Van OS ten, John, and Hilary Jo Deason 



19380 The food of the lake trout ( Cristivomer namaycush namaycush ) 

 and of the lawjer ( Lota maculosa ) of Lake Michigan, '^rans. 

 Am, Fishc Soc^ VolT^ (1937), PPo 1^5-177, 



Analysis of stomach contents showing frequency of occur- 

 rence and estimated volume of various food items for the two 

 species according to size of fish and region of the lake 

 (southern, northern, and Green Bay), Lake trout and lawyers 

 (burbot) were found to be competitors for food and both were 

 predators on comraercially valuable coregonids. Competition was 

 indicated also between lawyers and coregonids for invertebrate 

 foods. 



1939o The age, growth, and feeding habits of the whitefish, 

 Core genus clupeaformis (Mitchill), of Lake Chajnplain, 

 Trans, Ajti, Fish, Soc, Vol, 68 (1938), pp, 1^2-162. 



Comparison of samples from, northern and southern areas 

 of the lake. The two areas were held to possess distinct popu- 

 lations because of separate spawning grounds and differences in 

 size and age composition, growt.h rate, and condition. Inverte- 

 brates made up 99,1 percent of the food in stomachs of southern 

 Lake Cham.plain whitefish; molluscs (principally amnicolids) ac- 

 coimted for 92,8 percent of the total food. 



Van Oosten, John, Hilary J. Deason, and Frank W. Jobes 



193h. A microprojection machine designed for the study of 

 fish scales. Jour, du Cons,, Vol. 9, pp. 2Ul-2l|8. 



Description, illustrated by cross-section drawing and 

 photograph, of optical equipment and general structural speci- 

 fications of machine specially adapted to scale work. 



Van Oosten, John, and Ralph Hile 



19U9„ Age and grow^•.h of the lake whitefish, Coregonus clupeafor - 

 mis (Mitchill), in Lake Erie. Trans, Am. Fish, Soc,, 

 Vol. 77 (i9h7), pp. 178-2l;9. 



Analysis of production statistics, l871-19li6, to bring 

 out long-term trends of yield and shifts in centers of production 

 and a general life-history study including consideration of fluc- 

 tuations in growth and the strength of year classes in relation to 

 environmental conditions, length-weight relationship (general re- 

 lationship, seasonal changes of. condition, loss of weight at 

 spawning), variation of sex ratio with age and by seasonj age 

 at maturity, and spawning season, 



-Uo- 



