There are state hatcheries at Madison (for brook and rainbow trout), Bayfield (brook, rainbow and lake trout and whitefish), Oshkosh (lake trout, whitefish and wall-eyed pike), Minocqua (pike, bass and muskallonge), Delafield (black bass and wall-eyed pike) and Wild Rose (brook trout).
Salmon trout (Salvelinus namaycush, Walb.) and whitefish (Coregonus clupeiformis, Mitchill) are the most numerous and valuable.
McKinley Park on the lake shore south of the city, and Whitefish Bay 6 m.
The blue pike, whitefish and herring, obtained on Lake Erie are of;,;, considerable commercial importance.
The catch of herring was twice as much in 1908 as in 1907 and that of whitefish nearly four times as much in 1908 as in 1907; this increase was attributed to the work of the state hatcheries.