Sturgeon
Sturgeons are a group of ancient fishes in the family Acipenseridae, with about 25 to 29 living species depending on the source.
Sturgeons are a group of ancient fishes in the family Acipenseridae, with about 25 to 29 living species depending on the source. They are native to temperate waters of the Northern Hemisphere and are known for their elongated bodies, cartilaginous skeletons, bony scutes, and four barbels near the mouth. Many species are long-lived, migratory, and heavily threatened by overfishing and habitat change.
Classification and evolution
Sturgeons are members of the family Acipenseridae and are considered an ancient group of fishes. Sources place their lineage at least 200 million years old, with a fossil record dating to the time of the dinosaurs.
Physical characteristics
Sturgeons typically have long bodies, a pointed snout, four barbels near the mouth, and rows of bony scutes that act as armour. Unlike most bony fishes, they have a largely cartilaginous skeleton.
Habitat and behaviour
Most sturgeon species live in rivers, lakes, estuaries, or coastal waters across the Northern Hemisphere. Many are anadromous and migrate into rivers to spawn in spring or summer, while some species remain in freshwater for life.
Human use and conservation
Sturgeon eggs are used to produce caviar, and some species are also fished for meat. Intensive harvesting, along with habitat loss and river modification, has left most species threatened, with many considered critically endangered.
Key facts
- Sturgeons belong to the family Acipenseridae and are an ancient lineage of bony fishes.
- They occur mainly in the Northern Hemisphere in temperate waters.
- Many species are anadromous, meaning they move between saltwater and freshwater to spawn.
- Sturgeons are identified by their elongated bodies, four barbels, and rows of bony scutes.
- Several species are harvested for caviar, and this has contributed to population declines.
- Most species are listed as critically endangered or otherwise under severe conservation pressure.
Sturgeon are important in Canada, especially lake sturgeon and white sturgeon, which occur in Canadian waters and have long been part of conservation and fisheries management efforts. Canadian readers may also encounter sturgeon in the Great Lakes, the Fraser River, and other major river systems.
Frequently asked questions
What is a sturgeon?
How many species of sturgeon are there?
Where do sturgeons live?
Do sturgeons migrate?
Why are sturgeons important?
Are sturgeons endangered?
References
- Encyclopaedia Britannica — https://www.britannica.com/animal/sturgeon-fishSupports: Family Acipenseridae, number of species, habitat, spawning behaviour, caviar use, and conservation status.
- Seattle Aquarium — https://www.seattleaquarium.org/animal/sturgeon/Supports: Physical traits, lifespan, habitat, and scutes/barbels description.
- U.S. Geological Survey — https://www.usgs.gov/gip/71/pdf/gip71.pdfSupports: Gulf sturgeon anatomy including scutes, cartilaginous skeleton, snout, mouth, and barbels.
- California Department of Fish and Wildlife — https://wildlife.ca.gov/Conservation/Fishes/SturgeonSupports: Ancient lineage, relation to paddlefish, and divergence at least 200 million years ago.
- The Nature Conservancy — https://www.nature.org/en-us/get-involved/how-to-help/animals-we-protect/lake-sturgeon/Supports: Lake sturgeon traits, Canadian occurrence, lifespan, and Canadian/U.S. conservation context.
- Britannica Kids — https://kids.britannica.com/kids/article/sturgeon/390157Supports: General description, habitat, size, and caviar/flesh uses.