg of fish, Recirculation Aquaculture System may also want most effective 1/eighth of a hectare and 1/sixth of water and nonetheless could be capable of produce as much as 60 tonne fish according to year. Being relatively efficient, usage of herbal assets may be very restrained and effects in conservation of treasured herbal assets like water, land and environment.

Status and Potential:

Our united states of america ranks accurate in freshwater fish manufacturing as even conventional techniques of fish farming are capable of produce everywhere among 2–10 tonne consistent with hectare consistent with yr. But, a Recirculation Aquaculture System may also produce as much as 500 tonne fish consistent with yr in identical area. Recirculation Aquaculture is a particularly new practice. Establishment of those gadgets will consequently enhance the know-how base of fish farmers approximately rising and destiny technology in aquaculture. Operation of those gadgets is extra traumatic in phrases of technology, techniques, biology of cultured fish and stringent water great parameters. There is deficit of right know-how, knowledge in technical control of Recirculation Aquaculture Systems (RAS) and entrepreneurial mind-set for industrial scale gadgets. The excessive funding expenses may also have saved RAS Technology farfar from our united states of america till now. But there’s an outstanding capability for it in India and with developing hobby RAS Units (large and small) are arising in Uttar Pradesh, Bihar, Andhra Pradesh and elsewhere. In the subsequent five years, those are going to be visible in lots of locations in India for certain and RAS will be the subsequent large issue to occur in Inland Fisheries Sector withinside the united states of america.

Project Location and Implementation:

A. Site Selection:

Selection of a good site is extremely important, although Recirculation Systems are desirable where only limited water is available for removal of fish wastes out of the production system. Passing water through a treatment unit removes ammonia and other waste products achieving the same effect as a flow-through configuration. Land measuring approximately 100 m2 is required for the construction of a Backyard RAS Unit.

B. Beneficiaries:

Beneficiaries include women SHGs/ fisherman societies/ fish farmers/ entrepreneurs; selection would be based on their interest and awareness. Beneficiary selection is done through a ‘Call for Application’ via newspaper and NFDB Website.

C. Project Implementation:

  • Project will be implemented by the beneficiary with technical support from the Designated Technology/Service Provider and Dept. of Fisheries of the State Govt.
  • • Financial assistance in the form of subsidy will be obtained from Govt. (Central/State) and the remaining amount will have to be borne by the beneficiary through self-finance, bank loan, etc.

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