MICHIGAN (Cont. ) 



lirrmological studies on plankton, nitrogen and phosphorus, and chemical 

 characteristics of bottom soils are made. 



Seven selected lakes in southern Michigan; began October 1952, continuing; 

 $4,669; Frank F. Hooper, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



32. Life History and Ecology of Stream Chironomids. 



The study aims to secure a better knowledge of the kinds and abiindance of 

 midges in trout streams, and to learn their habitat requirements and importance 

 as trout food. 



Hunt Creek, AuSable River, Pigeon River, Rifle River; began June 1952, 

 continuing; La Verne L. Curry, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



33. Lake and Pond Fertilization. 



The project aims to determine the practical value of commercial fertilizer 

 as a tool in warm-water fish production by experiments in lakes and ponds. 



South Twin Lake, Cheboygan County, Hatchery Ponds at Hastings and Wolf 

 Lake Hatcheries; began 1946, continuing; R. C. Ball, Leader; reports available. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



34. Increasing Productivity of Marl Lakes. 



Additions of organic matter and inorganic fertilizers are made to marl soils 

 to determine the factors limiting production of fish food organisms in marl lakes. 

 Methods of modifying marl lakes so as to increase their productivity are being 

 investigated. 



North Lake, Pintail Pond, Ogemaw County; Fish Lake, Barry County; began 

 June 1952, continuing; $2, 376; David L. Shull, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



35. Chennical Modification of a Soft-water Lake. 



Effort is being made to accomplish alkalization through addition of CaO and 

 CaC03. Evaluation of the changes is being made by chemical and biological in- 

 vestigation. 



Stoner Lake, Delta County; began 1952, continuing; R. C. Ball, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



36. Introduction of Redear Sunfish. 



Introductions into selected ponds are being made to test the value of the 

 species for farnn ponds. 



Ponds at Hastings and Wolf Lake Hatcheries; began 1949, continuing; $297; 

 R. C. Ball, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



37. Walleye Sport Fishery Management. 



Introductions of marked (or unmarked) fingerlings are made into selected 

 lakes to determine survival and value of maintenance plantings. 



About 10 lakes; began 1951, continuing; $297; Walter R. Crowe, Leader; 

 reports available. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



38. Walleye Sport Fishery, Muskegon River System. 



This study of the walleye fishery on the Muskegon River system is concerned 

 with the effectiveness of power dams as barriers, effect of turbines on walleyes 

 passing through them, fate of immature walleyes in Hardy Reservoir, possibility 



48 



