Brook trout have also been interbreeding with bull trout, spawning fertile hybrids between the two species. ... In 1998, bull trout were labeled as threatened under the Endangered Species Act.

Adding to the intrigue: Bull trout, brook trout and Mackinaw trout are actually not trout, but char. Warm Lake is one of the few places in Idaho that contains all three, and bull-brook hybrids are ...

The key identifier is the dorsal fin — if it has dark spots and markings, that usually means it’s a hybrid. Pure bull trout will have a plain dorsal fin.

In recent years, an informal bull trout benchmark of at least 178 bull trout spawning nests, ... and creating a hybrid, which is not desirable from the fishery managers' perspective.) ...

For many anglers, bull trout are a mystery. While they are common in a few remote streams, bull trout aren’t often found in popular fisheries. Fishing Column: Bull Trout 101: What anglers should ...

Federal officials are releasing a plan Thursday to recover struggling bull trout populations in five Western states with the goal of lifting Endangered Species Act protections for the fish.

When a bull trout reaches the Idaho-Montana border at Cabinet Gorge Dam, biologists at a new $2 million facility give it a quick DNA test, followed by a truck ride to the tributary stream of its ...

Hybrid Trout Threaten Montana's Native Cutthroats Climate change in the West is luring rainbow trout to higher elevations, where the fish are mating with native cutthroats, genetic evidence shows.

CABINET, Idaho – Like any immigration story, this one has a border with a big wall and a population that wants desperately to move from one side to the other.