Least Tern (Sterna A. athalassos)

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Pallid Sturgeon (Scaphirhynchus alubus) Current Status: The pallid sturgeon has been listed as endangered both federally and in Colorado since 1980. The current population of this species is dangerously low. In fact, since 1970 there have been only 20 recorded sightings of this fish. The fish's decline is believed to be primarily due to the loss of habitat caused by man. Development of dams and other hydrological projects have limited current flows to a level that has had a negative effect on the sturgeon. Biology: The pallid sturgeon has the unfortunate distinction of being known as the "ugliest fish in North America." Anachronistic in appearance, the pallid sturgeon looks like a creature that should have been swimming the river bottoms seventy million years ago rather than today. The flattened shovel shaped snout, light brown dorsal surface, white underbelly, and long reptilian-like tail are distinctive characteristics of this unusual looking fish. Adding to the fish's dinosaur like appearance, are a series of bony plates that cover the outer surface of the fish. Mature pallid sturgeons range in length from 30 -60 inches, and can weigh 85 pounds. However, this growth occurs rather slowly, often encompassing the 80 -year life span of the fish. Small fish, crustaceans and worms are the main staple in the pallid's diet. Habitat: The pallid sturgeon is generally found along the Missouri- Mississippi River drainage system, this does include The Platte River. The species prefer side channels as well as main channels, as long as there is strong current flow and a sandy bottom. Historically, the sturgeon was found in river channels from Montana to St. Louis; and from St. Louis to the Gulf of Mexico. Recovery Effort: The pallid sturgeon's survival is dependent upon the availability of rivers with a sandy bottom and a strong current. Through efforts such as The Platte River Cooperative Agreement, the states of Colorado, Nebraska and Wyoming are encouraging the release of water from upstream dams and other water projects. The net effect of more water being released upstream, will be a stronger current through the Central Platte River (the lower Platte and Upper Missouri Rivers will also benefit in improved flow patterns). This will help sustain, and in some cases create, a habitat that is conducive to the recovery and survival of pallid sturgeon.