But the longevity of the sturgeon in the Kootenai River is waning: It hasn't reproduced in real numbers in at least 30 years due to habitat change caused by Libby Dam, which shut its gates in 1975.

DESCRIPTION: Sturgeon have cartilaginous skeletons and a tube-like mouth. In the Kootenai River, they can grow to be larger than 200 pounds. They are gray in color. HABITAT: Kootenai River white ...

The white sturgeon of the San Francisco Estuary resembles ... politically driven orders to divert more water from the fish’s habitat have made environmental groups especially anxious.

The great white ... all five US Atlantic sturgeon population segments are endangered or threatened. The species’ top threats are entanglement in fishing gear, habitat degradation, habitat ...