Caption: UW-Madison junior Ashley Gramza checks one of 200 crayfish traps set on Sparkling Lake in Vilas County, Wisconsin, while senior Nicole Hayes steadies the boat. An intensive program of trapping and manipulation of fishing regulations to increase the number of fish that prey on small crayfish may be the key to ridding Wisconsin lakes of the rusty crayfish, an invasive species that has set up shop in half of Wisconsin lakes and streams causing severe ecological degradation.
Photo by: Kurt Krueger (freelance for UW-Madison)
Date: July 2006
300 DPI JPEG

Caption: A group of rusty crayfish are displayed in a bucket after being trapped in Sparkling Lake. At the onset of the National Science Foundation-funded study five years ago, UW-Madison scientists and their students were extracting thousands of the invasive crustaceans from the 110-acre lake in Vilas County, Wisconsin. The population of the crayfish has been reduced significantly, suggesting it may be possible to devise similar strategies to rid other Wisconsin lakes of the crayfish that overpowers native species, destroys fish habitat and eats fish eggs.
Photo by: Kurt Krueger (freelance for UW-Madison)
Date: July 2006
300 DPI JPEG

Caption: A male rusty crayfish, or Orconectes rusticus, found in Sparking Lake in northern Wisconsin. Rusty crayfish are an invasive species now found in lakes and streams across the United States.
Photo by: Brian Roth
Date: July 2004
200 DPI JPEG