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Rainbow Trout
Photo: Rainbow trout
WALLPAPER
Rainbow trout inhabit the cool freshwater habitats of western North America. Individuals who migrate to the sea lose their distinctive pink streak for a silver look.
Photograph by Ken Hammond, USDA
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Fish Features
Photo: American bullfrog

Wild Rivers

Visit the rivers and streams of the southeastern U.S., home to some of the most species-rich freshwater systems on Earth, in this Wild World feature.

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Photo: Greenland shark

Photo of the Day: Cold Fish

Get a rare glimpse of the elusive Greenland shark, largest of all Arctic fish.

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Photo: Columbia salmon

River Dammed

Salmon populations in the Columbia River are in steep decline. Get the scoop, plus maps, vivid photos, and more in this feature.

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Photo: Atlantic salmon

Atlantic Salmon

Find out why dwindling wild salmon numbers are turning this once abundant fish into "chickens of the sea" in this feature.

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