Monster Seminar JAM - Something About Lampreys: Conservation of an Oft Maligned Fish
Dr. Mary Moser, Northwest Fisheries Science Center
Lamprey suffer from the negative public image that is reserved for most parasites. However, declines in lamprey populations (and the fisheries they support) have fueled new interest in lamprey conservation and resulted in a 2003 petition to list four lamprey species in the Pacific Northwest. Pacific lamprey, Lampetra tridentata, embark on the same heroic spawning migrations that inspire awe among salmon enthusiasts. In the Columbia River drainage they historically migrated hundreds of kilometers to spawning areas upstream of the now impassable Chief Joseph and Hells Canyon dams on the Columbia and Snake rivers. Using radio transmitters, spawning migrations of adult lamprey through the Columbia River hydropower corridor were tracked in 1997-2002. Results indicated that lamprey delay at lower Columbia River dams and exhibit poor passage efficiency relative to salmonids. Interestingly, factors that are correlated with delay in salmon (e.g., flow and spill levels) did not affect lamprey in the same way. Some features of the fishways, which were designed for salmonid passage, are obstacles to adult lamprey. Work is underway at Bonneville Dam to aid lamprey passage by developing lamprey-friendly fishway designs. In the future, lamprey-specific fishways may be needed to improve lamprey passage at particularly difficult obstacles to passage.
University of Washington
The Old Fisheries Center Auditorium (rm 201)
Date and Time:
January 4, 2007,
11:00 am - 12:30 pm