Environmental DNA surveys found higher diversity of clams and mud-dwelling species in populated Puget Sound.
Boaters are joining wildlife advocates, farmers and power companies to parcel out each cubic foot of Western rivers.
Some see the changes as reform of a troubled program, and others as an example of bureaucratic overreach.
A historic legal victory could give Alaska tribes more control over their fish, wildlife and homelands.
Concrete used to rebuild bridges on the Front Range appears to be the culprit for the deaths of 5,600 trout and other fish.
Invasive carp may recolonize areas they were once eradicated from, depending on how long the occupation lasts.
Some scientists are replacing sardines and anchovies with soybeans and corn as food for farmed fish.