About the Species
Shortnose sturgeon live in rivers and coastal waters from Canada to Florida. They hatch in the freshwater of rivers and spend most of their time in the estuaries of these rivers. Unlike Atlantic sturgeon, shortnose sturgeon tend to spend relatively little time in the ocean. When they do enter marine waters, they generally stay close to shore. In the spring, adults move far upstream and away from saltwater, to spawn. After spawning, the adults move rapidly back downstream to the estuaries, where they feed, rest, and spend most of their time.
Shortnose sturgeon have five rows of bony plates known as scutes. This unique fish looks like it is covered in armor. Shortnose sturgeon are slow-growing and late-maturing, and they have been recorded to reach up to 4.5 feet in length and live 30 years or more.
Native American fishermen harvested shortnose and Atlantic sturgeon for their meat and eggs (roe) some 4,000 years ago, and sturgeon are credited as the primary food source that saved the Jamestown settlers in 1607. In the mid-1800s, Atlantic and shortnose sturgeon began to support a thriving and profitable fishery for caviar, smoked meat, and oil. For the most part, historical landings records failed to differentiate between shortnose sturgeon and the larger Atlantic sturgeon, making it difficult to determine historical trends in abundance for populations of either species difficult to determine. By the late-1800s, sturgeon were being over-exploited. In 1890, over 7 million pounds of sturgeon were caught in 1 year alone. In 1920, only 23,000 pounds of sturgeon were caught.
Although shortnose sturgeon are no longer fished, threats remain that continue to affect recovery efforts. Bycatch in commercial fisheries and increased industrial uses (e.g., hydropower, nuclear power, treated sewage disposal) of the nation’s large coastal rivers during the 20th century became the primary barriers to shortnose sturgeon recovery.
Today, the shortnose sturgeon is in danger of extinction throughout its range and is listed as endangered under the Endangered Species Act. The primary threats to this species are habitat degradation, water pollution, dredging, water withdrawals, fisheries bycatch, and habitat impediments (e.g., dams).
NOAA Fisheries and its partners are dedicated to conserving and rebuilding shortnose sturgeon populations along the East Coast. We use a variety of innovative techniques to study, protect, and recover these endangered fish. Working closely with our partners, we develop regulations and management plans that preserve and restore sturgeon habitat, monitor bycatch, and promote population recovery.
Historically, shortnose sturgeon were found in the coastal rivers along the East Coast of North America—from the Saint John River in New Brunswick, Canada, to the St. Johns River in Florida, and perhaps as far south as the Indian River in Florida. Currently, shortnose sturgeon can be found in 41 bays and rivers along the East Coast, but their distribution across this range is broken up, with a large gap of about 250 miles separating the northern and mid-Atlantic metapopulations from the southern metapopulation. Because of this distance between the shortnose sturgeon in mid-Atlantic/northern metapopulations and the southern metapopulation, adults from the two areas may never meet to breed.
In the southern metapopulation, shortnose sturgeon are currently found in the Great Pee Dee, Waccamaw, Edisto, Cooper, Santee, Altamaha, Ogeechee, and Savannah rivers. They may also be found in the Black, Sampit, Ashley, Roanoke, and Cape Fear rivers, as well as Albemarle Sound and Pamlico Sound. Shortnose sturgeon used to be considered extinct in the Satilla, St. Marys, and the St. Johns rivers, but were recently found again in both the Satilla and St. Marys rivers. A single specimen was found in the St. Johns River by the Florida Fish and Wildlife Conservation Commission during extensive sampling of the river in 2002 and 2003.
In the northern and mid-Atlantic metapopulations, shortnose sturgeon are currently found in the Saint John (Canada), Penobscot, Kennebec, Androscoggin, Piscataqua, Merrimack, Connecticut, Hudson, Delaware, and Potomac rivers. They have also been frequently spotted opportunistically foraging and transiting in the St. George, Medomak, Damariscotta, Sheepscot, Saco, Deerfield, East, and Susquehanna rivers. On rare occassions, they have been seen in the Narraguagus, Presumpscot, Westfield, Housatonic, Schuylkill, Rappahannock, and James rivers.
