Maine Dam Blamed for Fish Kills

Fish kills at the Union River dam often involve alewives, according to a letter released to the public by the National Marine Fisheries Service.

In a letter recently released to the public, the National Marine Fisheries Service called for Black Bear Hydro Partners to provide more data about fish kills as part of its application to renew its license to operate the Union River dam in Ellsworth, Maine, according to an article on

The letter states that, despite Black Bear’s efforts, “fish kill events continue to occur seasonally” at the dam, and that the kills often involve alewives, a species that is “an essential feature of listed critical habitat” for the endangered Atlantic salmon.

Read about a dam operator in Maine criticized for fish kills.