The fish is in serious trouble due to dams on the Lower Snake and Columbia Rivers
The Pacific Lamprey had seen drastic declines in population over the last few decades and is quickly becoming a rare sight. Last year it was estimated that only 30,000 crossed Bonneville Dam, down from 350 million to 400 million in the 60’s and 70’s.
via Plight of the Pacific lamprey: Is it a keeper?.
Seattle Times Newspaper