Fish unable to pass through dams in U.S.

Dams create a largely impenetrable barrier for fish even when the dams were installed with specially-built passages, according to a new study in Conservation Letters. The scientists found that migrating fish largely failed to use the passages in the U.S., resulting in far fewer moving through the state-of-the-art hydroelectric dams than had been promised.

The scientists found that some fish—such as sturgeon—don't use the fish passageways at all. Others, such as American shad, have dwindled down to 2 percent of the conservation target on the Merrimack river system and zero percent on the other two rivers.


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That was interesting Ruth - thank you very much.

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