Microbial protein production from syngas, CO2, hydrogen, and methane has been successfully demonstrated in laboratories and at pilot scale. Several companies, such as String Bio convert natural gas (primarily CH4) to microbial protein, which has regulatory approval to be used as aquaculture feed. While many companies are using non-renewable gas sources, this commercial success convincingly demonstrates the feasibility of producing nutritious microbial proteins through gas fermentation. This approach ahs been investigated through a partnership between UQ, Monash, and ? (pending outcomes from a CRC-P).