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Previous research indicates that rainbow trout Oncorhynchus mykiss begin to exhibit health and welfare problems when cultured within water recirculating aquaculture systems (WRAS) operated at low exchange (6.7 days hydraulic retention time) and a mean feed loading rate of 4.1kgfeed/m 3 daily makeup flow. These studies could not conclusively determine the causative agent of the health and welfare...
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