Yangtze dams put endangered sturgeon's future in doubt

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Before the damming of the Yangtze River in 1981, Chinese sturgeon swam freely each summer one after another into the river's mouth, continuing upriver while fasting all along the way. They bred in the upper spawning ground the following fall before returning quickly back to the sea. Now, researchers offer new insight into the threat the dams have since posed to the critically endangered fish.

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