|Fishing Info: Boysen Reservoir contains a diverse fishery. Anglers will discover walleye, sauger, perch, crappie, ling, rainbow, cutthroat and brown trout as the major sports species. Other game fish present are largemouth bass, bluegill, stonecat, black bullhead, mountain whitefish, lake trout, brook trout and splake. Non-game species include carp, fathead minnow, plains killifish, golden and sand shiners; flathead, lake and creek chubs; white, longnose and northern redhorse suckers; and the river carpsucker. recently Boysen holds the state record on three types of fish; the walleye at 17.42 lbs, the black crappie at 2.34 lbs and the carp sucker at 6.15 lbs. The walleye is also a world record through the ice.