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CONFERENCE SCHEDULE UPDATES & CHANGES: As a result of the prolonged government shutdown, we experienced a number of cancellations and changes to the schedule. Cancellations and changes are listed here (as of January 26, 2019). 

Monday, January 28 • 2:00pm - 2:20pm
(SYMPOSIA-03) Determine What Fishes Adult Sea Lamprey Parasitized by Barcoding DNA in Their Feces

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AUTHORS: Nicholas Johnson, U.S. Geological Survey, Great Lakes Science Center; Chris Merkes, Joel Putnam – U.S. Geological Survey, Upper Midwest Environmental Sciences Center

ABSTRACT: Sea lamprey are controlled in the Great Lakes to reduce damage to valuable fisheries. Sea lamprey control is effective, but damage caused by remaining sea lamprey is poorly defined because because sea lamprey feed on blood and traditional gut content analysis has not possible.  Here, we test the concept that sea lamprey diet can be quantified by barcoding DNA in sea lamprey feces.  Specifically, we determined the percentage of fecal samples containing measureable DNA from host fishes when collected from (1) recently fed parasitic sea lamprey, (2) fasted parasitic sea lamprey transitioning to the adult stage, and (3) adult sea lamprey captured from a spawning stream.   If successful, the method could help managers better interpret lake trout wounding rates by providing insight as to how often hosts alternative to lake trout are targeted by sea lamprey. Ultimately, our vision is that adult sea lamprey assessment in each Great Lake may be able to produce an annual estimate of abundance and an estimate what fishes that cohort of adult sea lamprey were feeding on, so that fish managers could estimate damage caused to specific fish stocks.

Monday January 28, 2019 2:00pm - 2:20pm
HOPE BALLROOM C

Attendees (12)