White Sturgeon Caviar (Acipenser transmontanus)

A white sturgeon can live beyond 100 years. On Sacramento-area farms with warm water throughout the year, its roe may be harvested after 8 to 10 years. Those eggs become white sturgeon caviar through salting: the produce of Acipenser transmontanus, a large Pacific coast fish farmed in the United States and Italy.

The farm and the river tell very different stories. Wild populations have their own conservation and fishing rules, and permission to catch a fish is never the same as permission to harvest or sell its eggs.

White sturgeon at a glance

What white sturgeon caviar is known for

Compact, smooth and silky: that is how Calvisius describes its white sturgeon Tradition Prestige selection, with fruit, soft nuts and gentle marine salinity. Its Elite description adds seaweed and deeper umami, or savouriness. These are descriptions of particular producer selections, rather than findings from a comparative tasting or a flavour profile shared by every tin.

The eggs have a relatively generous reference diameter. University of Florida aquaculture guidance gives 3.2 to 4.0 mm, but that measurement concerns reproductive management. Producers grade finished caviar into their own selections, so the aquaculture range and the finished-caviar grades serve different purposes.

“White” names the fish, not a pale grade of roe. Dark grey and black predominate in the producer descriptions cited here, with amber tones in some selections. Colour does not reveal whether a tin was produced in North America or Europe.

Compact, smooth and silky: that is how Calvisius describes its white sturgeon Tradition Prestige selection, with fruit, soft nuts and gentle marine salinity.

For a closer species comparison, read white sturgeon versus Ossetra. Neither bead size nor a tasting adjective establishes species identity.

The fish behind the roe

White sturgeon belongs to Acipenseridae, the family of true sturgeons. Its principal North American strongholds are the Sacramento and San Joaquin system in California, the Columbia system including the Snake River, and the Fraser system in British Columbia. The Nechako and Kootenay systems are also central to its Canadian conservation story.

Its coastal range reaches beyond those spawning rivers. Some fish move between fresh and salt water; others inhabit inland river reaches separated by barriers. These different lives help explain why white sturgeon cannot be managed as one interchangeable stock.

Longevity is one of the species' striking qualities. UC Davis notes that white sturgeon can live beyond 100 years, while California's wildlife authority reports that fish exceeding 2 m are now rarely encountered in Californian waters. Even a population containing very large adults can be in difficulty if few young fish survive.

The CITES name is Acipenser transmontanus. A proposed alternative, Sinosturio transmontanus, appeared in 2025. The Catalog of Fishes records that proposal but currently retains Acipenser transmontanus as valid, the name used throughout this article.

Where it is farmed, and when females yield roe

California and Italy both have documented white sturgeon production. UC Davis records farming in Sacramento County, including the Wilton farm discussed in its May 2025 account. Visit Brescia, the local tourism authority, documents production at Calvisano in Italy.

The farm matters more than the nationality suggested by a brand. A Californian name does not establish Californian roe, and a business offering several species may source them from different farms.

Time to harvest depends on how and where the fish are raised. A 2015 farm information sheet hosted by California's aquaculture programme gives 8 to 10 years for Sacramento-area farms, where water stays warm throughout the year. UC Davis's 2025 account describes female maturation at seven to eight years.

Maturity and harvest are different milestones. Temperature, husbandry and ovarian development all shape the production cycle, and producers can hold females beyond first maturity to meet their roe specifications. A farm-specific harvest age is therefore a useful guide to production under those conditions, rather than a fixed timetable for the species.

Why wild populations receive different protection

The future of a river population depends on young fish surviving, not simply on adults remaining. Recruitment is the addition of young fish to a population. Fisheries authorities describe persistent failures of young sturgeon to survive in several regulated rivers: recruitment failures. Protecting adults, restoring suitable flows and habitats, and conservation hatchery work tackle different parts of this problem.

The IUCN assessment published in 2022 classifies white sturgeon globally as Vulnerable. That describes extinction risk; fishing permissions and the legal status of individual river populations are separate matters.

According to the federal listing rule, Endangered Species Act protection for the Kootenai River population took effect on 6 October 1994. That listing applies to this population, rather than every white sturgeon in California, Oregon or Washington. It is also distinct from the federal protection of green sturgeon.

Canada's 2024 action plan identifies four populations listed as Endangered under the Species at Risk Act in 2006: Upper Fraser River, Nechako River, Upper Columbia River and Kootenay River. A footnote explains that the last was renamed Upper Kootenay River population in 2019. Lower and Middle Fraser populations are not among those four listings.

Wild harvest and roe sale: the rules are local

An open fishery does not automatically mean a lawful source of caviar. Recreational retention, commercial fishing and roe sale each have their own rules. The summary below concerns ordinary recreational and commercial supply, rather than determining Indigenous or treaty fishing rights. All entries were checked in November 2026.

A claim of “wild white sturgeon caviar” therefore needs a precise account of its origin and permissions: the river, the lawful fishery, authority to retain the fish and authority to sell the eggs. A sporting catch photograph or an old fishing regulation supplies none of those permissions.

CITES, origin and international movements

Start with the label, then check the rules for the journey. White sturgeon is an Appendix II species, identified by the CITES species code TRA. Resolution Conf. 12.7 (Rev. CoP17) sets out the universal caviar labelling system in Annex 1 and the species codes in Annex 2. National fishing permissions and food-import requirements remain separate.

On repacked caviar, the country where the roe originated and the country where it was repacked are different pieces of information. The label provides traceability, rather than laboratory confirmation of the contents. TRA is the species code; by itself, it establishes neither the farm nor the taste, and cannot validate an unsupported claim of lawful wild origin.

EU Regulation (EC) No 865/2006 provides for non-reusable labels on individual primary caviar containers. Consult the law hub for the EU, UK, US, Switzerland, UAE, China, Japan, Russia and Australia, then confirm the applicable wildlife and food import requirements with the destination authorities.

For travellers, the important figure is up to 125 g per person. CITES recommends an exemption at that level for Appendix II caviar in individually marked containers carrying CITES labels. It applies only where national law allows it: Appendix II status does not create an automatic personal allowance or override import bans and biosecurity rules. Check the requirements for the entire route with the relevant authorities before travelling.

Where to go next

• Sturgeon Species: compare the main caviar-producing fish and distinguish trade names from biological identities.