Exposed to hormones, pharmaceuticals, and other chemicals, the beautiful wild fish in Canada’s Grand River has taken on some pretty odd characteristics—they’re turning into females. A long-term study suggests using bacteria to manage polluted water could turn the tide for feminized fish.

A native species, Etheostoma caeruleum, known as the rainbow darter, comes by its name honestly. Colorfully banded in shades of blue and red-orange, rainbow darters grow to about three inches and reach old age by five. Fond of clean headwater streams, darters are a sentinel species given their high… more

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