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Tag, You're It: Tracking the Grand Canyon's Toughest Fish

Season 2 Episode 5 | 4m 35s

Biologist Lindsay Hansen and her USGS team work day and night to study the federally threatened humpback chub in the Grand Canyon. Using PIT tags, they track fish growth and migration to understand how this resilient species adapts to cold dam flows and warming tributaries like the Little Colorado. Their efforts offer a glimpse of hope in an altered ecosystem.

Extras
Kenyan farmers and rangers balance danger and devotion in their fight to coexist with elephants.
Sara Fitzsimmons fights to resurrect a tree that once ruled the eastern U.S. forests.
Scientists fight to revive the northern white rhino — before it’s too late.
At La Brea Tar Pits, Emily Lindsey digs into Ice Age life beneath LA’s surface.
Deborah Giles and her dog Eba track whale poop to help save endangered orcas.
The Glen Canyon Dam promised water and power — but the river had other plans.
Aída Navarro joins the fight to revive the Colorado River Delta — and hope is flowing again.
Las Vegas defies the desert with epic engineering — but at what long-term cost?
Toxic dust, dead fish, and vanishing water — what happened to California’s inland sea?
Shane explores how beavers once ruled North America — and how they might again.
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