Blood Lake: Attack of the Killer Lampreys is a science fiction horror film directed by James Cullen Bressack and starring Shannen Doherty, Jason Brooks, Christopher Lloyd, Ciara Hanna, Fred Stoller, Rachel True, Jeremy Wade, and Zack Ward.
[1][2] Ted Jargenson, a city maintenance employee, is checking on a remote roadside pipe when he is attacked and killed by several hungry lampreys.
His body is found and brought to the morgue where lampreys burst from his chest cavity and kill the coroner, before they escape into the pipes and infiltrate the water system.
Cate and Nicole go to rescue young Kyle (who went to the beach earlier as lampreys begin attacking) while Alex goes to check on his own family.
They plan to shut down the main water system before the lampreys can escape into Lake Michigan and discover several dead throughout town including the mayor.
They resolve to use the bio salts from the dead lamprey's livers to lure the live ones to the main water plant where they can electrocute them.
As the town cleans up and Michael and his family leave, having seemingly solved the crisis, a lamprey attacks a member of the cleanup crew.