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Tuesday, January 30 • 6:00pm - 9:00pm
Poster Display. Assessing Potential Silver Chub Spawning Locations in Lake Erie Using Otolith Microchemistry

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AUTHORS: Demetra Panos, US Geological Survey; Jorden McKenna, US Geological Survey; Anjanette Bowen, U.S. Fish & Wildlife Service; Patrick Kokovsky, US Geological Survey

ABSTRACT: Silver Chub (Machrybopsis storeriana), once an abundant species in Lake Erie, became nearly extirpated in the 1950s.  In the 1990’s they appeared to show signs of recovery but failed to reach their previous prolificacy in the Lake and are currently listed as endangered in Ontario and New York and as a species of special concern in Michigan.  Silver Chub is a riverine species throughout their native range and little is known about their spawning ecology in Lake Erie. Trawl data suggests spawning may occur in the Detroit and Maumee Rivers with possible discrete spawning groups.  To test this hypothesis, Silver Chub were collected during trawling operations in June, August, and September at the mouths of the Detroit and Maumee rivers and throughout the Western Basin of Lake Erie.  The otoliths of these specimens were extracted and examined for metal concentration using inductively coupled plasma mass spectrometry (ICP-MS). Microchemistries of the otoliths were analyzed using a discriminant function analysis to test for differences that would infer discrete spawning locations.  Understanding the spawning locations of Silver Chub enables managers to make more informed decisions on recovery plans and could result in the redefining of Silver Chub conservation status on Lake Erie.

Tuesday January 30, 2018 6:00pm - 9:00pm CST
Ballroom C & Foyer

Attendees (2)