Upstream Battle: Fishes Shun Modern Dam Passages, Contributing to Population Declines
A river study in the U.S. Northeast has found that many fish species are unable to use standard passageways to swim past dams on their spawning runs.
The link address is: http://www.scientificamerican.com/article.cfm?id=upstream-battle-fishes-shun-modern-dam-passages-population-declines
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