California Sea Grant
Where California seaweed seed comes from — and what it would take to certify it
Shellfish growers can buy certified seed. Seaweed growers cannot. This is the public record of every California seed source we can document, what is actually available this season, and the pathway to a certification program that does not exist yet.
Draft standard. Not yet a regulatory program. Published for comment.
- Documented seed sources
- 10
- Species in culture
- 6
- Offerings open to growers
- 2
- Certified seed banks
- 0
With a cited source and date
Kelps and red and green algae
Everything else is in-house or research
The program does not exist yet
What is available right now
A first pass at the availability matrix, by species and seed form. Every row carries a source.
| Species | Seed forms documented | Best current status |
|---|---|---|
| Bull kelpNereocystis luetkeana | gametophyte culture, seeded twine, outplanting stock, preserved spores | Seasonal |
| Giant kelpMacrocystis pyrifera | seeded line | Not available in CA |
| Winged kelpAlaria marginata | gametophyte culture | Research only |
| Sea lettuceUlva spp. | hatchery nursery stock, tank culture stock, research culture stock | Available now |
| DulseDevaleraea / Palmaria spp. | tank culture stock | Not available in CA |
| OgoGracilaria spp. | tank culture stock | Not available in CA |
A four-tier standard, drafted to be audited
Tiers a hatchery can self-assess against today, ending in certification an agency could point to.
Tier 1
Registered Source
A seed source that is who it says it is, holds the permits it needs, and publishes what it produces.
Tier 2
Traceable Seed
Every batch of seed can be traced back to a specific wild collection event and forward to the farm that received it.
Tier 3
Biosecure Hatchery
The hatchery is run so that pests, epiphytes, and pathogens are not moved between water bodies along with the seed.
Tier 4
Certified Seed Bank
Independently audited, genetically documented, health-screened seed a grower or an agency can rely on without asking further questions.
What is missing
The gap register names what does not exist, and who could close it.
Standards
No seed certification standard exists
There is no standard, no certificate, and no list a grower or an agency can check before seed moves.
Biosecurity
No pathogen or pest screening requirement for seaweed seed
No listed pathogens, no required inspection point, no method, and no laboratory designated to run it.
The pathway
From writing down what exists to rules that bind where they must.
- Phase 0Write down what existsNow
A public, dated picture of every California seaweed seed source, what species and forms they produce, and what the rules actually say.
- Phase 1Voluntary standard6–12 months
A four-tier standard that a hatchery can self-assess against today, with criteria specific enough to audit.
- Phase 2Third-party audit and certification12–24 months
Certification that means something because someone independent checked.
- Phase 3Agency recognition2–3 years
Agencies point to the standard instead of writing a parallel one.
- Phase 4Rule or statute where it is warranted3–5 years
The parts that must be mandatory — health screening before seed crosses a water body — become enforceable.