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Salmon study: Dammed or not

A river with zero dams or a river with eight may not be much different for the survival of young salmon

By Susan Milius

- More than 2 years ago

There could be little difference in how young salmon survive their journey down a free-flowing river versus the heavily dammed Columbia River system, says a controversial new study.

ID TAG New acoustic tags small enough to surgically implant in young fish such as steelhead trout(above) and Chinook let researchers study the effects of dams and see how many juveniles survive their great journey from river tributaries out to sea.