The gap register

Everything the rulebook doesn't say

Each entry names the hazard, the authority currently stretched to cover it, what precisely is missing, what would close it, and who has the pen. This is the working list the platform is built to shrink.

critical

high

moderate

critical

system

guidance needed

Regulatory classification of dried seaweed

What covers it now

FDA Part 117 / Part 123 ambiguity; CDPH district interpretation

Who can close it

CDPH Food and Drug Branch (state); FDA CFSAN (federal)

The gap

Whether drying makes seaweed a processed food has no written answer in California, and no federal determination to lean on. Operators are told different things by different offices.

What would close it

A written CDPH determination for California, and a federal determination or FDA guidance letter that states can adopt.

National Sea Grant Law Center (2024)

critical

system

guidance needed

No California seaweed hazard and controls guide

What covers it now

None. Operators borrow Connecticut's guide and FDA's finfish/shellfish chapters.

Who can close it

California Sea Grant with CDPH and CDFW

The gap

There is no California document that tells an operator which hazards are reasonably likely to occur for California species and California waters, or what critical limits to use.

What would close it

A CDPH/CDFW-endorsed California seaweed hazards guide, structured like Connecticut's, covering California species and the upwelling/biotoxin regime.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

critical

biological

rulemaking needed

Harvest and grow-out water quality

What covers it now

Shellfish growing-water classification and CDPH biotoxin closures, used informally

Who can close it

CDPH with CDFW; ISSC/FDA for the national model

The gap

Seaweed waters are not classified. Sewage-influenced, runoff-influenced, and unclassified areas are harvested on operator judgment, with rainfall holds applied voluntarily.

What would close it

Either extension of NSSP-style classification to seaweed harvest areas, or a seaweed-specific water quality classification with defined closure triggers (rainfall, spill, bloom).

Interstate Shellfish Sanitation Conference / FDA (current)Kelpful (2020)Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

critical

biological

rulemaking needed

Enteric pathogens from the harvest area (Salmonella, E. coli, norovirus, Vibrio spp.)

What covers it now

General Part 117 hazard analysis; no seaweed-specific criteria

Who can close it

FDA CFSAN; CDPH for interim state criteria

The gap

No sampling plan, indicator organism, or acceptance criterion is specified for seaweed. Fresh, raw-consumed product carries the highest exposure and the least guidance.

What would close it

Seaweed-specific microbiological criteria and a sampling frequency tied to harvest-area classification and product form (fresh vs. dried).

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)National Sea Grant Law Center / Seaweed Food Safety Working Group (2021)

critical

process

capacity needed

Drying and dehydration process validation

What covers it now

None specific. Operators set their own time, temperature, and endpoint.

Who can close it

California Sea Grant extension research with processors; FDA guidance to follow

The gap

No water activity endpoint, no validated time/temperature combinations, no guidance on solar vs. mechanical drying, and no standard for verifying the endpoint.

What would close it

Validated drying schedules and a water activity target for the major California species and product forms.

National Sea Grant Law Center (2024)Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)Kelpful (2020)

high

biological

guidance needed

Vibrio growth during warm-water harvest and transport

What covers it now

Temperature-abuse controls by analogy to shellfish

Who can close it

FDA; California Sea Grant for validation research

The gap

There is no time-to-temperature standard for seaweed between harvest and chill. California's summer intertidal harvest conditions can be well above shellfish trigger temperatures.

What would close it

A validated time/temperature control for seaweed cold-chain onset, and clarity on whether shellfish Vibrio control plans apply.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)Kelpful (2020)

high

chemical

capacity needed

Marine biotoxins (domoic acid, PSP, DSP) on and in seaweed

What covers it now

CDPH shellfish biotoxin program, used as a proxy

Who can close it

CDPH; California Sea Grant / Scripps for the science

The gap

Toxin retention on seaweed surfaces and in tissue is poorly characterized, and no seaweed action level exists. Harvesters use bivalve closures because that is all there is.

What would close it

Retention and depuration data for California species, then a seaweed action level or a formal rule adopting shellfish closures as binding for seaweed harvest.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)Kelpful (2020)

high

chemical

rulemaking needed

Inorganic arsenic, cadmium, lead, and mercury

What covers it now

No federal action level for seaweed; buyers apply EU or private limits

Who can close it

FDA CFSAN

The gap

Operators cannot demonstrate compliance against a standard that does not exist, and cannot defend a passing result to a buyer using a different reference.

