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Tuesday, January 30 • 6:00pm - 9:00pm
Poster Display. Burbot (Lota lota) Movement and Age Distribution Within the St. Clair-Detroit River System

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AUTHORS: Stacey Ireland, USGS Great Lakes Science Center; James Boase, U.S. Fish & Wildlife Service; Dustin Bowser, USGS Great Lakes Science Center; Justin Chiotti, U.S. Fish & Wildlife Service; Robin L. DeBruyne, University of Toledo; Emily Galassini, USGS Great Lakes Science Center; Darryl Hondorp, USGS Great Lakes Science Center; Scott Jackson, USGS Great Lakes Science Center; Kevin Keeler, USGS Great Lakes Science Center; Edward F. Roseman, USGS Great Lakes Science Center; Todd Wills, Michigan Department of Natural Resources

ABSTRACT: In the Great Lakes, burbot (Lota lota) experienced a population collapse in the early-to-mid 1900s caused by negative consequences of invasive species, over-exploitation, and habitat degradation.  With the implementation of sea lamprey control programs and declines in alewife (Alosa pseudoharengus) abundance, many Great Lakes burbot populations are recovering.  Population assessments have been conducted in the Great Lakes, though information within connecting channels is scant.  Burbot in the St. Clair-Detroit River System (SCDRS), the connecting channel between lakes Huron and Erie, are showing signs of resurgence with collections of larvae, juveniles, and adults occurring in several different surveys conducted in various riverine habitats.  To better understand juvenile and adult burbot population demographics within the SCDRS, captured burbot were either (1) kept for gonad extraction and otolith age estimation or (2) were surgically implanted with acoustic telemetry tags and released back into the St. Clair River.  A total of 42 burbot (143-569 mm TL) had otoliths extracted, thin sectioned, mounted to slides, and ages estimated by counting alternating growth bands.  Ages of fish ranged from 1 to 4 years.  Nine adult burbot (333-477 mm TL) were released with an implanted acoustic telemetry tag in 2017.  To track movements, tag signals will be recorded on acoustic receivers that have been placed throughout the connecting channel as well as in lakes Huron, St. Clair, and Erie.  The population demographic and movement pattern information will improve our understanding of this ecologically important species.

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

Attendees (4)