Aquaculture (United States) — NAICS 11251

A Histometrics rollup primer for public- and private-market investors. It synthesizes the three child-industry primers (112511, 112512, 112519) plus federal ground-truth data for this level. Figures are reported facts with citations; statements about the future are labeled as judgments, not forecasts.

NAICS is the North American Industry Classification System, the federal scheme for tabulating industries; the 2022 revision defines industry 11251, "Aquaculture." [1]

1. Overview

Aquaculture is farming that happens in water: raising fish, shellfish, and other aquatic organisms to market size instead of catching them wild. NAICS industry 11251 gathers the whole activity into one place and then splits it into three child industries — finfish farming and fish hatcheries (112511), shellfish farming (112512), and other aquaculture (112519). [1] Together they make up a small but strategically important corner of U.S. food and specialty production: total U.S. aquaculture sales were $1.908 billion in 2023, up 26% from 2018, spread across 3,453 farms with sales (up 18%), averaging roughly $552,600 per selling farm — a small-farm, small-business industry by any measure. [2]

Why it matters beyond any one operator is the same story that runs through all three children: the United States imports roughly 80% of the seafood it eats and ran a $20.3 billion seafood trade deficit in 2023. [4][5] Domestic aquaculture is the obvious way to close that gap, and worldwide the shift is already underway — in 2022 aquaculture overtook capture fisheries as the leading source of aquatic animals. [10] That structural tailwind is genuine. So is the catch: this is a low-margin, biologically fragile, heavily permitted, overwhelmingly private industry with no large U.S.-listed pure-play in any of its three segments.

The real value of looking at 11251 as a whole is the contrast across its children. They share a code and a set of tailwinds and headwinds, but they are three different businesses with different sizes, growth rates, owners, and economics — a commodity fish-agriculture business, a coastal real-estate-and-bivalve business, and a grab-bag that runs from luxury alligator leather to specialty algae. Section 2 lays the contrast out side by side; the rest of the primer covers the level as a whole.

2. What's inside — the three children and how they differ

The USDA product categories don't map perfectly onto the three NAICS codes (baitfish, ornamental and sport fish sit in 112511; caviar and eels get swept into the "other" tables), so the shares below are approximate and drawn from the 2023 Census of Aquaculture. [2][3] The point is the relative picture, not decimal precision.

The three headline economic differences to carry forward:

• Feed is the dividing line. Finfish (112511) and inland shrimp/crawfish live and die by the feed conversion ratio — pounds of feed per pound of gain — because feed is the biggest cost. Marine bivalves (the core of 112512) filter wild plankton and need no purchased feed at all, which reshapes their whole cost structure. Alligator and microalgae (112519) sit somewhere between, with feed or energy as the swing cost. [3]
• What you actually own differs. In finfish it's a herd of fish plus (for RAS) an expensive building; in shellfish it's a scarce, permitted water lease with animals as the crop; in "other" it's either living luxury-leather inventory or a specialty-ingredient plant.
• Where the cycle comes from differs. Finfish and shellfish track seafood demand and import competition; alligator tracks the luxury-goods cycle (especially China); algae tracks supplement and aquafeed demand. One code, three different macro drivers.

3. How big it is (this level's rollup)

A data warning first — and an honest note on our ground truth. Our ingested federal stats file for NAICS 11251 contains no code-specific stat_metrics at all — there is no Census sales, firm-count, employment, or payroll figure for this node in our ground-truth set, so every number below is a cited external figure, labeled as such, not an ingested Histometrics metric. That gap is not an oversight; it reflects a real measurement problem the children all share. The standard federal business programs — the Economic Census, County Business Patterns (CBP), the Statistics of U.S. Businesses (SUSB), and Nonemployer Statistics — exclude Sector 11 (agriculture and aquaculture) entirely, and the Bureau of Labor Statistics' Quarterly Census of Employment and Wages (QCEW) excludes proprietors and unincorporated self-employed workers. [3] So the usual establishment/employment tables are blank for this industry. The authoritative source is instead the U.S. Department of Agriculture's (USDA) Census of Aquaculture, a special study run roughly every five years. [2]