There are also two dam-locked populations of shortnose sturgeon that have been trapped upstream of these dams since their construction. Populations can be found above the Holyoke Dam on the Connecticut River, and the Pinopolis, Wilson, and St. Stephens dams on the Santee and Cooper rivers in South Carolina. Shortnose sturgeon can also be found trapped above the dams on the Santee-Cooper system in Lake Moultrie and Lake Marion, as well as the Congaree and Wateree rivers.
The historical range of shortnose sturgeon included major estuaries (areas where rivers meet the sea) and river systems from Canada to Florida. No estimate of the historical population size of shortnose sturgeon is available. While the shortnose sturgeon were rarely the target of a commercial fishery, they were often was taken incidentally in the commercial fishery for Atlantic sturgeon. In the 1950s, sturgeon fisheries declined on the East Coast, which resulted in a lack of records of shortnose sturgeon. This led the Fish and Wildlife Service to conclude that the fish had been eliminated from the rivers in its historic range (except the Hudson River) and was in danger of extinction because of pollution and overfishing, both directly and incidentally.
Currently, shortnose sturgeon are found in 41 rivers and bays along the East Coast, spawning in 19 of those rivers and comprising three “metapopulations,” or reproductively isolated groups. These three metapopulations include the Carolinian Province (southern metapopulation), Virginian Province (mid-Atlantic metapopulation), and Acadian Province (northern metapopulation).
- Throughout Its Range
CITES Appendix I
- Throughout Its Range
Shortnose sturgeon can grow to approximately 4.5 feet long and weigh up to 60 pounds. They are yellowish-brown and generally have a black head, back, and sides. Their bellies are white to yellow. They have five major rows of scutes and a protruding snout with four barbels (fleshy, whisker-like projections).
Shortnose sturgeon are similar in appearance to Atlantic sturgeon, but can be distinguished by their smaller size, larger mouth, smaller snout shape, and tail scute pattern.
Behavior and Diet
Spawning adults generally migrate upriver in spring, from January to April in the South, April to May in the Mid-Atlantic, and May to June in Canadian waters. After spawning, the adults typically move quickly back downstream to the lower river and estuaries. Juveniles move downstream and live in brackish waters for a few months.
Shortnose sturgeon use their four barbels to search for food in the sandy, muddy bottom of rivers. They use a vacuum-like mouth to suck up this bottom-dwelling food, typically eating invertebrates such as insects, crustaceans, worms, and mollusks.
Where They Live
Historically, shortnose sturgeon were found in the coastal rivers along the East Coast of North America from the Saint John River, New Brunswick, Canada, to the St. Johns River, Florida, and perhaps as far south as the Indian River in Florida. Currently, shortnose sturgeon occur in 41 bays and rivers along the East Coast, reproducing in 19 of them.
For the most part, shortnose sturgeon are amphidromous fish—meaning they are born in freshwater, then live in their birth (natal) river, make short feeding or migratory trips into salt water, and then return to freshwater to feed and escape predation. All sturgeon, including shortnose sturgeon, spawn in freshwater.
Lifespan & Reproduction
Lifespan is correlated with how far north or south shortnose sturgeon live, with adults reaching up to 60 years in Canada, but likely only 10 to 20 years in the Southeast. Southern populations tend to grow faster and reach sexual maturity at an earlier age than other populations. For example, shortnose sturgeon mature in South Carolina and Georgia rivers around 2 to 5 years of age, in the Hudson River at 7 to 10 years, and in the St. Johns River (Canada) at 12 to 18 years.
Male shortnose sturgeon usually spawn every 1 to 2 years once they mature, while females spawn every 3 to 5 years. The number of eggs females can produce is correlated with age and body size and ranges from 30,000 to 200,000 per year.
