WISCONSIN (Cont. ) 



Bayfield Hatchery and western Lake Superior; began 1949, indefinite; 

 $25, 000; Russell I. Daly, Clarence A. Wistrom, Willard Sieh, Leaders; reports 

 available. 



Address inquiries to: Conservation Department, as in No. 1 above. 



3. Effects of Angling Restrictions on Available Fish Stocks of Warm-water Fishes 

 in Lakes. 



Population estimates and creel census have permitted some estimates of 

 exploitation of game fishes under known levels of fishing pressure on five lakes 

 in Vilas County, which have been open to year-round fishing with no size limits 

 and no bag limits imposed. Principal game fish present include yellow walleyes, 

 smallmouth bass, yellow perch, rock bass, northern pike, muskellunge and 

 largemouth bass. Fishing is allowed by free permit only with accurate creel 

 census possible. 



Vilas County; began 1946, indefinite; $6, 000; John H. Klingbiel and Arthur A. 

 Oehmcke, Leaders; reports available. 



Address inquiries to: Conservation Department, Area II Headquarters, 

 Woodruff, Wis. 



4. Experimental Management of Lake Eau Claire. 



Lake Eau Claire, an 1, 800-acre impoundment on the Eau Claire River, is 

 being managed for warm-water species of sport fishes. The lake was drained 

 with cooperation and financial assistance from county authorities to control carp 

 populations and to remove stumps and debris from selected areas. These se- 

 lected areas will be used in future carp seining operations. Management plans 

 are based on biological inventories of fish populations present with review by 

 local interested agencies. 



Eau Claire County cooperating; Eau Claire County; began 1953, to close 1956; 

 $6,500; John Brasch, Lyle Christenson, Leroy Small, Leaders. 



Address inquiries to: Conservation Department, Area III Headquarters, 

 Black River Falls, Wis. 



5. Study of Lake Sturgeon Fishery in Fox River Watershed. 



Population estimates are being made by a mark-and-recovery method. An 

 estimate of the catch is obtained by a one-dollar tag required for each sturgeon 

 caught. This makes possible an estimate of the rate of exploitation upon which 

 to base proper regulation of the fishery. The age-composition of the catch is 

 being determined by an analysis of pectoral fin bone sections. Gonads are 

 being examined to determine time at first maturity and the reproductive potential. 



Lakes Winnebago, Butte des Morts, Poygan, and Fox and Wolf Rivers; began 

 1953, to close 1958; $7,000; Robert T. Probst, Leader; reports available. 



Address inquiries to: Conservation Department, Area IV Headquarters, 

 Oshkosh, Wis. 



6. Fish Ecology Studies, With Special Reference to Sheepshead, White Bass, and 

 Yellow Walleye. 



A program of removal of sheepshead from Lake Winnebago is ainned at re- 

 ducing competition for the more favored sport fishes such as yellow walleye and 

 white bass. The present study will evaluate the results of this removal program 

 by an anlysis of the fishery statistics, growth and mortality rates of the sheeps- 

 head populations and accompanying changes in populations of yellow walleye and 

 white bass. 



Lake Winnebago; began 1953, to close 1958; $7,000; Thomas L. Wirth and 

 Richard F. Harris, Leaders. 



Address inquiries to: Conservation Department, as in No. 5 above. 



129 