The rollup picture (2023 Census of Aquaculture, released December 2024): [2][3]

Two federal anchors bound the sizing without adding to it. The SBA (Small Business Administration) receipts-based size standard is $3.75 million for all three child codes [6] — a government-contracting eligibility line, not a revenue estimate — and with the average selling farm at ~$552,600, essentially the entire industry falls under it. [2][6] Separately, Louisiana's crawfish sector alone runs roughly 1,600 farms across 359,000+ acres, worth over $170 million to producers [20] — a reminder that freshwater crawfish, not marine shellfish, is the single largest slice of 112512 by volume.

The undercount, plainly. Three forces make the official footprint look smaller than the real activity, and they compound at the rollup level: (1) standard Census business data skip agriculture, so the industry is invisible in the usual tables [3]; (2) a large slice of output is government and tribal hatcheries (the U.S. Fish and Wildlife Service alone runs 71 national fish hatcheries stocking well over 100 million fish a year) plus oyster-restoration programs — real fish, real budgets, near-zero recorded "sales" [12]; and (3) state-level census cells are sometimes withheld for confidentiality (no suppressed value is reproduced here). [2] Where small owner-operators and non-commercial stocking dominate — as they do here — treat the sales totals as a floor on activity, not a ceiling.

4. The investable universe — where value concentrates across the children

The through-line across all three children is stark: there is no large, diversified, U.S.-listed pure-play anywhere in 11251. Value concentrates in three pools, each reached differently. (Tickers appear only here and in Section 10.)

Pool 1 — Finfish economics, via foreign salmon majors (the only deep, liquid route). The most investable farmed-finfish economics are large-cap, sea-cage, non-U.S. businesses: Mowi (Oslo: MOWI; OTC: MHGVY), the world's largest salmon farmer, plus SalMar (SALM), Bakkafrost (BAKKA), and Grieg Seafood (GSF). [11] They are profitable and liquid, but expose you to salmon-price cycles, sea lice, and currency — not U.S. production. The U.S.-linked land-based names (AquaBounty, Nasdaq: AQB; Atlantic Sapphire, Oslo: ASA; The Kingfish Company, Oslo: KING) are small, distressed, or development-stage special situations, several carrying going-concern language — venture-style bets, not operating comparables. [18]

Pool 2 — Shellfish, an almost entirely private business. No U.S.-listed pure-play exists. The clearest private integrator is Taylor Shellfish Farms (family-owned Washington producer of oysters, clams, mussels, and geoduck across ~11,000 acres of tidelands); Pacific Seafood and Cooke Inc. add shellfish alongside broader seafood operations. The tiny listed adjacencies (NaturalShrimp, Blue Star Foods, Premium Brands via Clearwater) are speculative or wild-caught, not oyster/clam farming. [21] Exposure is through direct farm ownership, backing operators, or picks-and-shovels (hatchery seed, gear, cold chain).

Pool 3 — "Other," reached only indirectly. After the sole listed microalgae pure-play (Cyanotech) went private in early 2026, the cleaner routes are owning the buyer, not the farm: luxury houses that consume alligator hide — Hermès (Paris: RMS), LVMH (MC), Kering (KER) — and diversified algae-ingredient majors such as Corbion and DSM-Firmenich. [16][17][18] The actual farms (alligator, microalgae, kelp aggregators like Atlantic Sea Farms) are private.

The cross-child owner class that spans everything: private, family, and vertically integrated. The names that recur across children — Cooke (salmon, shellfish, hatcheries, processing), Pacific Seafood (finfish and shellfish), Riverence (egg-to-plate trout) — win by integrating hatchery → grow-out → processing → branded distribution. That, not the stock market, is where durable aquaculture value has actually been built.