The most significant threats to the species are dams that block access to spawning areas or lower parts of rivers, poor water quality, dredging, water withdrawals from rivers, and unintended catch in some commercial fisheries.
Locks and dams on the Cape Fear River, North Carolina, and Santee-Cooper River, South Carolina; Savannah River, South Carolina/Georgia; and the Connecticut River impede access to upstream spawning habitat. The dams on the Santee-Cooper system also prevent shortnose sturgeon from traveling downstream, below the dams, to areas with better food sources.
For the past several years, NOAA Fisheries has been working with Holyoke Gas and Electric to improve fish passage on the Holyoke Dam on the Connecticut River. In 2017, the station opened a modified fishway, which consists of two “lifts” that carry migrating fish up and over the dam. For the first time in 20 years, shortnose sturgeon passed upstream of the dam. So far, 85 shortnose sturgeon have been counted at the fishway in 2017. In 2018, 91 shortnose sturgeon were counted at the fishway.
Habitats can be disrupted or lost because of various human activities, such as dredging, dams, water withdrawals, saltwater intrusion (often caused by groundwater pumping from freshwater wells or dredging), chemical contamination of sediments in rearing areas, and other development.
Fisheries Interactions and Bycatch
Fisherman sometimes accidentally capture shortnose sturgeon while trying to catch something else. This is called bycatch and occurs primarily in gillnet fisheries; however, shortnose sturgeon have also been captured in pound nets, fyke/hoop nets, catfish pots, shrimp trawls, and even recreational hooks and lines.
The prevalence and likelihood of bycatch varies by time of year. Time of year also impacts the likelihood of the sturgeon’s survival (i.e., survival is more likely in colder water) and influences the life stages that are caught. Fisheries conducted within rivers and estuaries may intercept any life stage, while fisheries conducted in the nearshore and ocean are more likely to capture migrating adults. The likelihood that an accidentally caught shortnose sturgeon will die in a gillnet appears to be related to water quality, how the net is set, and how long the net is left before being tended. Overall, gillnets not tethered to anything (“drift gillnets”) have lower capture rates than those attached to the bottom. The longer a net is in the water the greater the chance a captured shortnose sturgeon will die, and death is more likely when waters are warm.
The historical range of shortnose sturgeon included major estuaries and river systems from Canada to Florida. Currently, shortnose sturgeon are found in 41 rivers and bays along the East Coast. They comprise three “metapopulations,” or genetically similar groups, suggesting that more interbreeding occurs in rivers within these metapopulations rather than between them. These three metapopulations include the Carolinian Province (southern metapopulation), Virginian Province (mid-Atlantic metapopulation), and Acadian Province (northern metapopulation). Each group constitutes important genetic diversity.
The current status of shortnose sturgeon in the southern metapopulation depends on the river in which they live. Overall, populations within the southern metapopulation are relatively small compared to their northern counterparts. The Altamaha and Savannah rivers support the largest known shortnose sturgeon population in the Southeast. Total population estimates for the Altamaha River ranged from 468 fish (1993) to over 5,550 fish (2006), with estimates in the Savannah River ranging from 1,390 (2009) to 2,432 (2013).
Abundance estimates indicate the shortnose sturgeon population in the Ogeechee River is considerably smaller, with the highest estimate of the total population being 404 individuals (2007). Since 2007, sampling in this river suggests the population might be declining.
Spawning is also occurring in the Cooper, Congaree, and Yadkin-Pee Dee rivers. While active spawning is occurring in South Carolina’s Winyah Bay complex (Black, Sampit, Yadkin-Pee Dee, and Waccamaw rivers) the population status there is unknown. The most recent estimate for the Cooper River suggests a population of approximately 220 spawning adults. The status of the other riverine populations within the southern metapopulation is currently unknown.
