Fish
Pallid Sturgeon
Scaphirhynchus albus · also called pallid sturgeons
A pallid sturgeon patrols the murky bottom of the Missouri River, probing the sediment with its shovel-shaped snout, a fish that may not be ready to reproduce for another decade or more, in a river system reshaped by dams before it ever had the chance.
Overview
The pallid sturgeon, Scaphirhynchus albus, is a large, long-lived, federally endangered fish native to the Missouri and Mississippi River drainages of the central United States. Its extraordinarily slow path to reproduction, decades-long lifespan, and severe loss of braided sandbar habitat to dam construction make it one of the most genuinely imperiled fish in North America.
A slow life in a fast-changing river
Built for patience over a lifespan that can stretch past fifty years, the pallid sturgeon has found its ancient, methodical strategy poorly matched to a river system transformed by dams within just a few human generations.
Status
Endangered — severely declined due to dam construction and channelization eliminating the braided sandbar habitat the species depends on.
Pallid Sturgeon: common questions
Why does the pallid sturgeon take so long to reproduce?
This species may not reach sexual maturity until 15 to 20 years of age, and even after maturing, females may only spawn once every several years, an extraordinarily slow reproductive pace that makes population recovery from decline a very gradual process compared with faster-breeding fish.
What habitat did dam construction take away from the pallid sturgeon?
Dam construction and channelization of the Missouri and Mississippi Rivers eliminated much of the shifting, braided sandbar habitat this species depends on for feeding and spawning, replacing a dynamic, ever-changing river system with a more controlled, uniform channel poorly suited to the sturgeon's needs.
How long can a pallid sturgeon live?
This species can live for over 50 years, an unusually long lifespan for a fish, though combined with its slow path to sexual maturity, this longevity means a struggling population can take an especially long time to recover even under improved conditions.
What does a pallid sturgeon's snout help it do?
Its distinctively flattened, shovel-shaped snout is adapted for probing soft river-bottom sediment, working together with sensitive barbels to detect small fish and invertebrates buried or hidden in the turbid water of large rivers.