5. How the money works

Every child is at bottom the same equation — revenue = volume × realized price, and profit turns on biological yield, mortality, input cost, and product mix — but the levers differ by segment, and an investor should never blend them into one "aquaculture multiple."

• Finfish (112511) is commodity agriculture. Owners earn the spread between the price a pound of fish fetches and the cost to grow it. Feed is the biggest cost (catfish feed ran over $400/ton in 2024, roughly double 2002 levels, and tracks soybean-meal and corn), so feed conversion ratio is the core lever; a single disease outbreak, low-oxygen event, or "off-flavor" episode can erase a year's margin. [7] Land-based recirculating aquaculture systems (RAS) are a different, capital-heavy bet — high capex and energy to grow premium fish near cities — with a punishing record of overruns and mass-mortality events. [18]
• Shellfish (112512) is a no-feed, capital-and-time business for bivalves: the big costs are seed, gear, labor, lease fees, and cold chain, but oysters take ~18–36 months to reach market size, so cash goes out years before the first crop sells ("inventory on the water"). The premium is in the branded half-shell (raw-bar) market. Crawfish is a different, rice-rotation, short-season model. [21]
• "Other" (112519) splits by value pool. Alligator is a luxury-leather business where the flawless belly hide, not the meat, is the prize, funded by multi-season working capital and a conservation model that pays landowners for wild eggs. Microalgae behaves like specialty chemicals (high value per kilogram, brand- and extraction-driven); kelp is a thin-margin crop dependent on aggregator buy-back contracts. [3][15]

The metrics that matter across all three: yield per acre/cage/pond/tank; survival and mortality by cohort; time from seed/stock to market; realized farm-gate price by species, size, and channel; feed/energy cost; customer concentration; working capital tied up in living inventory; and permit status. Vertical integration is the recurring path to better economics in every child.

6. What drives demand

• The import gap. Americans ate ~19.1 lb of seafood per person in 2023; NOAA (National Oceanic and Atmospheric Administration) estimates ~80% of it is imported, against a ~$20.3 billion trade deficit. [4][5] Any durable shift toward domestic, traceable, "grown-in-USA" product is a tailwind common to all three children.
• The global structural shift. Aquaculture surpassed capture fisheries worldwide in 2022 — farmed protein is the growth vector. [10]
• Segment-specific engines. Finfish rides "local/sustainable/antibiotic-free" branding (and stocking/recreation demand funded by public budgets); shellfish rides the premium raw-bar and sustainability halo (bivalves need no feed and clean the water); alligator rides the luxury handbag cycle, and algae rides supplement and aquafeed demand (astaxanthin, the pigment in farmed salmon, is a ~$537M global market growing ~7%/yr). [3][17][21]
• The shared caveat: demand growth does not guarantee domestic-farm profitability. Imported fish (catfish imports were ~68% of U.S. supply in 2023) and imported spirulina/skins can stay cheaper, and new domestic capacity often needs heavy capital before it produces reliably. [7]

7. Regulation

Aquaculture answers to an unusually crowded, fragmented set of agencies — there is no single streamlined federal permit for a farm — and that fragmentation is itself a barrier to entry and a quiet moat for incumbents holding good permitted sites.