Northern and Mid-Atlantic Metapopulations
The population estimates of shortnose sturgeon in the northern and mid-Atlantic metapopulations vary by river. The Hudson, Saint John (New Brunswick, Canada), and Delaware rivers support the largest known shortnose sturgeon populations in the Northeast and Mid-Atlantic. Total population estimates ranged from 5,837 fish (1979) to 80,026 (1995) for the Hudson River, and from 18,179 (2013) to 20,798 (2015) adults for the Saint John River. Estimates in the Delaware River are at approximately 12,047 adults (2006). Available data suggests that the Hudson population has increased over the past several decades, and the Saint John and Delaware populations may be stable.
One of the smaller populations in these regions is in the Merrimack River. The highest estimate of adults was 2,000 individuals (2009). This is significantly higher than the estimate 20 years before (32 adults), but telemetry studies have shown that most of these adults return to spawn in the Kennebec River.
Spawning is also occurs in the Saint John (Canada), Androscoggin, Kennebec, and Connecticut rivers, and it may occur in the Potomac River. The most recent population estimate for the Saint John River was 18,000 adults (1979). The Kennebec System has an estimated population size of 9,488 adults (2003). For the Connecticut River, the downstream segment (below Holyoke Dam) was estimated to have 1,600 adults (2004), and the upstream segment (above Holyoke Dam) was estimated to have 328 adults (2012). The population estimate for the Potomac River is currently unknown because few shortnose sturgeon have been captured there since they were listed under the Endangered Species Act. Telemetry studies suggest these fish might have moved through the Chesapeake Delaware Canal and spawned in the Delaware River.
Shortnose sturgeon are protected under the Endangered Species Act and listed as endangered throughout their range. This means that the shortnose sturgeon is in danger of extinction throughout all or a significant portion of its range. NOAA Fisheries is working to protect this species in many ways, with the goal that populations will recover.
Recovery Planning and Implementation
In 1998, NOAA Fisheries approved the shortnose sturgeon recovery plan for publication. The Shortnose Sturgeon Recovery Team drafted the plan, with a recovery goal to delist shortnose sturgeon populations throughout their range. The recovery plan also defined a recovery objective and criteria for measuring progress. Specifically, it sought to recover shortnose sturgeon populations to levels of abundance at which they no longer require protection under the ESA. For each population segment, the minimum population size will be large enough to maintain genetic diversity and avoid extinction.
The plan also established four broad recovery actions: 1) establish listing criteria for shortnose sturgeon population segments, 2) protect shortnose sturgeon and their habitats, 3) rehabilitate shortnose sturgeon populations and habitats, and 4) implement recovery tasks. These broader actions also specify several more specific sub-actions.
NOAA Fisheries has completed some of the actions described in the 1998 recovery plan and continues to implement others. These range from improving our understanding of shortnose sturgeon genetics, to reducing bycatch in fisheries by researching ways bycatch occurs and what factors make interactions more deadly. We are also working, along with our partners, to reduce man-made impacts in many ways, such as understanding how pollution affects shortnose sturgeon, or investigating ways for shortnose sturgeon to get around man-made barriers. Along with our partners, we are restoring degraded shortnose sturgeon habitat.
Restoring Habitat and Fish Passage
Sturgeon and other migrating fish, such as salmon, shad, and alewives, need access to freshwater habitat for spawning and rearing. In some cases, shortnose sturgeon need to swim long distances to reach their destination, but man-made barriers such as dams may block them from completing their journey. These barriers have had serious impacts on shortnose sturgeon spawning runs, particularly in the Southeast, and their habitats along the entire East Coast. Removing outdated dams can greatly improve shortnose sturgeon access to their historical habitats. NOAA Fisheries works with conservation organizations, energy companies, states, tribes, and citizens to evaluate barriers—big and small—to improving fish passage. Most barriers have the same general impact on fish (blocking migrations), but each requires a specific set of conservation actions.
