Gas-fermented single-cell protein (methane, CO2 and industrial off-gas) instead of fishmeal and imported protein concentrates in feed

Replaces: a share of fishmeal and imported protein concentrates · Scope: aquafeed, pig, poultry, petfood · Evidence: medium-high (commercial, scaling)

The chemical problem#

• Fishmeal comes from reduction fisheries (anchoveta, sandeel and others): roughly a fifth of the world’s wild catch is ground into meal and oil, a capped and climate-sensitive supply that competes with direct human food use.
• Soy and rapeseed protein concentrates tie feed to land conversion, long import chains and volatile prices; the 2020-2022 spike hit import-dependent regions (much of Africa and the Middle East) directly in the feed cost.
• Both routes fix protein where the feedstock is - coastal Peru, the Amazon frontier, the Black Sea - while the animals are elsewhere. A fermentation route decouples feed protein from geography entirely.

Product overview#

Gas fermentation grows protein-rich microbes on one-carbon feedstocks that would otherwise be vented or flared:

1. Methane-based (methanotrophs, e.g. Methylococcus capsulatus): natural gas or biogas to bacterial protein meal (FeedKind-type; commercial plants in Europe and Asia). Biogas plants and gas-flaring sites become protein factories.
2. CO2 / steel off-gas-based: gas-fermenting acetogens convert industrial waste gases (steel mills, ferroalloys, refineries) into ethanol and, via protein pathways, into feed-grade biomass - the industrial-symbiosis route.
3. Methanol / syngas variants: the same biology with methanol or syngas from biomass gasification.

The product is a dried microbial biomass (65-77% crude protein) with a balanced amino-acid profile close to fishmeal. This article covers the gas route; for insect protein and the wider single-cell-protein landscape see FD02, and for fish-oil replacement (algal DHA) see FI06.

Active ingredient / Composition#

• Dried methanotroph/acetogen biomass: crude protein 65-77%, rich in lysine and methionine relative to soy; lipids 5-10%; nucleic acids 8-12% (processing and inclusion limits keep RNA within species rules; salmonids tolerate higher levels than monogastrics).
• Co-products: fermentation heat and CO2 streams reused on site; some routes co-produce ethanol or organic acids as the primary product with protein as the valorised by-stream.

Key facts#

Advantages#

• Feedstock flexibility with a climate bonus: methane and off-gas that would be emitted become feed - abatement and protein in one process; siting follows the gas, not the soil.
• No ocean or forest chain: no forage-fishery dependence, no deforestation frontier, no seasonal El Nino supply shocks.
• Consistent quality: fermenter-produced, batch-stable protein; free of the antinutritional factors and Salmonella-treatment baggage of soy.
• Local production everywhere: a fermenter can sit next to a biogas plant, a steel mill or a city waste stream - relevant for import-dependent regions.
• Salmon and shrimp trial data show fishmeal replacement without growth penalties at formulated share levels.

Mode of action#

Methanotrophs oxidise methane via methane monooxygenase into cellular carbon; in a nitrogen-rich, oxygen-limited fermenter the carbon stream is diverted into protein biomass. Acetogens fix CO2/CO with H2 or CO as the energy source (Wood-Ljungdahl pathway), producing cells and metabolites. The biomass is then harvested, processed (cell disruption, RNA reduction where required) and dried into a stable feed meal.

Application#

Limitations#

• Scale: global capacity is still measured in tens of thousands of tonnes - a drop against 400+ Mt of soybean meal; verdict is Partial at world level.
• Cost must beat the soy benchmark in most years; projects depend on cheap gas, CO2 or waste-heat integration.
• Nucleic-acid content limits monogastric inclusion rates; processing adds cost.
• Regulatory work per species/market (novel feed authorisations) is still expanding; acceptance programmes for consumers/farmers ongoing.

Evidence of displacement — D1: works, adoption not proven#

Assessment (hand-reviewed): Projection only: potential US production equal to 14% of the fishmeal market — not displacement.

Figures found (verified as quoted, but the assessment above explains why they do not count as displacement evidence for this substitution):

• displacement — Current technology could enable production in the United States equivalent to 14% of the global fishmeal market. (United States, 2021; peer-reviewed: nature.com)
• driver — Food security concerns and the need for local feed production are primary drivers for the adoption of gas fermentation in regions like Saudi Arabia. (Saudi Arabia, 2026; weak: agfundernews.com)
• performance — Feeding trials show that methanotroph bacteria meal can replace up to 24.80% of fishmeal protein in black sea bream diets without adverse effects on growth. (global, 2021; peer-reviewed: frontiersin.org)
• economics — Methanotrophic bacteria protein is priced at approximately USD 1,500 per metric ton, making it broadly competitive with fishmeal. (global, 2026; weak: feedinnovation.org)

Suppliers - real products and services (from the vendor index)#

Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service - matched 2026-09-29 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.

Government funding signals#

Scanned 2026-09-29 (OpenAIRE projects + US NSF keyword search); candidates reviewed by hand.

Signal: Moderate. 3 relevant grants · known amounts ≈ £0.19M + SEK 3.9M · jurisdictions: UK, Sweden.

Scientific evidence#

• Ritala A, Häkkinen ST, Toivari M, Wiebe MG (2017). Single cell protein - state-of-the-art, industrial landscape and patents 2001-2016. Frontiers in Microbiology 8: 2009.
• Matassa S, Boon N, Pikaar I, Verstraete W (2016). Microbial protein: future sustainable food supply route with low environmental footprint. Microbial Biotechnology 9: 568-575.
• Øverland M, Tauson AH, Shearer K, Skrede A (2010). Evaluation of methane-utilising bacteria products as feed ingredients for monogastric animals. Archives of Animal Nutrition 64: 171-189.
• Strong PJ, Xie S, Clarke WP (2015). Methane as a resource: can the methanotrophs add value? Environmental Science & Technology 49: 4001-4018.
• Pikaar I, Matassa S, Rabaey K, et al. (2018). Decoupling livestock from land use through industrial feed production pathways. Environmental Science & Technology 52: 7351-7359.

Bioeconomy value#

Gas fermentation is the clearest example of the bioeconomy eating into two problems at once: it turns a potent greenhouse gas or a waste stream into a high-value feed ingredient, and it loosens the feed system’s grip on oceans and forests. For regions that import both fuel gas infrastructure and protein, it converts an existing industrial asset - biogas, a steel mill, a methanol hub - into local feed sovereignty.

Part of the feed-inputs programme: see FD02 for the insect and wider SCP field, FD01 for amino-acid balancing, FI06 for algal DHA oils.