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Characteristics of Closed Recirculating Systems

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Application of Recirculating Aquaculture Systems in Japan

Part of the book series: Fisheries Science Series ((FISHSS))

Abstract

The most important requirement for a closed recirculating aquaculture systems (CRAS) is the maintenance of the water quality to ensure normal development and growth of the cultured fish. Since cultured fish discharges about 70% of their total dietary nitrogen into the culturing water, the essential functions of CRAS are as follows: (1) removal of nitrogen, especially ammonia nitrogen which is toxic to the fish and (2) removal of organic matter discharged by the fish. The standard components of CRAS used for grow-out are as follows: a culturing tank, sedimentation tank and physical clarification units (drum filter unit and foam separation unit) used to remove the organic matter, biofiltration units used mainly to remove ammonia nitrogen, disinfection units (e.g., ultraviolet irradiation unit, electrolysis unit, copper treatment unit, and so on), denitrification unit, oxygen supply unit, wastewater treatment units, recirculation pump, CO2 removal units, and temperature control units. In this chapter, the functions, principles, and practical examples of each CRAS component are discussed.

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Yamamoto, Y. (2017). Characteristics of Closed Recirculating Systems. In: Takeuchi, T. (eds) Application of Recirculating Aquaculture Systems in Japan. Fisheries Science Series. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56585-7_2

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