From the University of Maine in the USA:
After more than a century, endangered shortnose sturgeon find historic habitat post dam removal
November 17, 2015
University of Maine researchers confirmed evidence that three female shortnose sturgeon were in the area between Veazie and Orono in mid-October. Researchers had previously implanted the sturgeon with small sound-emitting devices known as acoustic tags to see if they would use the newly accessible parts of the river.
Among the most primitive fish to inhabit the Penobscot, sturgeon are often called “living fossils” because they remain similar to their earliest fossil forms. Their long lives—more than 50 years—and bony-plated bodies also make them unique.
Historically, shortnose sturgeon and Atlantic sturgeon, a related…
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