MICHIGAN (Cont. ) 



5. The Degree of Correlation Between the Material in Stomach Samples, in Cut- 

 throat and Rainbow Trout, and the Lure Upon Which the Fish Were Taken 



This project is an attempt to test the correlation between the lure, as to 

 size, shape, color, and method of fishing, and the animal life contained in 

 stomach samples, as to size, shape, color, and habits, in cutthroat and rain- 

 bow trout. The material was gathered in the Cooke City area in Montana at the 

 northeast entrance of Yellowstone National Park. 



Park County, Montana; began June 1956, to close June 195 7; Kenneth 

 Cumnnins, Leader. 



Address inquiries to: Kenneth Cummins, Department of Fisheries, Uni- 

 versity of Michigan, Ann Arbor, Michigan. 



6. The Age and Food Habits of the Smelt, (Osmerus mordax) 



The objective is to evaluate the age and food habits of the smelt in Saginaw 

 Bay during the months June, July, August, and September 1956. 



U. S. Fish and Wildlife Service cooperating; began Jvme 1956, to close May 

 1957; William G. Gordon, Leader. 



Address inquiries to: William G. Gordon, Department of Fisheries, 

 School of Natural Resources, University of Michigan, Ann Arbor, Michigan. 



7. Validity of Age Determination from Scales, and Growth of Marked Lake Michigan 

 Lake Trout 



The objectives are to ascertain whether any repetative markings on the 

 scales of lake trout could be linked with the known age of fin-clipped fish, to 

 establish the time of annulus formation, and to follow the development of 

 marginal growth on the scales. Growth of the fish was also studied. 



Conservation Departments of Michigan and Wisconsin cooperating; Ann 

 Arbor; began July 1951, closed November 1956; Louella E. Cable, Leader; re- 

 ports available. 



Address inquiries to: Louella E. Cable, 1220 East Washington St. , Ann 

 Arbor, Michigan. 



8. The Temperature Sensitivity of Some American Freshwater Fish 



The objectives are to test the acuity of perception of fish to temperature 

 changes, and to make a preliminary determination of the mechanism by which 

 fish sense small temperature changes. 



Horace H. Rackham School of Graduate Studies cooperating; University 

 of Michigan; began January 1955, closed June 1956; reports available. 



Address inquiries to: John E. Bardach or Richard G. Bjorklund, Depart- 

 ment of Fisheries, School of Natural Resources, University of Michigan, 

 Ann Arbor, Michigan. 



9. The Effect of Light, Thyroid and Antithyroid Substances on Normal Growth, 

 Regeneration of Fins and Scales, and Gonad Maturation in the Goldfish 



The objectives are: (1) To evaluate the role of the photoperiod in growth 

 and maturation of fish, and (2) to determine the effect of thyroid and antithyroid 

 substances on maturation, growth, and metabolism of fish with a view to de- 

 termining thyroid function in teleosts. 



Horace H. Rackham School of Graduate Studies cooperating; University of 

 Michigan; began July 1955, to close June 1957; R. G. Bjorklund, Leader. 



Address inquiries to: R. G. Bjorklund, as in No. 8 above. 



10. Biology of Chubs of Lake Michigan 



The objectives are to learn basic facts of life history and distribution and 

 to relate these to rise of sea lamprey population. 



U. S. Fish and Wildlife Service cooperating; Ann Arbor, Michigan; began 



64 



