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The particle size distribution (PSD) in a recirculating aquaculture system (RAS) was investigated during a 24-h cycle. PSD was analyzed in water sampled at several locations in a recirculation loop containing a 60-μm drum filter, a submerged fixed-bed biofilter and a trickling filter.In relation to total counts, the system was dominated by micro-particles with particles smaller than 20μm comprising...
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