What are the main hazards in seafood HACCP?

The species-specific hazards are histamine (scombrotoxin) in fish like tuna and mahi-mahi, pathogens such as Listeria, Clostridium botulinum, and Vibrio, aquaculture drug residues in farmed fish, natural toxins like ciguatera and shellfish poisons from harvest waters, and parasites in fish eaten raw. Because these travel with the species, the hazard analysis must start from the fish itself.

Why can't cooking control histamine in fish?

Histamine, or scombrotoxin, is heat-stable. Once bacteria form it in a temperature-abused scombroid fish like tuna or mahi-mahi, cooking does not destroy it. The only effective control is preventing its formation through cold chain from the harvest vessel forward, which is why receiving temperature and vessel handling history are central to a seafood HACCP plan for these species.

Is seafood exempt from FSMA preventive controls?

Partly. Under 21 CFR 117.5, subparts C and G of the FSMA preventive controls rule, the hazard analysis and risk-based preventive controls and the supply-chain program, do not apply to activities subject to and complying with Part 123. Seafood processors run seafood HACCP instead of HARPC, but current good manufacturing practice under Part 117 subpart B still applies.

Do seafood importers need a HACCP plan?

Importers do not necessarily run a processing HACCP plan, but under Part 123 they must have and implement written verification procedures confirming that the fish and fishery products they import were processed under conditions that meet the seafood HACCP requirements. Source verification and supplier controls do much of this work, especially for hazards like aquaculture drug residues.

When did seafood HACCP become mandatory?

FDA published the seafood HACCP regulation, 21 CFR Part 123, on December 18, 1995, and it became effective December 18, 1997. That makes seafood one of the earliest mandatory HACCP sectors in the United States, alongside juice under Part 120 and federally inspected meat and poultry, and years ahead of the broader FSMA preventive controls rule.

Seafood HACCP Explained

Q: What is the FDA Fish and Fishery Products Hazards and Controls Guidance?

It is FDA's companion document to 21 CFR Part 123, providing species-by-species and process-by-process guidance on identifying seafood hazards and choosing controls, including recommended critical limits and monitoring. It is now in its fourth edition, issued in June 2022, and functions as the practical starting point and benchmark for seafood HACCP plans.

The oldest mandatory HACCP sector in the U.S., and the one with hazards that travel with the species.

Seafood HACCP is the FDA-mandated food safety system for processors and importers of fish and fishery products, set out in 21 CFR Part 123. It requires a hazard analysis and, where significant hazards exist, a written HACCP plan, and it carries species-specific hazards, like histamine, that no other food category has to manage the same way.

Seafood was first. FDA required HACCP for fish and fishery products in 1995, effective 1997, years before FSMA brought preventive controls to the rest of the food supply. That head start is why seafood sits in its own regulatory lane today: when FSMA arrived, seafood processors already complying with Part 123 were carved out of the newer preventive controls rule. This guide covers what Part 123 requires, the hazards unique to seafood, the guidance document every seafood plant works from, and how seafood HACCP relates to the broader FSMA world.

What is seafood HACCP?

Seafood HACCP is the mandatory application of the Hazard Analysis and Critical Control Point method to fish and fishery products, required of processors and importers under 21 CFR Part 123. Every processor must conduct a hazard analysis of each kind of fish and fishery product it produces; wherever that analysis finds a hazard reasonably likely to occur, the processor must have a written HACCP plan that controls it.

The regulation dates to December 18, 1995, and took effect December 18, 1997, making seafood one of the earliest mandatory HACCP sectors in the U.S. alongside juice and federally inspected meat and poultry. It applies both to domestic processors and to importers, who must verify that the fish they bring in was produced under conditions that meet Part 123.

Part 123 sits on top of two supporting layers. Processors must also follow sanitation control procedures, the seafood analog of a formal sanitation program, monitoring key sanitation conditions and keeping sanitation records. And they operate under current good manufacturing practice. HACCP is the hazard-control engine, but it runs on a sanitation and GMP foundation.

What hazards are unique to seafood?

Seafood's defining feature is that its hazards are tied to species and to how a fish was caught, farmed, and handled, not just to the process in your plant. A hazard analysis that ignores the species is wrong before it starts. The major categories:

The species-specific hazards that make seafood HACCP distinct. Because these travel with the fish, the hazard analysis has to begin from the species and its harvest, farming, and handling history, the FDA guidance maps them out.

Histamine (scombrotoxin). In scombroid species such as tuna, mahi-mahi, and mackerel, bacteria form histamine when the fish is temperature-abused after catch. Histamine is heat-stable, so cooking does not remove it, the control is cold chain from the vessel forward, which is why receiving temperature and harvest-vessel history are so central to a tuna processor's plan.
Pathogens. Listeria monocytogenes in ready-to-eat products like smoked fish, Clostridium botulinum in reduced-oxygen and vacuum packaging, and Vibrio in raw molluscan shellfish are the recurring biological hazards, each with its own control strategy.
Aquaculture drug residues. Farmed fish and shrimp can carry residues of unapproved animal drugs or approved drugs used improperly, a chemical hazard controlled largely through supplier approval and source verification.
Natural toxins. Ciguatera toxin in certain large reef fish and the shellfish toxins (paralytic, amnesic, neurotoxic, and diarrhetic shellfish poisoning) come from the harvest environment, so control depends on harvest-area status rather than anything done in the plant.
Parasites. Fish intended to be eaten raw or undercooked can carry parasites; the standard control is a defined freezing step, which is why sushi-grade fish is frozen to specification.

