The Fishmeal Trap: Why Industrial Aquaculture Is Quietly Extractive

The Extractive Loop: How Farmed Fish Depend on Wild Fish

The framing that farmed fish reduces pressure on wild stocks is partially true and substantially misleading. It is true that aquaculture produces protein without targeting the wild stocks that premium seafood buyers most want to protect: tuna, cod, halibut, wild salmon. It is misleading because farmed salmon, trout, marine shrimp, and increasingly other high-value species consume large quantities of fishmeal and fish oil derived from wild-caught pelagic forage fish: Peruvian anchovy, Atlantic herring, Gulf menhaden, Pacific sardine. These forage fish are harvested at or near their ecological limit in most fishing grounds.

The loop is: wild fish caught from the ocean, reduced to meal and oil, fed to farmed fish that are then sold as the alternative to wild-caught fish. This is not inherently wrong if the conversion efficiency is positive and the source fisheries are managed at sustainable yield. The problem is both conditions are strained. The conversion efficiency of wild fish to farmed fish through the fishmeal pathway is roughly 4-5 kilograms of wild fish per kilogram of salmon produced (a combination of feed inclusion rates and FCR). And the source fisheries for Peruvian anchovy and others are operating at the ecological ceiling of their estimated maximum sustainable yield: they cannot grow to accommodate expanding aquaculture demand. The regenerative aquaculture pillar essay covers the full argument; this page addresses the fishmeal problem specifically.

Why Fishmeal Is Hard to Replace: The Protein and Omega-3 Problem

Fishmeal is difficult to replace because it solves two nutritional problems simultaneously: it provides highly digestible protein with an amino acid profile matched to carnivorous fish biology, and it contains the long-chain omega-3 fatty acids (EPA and DHA) that give farmed salmon their market-critical nutritional profile and colour. No single plant-based ingredient does both. This is why partial substitution is straightforward but full replacement is technically complex.

Salmon require 35-42 percent crude protein in their diet, with specific minimum levels of essential amino acids (lysine, methionine, threonine) that fishmeal delivers in the right ratios. Soy protein concentrate (SPC), the most common plant-protein replacement, delivers comparable crude protein content but has a slightly different amino acid profile and a lower digestibility coefficient. Salmon can tolerate soy at 20-30 percent diet inclusion with appropriate amino acid supplementation but show reduced performance at higher inclusion rates in some studies. The anti-nutritional factors in raw soy (trypsin inhibitors, saponins) require processing to make SPC palatable to fish; the processing cost is real but not prohibitive.

The omega-3 problem is the harder constraint. EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are the fatty acids that give salmon their cardiovascular health profile in human diets. Fish oil is the only commercially proven source of these fatty acids at production volume that is not an algal fermentation product. Algal oil derived from heterotrophic fermentation (Schizochytrium, Thraustochytrid species) produces EPA and DHA without marine catch. It is commercially available as of 2024-2026 from suppliers including Veramaris, but the price point remains above fish oil at most scale levels, though the gap is closing rapidly as fermentation capacity expands. The first commercial salmon operations using 100 percent algal-derived omega-3s have been documented as of 2023-2024.

The industry's current trajectory is partial substitution, not replacement. Fishmeal inclusion in Norwegian salmon diets fell from approximately 65 percent in 1990 to 12-15 percent by 2020 (source: Norwegian Seafood Council industry data, Naylor et al. 2021). This reduction was driven by price pressure, not regulatory mandate. The reduction happened because alternatives became cheaper and sufficiently effective at the inclusion rates used. The structural problem is that aquaculture production has grown faster than the reduction in fishmeal inclusion: total fishmeal demand from aquaculture has therefore not fallen even as inclusion rates per kilogram of feed have dropped.

The Price Trajectory: 2.4x Since 2000 and a Supply Ceiling in View

The 2.4x price increase in fishmeal from 2000 to 2022 is not a temporary shock. It is the result of two structural forces moving in opposite directions. Supply: wild pelagic fish landings have been essentially flat globally since the mid-1990s. The Peruvian anchovy fishery, which produces the majority of the world's fishmeal, is managed under catch quotas that fluctuate with the El Nino Southern Oscillation but do not trend upward in a sustained way. Total global reduction fishery catches are bounded by the productivity of specific ecosystems. Supply cannot grow to meet demand (IFFO data 2022; Tacon and Metian 2015).