Providing Captive Breeding Programs
Some shortnose sturgeon are bred in captivity, held in accordance with specific permits, and housed at research facilities. These captive-bred animals can provide important insight into the physical, chemical, and biological parameters necessary for the optimal growth, survival, and reproduction of shortnose sturgeon in the wild. Captive-bred animals are also used in permanent educational displays that promote public awareness of the plight of the species.
Educating the Public
We believe that one of the best ways to help save this amazing species is by getting the word out through outreach. Our scientists are working with students and teachers to learn more about the movements, behavior, and threats to Atlantic and shortnose sturgeons along the East Coast. The SCUTES program—Students Collaborating to Undertake Tracking Efforts for Sturgeon—provides lesson plans, educational kits, and an opportunity for classrooms to adopt a tagged sturgeon.
The Convention on International Trade in Endangered Species of Wild Fauna and Flora protects shortnose sturgeon and other sturgeons by regulating international trade in listed species of plants and animals.
The U.S. Fish and Wildlife Service originally listed shortnose sturgeon as an endangered species on March 11, 1967, under the Endangered Species Preservation Act, the precursor to the ESA. NOAA Fisheries assumed jurisdiction for shortnose sturgeon from the USFWS under a 1974 government reorganization plan. The ESA was enacted in 1973 and all species that were listed as endangered in the 1969 Endangered Species Conservation Act were deemed endangered under the ESA. Shortnose sturgeon currently remain listed as endangered throughout their range along the U.S. East Coast.
Although the original listing notice did not cite reasons for listing shortnose sturgeon, a 1973 U.S. Department of Interior resource publication stated that the species was “in peril ... gone in most of the rivers of its former range [but] probably not as yet extinct." Pollution and overfishing, including bycatch in the shad fishery, were listed as principal reasons for the species' decline.
Regulatory Actions & Documents
NOAA Fisheries conducts various research activities on the biology, behavior, and ecology of shortnose sturgeon. The results of this research are used to inform management decisions and enhance recovery efforts for endangered shortnose sturgeon populations.
Tagging and Tracking
Scientists use various tagging techniques to learn about the migration patterns of shortnose sturgeon and identify important juvenile habitats. They generally used are T-bar, passive integrated transponder, radio, satellite, pop off, and acoustic tags (tags detected using sound). T-bar, dart, and PIT tags allow other researchers to identify an individual fish when it is captured. Acoustic and satellite telemetry tags (tags using radios to locate) let researchers learn where shortnose sturgeon travel, at what depths, and at what speeds.
Shortnose sturgeon researchers take small fin clips from every sturgeon they catch to better understand the genetic composition of all populations. In 2010, geneticists determined that all shortnose sturgeon can be identified as belonging to one of three groups, called metapopulations. Shortnose sturgeon that are accidentally captured or killed can be identified to one of these metapopulation using information in their DNA (genotype). By comparing the differences in the DNA of animals within a population, researchers can work backward to determine how many genetically different spawning adults would be needed to create that amount of genetic difference. All this information helps us learn more about where animals come from and their family history. NOAA Fisheries, in cooperation with the U.S. Geological Survey, has been maintaining stored tissue and DNA samples and records of shortnose sturgeon, as well as Atlantic sturgeon.
Side Scan Sonar
Recently, researchers and managers have used a type of sonar known as side scan sonar to estimate the number of sturgeon that appear on the sonar image. While promising, this approach is still being perfected. Most rivers are wide enough that multiple passes are needed to cover the entire width. Likewise, most rivers are so long that sampling the entire river is not possible. Therefore, an equation to account for unsampled areas and fish counted multiple times is needed to correct the estimate. Additionally because shortnose sturgeon are smaller than other sturgeon species, their images can sometimes be hard to differentiate from large gar, catfish, or juvenile Atlantic sturgeon. As a result, researchers and managers will need to refine this approach to make sure they accurately detect shortnose sturgeon.
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