Brewer’s yeast as a protein source in the diet of tilapia (Oreochromis niloticus) and freshwater prawns (Macrobrachium rosenbergii) reared in a clear water or biofloc environment
Feed is the key to sustainable aquaculture independent if farmed in Sweden or Vietnam. This thesis investigate the possibility of using Brewer's yeast as an alternative to fish and soy meal as a local alternative. Brewer's yeast may not seem as a major volume, but a quick calculation reveal that on a global scale, 20% of present use of fishmeal could be replaced. However, the most novel part of the thesis is the application of so-called biofloc in a modern RAS environment, in the thesis named Bio-RAS. By farming the fish in a high density microbial environment an immediate recapture of lost nutrients are recaptured back as feed by the microbes, in the same rearing system. Nhi has shown in her work that the fish growth better, use less feed into the farm and are healthier, than fish farmed in the exact same facility, but without co-farming of microbes.