Minnesota Public Radio slideshow:
The decline and fall of the Mississippi
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Researchers from the DNR walk a cage containing fish implanted with tiny mussel larvae into Lake Pepin. It's part of a plan to regenerate the Mississippi's mussel population. Virtually all of the mussels were killed by pollution in the mid-1900s. (MPR Photo/Erin Galbally)

Researchers from the DNR walk a cage containing fish implanted with tiny mussel larvae into Lake Pepin. It's part of a plan to regenerate the Mississippi's mussel population. Virtually all of the mussels were killed by pollution in the mid-1900s.

(MPR Photo/Erin Galbally)
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