Sturgeons are long-lived, late-maturing fishes with distinctive characteristics, such as a heterocercal caudal fin similar to those of sharks, and an elongated, spindle-like body that is smooth-skinned, scaleless, and armored with five lateral rows of bony plates called scutes.

There are 27 species of sturgeon, found in rivers and seas throughout the world, although many are now critically endangered. Sturgeon are typically characterized by their long, cylindrical bodies covered in bony plates known as scutes, which provide protection from predators.

4 days ago · Sturgeon, any of about 29 species of fishes of the family Acipenseridae (subclass Chondrostei), native to temperate waters of the Northern Hemisphere. Most species live in the ocean and ascend rivers to spawn in spring or summer; a few others are confined to fresh water.

May 23, 2022 · Guide to sturgeon fish species, types of sturgeon, common & endangered sturgeon and sturgeon fish identification.

Feb 28, 2025 · Sturgeons are an ancient group of bony fish characterized by their elongated, scaleless bodies, partially covered by rows of bony plates called scutes. They belong to the family Acipenseridae, within the order Acipenseriformes and the class Actinopterygii.

Across the many species, these fish have large, stout bodies and skin protected with several rows of bony plates. These plates, known as “scutes,” lie in rows across their scaleless skin. Their rostrum, or snout, protrudes distinctly outward and upward. Most …

May 27, 2024 · Sturgeons are ray-finned fish belonging to the class Actinopterygii, the order Acipenseriformes and the family Acipenseridae, which includes approximately 28 extant species and six extinct ones. Living species are found in four genera: Acipensar, Huso, Scaphirhynchus, and Pseudoscaphirhynchus.

Jan 31, 2019 · Sturgeon are one of the most ancient species of fish in the world. They are among the oldest remaining members of the bony fish group (Osteicthyes) with their evolution traceable to the early Triassic Period, nearly 250 million years ago.

Sturgeons are the most endangered species group on earth. These gentle giants have been around since the age of the dinosaurs, but are now on the brink of extinction due to overfishing, a flourishing illegal caviar trade and habitat loss. But we can still save sturgeons.

Fossil of the †chondrosteid †Strongylosteus hindenburgi, Tübingen Fossil of the †peipiaosteid †Yanosteus longidorsalis, MHNT The living polyodontid Polyodon spathula (American paddlefish) The living acipenserid Acipenser ruthenus (sterlet) The living acipenserid Pseudoscaphirhynchus kaufmanni (false shovelnose sturgeon). Acipenseriformes / æ s ɪ ˈ p ɛ n s ə r ɪ f ɔːr m iː z ...