View Related Episode: Radio Fish/Salmon, Warner Sucker, Fish Replicas
Salmon in the Willamette River are counted visually as they pass Willamette Falls on their way upstream to their spawning grounds. Scientists find that forty percent of those salmon don't make it all the way upstream. To find out why, they attach radio transmitters to a sampling of the salmon.
First Broadcast: 1992
Producer: Eric Cain
Appeared in episode: Radio Fish/Salmon, Warner Sucker, Fish Replicas
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