University of Vermont

J. Ellen Marsden

Marsden research

Current and Recent Research Projects

  • Spawning lake trout Lake Trout Restoration and Thiamine Deficiency
    Co-Investigators: Jacques Rinchard, SUNY Brockport; Allison Evans, OSU
    Graduate Student: Carrie Kozel
    The invasion of alewife in 2003 poses a new threat to lake trout and Atlantic salmon in Lake Champlain: alewife contain thiaminase, an enzyme that breaks down thiamine in their predators. Severe thiamine deficiency in hatchery fry causes physical and behavioral symptoms, and high mortality. We are examining whether early foraging in wild lake trout fry could restore thiamine.
  • Graduate student Tori Pinhiero Lake Trout Spawning Behavior
    Co-Principal Investigator: Jason Stockwell, UVM
    Graduate Student: Tori Pinhiero
    Working with Great Lakes colleagues, we are studying lake trout spawning: how they select mates, how behavior changes from daytime to nighttime, when spawning occurs, and whether sexes differ in their movement among spawning sites within and between years. We have established an acoustic telemetry array throughout Lake Champlain, and tagged 30 lake trout in 2013 to follow their movements year-round. We are also observing behavior on a single reef using a home-built remotely-operated vehicle.
    Project videos: Pre-spawning lake trout Oct 23 | Pre-spawning lake trout with lamprey | Clustered lake trout | Swarming lake trout, late afternoon Nov 6 | Swarming lake trout, early evening Nov 6
  • Thunder Bay researchers Habitat Restoration in Thunder Bay, Lake Huron
    Project Partners: DLZ Michigan, Michigan DNR, USFWS, NOAA Thunder Bay National Marine Sanctuary
    To remediate loss of critical lake trout spawning habitat we constructed 27 artificial reefs in Thunder Bay in 2010-2011. The reef design allows testing of factors (reef orientation, height, and size) that attract spawning lake trout and lake whitefish and maximizes egg and fry survival. We are conducting a five-year assessment of changes in reef shape, siltation, interstitial oxygen, colonization by dreissenids, egg deposition, and fry hatch. Learn more on the project website.
  • Graduate student Peter Euclide Habitat Fragmentation in Lake Champlain
    Graduate Student: Peter Euclide
    Since the early 1800s, Lake Champlain has been progressively fragmented by causeways that create virtually isolated bays. The effect of these divisions on fish movement is largely unstudied. The focus of this study is to examine genetic differentiation of several fish species in each bay, and estimate the walleye movements among basins from telemetry and mark-recapture data.
  • Yellowstone Lake Lake Trout Spawning in Yellowstone Lake
    Co-Investigators: Bob Gresswell, Chris Guy, USGS
    Graduate Student: Lee Simard
    Lake trout are an invasive species in Yellowstone Lake, and threaten the endemic population of cutthroat trout. Suppression efforts since 1994 have used gillnetting and commercial trap-net fishing to kill up to 300,000 lake trout annually. To assess feasibility to suppress early life stages, we are investigating where lake trout spawn, their hatching success, and factors that affect survival of eggs and fry.

Last modified January 08 2016 02:53 PM