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A view of the Sierra Nevada from Fish Slough, where the last population of Owens pupfish were discovered by Phil Pister, Robert Miller, and Carl Hubbs in 1964.

Photo by Anders Halverson

A seasonal employee of the U.S. Forest Service removes a dead rainbow trout from a gillnet in a Sierra Nevada lake in the fall of 2006.

Photo by Anders Halverson

Biologist Roland Knapp examines invertebrates he has sampled from a Sierra lake in July, 2006. Knapp has been studying the effects of fish removal on other inhabitants of such lakes including amphibians and invertebrates like these.

Photo by Anders Halverson

The whirling disease parasite, Myxobolus cerebralis, forms small spores like this one, photographed with an electron microscope. The spores remain viable for dozens of years in the mud, until they are eaten by a small worm known as Tubifex tubifex. When the worms die, they release another phase of the parasite known as a triactinomyxon (TAM) that is ready to infect another fish and complete the life cycle.

Photo by Ronald P. Hedrick

A group at the University of Missouri is studying the effects of creatine--the same supplement used by athletes like home-run slugger Mark McGwire--on rainbow trout. Here the fish swims in a Plexiglas tube to measure its endurance. "Sportsmen would likely pay a premium for a fishing experience where the fish struck the bait harder and fought longer," said one of the researchers in a press release.

Photo by Steve Morse