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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). 
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Tuesday, January 29 • 4:20pm - 4:40pm
(SYMPOSIA-07) Using a Simplified Approach to Analyzing Acoustic Telemetry Data and Identifying Sea Lamprey Spawning Areas in the St. Clair Detroit River System

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AUTHORS: Michael Lowe, Christopher Holbrook – USGS, Hammond Bay Biological Station; Darryl Hondorp, USGS Great Lakes Science Center; Aaron Jubar, USFWS Ludington Biological Station; Jessica Barber, USFWS Marquette Biological Station; Kevin Tallon, DFO Canada Sea Lamprey Control Centre

ABSTRACT: Despite continued monitoring and control efforts, the invasive Sea Lamprey (Petromyzon marinus) population in Lake Erie during 2009 was the highest in the time series and has since remained above target levels set by the Great Lakes Fishery Commission (GLFC).  It was hypothesized that Sea Lamprey production in the St. Clair and Detroit River system (SCDRS), which had undergone extensive restoration in recent years and was historically excluded from control efforts, has been under-estimated.  We present the results of a 2014 pilot study (n = 27 fish) and a larger study spanning 2016 (n = 125 fish) and 2017 (n = 125 fish) that used acoustic-tagged adult sea lamprey to identify potential spawning areas in the SCDRS.  In doing so, we introduce a new statistical method for summarizing and analyzing multidimensional fish movement data.  Our analysis of the 2014 pilot study data is congruent with a previous analysis of those same data using a more complex multinomial process model.  Both analyses show similar detection probabilities and behavioral aspects of sea lamprey movements, and ultimately reach the same conclusion: most Sea Lamprey spawning occurred in the lower half of the St. Clair River.  The 2016 and 2017 study, which had more fish and a more extensive array of acoustic receivers, further reduced the potential spawning area down to the middle St. Clair River between the mouth of the Belle River and Stag Island. The combined results of these studies address several needs identified by the GLFC and are expected to inform and guide alternative assessment and control strategies in the SCDRS.

Tuesday January 29, 2019 4:20pm - 4:40pm EST