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Spring Ruffe Reduction Efforts Initiated in Thunder Bay River, Lake Huron
Midwest Region, April 12, 2005
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Alpena Fishery Resources Office staff began removal efforts for spawning phase adult Eurasian ruffe in the Thunder Bay River in Alpena, Mich., on April 12, 2005. Ruffe are an aquatic nuisance fish species that are thought to compete with native species for food and habitat resources. Ruffe were first discovered in the Thunder Bay River in 1995 and it remains the only location where ruffe have been found within the lake. They spawn in the spring at water temperaturs 5-18 C. Spawning phase ruffe have been captured from the Thunder Bay River in past years.

The reduction effort was initiated in 2002 and has been conducted annually. Small mesh gillnets are used to remove adult spawning phase ruffe prior to release of sex products. Approximately 100 spawning phase ruffe were captured and removed in 2002 and a fraction of that number in 2003. No ruffe were captured in 2004 and efforts in 2005 will help identify if ruffe are continuing to spawn and persist in the Thunder Bay area.

Contact Info: Midwest Region Public Affairs, 612-713-5313, charles_traxler@fws.gov



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