Also found in: Dictionary, Thesaurus, Wikipedia.


primitive fish of the northern regions of Europe, Asia, and North America. Unlike evolutionarily advanced fishes, it has a fine-grained hide, with very reduced scalation, a mostly cartilaginous skeleton, upturned tail fins, and a mouth set well back on the underside of the head. It also has widely separated rows of heavy guard scales, four barbels or feelers that hang below the head and help to locate food, and a gas bladder from which isinglass is made. Sturgeons feed by sucking in their food—e.g., crayfish, snails, larvae, and small fishes—from the water bottom through their small, toothless, fleshy-lipped mouths.

Some species are marine, e.g., the Atlantic and Gulf sturgeons Acipenser oxyrhyncus; some ascend rivers to spawn; and some (the largest of inland fish) are found in landlocked waters. The largest species is the beluga (A. huso or Huso huso), of the Caspian and Black seas; it reaches a length of 13 ft (396 cm) and a weight of up to a ton (900 kg). The white, or Pacific, sturgeon (A. transmontanus) may weigh over half a ton (450 kg) and attain a length of 12 ft (366 cm). The green sturgeon is a smaller Pacific variety, and the European sea, or common, sturgeon is found in coastal waters and rivers of Europe and E North America. Other American species are the lake, or rock, sturgeon (A. fulvescens) of the Great Lakes and the Mississippi valley, the shovelnose sturgeon, or hackleback (Scaphirhynchus platorynchus; 3 ft/91 cm), of the Mississippi valley, and the pallid sturgeon (S. albus), of the Missouri and Mississippi valleys, an endangered species.

Smoked sturgeon is considered a delicacy in many areas, and sturgeon eggs are the source of the better grades of caviarcaviar
or caviare
, the roe (eggs) of various species of sturgeon prepared as a piquant table delicacy. The ovaries of the fish are beaten to loosen the eggs, which are then freed from fat and membrane by being passed through a sieve.
..... Click the link for more information.
, sometimes in combination with eggs of the paddlefishpaddlefish,
large freshwater fish, Polyodon spathula, of the Mississippi valley, also called spoonbill or duckbill and named for its flattened, paddle-shaped snout. The largest specimens weigh well over 150 lb (67.5 kg) and reach 6 ft (183 cm) in length.
..... Click the link for more information.
, a close relative. Russia, Iran, and other countries surrounding the Caspian Sea have undertaken conservation measures, including aquaculture and setting catch quotas, to save the threatened Russian sturgeon from extinction, but declines in Eurasian species of sturgeon have led to several suspensions of the international trade in wild caviar from the region since 2001. Sturgeon are also raised on fish farms in a number nations outside the Caspian basin.

Sturgeons are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
..... Click the link for more information.
, subphylum Vertebrata, class Actinopterygii, order Acipenseriformes, family Acipenseridae.


(vertebrate zoology)
Any of 10 species of large bottom-living fish which comprise the family Acipenseridae; the body has five rows of bony plates, and the snout is elongate with four barbels on its lower surface.


any primitive bony fish of the family Acipenseridae, of temperate waters of the N hemisphere, having an elongated snout and rows of spines along the body: valued as a source of caviar and isinglass
References in periodicals archive ?
In addition to the sturgeon closure on the river, fishing for all species was banned for over five months when sturgeon might be present.
Some might say the Sturgeon Moon is aptly titled as the First Minister is a rising political star.
The shortnose sturgeon (Acipenser brevirostrum) is an amphidromous sturgeon reported to inhabit the continental slope of the Atlantic Ocean from New Brunswick, Canada, to Florida (Gruchy and Parker, 1980; Dadswell et al.
If Scotland is to have a real choice-when the terms of Brexit are known but before it is too late to choose our own course-then that choice must be offered between the autumn of next year, 2018, and the spring of 2019," Sturgeon told reporters, according to (http://uk.
The gorgeously illustrated document, which Sturgeon received when she was 7 years old, appears in retrospect to symbolize not just the momentous crossing but also the wind-tossed years that followed.
Commercial fishing rates for Atlantic sturgeon exceeded the fish's ability to replenish themselves in the late 1980s and early 1990s.
Sturgeon was quoted by The Scotsman newspaper as saying that if the referendum was called in June there might be too little time to convince voters in the rest of Britain that EU membership was the right choice.
Atlantic sturgeon are anadromous fish--spawning in the upper reaches of rivers, and inhabiting river systems and estuaries as juveniles before eventually moving offshore to spend most of their lives along the continental shelf of the Atlantic Ocean.
Sturgeon in the area are known for leaping and can grow up to 8ft long and weigh more than 14st.
Miss Sturgeon, who was seven months pregnant at the time, had known Miss Kelly for some time.
Kevin Sturgeon appeared in court after launching an unprovoked attack on a man who was with his wife on a bus in Coventry on New Year's Eve.
Procurement Purchasing Chicken Sturgeon as Specified in the Specifications.