You'd never suspect it on a whisper-still morning, with the mountains and marsh reflecting off the water, but Upper Klamath Lake in southern Oregon is a tough place to be a fish.
The shortnose and Lost River suckers provide a case in point. The two species of fish, which look like a big-lipped cross between a carp and cod, used to be common in this lake. For millennia, they were an important traditional food source for the local tribes. The federal government considers them endangered species.