The state fish, the walleye, is commonly found in all parts of Minnesota. The walleye fishing season begins on the second Saturday of May, the time of year when walleye begin spawning. Walleye are especially active on cloudy days and after sunset, as well as during the autumn, when walleye feed heavily to prepare for winter. They naturally reproduce in 260 lakes throughout the state, and are stocked in 1,300 other lakes by the Minnesota Department of Natural Resources. The lakes contain other sport fish such as smallmouth and largemouth bass, muskellunge, and northern pike, and streams in the southeast are populated by brook, brown, and rainbow trout.