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NOAA FISH PASSAGE
In 2014, Maine began developing a fish elevator to carry American shad past Milford Dam. 12 years later, the system could reopen 600 miles of river habitat to a fish whose migration has been blocked for decades- In 1948, America built Mud Mountain Dam for flood control; decades later, a $112 million facility was designed to carry 1.2 million fish around it annually
- In 1979, old salmon cans were stored in an Alaskan cannery, and decades later, when scientists cracked them open, a rising worm count revealed something unexpected about changing ocean food webs
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