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The Shovelnose Sturgeon is buff or olive drab above and lighter below. It is covered by heavy plate-like scales and has a flattened snout and a long, threadlike filament attached to top lobe of tail fin (often missing). 4-8 pound fish are common.
Mississippi and Missouri Rivers, occasionally in larger tributaries.
Insect larvea, small mollusks and other bottom-dwelling organisms
12 pounds - Des Moines River, Van Buren County, April 1974 - Randy Hemm, Douds, Iowa
Most shovelnose sturgeon are caught accidentally by anglers fishing for catfish on the bottom.
This species is widely distributed in the Mississippi and Missouri Rivers and is occasionally collected in the larger tributaries of these rivers. Nowhere is it abundant, but it is considered common in many navigation pools of the Mississippi.
The shovelnose is buff or olive-drab above and light beneath. The entire body is armored with heavy plates. The snout is markedly flattened or shovel-shaped. There are no spiracles. There is a very long, thread-like filament attached to the top lobe of the tail fin, from whence the fish gets one of its common names -- "switchtail." This filament is very fragile and is often missing, especially in older individuals. This species commonly reaches a weight of 6 to 8 pounds, although 4 or 5 pound fish are more common. The state record is 12 pounds and was caught in the Des Moines River in Van Buren County.
The shovelnose is mostly a river fish, very seldom being found in the absence of a current. In the Mississippi River it frequents the tailwaters below wing dams and other structures which accelerate current flow.
Spawning occurs in May and June, with the spawning run being greatest during years of low flow. Little is known about the spawning activity of this species. Fish mature at 5 to 7 years of age when around 20 to 24 inches in length. Females do not spawn every year, and the larger specimens produce about 50,000 eggs. Growth in the Mississippi River is 8.4 inches FL at age I, 12.5 at age II, 16.1 at age III, 18.8 at age IV, 20.7 at V, 22.5 at VI, 23.8 at VII, 25.0 at VIII, 25.9 at IX, 26.7 at X, 27.1 at XI, and 27.4 at XII. Fish over 12 years of age are very rare.
The food habits of the shovelnose are similar to those of Lake Sturgeon. Mostly a bottom feeder, Shovelnose Sturgeon feed principally on insect larvae, small mollusks and other bottom organisms. Algae and bits of higher aquatic plants are also eaten, but ingestion is probably related to feeding on bottom organisms.
Shovelnose are the only sturgeon which can be legally taken in Iowa, and they are actively sought by commercial and sport fishermen. About 50,000 pounds are harvested each year by commercial fishermen from the Mississippi River.