In particular, SCP grown on food processing waste waters (FPWWs) holds promise as a sustainable source of protein in animal feed. Collectively, FPWWs have attractive features for SCP production, such as a continuous global production of process water rich in dissolved carbon (C), nitrogen (N) and phosphorus (P) compounds. And are also considered to be free of pathogens, heavy metals, and other harmful contaminants. FPWWs can support microbial growth in bioreactors, from which cells can be recovered and dried leading to products suitable for animal feed ingredients, while concurringly avoiding the cost of treating such wastewaters, and hence represent an important step toward a circular bioeconomy.
“A promising alternative would be a whole-community approach for SCP production, leveraging the microorganisms already present in the wastewater. Microbial community-based SCP reduces the need for costly specific growth media, as well as the overall energy input required for SCP production, and can be more robust and resilient to process fluctuations, leading to more stable SCP production. Further, the use of a microbial community may result in a more diverse and nutritionally rich SCP, as various microorganisms contribute different amino acids, vitamins, and other essential nutrients to the final product” according to the study authors.
A recent study showed that microbial community-based SCP produced directly from soybean processing wastewaters contained essential amino acids for fish as well as taxa with probiotic potential. However, the feasibility of using such SCP as fish feed ingredient for aquaculture has yet to be established. Therefore, this study evaluated the use of microbial community-based SCP, produced from soybean processing wastewater, as a value-added alternative ingredient to fishmeal for cultured juvenile Asian sea bass.
Based on the results of this preliminary trial, 50 percent of the fishmeal protein might be replaced with microbial community-based SCP meal without negatively affecting Asian seabass growth or survival in the short term. Additional research is required to address potential long-term effects on fish health, growth, and overall sustainability of aquaculture production, and whether these effects vary as a function of fishmeal protein replacement.
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