Atlantic Sturgeon (Acipenser oxyrinchus)

Atlantic sturgeon is a large, migratory fish whose roe helped fuel North America's nineteenth-century caviar industry. Its present story differs by country: US harvest is subject to a moratorium, Canadian policy recognises a restricted commercial fishery, and European programmes are rebuilding lost populations.

Species fact box

Which fish is the Atlantic sturgeon?

The name in this article is Acipenser oxyrinchus, the Atlantic-coast fish. Traditionally, authorities divided the species into the Atlantic form, Acipenser oxyrinchus oxyrinchus, and the Gulf form, Acipenser oxyrinchus desotoi. The latter belongs to the Gulf of Mexico and has a separate conservation history, covered in the Gulf sturgeon.

That two-subspecies arrangement is no longer universal. At their October 2025 workshop, the IUCN Sturgeon Specialist Group and World Sturgeon Conservation Society supported recognising Acipenser oxyrinchus and Acipenser desotoi as distinct taxa, while rejecting broader proposed genus changes. US wildlife agencies still use the Gulf subspecies name, so an updated biological classification and a legal listing may use different names for the same fish.

For comparisons with other fish in the family, start with the sturgeon species guide. Here, Atlantic sturgeon does not mean the European sturgeon, Acipenser sturio, despite the confusing overlap in older common names.

A life between rivers and sea

Atlantic sturgeon are anadromous: they hatch in fresh water, move into estuaries and coastal seas, and return to rivers to reproduce. NOAA describes their North American range as Canada to Florida. The spawning river matters because fish from different populations can mix at sea without belonging to one interchangeable breeding population.

According to NOAA, Atlantic sturgeon in the Saint Lawrence population mature at 22 to 34 years old, leaving a long interval between protecting young fish and seeing them contribute eggs.

COSEWIC's Canadian assessment describes mature females at about 2 to 3 m long and 100 to 200 kg, with mature males smaller, at about 1.4 to 2.1 m and 50 to 100 kg. These are reported adult ranges, not identification limits or maximum records. NOAA reports a lifespan reaching 60 years.

Such longevity does not mean rapid recovery. According to NOAA, Atlantic sturgeon in the Saint Lawrence population mature at 22 to 34 years old, leaving a long interval between protecting young fish and seeing them contribute eggs. Wild maturity must not be substituted for a documented first harvest age on a farm.

How to recognise it

Look for a long, pointed snout, four barbels beneath it and five rows of bony plates called scutes. The back is dark, often bluish-black or olive-brown, with paler sides and a white underside. These features describe the fish, not a way to authenticate its roe.

Atlantic sturgeon can be confused with shortnose sturgeon. COSEWIC distinguishes them using the Atlantic fish's longer, more V-shaped snout and differences in the plates near the tail; overall size alone is insufficient when comparing young fish. Reliable identification uses several features together.

Its place in the caviar boom

Roe means fish eggs, and Atlantic sturgeon roe became part of an intensive commercial industry on North America's Atlantic coast. NOAA's historical account links the species' decline to heavy exploitation for caviar as well as habitat loss. Its bibliography describes a sharp collapse in recorded catches between the late nineteenth and early twentieth centuries.

The important biological point is that removing mature females also removes future spawning opportunities from a slow-maturing population. A fishery can exhaust that reproductive reserve much faster than young fish can replace it.

United States: the moratorium and ESA listings

The Atlantic States Marine Fisheries Commission introduced its coastwide harvest moratorium in 1998. This fisheries-management measure predates the Endangered Species Act listings and is not simply another name for them. The Commission describes rebuilding as a process requiring many surviving year classes, not a short closure followed by automatic reopening.

In 2012, NOAA listed five distinct population segments, or DPSs, under the ESA. A DPS is a legally recognised population unit, not a separate species. Their statuses remain distinct:

The 2024 stock assessment update offers some encouragement: coastwide abundance likely increased after 1998, but results differed among DPSs. That finding does not establish that every river has recovered, and it has not reopened US harvest. Continuing pressures include incidental capture in other fisheries, barriers to migration and vessel strikes.

Canada: a separate, restricted fishery

Canada must not be folded into the US prohibition. The relevant Canadian framework includes the Fisheries Act and Maritime Provinces Fishery Regulations. DFO's Maritimes licensing policy, updated in February 2026, still recognises a commercial Atlantic sturgeon fishery in the tidal Saint John River in Kings County, New Brunswick. It describes closed entry: no new or replacement licences are issued, authorised gear is gill nets, June is closed, and licences expire on the holder's death.

Those are published policy terms, not a substitute for an individual licence's current conditions or any applicable closure orders. This is a specifically regulated fishery, not general permission to harvest Atlantic sturgeon throughout Canada.

COSEWIC assessed both the Saint Lawrence and Maritimes populations as Threatened in 2011. COSEWIC supplies the scientific assessment; listing under Schedule 1 of Canada's Species at Risk Act is a separate government decision. The two are not interchangeable conservation labels. As of November 2026, neither population is listed in Schedule 1.

Europe: ancient populations and modern restoration

Genetics changed the Baltic story. Ludwig and colleagues' 2002 study used genetic, morphological and archaeological evidence to identify a North American connection in historical Baltic sturgeon. This overturned the assumption that restoring the Baltic simply meant returning Acipenser sturio.

The timing was subsequently revised. Popović and colleagues analysed 125 ancient Baltic specimens in their 2014 study, sequencing mitochondrial DNA fragments and examining eight microsatellite markers, short repeated DNA sequences used to compare populations. Only four specimens were identified as Acipenser sturio; the remainder were Atlantic sturgeon. Their analysis supported Atlantic sturgeon's dominance for at least 2,000 years and estimated entry into the Baltic around 4,000 to 5,000 years ago.

European history also extends beyond the Baltic: a 2026 palaeoecological paper reviews evidence of former Atlantic sturgeon populations along the French Atlantic coast. Present restoration geography is more specific. German programmes distinguish Baltic restoration using Acipenser oxyrinchus from North Sea restoration using Acipenser sturio.

Germany's Federal Agency for Nature Conservation explains that the Habitats Directive's older use of Acipenser sturio encompasses the two species recognised today in those respective regions. According to the European Commission’s 2014 interpretation, Baltic Atlantic sturgeon receive the Directive’s protection under that name. That legal naming history should not obscure their biological distinction. HELCOM's Baltic action plan addresses restoring migration routes, spawning habitat and populations, rather than a return to commercial caviar harvest.

Releasing juveniles is a means towards recovery, not proof that a self-sustaining population has returned.

Is Atlantic sturgeon roe harvested today?

According to Acadian, its wild Atlantic sturgeon caviar comes from the Saint John River fishery, separately from its farming operations. Canada's CITES export quota for wild Saint John River caviar was zero for 2023 to 2025. Acadian's own product information identifies its wild Atlantic sturgeon as Saint John River fish and its land-based farmed caviar as shortnose sturgeon.

Atlantic sturgeon husbandry is documented in Canada: a National Research Council grant record describes selective breeding work involving Atlantic and shortnose sturgeon. Raising broodstock or juveniles, however, does not demonstrate a completed commercial roe harvest. According to the NRC grant record, Canadian work includes broodstock selection, selective breeding and juvenile rearing.