MICHIGAN (Cont. ) 



32. Periodicity of Fish Growth. 



By analysis of scale samples collected throughout the year fromfish in four lakes, 

 the investigation seeks to determine time of year during which fish grow and the 

 percentage of growth in the various months of the growing season. 



Four Michigan lakes; began in 1946, to be completed in 1953; $1,566; J. E. Williams, 



Proj. L,dr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museunns 



Annex, Ann Arbor, Mich. 



33. Cycles in Growth Rate of Fish. 



The project is set up to determine if natural cycles in rate of growth of game and 

 pan fish occur in Michigan lakes; to compare growth rates of fish from lakes 

 known to have slow growing fish 10 years ago with fish known to have had good 

 growth 10 years ago; to make yearly scale sample collections from experimental 

 lakes for growth comparisons. 



Eighteen lakes throughout the State; began in 1947, to be completed in 1954; $1, 566; 



J. E. Williams, Proj. Ldr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



34. Food of Brook and Brown Trout inPigeon River. 



Collection of all stomachs from trout caught by anglers is the basis for determining 

 correlation between volunne of stomach contents and growth rate of trout; also 

 the correlation of stomach contents with seasonal changes in condition and growth 

 rate. 



Pigeon River; began September 1952, completed December 1952; $928; E. L. Cooper 



and N. G. Benson, Proj. Ldrs. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



35. Availability of Fish Food Organisms in Selected Southern Michigan Lakes. 



Year around quantitative and qualitative samples of fish food organisms are taken 

 from selected warm water lakes in Michigan to determine the the factors which 

 influence the availability and utilization of fish food organisms. Also, limnological 

 studies on plankton, nitrogen and phosphorus, and chemical characteristics of 

 bottom soils are made. 



Seven selected lakes in southern Michigan; began October 1952, indefinite; $4, 669; 



Frank F. Hooper, Proj. Ldr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



36. Life History and Ecology of Stream Chironomids. 



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

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

 trout food. 



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