What would close it

Species-aware action levels or tolerable-intake guidance for edible seaweed, plus a recognized method and lab reference.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)National Sea Grant Law Center / Seaweed Food Safety Working Group (2021)

high

chemical

guidance needed

Iodine load and consumer disclosure

What covers it now

General labeling rules; no iodine-specific requirement

Who can close it

FDA; state guidance in the interim

The gap

Kelp products can deliver many times the recommended daily iodine intake per serving with no required disclosure or serving guidance.

What would close it

Iodine labeling or advisory guidance for kelp products, and per-species iodine reference ranges for California kelps.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

high

process

guidance needed

Clostridium botulinum in reduced-oxygen and semi-dried packaged product

What covers it now

FDA reduced-oxygen packaging guidance written for other products

Who can close it

FDA; CDPH cannery/acidified food review

The gap

Vacuum-packed fresh or partially dried seaweed sits in a genuinely risky space, and operators packaging this way often do not know they need a validated barrier.

What would close it

Explicit seaweed guidance on reduced-oxygen packaging barriers (water activity, salt, acidification, refrigeration) and required plan elements.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

high

biosecurity

rulemaking needed

Seedstock health, pathogen transfer, and gear movement between sites

What covers it now

CDFW aquaculture disease and importation provisions written for finfish/shellfish

Who can close it

CDFW with USDA APHIS and NOAA

The gap

No seaweed pathogen list, no nursery health certification, no movement controls between water bodies, no genetic provenance requirement for cultivated strains.

What would close it

A seaweed health framework: reportable conditions, nursery certification, movement conditions, and provenance rules for outplanted strains.

California Ocean Protection Council (2026)National Sea Grant Law Center / Seaweed Food Safety Working Group (2021)

high

system

capacity needed

Laboratory and testing capacity

What covers it now

Commercial labs, operator-funded, no seaweed-validated methods

Who can close it

CDPH lab program; California Sea Grant; FDA method validation

The gap

Methods are not validated for a high-mineral, high-polysaccharide matrix; costs land entirely on small operators; turnaround exceeds shelf life for fresh product.

What would close it

Seaweed-validated methods, a recognized lab network, and cost-sharing for small operators.

National Sea Grant Law Center / Seaweed Food Safety Working Group (2021)Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

high

system

capacity needed

Operator training and PCQI/HACCP curriculum

What covers it now

Generic PCQI and seafood HACCP courses

Who can close it

California Sea Grant Extension

The gap

No seaweed-specific training exists in California. Operators pay for courses whose examples do not include a single seaweed hazard.

What would close it

A California Sea Grant seaweed food safety curriculum, recognized by CDPH, with a plan-writing workshop.

National Sea Grant Law Center / National Seaweed Hub (2023)Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

moderate

biological

guidance needed

Crustacean epibionts and allergen cross-contact

What covers it now

General allergen labeling; no seaweed determination

Who can close it

FDA CFSAN

The gap

No answer on whether attached crustaceans, bryozoans, and amphipods require an allergen advisory, and no washing/removal performance standard.

What would close it

An FDA position on epibiont allergens plus a washing efficacy standard.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)

moderate

physical

guidance needed

Physical hazards — sand, shell, gear fragments, microplastics

What covers it now

General CGMP

Who can close it

State guidance; industry SOP library

The gap

Wild intertidal harvest carries a much higher sand and shell load than any produce commodity; no removal standard exists.

What would close it

Washing and screening performance expectations for wild-harvest product.

Connecticut Sea Grant / CT Dept. of Agriculture Bureau of Aquaculture (2020)Kelpful (2020)

moderate

system

statute needed

Interstate recognition of California product

What covers it now

None. Buyer-by-buyer negotiation.

Who can close it

FDA with ISSC or a new seaweed conference; National Seaweed Hub

The gap

A California operator with a sound plan has no certificate a Massachusetts or Oregon buyer recognizes, because there is no interstate framework for seaweed.

What would close it

A national model ordinance or interstate agreement — the NSSP structure, adapted.

Interstate Shellfish Sanitation Conference / FDA (current)National Sea Grant Law Center / Seaweed Food Safety Working Group (2021)