\(Spirulina\) :
\(Spirulina\), a biomass of cyanobacteria, is grown easily on materials like straw, waste water like sewage, animal manure, molasses etc. Spirulina is not only a source of single cell proteins (containing \(60\%\) of its dry weight in protein) but also contains vitamins, minerals, fats and carbohydrates
\(Methylophilus~methylotrophus\) :
\(Methylophilus~methylotrophus\) is a bacterial species that is used as SCP. Since it has a high rate of growth (generation time- 2 hours), the production of protein per day is 25 tonnes \((25 \times 10^3~kg)\) which is much higher than the regular food sources of protein. It has 50 to \(80\%\) of its dry weight as protein.
Propionibacterium shermanii :
Propionibacterium shermanii is a bacterium used for Swiss cheese production.