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The current sea lamprey (Petromyzon marinus) mark classification system used for Great Lakes fishes was originally developed based on lake trout (Salvelinus namaycush) (King 1980). This scheme recognizes two basic types of sea lamprey marks (Types A and B) and four stages of mark healing (I-IV). Type-A marks indicate that the skin at the attachment site is broken, and the underlying musculature is exposed, whereas Type-B marks indicate that the skin is not broken. Stage I indicates that the parasite has recently detached and no healing has taken place, Stages II and III indicate intermediate stages of healing, and Stage IV represents complete healing. This classification system was recently revised by Ebener et al. (2006) for other Great Lakes fishes using images of sea lamprey marks on lake trout, lake whitefish (Coregonus clupeaformis), cisco (C. artedi), walleye (Sander vitreus), Chinook salmon (Oncorhynchus tshawytscha), and white sucker (Catostomus commersoni). The photographic illustrations in the King (1980) classification system were representative of idealized types and stages of sea lamprey marks. In contrast, the revised system by Ebener et al. (2006) also includes photographic illustrations of more complicated marks, such as multiple and sliding marks and photos of marks caused by agents other than sea lamprey, such as double-crested cormorants (Phalacrocorax auritus) or pathogens, which can be easily misinterpreted as sea lamprey marks. Although the Ebener et al. (2006) system will be beneficial for classifying sea lamprey marks on most Great Lakes fishes, this system may not be applicable for lake sturgeon (Acipenser fulvescens).