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Toledo, Ohio & Lake Erie

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        Recent sampling in the Sandusky and Maumee rivers by various state agencies indicate grass carp populations are low, according to the Ohio Department of Natural Resources.

        Crews of fisheries biologists collected adult and juvenile carp June 12-14; 27 from the Sandusky River and three from the Maumee River.

        “Although present in the system, grass carp populations are considered to be low, and this week’s action reinforces this conclusion,” the ODNR said in a prepared statement.

        Crews from the ODNR Division of Wildlife worked with Michigan DNR; U.S. Fish and Wildlife Service; Department of Fisheries and Oceans Canada; Ontario Ministry of Natural Resources and Forestry; Minnesota DNR; Great Lakes Fishery Commission; The Nature Conservancy; U.S. Geological Survey; Quebec Ministry of Forest, Wildlife, and Parks; New York State Department of Environmental Conservation; Michigan State University; The Ohio State University, and the University of Toledo conducted the sampling, including the coordinated use of electro-fishing vessels and nets.

        The action is part of continuing efforts to remove invasive grass carp, assess grass carp capture techniques and increase information on grass carp populations in the rivers.

        This year’s project incorporated results from the 2017 coordinated response that tested grass carp collection strategies and the potential to control the species in the lake basin.

        This is one part of a structured effort to better understand and address grass carp in Lake Erie, the Ohio DNR said.

        The increased knowledge of grass carp in western Lake Erie gained through this research allows natural resource agencies, working through the Great Lakes Fishery Commission, to collaboratively develop science-based management approaches and evaluate the effectiveness of different actions and strategies.

        The grass carp is an invasive species in the Great Lakes region and is one of four species commonly identified as Asian carp.

        All species of Asian carp do not have the same negative ecological effects, according to the DNR. Grass carp present significantly different risks to the Lake Erie ecosystem compared to highly invasive bighead carp and silver carp.

        An adult grass carp commonly weighs more than 20 pounds and can grow up to 48 inches long. The fish are primarily herbivorous, consuming large quantities of aquatic vegetation, and affect fish communities primarily through habitat modification.

        Grass carp were actively stocked in private ponds in many states as early as the 1970s, and some have escaped.

        Grass carp have been detected in Lake Erie since the mid-1980s. Recent efforts to collect fish have resulted in low catch rates, indicating that fish are present in low densities. There is currently no evidence of negative ecological or economic impacts to the Lake Erie ecosystem attributed to grass carp.

 

 

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