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U.S. Geological Survey - Great Lakes Science Center

GLSC completes annual collaborative Lake Huron acoustic survey

The GLSC and the US Fish and Wildlife Service completed an inter-agency acoustic-midwater trawl survey of Lake Huron during September 6-29, 2017. This survey is completed annually to assess pelagic fish stocks in the three basins of Lake Huron: North Channel, main basin, and Georgian Bay. Remote sensing data from this survey (480 km of acoustic transects) will be integrated with mid-water trawl catch data to estimate density and biomass of species including rainbow smelt (Osmerus mordax), Coregonus species such as bloater, and other important prey fish that occupy the offshore zones. In addition to fish sampling, zooplankton, Mysis, and chlorophyll a samples were also collected to monitor lower trophic-level production. This survey provides fishery managers with current information on prey fish levels available to support higher-level predators. Additionally, the large areal extent of this survey provides a better understanding of spatial variability in fish biomass throughout Lake Huron. (Timothy O’Brien, tiobrien@usgs.gov)

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