• EPA (Environmental Protection Agency) — discharges need NPDES (National Pollutant Discharge Elimination System) permits; larger flow-through, recirculating, or net-pen operations (≥100,000 lb/yr) fall under the Concentrated Aquatic Animal Production effluent guidelines (40 CFR Part 451). [14]
• FDA (Food and Drug Administration) — regulates aquaculture drugs, feed, and seafood safety under Seafood HACCP (Hazard Analysis and Critical Control Point), and runs the National Shellfish Sanitation Program (NSSP) that classifies shellfish-growing waters; rain, pollution, or biotoxin blooms can trigger harvest closures that cut revenue overnight. [13]
• U.S. Army Corps of Engineers — permits structures in navigable waters (net pens, cages, racks), often via Nationwide Permit 48 for shellfish. [13]
• NOAA Fisheries — leads siting and environmental review for marine/offshore farms and is pushing Aquaculture Opportunity Areas to streamline permitting.
• USFWS (U.S. Fish and Wildlife Service) — runs the national hatchery system and enforces CITES (Convention on International Trade in Endangered Species) export rules for alligator hides (each carries a traceability tag). [12][15]
• State agencies add farm licensing, water-bottom leases, water rights, biosecurity, and fish-movement rules — often the binding constraint on where and how much you can grow.

For an investor the regulatory asset is not merely a license but a transferable, defensible, expandable production site with a clean compliance history.

8. Consolidation

Across all three children the pattern is the same: fragmented at the farm level, consolidating downstream.

• The farms stay small, local, and biologically site-specific — you cannot cheaply replicate a good catfish pond, a classified oyster lease, or an alligator egg-collection agreement. So national farm-level roll-ups don't really exist.
• Value concentrates in integration and the buyer. Finfish and shellfish consolidate through hatcheries, genetics, processing, and branded distribution (Cooke, Riverence, Pacific Seafood, Taylor); alligator consolidates through the luxury houses buying upstream into tanneries and farm supply; algae consolidates among a few ingredient majors (BGG now the largest natural-astaxanthin producer). [15][16][21]
• Antitrust and scarcity do bite. In 2025 Maine settled an antitrust case over Cooke's proposed acquisition of salmon-farm lease sites, forcing site divestitures on concentration and environmental grounds — a sign that scarce permitted water, not farms, is the contested asset. [19]

Expect selective, mostly private consolidation: proven operators and well-sited, well-permitted assets grow more valuable; speculative projects without financing, permits, or biological proof stay vulnerable.

9. Risks

The children share a common risk stack, which is exactly why 11251 has never produced a stable listed champion:

• Biological & weather. Disease, low-oxygen kills, off-flavor, harmful algal blooms, Vibrio, predators, hurricanes, drought, and acidification cause sudden, often uninsurable losses across every segment. [7][21]
• Input-cost / margin. Feed (soy, corn), energy, oxygen, labor, and freight can compress or erase thin margins fast — hardest on finfish and RAS. [7]
• Import & trade. Cheap imports cap domestic prices (catfish vs. pangasius, spirulina, exotic skins); trade policy swings prices more than any single competitor. [7]
• Capital & execution (RAS). Land-based finfish projects have a track record of overruns, dilutive raises, mass mortalities, and cancellations — the defining risk for the public-market names. [18]
• Regulatory, permitting & social-license. Multi-agency permitting, discharge limits, lease denials, escapes, CITES compliance, and local opposition can delay or kill projects. [14][15][19]
• Concentration / single-buyer (alligator's demand funnels through a few luxury houses) and discretionary-cycle exposure (raw-bar dining, luxury handbags). [21]
• Public-market & data-opacity. The listed universe is illiquid, dilutive, or development-stage; and because federal business statistics skip the sector, investors lean on a five-year USDA census — far less timely than the monthly data other sectors enjoy. [18]

10. How to invest, and the outlook

Public-market routes (thin, and never a pure-play).

• Finfish economics: foreign salmon majors (Mowi, SalMar, Bakkafrost, Grieg) via Oslo or U.S. OTC — the most liquid, profitable option, but large-cap, sea-cage, non-U.S. [11] The U.S. land-based names (AQB, ASA, KING) are restructuring/liquidity special situations — treat as venture, not income, and do not apply packaged-food multiples to farms that have not shown stable harvests. [18]
• "Other" economics: own the buyer — luxury equities (Hermès, LVMH, Kering) for alligator, or ingredient majors (Corbion, DSM-Firmenich) for algae — accepting that aquaculture is a sliver of each. [16][17]
• Shellfish: there is essentially no listed route at all.

