Caption: Microscopic view of Bythotrephes cederstroemi, or spiny water flea. Approximately 0.5 inches in length, with its barbed tail making up half its body length, the water flea is an invasive species that was recently found in a northern Wisconsin lake by Pieter Johnson at the Center for Limnology.
Photo by: Pieter Johnson, Center for Limnology
Date: September, 2003
High-resolution 300 DPI JPEG

Caption:Microscopic view of Bythotrephes cederstroemi, or spiny water flea. Approximately 0.5 inches in length, with its barbed tail making up half its body length, the water flea is an invasive species that was recently found in a northern Wisconsin lake by Pieter Johnson at the Center for Limnology.
Photo by: Pieter Johnson, Center for Limnology
Date: September, 2003
High-resolution 300 DPI JPEG