Histamine deserves a closer look, because it inverts the usual food-safety instinct. There is no kill step for it, the control is time and temperature from the moment the fish leaves the water, which makes cold-chain handling and sanitary transportation part of the hazard control itself, not a logistics afterthought. Every warm hour on the vessel, on the dock, or on the truck adds histamine that the plant can never remove.

For scombroid species, histamine is a relay handoff: risk builds at catch, on the vessel, at landing, and in transit. The processor controls only the final receiving step, which is why a documented receiving temperature check does the work of judging the whole chain.

What is the FDA Fish and Fishery Products Hazards and Controls Guidance?

The Hazards and Controls Guidance is FDA's companion document to Part 123, the reference seafood processors use to identify the hazards associated with their species and to choose control strategies. It is comprehensive: species-by-species and process-by-process, with recommended critical limits and monitoring approaches. It is now in its fourth edition, issued in June 2022.

The guidance is not itself the regulation, it is FDA's current thinking, but in practice it functions as the starting point for nearly every seafood HACCP plan. When an investigator reviews a seafood plan, the guidance is the yardstick they measure the hazard analysis against. A processor whose plan diverges from the guidance can still be compliant, but should be ready to justify the science behind the difference.

How is seafood HACCP carved out of FSMA preventive controls?

When FSMA created the Preventive Controls for Human Food rule (21 CFR Part 117), it did not stack a second hazard system on top of seafood. Instead, it exempts seafood from the parts that would duplicate Part 123. Under 21 CFR 117.5, subparts C and G of the preventive controls rule, the hazard analysis and risk-based preventive controls requirements and the supply-chain program, do not apply to activities at a facility that is required to comply with, and is complying with, Part 123.

The practical translation: a seafood processor runs seafood HACCP under Part 123, not HARPC. It does not write a preventive controls plan for the same activities and does not need a Preventive Controls Qualified Individual for them the way a general food facility does. It does, however, still operate under the current good manufacturing practice requirements in Part 117 Subpart B. Seafood is carved out of the hazard-analysis machinery, not out of GMP.

Element	Seafood processor (Part 123)	General food facility (Part 117)
Hazard system	Seafood HACCP	Hazard analysis and risk-based preventive controls (HARPC)
Governing rule	21 CFR Part 123 (since 1997)	21 CFR Part 117 subparts C and G
Trained individual	HACCP-trained individual	Preventive Controls Qualified Individual (PCQI)
Reference document	FDA Fish and Fishery Products Hazards and Controls Guidance	FDA Draft Guidance for Preventive Controls
GMP baseline	Applies (Part 117 subpart B)	Applies (Part 117 subpart B)

Seafood processors follow Part 123 HACCP rather than the FSMA preventive controls hazard machinery, under the 21 CFR 117.5 exemption, while still meeting current good manufacturing practice.

The same carve-out exists for juice under Part 120. It is the reason a seafood or juice team fluent in the seven HACCP principles is already most of the way to compliance without ever writing a HARPC plan, and why the broader HACCP method is worth learning cold.

How do you build a seafood HACCP plan?

A seafood HACCP plan follows the classic sequence, but with seafood's species-first twist baked into the early steps.

Describe the product and its species. Identify each species, whether it is wild or farmed, its intended use (raw, ready-to-eat, cook-before-eat), and its packaging, because these determine which hazards are realistic.
Conduct the hazard analysis using the FDA guidance. For each species and process step, work through the Hazards and Controls Guidance to identify the biological, chemical, and physical hazards reasonably likely to occur.
Identify the critical control points where a significant hazard must be controlled, a cook step, a freezing step for parasites, receiving temperature for histamine, harvest-area verification for shellfish toxins.
Set critical limits for each CCP, drawing the values from the guidance, regulation, or a scientific study.
Establish monitoring, corrective actions, verification, and records the remaining HACCP principles, and maintain the sanitation control records Part 123 requires alongside the plan.
For importers, build supplier verification that confirms imported product was processed under Part 123-equivalent controls.

Seafood HACCP by the numbers

The primary sources behind seafood HACCP:

Seafood HACCP is required under 21 CFR Part 123 published December 18, 1995 and effective December 18, 1997 (eCFR, 21 CFR Part 123).
The FDA Fish and Fishery Products Hazards and Controls Guidance is in its 4th edition (June 2022) and is the reference for seafood hazard analysis (FDA, Hazards and Controls Guidance).
Seafood processors complying with Part 123 are exempt from subparts C and G of the FSMA preventive controls rule under 21 CFR 117.5 (eCFR, 21 CFR 117.5).

Seafood HACCP lives or dies on records that arrive on time: receiving temperatures for histamine species, harvest-area status for shellfish, freezing logs for parasite control, and the sanitation monitoring Part 123 demands. On paper those records scatter, and the gap between what the plan says and what the logs show is where an FDA investigator spends the visit. Harmony turns CCP checks, receiving logs, and sanitation records into live, searchable data captured at the station, layered on the systems a plant already runs with no rip-and-replace, and it lets a quality manager answer questions about decades of production history in plain English. A spirits manufacturer replaced its paper production logging entirely on the same foundation. It pairs naturally with a plant's traceability program and its broader GMP discipline, and with the FSMA 204 traceability rule, which reaches many seafood products directly.