Private-market routes (where the industry actually is). All three children are fundamentally private-capital businesses: direct ownership of or lending to farms; minority stakes in integrated platforms and RAS ventures; and the picks-and-shovels layer — feed, RAS and shellfish gear, hatchery genetics, water treatment, and processing/cold-chain — which often carries better risk-adjusted returns than the farms themselves. Diligence should center on survival, feed conversion, cost per kilogram, realized pricing, harvest consistency, customer concentration, working capital, permit status, lease transferability, and contingency funding.

Near-term drivers to watch (judgments, not guarantees): feed-grain prices and the catfish live-price/import balance; whether any U.S. land-based salmon farm finally reaches steady, profitable output; the pace of state shellfish-lease approvals and NOAA opportunity areas; the luxury cycle (especially China) that sets alligator-hide pricing; astaxanthin/aquafeed demand; and federal interest in reshoring seafood to shrink the ~$20 billion deficit. [4][5][7]

The honest synthesis. As a level, 11251 is a compelling story wrapped around a punishing scorecard. The structural case — a huge import gap, a global shift to farmed protein, and premium demand for local, traceable product — is real and shared across all three children. But the operational reality — thin margins, biological fragility, heavy fragmented permitting, and a graveyard of over-promised build-outs — is why capital has repeatedly been humbled here, and why the deepest liquid exposure is foreign salmon rather than anything U.S.-listed. The distinctive read is the spread across the children: shellfish is the fastest grower (crustaceans +75%, mollusks +30%) but almost entirely private; finfish is the largest but flat and import-pressured; "other" is tiny but houses a defensive luxury-leather supply chain and a higher-growth specialty-ingredient theme. Expect growth through regional and premium niches owned by vertically integrated, operationally proven, conservatively financed operators — not a rapid, public-market-friendly replacement of imports.