Demand: global aquaculture production has grown at 4-5 percent per year for the past decade. Even with falling fishmeal inclusion per kilogram of feed, the total feed tonnage is growing fast enough that total fishmeal demand has not declined. The market response to inelastic supply and growing demand is a price that trends upward with periodic cyclical corrections around El Nino events. The 2.4x increase over 22 years understates the structural pressure because the industry has been partially substituting throughout that period. Without substitution, the increase would have been larger.

The relevance to aquaculture margin: feed cost represents 40-70 percent of variable operating cost in intensive finfish aquaculture (FAO cost analyses; Naylor et al. 2021). A 2.4x increase in the price of an ingredient that represents 25-45 percent of feed cost translates directly to margin compression. Operations that made no substitution progress between 2000 and 2022 saw their largest cost line grow by a factor of roughly 1.6-2.0x (25-45% of feed cost, times 2.4x price increase, relative to total feed cost). That is not recoverable through productivity improvement alone. It requires either feed reformulation, production system redesign, or both.

Three Exit Routes: IMTA, BSFL, and Algal Oil

The clearest near-term commercial path is a combination of IMTA plus BSFL substitution, with algal oil as the omega-3 complement as its price falls into range. A salmon operation that adds a kelp-mussel IMTA component, reformulates its salmon diet to 15-20 percent BSFL meal and 20-25 percent SPC, and transitions its fish oil allocation toward algal oil as it scales, will by 2027-2028 have materially reduced its fishmeal dependency while running a higher-margin operation on the same site. None of these three routes requires waiting for technology that does not exist. All three are commercially available at scale now.

The counterargument that fishmeal is still the cheapest protein per kilogram for farmed salmon deserves direct response. It is cheapest per kilogram at current externalised pricing: the wild-catch fishery's ecological cost is not included in the fishmeal price. IFFO price data shows a 2.4x increase 2000-2022 and the structural supply ceiling is visible. IMTA, BSFL, and algal oil are not parity plays at 2022 prices: they are hedges against the price trajectory that the supply situation makes structurally probable. An operation that made these transitions in 2020 is already running at better margin than one that did not, at 2026 fishmeal prices.

Where the Fishmeal Problem Sits in the Aquaculture System

The fishmeal trap is the upstream constraint that makes the rest of the regenerative aquaculture argument commercially urgent rather than merely ecologically interesting. Without fishmeal price pressure, the economic case for IMTA and feed substitution is weaker: the status quo is cheaper. With the documented 2.4x price increase and a structural supply ceiling, every percentage point of fishmeal removed from the diet compounds in value as prices continue rising.

IMTA addresses the fishmeal problem indirectly by reducing feed cost as a percentage of total variable cost. The kelp-shellfish-finfish stack does not reformulate the salmon diet. It adds zero-feed biomass to the same operation, which reduces the effective feed cost per kilogram of combined output. The salmon still eat fishmeal-containing feed, but the proportion of total revenue attributable to that feed cost falls. A 25 percent increase in total saleable biomass (the documented Bay of Fundy figure) means feed cost as a percentage of total revenue falls by roughly 20 percent even with no change in the diet formulation.

BSFL addresses the problem directly at the ingredient level. Black soldier fly larvae are the cheapest fishmeal substitute available at commercial scale as of 2026. At 15-20 percent inclusion in salmon diets, BSFL meal replaces an equivalent volume of fishmeal, reducing the operation's direct exposure to the fishmeal price index. The combination of IMTA-level output expansion and BSFL-level ingredient substitution is additive, not redundant: they operate on different parts of the cost equation.

The freshwater comparison matters here: Chinese carp polyculture operates at 30-40 million tonnes per year with minimal fishmeal dependency because its fed species (grass carp) are herbivores that consume plant material. The reason carp polyculture avoided the fishmeal trap is that it never entered it: the system was designed around species whose diets do not require marine-origin protein or omega-3 fatty acids. This is a design constraint, not an option: salmon biology requires the protein and omega-3 profile that fishmeal provides, and engineering that profile from non-marine sources is exactly what the BSFL and algal oil routes are doing.

The forward position: the fishmeal trap is not permanent. It is a transition problem from an industry that was built around cheap wild-catch protein before that protein approached its supply ceiling. The exit routes are commercial and scaling. The operations that navigate this transition earliest will have structural cost advantages that compound over the next decade of continued fishmeal price pressure. That is the investment case for IMTA and feed reformulation that operates on economics, independent of any other argument.