Total number of mature individuals throughout their range is unknown. However, among coastal rivers of the Gulf of Mexico, the Suwannee River supports the most viable subpopulation, which was estimated at 7,650 adults. The subpopulation estimate for mature Gulf sturgeon in the Choctawhatchee River ranges from 1,700-3,000 fish; estimates in the Apalachicola, Pascagoula and Pearl rivers range between 50-350 fish.
(Office of Protected Resources, http://www.nmfs.noaa.gov/pr/species/fish/gulfsturgeon.htm and references cited)
Studies have consistently found Atlantic Sturgeon populations to be genetically diverse and indicate that there are between 7 and 10 populations that can be statistically differentiated. However, there is some disagreement among studies, and results do not include samples from all rivers inhabited by Atlantic sturgeon. There are only two Atlantic sturgeon populations for which size estimates are available - the Hudson River and the Altamaha River populations. In 1995, sampling crews on the Hudson River estimated that there were 9,500 juvenile Atlantic sturgeon in the estuary. Since 4,900 of these were stocked hatchery-raised fish, about 4,600 fish were thought to be of wild origin. The mean annual spawning stock size (spawning adults) was estimated at 870 (600 males and 270 females). The Altamaha River supports one of the healthiest Atlantic sturgeon populations in the Southeast, with over 2,000 subadults captured in research surveys in the past few years, 800 of which were 1 to 2 years of age. The population appears to be stable.
(Office of Protected Resources, http://www.nmfs.noaa.gov/pr/species/fish/atlanticsturgeon.htm)
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