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Sources

1. U.S. Census Bureau, 2022 NAICS Definitions — 11251 Aquaculture and industries 112511, 112512, 112519 (and cross-referenced codes 114111/114112, 311710), 2022. https://www.census.gov/naics/?details=11251&year=2022
2. USDA National Agricultural Statistics Service (NASS), "USDA Releases the 2023 Census of Aquaculture Results" ($1.908 billion; 3,453 farms with sales; ~$552,569 average), Dec. 16, 2024. https://www.nass.usda.gov/Newsroom/2024/12-16-2024.php
3. USDA NASS, Aquaculture Highlights & Special Studies: Results from the 2023 Census of Aquaculture (component breakdowns — food fish, mollusks, crustaceans, and "other"; alligator, algae, sea-vegetable farms and sales), 2024. https://www.nass.usda.gov/Publications/Highlights/2024/Census22_HL_Aquaculture_08.pdf
4. NOAA Fisheries, U.S. Aquaculture and Fisheries of the United States 2023 (per-capita consumption ~19.1 lb; ~80% import reliance), 2024–2026. https://www.fisheries.noaa.gov/national/aquaculture/us-aquaculture
5. USDA Economic Research Service, "U.S. seafood imports exceeded exports by $20.3 billion in 2023," 2024. https://www.ers.usda.gov/data-products/charts-of-note
6. U.S. Small Business Administration, Table of Small Business Size Standards Matched to NAICS Codes (112511/112512/112519 = $3.75M average annual receipts), 2023. https://www.sba.gov/document/support-table-size-standards
7. American Farm Bureau Federation, "America's Top Farm-Raised Fish Faces Growing Pressures," 2025, and Alabama Cooperative Extension System, "2023 US Farm-Raised Catfish Industry Update" (feed costs; ~21% sales decline to ~$358M in 2024; imports ~68% of catfish supply), 2024–2025. https://www.aces.edu/blog/topics/aquaculture/us-farm-raised-catfish-industry-update/
8. USDA Agricultural Marketing Resource Center (AgMRC), "Trout" and "Tilapia" (2023 Census of Aquaculture data), 2024. https://www.agmrc.org/commodities-products/aquaculture
9. USDA NASS, 2023 Census of Aquaculture — Special Studies (miscellaneous/other aquaculture: alligators 36 farms ~$95.0M; algae 63 farms ~$40.4M; sea vegetables ~$1.3M), 2024. https://www.nass.usda.gov/Publications/AgCensus/2022/Online_Resources/Aquaculture/index.php
10. Food and Agriculture Organization of the United Nations (FAO), "Global Fisheries and Aquaculture Production Reaches a New Record High" (aquaculture surpasses capture fisheries in 2022), 2024. https://www.fao.org/newsroom/detail/fao-report-global-fisheries-and-aquaculture-production-reaches-a-new-record-high/
11. The Motley Fool, "Best Seafood Stocks and How to Invest in Them" (foreign salmon majors, tickers), 2026. https://www.fool.com/investing/stock-market/market-sectors/consumer-staples/food-stocks/seafood-stocks/
12. U.S. Fish & Wildlife Service, "National Fish Hatchery System" (71 national hatcheries; >100M fish stocked; live-fish/salmonid movement rules), 2024–2026. https://www.fws.gov/program/national-fish-hatchery-system/about-us
13. U.S. Food and Drug Administration, "Aquacultured Seafood" and National Shellfish Sanitation Program (Seafood HACCP; NSSP/ISSC; harvest-area closures), 2024–2026. https://www.fda.gov/food/seafood-guidance-documents-regulatory-information/aquacultured-seafood
14. U.S. Environmental Protection Agency, "Aquaculture NPDES Permitting" and "Concentrated Aquatic Animal Production Effluent Guidelines" (40 CFR Part 451; 100,000-lb threshold), 2024–2026. https://www.epa.gov/npdes/aquaculture
15. U.S. Fish & Wildlife Service, "American Alligators in CITES Export Programs," and Louisiana Department of Wildlife and Fisheries, alligator management (egg collection, ~5% return-to-wild, CITES tagging), 2024–2026. https://www.fws.gov/story/american-alligators-cites-export-programs
16. The Business of Fashion, "Why Luxury Brands Can't Shake the Controversy Around Exotic Skins" (Hermès, LVMH, Kering upstream integration), 2024. https://www.businessoffashion.com/
17. ResearchAndMarkets via BusinessWire, "Astaxanthin Market Report 2025" (~$537M in 2024; ~7.3% CAGR to ~$800M by 2030), Mar. 5, 2025. https://www.businesswire.com/news/home/20250305466679/en/
18. U.S. SEC filings and SeafoodSource: AquaBounty (AQB) 10-K (going-concern; exit of fish-rearing); Atlantic Sapphire (Oslo: ASA) H1 2025 results and $250M Miami-Dade bond; The Kingfish Company (Oslo: KING) trading updates; Cyanotech (formerly OTCQB: CYAN) Form 15 deregistration, filed Feb. 13, 2026. https://www.sec.gov/
19. Maine Office of the Attorney General, "State Settles Salmon Aquaculture Antitrust Suit" (Cooke lease-site divestitures), 2025. https://www.maine.gov/ag/news-and-library/press-releases
20. LSU AgCenter, "Evolution of the Louisiana Crawfish Industry," and USDA AgMRC, "Crawfish/Crayfish" (~1,600 farms; 359,000+ acres; >$170M to producers), 2023–2024. https://www.lsuagcenter.com/
21. NOAA Fisheries, "Understanding Shellfish Aquaculture" and "U.S. Oyster Aquaculture Market Outlook 2025"; Taylor Shellfish and Pacific Seafood company disclosures, 2024–2025. https://www.fisheries.noaa.gov/insight/understanding-shellfish-aquaculture