MICHIGAN (Cont. ) 



(1) association of immature forms with adults, (2) study of food habits and life 

 cycle of specific species, and (3) the role of the midge larvae in the turn over 

 of bottonn muds especially as related to radio active substances. 



U. S. Atomic Energy Comnnission cooperating; Central Michigan College, 

 began April 1955, indefinite; LaVerne L. Curry, Leader. 



Address inquiries to: LaVerne L. Curry, Box 55 Central Michigan College, 

 Mount Pleasant, Michigan. 



U. S. Fish and Wildlife Service, Branch of Fishery Biology 



1. Fluctuations, Interrelationships, and Movements of Fish Populations 



The objective of this project is to follow the fluctuations in the age, growth, 

 size, and abundance of the different species, commercial and non-commercial; 

 and to ascertain through marking experiments and morphological studies whether 

 local races and stocks exist, and the extent of movements and intermingling of 

 different segments of the populations. 



Wisconsin Conservation Department and the Michigan Department of 

 Conservation cooperating; Ann Arbur, Michigan, headquarters, Lakes Michi- 

 gan and Superior; began 1947, continuing; $18,000; Leonard S. Joeris, Leader; 

 reports available. 



Address inquiries to: James W. Moffett, Chief, Great Lakes Fishery In- 

 vestigations, P. O. Box 640, Ann Arbor, Michigan. 



2. Survey of Great Lakes Tributary Streams 



The objectives are to determine the location of all streams in the Superior, 

 Michigan, and Huron basins in which successful reproduction of the sea lamprey 

 can occur, and to determine the degree to which such streams are or may be 

 utilized by the species, to determine therefrom where control structures must 

 be located. 



Marquette and Ludington, Michigan; began May 1950, continuing; $25, 000; 

 Alberton L. McLain, William E. Gaylord, and Robert A. Bream, Leaders; 

 reports available. 



Address inquiries to: James W. Moffett, as in No. 1 above. 



3. The Growth, Abundance and Habits of Yellow Perch in Saginaw Bay, Lake 

 Huron 



The objectives are to learn changes in the perch population between the time 

 of an earlier 1929-1930 study and 1943-1955; and to study the extent and factors 

 of fluctuations in growth and year class strength. 



Saginaw Bay and Ann Arbor; began 1954, to close 1957; $7, 000; Salah 

 El-Zarka, Leader. 



Address inquiries to: James W. Moffett, as in No. 1 above. 



4. Development of Fish "Leading" or "Assembling" Devices 



The objective is to develop a device utilizing some form of pulsed direct 

 current which may be used as an accessory to the electro-mechanical weir and 

 trap to aid in the rapid transfer upstream of food and game fishes migrating with 

 the sea lampreys. 



Marquette, Michigan (Lake Superior streams); began 1951, continuing; 

 $9,000; Alberton L. McLain, Leader; reports available. 



Address inquiries to: James W. Moffett, as in No. 1 above. 



5. Chemical Control Techniques 



The objectives are to determine whether a specific toxicant exists which will 

 be lethal to larval lampreys but harmless to other aquatic life occupying the 



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