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United States

Kentucky—Research—RAS Versus Biofloc


The objective of this study was to compare two, indoor, shrimp production systems—a clear water recirculating system (CW) and a biofloc system (BF)—on production and water quality dynamics.  The researchers also estimated the nutritional contribution of bioflocs.


Conclusions: In this study, CW tanks had significantly higher concentrations of ammonia and pH, while those in the BF treatment had significantly higher levels of nitrite, nitrate and turbidity.  The data obtained from stable isotope analysis indicated that shrimp in the BF system obtained between 18-60% of the carbon and 1-16% of the nitrogen in their tissues from bioflocs.  Even so, these nutritional contributions from biofloc were not related to better shrimp production.  Individual body weight, total biomass and feed conversion ratio were significantly better in the CW treatment than in the BF treatment.  Although exact reasons for differences in production are not clear, dissimilarities in water quality may have played an important role.  The results of this study indicate that clear water RAS may be a more productive option than BF systems for indoor shrimp production.


Source: Aquaculture Magazine (Editor, Greg Lutz, glutz@agcenter.lsu.edu).  Indoor Shrimp Aquaculture: Which Is Best?  A Biofloc System or a Recirculating Aquaculture System.  Andrew J. Ray (Email andrew.ray@kysu.edu), Thomas H. Drury and Adam Cecil (Division of Aquaculture, Kentucky State University Land Grant Program, 103 Athletic Road, Frankfort, Kentucky 40601, USA).  Volume 43, Number 4, Page 16, August/September 2017.


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