Shovelnose Sturgeon

The shovelnose sturgeon (Scaphirhynchus platorynchus) is the smallest sturgeon species native to North America, endemic to the Mississippi and Missouri river drainages. A member of the family Acipenseridae, it is well adapted to fast, turbid river currents and is considered the most abundant sturgeon species on the continent. Unlike many larger sturgeon relatives, it completes its entire life cycle within freshwater rivers without migrating to the sea. Populations remain relatively stable in parts of its range, though habitat alteration from river channelization and impoundment has affected local abundance in some areas.

Shovelnose sturgeon show several distinguishing features:

• Small overall size, rarely exceeding 90 cm
• Flattened, wedge-shaped shovel snout
• A thin, whip-like filament extending from the upper lobe of the tail
• Extensive bony scute armor along the back and sides
• Underslung mouth with four barbels It is distinguished from the closely related pallid sturgeon by its smaller size, darker and more heavily pigmented body, and shorter barbels. Its slender, streamlined shape is well suited to holding position in the swift currents it typically inhabits.

Shovelnose sturgeon are found throughout the main channels and larger tributaries of the Mississippi and Missouri river systems, favoring fast-flowing, turbid water over sand or gravel substrate. They are well suited to the strong currents and shifting sediment typical of these large rivers and tend to avoid clear, slow-moving, or heavily impounded waters. The species remains widespread across much of its historic range within the central United States, benefiting from its tolerance of the turbid, current-swept conditions common in these waterways.

Shovelnose sturgeon forage along the riverbed for aquatic insect larvae and small invertebrates, using their barbels to locate prey in shifting sand and gravel. While they do not migrate to the sea, they undertake localized upstream movements within the river system to reach spawning grounds over gravel or rocky substrate in spring. They are solitary, bottom-oriented fish, and their tolerance of turbid, fast-flowing water allows them to remain common in habitats less suitable for other large river fish.