fingerlings in northern Lake Michigan 

 in 1944-1946. Includes analysis of 

 the data on the approximately 1,200 

 recoveries made through 1949 with 

 respect to movement from planting 

 locality, time out before recapture, 

 growth, ■ ■ ■ • Presents also informa- 

 tion on similar but smaller scale ex- 

 periments in Lakes Huron and Super- 

 ior, and on growth in Lake Michigan 

 as determined from scale studies of 

 samples from the commercial catch . 



1953. A modification in the technique of 

 computing average lengths from 

 the scales of fishes . Prog. Fish.- 

 Gult., Vol. 15, No. 2, pp. 85 86. 

 A demonstration that: estimates of 

 the length of fish at the end of differ- 

 ent years of life based on average 

 scale measurements differ insignif- 

 icantly from the averages of the 

 calculated lengths of individual fish; 

 the use of total lengths in growth cal- 

 culations yields essentially the same 

 results as are obtained when standard 

 lengths are calculated and subsequent- 

 ly converted to total lengths. 



1956. Tlie skin and scales . hv. The 

 physiology of fishes . Vol. 1. 

 Metabolism. (M. E. Brown, Ed.), 

 Academic Press, pp. 207-244. 

 The structure, chemical composition, 

 and functions of the skin of fishes and 

 of various types of scales (cosmoid, 

 ganoid, placoid, cycloid, and ctenoid) 

 are described. Sections are included 

 on: the variability in squamation; 

 structures formed by the modification 

 of scales and their function; use of 

 scales in classification and life -history 

 studies. 



1956. Lake sturgeon. Iik Our Endan- 

 gered Wildlife, Nat. Wildlife Fed., 

 pp. 9-10. 

 Slow growth (large fish may be 150 

 years old or older) and late maturity 

 (first spawning at about 20 years) 

 made the sturgeon highly susceptible 

 in the Great Lakes to the deliberate 

 destruction of the early years, the 



later overfishing, and more recently 

 to adverse changes of the environment. 

 Great Lakes stocks are so reduced 

 that extinction is threatened in some 

 areas. Problems of restoration are 

 difficult . 



Van Oosten, John, and Hilary J. Deason 



1938 . The food of the lake trout 

 (Cristivomer namaycush namaycusl^ 

 and of the lawyer (Lota maculosa) 

 of Lake Michigan. Trans. Am. 

 Fish. Soc, Vol. 67(1937), pp. 

 155-177. 



Analysis of stomach contents showing 

 frequency of occurrence and estimated 

 volume of various food items for the 

 two species according to size of fish 

 and region of the lake (southern, north- 

 ern, and Green Bay). Lake trout and 

 lawyers (burbot) were found to be com- 

 petitors for food and both were predators 

 on commercially valuable coregonids . 

 Competition was indicated also between 

 lawyers and coregonids for invertebrate 

 foods . 



1939. The age, growth, and feeding habits 

 of the whitefish, Coregonus clupea- 

 formi s (Mitchill), of Lake Ghamplain. 

 TransT Am. Fish. Soc, Vol. 68 

 (1938), pp. 152-162. 



Comparison of samples from northern 

 and southern areas of the lake. The 

 two areas were held to possess dis- 

 tinct populations because of separate 

 spawning grounds and differences in 

 size and age composition, growth rate, 

 and condition. Invertebrates made up 

 99.1 percent of the food in stomachs 

 of southern Lake Ghamplain whitefish; 

 molluscs (principally amnicolids) ac- 

 counted for 92 .8 percent of the total 

 food. 



1957. History of the Red Lakes fishery, 

 1917-1938, with observations on 

 population status. Fish and Wild- 

 life Serv., Spec. Sci. Rep. --Fish. 

 No. 229, pp. 1-63. 

 Historical account traces the develop- 

 ment of the commercial fishery from 

 its inception in 1917 through 1938. 



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