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The newest addition to the fishing scene in the recreation area is the northern pike , first noted in Red Shirt Lake in 1980 . About 20 percent of anglers were seeking northern pike , with the same percentage seeking walleye . A quarter century of research , however , has revealed that garfish pose little threat to gamefish populations ( i.e ., bass , pike , walleye , trout , sunfish , and catfish ) . In some areas of the United States , freshwater fish ( eg , walleye , pike , muskie , and bass ) may contain elevated concentrations of mercury as well . A curious case has been given by Prof. Mobius , * of a pike , separated by a plate of glass from an adjoining aquarium stocked with fish , and who often dashed himself with such violence against the glass in trying to catch the other fishes , that he was sometimes completely stunned .